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Borrowings (Federal Home Loan Bank Advances Maturity Schedule, Modification) (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, year two 37,575  
Scheduled Maturity, year three 83,134  
Scheduled Maturity, year four 42,661  
Scheduled Maturity, year five 27,733  
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, 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, Total 2.11%  
Federal Home Loan Bank of Boston [Member] | Original Terms of FHLBB Advance Modification [Member]    
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]    
Scheduled Maturity, year two $ 10,000  
Scheduled Maturity, year three 35,000  
Scheduled Maturity, year four 14,403  
Scheduled Maturity, year five 0  
Scheduled Maturity, year six 0  
Schedule Maturity, year seven 0  
Schedule Maturity, year eight 0  
Federal Home Loan Bank advances $ 59,403  
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due [Abstract]    
Weighted Average Rate, year two 3.29%  
Weighted Average Rate, year three 3.14%  
Weighted Average Rate, year four 4.46%  
Weighted Average Rate, year five 0.00%  
Weighted Average Rate, year six 0.00%  
Weighted Average Rate, year seven 0.00%  
Weighted Average Rate, year eight 0.00%  
Weighted Average Rate, Total 3.48%  
Federal Home Loan Bank of Boston [Member] | Revised Terms of FHLBB Advance Modification [Member]    
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]    
Scheduled Maturity, year two $ 0  
Scheduled Maturity, year three 0  
Scheduled Maturity, year four 0  
Scheduled Maturity, year five 5,000  
Scheduled Maturity, year six 20,000  
Schedule Maturity, year seven 25,830  
Schedule Maturity, year eight 8,573  
Federal Home Loan Bank advances $ 59,403  
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due [Abstract]    
Weighted Average Rate, year two 0.00%  
Weighted Average Rate, year three 0.00%  
Weighted Average Rate, year four 0.00%  
Weighted Average Rate, year five 2.71%  
Weighted Average Rate, year six 2.63%  
Weighted Average Rate, year seven 3.06%  
Weighted Average Rate, year eight 3.90%  
Weighted Average Rate, Total 3.01%