Mergers and Acquisitions - Narrative (Details) $ in Thousands					12 Months Ended
	Nov. 07, 2022 USD ($)	Feb. 18, 2022 USD ($)	Jan. 31, 2022 USD ($) shares	Apr. 19, 2021	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jan. 11, 2023 USD ($)	Oct. 30, 2020 USD ($)	Dec. 16, 2019 USD ($)
Business Acquisition [Line Items]
Preferred stock, convertible | shares			1
Goodwill					$ 2,514,104	$ 538,373	$ 538,373
Provision (benefit) for credit losses					$ 280,619	$ (54,500)	$ 137,750
Series A Preferred Stock
Business Acquisition [Line Items]
Preferred stock, dividend rate (as a percent)			6.50%
Preferred Stock Series G Issued
Business Acquisition [Line Items]
Preferred stock, dividend rate (as a percent)					6.50%
Sterling
Business Acquisition [Line Items]
Share exchange ratio				0.4630
Goodwill			$ 1,939,765
Provision (benefit) for credit losses					$ 175,100
Aggregate principal amount			$ 3,240,535						$ 225,000	$ 274,000
Sterling | Core Deposits
Business Acquisition [Line Items]
Acquired intangible assets, useful life			10 years
Sterling | Customer Relationships
Business Acquisition [Line Items]
Acquired intangible assets, useful life			10 years
Bend Financial, Inc.
Business Acquisition [Line Items]
Equity interests acquired		100.00%
Cash consideration		$ 55,300
Aggregate principal amount		19,300
Bend Financial, Inc. | Internal use software
Business Acquisition [Line Items]
Intangible assets acquired		15,900
Bend Financial, Inc. | Customer Relationships
Business Acquisition [Line Items]
Intangible assets acquired		$ 3,000
Inland Bank and Trust HSA Portfolio Acquisition
Business Acquisition [Line Items]
Cash and deposits received from acquisition	$ 15,600
Deposit premium based on final settlement	2.00%
Core deposit intangible asset	$ 300
InterLINK Acquisition | Subsequent Event
Business Acquisition [Line Items]
Core deposit intangible asset								$ 9,000,000