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Derivative Instruments - Non-hedge Derivatives (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Derivative [Line Items]          
Gain on cash flow hedges reclassified from other comprehensive income into net income, net of tax $ 73 $ (143) $ (183) $ (284)  
Not Designated as Hedging Instrument          
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 $ (89) $ (14) $ (102) $ (34)  
Notional Amount 2,265,708   2,265,708   $ 2,119,448
Estimated Fair Value (230)   $ (230)   $ (128)
Not Designated as Hedging Instrument | Assets          
Derivative [Line Items]          
Description of Location of Interest Rate Derivatives on Balance Sheet     Other assets   Other assets
Notional Amount 1,132,854   $ 1,132,854   $ 1,059,724
Estimated Fair Value 41,659   $ 41,659   $ 22,273
Not Designated as Hedging Instrument | Liabilities          
Derivative [Line Items]          
Description of Location of Interest Rate Derivatives on Balance Sheet     Other liabilities   Other liabilities
Notional Amount 1,132,854   $ 1,132,854   $ 1,059,724
Estimated Fair Value $ (41,889)   $ (41,889)   $ (22,401)