Mergers and Acquisitions - Summary of Purchase Price Allocation (Details) - USD ($) $ in Thousands	Jan. 24, 2024	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Goodwill		$ 2,868,068	$ 2,631,465	$ 2,514,104
Ametros
Business Acquisition [Line Items]
Total consideration	$ 378,424
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	310
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets, Net	(35,889)
Premises and equipment	1,078
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	188,900
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	291,768
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	446,167
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Business Combination, Recognized Identifiable Liabilities Assumed, Interest Bearing Deposit Liabilities	(20,622)
Accrued expenses and other liabilities	314,350
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	293,728
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	152,439
Goodwill	228,185
Cash consideration	359,700
Debt Instrument, Decrease, Forgiveness	12,900
Business Combination, Separately Recognized Transactions, Liabilities Recognized	5,800
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Funds Held In Escrow	288,167
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables	2,435
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	1,166
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable	684
Business Combinations, Recognized Identifiable Assets Acquired And Liabilities Assumed, Accrued Expenses	4,270
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue	20,391
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Members Funds	288,167
Business Combinations, Recognized Identifiable Assets Acquired And Liabilities Assumed, Operating Lease Liabilities	838
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Pre Existing Equity Interest	2,200
Business Combination, Amount Held In Operating Cash Account	$ 20,600
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage	0.60%
Equity interests acquired	99.40%
Business Combination, Gain (Loss) In Other Income	$ 1,500