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Derivative Financial Instruments and Hedging Activities - Offsetting of Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Interest rate swap | Other assets    
Offsetting Assets [Line Items]    
Accrued interest on derivative asset interest rate swaps $ 1 $ 1
Counterparty A    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 38 55
Gross Amounts Offset in the Statements of Condition 0 0
Net Amounts of Assets Presented in the Statements of Condition 38 55
Gross Amounts Not Offset in the Statements of Condition, Financial Instruments (38) (55)
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Received 0 0
Net Amount $ 0 $ 0