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Acquisition Activities - Intangible Assets (Details) - USD ($) $ in Millions				9 Months Ended
	Apr. 03, 2023	Oct. 01, 2022	Sep. 01, 2022	Sep. 30, 2023
Acquisition Activities
Amortization period for intangible assets				9 years 9 months 18 days
Core deposit intangible
Acquisition Activities
Amortization period			10 years	10 years
Internally developed technology
Acquisition Activities
Amortization period				5 years
Cambr
Acquisition Activities
Acquired through acquisition	$ 18.0
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
Acquisition Activities
Acquired through acquisition			$ 52.9
Rock Canyon Bank | Core deposit intangible
Acquisition Activities
Acquired through acquisition			13.3
Rock Canyon Bank | Small Business Administration ("SBA") servicing rights
Acquisition Activities
Acquired through acquisition			$ 3.1
Bank of Jackson Hole
Acquisition Activities
Acquired through acquisition		$ 111.3
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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- Definition

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+ References

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+ References

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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482665/350-30-50-1

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 30
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-Section 50
-Paragraph 1
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