BUSINESS COMBINATIONS - Schedule of Estimated Acquisition-date Fair Values of the Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Mar. 01, 2025	Apr. 01, 2024	Dec. 31, 2025	Dec. 31, 2024
Consideration paid
Goodwill			$ 383,280	$ 333,695
CrossFirst
Assets acquired
Cash and cash equivalents	$ 385,808
Securities	725,622
Portfolio loans, net of ACL	6,023,063
Premises and equipment	69,673
Other intangible assets	81,783
Other assets	212,440
Total assets acquired	7,498,389
Liabilities assumed
Deposits	6,571,699
Short-term borrowings	11,148
Long-term borrowings	68,922
Subordinated notes, net of unamortized issuance costs	0
Junior subordinated debt owed to unconsolidated trusts	2,238
Other liabilities	84,912
Total liabilities assumed	6,738,919
Net assets acquired	759,470
Consideration paid
Cash	4
Total consideration paid	808,980
Goodwill	$ 49,510	$ 15,900
Useful life	10 years
CrossFirst | Common stock
Consideration paid
Common stock, Preferred stock and Replacement awards	$ 795,227
CrossFirst | Preferred stock
Consideration paid
Common stock, Preferred stock and Replacement awards	7,750
CrossFirst | Replacement awards
Consideration paid
Common stock, Preferred stock and Replacement awards	$ 5,999
M&M
Assets acquired
Cash and cash equivalents		33,577
Securities		8,086
Portfolio loans, net of ACL		417,230
Premises and equipment		2,045
Other intangible assets		6,346
Other assets		10,461
Total assets acquired		477,745
Liabilities assumed
Deposits		392,838
Short-term borrowings		35,932
Long-term borrowings		1,450
Subordinated notes, net of unamortized issuance costs		3,911
Junior subordinated debt owed to unconsolidated trusts		2,594
Other liabilities		7,342
Total liabilities assumed		444,067
Net assets acquired		33,678
Consideration paid
Cash		15,200
Total consideration paid		49,575
Goodwill		$ 15,897
Useful life		10 years
M&M | Common stock
Consideration paid
Common stock, Preferred stock and Replacement awards		$ 34,375
M&M | Preferred stock
Consideration paid
Common stock, Preferred stock and Replacement awards		0
M&M | Replacement awards
Consideration paid
Common stock, Preferred stock and Replacement awards		$ 0