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Allowance for Credit Losses - Activity in ACL by Class of Loans and Leases (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
Rollforward of the Allowance for Credit Losses          
Balance at beginning of period $ 167,825 $ 160,517 $ 160,393 $ 156,533 $ 156,533
Charge-offs (6,405) (5,770) (18,232) (16,392)  
Recoveries 2,199 1,837 6,958 6,151  
Provision (benefit) 1,650 7,116 16,150 17,408  
Balance at end of period 165,269 163,700 165,269 163,700 160,393
Commercial Lending          
Rollforward of the Allowance for Credit Losses          
Charge-offs     (3,915)   (4,015)
Commercial and Industrial          
Rollforward of the Allowance for Credit Losses          
Balance at beginning of period 20,061 14,713 16,332 14,956 14,956
Charge-offs (1,106) (1,178) (3,253) (2,764) (3,615)
Recoveries 410 160 1,009 621  
Provision (benefit) (281) (470) 4,996 412  
Balance at end of period 19,084 13,225 19,084 13,225 16,332
Commercial Real Estate          
Rollforward of the Allowance for Credit Losses          
Balance at beginning of period 39,264 44,412 40,624 43,944 43,944
Charge-offs   (400)   (400) (400)
Recoveries     251    
Provision (benefit) (424) 1 (2,035) 469  
Balance at end of period 38,840 44,013 38,840 44,013 40,624
Construction          
Rollforward of the Allowance for Credit Losses          
Balance at beginning of period 8,945 9,331 8,570 10,392 10,392
Provision (benefit) (557) 481 (182) (580)  
Balance at end of period 8,388 9,812 8,388 9,812 8,570
Lease financing          
Rollforward of the Allowance for Credit Losses          
Balance at beginning of period 2,343 2,352 2,269 1,754 1,754
Charge-offs (580)   (662)    
Provision (benefit) 752 (62) 908 536  
Balance at end of period 2,515 2,290 2,515 2,290 2,269
Residential mortgage          
Rollforward of the Allowance for Credit Losses          
Balance at beginning of period 37,965 46,152 39,230 36,880 36,880
Charge-offs     (30)    
Recoveries 14 31 143 89  
Provision (benefit) (248) (3,287) (1,642) 5,927  
Balance at end of period 37,731 42,896 37,731 42,896 39,230
Residential mortgage | Home Equity Line          
Rollforward of the Allowance for Credit Losses          
Charge-offs     (30)    
Home Equity Line          
Rollforward of the Allowance for Credit Losses          
Balance at beginning of period 11,190 9,183 10,205 11,728 11,728
Charge-offs     (30)    
Recoveries 26 86 122 242  
Provision (benefit) 168 1,268 1,087 (1,433)  
Balance at end of period 11,384 10,537 11,384 10,537 10,205
Consumer          
Rollforward of the Allowance for Credit Losses          
Balance at beginning of period 48,057 34,374 43,163 36,879 36,879
Charge-offs (4,719) (4,192) (14,287) (13,228) (18,002)
Recoveries 1,749 1,560 5,433 5,199  
Provision (benefit) 2,240 9,185 13,018 12,077  
Balance at end of period $ 47,327 $ 40,927 $ 47,327 $ 40,927 $ 43,163