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MERGERS AND ACQUISITIONS - Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 7 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 01, 2025 USD ($) state $ / shares shares | Feb. 28, 2025 USD ($) | Apr. 01, 2024 USD ($) $ / shares shares | Mar. 31, 2025 bankingCenter | Jun. 30, 2025 USD ($) | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
Business Combination, Contingent Consideration [Line Items] |  |  |  |  |  |  |
Number of full-service locations | bankingCenter |  |  |  | 79 |  |  |
Number of states in which entity operates | state | 10 |  |  |  |  |  |
Preferred stock redemption price per share (in dollars per share) | $ / shares | $ 1,000 |  |  |  |  |  |
Fair value adjustments |  |  |  |  |  | $ (1,800) |
Goodwill |  |  |  |  |  | $ 383,323 | $ 333,695
CrossFirst |  |  |  |  |  |  |
Business Combination, Contingent Consideration [Line Items] |  |  |  |  |  |  |
Total consideration paid | $ 808,980 | $ 6,000 |  |  |  |  |
Goodwill | 49,553 |  |  |  |  |  |
Fair value of financial assets acquired | 4,700,000 |  |  |  |  |  |
Gross contractual amounts of acquired receivables | $ 4,790,000 |  |  |  |  |  |
CrossFirst | Common | CrossFirst | SSARs |  |  |  |  |  |  |
Business Combination, Contingent Consideration [Line Items] |  |  |  |  |  |  |
Shares received for each share owned (in shares) | shares | 0.6675 |  |  |  |  |  |
M&M |  |  |  |  |  |  |
Business Combination, Contingent Consideration [Line Items] |  |  |  |  |  |  |
Shares received for each share owned (in shares) | shares |  |  | 5.7294 |  |  |  |
Total consideration paid |  |  | $ 49,575 |  |  |  |
Goodwill |  |  | $ 15,897 |  |  |  |
Per share cash consideration entitled, Cash Election (in dollars per share) | $ / shares |  |  | $ 117.74 |  |  |  |
Consideration transferred per share in cash, Mixed Election (in dollars per share) | $ / shares |  |  | $ 34.55 |  |  |  |
Mixed consideration (in shares) | shares |  |  | 4.0481 |  |  |  |
Business combination consideration, number of shares (in shares) | shares |  |  | 1,429,304 |  |  |  |
Cash |  |  | $ 12,200 |  |  |  |
Consideration transferred per share in cash, Share Election (in dollars per share) | $ / shares |  |  | $ 5.3966 |  |  |  |
Consideration transferred per share in shares, Share Election (in shares) | shares |  |  | 5.4668 |  |  |  |
Cash consideration received (in dollars per share) | $ / shares |  |  | $ 117.74 |  |  |  |
Fractional shares, payment rate (in dollars per share) | $ / shares |  |  | $ 23.32 |  |  |  |
Additional consideration transferred |  |  | $ 3,000 |  |  |  |
Number of shares redeemed ( in shares) | shares |  |  | 300 |  |  |  |
Business acquisition fair value adjustment, deferred taxes |  |  |  |  | $ 100 |  |

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