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Fair Value of Financial Instruments - Estimated Fair Values and Related Carrying or Notional Amounts (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financial Assets:
Securities - available-for-sale	$ 347,516	$ 358,478
Financial Liabilities:
Subordinated notes, net of unamortized issuance costs	34,731	34,702
Dividend payable	2,975	2,974
Reported Value Measurement [Member]
Financial Assets:
Cash and cash equivalents	187,782	142,201
Interest-bearing time deposits	2,735	2,740
Securities - available-for-sale	347,516	358,478
Other securities	14,744	17,138
Loans held for sale	2,410	1,576
Loans, net	2,516,687	2,556,167
Interest receivable	12,981	11,774
Financial Liabilities:
Total Deposits	2,621,382	2,607,463
Federal funds purchased and securities sold under agreement to repurchase	28,218	28,218
Federal Home Loan Bank advances	256,628	265,750
Subordinated notes, net of unamortized issuance costs	34,731	34,702
Interest payable	5,595	5,441
Fair Value [Member]
Financial Assets:
Cash and cash equivalents	187,782	142,201
Interest-bearing time deposits	2,718	2,725
Securities - available-for-sale	347,516	358,478
Other securities	14,744	17,138
Loans held for sale	2,374	1,552
Loans, net	2,435,500	2,396,540
Interest receivable	12,981	11,774
Financial Liabilities:
Total Deposits	2,614,666	2,600,613
Federal funds purchased and securities sold under agreement to repurchase	28,218	28,218
Federal Home Loan Bank advances	254,906	260,400
Subordinated notes, net of unamortized issuance costs	29,810	30,676
Interest payable	5,595	5,441
Level 1 [Member]
Financial Assets:
Cash and cash equivalents	187,782	142,201
Securities - available-for-sale	94,218	99,900
Financial Liabilities:
Total Deposits	510,731	528,465
Level 2 [Member]
Financial Assets:
Interest-bearing time deposits	2,718	2,725
Securities - available-for-sale	251,503	256,118
Financial Liabilities:
Subordinated notes, net of unamortized issuance costs	29,810	30,676
Level 3 [Member]
Financial Assets:
Securities - available-for-sale	1,795	2,460
Other securities	14,744	17,138
Loans held for sale	2,374	1,552
Loans, net	2,435,500	2,396,540
Interest receivable	12,981	11,774
Financial Liabilities:
Total Deposits	2,103,935	2,072,148
Federal funds purchased and securities sold under agreement to repurchase	28,218	28,218
Federal Home Loan Bank advances	254,906	260,400
Interest payable	5,595	5,441
Interest Bearing Deposits [Member] | Reported Value Measurement [Member]
Financial Liabilities:
Total Deposits	1,464,666	1,415,981
Interest Bearing Deposits [Member] | Fair Value [Member]
Financial Liabilities:
Total Deposits	1,464,184	1,416,007
Interest Bearing Deposits [Member] | Level 3 [Member]
Financial Liabilities:
Total Deposits	1,464,184	1,416,007
Non Interest Bearing Deposits [Member] | Reported Value Measurement [Member]
Financial Liabilities:
Total Deposits	510,731	528,465
Non Interest Bearing Deposits [Member] | Fair Value [Member]
Financial Liabilities:
Total Deposits	510,731	528,465
Non Interest Bearing Deposits [Member] | Level 1 [Member]
Financial Liabilities:
Total Deposits	510,731	528,465
Time Deposits [Member] | Reported Value Measurement [Member]
Financial Liabilities:
Total Deposits	645,985	663,017
Time Deposits [Member] | Fair Value [Member]
Financial Liabilities:
Total Deposits	639,751	656,141
Time Deposits [Member] | Level 3 [Member]
Financial Liabilities:
Total Deposits	$ 639,751	$ 656,141

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