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Borrowings (Summary of Short term and Long term Borrowings and Subordinated Debentures) (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Securities Sold under Agreements to Repurchase $ 175,621 $ 200,657
Total short-term borrowings 500,621 $ 485,607
Customer repurchase agreements(1)    
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]    
2025 175,621  
2026 0  
2027 0  
2028 0  
2029 0  
Thereafter 0  
FHLBB and correspondent bank overnight borrowings(2)    
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]    
2025 325,000  
2026 0  
2027 0  
2028 0  
2029 0  
Thereafter 0  
BTFP    
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]    
2025 0  
2026 0  
2027 0  
2028 0  
2029 0  
Thereafter $ 0  
Subordinated Debt and Junior Subordinated Debt    
Debt Instrument [Line Items]    
Weighted Average Rate (as a percent) 4.73% 4.79%
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]    
2025 $ 0  
2026 0  
2027 0  
2028 0  
2029 0  
Thereafter 44,331  
Total long-term borrowings 44,331 $ 44,331
Short-term Debt    
Debt Instrument [Line Items]    
Total short-term borrowings $ 500,621 $ 485,607
Weighted Average Rate (as a percent) 3.57% 3.66%
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]    
2025 $ 500,621  
2026 0  
2027 0  
2028 0  
2029 0  
Thereafter 0  
Short-term Debt | Customer repurchase agreements(1)    
Debt Instrument [Line Items]    
Securities Sold under Agreements to Repurchase $ 175,621 $ 200,657
Weighted Average Rate (as a percent) 1.64% 1.56%
Short-term Debt | FHLBB and correspondent bank overnight borrowings(2)    
Debt Instrument [Line Items]    
FHLBB and correspondent bank overnight borrowings $ 325,000 $ 149,950
Weighted Average Rate (as a percent) 4.62% 5.53%
Short-term Debt | BTFP    
Debt Instrument [Line Items]    
FHLBB and correspondent bank overnight borrowings $ 0 $ 135,000
Weighted Average Rate (as a percent) 0.00% 4.70%
Subsidiary One [Member] | Junior Subordinated Debt    
Debt Instrument [Line Items]    
Weighted Average Rate (as a percent) 4.58% 4.82%
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]    
2025 $ 0  
2026 0  
2027 0  
2028 0  
2029 0  
Thereafter 36,083  
Total long-term borrowings $ 36,083 $ 36,083
Subsidiary Two [Member] | Junior Subordinated Debt    
Debt Instrument [Line Items]    
Weighted Average Rate (as a percent) 5.38% 4.65%
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]    
2025 $ 0  
2026 0  
2027 0  
2028 0  
2029 0  
Thereafter 8,248  
Total long-term borrowings $ 8,248 $ 8,248