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Borrowings (Federal Home Loan Bank Advances Maturity Schedule) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]    
Federal Home Loan Bank advances $ 848,930 $ 378,973
Federal Home Loan Bank of Boston [Member]    
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]    
Scheduled Maturity, Next 12 months 420,075  
Scheduled Maturity, Year Two 98,134  
Scheduled Maturity, Year Three 137,258  
Scheduled Maturity, Year Four 72,033  
Scheduled Maturity, Year Five 51,222  
Scheduled Maturity, Thereafter 70,208  
Federal Home Loan Bank advances $ 848,930 $ 379,000
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due [Abstract]    
Weighted Average Rate, Next 12 months 0.89%  
Weighted Average Rate, Year Two 1.36%  
Weighted Average Rate, Year Three 1.65%  
Weighted Average Rate, Year Four 1.95%  
Weighted Average Rate, Year Five 2.50%  
Weighted Average Rate, Thereafter 3.81%  
Weighted Average Rate, Total 1.49%