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Commitments and Contingencies (Details) - USD ($) $ in Thousands | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013
Guarantor Obligations [Line Items] |  |  |  |  |  |
FDIC Indemnification Asset | $ 9,276 | $ 5,808 | $ 28,701 | $ 45,140 | $ 49,959 | $ 93,397
FDIC loss share payable | 124,038 |  | 116,535 |  |  |
Commitments to Extend Credit |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Unused Commitments to Extend Credit | 7,760,000 |  | 7,190,000 |  |  |
Qualified Affordable Housing Project Investments, Commitment | 32,000 |  | 16,800 |  |  |
Standby Letters of Credit |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Guarantor obligations amount | $ 85,200 |  | 77,400 |  |  |
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 | $ 3,100 |  | $ 3,200 |  |  |

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