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Derivative Financial Instruments (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2009
Derivative Financial Instruments                
Notional Amount $ 2,001,184,000 $ 841,724,000 $ 2,001,184,000 $ 841,724,000        
Estimated Fair Value Gain     24,402,000 10,015,000        
Estimated Fair Value Loss     $ 43,373,000 10,035,000        
Variable rate basis, variable rate receivable on notional amount     three-month LIBOR          
After-tax unrealized gain on cash flow hedge in other comprehensive income 4,100,000 26,000 $ 15,200,000 128,000        
Ineffectiveness in the cash flow hedge 0 0 0 0        
Gain or loss recorded 0 0 0 0        
Interest Rate Derivative Assets, at Fair Value 21,700,000   21,700,000          
Interest Rate Derivative Liabilities, at Fair Value 23,500,000   23,500,000          
Interest Rate Derivatives, at Fair Value, Net 1,800,000 226,000 1,800,000 226,000        
Estimated gain (loss) on fair value of open contracts related to mortgage servicing rights     2,100,000 (392,000)        
Junior Subordinated Debt                
Derivative Financial Instruments                
Collateral provided   300,000   300,000        
FHLB Advances                
Derivative Financial Instruments                
Collateral provided 28,200,000   28,200,000          
Other Liabilities.                
Derivative Financial Instruments                
Cash flow hedge liability 19,600,000 82,000 19,600,000 82,000        
Mortgage loan pipeline                
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments                
Obligation 148,749,000 74,898,000 148,749,000 74,898,000     $ 50,442,000  
Expected closures                
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments                
Obligation 111,561,000 56,174,000 111,561,000 56,174,000     37,832,000  
Cash flow hedge | Borrower                
Derivative Financial Instruments                
Collateral provided 64,000,000.0   64,000,000.0          
Cash flow hedge | FHLB Advances - One                
Derivative Financial Instruments                
Notional Amount           $ 350,000,000    
Outstanding advances           350,000,000    
Cash flow hedge | FHLB Advances - Two                
Derivative Financial Instruments                
Notional Amount           150,000,000    
Outstanding advances           150,000,000    
Cash flow hedge | FHLB Advances - Three                
Derivative Financial Instruments                
Notional Amount         $ 200,000,000      
Interest rate contracts                
Derivative Financial Instruments                
Notional Amount 1,000,000.0 684,300,000 1,000,000.0 684,300,000        
Mortgage servicing rights hedging | Non-designated hedges                
Derivative Financial Instruments                
Notional Amount 134,000,000.0 63,500,000 134,000,000.0 63,500,000        
Mortgage servicing rights hedging | Non-designated hedges | Other Liabilities.                
Derivative Financial Instruments                
Notional Amount 134,000,000 63,500,000 134,000,000 63,500,000        
Estimated Fair Value Loss     86,000 493,000        
Mortgage loan pipeline commitments                
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments                
Obligation 2,071,000 392,000 2,071,000 392,000     705,000  
Forward commitments                
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments                
Obligation 145,625,000 83,068,000 145,625,000 83,068,000     54,533,000  
Fair value of forward commitments (631,000) (355,000) (631,000) (355,000)     $ 621,000  
Forward commitments | Non-designated hedges | Other Assets.                
Derivative Financial Instruments                
Notional Amount 145,625,000 83,068,000 145,625,000 83,068,000        
Estimated Fair Value Gain     2,702,000 747,000        
Interest rate swap | LIBOR                
Derivative Financial Instruments                
Notional Amount 8,000,000.0   8,000,000.0          
Interest rate swap | Cash flow hedge                
Derivative Financial Instruments                
Notional Amount               $ 8,000,000.0
Interest rate swap | Cash flow hedge | FHLB Advances - One                
Derivative Financial Instruments                
Notional Amount           350,000,000    
Fixed rate payable on notional amount (as a percent)         2.44%      
Interest rate swap | Cash flow hedge | FHLB Advances - Two                
Derivative Financial Instruments                
Notional Amount           $ 150,000,000    
Fixed rate payable on notional amount (as a percent)         2.21%      
Interest rate swap | Cash flow hedge | FHLB Advances - Three                
Derivative Financial Instruments                
Notional Amount         $ 200,000,000      
Fixed rate payable on notional amount (as a percent)         1.89%      
Interest rate swap | Cash flow hedge | Other Liabilities. | Counterparty                
Derivative Financial Instruments                
Notional Amount   8,000,000   8,000,000        
Estimated Fair Value Loss       82,000        
Interest rate swap | Cash flow hedge | Other Liabilities. | FHLB Advances | Counterparty                
Derivative Financial Instruments                
Notional Amount $ 700,000,000   700,000,000          
Estimated Fair Value Loss     $ 19,564,000          
Interest rate swap | Cash flow hedge | LIBOR                
Derivative Financial Instruments                
Fixed rate payable on notional amount (as a percent) 4.06%   4.06%          
Interest rate swap | Cash flow hedge | LIBOR | FHLB Advances - One                
Derivative Financial Instruments                
Variable rate (as a percent) 2.16%   2.16%          
Interest rate swap | Cash flow hedge | LIBOR | FHLB Advances - Two                
Derivative Financial Instruments                
Variable rate (as a percent) 2.10%   2.10%          
Interest rate swap | Cash flow hedge | LIBOR | FHLB Advances - Three                
Derivative Financial Instruments                
Variable rate (as a percent) 2.14%   2.14%          
Interest rate swap | Fair Value Hedging | Counterparty                
Derivative Financial Instruments                
Notional Amount $ 2,800,000   $ 2,800,000          
Interest rate swap | Fair Value Hedging | Other Assets and Other Liabilities | Counterparty                
Derivative Financial Instruments                
Notional Amount 2,769,000 2,824,000 2,769,000 2,824,000        
Estimated Fair Value Gain       33,000        
Estimated Fair Value Loss     260,000          
Interest rate swap | Non-designated hedges | Other Assets and Other Liabilities | Borrower                
Derivative Financial Instruments                
Notional Amount 509,395,000 342,166,000 509,395,000 342,166,000        
Estimated Fair Value Gain     21,700,000 193,000        
Estimated Fair Value Loss     63,000 9,460,000        
Interest rate swap | Non-designated hedges | Other Assets and Other Liabilities | Counterparty                
Derivative Financial Instruments                
Notional Amount $ 509,395,000 $ 342,166,000 509,395,000 342,166,000        
Estimated Fair Value Gain       $ 9,042,000        
Estimated Fair Value Loss     $ 23,400,000