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Commitments and Contingencies (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Guarantor Obligations [Line Items] |  |  |  |
Amortization Method Qualified Affordable Housing Project Investments | $ 128,000 | $ 109,800 |  |
FDIC loss share receivable | 2,223 | 4,172 | $ 4,054 | $ 28,701
FDIC shared-loss payable | 101,342 | 97,008 |  |
Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate | 200,000 |  |  |
Gain On Termination of Forward Starting Advance | 12,500 |  |  |
Commitments to Extend Credit |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Unused Commitments to Extend Credit | 9,629,365 | 8,808,218 |  |
Affordable Housing Program Obligation | 61,819 | 57,079 |  |
Standby Letters of Credit |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Guarantor obligations amount | $ 81,530 | 83,750 |  |
Recourse Obligation on Mortgage Loans Sold |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Recourse Period, Maximum1 | 180 days |  |  |
Obligation to Repurchase Receivables Sold |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Reserve for estimated losses arising from repurchase of loans | $ 882 | $ 3,000 |  |
Each Individual Advance |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate | $ 100,000 |  |  |

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- Definition Amount of investment in qualified affordable housing projects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64813897&loc=SL49122993-202985 + Details
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