MERGER - Pro Forma (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
MERGER
Net interest income	$ 365,075	$ 338,310	$ 294,842
Non-interest income	43,419	40,976	37,555
Net income	132,536	84,257	85,660
Net income available to common shareholders	$ 124,323	$ 78,453	$ 84,380
Earnings per share:
Basic	$ 3.20	$ 1.91	$ 2.05
Diluted	$ 3.20	$ 1.90	$ 2.05