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Derivative Financial Instruments and Hedging Activities - Offsetting of Assets (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets $ 74,000 $ 55,000
Offset in the Statements of Condition 0 0
Net Amounts of Assets Presented in the Statements of Condition 74,000 55,000
Derivative, Collateral, Obligation to Return Securities (74,000) (55,000)
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Received 0 0
Net Amount 0 0
Other assets | Interest rate swap    
Offsetting Assets [Line Items]    
Derivative assets, accrued interest, interest rate swaps 300 1,000
Counterparty A    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 74,000 55,000
Offset in the Statements of Condition 0
Net Amounts of Assets Presented in the Statements of Condition 74,000 55,000
Derivative, Collateral, Obligation to Return Securities (74,000) (55,000)
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Received 0
Net Amount $ 0 $ 0