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Derivatives, Hedging Activities, and Other Financial Instruments - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Derivative [Line Items]          
Collateral already posted, fair value $ 16,800   $ 16,800   $ 4,100
Derivative liability 15,200   15,200   1,800
Interest Rate Swap          
Derivative [Line Items]          
Income (expense) in fair value adjustments (407) $ (78) (602) $ (76)  
Not Designated as Hedging Instrument          
Derivative [Line Items]          
Derivative, notional amount $ 249,300   $ 249,300   $ 59,300