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Borrowings (Federal Home Loan Bank Advances Maturity Schedule) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]    
Federal Home Loan Bank advances $ 378,973 $ 406,297
Federal Home Loan Bank of Boston [Member]    
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]    
Scheduled Maturity, next 12 months 141,292  
Scheduled Maturity, year two 37,575  
Scheduled Maturity, year three 83,134  
Scheduled Maturity, year four 42,661  
Scheduled Maturity, year five 27,733  
Scheduled Maturity, thereafter 46,578  
Federal Home Loan Bank advances $ 378,973 $ 406,297
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due [Abstract]    
Weighted Average Rate, next 12 months 0.68%  
Weighted Average Rate, year two 2.52%  
Weighted Average Rate, year three 2.26%  
Weighted Average Rate, year four 3.79%  
Weighted Average Rate, year five 2.30%  
Weighted Average Rate, thereafter 4.16%  
Weighted Average Rate, Total 2.11%