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Derivatives, Hedging Activities, and Other Financial Instruments - Notional and Fair Value of Derivatives Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Other assets |  |
Derivative [Line Items] |  |
Credit risk derivative asset, fair value | $ 14,477 | $ 1,722
Other liabilities |  |
Derivative [Line Items] |  |
Credit risk derivative liability, fair value | $ 15,170 | $ 1,813

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