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Merger with Pioneer Bancshares, Inc. - Narrative (Details) - FirstSun Capital Bancorp and Pioneer Bancshares, Inc. Merger $ in Thousands | Apr. 01, 2022 USD ($) shares
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Business Acquisition [Line Items] |
Business acquisition, shares issuable in merger (in shares) | shares | 1.0443
Business acquisition, number of shares issued (in shares) | shares | 6,467,466
Business acquisition, equity interest issued | $ 230,760
Business acquisition, consideration transferred, stock options converted, number of shares (in shares) | shares | 431,645
Business acquisition, consideration transferred, stock options converted | $ 5,334
Payments to acquire businesses | 4,736
Business acquisition, aggregate consideration | $ 240,830

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