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Commitments and Contingencies (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Guarantor Obligations [Line Items] |  |  |
Amortization Method Qualified Affordable Housing Project Investments | $ 167,800 | $ 147,300 |
FDIC shared-loss payable | 112,395 | 105,618 | $ 101,342
Commitments to Extend Credit |  |  |
Guarantor Obligations [Line Items] |  |  |
Unused Commitments to Extend Credit | 10,682,378 | 10,054,712 |
Amortization Method Qualified Affordable Housing Project Investments | 70,000 | 68,000 |
Standby Letters of Credit |  |  |
Guarantor Obligations [Line Items] |  |  |
Affordable Housing Program Obligation | $ 99,601 | $ 96,467 |

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