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Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Consolidated Statements of Comprehensive Income [Abstract]
Net unrealized on investment, net of tax expenses, available-for-sale	$ 469	$ (347)
Adjustment for pension and other postretirement benefits, net of tax expenses	$ 186	$ 63

Tax effects of the increase (decrease) to accumulated comprehensive income during the period related to benefit plans. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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- Definition

Tax effect on the reclassification adjustment for gains or losses realized upon the sale of securities during the period.

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