v3.25.1
Loans and Allowance for Credit Losses - Allowance for Credit Loss Activity (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period $ 101,494 $ 107,966 $ 107,966
Provision for credit losses on loans (2,511) 3,425  
Charge-offs (884) (6,939) (12,188)
Recoveries 911 350  
Net Charge-offs 27 (6,589)  
Balance at End of Period 99,010 104,802 101,494
Commercial Loans | Commercial real estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 30,254 37,886 37,886
Provision for credit losses on loans (493) 2,838  
Charge-offs 0 (5,205) (5,205)
Recoveries 134 93  
Net Charge-offs 134 (5,112)  
Balance at End of Period 29,895 35,612 30,254
Commercial Loans | Commercial and industrial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 37,084 34,538 34,538
Provision for credit losses on loans (3,643) 680  
Charge-offs (172) (1,128) (2,436)
Recoveries 145 117  
Net Charge-offs (27) (1,011)  
Balance at End of Period 33,414 34,207 37,084
Commercial Loans | Commercial construction      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 4,893 5,382 5,382
Provision for credit losses on loans 1,017 (233)  
Charge-offs (30) 0 0
Recoveries 0 0  
Net Charge-offs (30) 0  
Balance at End of Period 5,880 5,149 4,893
Commercial Loans | Business banking      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 10,681 12,858 12,858
Provision for credit losses on loans 650 (995)  
Charge-offs (143) (98) (1,745)
Recoveries 25 33  
Net Charge-offs (118) (65)  
Balance at End of Period 11,213 11,798 10,681
Consumer Loans | Consumer real estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 15,776 14,663 14,663
Provision for credit losses on loans 160 859  
Charge-offs (162) (139) (1,348)
Recoveries 133 27  
Net Charge-offs (29) (112)  
Balance at End of Period 15,907 15,410 15,776
Consumer Loans | Other consumer      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 2,806 2,639 2,639
Provision for credit losses on loans (202) 276  
Charge-offs (377) (369) (1,454)
Recoveries 474 80  
Net Charge-offs 97 (289)  
Balance at End of Period $ 2,701 $ 2,626 $ 2,806