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Derivative Financial Instruments and Hedging Activities - Offsetting of Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Interest rate swap | Other liabilities |  |
Offsetting Liabilities [Line Items] |  |
Accrued interest on derivative liability interest swaps | $ 3 | $ 8
Counterparty A |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 163 | 740
Gross Amounts Offset in the Statements of Condition | 0 | 0
Net Amounts of Liabilities Presented in the Statements of Condition | 163 | 740
Gross Amounts Not Offset in the Statements of Condition, Financial Instruments | (163) | (74)
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Pledged |  | (666)
Net Amount | $ 0 | $ 0

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