Allowance for Loan Losses - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Allowance for loan losses
Loans, excluding consumer finance	$ 765,966	$ 735,784
Pass
Allowance for loan losses
Loans, excluding consumer finance	744,812	702,198
Special Mention
Allowance for loan losses
Loans, excluding consumer finance	17,851	4,611
Substandard
Allowance for loan losses
Loans, excluding consumer finance	1,802	23,664
Substandard Nonaccrual
Allowance for loan losses
Loans, excluding consumer finance	1,501	5,311
Doubtful or Loss
Allowance for loan losses
Loans, excluding consumer finance	0	0
Real estate - residential mortgage
Allowance for loan losses
Loans, excluding consumer finance	184,901	184,863
Real estate - residential mortgage | Pass
Allowance for loan losses
Loans, excluding consumer finance	180,232	179,963
Real estate - residential mortgage | Special Mention
Allowance for loan losses
Loans, excluding consumer finance	2,832	1,235
Real estate - residential mortgage | Substandard
Allowance for loan losses
Loans, excluding consumer finance	1,243	2,835
Real estate - residential mortgage | Substandard Nonaccrual
Allowance for loan losses
Loans, excluding consumer finance	594	830
Real estate - construction | Construction Lending
Allowance for loan losses
Loans, excluding consumer finance	42,051	41,449
Real estate - construction | Construction Lending | Pass
Allowance for loan losses
Loans, excluding consumer finance	42,051	41,449
Real estate - construction | Consumer lot lending
Allowance for loan losses
Loans, excluding consumer finance	12,410	3,333
Real estate - construction | Consumer lot lending | Pass
Allowance for loan losses
Loans, excluding consumer finance	12,410	3,333
Commercial, financial and agricultural | Commercial real estate lending
Allowance for loan losses
Loans, excluding consumer finance	310,833	304,490
Commercial, financial and agricultural | Commercial real estate lending | Pass
Allowance for loan losses
Loans, excluding consumer finance	306,578	293,292
Commercial, financial and agricultural | Commercial real estate lending | Special Mention
Allowance for loan losses
Loans, excluding consumer finance	3,801	2,874
Commercial, financial and agricultural | Commercial real estate lending | Substandard
Allowance for loan losses
Loans, excluding consumer finance	454	4,528
Commercial, financial and agricultural | Commercial real estate lending | Substandard Nonaccrual
Allowance for loan losses
Loans, excluding consumer finance		3,796
Commercial, financial and agricultural | Land acquisition and development lending
Allowance for loan losses
Loans, excluding consumer finance	43,404	39,844
Commercial, financial and agricultural | Land acquisition and development lending | Pass
Allowance for loan losses
Loans, excluding consumer finance	33,156	24,253
Commercial, financial and agricultural | Land acquisition and development lending | Special Mention
Allowance for loan losses
Loans, excluding consumer finance	10,248
Commercial, financial and agricultural | Land acquisition and development lending | Substandard
Allowance for loan losses
Loans, excluding consumer finance		15,591
Commercial, financial and agricultural | Builder line lending
Allowance for loan losses
Loans, excluding consumer finance	31,201	29,596
Commercial, financial and agricultural | Builder line lending | Pass
Allowance for loan losses
Loans, excluding consumer finance	31,201	29,596
Commercial, financial and agricultural | Commercial business lending
Allowance for loan losses
Loans, excluding consumer finance	70,497	63,954
Commercial, financial and agricultural | Commercial business lending | Pass
Allowance for loan losses
Loans, excluding consumer finance	69,897	63,749
Commercial, financial and agricultural | Commercial business lending | Special Mention
Allowance for loan losses
Loans, excluding consumer finance	576	34
Commercial, financial and agricultural | Commercial business lending | Substandard
Allowance for loan losses
Loans, excluding consumer finance		137
Commercial, financial and agricultural | Commercial business lending | Substandard Nonaccrual
Allowance for loan losses
Loans, excluding consumer finance	24	34
Equity lines
Allowance for loan losses
Loans, excluding consumer finance	55,660	55,237
Equity lines | Pass
Allowance for loan losses
Loans, excluding consumer finance	54,289	53,870
Equity lines | Special Mention
Allowance for loan losses
Loans, excluding consumer finance	389	465
Equity lines | Substandard
Allowance for loan losses
Loans, excluding consumer finance	99	251
Equity lines | Substandard Nonaccrual
Allowance for loan losses
Loans, excluding consumer finance	883	651
Consumer Loan
Allowance for loan losses
Loans, excluding consumer finance	15,009	13,018
Consumer Loan | Pass
Allowance for loan losses
Loans, excluding consumer finance	14,998	12,693
Consumer Loan | Special Mention
Allowance for loan losses
Loans, excluding consumer finance	5	3
Consumer Loan | Substandard
Allowance for loan losses
Loans, excluding consumer finance	$ 6	$ 322