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Commitments and Contingencies (Details) $ in Thousands | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) Advances | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Guarantor Obligations [Line Items] |  |  |  |  |  |
Qualified Affordable Housing Project Investments | $ 127,400 |  | $ 109,810 |  |  |
FDIC shared-loss receivable | 3,766 | $ 3,981 | 4,172 | $ 5,281 | $ 7,474 | $ 4,054
FDIC shared-loss payable | 99,126 |  | 97,008 |  |  |
Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate | $ 200,000 |  |  |  |  |
Number Of Federal Home Loan Bank Advances | Advances | 2 |  |  |  |  |
Commitments to Extend Credit |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Unused Commitments to Extend Credit | $ 9,189,347 |  | 8,808,218 |  |  |
Qualified Affordable Housing Project Investments, Commitment | 67,363 |  | 57,079 |  |  |
Standby Letters of Credit |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Guarantor obligations amount | $ 81,099 |  | $ 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 | $ 3,000 |  |  |  |  |
Each Individual Advance |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate | $ 100,000 |  |  |  |  |

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