Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net income		$ 40,769	$ 27,484	$ 97,100	$ 74,148
Unrealized gain from securities:
Net unrealized holding loss from available for sale securities arising during the period		549	(4,049)	8,284	23,229
Reclassification adjustment of net gain from sale of available for sale securities included in income		0	(364)	0	(748)
Net unrealized gain from securities, net of reclassification adjustment		549	(4,413)	8,284	22,481
Pension plan liability adjustment:
Unrecognized net actuarial gain (loss) during the period				4,604	0
Less: amortization of unrecognized net actuarial loss included in net periodic pension cost		46	107	178	319
Pension plan liability adjustment, net		46	107	4,782	319
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	[1]	595	(4,306)	13,066	22,800
Total comprehensive income		$ 41,364	$ 23,178	$ 110,166	$ 96,948

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