BUSINESS COMBINATIONS - Narrative (Details) $ / shares in Units, $ in Thousands			3 Months Ended	9 Months Ended	10 Months Ended
	Mar. 01, 2025 USD ($) $ / shares shares	Apr. 01, 2024 USD ($) $ / shares shares	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2025 USD ($) state
Business Combination, Contingent Consideration [Line Items]
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				$ (400)	$ 1,900
Goodwill				$ 333,695	$ 383,280
CrossFirst
Business Combination, Contingent Consideration [Line Items]
Goodwill	$ 49,510	$ 15,900
Fair value of financial assets acquired	4,700,000
Gross contractual amounts of acquired receivables	$ 4,790,000
M&M
Business Combination, Contingent Consideration [Line Items]
Shares received for each share owned (in shares) | shares		5.7294
Goodwill		$ 15,897
Per share cash consideration entitled (in dollars per share) | $ / shares		$ 117.74
Mixed consideration (in dollars per share) | $ / shares		$ 34.55
Mixed consideration ratio (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
Fair value adjustments			$ (100)
SSARs | CrossFirst | Common | CrossFirst
Business Combination, Contingent Consideration [Line Items]
Shares received for each share owned (in shares) | shares	0.6675