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Derivatives, Hedging Activities, and Other Financial Instruments - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Derivative [Line Items]      
Collateral already posted, fair value $ 51,700   $ 13,700
Derivative liability 48,900   10,700
Interest rate derivative liabilities, at fair value 624    
Unrealized loss cash flow hedge 547 $ 0  
Interest Rate Swap      
Derivative [Line Items]      
Income (expense) in fair value adjustments 303 $ 54  
Not Designated as Hedging Instrument      
Derivative [Line Items]      
Derivative, notional amount 490,800   $ 337,600
Designated as Hedging Instrument | Interest Rate Swap      
Derivative [Line Items]      
Derivative, notional amount $ 10,000