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
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract]
Investments in tax credit and other investments, net	$ 318,562,000		$ 338,522,000
Accrued expenses and other liabilities — Unfunded commitments	140,070,000		163,464,000
Amortization expense of tax credit and other investments	13,900,000	$ 25,358,000
Unrealized gains (losses) recognized on equity securities with readily determinable fair values	(1,200,000)	(497,000)
Adjustments to equity securities without readily determinable fair values	0	0
Pre-tax recoveries	0	374,000
Investment in tax credit and other investments
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract]
Impairment recoveries	0	$ 0
Tax credit investments
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract]
Equity securities with readily determinable fair values	25,500,000		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	$ 33,000,000		$ 33,100,000