Allowance for Loan Losses - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Allowance for loan losses
Loans, excluding consumer finance	$ 782,326	$ 765,966
Loans	1,090,335	1,062,120
Pass
Allowance for loan losses
Loans, excluding consumer finance	764,723	744,812
Special Mention
Allowance for loan losses
Loans, excluding consumer finance	14,909	17,851
Substandard
Allowance for loan losses
Loans, excluding consumer finance	1,666	1,802
Substandard Nonaccrual
Allowance for loan losses
Loans, excluding consumer finance	1,028	1,501
Real estate - residential mortgage
Allowance for loan losses
Loans, excluding consumer finance	182,981	184,901
Loans	182,981	184,901
Real estate - residential mortgage | Pass
Allowance for loan losses
Loans, excluding consumer finance	179,536	180,232
Real estate - residential mortgage | Special Mention
Allowance for loan losses
Loans, excluding consumer finance	1,654	2,832
Real estate - residential mortgage | Substandard
Allowance for loan losses
Loans, excluding consumer finance	1,206	1,243
Real estate - residential mortgage | Substandard Nonaccrual
Allowance for loan losses
Loans, excluding consumer finance	585	594
Real estate - construction
Allowance for loan losses
Loans	58,372	54,461
Real estate - construction | Construction Lending
Allowance for loan losses
Loans, excluding consumer finance	46,324	42,051
Real estate - construction | Construction Lending | Pass
Allowance for loan losses
Loans, excluding consumer finance	46,324	42,051
Real estate - construction | Consumer lot lending
Allowance for loan losses
Loans, excluding consumer finance	12,048	12,410
Real estate - construction | Consumer lot lending | Pass
Allowance for loan losses
Loans, excluding consumer finance	12,048	12,410
Commercial, financial and agricultural
Allowance for loan losses
Loans	474,087	455,935
Commercial, financial and agricultural | Commercial real estate lending
Allowance for loan losses
Loans, excluding consumer finance	315,769	310,833
Commercial, financial and agricultural | Commercial real estate lending | Pass
Allowance for loan losses
Loans, excluding consumer finance	312,591	306,578
Commercial, financial and agricultural | Commercial real estate lending | Special Mention
Allowance for loan losses
Loans, excluding consumer finance	2,756	3,801
Commercial, financial and agricultural | Commercial real estate lending | Substandard
Allowance for loan losses
Loans, excluding consumer finance	422	454
Commercial, financial and agricultural | Land acquisition and development lending
Allowance for loan losses
Loans, excluding consumer finance	43,515	43,404
Commercial, financial and agricultural | Land acquisition and development lending | Pass
Allowance for loan losses
Loans, excluding consumer finance	34,040	33,156
Commercial, financial and agricultural | Land acquisition and development lending | Special Mention
Allowance for loan losses
Loans, excluding consumer finance	9,475	10,248
Commercial, financial and agricultural | Builder line lending
Allowance for loan losses
Loans, excluding consumer finance	34,348	31,201
Commercial, financial and agricultural | Builder line lending | Pass
Allowance for loan losses
Loans, excluding consumer finance	34,348	31,201
Commercial, financial and agricultural | Commercial business lending
Allowance for loan losses
Loans, excluding consumer finance	80,455	70,497
Commercial, financial and agricultural | Commercial business lending | Pass
Allowance for loan losses
Loans, excluding consumer finance	79,759	69,897
Commercial, financial and agricultural | Commercial business lending | Special Mention
Allowance for loan losses
Loans, excluding consumer finance	696	576
Commercial, financial and agricultural | Commercial business lending | Substandard Nonaccrual
Allowance for loan losses
Loans, excluding consumer finance		24
Equity lines
Allowance for loan losses
Loans, excluding consumer finance	53,741	55,660
Loans	53,741	55,660
Equity lines | Pass
Allowance for loan losses
Loans, excluding consumer finance	53,069	54,289
Equity lines | Special Mention
Allowance for loan losses
Loans, excluding consumer finance	320	389
Equity lines | Substandard
Allowance for loan losses
Loans, excluding consumer finance	30	99
Equity lines | Substandard Nonaccrual
Allowance for loan losses
Loans, excluding consumer finance	322	883
Consumer
Allowance for loan losses
Loans, excluding consumer finance	13,145	15,009
Loans	13,145	15,009
Consumer | Pass
Allowance for loan losses
Loans, excluding consumer finance	13,008	14,998
Consumer | Special Mention
Allowance for loan losses
Loans, excluding consumer finance	8	5
Consumer | Substandard
Allowance for loan losses
Loans, excluding consumer finance	8	$ 6
Consumer | Substandard Nonaccrual
Allowance for loan losses
Loans, excluding consumer finance	$ 121