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Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities (Investments in Tax Credit and Other Investments, Net) (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) credit | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) credit | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Investments in Tax Credit and Other Investments, Net [Line Items] |  |  |  |  |
Investments in tax credit and other investments, net | $ 251,318,000 |  | $ 251,318,000 |  | $ 254,140,000
Accrued expenses and other liabilities — Unfunded commitments | 106,969,000 |  | 106,969,000 |  | 113,515,000
Amortization expense of tax credit and other investments | 24,759,000 | $ 16,739,000 | 42,084,000 | $ 41,644,000 |
Unrealized gains recognized on equity securities with readily determinable fair values | 720,000 | 375,000 | 758,000 | 767,000 |
Equity securities without readily determinable fair values | 18,800,000 |  | 18,800,000 |  | 19,100,000
Adjustments to equity securities without readily determinable fair values | 0 | 0 | 0 | 0 |
AFS debt securities | 3,884,574,000 |  | 3,884,574,000 |  | 3,317,214,000
Collateralized loan obligations (“CLOs”) |  |  |  |  |
Investments in Tax Credit and Other Investments, Net [Line Items] |  |  |  |  |
AFS debt securities | 273,979,000 |  | 273,979,000 |  | 284,706,000
Tax credit investments |  |  |  |  |
Investments in Tax Credit and Other Investments, Net [Line Items] |  |  |  |  |
Equity securities with readily determinable fair values | 31,100,000 |  | 31,100,000 |  | $ 31,700,000
Amortization of tax credit and other investments |  |  |  |  |
Investments in Tax Credit and Other Investments, Net [Line Items] |  |  |  |  |
Tax Credit Investments, Pre-tax Impairment Recovery | 109,000 | 0 | $ 259,000 | 0 |
OTTI charge | $ 733,000 | $ 2,900,000 |  | $ 9,900,000 |
Historic Tax Credit Investment |  |  |  |  |
Investments in Tax Credit and Other Investments, Net [Line Items] |  |  |  |  |
Number of recovered historic tax credit investments | credit | 1 |  | 2 |  |
CRA Investment |  |  |  |  |
Investments in Tax Credit and Other Investments, Net [Line Items] |  |  |  |  |
Number of recovered historic tax credit investments | credit | 1 |  |  |  |

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- Definition Represents the net amount of investments in the projects, excluding affordable housing projects, that qualify for Community Reinvestment Act (CRA) credits or other types of tax credits. + References No definition available. + Details
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