Allowance for Loan Losses - Change in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Allowance balance attributable to loans:
Balance at the beginning of period	$ 32,873	$ 34,023
Provision charged (credited) to operations	9,550	6,005
Loans charged off	(7,206)	(10,447)
Recoveries of loans previously charged off	3,639	3,637
Balance at the end of period	38,856	33,218
Real estate - residential mortgage
Allowance balance attributable to loans:
Balance at the beginning of period	2,080	2,246
Provision charged (credited) to operations	337	(85)
Loans charged off	(9)	(46)
Recoveries of loans previously charged off	79	20
Balance at the end of period	2,487	2,135
Real estate - construction
Allowance balance attributable to loans:
Balance at the beginning of period	681	727
Provision charged (credited) to operations	232	77
Balance at the end of period	913	804
Commercial, financial and agricultural
Allowance balance attributable to loans:
Balance at the beginning of period	7,121	6,688
Provision charged (credited) to operations	3,446	103
Loans charged off	(18)	(29)
Recoveries of loans previously charged off	3	4
Balance at the end of period	10,552	6,766
Equity lines
Allowance balance attributable to loans:
Balance at the beginning of period	733	1,106
Provision charged (credited) to operations	(78)	(214)
Loans charged off		(19)
Balance at the end of period	655	873
Consumer
Allowance balance attributable to loans:
Balance at the beginning of period	465	257
Provision charged (credited) to operations	(37)	229
Loans charged off	(174)	(261)
Recoveries of loans previously charged off	135	173
Balance at the end of period	389	398
Consumer finance
Allowance balance attributable to loans:
Balance at the beginning of period	21,793	22,999
Provision charged (credited) to operations	5,650	5,895
Loans charged off	(7,005)	(10,092)
Recoveries of loans previously charged off	3,422	3,440
Balance at the end of period	$ 23,860	$ 22,242