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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 | 12 Months Ended | 60 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) fund
Investments in Tax Credit and Other Investments, Net |  |  |  |  |  |
Investments in tax credit and other investments, net | $ 254,140,000 |  | $ 254,140,000 | $ 231,635,000 |  | $ 231,635,000
Accrued expenses and other liabilities — Unfunded commitments | 113,515,000 |  | 113,515,000 | 80,228,000 |  | 80,228,000
Amortization of tax credit and other investments |  |  | 85,515,000 | 89,628,000 | $ 87,950,000 |
Equity securities without readily determinable fair values at carrying value | 19,100,000 |  | 19,100,000 | 14,200,000 |  | 14,200,000
Price adjustment to equity securities |  |  | 0 | 0 |  |
Available-for-sale debt securities, Fair Value | 3,317,214,000 |  | 3,317,214,000 | 2,741,847,000 |  | 2,741,847,000
DC Solar Tax Credit Investments |  |  |  |  |  |
Investments in Tax Credit and Other Investments, Net |  |  |  |  |  |
Investments in tax credit and other investments, net |  |  |  | 7,000,000.0 |  | $ 7,000,000.0
Number of tax credit funds | fund |  |  |  |  |  | 4
Pre-tax impairment charge or recovery | 1,600,000 |  | 1,600,000 |  |  |
Expected Future Cash Flows |  | $ 0 |  |  |  |
Accrued Expenses And Other Liabilities, Unfunded Commitments | DC Solar Tax Credit Investments |  |  |  |  |  |
Investments in Tax Credit and Other Investments, Net |  |  |  |  |  |
Accrued expenses and other liabilities — Unfunded commitments | 0 |  | 0 | 0 |  | $ 0
Amortization of Tax Credit And Other Investments |  |  |  |  |  |
Investments in Tax Credit and Other Investments, Net |  |  |  |  |  |
Pre-tax impairment charge |  |  | 14,600,000 |  |  |
Pre-tax impairment charge or recovery |  |  |  | $ 0 |  |
Amortization of Tax Credit And Other Investments | DC Solar Tax Credit Investments |  |  |  |  |  |
Investments in Tax Credit and Other Investments, Net |  |  |  |  |  |
Pre-tax impairment charge |  | $ 7,000,000.0 |  |  |  |
Collateralized loan obligations (“CLOs”) |  |  |  |  |  |
Investments in Tax Credit and Other Investments, Net |  |  |  |  |  |
Available-for-sale debt securities, Fair Value | $ 284,706,000 |  | $ 284,706,000 |  |  |

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