Consolidated Statement of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Net earnings	$ 73,079	$ 70,999	$ 25,080
Unrealized holding gains on securities available-for-sale	7,363	9,523	22,291
Income tax expense related to unrealized holding gains arising during the period	(3,105)	(3,964)	(9,363)
Unrealized holding gains on securities available-for-sale, net of tax	4,258	5,559	12,928
Reclassification adjustment for gains included in net earnings (1)	(3,275)	0	(4,752)
Income tax expense related to reclassification adjustment	1,381	0	1,996
Reclassification adjustment for gains included in net earnings, net of tax	(1,894)	0	(2,756)
Other comprehensive income, net of tax	2,364	5,559	10,172
Comprehensive income	$ 75,443	$ 76,558	$ 35,252