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ALLOWANCE FOR LOAN AND LEASE LOSSES (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Changes in the allowance                      
Beginning balance       $ 83,269       $ 47,971 $ 83,269 $ 47,971 $ 47,916
(Credit) provision for credit losses $ (7,692) $ (2,635) $ (3,443) (821) $ 4,898 $ 14,873 $ 11,213 11,127 (14,591) 42,111 6,346
Provision (credit) for credit losses, excluding accrued interest receivable                 (14,323) 38,930 6,317
Subtotal                 68,946 90,467 54,233
Charge-offs                 6,125 11,355 10,748
Recoveries                 5,276 4,157 4,486
Net charge-offs (recoveries)                 849 7,198 6,262
Ending balance 68,097       83,269       68,097 83,269 47,971
Reserve against accrued receivable 200               200    
Impact of adoption of new accounting standards                      
Changes in the allowance                      
Beginning balance               3,566   3,566  
Ending balance                     3,566
Adjusted balance at beginning of period                      
Changes in the allowance                      
Beginning balance               51,537   51,537  
Ending balance                     51,537
Commercial, financial and agricultural: | Small Business Administration Paycheck Protection Program ("SBA PPP")                      
Changes in the allowance                      
Beginning balance       304       0 304 0 0
Provision (credit) for credit losses, excluding accrued interest receivable                 (227) 304 0
Subtotal                 77 304 0
Charge-offs                 0 0 0
Recoveries                 0 0 0
Net charge-offs (recoveries)                 0 0 0
Ending balance 77       304       77 304 0
Commercial, financial and agricultural: | Small Business Administration Paycheck Protection Program ("SBA PPP") | Impact of adoption of new accounting standards                      
Changes in the allowance                      
Beginning balance               0   0  
Ending balance                     0
Commercial, financial and agricultural: | Small Business Administration Paycheck Protection Program ("SBA PPP") | Adjusted balance at beginning of period                      
Changes in the allowance                      
Beginning balance               0   0  
Ending balance                     0
Commercial, financial and agricultural: | Other                      
Changes in the allowance                      
Beginning balance       18,717       8,136 18,717 8,136 8,027
Provision (credit) for credit losses, excluding accrued interest receivable                 (7,684) 13,077 1,413
Subtotal                 11,033 20,586 9,440
Charge-offs                 1,723 3,026 2,478
Recoveries                 1,004 1,157 1,174
Net charge-offs (recoveries)                 719 1,869 1,304
Ending balance 10,314       18,717       10,314 18,717 8,136
Commercial, financial and agricultural: | Other | Impact of adoption of new accounting standards                      
Changes in the allowance                      
Beginning balance               (627)   (627)  
Ending balance                     (627)
Commercial, financial and agricultural: | Other | Adjusted balance at beginning of period                      
Changes in the allowance                      
Beginning balance               7,509   7,509  
Ending balance                     7,509
Real estate | Construction                      
Changes in the allowance                      
Beginning balance       4,277       1,792 4,277 1,792 1,202
Provision (credit) for credit losses, excluding accrued interest receivable                 (1,528) 1,875 (20)
Subtotal                 2,749 4,146 1,182
Charge-offs                 0 0 0
Recoveries                 1,159 131 610
Net charge-offs (recoveries)                 (1,159) (131) (610)
Ending balance 3,908       4,277       3,908 4,277 1,792
Real estate | Construction | Impact of adoption of new accounting standards                      
Changes in the allowance                      
Beginning balance               479   479  
Ending balance                     479
Real estate | Construction | Adjusted balance at beginning of period                      
Changes in the allowance                      
Beginning balance               2,271   2,271  
Ending balance                     2,271
Real estate | Residential mortgage                      
Changes in the allowance                      
Beginning balance       16,484       13,327 16,484 13,327 14,349
Provision (credit) for credit losses, excluding accrued interest receivable                 (4,379) 2,383 (1,546)
Subtotal                 12,105 16,318 12,803
Charge-offs                 0 63 0
Recoveries                 358 229 524
Net charge-offs (recoveries)                 (358) (166) (524)
Ending balance 12,463       16,484       12,463 16,484 13,327
Real estate | Residential mortgage | Impact of adoption of new accounting standards                      
Changes in the allowance                      
Beginning balance               608   608  
Ending balance                     608
Real estate | Residential mortgage | Adjusted balance at beginning of period                      
Changes in the allowance                      
Beginning balance               13,935   13,935  
Ending balance                     13,935
Real estate | Home equity                      
Changes in the allowance                      
Beginning balance       5,449       4,206 5,449 4,206 3,788
Provision (credit) for credit losses, excluding accrued interest receivable                 (949) 2,824 381
Subtotal                 4,500 5,416 4,169
Charge-offs                 0 0 5
Recoveries                 9 33 42
Net charge-offs (recoveries)                 (9) (33) (37)
Ending balance 4,509       5,449       4,509 5,449 4,206
Real estate | Home equity | Impact of adoption of new accounting standards                      
Changes in the allowance                      
Beginning balance               (1,614)   (1,614)  
Ending balance                     (1,614)
Real estate | Home equity | Adjusted balance at beginning of period                      
Changes in the allowance                      
Beginning balance               2,592   2,592  
Ending balance                     2,592
Real estate | Commercial mortgage                      
Changes in the allowance                      
Beginning balance       22,163       11,113 22,163 11,113 13,358
Provision (credit) for credit losses, excluding accrued interest receivable                 (3,825) 8,485 (2,270)
Subtotal                 18,338 22,222 11,088
Charge-offs                 0 75 0
Recoveries                 73 16 25
Net charge-offs (recoveries)                 (73) 59 (25)
Ending balance 18,411       22,163       18,411 22,163 11,113
Real estate | Commercial mortgage | Impact of adoption of new accounting standards                      
Changes in the allowance                      
Beginning balance               2,624   2,624  
Ending balance                     2,624
Real estate | Commercial mortgage | Adjusted balance at beginning of period                      
Changes in the allowance                      
Beginning balance               13,737   13,737  
Ending balance                     13,737
Consumer | Consumer                      
Changes in the allowance                      
Beginning balance       $ 15,875       9,397 15,875 9,397 7,192
Provision (credit) for credit losses, excluding accrued interest receivable                 4,269 9,982 8,359
Subtotal                 20,144 21,475 15,551
Charge-offs                 4,402 8,191 8,265
Recoveries                 2,673 2,591 2,111
Net charge-offs (recoveries)                 1,729 5,600 6,154
Ending balance $ 18,415       $ 15,875       $ 18,415 15,875 9,397
Consumer | Consumer | Impact of adoption of new accounting standards                      
Changes in the allowance                      
Beginning balance               2,096   2,096  
Ending balance                     2,096
Consumer | Consumer | Adjusted balance at beginning of period                      
Changes in the allowance                      
Beginning balance               $ 11,493   $ 11,493  
Ending balance                     $ 11,493