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Federal Income Tax (Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Computed expected income tax expense (benefit)	$ 16,126	$ (4,451)	$ 20,434
Tax-exempt municipal bond interest income	(8,027)	(7,908)	(7,287)
Nontaxable dividend income	(1,004)	(859)	(751)
Valuation allowance reduction	(547)	0	(1,643)
Acquisition related expenses	42	860	403
Other, net	(728)	(368)	(286)
Federal income tax expense (benefit)	$ 5,862	$ (12,726)	$ 10,870

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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- Definition

The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in the valuation allowance for deferred tax assets in the period.

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- Definition

The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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