CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other comprehensive income (loss):
Net unrealized gain (loss) on available-for-sale securities, taxes	$ 2,940	$ 473	$ 1,994
Change in nonqualified pension plan unrecognized net gain (loss) and unrecognized prior service cost, taxes	38	1	102
Nonqualified pension plan curtailment, taxes			80
Net realized gain on sale of available-for-sale securities included in net income, taxes	$ 418	$ 630	$ 323