ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 3,073,376	$ 2,837,004	$ 2,966,451	$ 2,647,088
Reclassification for gains included in net income, net of tax	0	0	0	0
Current year changes, net of tax	(38,099)	(3,139)	(66,324)	(11,620)
Balance at end of period	3,119,070	2,900,770	3,119,070	2,900,770
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(12,635)	25,024	15,590	33,505
Balance at end of period	(50,734)	21,885	(50,734)	21,885
Unrealized Gain (Loss) on Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(12,635)	25,024	15,590	33,505
Reclassification for gains included in net income, net of tax	0	0	0	0
Current year changes, net of tax	(38,099)	(3,139)	(66,324)	(11,620)
Balance at end of period	$ (50,734)	$ 21,885	$ (50,734)	$ 21,885