BUSINESS COMBINATIONS - Schedule of Estimated Acquisition-date Fair Values of the Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Mar. 01, 2025	Mar. 31, 2026	Dec. 31, 2025
Consideration paid
Goodwill		$ 382,363	$ 383,280
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	213,352
Total assets acquired	7,499,301
Liabilities assumed
Deposits	6,571,699
Short-term borrowings	11,148
Long-term borrowings	68,922
Junior subordinated debt owed to unconsolidated trusts	2,238
Other liabilities	84,907
Total liabilities assumed	6,738,914
Net assets acquired	760,387
Consideration paid
Cash	4
Total consideration paid	808,980
Goodwill	$ 48,593
Useful life	10 years
CrossFirst | Common
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