Allowance for Loan Losses - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Allowance for loan losses
Loans, excluding consumer finance	$ 1,054,371	$ 1,040,154
Pass
Allowance for loan losses
Loans, excluding consumer finance	1,025,632	1,004,998
Special Mention
Allowance for loan losses
Loans, excluding consumer finance	17,874	20,526
Substandard
Allowance for loan losses
Loans, excluding consumer finance	7,952	11,628
Substandard Nonaccrual
Allowance for loan losses
Loans, excluding consumer finance	2,913	3,002
Real estate - residential mortgage
Allowance for loan losses
Loans, excluding consumer finance	218,189	218,298
Real estate - residential mortgage | Pass
Allowance for loan losses
Loans, excluding consumer finance	216,599	215,712
Real estate - residential mortgage | Special Mention
Allowance for loan losses
Loans, excluding consumer finance	864	1,715
Real estate - residential mortgage | Substandard
Allowance for loan losses
Loans, excluding consumer finance	455	595
Real estate - residential mortgage | Substandard Nonaccrual
Allowance for loan losses
Loans, excluding consumer finance	271	276
Real estate - construction | Construction lending
Allowance for loan losses
Loans, excluding consumer finance	38,729	49,659
Real estate - construction | Construction lending | Pass
Allowance for loan losses
Loans, excluding consumer finance	38,729	49,659
Real estate - construction | Consumer lot lending
Allowance for loan losses
Loans, excluding consumer finance	15,192	12,488
Real estate - construction | Consumer lot lending | Pass
Allowance for loan losses
Loans, excluding consumer finance	15,192	12,488
Commercial, financial and agricultural | Commercial real estate lending
Allowance for loan losses
Loans, excluding consumer finance	482,214	441,903
Commercial, financial and agricultural | Commercial real estate lending | Pass
Allowance for loan losses
Loans, excluding consumer finance	459,231	415,506
Commercial, financial and agricultural | Commercial real estate lending | Special Mention
Allowance for loan losses
Loans, excluding consumer finance	15,487	15,507
Commercial, financial and agricultural | Commercial real estate lending | Substandard
Allowance for loan losses
Loans, excluding consumer finance	7,496	10,890
Commercial, financial and agricultural | Land acquisition and development lending
Allowance for loan losses
Loans, excluding consumer finance	31,671	37,724
Commercial, financial and agricultural | Land acquisition and development lending | Pass
Allowance for loan losses
Loans, excluding consumer finance	31,671	37,724
Commercial, financial and agricultural | Builder line lending
Allowance for loan losses
Loans, excluding consumer finance	28,233	18,194
Commercial, financial and agricultural | Builder line lending | Pass
Allowance for loan losses
Loans, excluding consumer finance	28,233	18,194
Commercial, financial and agricultural | Commercial business lending
Allowance for loan losses
Loans, excluding consumer finance	188,059	202,394
Commercial, financial and agricultural | Commercial business lending | Pass
Allowance for loan losses
Loans, excluding consumer finance	184,404	196,743
Commercial, financial and agricultural | Commercial business lending | Special Mention
Allowance for loan losses
Loans, excluding consumer finance	1,306	3,124
Commercial, financial and agricultural | Commercial business lending | Substandard
Allowance for loan losses
Loans, excluding consumer finance		99
Commercial, financial and agricultural | Commercial business lending | Substandard Nonaccrual
Allowance for loan losses
Loans, excluding consumer finance	2,349	2,428
Equity lines
Allowance for loan losses
Loans, excluding consumer finance	43,782	48,466
Equity lines | Pass
Allowance for loan losses
Loans, excluding consumer finance	43,418	48,140
Equity lines | Special Mention
Allowance for loan losses
Loans, excluding consumer finance	176	132
Equity lines | Substandard
Allowance for loan losses
Loans, excluding consumer finance	1	3
Equity lines | Substandard Nonaccrual
Allowance for loan losses
Loans, excluding consumer finance	187	191
Consumer
Allowance for loan losses
Loans, excluding consumer finance	8,302	11,028
Consumer | Pass
Allowance for loan losses
Loans, excluding consumer finance	8,155	10,832
Consumer | Special Mention
Allowance for loan losses
Loans, excluding consumer finance	41	48
Consumer | Substandard
Allowance for loan losses
Loans, excluding consumer finance		41
Consumer | Substandard Nonaccrual
Allowance for loan losses
Loans, excluding consumer finance	$ 106	$ 107