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Borrowings (Federal Home Loan Bank Advances Maturity Schedule) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]    
Federal Home Loan Bank advances $ 791,356 $ 848,930
Federal Home Loan Bank of Boston [Member]    
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]    
Scheduled Maturity, Next 12 months 465,634  
Scheduled Maturity, Year Two 137,258  
Scheduled Maturity, Year Three 67,033  
Scheduled Maturity, Year Four 51,222  
Scheduled Maturity, Year Five 55,447  
Scheduled Maturity, Thereafter 14,762  
Federal Home Loan Bank advances $ 791,356 $ 848,930
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due [Abstract]    
Weighted Average Rate, Next 12 months 1.51%  
Weighted Average Rate, Year Two 1.62%  
Weighted Average Rate, Year Three 1.95%  
Weighted Average Rate, Year Four 2.43%  
Weighted Average Rate, Year Five 3.58%  
Weighted Average Rate, Thereafter 2.44%  
Weighted Average Rate, Total 1.85%