Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Comprehensive Income
Net income	$ 37,752	$ 34,331	$ 35,348
Other comprehensive income, net of tax
Unrecognized actuarial gains (losses)	3,261	(479)	(2,505)
Amortization of actuarial losses	696	587	311
Amortization of prior service credit	(26)	(26)	(25)
OTTI charges included in income	798	437	886
Reclassification adjustment for gains included in income	(1,700)	(26)
Unrealized (losses) gains on securities	(26,541)	6,831	9,890
Comprehensive income	$ 14,240	$ 41,655	$ 43,905