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Derivatives (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Derivative [Line Items]          
Notional amount of derivatives $ 2,564,737   $ 2,564,737   $ 2,342,791
Ineffective portion of change in derivative fair value     0 $ 0  
Derivative income reflected in the income statement 2,700 $ 500 3,100 400  
Impact to interest income from cash flow hedges (200) 700 (100) 1,000  
Aggregate fair value of derivatives in a net liability position 16,800   16,800    
Noninterest income 67,487 63,694 130,978 121,880  
Deposits 18,364 $ 12,603 31,183 $ 24,336  
Derivatives Designated as Hedging Instruments [Member]          
Derivative [Line Items]          
Notional amount of derivatives 1,113,000   1,113,000   1,100,000
Interest Rate Swaps [Member]          
Derivative [Line Items]          
Noninterest income     100    
Deposits     400    
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member]          
Derivative [Line Items]          
Notional amount of derivatives 750,000   750,000   $ 1,100,000
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 3, Expires 2019 [Member]          
Derivative [Line Items]          
Notional amount of derivatives 250,000   250,000    
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 4, Expires 2020 [Member]          
Derivative [Line Items]          
Notional amount of derivatives 200,000   200,000    
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 5, Expires 2022 [Member]          
Derivative [Line Items]          
Notional amount of derivatives $ 300,000   $ 300,000    
Derivative maturity expiration year     2022    
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Date Two [Member] | Swap Agreement 3, Expires 2019 [Member]          
Derivative [Line Items]          
Derivative maturity expiration year     2019    
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Date Three [Member] | Swap Agreement 4, Expires 2020 [Member]          
Derivative [Line Items]          
Derivative maturity expiration year     2020