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Borrowings (Federal Home Loan Bank Advances Maturity Schedule) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]    
Federal Home Loan Bank advances $ 145,000 $ 593,859
Federal Home Loan Bank of Boston [Member]    
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]    
Scheduled Maturity, Next 12 months 110,000  
Scheduled Maturity, Year Two 35,000  
Scheduled Maturity, Year Three 0  
Scheduled Maturity, Year Four 0  
Scheduled Maturity, Year Five 0  
Scheduled Maturity, Thereafter 0  
Federal Home Loan Bank advances $ 145,000 $ 593,900
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due [Abstract]    
Weighted Average Rate, Next 12 months 0.35%  
Weighted Average Rate, Year Two 0.45%  
Weighted Average Rate, Year Three 0.00%  
Weighted Average Rate, Year Four 0.00%  
Weighted Average Rate, Year Five 0.00%  
Weighted Average Rate, Thereafter 0.00%  
Weighted Average Rate, Total 0.38%