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Commitments and Contingencies (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Guarantor Obligations [Line Items] |  |  |  |
Amortization Method Qualified Affordable Housing Project Investments | $ 85,600 | $ 57,100 |  |
FDIC loss share receivable | 4,054 | 28,701 | $ 93,397 | $ 270,192
FDIC loss share payable | 126,453 | 116,535 |  |
Commitments to Extend Credit |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Unused Commitments to Extend Credit | 7,950,000 | 7,190,000 |  |
Affordable Housing Program Obligation | 41,800 | 16,800 |  |
Standby Letters of Credit |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Guarantor obligations amount | $ 77,939 | 77,374 |  |
Recourse Obligation on Mortgage Loans Sold |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Recourse Period, Maximum1 | 120 days |  |  |
Obligation to Repurchase Receivables Sold |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Reserve for estimated losses arising from repurchase of loans | $ 3,000 | $ 3,203 |  |

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