Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Comprehensive Income
Net income	$ 9,627	$ 8,637	$ 16,383	$ 15,766
Amortization of actuarial losses	174	149	348	298
Amortization of prior service credits	(6)	(7)	(12)	(13)
OTTI charges included in income	283	437	283	437
Unrealized gains (losses) on securities, net	(15,634)	2,052	(19,837)	3,269
Comprehensive income (loss)	$ (5,556)	$ 11,268	$ (2,835)	$ 19,757