ACQUISITIONS - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Feb. 01, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Business Combination [Line Items]
Goodwill	$ 782,789		$ 712,002	$ 712,002	$ 712,002
First Savings
Business Combination [Line Items]
Cash and due from banks		$ 54,073
Investment securities		251,341
Loans held for sale		62,537
Loans		1,845,921
Allowance for credit losses - loans		(22,280)
Premises and equipment		23,465
Federal Home Loan Bank stock		23,630
Other real estate owned		856
Interest receivable		11,002
Cash surrender value of life insurance		63,626
Tax asset, deferred and receivable		22,862
Other assets		26,488
Deposits		(1,690,130)
Federal Home Loan Bank advances		(482,729)
Subordinated debentures		(28,712)
Interest payable		(5,930)
Other liabilities		(13,766)
Net tangible assets acquired		142,254
Other intangibles		30,180
Goodwill		70,787
Purchase price		$ 243,221