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Borrowings (Federal Home Loan Bank Advances Maturity Schedule) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Advance from Federal Home Loan Bank, Fiscal Year Maturity [Abstract]    
Federal Home Loan Bank advances $ 1,240,000 $ 1,190,000
Federal Home Loan Bank of Boston [Member]    
Advance from Federal Home Loan Bank, Fiscal Year Maturity [Abstract]    
Scheduled maturity through the end of the current year 600,000  
Scheduled maturity in year two 305,000  
Scheduled maturity in year three 165,000  
Scheduled maturity in year four 45,000  
Scheduled maturity in year five 125,000  
Scheduled maturity after year five 0  
Federal Home Loan Bank advances $ 1,240,000 $ 1,200,000
Federal Home Loan Bank, Advances, Weighted Average Interest Rate [Abstract]    
Weighted average rate for scheduled maturity through the end of the current year 5.37%  
Weighted average rate for scheduled maturity in year two 4.94%  
Weighted average rate for scheduled maturity in year three 4.54%  
Weighted average rate for scheduled maturity in year four 4.24%  
Weighted average rate for scheduled maturity in year five 4.15%  
Weighted average rate for scheduled maturity after year five 0.00%  
Total weighted average rate 4.99%