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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, 2021 USD ($) credit | Jun. 30, 2020 USD ($) credit | Jun. 30, 2021 USD ($) credit | Jun. 30, 2020 USD ($) credit | Dec. 31, 2020 USD ($)
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract] |  |  |  |  |
Investments in tax credit and other investments, net | $ 364,187,000 |  | $ 364,187,000 |  | $ 266,525,000
Accrued expenses and other liabilities — Unfunded commitments | 195,631,000 |  | 195,631,000 |  | 105,282,000
Amortization expense of tax credit and other investments | 27,291,000 | $ 21,829,000 | 52,649,000 | $ 40,611,000 |
Unrealized gains (losses) recognized on equity securities with readily determinable fair values | 69,000 | 720,000 | (428,000) | 758,000 |
Adjustments to equity securities without readily determinable fair values | 0 | 0 | 0 | 0 |
Investment in tax credit and other investments |  |  |  |  |
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract] |  |  |  |  |
Pre-tax recoveries |  | $ 109,000 |  |  |
OTTI charges | 0 |  | 0 |  |
Investment in Tax Credit and Other Investments, Single Credit |  |  |  |  |
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract] |  |  |  |  |
Pre-tax recoveries |  |  | $ 1,300,000 |  |
Number of historic tax credits | credit |  | 1 | 1 |  |
Investment in Tax Credit and Other Investments, Multiple Credit |  |  |  |  |
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract] |  |  |  |  |
Pre-tax recoveries | $ 877,000 |  |  | $ 259,000 |
Number of energy tax credits | credit | 2 |  | 2 |  |
Number of historic tax credits | credit |  |  |  | 2 |
Investment in Tax Credit and Other Investments, OTTI, Single Credit |  |  |  |  |
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract] |  |  |  |  |
OTTI charges |  | $ 733,000 |  | $ 733,000 |
Number of historic tax credits | credit |  | 1 |  | 1 |
Number of CRA investment | credit |  | 1 |  | 1 |
Tax credit investments |  |  |  |  |
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract] |  |  |  |  |
Equity securities with readily determinable fair values | $ 26,800,000 |  | $ 26,800,000 |  | 31,300,000
Investments in Tax Credit and Other Investments and Other Assets |  |  |  |  |
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract] |  |  |  |  |
Equity securities without readily determinable fair values | $ 29,300,000 |  | $ 29,300,000 |  | $ 23,700,000

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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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