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Commitments and Contingencies (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Guarantor Obligations [Line Items] |  |  |
Amortization Method Qualified Affordable Housing Project Investments | $ 147,300 | $ 128,000 |
FDIC shared-loss payable | 105,618 | 101,342 | $ 97,008
Commitments to Extend Credit |  |  |
Guarantor Obligations [Line Items] |  |  |
Unused Commitments to Extend Credit | 10,054,712 | 9,629,365 |
Affordable Housing Program Obligation | 67,952 | 61,819 |
Standby Letters of Credit |  |  |
Guarantor Obligations [Line Items] |  |  |
Guarantor obligations amount | $ 96,467 | 81,530 |
Obligation to Repurchase Receivables Sold |  |  |
Guarantor Obligations [Line Items] |  |  |
Reserve for estimated losses arising from repurchase of loans |  | $ 882 |

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