Business Combinations (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 18, 2012	Dec. 31, 2012
Business Acquisition Other Details [Abstract]
Effective Tax Rate Business Acquisition		30.00%
Life Insurance, Corporate or Bank Owned, Change in Value		$ 29.1
Net interest income business acquired		3.7
Business Combination, Acquisition Related Costs		7.1
BusinessAcquisitionEntityAcquiredAndReasonForAcquisitionAbstract
Business Acquisition, Description of Acquired Entity	On December 18, 2012, the Group purchased from BBVA, all
Business Acquisition Date Of Acquisition Agreement1		Apr. 30, 2010
Business Acquisition Effective Date Of Acquisition1		Apr. 29, 2011
BusinessAcquisitionCostOfAcquiredEntityPurchasePrice		500
FDIC-Assisted Acquisition and FDIC Shared-Loss Indemnification Asset [Abstract]
Percent Of Losses Fdic Absorbs		80.00%
Percent Of Losses Recoveries Fdic Shares		80.00%
Acquisition Date		Apr. 30, 2010
Completed Date		Apr. 29, 2011
True-Up Payment Description		Under the shared-loss agreements, the Bank will pay to the FDIC 50% of the excess, if any, of: (i) 20% of the Intrinsic Loss Estimate of $906.0 million (or $181.2 million) (as determined by the FDIC) less (ii) the sum of: (A) 25% of the asset discount (per bid) (or $227.5 million); plus (B) 25% of the cumulative shared-loss payments (defined as the aggregate of all of the payments made or payable to the Bank minus the aggregate of all of the payments made or payable to the FDIC); plus (C) the sum of the period servicing amounts for every consecutive twelve-month period prior to and ending on the True-Up Measurement Date in respect of each of the shared-loss agreements during which the shared-loss provisions of the applicable shared-loss agreement is in effect (defined as the product of the simple average of the principal amount of shared-loss loans and shared-loss assets at the beginning and end of such period times 1%).
FDIC Clawback Liability		$ 13.3