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Derivative Instruments - Hedge Derivatives (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jul. 25, 2018
Dec. 31, 2017
Derivative [Line Items]            
Closed Portfolio and Beneficial Interest, Last-of-Layer, Amortized Cost $ 1.7   $ 1.7      
Notional Amount         $ 375,000,000  
Not Designated as Hedging Instrument            
Derivative [Line Items]            
Description of Location of Gain (Loss) on Interest Rate Derivative on Income Statement     Other noninterest income      
Derivative, Gain (Loss) on Derivative, Net (14,000) $ 1,000 $ (34,000) $ 13,000    
Notional Amount 1,637,594,000   1,637,594,000     $ 1,497,250,000
Hedging derivative | Cash flow hedge            
Derivative [Line Items]            
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss) $ 950,000 1,161,000 $ 2,670,000 1,068,000    
Hedging derivative | Fair value hedge            
Derivative [Line Items]            
Weighted Average Remaining Maturity     3 years 9 months 22 days      
Pay Rate (as percent) 2.82%   2.82%      
Forecasted Notional Amount $ 679,145,000   $ 679,145,000     0
Fair Value Hedge Assets $ 1,358,000   $ 1,358,000     0
Description of Location of Gain (Loss) on Interest Rate Derivative on Income Statement     Interest income on securities      
Hedging derivative | Fair value hedge | Loans            
Derivative [Line Items]            
Weighted Average Remaining Maturity     2 years 9 months 4 days      
Pay Rate (as percent) 2.79%   2.79%      
Receive Rate     3 month LIBOR      
Forecasted Notional Amount $ 525,000,000   $ 525,000,000     0
Fair Value Hedge Assets 1,122,000   1,122,000     0
Derivative Instruments and Hedges, Assets [1] 523,878,000   523,878,000     0
Fair Value Hedging Adjustment [1] (1,122,000)   $ (1,122,000)     0
Description of Location of Gain (Loss) on Interest Rate Derivative on Income Statement     Interest income on loans      
Description of Location of Interest Rate Fair Value Hedge Derivative on Balance Sheet     Other assets      
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge (1,122,000) 0 $ (1,122,000) 0    
Gain (Loss) on Fair Value Hedges Recognized in Earnings $ 1,122,000 0 $ 1,122,000 0    
Hedging derivative | Fair value hedge | Securities            
Derivative [Line Items]            
Weighted Average Remaining Maturity     7 years 4 months 21 days      
Pay Rate (as percent) 2.89%   2.89%      
Receive Rate     3 month LIBOR      
Forecasted Notional Amount $ 154,145,000   $ 154,145,000     0
Fair Value Hedge Assets 236,000   236,000     0
Derivative Instruments and Hedges, Assets 153,543,000   153,543,000     0
Fair Value Hedging Adjustment (236,000)   $ (236,000)     0
Description of Location of Gain (Loss) on Interest Rate Derivative on Income Statement     Interest income on securities      
Description of Location of Interest Rate Fair Value Hedge Derivative on Balance Sheet     Other assets      
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge 1,343,000 0 $ (236,000) 0    
Gain (Loss) on Fair Value Hedges Recognized in Earnings $ (1,343,000) $ 0 $ 236,000 $ 0    
Asset derivatives | Hedging derivative | Cash flow hedge            
Derivative [Line Items]            
Description of Location of Interest Rate Derivatives on Balance Sheet     Other assets      
Weighted Average Remaining Maturity     2 years 7 months 6 days      
Pay Rate (as percent) 2.48%   2.48%      
Receive Rate     3 month LIBOR      
Forecasted Notional Amount $ 101,000,000   $ 101,000,000     0
Cash Flow Hedges Derivative Instruments at Fair Value, Net $ 618,000   $ 618,000     0
Liability derivatives | Hedging derivative | Cash flow hedge            
Derivative [Line Items]            
Description of Location of Interest Rate Derivatives on Balance Sheet     Other assets      
Weighted Average Remaining Maturity     3 years 10 months 6 days      
Pay Rate (as percent) 3.09%   3.09%      
Receive Rate     3 month LIBOR      
Forecasted Notional Amount $ 99,000,000   $ 99,000,000     200,000,000
Cash Flow Hedges Derivative Instruments at Fair Value, Net $ (1,005,000)   $ (1,005,000)     $ (4,583,000)
[1] The carrying amount as shown represents the designated last-of-layer. At June 30, 2018, the total amortized cost basis of the closed portfolio of loans designated in this hedging relationship was $1.7 billion.