Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Net income		$ 39,970	$ 29,199
Unrealized gain from securities:
Net unrealized holding loss from available for sale securities arising during the period		(26,048)	1,702
Reclassification adjustment of net gain from sale of available for sale securities included in income		(78)	0
Net unrealized gain from securities, net of reclassification adjustment		(26,126)	1,702
Pension plan liability adjustment:
Unrecognized net actuarial gain (loss) during the period		0	4,604
Less: amortization of unrecognized net actuarial loss included in net periodic pension cost		61	87
Pension plan liability adjustment, net		61	4,691
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	[1]	(26,065)	6,393
Total comprehensive income		$ 13,905	$ 35,592

[1] All amounts are net of tax. Amounts in parenthesis indicate debits.