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ALLOWANCE FOR CREDIT LOSSES AND RESERVE FOR OFF-BALANCE SHEET CREDIT EXPOSURES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Changes in the allowance      
Beginning balance $ 63,738 $ 68,097 $ 83,269
Provision (credit) for credit losses on loans 15,235 288 (14,323)
Subtotal 78,973 68,385 68,946
Charge-offs 19,207 8,368 6,125
Recoveries 4,168 3,721 5,276
Net charge-offs (recoveries) 15,039 4,647 849
Ending balance 63,934 63,738 68,097
Reserve against accrued receivable 200 200 200
Commercial and industrial: | Small Business Administration Paycheck Protection Program ("SBA PPP")      
Changes in the allowance      
Beginning balance 2 77 304
Provision (credit) for credit losses on loans (2) (75) (227)
Subtotal 0 2 77
Charge-offs 0 0 0
Recoveries 0 0 0
Net charge-offs (recoveries) 0 0 0
Ending balance 0 2 77
Commercial and industrial: | Other      
Changes in the allowance      
Beginning balance 6,822 10,314 18,717
Provision (credit) for credit losses on loans 1,601 (2,518) (7,684)
Subtotal 8,423 7,796 11,033
Charge-offs 1,962 1,969 1,723
Recoveries 720 995 1,004
Net charge-offs (recoveries) 1,242 974 719
Ending balance 7,181 6,822 10,314
Real Estate | Construction      
Changes in the allowance      
Beginning balance 2,867 3,908 4,277
Provision (credit) for credit losses on loans 1,136 (1,117) (1,528)
Subtotal 4,003 2,791 2,749
Charge-offs 0 0 0
Recoveries 1 76 1,159
Net charge-offs (recoveries) (1) (76) (1,159)
Ending balance 4,004 2,867 3,908
Real Estate | Residential mortgage      
Changes in the allowance      
Beginning balance 11,804 12,463 16,484
Provision (credit) for credit losses on loans 2,745 (954) (4,379)
Subtotal 14,549 11,509 12,105
Charge-offs 0 0 0
Recoveries 77 295 358
Net charge-offs (recoveries) (77) (295) (358)
Ending balance 14,626 11,804 12,463
Real Estate | Home equity      
Changes in the allowance      
Beginning balance 4,114 4,509 5,449
Provision (credit) for credit losses on loans (670) (431) (949)
Subtotal 3,444 4,078 4,500
Charge-offs 0 0 0
Recoveries 57 36 9
Net charge-offs (recoveries) (57) (36) (9)
Ending balance 3,501 4,114 4,509
Real Estate | Commercial mortgage      
Changes in the allowance      
Beginning balance 17,902 18,411 22,163
Provision (credit) for credit losses on loans (359) (509) (3,825)
Subtotal 17,543 17,902 18,338
Charge-offs 0 0 0
Recoveries 0 0 73
Net charge-offs (recoveries) 0 0 (73)
Ending balance 17,543 17,902 18,411
Consumer | Consumer      
Changes in the allowance      
Beginning balance 20,227 18,415 15,875
Provision (credit) for credit losses on loans 10,784 5,892 4,269
Subtotal 31,011 24,307 20,144
Charge-offs 17,245 6,399 4,402
Recoveries 3,313 2,319 2,673
Net charge-offs (recoveries) 13,932 4,080 1,729
Ending balance $ 17,079 $ 20,227 $ 18,415