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Acquisition Activities (Details) $ / shares in Units, $ in Thousands			3 Months Ended		12 Months Ended
	Oct. 01, 2022 USD ($) item shares	Sep. 01, 2022 USD ($) item shares	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2022 $ / shares	Aug. 31, 2022 $ / shares
Acquisition Activities
Provision for credit loss expense (release)			$ 900	$ (322)
Rock Canyon Bank
Acquisition Activities
Cash consideration		$ 16,141
Shares issued | shares		3,096,745
Transaction value		$ 140,413
Closing price | $ / shares							$ 40.13
Number of banking centers added | item		7
Acquisition related expenses					$ 12,300
Provision for credit loss expense (release)					5,400
Bank of Jackson Hole
Acquisition Activities
Cash consideration	$ 50,989
Shares issued | shares	4,391,964
Transaction value	$ 213,448
Closing price | $ / shares						$ 36.99
Number of banking centers added | item	12
Acquisition related expenses					24,500
Provision for credit loss expense (release)					$ 16,300

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Number of banking centers added from acquisition.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Number of shares of stock issued during the period pursuant to acquisitions.

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