Allowance for Loan Losses - Change in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Allowance balance attributable to loans:
Balance at the beginning of period	$ 34,023	$ 35,726
Provision (credited) charged to operations	6,005	7,700
Loans charged off	(10,447)	(11,993)
Recoveries of loans previously charged off	3,637	3,526
Balance at the end of period	33,218	34,959
Real estate - residential mortgage
Allowance balance attributable to loans:
Balance at the beginning of period	2,246	2,371
Provision (credited) charged to operations	(85)	(122)
Loans charged off	(46)
Recoveries of loans previously charged off	20	52
Balance at the end of period	2,135	2,301
Real estate - construction
Allowance balance attributable to loans:
Balance at the beginning of period	727	605
Provision (credited) charged to operations	77	174
Balance at the end of period	804	779
Commercial, financial and agricultural
Allowance balance attributable to loans:
Balance at the beginning of period	6,688	7,478
Provision (credited) charged to operations	103	(625)
Loans charged off	(29)	(2)
Recoveries of loans previously charged off	4	46
Balance at the end of period	6,766	6,897
Equity lines
Allowance balance attributable to loans:
Balance at the beginning of period	1,106	688
Provision (credited) charged to operations	(214)	450
Loans charged off	(19)
Balance at the end of period	873	1,138
Consumer
Allowance balance attributable to loans:
Balance at the beginning of period	257	231
Provision (credited) charged to operations	229	123
Loans charged off	(261)	(248)
Recoveries of loans previously charged off	173	174
Balance at the end of period	398	280
Consumer finance
Allowance balance attributable to loans:
Balance at the beginning of period	22,999	24,353
Provision (credited) charged to operations	5,895	7,700
Loans charged off	(10,092)	(11,743)
Recoveries of loans previously charged off	3,440	3,254
Balance at the end of period	$ 22,242	$ 23,564