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Acquisition Activities (Details) $ / shares in Units, $ in Thousands				3 Months Ended	9 Months Ended		12 Months Ended
	Apr. 03, 2023 USD ($)	Oct. 01, 2022 USD ($) item shares	Sep. 01, 2022 USD ($) item shares	Sep. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($) $ / shares	Dec. 31, 2022 USD ($)	Aug. 31, 2022 $ / shares
Acquisition Activities
Provision for credit loss expense					$ 3,725	$ 12,386
Cambr
Acquisition Activities
Cash consideration	$ 46,524
Transaction value	46,524
Acquisition related expenses				$ 100	$ 1,000
Acquired through acquisition	18,000
Cambr | Core deposit intangible
Acquisition Activities
Acquired through acquisition	$ 1,700,000
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							5,400
Acquired through acquisition			$ 52,900
Rock Canyon Bank | Core deposit intangible
Acquisition Activities
Acquired through acquisition			$ 13,300
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							$ 16,300
Acquired through acquisition		$ 111,300
Bank of Jackson Hole | Core deposit intangible
Acquisition Activities
Acquired through acquisition		$ 29,400

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Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

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

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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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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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