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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) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Investments in Tax Credit and Other Investments, Net [Line Items] |  |  |  |  |
Investments in tax credit and other investments, net | $ 254,512,000 |  | $ 254,512,000 |  | $ 254,140,000
Accrued expenses and other liabilities — Unfunded commitments | 107,583,000 |  | 107,583,000 |  | 113,515,000
Amortization expense of tax credit and other investments | 12,286,000 | $ 16,833,000 | 54,370,000 | $ 58,477,000 |
Unrealized gains recognized on equity securities with readily determinable fair values | 55,000 | 188,000 | 813,000 | 955,000 |
Adjustments to equity securities without readily determinable fair values | 0 | 0 | 0 | 0 |
AFS debt securities, Fair Value | 4,539,160,000 |  | 4,539,160,000 |  | 3,317,214,000
Investment in tax credit and other investments |  |  |  |  |
Investments in Tax Credit and Other Investments, Net [Line Items] |  |  |  |  |
OTTI charges | 0 | $ 1,700,000 | 474,000 | 11,600,000 |
DC Solar |  |  |  |  |
Investments in Tax Credit and Other Investments, Net [Line Items] |  |  |  |  |
OTTI charges |  |  |  | $ 7,000,000.0 |
Collateralized loan obligations (“CLOs”) |  |  |  |  |
Investments in Tax Credit and Other Investments, Net [Line Items] |  |  |  |  |
AFS debt securities, Fair Value | 283,422,000 |  | 283,422,000 |  | 284,706,000
Tax credit investments |  |  |  |  |
Investments in Tax Credit and Other Investments, Net [Line Items] |  |  |  |  |
Equity securities with readily determinable fair values | 31,300,000 |  | 31,300,000 |  | 31,700,000
Other Assets [Member] |  |  |  |  |
Investments in Tax Credit and Other Investments, Net [Line Items] |  |  |  |  |
Equity securities without readily determinable fair values | $ 18,800,000 |  | $ 18,800,000 |  | $ 19,100,000

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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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- Definition Amortization of investments in projects that qualify for Community Reinvestment Act ("CRA") and other tax credits, included as a component of noninterest expense. + References No definition available. + Details
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