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ALLOWANCE FOR CREDIT LOSSES AND RESERVE FOR OFF-BALANCE SHEET CREDIT EXPOSURE (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Changes in the allowance        
Beginning balance $ 77,781 $ 67,339 $ 83,269 $ 47,971
(Credit) provision for credit losses (2,635) 14,873 (6,899) 37,213
Subtotal 74,812 81,804 76,363 85,971
Charge-offs 1,163 2,388 4,794 8,823
Recoveries 938 1,126 3,018 3,394
Net charge-offs (recoveries) 225 1,262 1,776 5,429
Ending balance 74,587 80,542 74,587 80,542
(Credit) provision for credit losses on loans (2,969) 14,465 (6,906) 34,434
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]        
Off-balance sheet, credit loss, liability, beginning balance   4,383   1,272
Provision for off-balance sheet credit exposures 400 221 200 2,592
Off-balance sheet, credit loss, liability, ending balance 5,079 4,604 5,079 4,604
Provision (credit) on accrued interest receivable   200 (200) 200
Commercial Financial And Agricultural        
Changes in the allowance        
Beginning balance 356 388 304 0
Subtotal 185 390 185 390
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Net charge-offs (recoveries) 0 0 0 0
Ending balance 185 390 185 390
(Credit) provision for credit losses on loans (171) 2 (119) 390
Other        
Changes in the allowance        
Beginning balance 13,414 15,507 18,717 8,136
Subtotal 12,920 18,127 13,565 19,020
Charge-offs 334 810 1,344 2,350
Recoveries 281 321 646 968
Net charge-offs (recoveries) 53 489 698 1,382
Ending balance 12,867 17,638 12,867 17,638
(Credit) provision for credit losses on loans (494) 2,620 (5,152) 11,511
Construction | Real Estate        
Changes in the allowance        
Beginning balance 4,693 3,274 4,277 1,792
Subtotal 4,234 4,033 4,234 3,902
Charge-offs 0 0 0 0
Recoveries 0 0 0 131
Net charge-offs (recoveries) 0 0 0 (131)
Ending balance 4,234 4,033 4,234 4,033
(Credit) provision for credit losses on loans (459) 759 (43) 1,631
Residential Mortgage | Real Estate        
Changes in the allowance        
Beginning balance 16,911 15,025 16,484 13,327
Subtotal 14,502 18,562 14,210 18,413
Charge-offs 0 11 0 63
Recoveries 53 13 345 214
Net charge-offs (recoveries) (53) (2) (345) (151)
Ending balance 14,555 18,564 14,555 18,564
(Credit) provision for credit losses on loans (2,409) 3,537 (2,274) 4,478
Home Equity | Real Estate        
Changes in the allowance        
Beginning balance 6,309 3,651 5,449 4,206
Subtotal 5,715 6,168 5,706 6,137
Charge-offs 0 0 0 0
Recoveries 0 0 9 31
Net charge-offs (recoveries) 0 0 (9) (31)
Ending balance 5,715 6,168 5,715 6,168
(Credit) provision for credit losses on loans (594) 2,517 257 3,545
Commercial Mortgage | Real Estate        
Changes in the allowance        
Beginning balance 19,534 16,148 22,163 11,113
Subtotal 19,129 19,452 19,056 19,449
Charge-offs 0 75 0 75
Recoveries 0 12 73 15
Net charge-offs (recoveries) 0 63 (73) 60
Ending balance 19,129 19,389 19,129 19,389
(Credit) provision for credit losses on loans (405) 3,304 (3,107) 5,712
Consumer | Consumer        
Changes in the allowance        
Beginning balance 16,564 13,346 15,875 9,397
Subtotal 18,127 15,072 19,407 18,660
Charge-offs 829 1,492 3,450 6,335
Recoveries 604 780 1,945 2,035
Net charge-offs (recoveries) 225 712 1,505 4,300
Ending balance 17,902 14,360 17,902 14,360
(Credit) provision for credit losses on loans 1,563 $ 1,726 3,532 7,167
Impact of the adoption of new accounting standards        
Changes in the allowance        
Beginning balance       3,566
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]        
Off-balance sheet, credit loss, liability, beginning balance       740
Impact of the adoption of new accounting standards | Commercial Financial And Agricultural        
Changes in the allowance        
Beginning balance       0
Impact of the adoption of new accounting standards | Other        
Changes in the allowance        
Beginning balance       (627)
Impact of the adoption of new accounting standards | Construction | Real Estate        
Changes in the allowance        
Beginning balance       479
Impact of the adoption of new accounting standards | Residential Mortgage | Real Estate        
Changes in the allowance        
Beginning balance       608
Impact of the adoption of new accounting standards | Home Equity | Real Estate        
Changes in the allowance        
Beginning balance       (1,614)
Impact of the adoption of new accounting standards | Commercial Mortgage | Real Estate        
Changes in the allowance        
Beginning balance       2,624
Impact of the adoption of new accounting standards | Consumer | Consumer        
Changes in the allowance        
Beginning balance       2,096
Adjusted balance at beginning of period        
Changes in the allowance        
Beginning balance       51,537
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]        
Off-balance sheet, credit loss, liability, beginning balance 4,744   4,884 2,012
Provision for off-balance sheet credit exposures $ 335   $ 195  
Adjusted balance at beginning of period | Commercial Financial And Agricultural        
Changes in the allowance        
Beginning balance       0
Adjusted balance at beginning of period | Other        
Changes in the allowance        
Beginning balance       7,509
Adjusted balance at beginning of period | Construction | Real Estate        
Changes in the allowance        
Beginning balance       2,271
Adjusted balance at beginning of period | Residential Mortgage | Real Estate        
Changes in the allowance        
Beginning balance       13,935
Adjusted balance at beginning of period | Home Equity | Real Estate        
Changes in the allowance        
Beginning balance       2,592
Adjusted balance at beginning of period | Commercial Mortgage | Real Estate        
Changes in the allowance        
Beginning balance       13,737
Adjusted balance at beginning of period | Consumer | Consumer        
Changes in the allowance        
Beginning balance       $ 11,493