Fair Value Measurements (Summary Of Available For Sale Securities) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	$ 27,909
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,733	6,711
Gross Unrealized Gains	95	132
Gross Unrealized Losses	(1)	(5)
Estimated Fair Value	9,827	6,838
Debt Securities Issued By U.S. Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,893	5,944
Gross Unrealized Gains	30	92
Gross Unrealized Losses	(9)	(12)
Estimated Fair Value	1,914	6,024
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,890	9,789
Gross Unrealized Gains	457	253
Gross Unrealized Losses		(73)
Estimated Fair Value	8,347	9,969
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,033	5,244
Gross Unrealized Gains	52	30
Gross Unrealized Losses	(35)	(48)
Estimated Fair Value	5,050	5,226
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,682	3,046
Gross Unrealized Gains	107	24
Gross Unrealized Losses	(18)	(33)
Estimated Fair Value	2,771	3,037
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	27,231	30,734
Gross Unrealized Gains	741	531
Gross Unrealized Losses	(63)	(171)
Estimated Fair Value	27,909	31,094
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	29,469	6,169
Gross Unrealized Gains	849	531
Gross Unrealized Losses	(427)	(399)
Estimated Fair Value	29,891	6,301
Available-For-Sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	56,700	36,903
Gross Unrealized Gains	1,590	1,062
Gross Unrealized Losses	(490)	(570)
Estimated Fair Value	$ 57,800	$ 37,395

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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