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Merger with Pioneer Bancshares, Inc. - Estimated Fair Values of the Assets Acquired and Liabilities Assumed in this Transaction (Details) - USD ($) $ in Thousands | Apr. 01, 2022 | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 93,483 | $ 93,483
FirstSun Capital Bancorp and Pioneer Bancshares, Inc. Merger |  |  |
Business Acquisition [Line Items] |  |  |
Cash and cash equivalents | $ 449,278 |  |
Investment securities | 157,859 |  |
Loans held-for-sale | 2,923 |  |
Loans | 811,300 |  |
Premises and equipment | 39,935 |  |
Bank-owned life insurance | 21,382 |  |
Restricted equity securities | 9,320 |  |
Core deposits and other intangible assets | 11,771 |  |
Accrued interest receivable | 3,947 |  |
Deferred tax assets | 19,752 |  |
Prepaid expenses and other assets | 7,317 |  |
Total assets acquired | 1,534,784 |  |
Deposits | 1,192,081 |  |
Federal Home Loan Bank advances | 159,924 |  |
Accrued interest payable | 407 |  |
Accrued expenses and other liabilities | 1,975 |  |
Total liabilities assumed | 1,354,387 |  |
Fair value of net assets acquired | 180,397 |  |
Purchase price | 240,830 |  |
Goodwill | $ 60,433 |  |

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