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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 |
--- | --- | ---
Mar. 31, 2020 USD ($) credit | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($)
Investments in Tax Credit and Other Investments, Net [Line Items] |  |  |
Investments in tax credit and other investments, net | $ 268,330,000 |  | $ 254,140,000
Accrued expenses and other liabilities — Unfunded commitments | 121,604,000 |  | 113,515,000
Amortization expense of tax credit and other investments | 17,325,000 | $ 24,905,000 |
Unrealized gains recognized on marketable equity securities held | 38,000 | 392,000 |
Equity securities without readily determinable fair values | 19,100,000 |  | 19,100,000
Adjustments to equity securities without readily determinable fair values | 0 | 0 |
Tax Credit Investments, Pre-tax Impairment Recovery | $ 150,000 | 0 |
Number of recovered historic tax credit investments | credit | 1 |  |
AFS debt securities | $ 3,695,943,000 |  | 3,317,214,000
Collateralized loan obligations (“CLOs”) |  |  |
Investments in Tax Credit and Other Investments, Net [Line Items] |  |  |
AFS debt securities | 259,878,000 |  | 284,706,000
Tax credit investments |  |  |
Investments in Tax Credit and Other Investments, Net [Line Items] |  |  |
Marketable equity securities | 30,300,000 |  | $ 31,700,000
Amortization of tax credit and other investments |  |  |
Investments in Tax Credit and Other Investments, Net [Line Items] |  |  |
No OTTI charge | $ 0 |  |
DC Solar Tax Credit Investments | Amortization of tax credit and other investments |  |  |
Investments in Tax Credit and Other Investments, Net [Line Items] |  |  |
No OTTI charge |  | $ 7,000,000.0 |

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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 [Line Items] for Investments in Tax Credit and Other Investments, Net [Table] + 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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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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