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Allowance for Loan Losses - Change in Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance balance attributable to loans:      
Balance at the beginning of period $ 32,873 $ 34,023 $ 35,726
Provision charged to operations 11,080 8,515 11,006
Loans charged off (9,642) (14,553) (17,272)
Recoveries of loans previously charged off 4,845 4,888 4,563
Balance at the end of period 39,156 32,873 34,023
Real estate - residential mortgage      
Allowance balance attributable to loans:      
Balance at the beginning of period 2,080 2,246 2,371
Provision charged to operations 808 (146) (140)
Loans charged off (62) (46) (42)
Recoveries of loans previously charged off 88 26 57
Balance at the end of period 2,914 2,080 2,246
Real estate - construction      
Allowance balance attributable to loans:      
Balance at the beginning of period 681 727 605
Provision charged to operations 294 (46) 122
Balance at the end of period 975 681 727
Commercial, financial and agricultural      
Allowance balance attributable to loans:      
Balance at the beginning of period 7,121 6,688 7,478
Provision charged to operations 3,589 458 (440)
Loans charged off (18) (29) (409)
Recoveries of loans previously charged off 4 4 59
Balance at the end of period 10,696 7,121 6,688
Equity lines      
Allowance balance attributable to loans:      
Balance at the beginning of period 733 1,106 688
Provision charged to operations (47) (235) 418
Loans charged off   (138)  
Recoveries of loans previously charged off 1    
Balance at the end of period 687 733 1,106
Consumer      
Allowance balance attributable to loans:      
Balance at the beginning of period 465 257 231
Provision charged to operations (34) 329 140
Loans charged off (231) (349) (344)
Recoveries of loans previously charged off 171 228 230
Balance at the end of period 371 465 257
Consumer finance      
Allowance balance attributable to loans:      
Balance at the beginning of period 21,793 22,999 24,353
Provision charged to operations 6,470 8,155 10,906
Loans charged off (9,331) (13,991) (16,477)
Recoveries of loans previously charged off 4,581 4,630 4,217
Balance at the end of period $ 23,513 $ 21,793 $ 22,999