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Derivative Financial Instruments and Hedging Activities - Offsetting of Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | $ 1,603 | $ 375
Gross Amounts Offset in the Statements of Condition | 0 | 0
Net Amounts of Liabilities Presented in the Statements of Condition | 1,603 | 375
Gross Amounts Not Offset in the Statements of Condition, Financial Instruments | 0 | (161)
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Pledged | (1,603) | 0
Net Amount | 0 | 214
Interest rate swap | Other liabilities |  |
Offsetting Liabilities [Line Items] |  |
Accrued interest on derivative liability interest swaps | 4 | 3
Counterparty A |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 1,603 | 375
Gross Amounts Offset in the Statements of Condition | 0 | 0
Net Amounts of Liabilities Presented in the Statements of Condition | 1,603 | 375
Gross Amounts Not Offset in the Statements of Condition, Financial Instruments | 0 | (161)
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Pledged | (1,603) | 0
Net Amount | $ 0 | $ 214

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