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Commitments and Contingencies Outstanding Commitments to Extend Credit and Letters of Credit (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Residential Mortgage Principal Balance Repurchase Request Received $ 851 $ 543
Residential Mortgage Principal Balance FHLB Credit Enhancement 132,000  
Residential Mortgage Repurchase Reserves FHLB Credit Enhancement 1,800 2,300
Commitments to Extend Credit [Member] | Reserve for Off-balance Sheet Activities [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Valuation allowances and Reserves, Balance 5,635,629 4,389,064
Standby Letters of Credit [Member] | Reserve for Off-balance Sheet Activities [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Valuation allowances and Reserves, Balance 390,501 382,465
Commercial Letters of Credit [Member] | Reserve for Off-balance Sheet Activities [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Valuation allowances and Reserves, Balance 36,365 32,304
Residential Mortgage [Member] | Reserve for Off-balance Sheet Activities [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Valuation allowances and Reserves, Balance $ 2,500 $ 3,200