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Note 15 - Disclosures About Fair Value of Financial Instruments (Detail) - Financial assets by level within the fair value hierarchy measured on a recurring basis: (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Available-for-sale securities
Available-for-sale securities	$ 191,342	$ 172,212
Assets held in trading accounts	6,224	7,541
US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities
Available-for-sale securities	152,481	153,627
US Government Agencies Debt Securities [Member]
Available-for-sale securities
Available-for-sale securities	152,481	153,627
Collateralized Mortgage Backed Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities
Available-for-sale securities	20,634	2,557
Collateralized Mortgage Backed Securities [Member]
Available-for-sale securities
Available-for-sale securities	20,634	2,557
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities
Available-for-sale securities	2,988
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities
Available-for-sale securities	2,988
Other Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities
Available-for-sale securities		1,503
Other securities	1,504
Other Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities
Available-for-sale securities		14,525
Other securities	13,735
Other Securities [Member]
Available-for-sale securities
Available-for-sale securities	15,239	16,028
Other securities	15,239
Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities
Assets held in trading accounts	1,800	1,800
Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities
Assets held in trading accounts	$ 4,424	$ 5,741

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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