v3.26.1
LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (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 loss - loans          
Beginning balance     $ 87,921    
Ending balance $ 91,696 $ 81,900 91,696 $ 81,900 $ 87,921
Accrued interest receivable on loans 38,300   38,300    
Amounts outstanding 598,000   598,000   450,000
Net loans 11,191,128   11,191,128   10,861,836
Loans purchased     300    
Foreclosures in progress 12,600   12,600   9,400
Sale of secondary market eligible residential consumer mortgage loans     34,400 34,100  
Liabilities for off-balance-sheet          
Beginning balance 1,453 867 1,075 1,132 1,132
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
PCD Allowance at Acquisition     0    
Provision (193) (8) 185 (273)  
Ending balance 1,260 859 1,260 859 1,075
Asset Pledged as Collateral | Borrowings from FHLB and FRB          
Allowance for credit loss - loans          
Net loans 7,060,000   7,060,000   6,830,000
Business lending          
Allowance for credit loss - loans          
Charge-offs     (1,456)   (7,134)
Consumer mortgage          
Allowance for credit loss - loans          
Charge-offs     (94)   (56)
Consumer indirect          
Allowance for credit loss - loans          
Charge-offs     (6,647)   (13,570)
Consumer direct          
Allowance for credit loss - loans          
Charge-offs     (4,131)   (2,501)
Home equity          
Allowance for credit loss - loans          
Charge-offs     (41)   (153)
Commercial Portfolio Segment | Business lending          
Allowance for credit loss - loans          
Beginning balance 49,952 42,988 46,155 37,201 37,201
Charge-offs (1,101) (4,897) (1,456) (5,620)  
Recoveries 213 350 379 449  
Allowance at Acquisition     4    
Provision 1,891 2,713 5,873 9,124  
Ending balance 50,955 41,154 50,955 41,154 46,155
Residential Portfolio Segment | Consumer mortgage          
Allowance for credit loss - loans          
Beginning balance 12,583 13,679 14,005 15,017 15,017
Charge-offs (45) (18) (94) (23)  
Recoveries 0 5 2 11  
Allowance at Acquisition     3    
Provision 80 530 (1,298) (809)  
Ending balance 12,618 14,196 12,618 14,196 14,005
Residential Portfolio Segment | Home equity          
Allowance for credit loss - loans          
Beginning balance 1,512 1,394 1,590 1,548 1,548
Charge-offs (32) (16) (41) (23)  
Recoveries 0 1 0 1  
Allowance at Acquisition     (21)    
Provision 120 104 72 (43)  
Ending balance 1,600 1,483 1,600 1,483 1,590
Consumer Portfolio Segment | Consumer indirect          
Allowance for credit loss - loans          
Beginning balance 20,690 19,746 20,914 20,895 20,895
Charge-offs (3,190) (2,620) (6,647) (6,585)  
Recoveries 2,076 2,414 4,307 4,108  
Allowance at Acquisition     0    
Provision 1,008 345 2,010 1,467  
Ending balance 20,584 19,885 20,584 19,885 20,914
Consumer Portfolio Segment | Consumer direct          
Allowance for credit loss - loans          
Beginning balance 4,456 4,033 4,257 3,453 3,453
Charge-offs (1,896) (657) (4,131) (1,217)  
Recoveries 678 324 1,412 556  
Allowance at Acquisition     0    
Provision 1,701 433 3,401 1,341  
Ending balance 4,939 4,133 4,939 4,133 4,257
Unallocated          
Allowance for credit loss - loans          
Beginning balance 1,000 1,000 1,000 1,000 1,000
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Allowance at Acquisition     0    
Provision 0 0 0 0  
Ending balance 1,000 1,000 1,000 1,000 1,000
Allowances for credit losses          
Allowance for credit loss - loans          
Beginning balance 90,193 82,840 87,921 79,114 79,114
Charge-offs (6,264) (8,208) (12,369) (13,468)  
Recoveries 2,967 3,094 6,100 5,125  
Allowance at Acquisition     (14)    
Provision 4,800 4,125 10,058 11,080  
Ending balance 91,696 81,851 91,696 81,851 87,921
Total allowances for credit losses          
Allowance for credit loss          
Beginning balance 91,646 83,707 88,996 80,246 80,246
Charge-offs (6,264) (8,208) (12,369) (13,468)  
Recoveries 2,967 3,094 6,100 5,125  
PCD Allowance at Acquisition     (14)    
Provision 4,607 4,117 10,243 10,807  
Ending balance $ 92,956 $ 82,710 $ 92,956 $ 82,710 $ 88,996