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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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