Loans and Allowance for Loan Losses - Collateral Loan (Details) - USD ($) $ in Thousands	Mar. 31, 2023		Dec. 31, 2022		Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held for investment	$ 1,542,074		$ 1,521,252
Allowance Allocated	21,979	[1]	15,588	[1]	$ 14,279	$ 16,903
Commercial, Financial, and Agricultural
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held for investment	227,992		244,549
Allowance Allocated	1,921		2,735		2,830	2,717
Real Estate Mortgage - Residential
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held for investment	363,634		361,025
Allowance Allocated	5,262		3,329		2,578	2,482
Real Estate Mortgage - Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held for investment	725,573		722,729
Allowance Allocated	9,487		$ 8,000		$ 7,692	$ 10,662
Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held for investment	18,377
Real Estate | Commercial, Financial, and Agricultural
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held for investment	0
Real Estate | Real Estate Mortgage - Residential
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held for investment	149
Real Estate | Real Estate Mortgage - Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held for investment	18,228
Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held for investment	50
Other | Commercial, Financial, and Agricultural
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held for investment	50
Other | Real Estate Mortgage - Residential
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held for investment	0
Other | Real Estate Mortgage - Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held for investment	0
Allowance Allocated
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Allocated	63
Allowance Allocated | Commercial, Financial, and Agricultural
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Allocated	0
Allowance Allocated | Real Estate Mortgage - Residential
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Allocated	63
Allowance Allocated | Real Estate Mortgage - Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Allocated	$ 0

[1] March 31, 2023 amounts include the impacts of the January 1, 2023 adoption of ASU 2013-13. See Note 2 for details.See accompanying notes to the consolidated financial statements (unaudited)