Loans - Past Due Status (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Loans on nonaccrual status
Total Past Due	$ 10,613,000	$ 16,861,000
Current	1,063,169,000	1,043,424,000
Total Loans	1,075,641,000	1,062,120,000
90+ days past due and accruing	328,000	324,000
Additional disclosure for nonaccrual loans
Current, nonaccrual status	616,000	458,000
Nonaccrual loans, 30-59 days past due	90,000	97,000
Nonaccrual loans, 60-89 days past due	122,000	560,000
Nonaccrual loans, 90+ days past due	1,310,000	1,100,000
PCI
Loans on nonaccrual status
PCI	1,859,000	1,835,000
30-59 Days Past Due
Loans on nonaccrual status
Total Past Due	8,002,000	12,880,000
60-89 Days Past Due
Loans on nonaccrual status
Total Past Due	992,000	2,568,000
90+ Days Past Due
Loans on nonaccrual status
Total Past Due	1,619,000	1,413,000
Real estate - residential mortgage
Loans on nonaccrual status
Total Past Due	1,105,000	1,258,000
Current	182,312,000	183,359,000
Total Loans	183,697,000	184,901,000
90+ days past due and accruing	6,000	9,000
Real estate - residential mortgage | PCI
Loans on nonaccrual status
PCI	280,000	284,000
Real estate - residential mortgage | 30-59 Days Past Due
Loans on nonaccrual status
Total Past Due	969,000	1,221,000
Real estate - residential mortgage | 90+ Days Past Due
Loans on nonaccrual status
Total Past Due	136,000	37,000
Equity lines
Loans on nonaccrual status
Total Past Due	1,040,000	955,000
Current	52,981,000	54,615,000
Total Loans	54,111,000	55,660,000
Equity lines | PCI
Loans on nonaccrual status
PCI	90,000	90,000
Equity lines | 30-59 Days Past Due
Loans on nonaccrual status
Total Past Due	299,000	46,000
Equity lines | 60-89 Days Past Due
Loans on nonaccrual status
Total Past Due	122,000	584,000
Equity lines | 90+ Days Past Due
Loans on nonaccrual status
Total Past Due	619,000	325,000
Consumer
Loans on nonaccrual status
Total Past Due	52,000	31,000
Current	12,781,000	14,978,000
Total Loans	12,833,000	15,009,000
90+ days past due and accruing	7,000
Consumer | 30-59 Days Past Due
Loans on nonaccrual status
Total Past Due	52,000	31,000
Consumer Finance
Loans on nonaccrual status
Total Past Due	7,963,000	14,096,000
Current	291,629,000	282,058,000
Total Loans	299,592,000	296,154,000
Consumer Finance | 30-59 Days Past Due
Loans on nonaccrual status
Total Past Due	6,573,000	11,419,000
Consumer Finance | 60-89 Days Past Due
Loans on nonaccrual status
Total Past Due	870,000	1,965,000
Consumer Finance | 90+ Days Past Due
Loans on nonaccrual status
Total Past Due	520,000	712,000
Construction Lending | Real estate - construction
Loans on nonaccrual status
Current	53,319,000	42,051,000
Total Loans	53,319,000	42,051,000
Consumer lot lending | Real estate - construction
Loans on nonaccrual status
Current	12,269,000	12,410,000
Total Loans	12,269,000	12,410,000
Commercial real estate lending | Commercial, financial and agricultural
Loans on nonaccrual status
Total Past Due	379,000	315,000
Current	301,212,000	309,057,000
Total Loans	303,080,000	310,833,000
90+ days past due and accruing	315,000	315,000
Commercial real estate lending | Commercial, financial and agricultural | PCI
Loans on nonaccrual status
PCI	1,489,000	1,461,000
Commercial real estate lending | Commercial, financial and agricultural | 30-59 Days Past Due
Loans on nonaccrual status
Total Past Due	64,000
Commercial real estate lending | Commercial, financial and agricultural | 90+ Days Past Due
Loans on nonaccrual status
Total Past Due	315,000	315,000
Land acquisition and development lending | Commercial, financial and agricultural
Loans on nonaccrual status
Current	45,245,000	43,404,000
Total Loans	45,245,000	43,404,000
Builder line lending | Commercial, financial and agricultural
Loans on nonaccrual status
Current	29,180,000	31,201,000
Total Loans	29,180,000	31,201,000
Commercial business lending | Commercial, financial and agricultural
Loans on nonaccrual status
Total Past Due	74,000	206,000
Current	82,241,000	70,291,000
Total Loans	82,315,000	70,497,000
Commercial business lending | Commercial, financial and agricultural | 30-59 Days Past Due
Loans on nonaccrual status
Total Past Due	45,000	163,000
Commercial business lending | Commercial, financial and agricultural | 60-89 Days Past Due
Loans on nonaccrual status
Total Past Due		19,000
Commercial business lending | Commercial, financial and agricultural | 90+ Days Past Due
Loans on nonaccrual status
Total Past Due	$ 29,000	$ 24,000