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Acquisition Activities - Intangible Assets (Details) - USD ($) $ in Millions				12 Months Ended
	Apr. 03, 2023	Oct. 01, 2022	Sep. 01, 2022	Dec. 31, 2024
Acquisition Activities
Amortization period for intangible assets				9 years 9 months 18 days
Core deposit intangible
Acquisition Activities
Amortization period				10 years
Acquired technology intangible
Acquisition Activities
Amortization period				5 years
Cambr | Core deposit intangible
Acquisition Activities
Acquired through acquisition	$ 1,700.0
Cambr | Other intangible assets
Acquisition Activities
Acquired through acquisition	$ 18.0
Amortization period for intangible assets	9 years 4 months 24 days
Rock Canyon Bank | Core deposit intangible
Acquisition Activities
Acquired through acquisition			$ 13.3
Amortization period			10 years
Rock Canyon Bank | Small Business Administration ("SBA") servicing rights
Acquisition Activities
Acquired through acquisition			$ 3.1
Bank of Jackson Hole
Acquisition Activities
Amount transferred from available-for-sale securities to held-to-maturity		$ 75.3
Amortization period		10 years
Bank of Jackson Hole | Core deposit intangible
Acquisition Activities
Acquired through acquisition		$ 29.4
Bank of Jackson Hole | Wealth management intangibles
Acquisition Activities
Acquired through acquisition		$ 1.3

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