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Allowance for Loan Losses - Change in Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Allowance balance attributable to loans:    
Balance at the beginning of period $ 39,156 $ 32,873
Provision charged to operations 280 2,650
Loans charged off (1,696) (3,541)
Recoveries of loans previously charged off 1,293 1,316
Balance at the end of period 39,033 33,298
Real estate - residential mortgage    
Allowance balance attributable to loans:    
Balance at the beginning of period 2,914 2,080
Provision charged to operations (28) 60
Loans charged off   (4)
Recoveries of loans previously charged off 7 4
Balance at the end of period 2,893 2,140
Real estate - construction    
Allowance balance attributable to loans:    
Balance at the beginning of period 975 681
Provision charged to operations (153) 90
Balance at the end of period 822 771
Commercial, financial and agricultural    
Allowance balance attributable to loans:    
Balance at the beginning of period 10,696 7,121
Provision charged to operations 311 831
Loans charged off   (18)
Recoveries of loans previously charged off   1
Balance at the end of period 11,007 7,935
Equity lines    
Allowance balance attributable to loans:    
Balance at the beginning of period 687 733
Provision charged to operations (16) 37
Balance at the end of period 671 770
Consumer    
Allowance balance attributable to loans:    
Balance at the beginning of period 371 465
Provision charged to operations (84) (18)
Loans charged off (45) (93)
Recoveries of loans previously charged off 35 62
Balance at the end of period 277 416
Consumer finance    
Allowance balance attributable to loans:    
Balance at the beginning of period 23,513 21,793
Provision charged to operations 250 1,650
Loans charged off (1,651) (3,426)
Recoveries of loans previously charged off 1,251 1,249
Balance at the end of period $ 23,363 $ 21,266