Commitments and Contingencies Outstanding Commitments to Extend Credit and Letters of Credit (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Residential Mortgage Principal Balance Repurchase Request Received	$ 918	$ 543
Residential Mortgage Principal Balance FHLB Credit Enhancement	140,000
Residential Mortgage Repurchase Reserves FHLB Credit Enhancement	2,100	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	5,071,983	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	387,996	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	35,769	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	$ 2,900	$ 3,200