Consolidated Condensed Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Statement of Other Comprehensive Income [Abstract]
Change in pension plan assets and benefit obligations, Tax effect	$ 0	$ 222
Unrealized net holding gain on cash flow hedge, Tax expense (benefit)		60
Unrealized net holding loss on securities available-for-sale, Tax expense (benefit)	$ (1,282)	$ (1,188)