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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, 2021
Mar. 31, 2020
Changes in the allowance    
Beginning balance   $ 47,971
Provision for credit losses $ (821) 11,127
Subtotal 82,295 60,866
Charge-offs 1,707 2,654
Recoveries 965 1,433
Net charge-offs (recoveries) 742 1,221
Ending balance 81,553 59,645
Provision for credit losses on loans (974) 9,329
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]    
Off-balance sheet, credit loss, liability, beginning balance   1,272
Provision for off-balance sheet credit exposures 153 1,798
Off-balance sheet, credit loss, liability, ending balance 5,037 3,810
Commercial Financial And Agricultural    
Changes in the allowance    
Beginning balance   0
Subtotal 489 0
Charge-offs 0 0
Recoveries 0 0
Net charge-offs (recoveries) 0 0
Ending balance 489 0
Provision for credit losses on loans 185 0
Other    
Changes in the allowance    
Beginning balance   8,136
Subtotal 15,984 8,740
Charge-offs 609 437
Recoveries 89 342
Net charge-offs (recoveries) 520 95
Ending balance 15,464 8,645
Provision for credit losses on loans (2,733) 1,231
Construction | Real Estate    
Changes in the allowance    
Beginning balance   1,792
Subtotal 5,047 2,926
Charge-offs 0 0
Recoveries 0 131
Net charge-offs (recoveries) 0 (131)
Ending balance 5,047 3,057
Provision for credit losses on loans 770 655
Residential Mortgage | Real Estate    
Changes in the allowance    
Beginning balance   13,327
Subtotal 15,251 13,000
Charge-offs 0 0
Recoveries 106 181
Net charge-offs (recoveries) (106) (181)
Ending balance 15,357 13,181
Provision for credit losses on loans (1,233) (935)
Home Equity | Real Estate    
Changes in the allowance    
Beginning balance   4,206
Subtotal 5,242 2,278
Charge-offs 0 0
Recoveries 9 31
Net charge-offs (recoveries) (9) (31)
Ending balance 5,251 2,309
Provision for credit losses on loans (207) (314)
Commercial Mortgage | Real Estate    
Changes in the allowance    
Beginning balance   11,113
Subtotal 22,726 19,516
Charge-offs 0 0
Recoveries 8 2
Net charge-offs (recoveries) (8) (2)
Ending balance 22,734 19,518
Provision for credit losses on loans 563 5,779
Consumer | U.S. Mainland Consumer - Unsecured    
Changes in the allowance    
Beginning balance   9,397
Subtotal 17,556 14,406
Charge-offs 1,098 2,217
Recoveries 753 746
Net charge-offs (recoveries) 345 1,471
Ending balance 17,211 12,935
Provision for credit losses on loans 1,681 2,913
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 | U.S. Mainland Consumer - Unsecured    
Changes in the allowance    
Beginning balance   2,096
Adjusted balance at beginning of period    
Changes in the allowance    
Beginning balance 83,269 51,537
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]    
Off-balance sheet, credit loss, liability, beginning balance 4,884 2,012
Adjusted balance at beginning of period | Commercial Financial And Agricultural    
Changes in the allowance    
Beginning balance 304 0
Adjusted balance at beginning of period | Other    
Changes in the allowance    
Beginning balance 18,717 7,509
Adjusted balance at beginning of period | Construction | Real Estate    
Changes in the allowance    
Beginning balance 4,277 2,271
Adjusted balance at beginning of period | Residential Mortgage | Real Estate    
Changes in the allowance    
Beginning balance 16,484 13,935
Adjusted balance at beginning of period | Home Equity | Real Estate    
Changes in the allowance    
Beginning balance 5,449 2,592
Adjusted balance at beginning of period | Commercial Mortgage | Real Estate    
Changes in the allowance    
Beginning balance 22,163 13,737
Adjusted balance at beginning of period | Consumer | U.S. Mainland Consumer - Unsecured    
Changes in the allowance    
Beginning balance $ 15,875 $ 11,493