v3.26.1
ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY INFORMATION - Schedule of Allowance for Loan Losses and Loan Balances (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Allowance for credit losses          
Beginning balance $ 180,011 $ 187,515 $ 179,647 $ 195,281 $ 195,281
Charge-offs 9,284 8,566 23,651 35,667  
Recoveries 2,172 7,454 19,996 10,005  
Charge-offs arising from transfer of loans to held for sale   (8,655)   (8,655)  
Provision 4,364 8,556 1,271 25,340  
Ending balance 177,263 186,304 177,263 186,304 179,647
Period-end allowance allocated to:          
Loans evaluated on an individual basis 2,035 6,294 2,035 6,294  
Loans evaluated on a collective basis 175,228 180,010 175,228 180,010  
Period-end loan balances:          
Loans evaluated on an individual basis 70,479 97,603 70,479 97,603  
Loans evaluated on a collective basis 13,392,638 12,891,943 13,392,638 12,891,943  
Ending balance 13,463,117 12,989,546 13,463,117 12,989,546 13,257,946
Reverse mortgage, fair value 4,000 4,700 4,000 4,700 3,700
Commercial | Commercial and Industrial          
Allowance for credit losses          
Beginning balance 51,312 50,736 52,927 57,131 57,131
Charge-offs 3,658 1,280 9,406 21,151 32,120
Recoveries 334 1,865 16,637 2,444  
Charge-offs arising from transfer of loans to held for sale   (552)   (552)  
Provision 3,895 1,352 (8,275) 14,249  
Ending balance 51,883 52,121 51,883 52,121 52,927
Period-end allowance allocated to:          
Loans evaluated on an individual basis 0 0 0 0  
Loans evaluated on a collective basis 51,883 52,121 51,883 52,121  
Period-end loan balances:          
Loans evaluated on an individual basis 19,847 27,551 19,847 27,551  
Loans evaluated on a collective basis 2,993,868 2,716,841 2,993,868 2,716,841  
Ending balance 3,013,715 2,744,392 3,013,715 2,744,392 2,796,654
Commercial | Owner-occupied commercial          
Allowance for credit losses          
Beginning balance 8,168 8,410 7,626 9,139 9,139
Charge-offs 0 0 298 0 215
Recoveries 1 5 12 12  
Charge-offs arising from transfer of loans to held for sale   0   0  
Provision 548 169 1,377 (567)  
Ending balance 8,717 8,584 8,717 8,584 7,626
Period-end allowance allocated to:          
Loans evaluated on an individual basis 0 0 0 0  
Loans evaluated on a collective basis 8,717 8,584 8,717 8,584  
Period-end loan balances:          
Loans evaluated on an individual basis 20,513 6,311 20,513 6,311  
Loans evaluated on a collective basis 1,909,854 1,941,283 1,909,854 1,941,283  
Ending balance 1,930,367 1,947,594 1,930,367 1,947,594 1,937,339
Commercial | Commercial mortgages          
Allowance for credit losses          
Beginning balance 48,816 49,792 48,047 48,962 48,962
Charge-offs 1,740 197 1,740 197 4,583
Recoveries 532 2 534 527  
Charge-offs arising from transfer of loans to held for sale   0   0  
Provision 1,843 5,178 2,610 5,483  
Ending balance 49,451 54,775 49,451 54,775 48,047
Period-end allowance allocated to:          
Loans evaluated on an individual basis 0 5,125 0 5,125  
Loans evaluated on a collective basis 49,451 49,650 49,451 49,650  
Period-end loan balances:          
Loans evaluated on an individual basis 11,522 24,115 11,522 24,115  
Loans evaluated on a collective basis 3,872,327 3,887,422 3,872,327 3,887,422  
Ending balance 3,883,849 3,911,537 3,883,849 3,911,537 3,916,159
Commercial | Construction          
Allowance for credit losses          
Beginning balance 13,870 9,691 13,264 9,185 9,185
Charge-offs 0 0 3,735 0 4,900
Recoveries 0 0 0 0  
Charge-offs arising from transfer of loans to held for sale   0   0  
Provision (329) 1,005 4,012 1,511  
Ending balance 13,541 10,696 13,541 10,696 13,264
Period-end allowance allocated to:          
Loans evaluated on an individual basis 2,035 1,169 2,035 1,169  
Loans evaluated on a collective basis 11,506 9,527 11,506 9,527  
Period-end loan balances:          
Loans evaluated on an individual basis 7,939 28,505 7,939 28,505  
Loans evaluated on a collective basis 995,060 829,126 995,060 829,126  
Ending balance 1,002,999 857,631 1,002,999 857,631 1,023,911
Commercial | Commercial Small Business Leases          
Allowance for credit losses          
Beginning balance 15,840 17,109 16,449 15,965 15,965
Charge-offs 2,417 4,376 5,337 7,343 14,386
Recoveries 724 714 1,570 1,333  
Charge-offs arising from transfer of loans to held for sale   0   0  
Provision 3,277 4,854 4,742 8,346  
Ending balance 17,424 18,301 17,424 18,301 16,449
Period-end allowance allocated to:          
Loans evaluated on an individual basis 0 0 0 0  
Loans evaluated on a collective basis 17,424 18,301 17,424 18,301  
Period-end loan balances:          
Loans evaluated on an individual basis 0 0 0 0  
Loans evaluated on a collective basis 584,175 630,127 584,175 630,127  
Ending balance 584,175 630,127 584,175 630,127 603,321
Residential          
Allowance for credit losses          
Beginning balance 7,330 5,697 6,764 5,566 5,566
Charge-offs 0 0 0 0 0
Recoveries 49 50 94 97  
Charge-offs arising from transfer of loans to held for sale   0   0  
Provision (1,119) 68 (598) 152  
Ending balance 6,260 5,815 6,260 5,815 6,764
Period-end allowance allocated to:          
Loans evaluated on an individual basis 0 0 0 0  
Loans evaluated on a collective basis 6,260 5,815 6,260 5,815  
Period-end loan balances:          
Loans evaluated on an individual basis 7,056 7,665 7,056 7,665  
Loans evaluated on a collective basis 1,225,718 968,797 1,225,718 968,797  
Ending balance 1,232,774 976,462 1,232,774 976,462 1,086,102
Consumer(3)          
Allowance for credit losses          
Beginning balance 34,675 46,080 34,570 49,333 49,333
Charge-offs 1,469 2,713 3,135 6,976 18,863
Recoveries 532 4,818 1,149 5,592  
Charge-offs arising from transfer of loans to held for sale   (8,103)   (8,103)  
Provision (3,751) (4,070) (2,597) (3,834)  
Ending balance 29,987 36,012 29,987 36,012 34,570
Period-end allowance allocated to:          
Loans evaluated on an individual basis 0 0 0 0  
Loans evaluated on a collective basis 29,987 36,012 29,987 36,012  
Period-end loan balances:          
Loans evaluated on an individual basis 3,602 3,456 3,602 3,456  
Loans evaluated on a collective basis 1,811,636 1,918,347 1,811,636 1,918,347  
Ending balance $ 1,815,238 $ 1,921,803 $ 1,815,238 $ 1,921,803 $ 1,894,460