Business Developments - Narrative (Details) $ in Thousands				3 Months Ended			6 Months Ended
	Jun. 30, 2025 USD ($)	Feb. 12, 2024 USD ($) loan	Jan. 24, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jul. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Business Combination [Line Items]
Goodwill	$ 2,868,068			$ 2,868,068			$ 2,868,068			$ 2,868,068	$ 2,631,465
Professional and outside services				18,394	$ 14,066		35,620	$ 27,047
Transfer of loans held for investment to loans held for sale							317,172	333,483
Provision for credit losses				$ 46,500	$ 59,000		124,000	$ 104,500
Commercial portfolio | Commercial non-mortgage
Business Combination [Line Items]
Transfer of loans held for investment to loans held for sale	$ 242,200
Provision for credit losses							$ 1,300
Subsequent Event | Commercial portfolio | Commercial non-mortgage
Business Combination [Line Items]
Derecognition of loans held for sale									$ 33,300
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Mortgage Servicing Portfolio
Business Combination [Line Items]
Individual residential mortgage loans | loan		9,184
Aggregate UPB		$ 1,400,000
Cash proceeds from sale of business		18,400
Mortgage servicing rights		6,700
Gain recognized on sale		$ 11,700
Ametros
Business Combination [Line Items]
Goodwill			$ 228,185
Professional and outside services						$ 3,100
Ametros | Core deposits
Business Combination [Line Items]
Recognized identifiable assets acquired			$ 182,800
Acquired intangible assets, useful life			25 years
Ametros | Trade name
Business Combination [Line Items]
Recognized identifiable assets acquired			$ 6,100
Acquired intangible assets, useful life			5 years