v3.25.4
Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instrument (Detail) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 607,817 $ 383,747
Interest-bearing deposit in other banks 575  
Available-for-sale securities 1,030,568 1,004,455
Held-to-maturity securities 5,409 5,214
Loans held for sale 1,392 513
Loans, net of allowance for credit losses 4,145,424 3,457,549
Federal Reserve Bank and Federal Home Loan Bank stock 34,053 27,875
Interest receivable 33,322 28,913
Derivative assets 5,758 8,055
Total assets 6,373,172 5,332,047
Deposits 5,138,264 4,374,789
Federal funds purchased and retail repurchase agreements 39,864 37,246
Federal Home Loan Bank advances 300,000 178,073
Subordinated debentures 98,145 97,477
Contractual obligations 10,208 12,067
Derivative Liabilities 2,808 3,546
Cash collateral held by counterparty and netting adjustments (3,367) (7,173)
Total liabilities 5,641,118 4,739,129
Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 607,817 383,747
Interest-bearing deposit in other banks 575  
Available-for-sale securities 1,030,568 1,004,455
Held-to-maturity securities 5,248 5,217
Loans held for sale 1,392 513
Loans, net of allowance for credit losses 4,145,424 3,457,549
Federal Reserve Bank and Federal Home Loan Bank stock 34,053 27,875
Interest receivable 33,322 28,913
Derivative assets 5,758 8,055
Cash collateral held by derivative counterparty and netting adjustments (3,367) (7,173)
Total derivative assets 2,391 882
Equity securities with readily determinable fair value 1,182 1,031
Total assets 5,861,972 4,910,182
Deposits 5,138,264 4,374,789
Federal funds purchased and retail repurchase agreements 39,864 37,246
Federal Home Loan Bank advances 300,000 178,073
Subordinated debentures 24,308 23,946
Subordinated notes 73,837 73,531
Contractual obligations 10,208 12,067
Interest payable 9,757 5,032
Derivative Liabilities 2,808 3,546
Cash collateral held by counterparty and netting adjustments (8) 97
Total derivative liabilities 2,800 3,643
Total liabilities 5,599,038 4,708,327
Estimated Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 607,817 383,747
Interest-bearing deposit in other banks 575  
Available-for-sale securities 1,030,568 1,004,455
Held-to-maturity securities 5,409 5,214
Loans held for sale 1,392 513
Loans, net of allowance for credit losses 4,126,632 3,405,767
Federal Reserve Bank and Federal Home Loan Bank stock 34,053 27,875
Interest receivable 33,322 28,913
Derivative assets 5,758 8,055
Cash collateral held by derivative counterparty and netting adjustments (3,367) (7,173)
Total derivative assets 2,391 882
Equity securities with readily determinable fair value 1,182 1,031
Deposits 5,135,904 4,370,728
Federal funds purchased and retail repurchase agreements 39,864 37,246
Federal Home Loan Bank advances 300,000 178,073
Subordinated debentures 24,308 23,946
Subordinated notes 75,524 73,156
Contractual obligations 10,208 12,067
Interest payable 9,757 5,032
Derivative Liabilities 2,808 3,546
Cash collateral held by counterparty and netting adjustments (8) 97
Total derivative liabilities 2,800 3,643
Total liabilities 5,598,365 4,703,891
Estimated Fair Value [Member] | Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 607,817 383,747
Available-for-sale securities 35,250 86,563
Cash collateral held by derivative counterparty and netting adjustments (3,367) (7,173)
Total derivative assets (3,367) (7,173)
Equity securities with readily determinable fair value 1,182 1,031
Cash collateral held by counterparty and netting adjustments (8) 97
Total derivative liabilities (8) 97
Total liabilities 8 97
Estimated Fair Value [Member] | Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest-bearing deposit in other banks 575  
Available-for-sale securities 995,318 917,892
Held-to-maturity securities 5,409 5,214
Loans held for sale 1,392 513
Federal Reserve Bank and Federal Home Loan Bank stock 34,053 27,875
Interest receivable 33,322 28,913
Derivative assets 5,758 8,055
Total derivative assets 5,758 8,055
Deposits 5,135,904 4,370,728
Federal funds purchased and retail repurchase agreements 39,864 37,246
Federal Home Loan Bank advances 300,000 178,073
Subordinated debentures 24,308 23,946
Subordinated notes 75,524 73,156
Contractual obligations 10,208 12,067
Interest payable 9,757 5,032
Derivative Liabilities 2,808 3,546
Total derivative liabilities 2,808 3,546
Total liabilities 5,598,373 4,703,794
Estimated Fair Value [Member] | Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans, net of allowance for credit losses 4,126,632 3,405,767
Fair Value, Measurements, Nonrecurring [Member] | Estimated Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets 5,843,341 4,858,397
Fair Value, Measurements, Nonrecurring [Member] | Estimated Fair Value [Member] | Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets 640,882 464,168
Fair Value, Measurements, Nonrecurring [Member] | Estimated Fair Value [Member] | Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets 1,075,827 988,462
Fair Value, Measurements, Nonrecurring [Member] | Estimated Fair Value [Member] | Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets $ 4,126,632 $ 3,405,767