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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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