Note 3 - Investment Securities Available for Sale (Detail) - Amortized Cost And Estimated Fair Value Of Securities Available For Sale (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Amortized Cost	$ 286,319	$ 305,686
Gross Unrealized Gains	10,431	8,541
Gross Unrealized Losses	387	416
Estimated Fair Value	296,363	313,811
US Government Agencies Debt Securities [Member]
Amortized Cost	44,718	102,283
Gross Unrealized Gains	1,545	1,547
Gross Unrealized Losses		77
Estimated Fair Value	46,263	103,753
Residential Mortgage Backed Securities [Member]
Amortized Cost	168,439	145,451
Gross Unrealized Gains	3,240	2,767
Gross Unrealized Losses	305	240
Estimated Fair Value	171,374	147,978
Municipal Bond [Member]
Amortized Cost	72,755	57,548
Gross Unrealized Gains	5,646	4,227
Gross Unrealized Losses	30	2
Estimated Fair Value	78,371	61,773
Equity Investment Other [Member]
Amortized Cost	407	404
Gross Unrealized Losses	52	97
Estimated Fair Value	$ 355	$ 307

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.

+ References+ Details

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.

+ References+ Details

- 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.

+ References+ Details