MERGERS AND ACQUISITIONS - Schedule of Estimated Acquisition-date Fair Values of the Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Mar. 01, 2025	Feb. 28, 2025	Apr. 01, 2024	Mar. 31, 2025	Dec. 31, 2024
Consideration paid
Goodwill				$ 385,139	$ 333,695
CrossFirst
Assets acquired
Cash and cash equivalents	$ 385,808
Securities	725,622
Portfolio loans, net of ACL	6,022,347
Premises and equipment	64,249
Right of use assets	30,723
Other intangible assets	81,783
Other assets	186,994
Total assets acquired	7,497,526
Liabilities assumed
Deposits	6,571,699
Short-term borrowings	11,209
Long-term debt	61,780
Subordinated notes, net of unamortized issuance costs	0
Junior subordinated debt owed to unconsolidated trusts	2,238
Lease liabilities	30,723
Other liabilities	62,266
Total liabilities assumed	6,739,915
Net assets acquired	757,611
Consideration paid
Cash	4
Total consideration paid	808,980	$ 6,000
Goodwill	51,369
CrossFirst | Common stock
Consideration paid
Common stock	795,227
CrossFirst | Preferred stock
Consideration paid
Common stock	7,750
CrossFirst | Replacement awards
Consideration paid
Common stock	$ 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
Right of use assets			253
Other intangible assets			6,346
Other assets			10,208
Total assets acquired			477,745
Liabilities assumed
Deposits			392,838
Short-term borrowings			35,932
Long-term debt			1,450
Subordinated notes, net of unamortized issuance costs			3,911
Junior subordinated debt owed to unconsolidated trusts			2,594
Lease liabilities			253
Other liabilities			7,089
Total liabilities assumed			444,067
Net assets acquired			33,678
Consideration paid
Cash			15,200
Total consideration paid			49,575
Goodwill			15,897
M&M | Common stock
Consideration paid
Common stock			34,375
M&M | Preferred stock
Consideration paid
Common stock			0
M&M | Replacement awards
Consideration paid
Common stock			$ 0