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Fair Value of Financial Instruments - Estimated Fair Values and Related Carrying or Notional Amounts (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financial Assets:
Securities - available-for-sale	$ 426,717	$ 307,812
Financial Liabilities:
Subordinated notes, net of unamortized issuance costs	34,441
Reported Value Measurement [Member]
Financial Assets:
Cash and cash equivalents	158,078	175,706
Interest-bearing time deposits	14,622	4,653
Securities - available-for-sale	426,717	307,812
Other securities	4,905	5,939
Loans held for sale	3,735	7,740
Loans, net	1,479,864	1,289,318
Interest receivable	7,401	6,188
Financial Liabilities:
Total Deposits	1,866,228	1,596,162
Federal funds purchased and securities sold under agreement to repurchase	29,601	30,239
Federal Home Loan Bank advances	17,868	17,861
Subordinated notes, net of unamortized issuance costs	34,441
Interest payable	588	338
Fair Value [Member]
Financial Assets:
Cash and cash equivalents	158,078	175,706
Interest-bearing time deposits	14,651	4,677
Securities - available-for-sale	426,717	307,812
Other securities	4,905	5,939
Loans held for sale	3,735	7,740
Loans, net	1,434,960	1,261,440
Interest receivable	7,401	6,188
Financial Liabilities:
Total Deposits	1,862,291	1,605,890
Federal funds purchased and securities sold under agreement to repurchase	29,601	30,239
Federal Home Loan Bank advances	17,869	17,872
Subordinated notes, net of unamortized issuance costs	35,000
Interest payable	588	338
Interest Bearing Deposits [Member] | Reported Value Measurement [Member]
Financial Liabilities:
Total Deposits	1,175,769	997,462
Interest Bearing Deposits [Member] | Fair Value [Member]
Financial Liabilities:
Total Deposits	1,175,816	1,004,608
Non Interest Bearing Deposits [Member] | Reported Value Measurement [Member]
Financial Liabilities:
Total Deposits	438,076	351,147
Non Interest Bearing Deposits [Member] | Fair Value [Member]
Financial Liabilities:
Total Deposits	438,076	351,147
Time Deposits [Member] | Reported Value Measurement [Member]
Financial Liabilities:
Total Deposits	252,383	247,553
Time Deposits [Member] | Fair Value [Member]
Financial Liabilities:
Total Deposits	248,399	250,135
Level 1 [Member]
Financial Assets:
Cash and cash equivalents	158,078	175,706
Securities - available-for-sale	73,804
Level 2 [Member]
Financial Assets:
Interest-bearing time deposits	14,651	4,677
Securities - available-for-sale	349,146	306,250
Financial Liabilities:
Total Deposits	438,076	351,147
Subordinated notes, net of unamortized issuance costs	35,000
Level 2 [Member] | Non Interest Bearing Deposits [Member]
Financial Liabilities:
Total Deposits	438,076	351,147
Level 3 [Member]
Financial Assets:
Securities - available-for-sale	3,767	1,562
Other securities	4,905	5,939
Loans held for sale	3,735	7,740
Loans, net	1,434,960	1,261,440
Interest receivable	7,401	6,188
Financial Liabilities:
Total Deposits	1,424,215	1,254,743
Federal funds purchased and securities sold under agreement to repurchase	29,601	30,239
Federal Home Loan Bank advances	17,869	17,872
Interest payable	588	338
Level 3 [Member] | Interest Bearing Deposits [Member]
Financial Liabilities:
Total Deposits	1,175,816	1,004,608
Level 3 [Member] | Time Deposits [Member]
Financial Liabilities:
Total Deposits	$ 248,399	$ 250,135

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