Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
NET EARNINGS	$ 58,928	$ 52,857	$ 172,225	$ 143,558
OTHER ITEMS OF COMPREHENSIVE EARNINGS:
Change in unrealized gain on investment securities available-for-sale, before income taxes	(34,224)	1,083	(76,335)	110,644
Reclassification adjustment for realized gains on investment securities included in net earnings, before income taxes	(1)	(36)	(814)	(3,610)
Total other items of comprehensive earnings	(34,225)	1,047	(77,149)	107,034
Income tax benefit (expense) related to:
Change in unrealized gain on investment securities available-for-sale	7,186	(227)	16,029	(23,235)
Reclassification adjustment for realized gains on investment securities included in net earnings	0	7	172	758
Total income tax benefit (expense)	7,186	(220)	16,201	(22,477)
COMPREHENSIVE EARNINGS	$ 31,889	$ 53,684	$ 111,277	$ 228,115