ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Summary of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ 2,647,088	$ 2,469,582	$ 1,456,347
Reclassification for gains included in net income, net of tax	0	0	(46)
Current year changes, net of tax	(17,915)	15,510	22,867
Balance at end of period	2,966,451	2,647,088	2,469,582
Accumulated Other Comprehensive Income (Loss), Net of Tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	33,505	17,995	(4,826)
Balance at end of period	15,590	33,505	17,995
Unrealized Gain (Loss) on Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	0	(147)	351
Reclassification for gains included in net income, net of tax			0
Current year changes, net of tax	0	147	(498)
Balance at end of period	0	0	(147)
Unrealized Gain (Loss) on Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	33,505	18,142	(5,177)
Reclassification for gains included in net income, net of tax			(46)
Current year changes, net of tax	(17,915)	15,363	23,365
Balance at end of period	$ 15,590	$ 33,505	$ 18,142