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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 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 + Details
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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 No definition available. + Details
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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 -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-1 + Details
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