Allowance for Loan Losses - Change in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Allowance balance attributable to loans:
Balance at the beginning of period	$ 34,023	$ 35,726
Provision charged to operations	4,205	5,300
Loans charged off	(7,202)	(8,083)
Recoveries of loans previously charged off	2,375	2,450
Balance at the end of period	33,401	35,393
Real estate - residential mortgage
Allowance balance attributable to loans:
Balance at the beginning of period	2,246	2,371
Provision charged to operations	(68)	(108)
Loans charged off	(45)
Recoveries of loans previously charged off	9	35
Balance at the end of period	2,142	2,298
Real estate - construction
Allowance balance attributable to loans:
Balance at the beginning of period	727	605
Provision charged to operations	23	340
Balance at the end of period	750	945
Commercial, financial and agricultural
Allowance balance attributable to loans:
Balance at the beginning of period	6,688	7,478
Provision charged to operations	218	(520)
Loans charged off	(29)	(2)
Recoveries of loans previously charged off	3	22
Balance at the end of period	6,880	6,978
Equity lines
Allowance balance attributable to loans:
Balance at the beginning of period	1,106	688
Provision charged to operations	(225)	229
Balance at the end of period	881	917
Consumer
Allowance balance attributable to loans:
Balance at the beginning of period	257	231
Provision charged to operations	162	59
Loans charged off	(162)	(133)
Recoveries of loans previously charged off	115	95
Balance at the end of period	372	252
Consumer Finance
Allowance balance attributable to loans:
Balance at the beginning of period	22,999	24,353
Provision charged to operations	4,095	5,300
Loans charged off	(6,966)	(7,948)
Recoveries of loans previously charged off	2,248	2,298
Balance at the end of period	$ 22,376	$ 24,003