Allowance for Loan Losses - Change in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Allowance balance attributable to loans:
Balance at the beginning of period	$ 34,023	$ 35,726
Provision charged to operations	2,395	3,300
Loans charged off	(3,966)	(4,656)
Recoveries of loans previously charged off	1,137	1,230
Balance at the end of period	33,589	35,600
Real estate - residential mortgage
Allowance balance attributable to loans:
Balance at the beginning of period	2,246	2,371
Provision charged to operations	(47)	(16)
Recoveries of loans previously charged off	5	22
Balance at the end of period	2,204	2,377
Real estate - construction
Allowance balance attributable to loans:
Balance at the beginning of period	727	605
Provision charged to operations	114	251
Balance at the end of period	841	856
Commercial, financial and agricultural
Allowance balance attributable to loans:
Balance at the beginning of period	6,688	7,478
Provision charged to operations	(25)	(238)
Loans charged off		(2)
Recoveries of loans previously charged off	1	5
Balance at the end of period	6,664	7,243
Equity lines
Allowance balance attributable to loans:
Balance at the beginning of period	1,106	688
Provision charged to operations	(205)
Balance at the end of period	901	688
Consumer
Allowance balance attributable to loans:
Balance at the beginning of period	257	231
Provision charged to operations	163	3
Loans charged off	(76)	(71)
Recoveries of loans previously charged off	42	48
Balance at the end of period	386	211
Consumer Finance
Allowance balance attributable to loans:
Balance at the beginning of period	22,999	24,353
Provision charged to operations	2,395	3,300
Loans charged off	(3,890)	(4,583)
Recoveries of loans previously charged off	1,089	1,155
Balance at the end of period	$ 22,593	$ 24,225