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Derivative Instruments - Hedge Derivatives (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Oct. 24, 2018
Derivative [Line Items]        
Closed Portfolio and Beneficial Interest, Last-of-Layer, Amortized Cost $ 2,700,000,000      
Weighted Average Remaining Maturity Derivative 4 years 6 months 4 days      
Pay Rate (as percent) 2.88%      
Description of Location of Gain (Loss) on Interest Rate Derivative on Income Statement Other noninterest income      
Derivative, Gain (Loss) on Derivative, Net $ (33,000) $ 39,000 $ 65,000  
Notional amount 1,377,905,000 0    
Fair Value Hedges, Net (21,833,000) 0    
Cash flow hedge        
Derivative [Line Items]        
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income 1,000,000      
Notional amount       $ 101,000,000
Hedging derivative | Fair value hedge | Loans        
Derivative [Line Items]        
Derivative Instruments and Hedges, Assets [1] 907,037,000 0    
Fair Value Hedging Adjustment [1] 7,037,000 0    
Hedging derivative | Fair value hedge | Securities        
Derivative [Line Items]        
Derivative Instruments and Hedges, Assets 513,116,000 0    
Fair Value Hedging Adjustment 14,796,000 0    
Liability derivatives | Hedging derivative | Cash flow hedge        
Derivative [Line Items]        
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income $ 2,660,000 2,487,000 (749,000)  
Description of Location of Interest Rate Derivatives on Balance Sheet Other liabilities      
Weighted Average Remaining Maturity Derivative 3 years 4 months 2 days      
Pay Rate (as percent) 3.09%      
Receive Rate 3 month LIBOR      
Cash Flow Hedges Derivative Instruments at Fair Value, Net $ (1,757,000) (4,583,000)    
Notional amount $ 99,000,000 200,000,000    
Liability derivatives | Hedging derivative | Fair value hedge | Loans        
Derivative [Line Items]        
Description of Location of Interest Rate Derivatives on Balance Sheet Other liabilities      
Weighted Average Remaining Maturity Derivative 2 years 7 months 17 days      
Pay Rate (as percent) 2.77%      
Receive Rate 3 month LIBOR      
Description of Location of Gain (Loss) on Interest Rate Derivative on Income Statement Interest income on loans      
Gain (Loss) on Fair Value Hedges Recognized in Earnings $ (7,037,000) 0 0  
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge 7,037,000 0 0  
Notional amount 900,000,000 0    
Fair Value Hedges, Net $ (7,037,000) 0    
Liability derivatives | Hedging derivative | Fair value hedge | Securities        
Derivative [Line Items]        
Description of Location of Interest Rate Derivatives on Balance Sheet Other liabilities      
Weighted Average Remaining Maturity Derivative 8 years 15 days      
Pay Rate (as percent) 3.08%      
Receive Rate 3 month LIBOR      
Description of Location of Gain (Loss) on Interest Rate Derivative on Income Statement Interest income on securities      
Gain (Loss) on Fair Value Hedges Recognized in Earnings $ (14,796,000) 0 0  
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge 14,796,000 0 $ 0  
Notional amount 477,905,000 0    
Fair Value Hedges, Net $ (14,796,000) $ 0    
[1] (1)The carrying amount as shown represents the designated last-of-layer. At December 31, 2018, the total amortized cost basis of the closed portfolio of loans designated in these hedging relationships was $2.7 billion.