Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 238,167	$ 215,713	$ 92,940
OTHER COMPREHENSIVE INCOME (LOSS)
Unrealized holding gains (losses) arising during the period on available-for-sale securities	76,109	(13,626)	2,645
Unrealized holding gain on the transfer of held-to-maturity securities to available-for-sale per ASU 2017-12	2,547	0	0
Less: Reclassification adjustment for realized gains included in net income	13,314	61	1,059
Other comprehensive income (loss), before tax effect	65,342	(13,687)	1,586
Less: Tax effect of other comprehensive income (loss)	17,077	(3,577)	622
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)	48,265	(10,110)	964
COMPREHENSIVE INCOME	$ 286,432	$ 205,603	$ 93,904