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Allowance for Loan Losses - Change in Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance balance attributable to loans:      
Balance at the beginning of period $ 34,023 $ 35,726 $ 37,066
Provision charged to operations 8,515 11,006 16,435
Loans charged off (14,553) (17,272) (22,396)
Recoveries of loans previously charged off 4,888 4,563 4,621
Balance at the end of period 32,873 34,023 35,726
Real estate - residential mortgage      
Allowance balance attributable to loans:      
Balance at the beginning of period 2,246 2,371 2,559
Provision charged to operations (146) (140) (127)
Loans charged off (46) (42) (179)
Recoveries of loans previously charged off 26 57 118
Balance at the end of period 2,080 2,246 2,371
Real estate - construction      
Allowance balance attributable to loans:      
Balance at the beginning of period 727 605 816
Provision charged to operations (46) 122 (211)
Balance at the end of period 681 727 605
Commercial, financial and agricultural      
Allowance balance attributable to loans:      
Balance at the beginning of period 6,688 7,478 7,393
Provision charged to operations 458 (440) 413
Loans charged off (29) (409) (349)
Recoveries of loans previously charged off 4 59 21
Balance at the end of period 7,121 6,688 7,478
Equity lines      
Allowance balance attributable to loans:      
Balance at the beginning of period 1,106 688 685
Provision charged to operations (235) 418 43
Loans charged off (138)   (42)
Recoveries of loans previously charged off     2
Balance at the end of period 733 1,106 688
Consumer      
Allowance balance attributable to loans:      
Balance at the beginning of period 257 231 261
Provision charged to operations 329 140 82
Loans charged off (349) (344) (301)
Recoveries of loans previously charged off 228 230 189
Balance at the end of period 465 257 231
Consumer finance      
Allowance balance attributable to loans:      
Balance at the beginning of period 22,999 24,353 25,352
Provision charged to operations 8,155 10,906 16,235
Loans charged off (13,991) (16,477) (21,525)
Recoveries of loans previously charged off 4,630 4,217 4,291
Balance at the end of period $ 21,793 $ 22,999 $ 24,353