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Derivative Financial Instruments and Hedging Derivative Table - Gross notional and fair value amounts of derivatives (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Derivative [Line Items]    
Notional Values $ 1,303,185 $ 1,022,925
Asset Derivatives 37,661 44,806
Liability Derivatives 22,181 30,128
Credit Risk Contract    
Derivative [Line Items]    
Notional Values 595,785 598,141
Asset Derivatives 31,948 41,232
Liability Derivatives 18,210 27,655
Foreign currency forward contracts    
Derivative [Line Items]    
Notional Values 992 683
Liability Derivatives 0 5
Interest Risk, Interest Rate Lock Commitments    
Derivative [Line Items]    
Notional Values 225,374 156,309
Asset Derivatives 5,560 3,384
Interest Risk, Forward Delivery Contracts    
Derivative [Line Items]    
Notional Values 82,696 52,054
Asset Derivatives   11
Liability Derivatives 16 8
Interest Risk, TBA Mortgage Backed Securities    
Derivative [Line Items]    
Notional Values 270,750 136,750
Asset Derivatives 153 179
Liability Derivatives 839 150
Interest Risk, Interest Rate Swaps    
Derivative [Line Items]    
Notional Values 127,588 78,988
Liability Derivatives 3,116 2,310
Interest Rate Risk    
Derivative [Line Items]    
Notional Values 706,408 424,101
Asset Derivatives 5,713 3,574
Liability Derivatives 3,971 2,468
Credit Default Swap, Selling Protection | Credit Risk Contract    
Derivative [Line Items]    
Notional Values 297,612 297,612
Asset Derivatives 31,948 41,126
Credit Default Swap, Buying Protection | Credit Risk Contract    
Derivative [Line Items]    
Notional Values 298,173 300,529
Asset Derivatives   106
Liability Derivatives $ 18,210 $ 27,655