Fair Value of Financial Instruments - Estimated Fair Values and Related Carrying or Notional Amounts (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financial Assets:
Securities - available-for-sale	$ 413,996	$ 429,931
Financial Liabilities:
Other borrowings	40,000	40,000
Subordinated notes, net of unamortized issuance costs	34,499	34,471
Reported Value Measurement [Member]
Financial Assets:
Cash and cash equivalents	139,522	180,823
Interest-bearing time deposits	8,677	10,913
Securities - available-for-sale	413,996	429,931
Other securities	8,568	8,162
Loans held for sale	6,060	7,714
Loans, net	1,945,449	1,841,177
Interest receivable	7,961	7,209
Financial Liabilities:
Total Deposits	2,253,597	2,193,462
Federal funds purchased and securities sold under agreement to repurchase	31,680	29,268
Federal Home Loan Bank advances	22,656	24,065
Other borrowings	40,000	40,000
Subordinated notes, net of unamortized issuance costs	34,499	34,471
Interest payable	823	1,125
Fair Value [Member]
Financial Assets:
Cash and cash equivalents	139,522	180,832
Interest-bearing time deposits	8,690	10,933
Securities - available-for-sale	413,996	429,931
Other securities	8,568	8,162
Loans held for sale	6,162	7,844
Loans, net	1,969,643	1,864,386
Interest receivable	7,961	7,209
Financial Liabilities:
Total Deposits	2,254,967	2,197,543
Federal funds purchased and securities sold under agreement to repurchase	31,680	29,268
Federal Home Loan Bank advances	22,448	24,305
Other borrowings	40,000	40,000
Subordinated notes, net of unamortized issuance costs	35,000	35,000
Interest payable	823	1,125
Level 1 [Member]
Financial Assets:
Cash and cash equivalents	139,522	180,823
Securities - available-for-sale	99,545	89,177
Level 2 [Member]
Financial Assets:
Interest-bearing time deposits	8,690	10,933
Securities - available-for-sale	310,949	335,981
Financial Liabilities:
Total Deposits	497,249	473,689
Other borrowings	40,000	40,000
Subordinated notes, net of unamortized issuance costs	35,000	35,000
Level 3 [Member]
Financial Assets:
Securities - available-for-sale	3,502	4,773
Other securities	8,568	8,162
Loans held for sale	6,162	7,844
Loans, net	1,969,643	1,864,386
Interest receivable	7,961	7,209
Financial Liabilities:
Total Deposits	1,757,718	1,723,854
Federal funds purchased and securities sold under agreement to repurchase	31,680	29,268
Federal Home Loan Bank advances	22,448	24,305
Interest payable	823	1,125
Interest Bearing Deposits [Member] | Reported Value Measurement [Member]
Financial Liabilities:
Total Deposits	1,308,762	1,248,294
Interest Bearing Deposits [Member] | Fair Value [Member]
Financial Liabilities:
Total Deposits	1,306,633	1,248,044
Interest Bearing Deposits [Member] | Level 3 [Member]
Financial Liabilities:
Total Deposits	1,306,633	1,248,044
Non Interest Bearing Deposits [Member] | Reported Value Measurement [Member]
Financial Liabilities:
Total Deposits	497,249	473,689
Non Interest Bearing Deposits [Member] | Fair Value [Member]
Financial Liabilities:
Total Deposits	497,249	473,689
Non Interest Bearing Deposits [Member] | Level 2 [Member]
Financial Liabilities:
Total Deposits	497,249	473,689
Time Deposits [Member] | Reported Value Measurement [Member]
Financial Liabilities:
Total Deposits	447,586	471,479
Time Deposits [Member] | Fair Value [Member]
Financial Liabilities:
Total Deposits	451,085	475,810
Time Deposits [Member] | Level 3 [Member]
Financial Liabilities:
Total Deposits	$ 451,085	$ 475,810