ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 2,966,451	$ 2,647,088
Current year changes, net of tax	(17,431)	(7,415)
Balance at end of period	3,007,159	2,757,596
Unrealized Gain (Loss) on Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	15,590	33,505
Current year changes, net of tax	(17,431)	(7,415)
Balance at end of period	(1,841)	26,090
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	15,590	33,505
Balance at end of period	$ (1,841)	$ 26,090