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Commitments and Contingencies (Details) $ in Thousands | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) Advances | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Guarantor Obligations [Line Items] |  |  |  |  |  |
Qualified Affordable Housing Project Investments | $ 151,500 |  | $ 128,000 |  |  |
FDIC shared-loss payable | $ 104,576 | $ 103,487 | 101,342 | $ 100,203 | $ 99,126 | $ 97,008
Number Of Federal Home Loan Bank Advances | Advances |  |  |  |  |  |
Commitments to Extend Credit |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Unused Commitments to Extend Credit | $ 9,801,361 |  | 9,629,365 |  |  |
Qualified Affordable Housing Project Investments, Commitment | 74,777 |  | 61,819 |  |  |
Standby Letters of Credit |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Guarantor obligations amount | $ 87,858 |  | 81,530 |  |  |
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 | $ 885 |  | $ 882 |  |  |

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