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Derivative Financial Instruments and Hedging Activities - Offsetting of Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities $ 740 $ 933
Gross Amounts Offset in the Statements of Condition 0 0
Net Amounts of Liabilities Presented in the Statements of Condition 740 933
Gross Amounts Not Offset in the Statements of Condition, Financial Instruments (74) (55)
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Pledged (666) (878)
Net Amount 0 0
Other liabilities | Interest rate swap    
Offsetting Liabilities [Line Items]    
Derivative liabilities, accrued interest, interest rate swaps 8 12
Counterparty A    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 740 933
Gross Amounts Offset in the Statements of Condition 0
Net Amounts of Liabilities Presented in the Statements of Condition 740 933
Gross Amounts Not Offset in the Statements of Condition, Financial Instruments (74) (55)
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Pledged (666) (878)
Net Amount $ 0 $ 0