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Loans and Allowance for Credit Losses - Schedule of Purchased Credit Deteriorated Loans (Details) - USD ($) $ in Thousands			12 Months Ended
	May 01, 2025	Apr. 01, 2024	Dec. 31, 2025	Dec. 31, 2024
Financing Receivable, Allowance for Credit Losses [Line Items]
Purchase price of loans at acquisition		$ 610,700
Allowance for credit losses at acquisition		26,700
Par value of acquired loans at acquisition		$ 679,300
Bremer
Financing Receivable, Allowance for Credit Losses [Line Items]
Purchase price of loans at acquisition	$ 1,900,000		$ 1,876,226
Allowance for credit losses at acquisition	103,500		103,546
Non-credit discount at acquisition			75,826
Par value of acquired loans at acquisition	$ 2,100,000		2,055,598
CapStar Financial Holdings, Inc.
Financing Receivable, Allowance for Credit Losses [Line Items]
Purchase price of loans at acquisition			610,691
Allowance for credit losses at acquisition			26,725	$ 26,700
Non-credit discount at acquisition			41,886
Par value of acquired loans at acquisition			$ 679,302

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- Definition

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 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
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-Section 1405
-Paragraph c
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of discount (premium) attributable to other factors on financing receivable purchased with credit deterioration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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