Consolidated Statements of Comprehensive Earnings (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
NET EARNINGS	$ 29,374	$ 25,603	$ 84,227	$ 78,108
OTHER ITEMS OF COMPREHENSIVE EARNINGS (LOSS):
Change in unrealized gain on investment securities available-for-sale, before income taxes	1,729	(18,984)	28,682	27,235
Reclassification adjustment for realized gains on investment securities included in net earnings, before income tax	(1,075)	(239)	(1,825)	(1,153)
Total other items of comprehensive earnings	654	(19,223)	26,857	26,082
Income tax benefit (expense) related to other items of comprehensive earnings	(229)	6,728	(9,400)	(9,129)
COMPREHENSIVE EARNINGS	$ 29,799	$ 13,108	$ 101,684	$ 95,061