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Borrowings (Federal Home Loan Bank Advances Maturity Schedule) (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]    
Federal Home Loan Bank advances $ 626,000 $ 1,125,000
Federal Home Loan Bank of Boston    
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]    
Scheduled maturity, Year 1 390,000  
Scheduled maturity, Year 2 60,000  
Scheduled maturity, Year 3 90,000  
Scheduled maturity, Year 4 80,000  
Scheduled maturity, Year 5 6,000  
Scheduled maturity, Thereafter 0  
Federal Home Loan Bank advances $ 626,000 $ 1,100,000
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due [Abstract]    
Weighted average rate, Year 1 4.26%  
Weighted average rate, Year 2 4.12%  
Weighted average rate, Year 3 4.33%  
Weighted average rate, Year 4 3.82%  
Weighted average rate, Year 5 3.33%  
Weighted average rate, Thereafter 0.00%  
Weighted average rate, Total 4.19%