3.26.1 html 819 533 1 true 127 0 false 4 false false R1.htm 000 - Document - Document And Entity Information Sheet http://www.syb.com/20260331/role/statement-document-and-entity-information Document And Entity Information Cover 1 false false R2.htm 001 - Statement - Condensed Consolidated Balance Sheets (Current Period Unaudited) Sheet http://www.syb.com/20260331/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited Condensed Consolidated Balance Sheets (Current Period Unaudited) Statements 2 false false R3.htm 002 - Statement - Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) Sheet http://www.syb.com/20260331/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited-parentheticals Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) Statements 3 false false R4.htm 003 - Statement - Condensed Consolidated Statements of Income (Unaudited) Sheet http://www.syb.com/20260331/role/statement-condensed-consolidated-statements-of-income-unaudited Condensed Consolidated Statements of Income (Unaudited) Statements 4 false false R5.htm 004 - Statement - Condensed Consolidated Statements of Comprehensive Income (Unaudited) Sheet http://www.syb.com/20260331/role/statement-condensed-consolidated-statements-of-comprehensive-income-unaudited Condensed Consolidated Statements of Comprehensive Income (Unaudited) Statements 5 false false R6.htm 005 - Statement - Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) Sheet http://www.syb.com/20260331/role/statement-condensed-consolidated-statements-of-changes-in-stockholders-equity-unaudited Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) Statements 6 false false R7.htm 006 - Statement - Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) Sheet http://www.syb.com/20260331/role/statement-condensed-consolidated-statements-of-changes-in-stockholders-equity-unaudited-parentheticals Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) Statements 7 false false R8.htm 007 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited) Sheet http://www.syb.com/20260331/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited Condensed Consolidated Statements of Cash Flows (Unaudited) Statements 8 false false R9.htm 008 - Disclosure - Note 1 - Summary of Significant Accounting Policies Sheet http://www.syb.com/20260331/role/statement-note-1-summary-of-significant-accounting-policies Note 1 - Summary of Significant Accounting Policies Notes 9 false false R10.htm 009 - Disclosure - Note 2 - Investment Securities Sheet http://www.syb.com/20260331/role/statement-note-2-investment-securities Note 2 - Investment Securities Notes 10 false false R11.htm 010 - Disclosure - Note 3 - Loans and Allowance for Credit Losses on Loans Sheet http://www.syb.com/20260331/role/statement-note-3-loans-and-allowance-for-credit-losses-on-loans Note 3 - Loans and Allowance for Credit Losses on Loans Notes 11 false false R12.htm 011 - Disclosure - Note 4 - Goodwill Sheet http://www.syb.com/20260331/role/statement-note-4-goodwill Note 4 - Goodwill Notes 12 false false R13.htm 012 - Disclosure - Note 5 - Core Deposit and Customer List Intangible Assets Sheet http://www.syb.com/20260331/role/statement-note-5-core-deposit-and-customer-list-intangible-assets Note 5 - Core Deposit and Customer List Intangible Assets Notes 13 false false R14.htm 013 - Disclosure - Note 6 - Other Assets Sheet http://www.syb.com/20260331/role/statement-note-6-other-assets- Note 6 - Other Assets Notes 14 false false R15.htm 014 - Disclosure - Note 7 - Income Taxes Sheet http://www.syb.com/20260331/role/statement-note-7-income-taxes Note 7 - Income Taxes Notes 15 false false R16.htm 015 - Disclosure - Note 8 - Deposits Sheet http://www.syb.com/20260331/role/statement-note-8-deposits Note 8 - Deposits Notes 16 false false R17.htm 016 - Disclosure - Note 9 - Securities Sold Under Agreements to Repurchase Sheet http://www.syb.com/20260331/role/statement-note-9-securities-sold-under-agreements-to-repurchase Note 9 - Securities Sold Under Agreements to Repurchase Notes 17 false false R18.htm 017 - Disclosure - Note 10 - Subordinated Debentures Sheet http://www.syb.com/20260331/role/statement-note-10-subordinated-debentures Note 10 - Subordinated Debentures Notes 18 false false R19.htm 018 - Disclosure - Note 11 - FHLB Advances and Other Borrowings Sheet http://www.syb.com/20260331/role/statement-note-11-fhlb-advances-and-other-borrowings Note 11 - FHLB Advances and Other Borrowings Notes 19 false false R20.htm 019 - Disclosure - Note 12 - Commitments and Contingent Liabilities Sheet http://www.syb.com/20260331/role/statement-note-12-commitments-and-contingent-liabilities Note 12 - Commitments and Contingent Liabilities Notes 20 false false R21.htm 020 - Disclosure - Note 13 - Assets and Liabilities Measured and Reported at Fair Value Sheet http://www.syb.com/20260331/role/statement-note-13-assets-and-liabilities-measured-and-reported-at-fair-value- Note 13 - Assets and Liabilities Measured and Reported at Fair Value Notes 21 false false R22.htm 021 - Disclosure - Note 14 - Disclosure of Financial Instruments Not Reported at Fair Value Sheet http://www.syb.com/20260331/role/statement-note-14-disclosure-of-financial-instruments-not-reported-at-fair-value- Note 14 - Disclosure of Financial Instruments Not Reported at Fair Value Notes 22 false false R23.htm 022 - Disclosure - Note 15 - Mortgage Banking Activities Sheet http://www.syb.com/20260331/role/statement-note-15-mortgage-banking-activities- Note 15 - Mortgage Banking Activities Notes 23 false false R24.htm 023 - Disclosure - Note 16 - Accumulated Other Comprehensive Income (Loss) Sheet http://www.syb.com/20260331/role/statement-note-16-accumulated-other-comprehensive-income-loss Note 16 - Accumulated Other Comprehensive Income (Loss) Notes 24 false false R25.htm 024 - Disclosure - Note 17 - Preferred Stock Sheet http://www.syb.com/20260331/role/statement-note-17-preferred-stock Note 17 - Preferred Stock Notes 25 false false R26.htm 025 - Disclosure - Note 18 - Net Income Per Share Sheet http://www.syb.com/20260331/role/statement-note-18-net-income-per-share Note 18 - Net Income Per Share Notes 26 false false R27.htm 026 - Disclosure - Note 19 - Stock-based Compensation Sheet http://www.syb.com/20260331/role/statement-note-19-stockbased-compensation- Note 19 - Stock-based Compensation Notes 27 false false R28.htm 027 - Disclosure - Note 20 - Derivative Financial Instruments Sheet http://www.syb.com/20260331/role/statement-note-20-derivative-financial-instruments- Note 20 - Derivative Financial Instruments Notes 28 false false R29.htm 028 - Disclosure - Note 21 - Regulatory Matters Sheet http://www.syb.com/20260331/role/statement-note-21-regulatory-matters Note 21 - Regulatory Matters Notes 29 false false R30.htm 029 - Disclosure - Note 22 - Segments Sheet http://www.syb.com/20260331/role/statement-note-22-segments- Note 22 - Segments Notes 30 false false R31.htm 030 - Disclosure - Note 23 - Revenue From Contracts With Customers Sheet http://www.syb.com/20260331/role/statement-note-23-revenue-from-contracts-with-customers- Note 23 - Revenue From Contracts With Customers Notes 31 false false R32.htm 031 - Disclosure - Note 24 - Leases Sheet http://www.syb.com/20260331/role/statement-note-24-leases Note 24 - Leases Notes 32 false false R33.htm 032 - Disclosure - Note 25 - Subsequent Event Sheet http://www.syb.com/20260331/role/statement-note-25-subsequent-event Note 25 - Subsequent Event Notes 33 false false R34.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 34 false false R35.htm 995445 - Disclosure - Significant Accounting Policies (Policies) Sheet http://www.syb.com/20260331/role/statement-significant-accounting-policies-policies Significant Accounting Policies (Policies) Policies http://www.syb.com/20260331/role/statement-note-1-summary-of-significant-accounting-policies 35 false false R36.htm 995446 - Disclosure - Note 2 - Investment Securities (Tables) Sheet http://www.syb.com/20260331/role/statement-note-2-investment-securities-tables Note 2 - Investment Securities (Tables) Tables http://www.syb.com/20260331/role/statement-note-2-investment-securities 36 false false R37.htm 995447 - Disclosure - Note 3 - Loans and Allowance for Credit Losses on Loans (Tables) Sheet http://www.syb.com/20260331/role/statement-note-3-loans-and-allowance-for-credit-losses-on-loans-tables Note 3 - Loans and Allowance for Credit Losses on Loans (Tables) Tables http://www.syb.com/20260331/role/statement-note-3-loans-and-allowance-for-credit-losses-on-loans 37 false false R38.htm 995448 - Disclosure - Note 4 - Goodwill (Tables) Sheet http://www.syb.com/20260331/role/statement-note-4-goodwill-tables Note 4 - Goodwill (Tables) Tables http://www.syb.com/20260331/role/statement-note-4-goodwill 38 false false R39.htm 995449 - Disclosure - Note 5 - Core Deposit and Customer List Intangible Assets (Tables) Sheet http://www.syb.com/20260331/role/statement-note-5-core-deposit-and-customer-list-intangible-assets-tables Note 5 - Core Deposit and Customer List Intangible Assets (Tables) Tables http://www.syb.com/20260331/role/statement-note-5-core-deposit-and-customer-list-intangible-assets 39 false false R40.htm 995450 - Disclosure - Note 6 - Other Assets (Tables) Sheet http://www.syb.com/20260331/role/statement-note-6-other-assets-tables Note 6 - Other Assets (Tables) Tables http://www.syb.com/20260331/role/statement-note-6-other-assets- 40 false false R41.htm 995451 - Disclosure - Note 8 - Deposits (Tables) Sheet http://www.syb.com/20260331/role/statement-note-8-deposits-tables Note 8 - Deposits (Tables) Tables http://www.syb.com/20260331/role/statement-note-8-deposits 41 false false R42.htm 995452 - Disclosure - Note 9 - Securities Sold Under Agreements to Repurchase (Tables) Sheet http://www.syb.com/20260331/role/statement-note-9-securities-sold-under-agreements-to-repurchase-tables Note 9 - Securities Sold Under Agreements to Repurchase (Tables) Tables http://www.syb.com/20260331/role/statement-note-9-securities-sold-under-agreements-to-repurchase 42 false false R43.htm 995453 - Disclosure - Note 10 - Subordinated Debentures (Tables) Sheet http://www.syb.com/20260331/role/statement-note-10-subordinated-debentures-tables Note 10 - Subordinated Debentures (Tables) Tables http://www.syb.com/20260331/role/statement-note-10-subordinated-debentures 43 false false R44.htm 995454 - Disclosure - Note 11 - FHLB Advances and Other Borrowings (Tables) Sheet http://www.syb.com/20260331/role/statement-note-11-fhlb-advances-and-other-borrowings-tables Note 11 - FHLB Advances and Other Borrowings (Tables) Tables http://www.syb.com/20260331/role/statement-note-11-fhlb-advances-and-other-borrowings 44 false false R45.htm 995455 - Disclosure - Note 12 - Commitments and Contingent Liabilities (Tables) Sheet http://www.syb.com/20260331/role/statement-note-12-commitments-and-contingent-liabilities-tables Note 12 - Commitments and Contingent Liabilities (Tables) Tables http://www.syb.com/20260331/role/statement-note-12-commitments-and-contingent-liabilities 45 false false R46.htm 995456 - Disclosure - Note 13 - Assets and Liabilities Measured and Reported at Fair Value (Tables) Sheet http://www.syb.com/20260331/role/statement-note-13-assets-and-liabilities-measured-and-reported-at-fair-value-tables Note 13 - Assets and Liabilities Measured and Reported at Fair Value (Tables) Tables http://www.syb.com/20260331/role/statement-note-13-assets-and-liabilities-measured-and-reported-at-fair-value- 46 false false R47.htm 995457 - Disclosure - Note 14 - Disclosure of Financial Instruments Not Reported at Fair Value (Tables) Sheet http://www.syb.com/20260331/role/statement-note-14-disclosure-of-financial-instruments-not-reported-at-fair-value-tables Note 14 - Disclosure of Financial Instruments Not Reported at Fair Value (Tables) Tables http://www.syb.com/20260331/role/statement-note-14-disclosure-of-financial-instruments-not-reported-at-fair-value- 47 false false R48.htm 995458 - Disclosure - Note 15 - Mortgage Banking Activities (Tables) Sheet http://www.syb.com/20260331/role/statement-note-15-mortgage-banking-activities-tables Note 15 - Mortgage Banking Activities (Tables) Tables http://www.syb.com/20260331/role/statement-note-15-mortgage-banking-activities- 48 false false R49.htm 995459 - Disclosure - Note 16 - Accumulated Other Comprehensive Income (Loss) (Tables) Sheet http://www.syb.com/20260331/role/statement-note-16-accumulated-other-comprehensive-income-loss-tables Note 16 - Accumulated Other Comprehensive Income (Loss) (Tables) Tables http://www.syb.com/20260331/role/statement-note-16-accumulated-other-comprehensive-income-loss 49 false false R50.htm 995460 - Disclosure - Note 18 - Net Income Per Share (Tables) Sheet http://www.syb.com/20260331/role/statement-note-18-net-income-per-share-tables Note 18 - Net Income Per Share (Tables) Tables http://www.syb.com/20260331/role/statement-note-18-net-income-per-share 50 false false R51.htm 995461 - Disclosure - Note 19 - Stock-based Compensation (Tables) Sheet http://www.syb.com/20260331/role/statement-note-19-stockbased-compensation-tables Note 19 - Stock-based Compensation (Tables) Tables http://www.syb.com/20260331/role/statement-note-19-stockbased-compensation- 51 false false R52.htm 995462 - Disclosure - Note 20 - Derivative Financial Instruments (Tables) Sheet http://www.syb.com/20260331/role/statement-note-20-derivative-financial-instruments-tables Note 20 - Derivative Financial Instruments (Tables) Tables http://www.syb.com/20260331/role/statement-note-20-derivative-financial-instruments- 52 false false R53.htm 995463 - Disclosure - Note 21 - Regulatory Matters (Tables) Sheet http://www.syb.com/20260331/role/statement-note-21-regulatory-matters-tables Note 21 - Regulatory Matters (Tables) Tables http://www.syb.com/20260331/role/statement-note-21-regulatory-matters 53 false false R54.htm 995464 - Disclosure - Note 22 - Segments (Tables) Sheet http://www.syb.com/20260331/role/statement-note-22-segments-tables Note 22 - Segments (Tables) Tables http://www.syb.com/20260331/role/statement-note-22-segments- 54 false false R55.htm 995465 - Disclosure - Note 23 - Revenue From Contracts With Customers (Tables) Sheet http://www.syb.com/20260331/role/statement-note-23-revenue-from-contracts-with-customers-tables Note 23 - Revenue From Contracts With Customers (Tables) Tables http://www.syb.com/20260331/role/statement-note-23-revenue-from-contracts-with-customers- 55 false false R56.htm 995466 - Disclosure - Note 24 - Leases (Tables) Sheet http://www.syb.com/20260331/role/statement-note-24-leases-tables Note 24 - Leases (Tables) Tables http://www.syb.com/20260331/role/statement-note-24-leases 56 false false R57.htm 995467 - Disclosure - Note 2 - Investment Securities (Details Textual) Sheet http://www.syb.com/20260331/role/statement-note-2-investment-securities-details-textual Note 2 - Investment Securities (Details Textual) Details http://www.syb.com/20260331/role/statement-note-2-investment-securities-tables 57 false false R58.htm 995468 - Disclosure - Note 2 - Investment Securities - Available-for-sale Securities (Details) Sheet http://www.syb.com/20260331/role/statement-note-2-investment-securities-availableforsale-securities-details Note 2 - Investment Securities - Available-for-sale Securities (Details) Details 58 false false R59.htm 995469 - Disclosure - Note 2 - Investment Securities - Held to Maturity Securities (Details) Sheet http://www.syb.com/20260331/role/statement-note-2-investment-securities-held-to-maturity-securities-details Note 2 - Investment Securities - Held to Maturity Securities (Details) Details 59 false false R60.htm 995470 - Disclosure - Note 2 - Investment Securities - Securities by Contractual Maturity (Details) Sheet http://www.syb.com/20260331/role/statement-note-2-investment-securities-securities-by-contractual-maturity-details Note 2 - Investment Securities - Securities by Contractual Maturity (Details) Details 60 false false R61.htm 995471 - Disclosure - Note 2 - Investment Securities - Securities With Unrealized Losses (Details) Sheet http://www.syb.com/20260331/role/statement-note-2-investment-securities-securities-with-unrealized-losses-details Note 2 - Investment Securities - Securities With Unrealized Losses (Details) Details 61 false false R62.htm 995472 - Disclosure - Note 3 - Loans and Allowance for Credit Losses on Loans (Details Textual) Sheet http://www.syb.com/20260331/role/statement-note-3-loans-and-allowance-for-credit-losses-on-loans-details-textual Note 3 - Loans and Allowance for Credit Losses on Loans (Details Textual) Details http://www.syb.com/20260331/role/statement-note-3-loans-and-allowance-for-credit-losses-on-loans-tables 62 false false R63.htm 995473 - Disclosure - Note 3 - Loans and Allowance for Credit Losses on Loans - Loans by Loan Portfolio Class (Details) Sheet http://www.syb.com/20260331/role/statement-note-3-loans-and-allowance-for-credit-losses-on-loans-loans-by-loan-portfolio-class-details Note 3 - Loans and Allowance for Credit Losses on Loans - Loans by Loan Portfolio Class (Details) Details 63 false false R64.htm 995474 - Disclosure - Note 3 - Loans and Allowance for Credit Losses on Loans - Allowance for Loan Losses (Details) Sheet http://www.syb.com/20260331/role/statement-note-3-loans-and-allowance-for-credit-losses-on-loans-allowance-for-loan-losses-details Note 3 - Loans and Allowance for Credit Losses on Loans - Allowance for Loan Losses (Details) Details 64 false false R65.htm 995475 - Disclosure - Note 3 - Loans and Allowance for Credit Losses on Loans - Non-accrual Loans (Details) Sheet http://www.syb.com/20260331/role/statement-note-3-loans-and-allowance-for-credit-losses-on-loans-nonaccrual-loans-details Note 3 - Loans and Allowance for Credit Losses on Loans - Non-accrual Loans (Details) Details 65 false false R66.htm 995476 - Disclosure - Note 3 - Loans and Allowance for Credit Losses on Loans - Aging of the Recorded Investment in Loans (Details) Sheet http://www.syb.com/20260331/role/statement-note-3-loans-and-allowance-for-credit-losses-on-loans-aging-of-the-recorded-investment-in-loans-details Note 3 - Loans and Allowance for Credit Losses on Loans - Aging of the Recorded Investment in Loans (Details) Details 66 false false R67.htm 995477 - Disclosure - Note 3 - Loans and Allowance for Credit Losses on Loans - Internally Assigned Risk Grades of Loans (Details) Sheet http://www.syb.com/20260331/role/statement-note-3-loans-and-allowance-for-credit-losses-on-loans-internally-assigned-risk-grades-of-loans-details Note 3 - Loans and Allowance for Credit Losses on Loans - Internally Assigned Risk Grades of Loans (Details) Details 67 false false R68.htm 995478 - Disclosure - Note 3 - Loans and Allowance for Credit Losses on Loans - Credit Card Loan Payment Activity (Details) Sheet http://www.syb.com/20260331/role/statement-note-3-loans-and-allowance-for-credit-losses-on-loans-credit-card-loan-payment-activity-details Note 3 - Loans and Allowance for Credit Losses on Loans - Credit Card Loan Payment Activity (Details) Details 68 false false R69.htm 995479 - Disclosure - Note 4 - Goodwill (Details Textual) Sheet http://www.syb.com/20260331/role/statement-note-4-goodwill-details-textual Note 4 - Goodwill (Details Textual) Details http://www.syb.com/20260331/role/statement-note-4-goodwill-tables 69 false false R70.htm 995480 - Disclosure - Note 4 - Goodwill - Carrying Value of Goodwill (Details) Sheet http://www.syb.com/20260331/role/statement-note-4-goodwill-carrying-value-of-goodwill-details Note 4 - Goodwill - Carrying Value of Goodwill (Details) Details 70 false false R71.htm 995481 - Disclosure - Note 5 - Core Deposit and Customer List Intangible Assets (Details Textual) Sheet http://www.syb.com/20260331/role/statement-note-5-core-deposit-and-customer-list-intangible-assets-details-textual Note 5 - Core Deposit and Customer List Intangible Assets (Details Textual) Details http://www.syb.com/20260331/role/statement-note-5-core-deposit-and-customer-list-intangible-assets-tables 71 false false R72.htm 995482 - Disclosure - Note 5 - Core Deposits and Customer List Intangible Assets (Details) Sheet http://www.syb.com/20260331/role/statement-note-5-core-deposits-and-customer-list-intangible-assets-details Note 5 - Core Deposits and Customer List Intangible Assets (Details) Details 72 false false R73.htm 995483 - Disclosure - Note 5 - Core Deposit and Customer List Intangible Assets - Future Amortization Expense (Details) Sheet http://www.syb.com/20260331/role/statement-note-5-core-deposit-and-customer-list-intangible-assets-future-amortization-expense-details Note 5 - Core Deposit and Customer List Intangible Assets - Future Amortization Expense (Details) Details 73 false false R74.htm 995484 - Disclosure - Note 6 - Other Assets - Summary of Major Components of Other Assets (Details) Sheet http://www.syb.com/20260331/role/statement-note-6-other-assets-summary-of-major-components-of-other-assets-details Note 6 - Other Assets - Summary of Major Components of Other Assets (Details) Details 74 false false R75.htm 995485 - Disclosure - Note 7 - Income Taxes (Details Textual) Sheet http://www.syb.com/20260331/role/statement-note-7-income-taxes-details-textual Note 7 - Income Taxes (Details Textual) Details http://www.syb.com/20260331/role/statement-note-7-income-taxes 75 false false R76.htm 995486 - Disclosure - Note 8 - Deposits - Composition of Deposits (Details) Sheet http://www.syb.com/20260331/role/statement-note-8-deposits-composition-of-deposits-details Note 8 - Deposits - Composition of Deposits (Details) Details 76 false false R77.htm 995487 - Disclosure - Note 9 - Securities Sold Under Agreements to Repurchase - Securities Sold Under Agreements to Repurchase (Details) Sheet http://www.syb.com/20260331/role/statement-note-9-securities-sold-under-agreements-to-repurchase-securities-sold-under-agreements-to-repurchase-details Note 9 - Securities Sold Under Agreements to Repurchase - Securities Sold Under Agreements to Repurchase (Details) Details 77 false false R78.htm 995488 - Disclosure - Note 9 - Securities Sold Under Agreements to Repurchase - Repurchase Agreements (Details) Sheet http://www.syb.com/20260331/role/statement-note-9-securities-sold-under-agreements-to-repurchase-repurchase-agreements-details Note 9 - Securities Sold Under Agreements to Repurchase - Repurchase Agreements (Details) Details 78 false false R79.htm 995489 - Disclosure - Note 10 - Subordinated Debentures (Details Textual) Sheet http://www.syb.com/20260331/role/statement-note-10-subordinated-debentures-details-textual Note 10 - Subordinated Debentures (Details Textual) Details http://www.syb.com/20260331/role/statement-note-10-subordinated-debentures-tables 79 false false R80.htm 995490 - Disclosure - Note 10 - Subordinated Debentures - Subordinated Notes (Details) Notes http://www.syb.com/20260331/role/statement-note-10-subordinated-debentures-subordinated-notes-details Note 10 - Subordinated Debentures - Subordinated Notes (Details) Details 80 false false R81.htm 995491 - Disclosure - Note 11 - FHLB Advances and Other Borrowings (Details Textual) Sheet http://www.syb.com/20260331/role/statement-note-11-fhlb-advances-and-other-borrowings-details-textual Note 11 - FHLB Advances and Other Borrowings (Details Textual) Details http://www.syb.com/20260331/role/statement-note-11-fhlb-advances-and-other-borrowings-tables 81 false false R82.htm 995492 - Disclosure - Note 11 - FHLB Advances and Other Borrowings - Contractual Maturities and Average Effective Rates of Outstanding Advances (Details) Sheet http://www.syb.com/20260331/role/statement-note-11-fhlb-advances-and-other-borrowings-contractual-maturities-and-average-effective-rates-of-outstanding-advances-details Note 11 - FHLB Advances and Other Borrowings - Contractual Maturities and Average Effective Rates of Outstanding Advances (Details) Details 82 false false R83.htm 995493 - Disclosure - Note 12 - Commitments and Contingent Liabilities (Details Textual) Sheet http://www.syb.com/20260331/role/statement-note-12-commitments-and-contingent-liabilities-details-textual Note 12 - Commitments and Contingent Liabilities (Details Textual) Details http://www.syb.com/20260331/role/statement-note-12-commitments-and-contingent-liabilities-tables 83 false false R84.htm 995494 - Disclosure - Note 12 - Commitments and Contingent Liabilities - Off Balance Sheet Commitments to Extend Credit (Details) Sheet http://www.syb.com/20260331/role/statement-note-12-commitments-and-contingent-liabilities-off-balance-sheet-commitments-to-extend-credit-details Note 12 - Commitments and Contingent Liabilities - Off Balance Sheet Commitments to Extend Credit (Details) Details 84 false false R85.htm 995495 - Disclosure - Note 13 - Assets and Liabilities Measured and Reported at Fair Value (Details Textual) Sheet http://www.syb.com/20260331/role/statement-note-13-assets-and-liabilities-measured-and-reported-at-fair-value-details-textual Note 13 - Assets and Liabilities Measured and Reported at Fair Value (Details Textual) Details http://www.syb.com/20260331/role/statement-note-13-assets-and-liabilities-measured-and-reported-at-fair-value-tables 85 false false R86.htm 995496 - Disclosure - Note 13 - Assets and Liabilities Measured and Reported at Fair Value - Assets Measured at fair Value on a Recurring Basis (Details) Sheet http://www.syb.com/20260331/role/statement-note-13-assets-and-liabilities-measured-and-reported-at-fair-value-assets-measured-at-fair-value-on-a-recurring-basis-details Note 13 - Assets and Liabilities Measured and Reported at Fair Value - Assets Measured at fair Value on a Recurring Basis (Details) Details 86 false false R87.htm 995497 - Disclosure - Note 13 - Assets and Liabilities Measured and Reported at Fair Value - Assets Measured at Fair Value on a Non-recurring Basis (Details) Sheet http://www.syb.com/20260331/role/statement-note-13-assets-and-liabilities-measured-and-reported-at-fair-value-assets-measured-at-fair-value-on-a-nonrecurring-basis-details Note 13 - Assets and Liabilities Measured and Reported at Fair Value - Assets Measured at Fair Value on a Non-recurring Basis (Details) Details 87 false false R88.htm 995498 - Disclosure - Note 13 - Assets and Liabilities Measured and Reported at Fair Value - Significant Unobservable Inputs (Details) Sheet http://www.syb.com/20260331/role/statement-note-13-assets-and-liabilities-measured-and-reported-at-fair-value-significant-unobservable-inputs-details Note 13 - Assets and Liabilities Measured and Reported at Fair Value - Significant Unobservable Inputs (Details) Details 88 false false R89.htm 995499 - Disclosure - Note 14 - Disclosure of Financial Instruments Not Reported at Fair Value - Fair Value of Financial Instruments (Details) Sheet http://www.syb.com/20260331/role/statement-note-14-disclosure-of-financial-instruments-not-reported-at-fair-value-fair-value-of-financial-instruments-details Note 14 - Disclosure of Financial Instruments Not Reported at Fair Value - Fair Value of Financial Instruments (Details) Details 89 false false R90.htm 995500 - Disclosure - Note 15 - Mortgage Banking Activities (Details Textual) Sheet http://www.syb.com/20260331/role/statement-note-15-mortgage-banking-activities-details-textual Note 15 - Mortgage Banking Activities (Details Textual) Details http://www.syb.com/20260331/role/statement-note-15-mortgage-banking-activities-tables 90 false false R91.htm 995501 - Disclosure - Note 15 - Mortgage Banking Activities - Activity in Mortgage Loans Held for Sale (Details) Sheet http://www.syb.com/20260331/role/statement-note-15-mortgage-banking-activities-activity-in-mortgage-loans-held-for-sale-details Note 15 - Mortgage Banking Activities - Activity in Mortgage Loans Held for Sale (Details) Details 91 false false R92.htm 995502 - Disclosure - Note 15 - Mortgage Banking Activities - Mortgage Banking Income (Details) Sheet http://www.syb.com/20260331/role/statement-note-15-mortgage-banking-activities-mortgage-banking-income-details Note 15 - Mortgage Banking Activities - Mortgage Banking Income (Details) Details 92 false false R93.htm 995503 - Disclosure - Note 15 - Mortgage Banking Activities - Changes in the Net Carrying Amount of MSRs (Details) Sheet http://www.syb.com/20260331/role/statement-note-15-mortgage-banking-activities-changes-in-the-net-carrying-amount-of-msrs-details Note 15 - Mortgage Banking Activities - Changes in the Net Carrying Amount of MSRs (Details) Details 93 false false R94.htm 995504 - Disclosure - Note 15 - Mortgage Banking Activities - Notional amounts and Fair Values (Details) Sheet http://www.syb.com/20260331/role/statement-note-15-mortgage-banking-activities-notional-amounts-and-fair-values-details Note 15 - Mortgage Banking Activities - Notional amounts and Fair Values (Details) Details 94 false false R95.htm 995505 - Disclosure - Note 16 - Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income (loss) by Component (Details) Sheet http://www.syb.com/20260331/role/statement-note-16-accumulated-other-comprehensive-income-loss-accumulated-other-comprehensive-income-loss-by-component-details Note 16 - Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income (loss) by Component (Details) Details http://www.syb.com/20260331/role/statement-note-16-accumulated-other-comprehensive-income-loss-tables 95 false false R96.htm 995506 - Disclosure - Note 17 - Preferred Stock (Details Textual) Sheet http://www.syb.com/20260331/role/statement-note-17-preferred-stock-details-textual Note 17 - Preferred Stock (Details Textual) Details http://www.syb.com/20260331/role/statement-note-17-preferred-stock 96 false false R97.htm 995507 - Disclosure - Note 18 - Net Income Per Share - Basic and Diluted Net Income Per Share (Details) Sheet http://www.syb.com/20260331/role/statement-note-18-net-income-per-share-basic-and-diluted-net-income-per-share-details Note 18 - Net Income Per Share - Basic and Diluted Net Income Per Share (Details) Details 97 false false R98.htm 995508 - Disclosure - Note 18 - Net Income Per Share - Antidilutive SARs (Details) Sheet http://www.syb.com/20260331/role/statement-note-18-net-income-per-share-antidilutive-sars-details Note 18 - Net Income Per Share - Antidilutive SARs (Details) Details 98 false false R99.htm 995509 - Disclosure - Note 19 - Stock-based Compensation (Details Textual) Sheet http://www.syb.com/20260331/role/statement-note-19-stockbased-compensation-details-textual Note 19 - Stock-based Compensation (Details Textual) Details http://www.syb.com/20260331/role/statement-note-19-stockbased-compensation-tables 99 false false R100.htm 995510 - Disclosure - Note 19 - Stock-based Compensation - Fair Value Assumptions (Details) Sheet http://www.syb.com/20260331/role/statement-note-19-stockbased-compensation-fair-value-assumptions-details Note 19 - Stock-based Compensation - Fair Value Assumptions (Details) Details 100 false false R101.htm 995511 - Disclosure - Note 19 - Stock-based Compensation - Stock-based Compensation Expense (Details) Sheet http://www.syb.com/20260331/role/statement-note-19-stockbased-compensation-stockbased-compensation-expense-details Note 19 - Stock-based Compensation - Stock-based Compensation Expense (Details) Details 101 false false R102.htm 995512 - Disclosure - Note 19 - Stock-based Compensation - Unrecognized Stock-based Compensation Expense (Details) Sheet http://www.syb.com/20260331/role/statement-note-19-stockbased-compensation-unrecognized-stockbased-compensation-expense-details Note 19 - Stock-based Compensation - Unrecognized Stock-based Compensation Expense (Details) Details 102 false false R103.htm 995513 - Disclosure - Note 19 - Stock-based Compensation - SARs Activity (Details) Sheet http://www.syb.com/20260331/role/statement-note-19-stockbased-compensation-sars-activity-details Note 19 - Stock-based Compensation - SARs Activity (Details) Details 103 false false R104.htm 995514 - Disclosure - Note 19 - Stock-based Compensation - Restricted Stock (Details) Sheet http://www.syb.com/20260331/role/statement-note-19-stockbased-compensation-restricted-stock-details Note 19 - Stock-based Compensation - Restricted Stock (Details) Details 104 false false R105.htm 995515 - Disclosure - Note 19 - Stock-based Compensation - Performance-based Restricted Stock Units (Details) Sheet http://www.syb.com/20260331/role/statement-note-19-stockbased-compensation-performancebased-restricted-stock-units-details Note 19 - Stock-based Compensation - Performance-based Restricted Stock Units (Details) Details 105 false false R106.htm 995516 - Disclosure - Note 20 - Derivative Financial Instruments (Details Textual) Sheet http://www.syb.com/20260331/role/statement-note-20-derivative-financial-instruments-details-textual Note 20 - Derivative Financial Instruments (Details Textual) Details http://www.syb.com/20260331/role/statement-note-20-derivative-financial-instruments-tables 106 false false R107.htm 995517 - Disclosure - Note 20 - Derivative Financial Instruments - Outstanding Undesignated Interest Rate Swap (Details) Sheet http://www.syb.com/20260331/role/statement-note-20-derivative-financial-instruments-outstanding-undesignated-interest-rate-swap-details Note 20 - Derivative Financial Instruments - Outstanding Undesignated Interest Rate Swap (Details) Details 107 false false R108.htm 995518 - Disclosure - Note 21 - Regulatory Matters (Details Textual) Sheet http://www.syb.com/20260331/role/statement-note-21-regulatory-matters-details-textual Note 21 - Regulatory Matters (Details Textual) Details http://www.syb.com/20260331/role/statement-note-21-regulatory-matters-tables 108 false false R109.htm 995519 - Disclosure - Note 21 - Regulatory Matters - Risk Based Capital Amounts and Ratios (Details) Sheet http://www.syb.com/20260331/role/statement-note-21-regulatory-matters-risk-based-capital-amounts-and-ratios-details Note 21 - Regulatory Matters - Risk Based Capital Amounts and Ratios (Details) Details 109 false false R110.htm 995520 - Disclosure - Note 22 - Segments (Details Textual) Sheet http://www.syb.com/20260331/role/statement-note-22-segments-details-textual Note 22 - Segments (Details Textual) Details http://www.syb.com/20260331/role/statement-note-22-segments-tables 110 false false R111.htm 995521 - Disclosure - Note 22 - Segments - Schedule of Segment Reporting Information (Details) Sheet http://www.syb.com/20260331/role/statement-note-22-segments-schedule-of-segment-reporting-information-details Note 22 - Segments - Schedule of Segment Reporting Information (Details) Details 111 false false R112.htm 995522 - Disclosure - Note 23 - Revenue From Contracts With Customers (Details Textual) Sheet http://www.syb.com/20260331/role/statement-note-23-revenue-from-contracts-with-customers-details-textual Note 23 - Revenue From Contracts With Customers (Details Textual) Details http://www.syb.com/20260331/role/statement-note-23-revenue-from-contracts-with-customers-tables 112 false false R113.htm 995523 - Disclosure - Note 23 - Revenue From Contracts With Customers - Disaggregation of Revenue (Details) Sheet http://www.syb.com/20260331/role/statement-note-23-revenue-from-contracts-with-customers-disaggregation-of-revenue-details Note 23 - Revenue From Contracts With Customers - Disaggregation of Revenue (Details) Details 113 false false R114.htm 995524 - Disclosure - Note 24 - Leases (Details Textual) Sheet http://www.syb.com/20260331/role/statement-note-24-leases-details-textual Note 24 - Leases (Details Textual) Details http://www.syb.com/20260331/role/statement-note-24-leases-tables 114 false false R115.htm 995525 - Disclosure - Note 24 - Leases - Balance Sheet location (Details) Sheet http://www.syb.com/20260331/role/statement-note-24-leases-balance-sheet-location-details Note 24 - Leases - Balance Sheet location (Details) Details 115 false false R116.htm 995526 - Disclosure - Note 25 - Subsequent Event (Details Textual) Sheet http://www.syb.com/20260331/role/statement-note-25-subsequent-event-details-textual Note 25 - Subsequent Event (Details Textual) Details http://www.syb.com/20260331/role/statement-note-25-subsequent-event 116 false false All Reports Book All Reports sybt-20260331.xsd sybt-20260331_cal.xml sybt-20260331_def.xml sybt-20260331_lab.xml sybt-20260331_pre.xml sybt20260331_10q.htm syblogo.jpg http://fasb.org/us-gaap/2026 http://xbrl.sec.gov/dei/2026 http://xbrl.sec.gov/ecd/2026 true true