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Derivative Financial Instruments and Hedging Activities - Offsetting of Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Offsetting Assets [Line Items] |  |
Gross Amounts of Recognized Assets | $ 0 | $ 161
Gross Amounts Offset in the Statements of Condition | 0 | 0
Net Amounts of Assets Presented in the Statements of Condition | 0 | 161
Gross Amounts Not Offset in the Statements of Condition, Financial Instruments | 0 | (161)
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Received | 0 | 0
Net Amount | 0 | 0
Counterparty A |  |
Offsetting Assets [Line Items] |  |
Gross Amounts of Recognized Assets | 0 | 161
Gross Amounts Offset in the Statements of Condition | 0 | 0
Net Amounts of Assets Presented in the Statements of Condition | 0 | 161
Gross Amounts Not Offset in the Statements of Condition, Financial Instruments | 0 | (161)
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Received | 0 | 0
Net Amount | $ 0 | $ 0

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