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Derivative Instruments and Hedging Activity - Interest Rate Derivatives (Details) - Interest Rate Swap [Member] Unit_Standard_pure_T33SsbyF2EC9zsHjDPwM6w in Thousands, $ in Thousands | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
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Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Interest Rate Derivatives, Number of Instruments | 12 | 10
Interest Rate Derivatives, Notional Amount | $ 240,000 | $ 258,543

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