Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 271,156	$ 254,904	$ 238,167
OTHER COMPREHENSIVE INCOME (LOSS)
Unrealized holding gains (losses) arising during the period on available-for-sale securities	(91,226)	107,382	76,109
Unrealized holding gain on the transfer of held-to-maturity securities to available-for-sale per ASU 2017-12	0	0	2,547
Less: Reclassification adjustment for realized gains included in net income	15,498	54,806	13,314
Less: Realized loss on available-for-sale securities interest rate hedges	(10,588)	0	0
Net unrealized gains on securities transferred from available-for-sale to held-to-maturity during the period	1,106	0	0
Less: Amortization of net unrealized gains on securities transferred from available-for-sale to held-to-maturity	(104)	0	0
Other comprehensive income (loss), before tax effect	(95,134)	52,576	65,342
Less: Tax effect of other comprehensive income (loss)	(24,863)	13,741	17,077
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)	(70,271)	38,835	48,265
COMPREHENSIVE INCOME	$ 200,885	$ 293,739	$ 286,432