Condensed Financial Information (Parent Company Only) - Condensed Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
NET INCOME	$ 254,904	$ 238,167	$ 215,713
OTHER COMPREHENSIVE INCOME (LOSS)
COMPREHENSIVE INCOME	293,739	286,432	205,603
Parent Company
NET INCOME	254,904	238,167	215,713
OTHER COMPREHENSIVE INCOME (LOSS)
Equity in other comprehensive income (loss) of subsidiaries	38,835	48,265	(10,110)
COMPREHENSIVE INCOME	$ 293,739	$ 286,432	$ 205,603