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Borrowings (Federal Home Loan Bank Advances Maturity Schedule) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Advance from Federal Home Loan Bank, Fiscal Year Maturity [Abstract]    
Federal Home Loan Bank advances $ 1,120,000 $ 980,000
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 215,000  
Scheduled maturity in year two 265,000  
Scheduled maturity in year three 305,000  
Scheduled maturity in year four 165,000  
Scheduled maturity in year five 45,000  
Scheduled maturity after year five 125,000  
Federal Home Loan Bank advances $ 1,120,000 $ 980,000
Federal Home Loan Bank, Advances, Weighted Average Interest Rate [Abstract]    
Weighted average rate for scheduled maturity through the end of the current year 5.53%  
Weighted average rate for scheduled maturity in year two 5.03%  
Weighted average rate for scheduled maturity in year three 4.94%  
Weighted average rate for scheduled maturity in year four 4.54%  
Weighted average rate for scheduled maturity in year five 4.24%  
Weighted average rate for scheduled maturity after year five 4.15%  
Total weighted average rate 4.90%