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ALLOWANCE FOR CREDIT LOSSES AND RESERVE FOR OFF-BALANCE SHEET CREDIT EXPOSURE (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Changes in the allowance    
Beginning balance $ 68,097 $ 83,269
(Credit) provision for credit losses (3,195) (821)
Subtotal 65,166 82,295
Charge-offs 1,470 1,707
Recoveries 1,058 965
Net charge-offs (recoveries) 412 742
Ending balance 64,754 81,553
(Credit) provision for credit losses on loans (2,931) (974)
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]    
Off-balance sheet, credit loss, liability, beginning balance   4,884
(Credit) provision for off-balance sheet credit exposures (300) 153
Off-balance sheet, credit loss, liability, ending balance 4,540 5,037
Commercial, financial and agricultural:    
Changes in the allowance    
Beginning balance 77 304
Subtotal 36 489
Charge-offs 0 0
Recoveries 0 0
Net charge-offs (recoveries) 0 0
Ending balance 36 489
(Credit) provision for credit losses on loans (41) 185
Other    
Changes in the allowance    
Beginning balance 10,314 18,717
Subtotal 9,466 15,984
Charge-offs 254 609
Recoveries 350 89
Net charge-offs (recoveries) (96) 520
Ending balance 9,562 15,464
(Credit) provision for credit losses on loans (848) (2,733)
Construction | Real Estate    
Changes in the allowance    
Beginning balance 3,908 4,277
Subtotal 3,836 5,047
Charge-offs 0 0
Recoveries 0 0
Net charge-offs (recoveries) 0 0
Ending balance 3,836 5,047
(Credit) provision for credit losses on loans (72) 770
Residential Mortgage | Real Estate    
Changes in the allowance    
Beginning balance 12,463 16,484
Subtotal 10,931 15,251
Charge-offs 0 0
Recoveries 112 106
Net charge-offs (recoveries) (112) (106)
Ending balance 11,043 15,357
(Credit) provision for credit losses on loans (1,532) (1,233)
Home Equity | Real Estate    
Changes in the allowance    
Beginning balance 4,509 5,449
Subtotal 4,641 5,242
Charge-offs 0 0
Recoveries 0 9
Net charge-offs (recoveries) 0 (9)
Ending balance 4,641 5,251
(Credit) provision for credit losses on loans 132 (207)
Commercial Mortgage | Real Estate    
Changes in the allowance    
Beginning balance 18,411 22,163
Subtotal 16,055 22,726
Charge-offs 0 0
Recoveries 0 8
Net charge-offs (recoveries) 0 (8)
Ending balance 16,055 22,734
(Credit) provision for credit losses on loans (2,356) 563
Consumer | Consumer    
Changes in the allowance    
Beginning balance 18,415 15,875
Subtotal 20,201 17,556
Charge-offs 1,216 1,098
Recoveries 596 753
Net charge-offs (recoveries) 620 345
Ending balance 19,581 17,211
(Credit) provision for credit losses on loans 1,786 $ 1,681
Adjusted balance at beginning of period    
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]    
Off-balance sheet, credit loss, liability, beginning balance 4,804  
(Credit) provision for off-balance sheet credit exposures $ (264)