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Acquisition Activities - Accounting for acquired loans (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
	Oct. 01, 2022	Sep. 01, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Acquisition Activities
Loans acquired accounted as PCD		$ 13,145
Charge-offs			$ 354	$ 451	$ 679	$ 1,085
Loans previously charged-off		2,054
Rock Canyon Bank
Acquisition Activities
Loans, net		535,197
Loans previously charged-off		2,100
Rock Canyon Bank | Receivables Acquired with Deteriorated Credit Quality [Member]
Acquisition Activities
Loans, net		537,700
Loans acquired accounted as PCD		$ 11,100
Loans acquired accounted as PCD percentage		2.10%
Gross contractual amounts receivable		$ 13,800
Loans not expected to be collected		$ 4,500
Bank of Jackson Hole
Acquisition Activities
Loans, net	$ 1,185,699
Loans acquired accounted as PCD	13,902
Bank of Jackson Hole | Receivables Acquired with Deteriorated Credit Quality [Member]
Acquisition Activities
Loans, net	1,200
Loans acquired accounted as PCD	$ 13,900
Loans acquired accounted as PCD percentage	1.10%
Gross contractual amounts receivable	$ 14,000
Charge-offs	500
Loans not expected to be collected	$ 3,800

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Percentage of loans acquired in business combination accounted as PCD

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Amount of loans previously charged-off attributable to other factors on financing receivable purchased with credit deterioration.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
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For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the best estimate at the acquisition date of the contractual cash flows not expected to be collected, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

+ References

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For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

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Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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Amount at par value of financing receivable purchased with credit deterioration.

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