Fair Value of Financial Instruments - Estimated Fair Values and Related Carrying or Notional Amounts (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financial Assets:
Securities - available-for-sale	$ 438,568	$ 426,556
Financial Liabilities:
Subordinated notes, net of unamortized issuance costs	34,846	34,818
Dividend payable	2,997	2,996
Reported Value Measurement [Member]
Financial Assets:
Cash and cash equivalents	173,037	176,351
Interest-bearing time deposits	1,992	2,482
Other securities	14,062	14,400
Loans held for sale	2,331	2,996
Loans, net	2,555,552	2,536,043
Interest receivable	13,002	12,657
Financial Liabilities:
Total Deposits	2,700,284	2,686,765
Federal funds purchased and securities sold under agreement to repurchase	27,258	27,218
Federal Home Loan Bank advances	245,474	246,056
Subordinated notes, net of unamortized issuance costs	34,846	34,818
Interest payable	6,142	6,618
Fair Value [Member]
Financial Assets:
Cash and cash equivalents	173,037	176,351
Interest-bearing time deposits	2,000	2,472
Other securities	14,062	14,400
Loans held for sale	2,331	2,996
Loans, net	2,512,106	2,485,297
Interest receivable	13,002	12,657
Financial Liabilities:
Total Deposits	2,698,577	2,682,850
Federal funds purchased and securities sold under agreement to repurchase	27,258	27,218
Federal Home Loan Bank advances	245,352	245,373
Subordinated notes, net of unamortized issuance costs	32,693	31,983
Interest payable	6,142	6,618
Level 1 [Member]
Financial Assets:
Cash and cash equivalents	173,037	176,351
Financial Liabilities:
Total Deposits	502,318	516,904
Level 2 [Member]
Financial Assets:
Interest-bearing time deposits	2,000	2,472
Financial Liabilities:
Total Deposits	0
Subordinated notes, net of unamortized issuance costs	32,693	31,983
Level 3 [Member]
Financial Assets:
Other securities	14,062	14,400
Loans held for sale	2,331	2,996
Loans, net	2,512,106	2,485,297
Interest receivable	13,002	12,657
Financial Liabilities:
Total Deposits	2,196,259	2,165,946
Federal funds purchased and securities sold under agreement to repurchase	27,258	27,218
Federal Home Loan Bank advances	245,352	245,373
Interest payable	6,142	6,618
Non Interest Bearing Deposits [Member] | Reported Value Measurement [Member]
Financial Liabilities:
Total Deposits	502,318	516,904
Non Interest Bearing Deposits [Member] | Fair Value [Member]
Financial Liabilities:
Total Deposits	502,318	516,904
Non Interest Bearing Deposits [Member] | Level 1 [Member]
Financial Liabilities:
Total Deposits	502,318	516,904
Interest Bearing Deposits [Member] | Reported Value Measurement [Member]
Financial Liabilities:
Total Deposits	1,571,516	1,522,280
Interest Bearing Deposits [Member] | Fair Value [Member]
Financial Liabilities:
Total Deposits	1,571,919	1,521,097
Interest Bearing Deposits [Member] | Level 3 [Member]
Financial Liabilities:
Total Deposits	1,571,919	1,521,097
Time Deposits [Member] | Reported Value Measurement [Member]
Financial Liabilities:
Total Deposits	626,450	647,581
Time Deposits [Member] | Fair Value [Member]
Financial Liabilities:
Total Deposits	624,340	644,849
Time Deposits [Member] | Level 3 [Member]
Financial Liabilities:
Total Deposits	$ 624,340	$ 644,849