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Allowance for Credit Losses - Activity in ACL by Class of Loans and Leases (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Rollforward of the Allowance for Credit Losses      
Balance at beginning of year $ 156,533 $ 143,900 $ 157,262
Charge-offs (22,017) (23,506) (20,888)
Recoveries 8,369 11,279 9,647
Provision 17,508 24,860 (2,121)
Balance at end of year 160,393 156,533 143,900
Real Estate Loan [Member]      
Rollforward of the Allowance for Credit Losses      
Charge-offs   (122)  
Home Equity Line      
Rollforward of the Allowance for Credit Losses      
Charge-offs   (292)  
Commercial Lending      
Rollforward of the Allowance for Credit Losses      
Charge-offs (4,015) (5,982)  
Commercial and Industrial      
Rollforward of the Allowance for Credit Losses      
Balance at beginning of year 14,956 14,564 20,080
Charge-offs (3,615) (3,482) (2,012)
Recoveries 919 3,346 897
Provision 4,072 528 (4,401)
Balance at end of year 16,332 14,956 14,564
Commercial Real Estate      
Rollforward of the Allowance for Credit Losses      
Balance at beginning of year 43,944 43,810 42,951
Charge-offs (400) (2,500) (750)
Recoveries     14
Provision (2,920) 2,634 1,595
Balance at end of year 40,624 43,944 43,810
Construction      
Rollforward of the Allowance for Credit Losses      
Balance at beginning of year 10,392 5,843 9,773
Charge-offs 0    
Provision (1,822) 4,549 (3,930)
Balance at end of year 8,570 10,392 5,843
Lease financing      
Rollforward of the Allowance for Credit Losses      
Balance at beginning of year 1,754 1,551 1,659
Charge-offs 0    
Recoveries     60
Provision 515 203 (168)
Balance at end of year 2,269 1,754 1,551
Residential mortgage      
Rollforward of the Allowance for Credit Losses      
Balance at beginning of year 36,880 35,175 34,364
Charge-offs   (414) (103)
Recoveries 119 141 418
Provision 2,231 1,686 496
Balance at end of year 39,230 36,880 35,175
Residential mortgage | Real Estate Loan [Member]      
Rollforward of the Allowance for Credit Losses      
Charge-offs   (122)  
Residential mortgage | Home Equity Line      
Rollforward of the Allowance for Credit Losses      
Charge-offs 0    
Home Equity Line      
Rollforward of the Allowance for Credit Losses      
Balance at beginning of year 11,728 8,296 5,642
Charge-offs   (292) (1,175)
Recoveries 274 702 713
Provision (1,797) 3,022 3,116
Balance at end of year 10,205 11,728 8,296
Consumer      
Rollforward of the Allowance for Credit Losses      
Balance at beginning of year 36,879 34,661 42,793
Charge-offs (18,002) (17,110) (16,848)
Recoveries 7,057 7,090 7,545
Provision 17,229 12,238 1,171
Balance at end of year $ 43,163 $ 36,879 $ 34,661