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Derivative Instruments - Non-hedge Derivatives (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Derivative [Line Items]          
Description of Location of Gain (Loss) on Interest Rate Derivative on Income Statement Other noninterest income Other noninterest income Other noninterest income Other noninterest income  
Derivative, Gain (Loss) on Derivative, Net $ (44) $ (8) $ (146) $ (42)  
Notional Amount 2,539,760   2,539,760   $ 2,119,448
Estimated Fair Value $ (274)   $ (274)   $ (128)
Assets          
Derivative [Line Items]          
Description of Location of Interest Rate Derivatives on Balance Sheet Other assets   Other assets   Other assets
Notional Amount $ 1,269,880   $ 1,269,880   $ 1,059,724
Estimated Fair Value $ 56,846   $ 56,846   $ 22,273
Liabilities          
Derivative [Line Items]          
Description of Location of Interest Rate Derivatives on Balance Sheet Other liabilities   Other liabilities   Other liabilities
Notional Amount $ 1,269,880   $ 1,269,880   $ 1,059,724
Estimated Fair Value $ (57,120)   $ (57,120)   $ (22,401)