FDIC Indemnification Indemnification Asset and True-up Payment Obligation and FDIC shared-loss expense (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
FDIC-Assisted Acquisition [Abstract]
Percent Of Losses Fdic Absorbs	80.00%
Percent Of Losses Recoveries Fdic Shares	80.00%
FDIC Assisted Transaction Description	Also in connection with the FDIC-assisted acquisition, the Bank agreed to make a true-up payment, also known as clawback liability or clawback provision, to the FDIC on the date that is 45 days following the last day (such day, the “True-Up Measurement Date”) of the final shared-loss month, or upon the final disposition of all covered assets under the shared-loss agreements in the event losses thereunder fail to reach expected levels. 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%). The estimated liability is included within accrued expenses and other liabilities in the consolidated statements of financial condition. This true-up payment obligation may increase if actual and expected losses decline. The Company measures the true-up payment obligation at fair value. The changes in fair value are included as change in true-up payment obligation within FDIC shared-loss expense, net in the consolidated statements of operations.
Change in additional amortization of the FDIC indemnification asset	$ 2.5	$ 2.8	$ 11.1

FDIC Indemnification Indemnification Asset and True-up Payment Obligation and FDIC shared-loss expense (Narrative) (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2015

Dec. 31, 2014

Dec. 31, 2013

FDIC-Assisted Acquisition [Abstract]

Percent Of Losses Fdic Absorbs

80.00%

Percent Of Losses Recoveries Fdic Shares

80.00%

FDIC Assisted Transaction Description

Also in connection with the FDIC-assisted acquisition, the Bank agreed to make a true-up payment, also known as clawback liability or clawback provision, to the FDIC on the date that is 45 days following the last day (such day, the “True-Up Measurement Date”) of the final shared-loss month, or upon the final disposition of all covered assets under the shared-loss agreements in the event losses thereunder fail to reach expected levels. 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%). The estimated liability is included within accrued expenses and other liabilities in the consolidated statements of financial condition. This true-up payment obligation may increase if actual and expected losses decline. The Company measures the true-up payment obligation at fair value. The changes in fair value are included as change in true-up payment obligation within FDIC shared-loss expense, net in the consolidated statements of operations.

Change in additional amortization of the FDIC indemnification asset

$ 2.5

$ 2.8

$ 11.1