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Borrowings (Federal Home Loan Bank Advances Maturity Schedule) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]    
Federal Home Loan Bank advances $ 1,190,000 $ 980,000
Federal Home Loan Bank of Boston [Member]    
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]    
Scheduled maturity, Year One 550,000  
Scheduled maturity, Year Two 305,000  
Scheduled maturity, Year Three 165,000  
Scheduled maturity, Year Four 45,000  
Scheduled maturity, Year Five 125,000  
Scheduled maturity, Thereafter 0  
Federal Home Loan Bank advances $ 1,190,000 $ 980,000
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due [Abstract]    
Weighted average rate, Year One 5.30%  
Weighted average rate, Year Two 4.94%  
Weighted average rate, Year Three 4.54%  
Weighted average rate, Year Four 4.24%  
Weighted average rate, Year Five 4.15%  
Weighted average rate, Thereafter 0.00%  
Weighted average rate, Total 4.94%