Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instrument (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 383,747	$ 379,099
Available-for-sale securities	1,004,455	919,648
Held-to-maturity securities	5,214	2,250
Loans held for sale	513	476
Loans, net of allowance for credit losses	3,457,549	3,289,381
Federal Reserve Bank and Federal Home Loan Bank stock	27,875	20,608
Interest receivable	28,913	25,497
Derivative assets	8,055	7,002
Total assets	5,332,047	5,034,592
Deposits	4,374,789	4,145,455
Federal funds purchased and retail repurchase agreements	37,246	43,582
Federal Home Loan Bank advances	178,073	100,000
Subordinated debentures	97,477	96,921
Contractual obligations	12,067	19,315
Derivative Liabilities	3,546	3,656
Cash collateral held by counterparty and netting adjustments	(7,173)	(6,406)
Total liabilities	4,739,129	4,581,732
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	383,747	379,099
Available-for-sale securities	1,004,455	919,648
Held-to-maturity securities	5,217	2,209
Loans held for sale	513	476
Loans, net of allowance for credit losses	3,457,549	3,289,381
Federal Reserve Bank and Federal Home Loan Bank stock	27,875	20,608
Interest receivable	28,913	25,497
Derivative assets	8,055	7,002
Cash collateral held by derivative counterparty and netting adjustments	(7,173)	(6,406)
Total derivative assets	882	596
Equity securities with readily determinable fair value	1,031	674
Total assets	4,910,182	4,638,188
Deposits	4,374,789	4,145,455
Federal funds purchased and retail repurchase agreements	37,246	43,582
Federal Home Loan Bank advances	178,073	100,000
Federal Reserve Bank borrowings		140,000
Subordinated debentures	23,946	23,594
Subordinated notes	73,531	73,327
Contractual obligations	12,067	19,315
Interest payable	5,032	9,180
Derivative Liabilities	3,546	3,656
Cash collateral held by counterparty and netting adjustments	97	(454)
Total derivative liabilities	3,643	3,202
Total liabilities	4,708,327	4,557,655
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	383,747	379,099
Available-for-sale securities	1,004,455	919,648
Held-to-maturity securities	5,214	2,250
Loans held for sale	513	476
Loans, net of allowance for credit losses	3,405,767	3,227,789
Federal Reserve Bank and Federal Home Loan Bank stock	27,875	20,608
Interest receivable	28,913	25,497
Derivative assets	8,055	7,002
Cash collateral held by derivative counterparty and netting adjustments	(7,173)	(6,406)
Total derivative assets	882	596
Equity securities with readily determinable fair value	1,031	674
Deposits	4,370,728	4,140,501
Federal funds purchased and retail repurchase agreements	37,246	43,582
Federal Home Loan Bank advances	178,073	100,000
Federal Reserve Bank borrowings		140,000
Subordinated debentures	23,946	23,594
Subordinated notes	73,156	71,827
Contractual obligations	12,067	19,315
Interest payable	5,032	9,180
Derivative Liabilities	3,546	3,656
Cash collateral held by counterparty and netting adjustments	97	(454)
Total derivative liabilities	3,643	3,202
Total liabilities	4,703,891	4,551,201
Estimated Fair Value [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	383,747	379,099
Available-for-sale securities	86,563	89,256
Cash collateral held by derivative counterparty and netting adjustments	(7,173)	(6,406)
Total derivative assets	(7,173)	(6,406)
Equity securities with readily determinable fair value	1,031	674
Cash collateral held by counterparty and netting adjustments	97	(454)
Total derivative liabilities	97	(454)
Total liabilities	97	454
Estimated Fair Value [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	917,892	830,392
Held-to-maturity securities	5,214	2,250
Loans held for sale	513	476
Federal Reserve Bank and Federal Home Loan Bank stock	27,875	20,608
Interest receivable	28,913	25,497
Derivative assets	8,055	7,002
Total derivative assets	8,055	7,002
Deposits	4,370,728	4,140,501
Federal funds purchased and retail repurchase agreements	37,246	43,582
Federal Home Loan Bank advances	178,073	100,000
Federal Reserve Bank borrowings		140,000
Subordinated debentures	23,946	23,594
Subordinated notes	73,156	71,827
Contractual obligations	12,067	19,315
Interest payable	5,032	9,180
Derivative Liabilities	3,546	3,656
Total derivative liabilities	3,546	3,656
Total liabilities	4,703,794	4,551,655
Estimated Fair Value [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans, net of allowance for credit losses	3,405,767	3,227,789
Fair Value, Measurements, Nonrecurring [Member] | Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	4,858,397	4,576,637
Fair Value, Measurements, Nonrecurring [Member] | Estimated Fair Value [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	464,168	462,623
Fair Value, Measurements, Nonrecurring [Member] | Estimated Fair Value [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	988,462	886,225
Fair Value, Measurements, Nonrecurring [Member] | Estimated Fair Value [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	$ 3,405,767	$ 3,227,789