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Consolidated Statements of Income (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Consolidated Statements of Income [Abstract]
Accumulated other comprehensive income reclassification for change in fair value of interest rate swap agreements	$ 97	$ 95
Accumulated other comprehensive income reclassifications for net realized gains on available-for-sale securities	76	566
Income tax expense from reclassification	$ (7)	$ 165

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Other comprehensive income loss reclassification adjustment included in net income tax.

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Before tax amount of the income statement impact of the reclassification adjustment for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Tax effect of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income. Also includes reclassification adjustments of an entity's share of an equity investee's deferred hedging gain (loss) realized in net income.

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