Loans - Past Due Status (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Loans on nonaccrual status
Total Past Due	$ 16,286,000	$ 16,861,000
Current	1,071,674,000	1,043,424,000
Total Loans	1,088,538,000	1,062,120,000
90+ days past due and accruing	732,000	324,000
Additional disclosure for nonaccrual loans
Current, nonaccrual status	431,000	458,000
Nonaccrual loans, 30-59 days past due	213,000	97,000
Nonaccrual loans, 60-89 days past due		560,000
Nonaccrual loans, 90+ days past due	867,000,000,000	1,100,000
PCI
Loans on nonaccrual status
PCI	578,000	1,835,000
30-59 Days Past Due
Loans on nonaccrual status
Total Past Due	11,510,000	12,880,000
60-89 Days Past Due
Loans on nonaccrual status
Total Past Due	3,178,000	2,568,000
90+ Days Past Due
Loans on nonaccrual status
Total Past Due	1,598,000	1,413,000
Real estate - residential mortgage
Loans on nonaccrual status
Total Past Due	1,635,000	1,258,000
Current	178,215,000	183,359,000
Total Loans	179,960,000	184,901,000
90+ days past due and accruing	318,000	9,000
Real estate - residential mortgage | PCI
Loans on nonaccrual status
PCI	110,000	284,000
Real estate - residential mortgage | 30-59 Days Past Due
Loans on nonaccrual status
Total Past Due	1,120,000	1,221,000
Real estate - residential mortgage | 60-89 Days Past Due
Loans on nonaccrual status
Total Past Due	163,000
Real estate - residential mortgage | 90+ Days Past Due
Loans on nonaccrual status
Total Past Due	352,000	37,000
Equity lines
Loans on nonaccrual status
Total Past Due	567,000	955,000
Current	51,809,000	54,615,000
Total Loans	52,411,000	55,660,000
90+ days past due and accruing	92,000
Equity lines | PCI
Loans on nonaccrual status
PCI	35,000	90,000
Equity lines | 30-59 Days Past Due
Loans on nonaccrual status
Total Past Due	73,000	46,000
Equity lines | 60-89 Days Past Due
Loans on nonaccrual status
Total Past Due	97,000	584,000
Equity lines | 90+ Days Past Due
Loans on nonaccrual status
Total Past Due	397,000	325,000
Consumer
Loans on nonaccrual status
Total Past Due	34,000	31,000
Current	13,487,000	14,978,000
Total Loans	13,521,000	15,009,000
90+ days past due and accruing	7,000
Consumer | 30-59 Days Past Due
Loans on nonaccrual status
Total Past Due	20,000	31,000
Consumer | 60-89 Days Past Due
Loans on nonaccrual status
Total Past Due	7,000
Consumer | 90+ Days Past Due
Loans on nonaccrual status
Total Past Due	7,000
Consumer finance
Loans on nonaccrual status
Total Past Due	10,926,000	14,096,000
Current	302,817,000	282,058,000
Total Loans	313,743,000	296,154,000
Consumer finance | 30-59 Days Past Due
Loans on nonaccrual status
Total Past Due	8,841,000	11,419,000
Consumer finance | 60-89 Days Past Due
Loans on nonaccrual status
Total Past Due	1,558,000	1,965,000
Consumer finance | 90+ Days Past Due
Loans on nonaccrual status
Total Past Due	527,000	712,000
Construction lending | Real estate - construction
Loans on nonaccrual status
Current	48,164,000	42,051,000
Total Loans	48,164,000	42,051,000
Consumer lot lending | Real estate - construction
Loans on nonaccrual status
Current	14,390,000	12,410,000
Total Loans	14,390,000	12,410,000
Commercial real estate lending | Commercial, financial and agricultural
Loans on nonaccrual status
Total Past Due	2,879,000	315,000
Current	309,072,000	309,057,000
Total Loans	312,384,000	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	433,000	1,461,000
Commercial real estate lending | Commercial, financial and agricultural | 30-59 Days Past Due
Loans on nonaccrual status
Total Past Due	1,331,000
Commercial real estate lending | Commercial, financial and agricultural | 60-89 Days Past Due
Loans on nonaccrual status
Total Past Due	1,233,000
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	41,241,000	43,404,000
Total Loans	41,241,000	43,404,000
Builder line lending | Commercial, financial and agricultural
Loans on nonaccrual status
Current	29,606,000	31,201,000
Total Loans	29,606,000	31,201,000
Commercial business lending | Commercial, financial and agricultural
Loans on nonaccrual status
Total Past Due	245,000	206,000
Current	82,873,000	70,291,000
Total Loans	83,118,000	70,497,000
Commercial business lending | Commercial, financial and agricultural | 30-59 Days Past Due
Loans on nonaccrual status
Total Past Due	125,000	163,000
Commercial business lending | Commercial, financial and agricultural | 60-89 Days Past Due
Loans on nonaccrual status
Total Past Due	$ 120,000	19,000
Commercial business lending | Commercial, financial and agricultural | 90+ Days Past Due
Loans on nonaccrual status
Total Past Due		$ 24,000