Note 9 - Fair Value of Assets and Liabilities (Detail) - Assets Measured at Fair Value on a Recurring Basis (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Available-for-sale securities
Securities	$ 215,881	$ 251,747
US Government and Government Sponsored Entities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Available-for-sale securities
Securities	66,173	78,022
US Government and Government Sponsored Entities [Member] \| Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities
Securities	66,173	78,022
US Government and Government Sponsored Entities [Member]
Available-for-sale securities
Securities	66,173	78,022
US States and Political Subdivisions Debt Securities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Available-for-sale securities
Securities	51,462	95,483
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities
Securities	51,462	95,483
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities
Securities	51,462	95,483
Collateralized Mortgage Obligations [Member]
Available-for-sale securities
Securities	95,046	78,242
GSE Residential [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Available-for-sale securities
Securities	95,046	78,242
GSE Residential [Member] \| Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities
Securities	95,046	78,242
Mutual Funds [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Available-for-sale securities
Securities	3,200
Mutual Funds [Member] \| Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities
Securities	3,200
Mutual Funds [Member]
Available-for-sale securities
Securities	3,200
Estimate of Fair Value, Fair Value Disclosure [Member]
Available-for-sale securities
Securities	215,881	251,747
Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities
Securities	$ 215,881	$ 251,747

- Definition

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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