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Allowance for Credit Losses and Credit Quality of Loans, Allowance for Credit Losses by Portfolio Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Activity in allowance for credit losses by portfolio segment [Roll Forward]          
Balance, beginning of period $ 140,200 $ 120,500 $ 116,000 $ 114,400 $ 114,400
Allowance for credit loss on PCD acquired loans     7,726    
Charge-offs (6,396) (6,077) (18,982) (18,384) (25,728)
Recoveries 2,096 2,157 5,767 6,086  
Provision 3,100 2,920 28,489 17,398  
Balance, end of period 139,000 119,500 139,000 119,500 116,000
Commercial Loans [Member]          
Activity in allowance for credit losses by portfolio segment [Roll Forward]          
Balance, beginning of period 66,021 46,708 45,453 45,903 45,903
Allowance for credit loss on PCD acquired loans     7,355    
Charge-offs (655) (1,117) (3,410) (2,401)  
Recoveries 224 275 740 765  
Provision 220 1,372 15,672 2,971  
Balance, end of period 65,810 47,238 65,810 47,238 45,453
Consumer Loans [Member]          
Activity in allowance for credit losses by portfolio segment [Roll Forward]          
Balance, beginning of period 40,869 47,918 43,987 46,427 46,427
Allowance for credit loss on PCD acquired loans     0    
Charge-offs (5,020) (4,926) (14,733) (15,835)  
Recoveries 1,809 1,789 4,781 4,999  
Provision 2,135 835 5,758 10,025  
Balance, end of period 39,793 45,616 39,793 45,616 43,987
Residential [Member]          
Activity in allowance for credit losses by portfolio segment [Roll Forward]          
Balance, beginning of period 33,310 25,874 26,560 22,070 22,070
Allowance for credit loss on PCD acquired loans     371    
Charge-offs (721) (34) (839) (148) (211)
Recoveries 63 93 246 322  
Provision 745 713 7,059 4,402  
Balance, end of period $ 33,397 $ 26,646 $ 33,397 $ 26,646 $ 26,560