Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net income	$ 68,779	$ 72,163
Other comprehensive income (loss), before tax:
Change in net unrealized gain/loss on securities available for sale during the period	122,218	34,527
Change in net unrealized gain on securities transferred to held to maturity	(8,166)	(7,887)
Reclassification adjustment for net (gains) losses included in net income	(14,903)	(228)
Total securities available for sale and transferred securities, before tax amount	99,149	26,412
Defined-benefit post-retirement benefit plans:
Change in the net actuarial gain/loss	1,553	1,749
Total other comprehensive income (loss), before tax	100,702	28,161
Deferred tax expense (benefit) related to other comprehensive income	35,246	9,856
Other comprehensive income (loss), net of tax	65,456	18,305
Comprehensive income	$ 134,235	$ 90,468