Allowance for Loan Losses - Change in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Allowance balance attributable to loans:
Balance at the beginning of period	$ 32,873	$ 34,023
Provision charged to operations	6,250	4,205
Loans charged off	(5,577)	(7,202)
Recoveries of loans previously charged off	2,548	2,375
Balance at the end of period	36,094	33,401
Real estate - residential mortgage
Allowance balance attributable to loans:
Balance at the beginning of period	2,080	2,246
Provision charged to operations	285	(68)
Loans charged off	(4)	(45)
Recoveries of loans previously charged off	64	9
Balance at the end of period	2,425	2,142
Real estate - construction
Allowance balance attributable to loans:
Balance at the beginning of period	681	727
Provision charged to operations	302	23
Balance at the end of period	983	750
Commercial, financial and agricultural
Allowance balance attributable to loans:
Balance at the beginning of period	7,121	6,688
Provision charged to operations	1,724	218
Loans charged off	(18)	(29)
Recoveries of loans previously charged off	2	3
Balance at the end of period	8,829	6,880
Equity lines
Allowance balance attributable to loans:
Balance at the beginning of period	733	1,106
Provision charged to operations	56	(225)
Balance at the end of period	789	881
Consumer
Allowance balance attributable to loans:
Balance at the beginning of period	465	257
Provision charged to operations	33	162
Loans charged off	(133)	(162)
Recoveries of loans previously charged off	105	115
Balance at the end of period	470	372
Consumer finance
Allowance balance attributable to loans:
Balance at the beginning of period	21,793	22,999
Provision charged to operations	3,850	4,095
Loans charged off	(5,422)	(6,966)
Recoveries of loans previously charged off	2,377	2,248
Balance at the end of period	$ 22,598	$ 22,376