Fair Value Measurement - Carrying Amount and Fair Value of Financial Instruments Not Measured at Fair Value on a Recurring or Nonrecurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financial Assets:
Cash and due from financial institutions	$ 50,310	$ 60,406
Other securities	31,360	29,998
Loans, net of allowance	2,859,290	2,824,568
Bank owned life insurance	61,685	61,335
Accrued interest receivable	13,513	12,819
Financial Liabilities:
Long-term FHLB advances	2,211	2,392
Other borrowings	8,105	9,859
Carrying Amount [Member]
Financial Assets:
Cash and due from financial institutions	50,310	60,406
Other securities	31,360	29,998
Loans, held for sale	3,716	1,725
Loans, net of allowance	2,859,290	2,824,568
Bank owned life insurance	61,685	61,335
Accrued interest receivable	13,513	12,819
Financial Liabilities:
Nonmaturing deposits	2,071,809	2,084,216
Time deposits	908,886	900,812
Short-term FHLB advances	368,500	338,000
Long-term FHLB advances	2,211	2,392
Other borrowings	8,105	9,859
Subordinated debentures	103,984	103,943
Accrued interest payable	6,289	9,525
Total Fair Value [Member]
Financial Assets:
Cash and due from financial institutions	50,310	60,406
Other securities	31,360	29,998
Loans, held for sale	3,716	1,725
Loans, net of allowance	2,735,265	2,679,988
Bank owned life insurance	61,685	61,335
Accrued interest receivable	13,513	12,819
Financial Liabilities:
Nonmaturing deposits	2,071,684	2,084,216
Time deposits	907,775	899,443
Short-term FHLB advances	367,698	337,267
Long-term FHLB advances	2,098	2,419
Other borrowings	8,105	9,859
Subordinated debentures	103,287	101,563
Accrued interest payable	6,289	9,525
(Level 1) [Member]
Financial Assets:
Cash and due from financial institutions	50,310	60,406
Other securities	31,360	29,998
Loans, held for sale	3,716	1,725
Bank owned life insurance	61,685	61,335
Accrued interest receivable	13,513	12,819
Financial Liabilities:
Nonmaturing deposits	2,071,684	2,084,216
Short-term FHLB advances	367,698	337,267
Accrued interest payable	6,289	9,525
(Level 3) [Member]
Financial Assets:
Loans, net of allowance	2,735,265	2,679,988
Financial Liabilities:
Time deposits	907,775	899,443
Long-term FHLB advances	2,098	2,419
Other borrowings	8,105	15,806
Subordinated debentures	$ 103,287	$ 101,563