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Borrowings (Federal Home Loan Bank Advances Maturity Schedule) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]    
Federal Home Loan Bank advances $ 1,141,464 $ 950,722
Federal Home Loan Bank of Boston [Member]    
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]    
Scheduled Maturity, Next 12 months 974,033  
Scheduled Maturity, Year Two 77,222  
Scheduled Maturity, Year Three 813  
Scheduled Maturity, Year Four 5,238  
Scheduled Maturity, Year Five 40,900  
Scheduled Maturity, Thereafter 43,258  
Federal Home Loan Bank advances $ 1,141,464 $ 950,700
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due [Abstract]    
Weighted Average Rate, Next 12 months 2.07%  
Weighted Average Rate, Year Two 2.52%  
Weighted Average Rate, Year Three 5.12%  
Weighted Average Rate, Year Four 3.80%  
Weighted Average Rate, Year Five 2.51%  
Weighted Average Rate, Thereafter 3.29%  
Weighted Average Rate, Total 2.17%