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Derivative Financial Instruments (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2009
Derivative Financial Instruments          
Notional Amount $ 2,051,663,000 $ 889,162,000      
Outstanding advances 700,000,000.0 150,000,000.0      
Estimated Fair Value Gain 16,252,000 5,090,000      
Estimated Fair Value Loss $ 31,273,000 4,421,000      
Variable rate basis, variable rate receivable on notional amount three-month LIBOR        
After-tax unrealized gain on cash flow hedge in other comprehensive income $ 10,700,000 154,000      
Cash flow hedge liability   48,000      
Ineffectiveness in the cash flow hedge 0 0      
Gain or loss recorded 0 0      
Interest Rate Derivative Assets, at Fair Value 15,300,000 3,800,000      
Interest Rate Derivative Liabilities, at Fair Value 16,500,000 4,300,000      
Interest Rate Derivatives, at Fair Value, Net 1,100,000 499,000      
Other Liabilities.          
Derivative Financial Instruments          
Cash flow hedge liability 13,800,000        
Junior Subordinated Debt          
Derivative Financial Instruments          
Collateral provided 300,000        
FHLB Advances          
Derivative Financial Instruments          
Collateral provided 22,600,000        
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 80,785,000 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 60,588,000 37,832,000      
Cash flow hedge | Borrower          
Derivative Financial Instruments          
Collateral provided 26,400,000        
Cash flow hedge | FHLB Advances - One          
Derivative Financial Instruments          
Notional Amount       $ 350,000,000  
Outstanding advances       150,000,000  
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     $ 200,000,000 350,000,000  
Interest rate contracts          
Derivative Financial Instruments          
Notional Amount 1,100,000 737,000,000.0      
Interest rate contracts | LIBOR          
Derivative Financial Instruments          
Notional Amount $ 8,000,000.0        
Interest rate contracts | Cash flow hedge          
Derivative Financial Instruments          
Notional Amount         $ 8,000,000.0
Interest rate contracts | Cash flow hedge | LIBOR          
Derivative Financial Instruments          
Fixed rate payable on notional amount (as a percent) 4.06%        
Mortgage servicing rights hedging          
Derivative Financial Instruments          
Estimated gain (loss) on fair value of open contracts related to mortgage servicing rights $ 789,000 (1,200,000)      
Mortgage servicing rights hedging | Non-designated hedges          
Derivative Financial Instruments          
Notional Amount 133,000,000.0 94,500,000      
Mortgage servicing rights hedging | Non-designated hedges | Other Assets.          
Derivative Financial Instruments          
Notional Amount 133,000,000 94,500,000      
Estimated Fair Value Gain   1,184,000      
Estimated Fair Value Loss 789,000        
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 1,160,000 705,000      
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 87,773,000 46,812,000      
Fair value of forward commitments 258,000 621,000      
Forward commitments | Non-designated hedges | Other Assets.          
Derivative Financial Instruments          
Notional Amount 87,773,000 46,812,000      
Estimated Fair Value Gain 902,000 83,000      
Interest rate swap          
Derivative Financial Instruments          
Estimated Fair Value Gain   207,000      
Estimated Fair Value Loss 646,000        
Interest rate swap | Cash flow hedge | Other Liabilities. | Counterparty          
Derivative Financial Instruments          
Notional Amount 8,000,000.0 8,000,000      
Estimated Fair Value Loss   48,000      
Interest rate swap | Cash flow hedge | FHLB Advances | Other Liabilities. | Counterparty          
Derivative Financial Instruments          
Notional Amount 700,000,000        
Estimated Fair Value Loss $ 13,791,000        
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 | LIBOR | FHLB Advances - One          
Derivative Financial Instruments          
Variable rate (as a percent) 1.91%        
Interest rate swap | Cash flow hedge | LIBOR | FHLB Advances - Two          
Derivative Financial Instruments          
Variable rate (as a percent) 1.96%        
Interest rate swap | Cash flow hedge | LIBOR | FHLB Advances - Three          
Derivative Financial Instruments          
Variable rate (as a percent) 1.91%        
Interest rate swap | Fair Value Hedging | Counterparty          
Derivative Financial Instruments          
Notional Amount $ 2,800,000        
Interest rate swap | Fair Value Hedging | Other Assets. | Counterparty          
Derivative Financial Instruments          
Notional Amount 2,754,000 2,824,000      
Estimated Fair Value Loss 199,000 51,000      
Interest rate swap | Non-designated hedges | Other Assets and Other Liabilities | Borrower          
Derivative Financial Instruments          
Notional Amount 564,068,000 368,513,000      
Estimated Fair Value Gain 15,277,000 3,105,000      
Estimated Fair Value Loss 1,019,000 4,193,000      
Interest rate swap | Non-designated hedges | Other Assets and Other Liabilities | Counterparty          
Derivative Financial Instruments          
Notional Amount 564,068,000 368,513,000      
Estimated Fair Value Gain 73,000 718,000      
Estimated Fair Value Loss 15,475,000 129,000      
Foreign exchange contract          
Derivative Financial Instruments          
Gain or loss recorded $ 0 $ 0