Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 58,802	$ 55,924	$ 136,038	$ 103,619
OTHER COMPREHENSIVE INCOME
Unrealized holding gains arising during the period on available-for-sale securities	22,159	31,681	77,728	60,811
Unrealized holding gain on the transfer of held-to-maturity securities to available-for-sale per ASU 2017-12	0	0	0	2,547
Less: Reclassification adjustment for realized gains included in net income	390	2,823	32,485	5,563
Other comprehensive income, before tax effect	21,769	28,858	45,243	57,795
Less: Tax effect of other comprehensive income	5,689	7,542	11,824	15,105
TOTAL OTHER COMPREHENSIVE INCOME	16,080	21,316	33,419	42,690
COMPREHENSIVE INCOME	$ 74,882	$ 77,240	$ 169,457	$ 146,309