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Loans and Allowance for Credit Losses - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance $ 293,404 $ 269,366 $ 249,001
Loans charged off 54,429 39,201 21,472
Recoveries of loans previously charged off 9,984 10,129 14,092
Provision for credit losses 71,636 54,036 28,021
Ending balance 379,156 293,404 $ 269,366
Loans - Excluding OBS Credit Exposure      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance   269,366  
Beginning balance 293,404    
Loans charged off 54,429 39,201  
Recoveries of loans previously charged off 9,984 10,129  
Net loans recovered (charged off) (44,445) (29,072)  
Provision for credit losses 52,122 53,110  
Ending balance 379,156 293,404  
Financing Receivable, Provision Expense 23,444    
Allowance for credit losses at acquisition 54,631    
Real estate - commercial mortgage | Loans - Excluding OBS Credit Exposure      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance   69,456  
Beginning balance 112,565    
Loans charged off 13,186 17,999  
Recoveries of loans previously charged off 603 1,076  
Net loans recovered (charged off) (12,583) (16,923)  
Provision for credit losses 9,992 60,032  
Ending balance 158,181 112,565  
Financing Receivable, Provision Expense 6,648    
Allowance for credit losses at acquisition 41,559    
Commercial and Industrial | Loans - Excluding OBS Credit Exposure      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance   70,116  
Beginning balance 74,266    
Loans charged off 26,585 9,246  
Recoveries of loans previously charged off 4,440 3,473  
Net loans recovered (charged off) (22,145) (5,773)  
Provision for credit losses 28,507 9,923  
Ending balance 92,212 74,266  
Financing Receivable, Provision Expense 1,121    
Allowance for credit losses at acquisition 10,463    
Real-estate - home equity | Loans - Excluding OBS Credit Exposure      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance   26,429  
Beginning balance 17,604    
Loans charged off 8,490 7,514  
Recoveries of loans previously charged off 3,357 3,198  
Net loans recovered (charged off) (5,133) (4,316)  
Provision for credit losses 6,124 (4,509)  
Ending balance 19,397 17,604  
Financing Receivable, Provision Expense 445    
Allowance for credit losses at acquisition 357    
Real estate – residential mortgage | Loans - Excluding OBS Credit Exposure      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance   83,250  
Beginning balance 73,286    
Loans charged off 1,472 62  
Recoveries of loans previously charged off 472 421  
Net loans recovered (charged off) (1,000) 359  
Provision for credit losses (6,440) (10,323)  
Ending balance 81,331 73,286  
Financing Receivable, Provision Expense 14,920    
Allowance for credit losses at acquisition 565    
Real-estate - construction | Loans - Excluding OBS Credit Exposure      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance   10,743  
Beginning balance 12,295    
Loans charged off 0 0  
Recoveries of loans previously charged off 382 858  
Net loans recovered (charged off) 382 858  
Provision for credit losses 10,466 694  
Ending balance 25,140 12,295  
Financing Receivable, Provision Expense 310    
Allowance for credit losses at acquisition 1,687    
Leases and other loans | Loans - Excluding OBS Credit Exposure      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance   9,372  
Beginning balance 3,388    
Loans charged off 4,696 4,380  
Recoveries of loans previously charged off 730 1,103  
Net loans recovered (charged off) (3,966) (3,277)  
Provision for credit losses 3,473 (2,707)  
Ending balance 2,895 $ 3,388  
Financing Receivable, Provision Expense 0    
Allowance for credit losses at acquisition $ 0