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Loans and Allowance for Credit Losses Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance     $ 293,404,000    
Loans charged off $ (14,007,000) $ (4,787,000) (24,959,000) $ (21,690,000)  
Recoveries of loans previously charged off 2,705,000 2,816,000 5,059,000 5,715,000  
Net loans (charged off) recovered (11,302,000) (1,971,000) (19,900,000) (15,975,000)  
Provision for credit losses 10,005,000 10,718,000 23,087,000 34,051,000  
Ending balance 375,941,000   375,941,000   $ 293,404,000
Loans - Excluding OBS Credit Exposure          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 297,888,000 278,695,000 293,404,000 269,366,000 269,366,000
CECL Day 1 Provision(1) 23,444,000   23,444,000    
PCD Loans credit discount 55,906,000   55,906,000    
Loans charged off (14,007,000) (4,787,000) (24,959,000) (21,690,000)  
Recoveries of loans previously charged off 2,705,000 2,816,000 5,059,000 5,715,000  
Net loans (charged off) recovered (11,302,000) (1,971,000) (19,900,000) (15,975,000)  
Provision for credit losses 10,005,000 10,718,000 23,087,000 34,051,000  
Ending balance 375,941,000 287,442,000 375,941,000 287,442,000 293,404,000
Loans - Excluding OBS Credit Exposure | Real estate - commercial mortgage          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 114,492,000 66,256,000 112,565,000 69,456,000 69,456,000
CECL Day 1 Provision(1) 6,108,000   6,108,000    
PCD Loans credit discount 32,157,000   32,157,000    
Loans charged off (7,853,000) (230,000) (7,879,000) (13,592,000)  
Recoveries of loans previously charged off 146,000 29,000 298,000 815,000  
Net loans (charged off) recovered (7,707,000) (201,000) (7,581,000) (12,777,000)  
Provision for credit losses 11,115,000 6,247,000 12,916,000 15,623,000  
Ending balance 156,165,000 72,302,000 156,165,000 72,302,000 112,565,000
Loans - Excluding OBS Credit Exposure | Commercial and Industrial          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 76,883,000 77,126,000 74,266,000 70,116,000 70,116,000
CECL Day 1 Provision(1) 1,484,000   1,484,000    
PCD Loans credit discount 20,869,000   20,869,000    
Loans charged off (2,955,000) (2,017,000) (10,587,000) (2,629,000)  
Recoveries of loans previously charged off 796,000 988,000 2,044,000 2,074,000  
Net loans (charged off) recovered (2,159,000) (1,029,000) (8,543,000) (555,000)  
Provision for credit losses (2,454,000) (908,000) 6,547,000 5,628,000  
Ending balance 94,623,000 75,189,000 94,623,000 75,189,000 74,266,000
Loans - Excluding OBS Credit Exposure | Real estate - residential mortgage          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 73,216,000 86,209,000 73,286,000 83,250,000 83,250,000
CECL Day 1 Provision(1) 14,922,000   14,922,000    
PCD Loans credit discount 565,000   565,000    
Loans charged off (35,000) (62,000) (286,000) (62,000)  
Recoveries of loans previously charged off 122,000 58,000 238,000 106,000  
Net loans (charged off) recovered 87,000 (4,000) (48,000) 44,000  
Provision for credit losses 924,000 2,644,000 989,000 5,555,000  
Ending balance 89,714,000 88,849,000 89,714,000 88,849,000 73,286,000
Loans - Excluding OBS Credit Exposure | Consumer and Home Equity          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 16,688,000 27,303,000 17,604,000 26,429,000 26,429,000
CECL Day 1 Provision(1) 444,000   444,000    
PCD Loans credit discount 357,000   357,000    
Loans charged off (1,766,000) (1,313,000) (4,004,000) (3,519,000)  
Recoveries of loans previously charged off 1,161,000 959,000 1,837,000 1,620,000  
Net loans (charged off) recovered (605,000) (354,000) (2,167,000) (1,899,000)  
Provision for credit losses 649,000 2,033,000 1,295,000 4,452,000  
Ending balance 17,533,000 28,982,000 17,533,000 28,982,000 17,604,000
Loans - Excluding OBS Credit Exposure | Real-estate - construction          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 12,966,000 11,646,000 12,295,000 10,743,000 10,743,000
CECL Day 1 Provision(1) 486,000   486,000    
PCD Loans credit discount 1,958,000   1,958,000    
Loans charged off 0 0 0 0  
Recoveries of loans previously charged off 233,000 569,000 233,000 771,000  
Net loans (charged off) recovered 233,000 569,000 233,000 771,000  
Provision for credit losses (1,033,000) (1,071,000) (362,000) (370,000)  
Ending balance 14,610,000 11,144,000 14,610,000 11,144,000 12,295,000
Loans - Excluding OBS Credit Exposure | Leases and other loans          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 3,643,000 10,155,000 3,388,000 9,372,000 9,372,000
CECL Day 1 Provision(1) 0   0    
PCD Loans credit discount 0   0    
Loans charged off (1,398,000) (1,165,000) (2,203,000) (1,888,000)  
Recoveries of loans previously charged off 247,000 213,000 409,000 329,000  
Net loans (charged off) recovered (1,151,000) (952,000) (1,794,000) (1,559,000)  
Provision for credit losses 804,000 1,773,000 1,702,000 3,163,000  
Ending balance $ 3,296,000 $ 10,976,000 $ 3,296,000 $ 10,976,000 $ 3,388,000