Summary of Significant Accounting Policies (Details) $ in Thousands		12 Months Ended
	Jun. 01, 2023 USD ($) board_seat	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jan. 01, 2023 USD ($)	Dec. 31, 2020 USD ($)
Basis Of Presentation [Line Items]
Settlement of acquired debt		$ 31,109	$ 0	$ 0
Restricted cash		$ 69,700	$ 66,800
Loan agreement, repayment performance, reasonable period of time		6 months	6 months
Troubled debt restructurings, extension of the maturity, term			1 year
Short-term deferrals, term			12 months
Financing receivable, allowance for credit losses, period beyond a reasonable forecast can be made		2 years
Financing receivable, allowance for credit losses, historical rates period		1 year
Number of reportable segments | segment		4
LIHTC tax credits and other tax benefits		$ 81,600	$ 37,500	27,800
LIHTC amortization expense		$ 63,900	30,300	20,600
Award requisite service period		3 years
Cumulative effect adjustment of Stockholders' equity at adoption		$ (5,144,148)	(4,475,801)	(5,296,800)		$ (5,161,334)
Retained Earnings
Basis Of Presentation [Line Items]
Cumulative effect adjustment of Stockholders' equity at adoption		$ (2,517,226)	(2,234,770)	$ (1,709,980)		$ (1,178,019)
Cumulative Effect, Period of Adoption, Adjustment
Basis Of Presentation [Line Items]
Cumulative effect adjustment of Stockholders' equity at adoption			297
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
Basis Of Presentation [Line Items]
Cumulative effect adjustment of Stockholders' equity at adoption			297		$ 297
CDI
Basis Of Presentation [Line Items]
Finite-lived intangible asset, useful life		10 years
Other non-interest expense
Basis Of Presentation [Line Items]
Fair value adjustment on derivative		$ 3,900	$ 6,000
Minimum
Basis Of Presentation [Line Items]
Other intangible assets, useful life		5 years
Minimum | Buildings and improvements
Basis Of Presentation [Line Items]
Premises and equipment, useful life		10 years
Minimum | Furniture, equipment and software
Basis Of Presentation [Line Items]
Premises and equipment, useful life		3 years
Minimum | Software and Software Development Costs
Basis Of Presentation [Line Items]
Premises and equipment, useful life		3 years
Maximum
Basis Of Presentation [Line Items]
Other intangible assets, useful life		10 years
Maximum | Buildings and improvements
Basis Of Presentation [Line Items]
Premises and equipment, useful life		40 years
Maximum | Furniture, equipment and software
Basis Of Presentation [Line Items]
Premises and equipment, useful life		10 years
Maximum | Software and Software Development Costs
Basis Of Presentation [Line Items]
Premises and equipment, useful life		7 years
Qualpay
Basis Of Presentation [Line Items]
Percentage of business acquired	60.00%
Number of seats on the Board of Directors acquired | board_seat	3
Total number of seats on the Board of Directors of the acquiree | board_seat	5
Cash paid	$ 7,000
Settlement of acquired debt	$ 31,100
Qualpay | Minimum
Basis Of Presentation [Line Items]
Other intangible assets, useful life		5 years
Qualpay | Maximum
Basis Of Presentation [Line Items]
Other intangible assets, useful life		8 years