v3.26.1
Fair Value of Financial Assets and Liabilities - Fair Value of Financial Instruments and Levels within Fair Value Hierarchy of Valuation Techniques (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Financial assets:    
Debt securities available-for-sale $ 1,088,205 $ 1,120,719
Equity securities at fair value 3,666 4,154
Federal Reserve Bank stock 4,887 4,887
Mortgage servicing rights 6,728 6,751
Carrying Amount [Member]    
Financial assets:    
Cash and cash equivalents 358,655 363,684
Certificates of deposit in other banks 245 245
Debt securities available-for-sale 1,088,205 1,120,719
Equity securities at fair value 3,666 4,154
Loans held for sale 73 211
Loans, net 4,929,500 4,834,773
Federal Home Loan Bank stock 5,200 5,200
Federal Reserve Bank stock 4,887 4,887
Mortgage servicing rights 6,728 6,751
Accrued interest receivable 25,591 25,957
Financial liabilities:    
Deposits 5,434,220 5,389,058
Repurchase agreements 298,721 308,799
Federal funds purchased 500 500
Advances from Federal Home Loan Bank 288 293
Long-term debt 63,724 63,784
Accrued interest payable 11,567 8,535
Unrecognized financial instruments:    
Letters of credit 0 0
Commitments to extend credit 0 0
Forward sale commitments 0 0
Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets:    
Cash and cash equivalents 358,655 363,684
Certificates of deposit in other banks 0 0
Debt securities available-for-sale 0 0
Equity securities at fair value 0 0
Loans held for sale 74 214
Loans, net 0 0
Federal Home Loan Bank stock 0 0
Federal Reserve Bank stock 0 0
Mortgage servicing rights 0 0
Accrued interest receivable 0 0
Financial liabilities:    
Deposits 1,262,835 1,263,243
Repurchase agreements 0 0
Federal funds purchased 0 0
Advances from Federal Home Loan Bank 0 0
Long-term debt 0 0
Accrued interest payable 0 0
Unrecognized financial instruments:    
Letters of credit 0 0
Commitments to extend credit 0 0
Forward sale commitments 0 0
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial assets:    
Cash and cash equivalents 0 0
Certificates of deposit in other banks 245 245
Debt securities available-for-sale 1,088,205 1,120,719
Equity securities at fair value 0 0
Loans held for sale 0 0
Loans, net 0 0
Federal Home Loan Bank stock 5,200 5,200
Federal Reserve Bank stock 4,887 4,887
Mortgage servicing rights 0 0
Accrued interest receivable 25,591 25,957
Financial liabilities:    
Deposits 3,966,881 3,896,447
Repurchase agreements 298,686 308,769
Federal funds purchased 500 500
Advances from Federal Home Loan Bank 299 304
Long-term debt 57,716 60,483
Accrued interest payable 11,567 8,535
Unrecognized financial instruments:    
Letters of credit 0 0
Commitments to extend credit 0 0
Forward sale commitments 0 0
Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial assets:    
Cash and cash equivalents 0 0
Certificates of deposit in other banks 0 0
Debt securities available-for-sale 0 0
Equity securities at fair value 3,666 4,154
Loans held for sale 0 0
Loans, net 4,976,103 4,918,385
Federal Home Loan Bank stock 0 0
Federal Reserve Bank stock 0 0
Mortgage servicing rights 6,728 6,751
Accrued interest receivable 0 0
Financial liabilities:    
Deposits 0 0
Repurchase agreements 0 0
Federal funds purchased 0 0
Advances from Federal Home Loan Bank 0 0
Long-term debt 0 0
Accrued interest payable 0 0
Unrecognized financial instruments:    
Letters of credit 0 0
Commitments to extend credit 0 0
Forward sale commitments $ 0 $ 0