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Loans and Allowance for Credit Losses - Allowance for Credit Loss Activity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period $ 105,757 $ 98,085 $ 101,340 $ 98,576
Provision for credit losses on loans 6,159 2,309 15,860 2,804
Charge-offs (4,077) (1,239) (20,758) (9,899)
Recoveries 367 529 11,196 8,213
Net (Charge-offs)/Recoveries (3,710) (710) (9,562) (1,686)
Balance at End of Period 108,206 99,694 108,206 99,694
Impact of adopting ASU 2022-02        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period     568  
Commercial Loans | Commercial real estate        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period 40,837 45,314 41,428 50,700
Provision for credit losses on loans (1,081) (2,997) (2,636) (8,471)
Charge-offs 0 (628) 0 (827)
Recoveries 1 145 965 432
Net (Charge-offs)/Recoveries 1 (483) 965 (395)
Balance at End of Period 39,757 41,834 39,757 41,834
Commercial Loans | Commercial real estate | Impact of adopting ASU 2022-02        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period     0  
Commercial Loans | Commercial and industrial        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period 28,328 21,516 25,710 19,727
Provision for credit losses on loans 6,068 3,806 14,424 4,573
Charge-offs (3,033) 0 (18,253) (5,797)
Recoveries 161 6 9,568 6,835
Net (Charge-offs)/Recoveries (2,872) 6 (8,685) 1,038
Balance at End of Period 31,524 25,338 31,524 25,338
Commercial Loans | Commercial and industrial | Impact of adopting ASU 2022-02        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period     75  
Commercial Loans | Commercial construction        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period 6,739 6,583 6,264 5,355
Provision for credit losses on loans 93 (1,159) 351 68
Charge-offs 0 0 0 0
Recoveries 0 0 2 1
Net (Charge-offs)/Recoveries 0 0 2 1
Balance at End of Period 6,832 5,424 6,832 5,424
Commercial Loans | Commercial construction | Impact of adopting ASU 2022-02        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period     215  
Commercial Loans | Business banking        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period 13,616 12,157 12,547 11,338
Provision for credit losses on loans (15) 950 1,325 3,158
Charge-offs (590) (178) (1,252) (1,924)
Recoveries 90 242 230 599
Net (Charge-offs)/Recoveries (500) 64 (1,022) (1,325)
Balance at End of Period 13,101 13,171 13,101 13,171
Commercial Loans | Business banking | Impact of adopting ASU 2022-02        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period     251  
Consumer Loans | Consumer real estate        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period 13,418 9,673 12,105 8,733
Provision for credit losses on loans 896 1,075 1,934 2,083
Charge-offs (107) (161) (224) (299)
Recoveries 42 39 156 109
Net (Charge-offs)/Recoveries (65) (122) (68) (190)
Balance at End of Period 14,249 10,626 14,249 10,626
Consumer Loans | Consumer real estate | Impact of adopting ASU 2022-02        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period     278  
Consumer Loans | Other consumer        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period 2,819 2,842 3,286 2,723
Provision for credit losses on loans 198 634 462 1,393
Charge-offs (347) (272) (1,029) (1,052)
Recoveries 73 97 275 237
Net (Charge-offs)/Recoveries (274) (175) (754) (815)
Balance at End of Period $ 2,743 $ 3,301 2,743 $ 3,301
Consumer Loans | Other consumer | Impact of adopting ASU 2022-02        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period     $ (251)