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Derivatives, Hedging Activities, and Other Financial Instruments - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Derivative [Line Items]      
Collateral already posted, fair value $ 4,900   $ 4,100
Derivative liability 3,000   $ 1,800
Interest Rate Swap      
Derivative [Line Items]      
Income (expense) in fair value adjustments $ (54) $ 2