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MERGERS AND ACQUISITIONS - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 26, 2024 | Apr. 01, 2024 | Sep. 30, 2024 | Sep. 30, 2024 | Dec. 31, 2023
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |
Goodwill |  |  | $ 333,498 | $ 333,498 | $ 317,873
CrossFirst Bankshares, Inc. |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |
Business acquisition stock holders own percentage | 63.50% |  |  |  |
Pre-tax acquisition expenses |  |  | 1,300 | 1,500 |
CrossFirst Bankshares, Inc. | CrossFirst Bankshares, Inc. |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |
Business acquisition stock holders own percentage on fully-diluted basis | 0.365 |  |  |  |
CrossFirst Bankshares, Inc. | Common Stock | CrossFirst Bankshares, Inc. |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |
Shares received for each share owned (in shares) | 0.6675 |  |  |  |
Merchants and Manufacturers Bank Corporation |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |
Shares received for each share owned (in shares) |  | 5.7294 |  |  |
Pre-tax acquisition expenses |  |  | $ 600 | $ 2,900 |
Per share cash consideration entitled, Cash Election (in dollars per share) |  | $ 117.74 |  |  |
Consideration transferred per share in cash, Mixed Election (in dollars per share) |  | $ 34.55 |  |  |
Consideration transferred per share in shares, Mixed Election (in shares) |  | 4.0481 |  |  |
Business combination consideration, number of shares (in shares) |  | 1,429,304 |  |  |
Cash |  | $ 12,200 |  |  |
Consideration transferred per share in cash, Share Election (in dollars per share) |  | $ 5.3966 |  |  |
Consideration transferred per share in shares, Share Election (in shares) |  | 5.4668 |  |  |
Cash consideration received (in dollars per share) |  | $ 117.74 |  |  |
Fractional shares, payment rate (in dollars per share) |  | $ 23.32 |  |  |
Additional consideration transferred |  | $ 3,000 |  |  |
Number of shares redeemed ( in shares) |  | 300 |  |  |
Goodwill |  | $ 15,625 |  |  |

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