Loans and Allowance for Loan Losses - Allocation of ALL with Corresponding Percentage of Loans in Each Category to Total Loans, Net of Deferred Fee (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan and leases losses, Amount	$ 20,857	$ 21,698	$ 23,877	$ 23,245
Allowance for loan and lease losses, Percentage of total loans	1.02%	1.10%
Commercial real estate
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan and leases losses, Amount	$ 6,987	$ 7,124	7,688	7,349
Allowance for loan and lease losses, Percentage of total loans	0.34%	0.36%
Consumer real estate
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan and leases losses, Amount	$ 2,214	$ 2,412	1,679	1,831
Allowance for loan and lease losses, Percentage of total loans	0.11%	0.12%
Construction and land development
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan and leases losses, Amount	$ 3,308	$ 3,769	3,363	3,476
Allowance for loan and lease losses, Percentage of total loans	0.16%	0.19%
Commercial and industrial
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan and leases losses, Amount	$ 7,206	$ 7,441	10,212	9,708
Allowance for loan and lease losses, Percentage of total loans	0.35%	0.38%
Consumer
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan and leases losses, Amount	$ 381	$ 397	333	305
Allowance for loan and lease losses, Percentage of total loans	0.02%	0.02%
Other
Loans And Leases Receivable Disclosure [Line Items]
Allowance for loan and leases losses, Amount	$ 761	$ 555	$ 602	$ 576
Allowance for loan and lease losses, Percentage of total loans	0.04%	0.03%