ACQUISITIONS - Pro Forma Financial Information (Details) - First Savings - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Business Combination [Line Items]
Total revenue (net interest income plus noninterest income)	$ 164,847	$ 757,511
Net income	42,492	253,686
Net income available to common stockholders	$ 42,023	$ 251,811
Earnings per common share:
Basic (in dollars per share)	$ 0.67	$ 3.96
Diluted (in dollars per share)	$ 0.66	$ 3.94