Note 6 - Debt and Equity Securities (Detail) - Amortized cost and fair value of securities available for sale: (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Amortized Cost	$ 915,947	$ 791,730
Fair Value	949,566	812,530
Gross Unrealized Gains	41,391	36,290
Gross Unrealized Losses	7,772	15,490
US Government Agencies Debt Securities [Member]
Amortized Cost	31,409	1,980
Fair Value	31,513	2,039
Gross Unrealized Gains	104	59
Corporate Debt Securities [Member]
Amortized Cost	83,389	20,777
Fair Value	87,485	20,592
Gross Unrealized Gains	4,096
Gross Unrealized Losses		185
Municipal [Member]
Amortized Cost	74,228
Fair Value	75,297
Gross Unrealized Gains	1,152
Gross Unrealized Losses	83
Mutual Funds [Member]
Amortized Cost	21,843	21,369
Fair Value	21,843	21,369
Other Debt Obligations [Member]
Amortized Cost	17,797	26,557
Fair Value	13,315	21,242
Gross Unrealized Gains	17	9
Gross Unrealized Losses	4,499	5,324
Available For Sale Securities, Excluding Mortgage-Backed Securities [Member]
Amortized Cost	228,666	70,683
Fair Value	229,453	65,242
Gross Unrealized Gains	5,369	68
Gross Unrealized Losses	4,582	5,509
REMIC And CMO [Member]
Amortized Cost	453,468	460,824
Fair Value	474,050	473,639
Gross Unrealized Gains	23,690	22,796
Gross Unrealized Losses	3,108	9,981
GNMA [Member]
Amortized Cost	43,211	62,040
Fair Value	46,932	67,632
Gross Unrealized Gains	3,721	5,592
FNMA [Member]
Amortized Cost	168,040	175,627
Fair Value	175,929	182,630
Gross Unrealized Gains	7,971	7,003
Gross Unrealized Losses	82
FHLMC [Member]
Amortized Cost	22,562	22,556
Fair Value	23,202	23,387
Gross Unrealized Gains	640	831
Collateralized Mortgage Backed Securities [Member]
Amortized Cost	687,281	721,047
Fair Value	720,113	747,288
Gross Unrealized Gains	36,022	36,222
Gross Unrealized Losses	$ 3,190	$ 9,981

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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