Fair Value - Carrying Amount and Estimated Fair Values of Financial Instrument (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 260,266	$ 379,099
Available-for-sale securities	1,042,176	919,648
Held-to-maturity securities	5,267	2,250
Loans held for sale	1,959	476
Loans, net of allowance for credit losses	3,410,920	3,289,381
Federal Reserve Bank and Federal Home Loan Bank stock	33,171	20,608
Interest receivable	27,381	25,497
Derivative assets	9,671	7,002
Total assets	5,245,517	5,034,592
Deposits	4,341,437	4,145,455
Federal funds purchased and retail repurchase agreements	38,031	43,582
Federal Home Loan Bank advances	250,306	100,000
Subordinated debentures	97,196	96,921
Contractual obligations	23,770	19,315
Derivative Liabilities	3,786	3,656
Cash collateral held by counterparty and netting adjustments	(8,852)	(6,406)
Total liabilities	4,784,082	4,581,732
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	260,266	379,099
Available-for-sale securities	1,042,176	919,648
Held-to-maturity securities	5,226	2,209
Loans held for sale	1,959	476
Loans, net of allowance for credit losses	3,410,920	3,289,381
Federal Reserve Bank and Federal Home Loan Bank stock	33,171	20,608
Interest receivable	27,381	25,497
Derivative assets	9,671	7,002
Cash collateral held by derivative counterparty and netting adjustments	(8,852)	(6,406)
Total derivative assets	819	596
Equity securities with readily determinable fair value	648	674
Total assets	4,782,566	4,638,188
Deposits	4,341,437	4,145,455
Federal funds purchased and retail repurchase agreements	38,031	43,582
Federal Home Loan Bank advances	250,306	100,000
Federal Reserve Bank borrowings		140,000
Subordinated debentures	23,769	23,594
Subordinated notes	73,427	73,327
Contractual obligations	23,770	19,315
Interest payable	6,777	9,180
Derivative Liabilities	3,786	3,656
Cash collateral held by counterparty and netting adjustments	189	(454)
Total derivative liabilities	3,975	3,202
Total liabilities	4,761,492	4,557,655
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	260,266	379,099
Available-for-sale securities	1,042,176	919,648
Held-to-maturity securities	5,267	2,250
Loans held for sale	1,959	476
Loans, net of allowance for credit losses	3,352,188	3,227,789
Federal Reserve Bank and Federal Home Loan Bank stock	33,171	20,608
Interest receivable	27,381	25,497
Derivative assets	9,671	7,002
Cash collateral held by derivative counterparty and netting adjustments	(8,852)	(6,406)
Total derivative assets	819	596
Equity securities with readily determinable fair value	648	674
Deposits	4,336,232	4,140,501
Federal funds purchased and retail repurchase agreements	38,031	43,582
Federal Home Loan Bank advances	250,306
Federal Reserve Bank borrowings		140,000
Subordinated debentures	23,769	23,594
Subordinated notes	72,302	71,827
Contractual obligations	23,770	19,315
Interest payable	6,777	9,180
Derivative Liabilities	3,786	3,656
Cash collateral held by counterparty and netting adjustments	189	(454)
Total derivative liabilities	3,975	3,202
Total liabilities	4,755,162	4,551,201
Estimated Fair Value [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	260,266	379,099
Available-for-sale securities	95,039	89,256
Cash collateral held by derivative counterparty and netting adjustments	(8,852)	(6,406)
Total derivative assets	(8,852)	(6,406)
Equity securities with readily determinable fair value	648	674
Cash collateral held by counterparty and netting adjustments	189	(454)
Total derivative liabilities	189	(454)
Total liabilities	189	454
Estimated Fair Value [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	947,137	830,392
Held-to-maturity securities	5,267	2,250
Loans held for sale	1,959	476
Federal Reserve Bank and Federal Home Loan Bank stock	33,171	20,608
Interest receivable	27,381	25,497
Derivative assets	9,671	7,002
Total derivative assets	9,671	7,002
Deposits	4,336,232	4,140,501
Federal funds purchased and retail repurchase agreements	38,031	43,582
Federal Home Loan Bank advances	250,306	100,000
Federal Reserve Bank borrowings		140,000
Subordinated debentures	23,769	23,594
Subordinated notes	72,302	71,827
Contractual obligations	23,770	19,315
Interest payable	6,777	9,180
Derivative Liabilities	3,786	3,656
Total derivative liabilities	3,786	3,656
Total liabilities	4,754,973	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	3,352,188	3,227,789
Fair Value, Measurements, Nonrecurring [Member] | Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	4,723,875	4,576,637
Federal Home Loan Bank advances		100,000
Fair Value, Measurements, Nonrecurring [Member] | Estimated Fair Value [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	347,101	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	1,024,586	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	$ 3,352,188	$ 3,227,789