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	Sep. 30, 2023	Dec. 31, 2022
Financial Assets:
Cash and due from financial institutions	$ 50,316	$ 43,361
Other securities	34,224	33,585
Loans, net of allowance	2,719,610	2,518,155
Bank owned life insurance	54,053	53,543
Accrued interest receivable	11,489	11,178
Financial Liabilities:
Long-term FHLB advances	2,573	3,578
Other borrowings	10,964	15,516
Securities sold under agreement to repurchase	0	25,143
Carrying Amount [Member]
Financial Assets:
Cash and due from financial institutions	50,316	43,361
Other securities	34,224	33,585
Loans, held for sale	1,589	683
Loans, net of allowance	2,719,610	2,518,155
Bank owned life insurance	54,053	53,543
Accrued interest receivable	11,489	11,178
Financial Liabilities:
Nonmaturing deposits	2,139,757	2,300,215
Time deposits	655,986	319,769
Short-term FHLB advances	431,500	393,700
Long-term FHLB advances	2,573	3,578
Other borrowings	10,964	15,516
Securities sold under agreement to repurchase		25,143
Subordinated debentures	103,921	103,799
Accrued interest payable		668
Total Fair Value [Member]
Financial Assets:
Cash and due from financial institutions	50,316	43,361
Other securities	34,224	33,585
Loans, held for sale	1,589	698
Loans, net of allowance	2,627,715	2,427,291
Bank owned life insurance	54,053	53,543
Accrued interest receivable	11,489	11,178
Financial Liabilities:
Nonmaturing deposits	2,139,782	2,300,215
Time deposits	653,827	318,886
Short-term FHLB advances	430,534	393,247
Long-term FHLB advances	2,543	3,534
Other borrowings	10,964	15,806
Securities sold under agreement to repurchase		25,143
Subordinated debentures	99,264	98,513
Accrued interest payable		668
(Level 1) [Member]
Financial Assets:
Cash and due from financial institutions	50,316	43,361
Other securities	34,224	33,585
Loans, held for sale	1,589	698
Bank owned life insurance	54,053	53,543
Accrued interest receivable	11,489	11,178
Financial Liabilities:
Nonmaturing deposits	2,139,782	2,300,215
Short-term FHLB advances	430,534	393,247
Securities sold under agreement to repurchase		25,143
Accrued interest payable		668
(Level 3) [Member]
Financial Assets:
Loans, net of allowance	2,627,715	2,427,291
Financial Liabilities:
Time deposits	653,827	318,886
Long-term FHLB advances	2,543	3,534
Other borrowings	10,964	15,806
Subordinated debentures	$ 99,264	$ 98,513