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ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY INFORMATION - Schedule of Allowance for Loan Losses and Loan Balances (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Allowance for credit losses          
Beginning balance $ 198,253 $ 171,869 $ 186,126 $ 151,861 $ 151,861
Charge-offs (23,101) (16,847) (52,532) (46,387)  
Recoveries 3,916 2,552 10,521 7,257  
Provision (release) 18,422 18,414 53,375 63,257  
Ending balance 197,490 175,988 197,490 175,988 186,126
Period-end allowance allocated to:          
Loans evaluated on an individual basis 8,529 2,815 8,529 2,815  
Loans evaluated on a collective basis 188,961 173,173 188,961 173,173  
Period-end loan balances:          
Loans evaluated on an individual basis 93,617 63,179 93,617 63,179  
Loans evaluated on a collective basis 13,225,371 12,612,442 13,225,371 12,612,442  
Ending balance 13,318,988 12,675,621 13,318,988 12,675,621 12,766,518
Reverse mortgage, fair value 3,200 2,800 3,200 2,800 2,800
Commercial | Commercial and industrial          
Allowance for credit losses          
Beginning balance 56,516 52,400 49,394 49,526 49,526
Charge-offs (11,277) (7,153) (13,659) (20,169) (26,653)
Recoveries 2,481 1,640 5,983 4,155  
Provision (release) 9,075 4,791 15,077 18,166  
Ending balance 56,795 51,678 56,795 51,678 49,394
Period-end allowance allocated to:          
Loans evaluated on an individual basis 8,529 1,054 8,529 1,054  
Loans evaluated on a collective basis 48,266 50,624 48,266 50,624  
Period-end loan balances:          
Loans evaluated on an individual basis 64,972 26,355 64,972 26,355  
Loans evaluated on a collective basis 2,574,294 2,617,684 2,574,294 2,617,684  
Ending balance 2,639,266 2,644,039 2,639,266 2,644,039 2,540,070
Commercial | Owner-occupied commercial          
Allowance for credit losses          
Beginning balance 9,668 6,335 10,719 6,019 6,019
Charge-offs (177) 0 (177) (184) (184)
Recoveries 4 14 209 50  
Provision (release) 292 1,501 (964) 1,965  
Ending balance 9,787 7,850 9,787 7,850 10,719
Period-end allowance allocated to:          
Loans evaluated on an individual basis 0 161 0 161  
Loans evaluated on a collective basis 9,787 7,689 9,787 7,689  
Period-end loan balances:          
Loans evaluated on an individual basis 6,465 16,442 6,465 16,442  
Loans evaluated on a collective basis 1,997,257 1,907,729 1,997,257 1,907,729  
Ending balance 2,003,722 1,924,171 2,003,722 1,924,171 1,886,087
Commercial | Commercial mortgages          
Allowance for credit losses          
Beginning balance 46,831 31,937 36,055 21,473 21,473
Charge-offs (205) (300) (5,137) (300) (300)
Recoveries 79 1 183 4  
Provision (release) 2,284 1,549 17,888 12,010  
Ending balance 48,989 33,187 48,989 33,187 36,055
Period-end allowance allocated to:          
Loans evaluated on an individual basis 0 0 0 0  
Loans evaluated on a collective basis 48,989 33,187 48,989 33,187  
Period-end loan balances:          
Loans evaluated on an individual basis 7,449 7,918 7,449 7,918  
Loans evaluated on a collective basis 4,141,600 3,637,805 4,141,600 3,637,805  
Ending balance 4,149,049 3,645,723 4,149,049 3,645,723 3,801,180
Commercial | Construction          
Allowance for credit losses          
Beginning balance 9,198 9,228 10,762 6,987 6,987
Charge-offs 0 0 0 0 (794)
Recoveries 0 1 0 532  
Provision (release) (850) 2,088 (2,414) 3,798  
Ending balance 8,348 11,317 8,348 11,317 10,762
Period-end allowance allocated to:          
Loans evaluated on an individual basis 0 1,600 0 1,600  
Loans evaluated on a collective basis 8,348 9,717 8,348 9,717  
Period-end loan balances:          
Loans evaluated on an individual basis 3,308 4,828 3,308 4,828  
Loans evaluated on a collective basis 802,549 1,038,740 802,549 1,038,740  
Ending balance 805,857 1,043,568 805,857 1,043,568 1,035,530
Commercial | Commercial Small Business Leases          
Allowance for credit losses          
Beginning balance 16,218 10,383 15,170 9,868 9,868
Charge-offs (5,451) (3,522) (15,191) (10,327) (15,641)
Recoveries 664 484 2,086 1,399  
Provision (release) 3,943 2,647 13,309 9,052  
Ending balance 15,374 9,992 15,374 9,992 15,170
Period-end allowance allocated to:          
Loans evaluated on an individual basis 0 0 0 0  
Loans evaluated on a collective basis 15,374 9,992 15,374 9,992  
Period-end loan balances:          
Loans evaluated on an individual basis 0 0 0 0  
Loans evaluated on a collective basis 645,421 605,698 645,421 605,698  
Ending balance 645,421 605,698 645,421 605,698 623,622
Residential          
Allowance for credit losses          
Beginning balance 5,057 5,043 5,483 4,668 4,668
Charge-offs (8) 0 (109) (33) (41)
Recoveries 44 55 176 211  
Provision (release) 370 253 (87) 505  
Ending balance 5,463 5,351 5,463 5,351 5,483
Period-end allowance allocated to:          
Loans evaluated on an individual basis 0 0 0 0  
Loans evaluated on a collective basis 5,463 5,351 5,463 5,351  
Period-end loan balances:          
Loans evaluated on an individual basis 8,442 5,838 8,442 5,838  
Loans evaluated on a collective basis 929,152 849,502 929,152 849,502  
Ending balance 937,594 855,340 937,594 855,340 867,895
Consumer          
Allowance for credit losses          
Beginning balance 54,765 56,543 58,543 53,320 53,320
Charge-offs (5,983) (5,872) (18,259) (15,374) (22,394)
Recoveries 644 357 1,884 906  
Provision (release) 3,308 5,585 10,566 17,761  
Ending balance 52,734 56,613 52,734 56,613 58,543
Period-end allowance allocated to:          
Loans evaluated on an individual basis 0 0 0 0  
Loans evaluated on a collective basis 52,734 56,613 52,734 56,613  
Period-end loan balances:          
Loans evaluated on an individual basis 2,981 1,798 2,981 1,798  
Loans evaluated on a collective basis 2,135,098 1,955,284 2,135,098 1,955,284  
Ending balance $ 2,138,079 $ 1,957,082 $ 2,138,079 $ 1,957,082 $ 2,012,134