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Borrowings (Schedule of Advances to the Federal Home Loan Bank) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items]    
FHLBB borrowings $ 25,000  
Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Two 10,000  
FHLB advances, carrying value of residential real estate and commercial loans pledged as collateral 1,100,000  
FHLB advances, securities pledged as collateral 172 $ 215
Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Three   10,000
Federal Home Loan Bank Advances $ 35,000 $ 307,150
Long-term Debt [Member]    
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items]    
Debt, Weighted Average Interest Rate 2.19% 2.03%
Short-term Debt    
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items]    
Debt, Weighted Average Interest Rate 1.43% 1.10%
Short Term Borrowing Maturing January 2018 [Member]    
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items]    
FHLBB borrowings   $ 247,150
Short Term Borrowing Maturing January 2017 [Member] | Short-term Debt | Minimum [Member]    
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank Advances Maturities Summary Fixed Interest Rate Within One Year From Balance Sheet Date 1.45%  
Short Term Borrowing Maturing January 2017 [Member] | Short-term Debt | Maximum [Member]    
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank Advances Maturities Summary Fixed Interest Rate Within One Year From Balance Sheet Date 1.63%  
Short Term Borrowing Maturing February 2018 [Member]    
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items]    
FHLBB borrowings   $ 50,000
FHLBB Borrowings [Member]    
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items]    
Debt, Weighted Average Interest Rate 1.87% 1.87%
FHLBB Borrowings [Member] | Long-term Debt [Member]    
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items]    
Debt, Weighted Average Interest Rate 1.87% 1.87%
FHLBB Borrowings [Member] | Long-term Debt [Member]    
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items]    
Long-term Federal Home Loan Bank Advances $ 10,000 $ 10,000
FHLBB Borrowings [Member] | Short-term Debt    
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items]    
FHLBB borrowings $ 25,000 $ 250,000
Debt, Weighted Average Interest Rate 2.71% 1.54%