Condensed Financial Information (Parent Company Only) - Condensed Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Provision for income taxes	$ 64,890	$ 64,265	$ 50,358
NET INCOME	254,904	238,167	215,713
Preferred stock dividends	52	339	0
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	254,852	237,828	215,713
Parent Company
Income Statement [Abstract]
Dividends from subsidiaries	311,253	67,893	145,980
Other income	762	13,658	658
Income	312,015	81,551	146,638
EXPENSE	37,204	40,594	32,714
Income before income taxes and equity in undistributed net income of subsidiaries	274,811	40,957	113,924
Provision for income taxes	(9,438)	(5,680)	(10,732)
Income before equity in undistributed net income of subsidiaries	284,249	46,637	124,656
Equity in undistributed net income of subsidiaries	(29,345)	191,530	91,057
NET INCOME	254,904	238,167	215,713
Preferred stock dividends	52	339	0
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 254,852	$ 237,828	$ 215,713