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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 |
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Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) loan | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) loan | Dec. 31, 2021 USD ($)
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract] |  |  |  |  |
Investments in tax credit and other investments, net | $ 314,820,000 |  | $ 314,820,000 |  | $ 338,522,000
Accrued expenses and other liabilities — Unfunded commitments | 144,272,000 |  | 144,272,000 |  | 163,464,000
Amortization expense of tax credit and other investments | 14,979,000 | $ 27,291,000 | 28,879,000 | $ 52,649,000 |
Unrealized gains (losses) recognized on equity securities with readily determinable fair values | (783,000) | 69,000 | (1,900,000) | (428,000) |
Adjustments to equity securities without readily determinable fair values | 0 | 0 | 0 | 0 |
Pre-tax recoveries | 0 |  | 0 |  |
Investment in tax credit and other investments |  |  |  |  |
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract] |  |  |  |  |
Impairment Charges | 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 |  | $ 877,000 |  | $ 1,300,000 |
Number of energy tax credits | loan |  | 2 |  | 2 |
Number of historic tax credits | loan |  |  |  | 1 |
Tax credit investments |  |  |  |  |
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract] |  |  |  |  |
Equity securities with readily determinable fair values | 24,800,000 |  | 24,800,000 |  | 26,600,000
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 | $ 35,000,000 |  | $ 35,000,000 |  | $ 33,100,000

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