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Disclosures [Abstract] Part of Loan Relationship [Domain] Part of Loan Relationship [Domain] [Domain] for Part of Loan Relationship [Axis] Investment Income [Table] Investment Income [Table] Gross increase in market value adjustment to derivatives Unrealized Gain (Loss) on Derivatives First Commonwealth Capital Trust II [Member] First Commonwealth Capital Trust II [Member] First Commonwealth Capital Trust II [Member] Statistical Measurement [Axis] Statistical Measurement [Axis] Weighted Average Number of Shares Issued, Basic Weighted Average Number of Shares Issued, Basic Service charges on deposit accounts Fees and Commissions on Depositor Accounts Fees and Commissions on Depositor Accounts Business Combination, Goodwill, Reportable Segment Assignment [Table] Business Combination, Goodwill, Reportable Segment Assignment [Table] Impaired loans Impaired Loans Fair Value Impaired loans fair value. 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acquisition day 1 non-PCD Provision for credit losses - acquisition day 1 non-PCD Provision for credit losses - acquisition day 1 non-PCD Interest on other long-term debt Interest Expense, Other Long-Term Debt Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Trust income Fees and Commissions on Trust and Fiduciary Accounts Fees and Commissions on Trust and Fiduciary Accounts Derivative Instruments Designated As Hedging Instruments Interest Expense Derivative Instruments Designated As Hedging Instruments Interest Expense Derivative Instruments Designated As Hedging Instruments Interest Expense Derivative Instruments Designated As Hedging Instruments Interest Expense Common Stock Equivalents Not Included in Computation of Diluted Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Extended Maturity [Member] Extended Maturity [Member] Owner Occupied Commercial Real Estate Owner Occupied Commercial Real Estate [Member] Owner Occupied Commercial Real Estate Supplemental Comprehensive Income Disclosures [Abstract] Supplemental Comprehensive Income Disclosures [Abstract] Supplemental Comprehensive Income Disclosures [Abstract] Weighted Average Number of Shares, Deferred Compensation Plans Weighted Average Number of Shares, Deferred Compensation Plans Weighted Average Number of Shares, Deferred Compensation Plans Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Increases Decreases in Nonperforming Loans [Axis] Increases Decreases in Nonperforming Loans [Axis] Increases Decreases in Nonperforming Loans [Axis] Swap fee income Derivative Fee Income Derivative Fee Income Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total Available-for-Sale Securities Sold [Axis] Available-for-Sale Securities Sold [Axis] Available-for-Sale Securities Sold Redemption Premium Redemption Premium Lessee, Operating Lease, Liability, Undiscounted Excess Amount Lessee, Operating Lease, Liability, Undiscounted Excess Amount Proceeds from Sale of Equity Securities, FV-NI Proceeds from Sale of Equity Securities, FV-NI Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Income Taxes Paid, Net Income Taxes Paid, Net Treasury stock acquired, shares Treasury Stock, Shares, Acquired Commitments to extend credit [Member] Commitments to Extend Credit [Member] Financing Receivables Purchased Without Creidt Deterioration Discount Premium Financing Receivable, Purchased without Credit Deterioration, Discount (Premium) Financing Receivable, Purchased without Credit Deterioration, Discount (Premium) Construction Residential Construction Residential [Member] Construction Residential Risk Participation Agreements [Domain] Risk Participation Agreements [Domain] [Domain] for Risk Participation Agreements [Axis] Non Accrual Status Of Loans After Number Of Days Past Due Non Accrual Status Of Loans After Number Of Days Past Due Non Accrual Status Of Loans After Number Of Days Past Due Measurement Frequency [Domain] Measurement Frequency [Domain] Operating Leases, Future Minimum Payments Due Lessee, Operating Lease, Liability, to be Paid Other comprehensive income (loss) before reclassification adjustment OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Contractual Interest Rate Reduction and Payment Deferral Contractual Interest Rate Reduction and Payment Deferral [Member] Contractual Interest Rate Reduction and Payment Deferral Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Subordinated Borrowings Disclosure [Text Block] Subordinated Borrowings Disclosure [Text Block] Proceeds from sale of mortgage loans Proceeds from Sale, Loan, Mortgage, Held-for-Sale Net Income Net Income Net Income (Loss) Attributable to Parent Investment Securities in Unrealized Loss Position, Qualitative Disclosure, Number of Positions, Total Investment Securities in Unrealized Loss Position, Qualitative Disclosure, Number of Positions, Total Investment Securities in Unrealized Loss Position, Qualitative Disclosure, Number of Positions, Total Provision for credit losses - portfolio Provision for credit losses - portfolio Provision for credit losses - portfolio Charge-offs [Domain] Charge-offs [Domain] [Domain] for Charge-offs [Axis] Credit Default Swap [Member] Credit Default Swap [Member] Proceeds from reissuance of treasury stock Proceeds from Sale of Treasury Stock Nonaccrual Loans Paid Off [Axis] Nonaccrual Loans Paid Off [Axis] Nonaccrual Loans Paid Off [Axis] Debt Security, Government, Non-US [Member] Debt Security, Government, Non-US [Member] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Premises and equipment, net Property, Plant and Equipment, Net Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Purchase of treasury stock Payments for Repurchase of Common Stock Shares Issued, Price Per Share Shares Issued, Price Per Share Real estate construction [Member] Construction Loans [Member] Entity Current Reporting Status Entity Current Reporting Status Receivables [Abstract] Derivative [Line Items] Derivative [Line Items] Restricted Stock Units [Member] Restricted Stock Units [Member] Restricted Stock Units [Member] Collateral Held [Axis] Collateral Held [Axis] Corporate Securities [Member] Corporate Securities [Member] Corporate securities. Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Retained earnings Retained Earnings (Accumulated Deficit) Subordinated Debentures Outstanding [Abstract] Subordinated Debentures Outstanding [Abstract] Subordinated Debentures Outstanding [Abstract] Nonperforming Loans [Axis] Nonperforming Loans [Axis] Nonperforming Loans [Axis] Financial Instrument [Axis] Financial Instrument [Axis] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Income from increase in cash surrender value of bank owned life insurance Increase In Cash Surrender Value of BOLI Increase In Cash Surrender Value of BOLI Payments to Acquire Held-to-maturity Securities Payments to Acquire Held-to-Maturity Securities Class of Stock [Axis] Class of Stock [Axis] Total interest expense Interest Expense Interest Expense, Operating and Nonoperating Current Fiscal Year End Date Current Fiscal Year End Date Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Brokerage Commissions Revenue Brokerage Commissions Revenue Total deposits Deposits Deposits With a Related Allowance With a Related Allowance [Member] With a Related Allowance Nonperforming Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method Nonperforming Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method Nonperforming Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method Outstanding Balances of Loan Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Federal Home Loan Bank Stock Federal Home Loan Bank Stock Debt Securities, Held-to-maturity Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss Other professional fees and services Professional Fees Statement [Table] Statement [Table] Business Combination, Recognized Asset Acquired, Investment in Debt and Equity Securities, Current Business Combination, Recognized Asset Acquired, Investment in Debt and Equity Securities, Current Subordinated Debentures [Abstract] Subordinated Debentures [Abstract] Subordinated Debentures [Abstract] Deferred tax expense Deferred Income Tax Expense (Benefit) Financing Activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Other Noninterest Expense Other Noninterest Expense Loan Restructuring Modification [Axis] Loan Restructuring Modification [Axis] Pass [Member] Pass [Member] Interest Rate Contract [Member] Interest Rate Contract [Member] Nonaccrual Commercial Loans [Member] Nonaccrual Commercial Loans [Member] Nonaccrual Commercial Loans [Member] Financing Receivable, Excluding Accrued Interest, Modified, Increase (Decrease) from Modification Financing Receivable, Excluding Accrued Interest, Modified, Increase (Decrease) from Modification Gross Losses Gross Losses Gross Losses This item represents the gross loss on maturities of available for sale securities. Non Accrual Loans [Member] Non Accrual Loans [Member] Non Accrual Loans [Member] Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Term Loan Receivable, Originated Four Years Prior Term Loan Receivable, Originated Four Years Prior [Member] Term Loan Receivable, Originated Four Years Prior Stock Issued During Period, Value, Acquisitions Stock Issued During Period, Value, Acquisitions Unrecognized Tax Benefits Unrecognized Tax Benefits Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) Antidilutive securities excluded from computation of earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Contractual Interest Rate Reduction [Member] Contractual Interest Rate Reduction [Member] Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value Amendment Flag Amendment Flag Schedule of Held-to-maturity Securities [Line Items] Schedule of Held-to-Maturity Securities [Line Items] Age Analysis of Past Due Loans by Segment Financing Receivable, Past Due [Table Text Block] Lessee, Operating Leases [Text Block] Lessee, Operating Leases [Text Block] Net cash (used in) provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Interest-bearing bank deposits Interest-bearing deposits Interest-Bearing Deposits in Banks and Other Financial Institutions Subordinated Debt Par Amount Subordinated Debt Par Amount Subordinated Debt Par Amount Receivable Type [Domain] Receivable [Domain] In-Scope of Topic 606 [Member] In-Scope of Topic 606 [Member] In-Scope of Topic 606 [Member] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Operating Lease, Weighted Average Discount Rate, Percent Operating Lease, Weighted Average Discount Rate, Percent Derivative, Fair Value, Net Derivative, Fair Value, Net Derivative, Fair Value, Net Average Shares Outstanding (in shares) Weighted average common shares and common stock equivalents used to calculate basic earnings per share (in shares) Weighted Average Number of Shares Outstanding, Basic Supplemental Cash Flow Disclosures Cash Flow, Supplemental Disclosures [Text Block] Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Segment Reporting [Abstract] Operating Lease, Expense Operating Lease, Expense Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Entity Tax Identification Number Entity Tax Identification Number Restatement [Domain] Scenario [Domain] Asset Acquisition [Axis] Asset Acquisition [Axis] Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value Unrealized holding (losses) gains on securities arising during the period Unrealized holding gains on securities arising during the period OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Loans and Leases Receivable Disclosure [Abstract] Loans and Leases Receivable Disclosure [Abstract] Short [Member] Short [Member] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Composition of Weighted-Average Common Shares (Denominator) Used in Basic and Diluted Earnings Per Share Schedule of Weighted Average Number of Shares [Table Text Block] Operating Lease, Weighted Average Remaining Lease Term Operating Lease, Weighted Average Remaining Lease Term Geographic Distribution [Axis] Geographic Distribution [Axis] Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Assets Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Assets Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Assets Fair value of loans transferred from held to maturity to held for sale Loan and Lease, Transfer from Held-in-Portfolio to Held-for-Sale Management Fees, Incentive Revenue (Deprecated 2018-01-31) Incentive Revenue Incentive Revenue Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] Payments of Dividends Payments of Dividends Income tax benefit (expense) related to items of other comprehensive (loss) income Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Net occupancy expense Occupancy, Net Loans and Leases Receivable, Gain (Loss) on Sales, Net Loans and Leases Receivable, Gain (Loss) on Sales, Net Increase in income taxes payable Increase (Decrease) in Income Taxes Payable Loss Contingencies [Line Items] Loss Contingencies [Line Items] Source of Realized Gains (Losses) [Domain] Source of Realized Gains (Losses) [Domain] Source of Realized Gains (Losses) [Domain] Security Exchange Name Security Exchange Name Financial Asset, Not Past Due Financial Asset, Not Past Due [Member] Equity Securities [Member] Equity Securities [Member] Financing Receivable, Nonaccrual Related Allowance Financing Receivable, Nonaccrual Related Allowance Financing Receivable, Nonaccrual Related Allowance Total liabilities Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Due within one year, Amortized Cost Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost Maturity Date [Axis] Maturity Date [Axis] Maturity Date Investment Securities, Qualitative Disclosure, Number of Positions, Total Investment Securities, Qualitative Disclosure, Number of Positions, Total Investment Securities, Qualitative Disclosure, Number of Positions, Total Fair Value by Asset Class [Domain] Asset Class [Domain] Net increase in loans and leases Payments for (Proceeds from) Loans and Leases Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Deposits Contractual Amount Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Deposits Contractual Amount Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Deposits Contractual Amount Financing Receivable, Modified, Subsequent Default [Table] Financing Receivable, Modified, Subsequent Default [Table] Total gains or losses included in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 2024 [Member] 2024 [Member] 2024 [Member] Business Combination Integration Related Total Costs Business Combination Integration Related Total Costs Business Combination Integration Related Total Costs Proceeds from sale of other assets Proceeds from Sale of Other Productive Assets Derivative Liability, Notional Amount, Gross Asset Derivative Liability, Notional Amount, Gross Asset Derivative Liability, Notional Amount, Gross Asset Business Combination, Recognized Liability Assumed, Long-Term Debt, Noncurrent Business Combination, Recognized Liability Assumed, Long-Term Debt, Noncurrent Statement [Line Items] Statement [Line Items] First Commonwealth Capital Trust III [Member] First Commonwealth Capital Trust III [Member] First Commonwealth Capital Trust III Debt Securities, Held-to-maturity, Restricted Debt Securities, Held-to-Maturity, Restricted Interest on subordinated debentures Interest Expense, Subordinated Notes and Debentures Proceeds from sale and maturity of held-to-maturity securities Proceeds from Maturities, Prepayments and Calls of Held-to-Maturity Securities Common Stock [Member] Common Stock [Member] Securities available for sale, at fair value Debt Securities, Available-for-Sale Debt Securities, Available-for-Sale Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Nonperforming Loans [Domain] Nonperforming Loans [Domain] [Domain] for Nonperforming Loans [Axis] Corporate Debt Securities [Member] Corporate Debt Securities [Member] Contractual Interest Rate Reduction, Term Extension, and Payment Deferral Contractual Interest Rate Reduction, Term Extension, and Payment Deferral [Member] Contractual Interest Rate Reduction, Term Extension, and Payment Deferral Fair Value Measurement Of Assets On Nonrecurring Basis Net Losses On Loans Held For Sale Fair Value Measurement Of Assets On Nonrecurring Basis Net Losses On Loans Held For Sale Fair Value Measurement Of Assets On Nonrecurring Basis Net Losses On Loans Held For Sale