Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net income		$ 46,415	$ 40,769	$ 128,134	$ 97,100
Unrealized gain from securities:
Net unrealized holding loss from available for sale securities arising during the period		(14,149)	549	(48,043)	8,284
Reclassification adjustment of net gain from sale of available for sale securities included in income				(81)	0
Net unrealized gain from securities, net of reclassification adjustment		(14,149)	549	(48,124)	8,284
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	46	183	178
Pension plan liability adjustment, net		61	46	183	4,782
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	[1]	(14,088)	595	(47,941)	13,066
Total comprehensive income		$ 32,327	$ 41,364	$ 80,193	$ 110,166

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