Note 3 - Securities (Detail) - Securities Portfolio (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Fair Value	$ 1,013,006	$ 1,057,802
Municipal securities	60,458	81,320
Municipal securities	1,019	1,205
Municipal securities	61,477	82,525
Trading Securities	14,469	15,282
US Government Corporations and Agencies Securities [Member]
Amortized Cost	5,060	18,000
Gross Unrealized Gains		7
Gross Unrealized Losses	(25)	(121)
Fair Value	5,035	17,886
Collateralized Residential Mortgage Obligations [Member]
Amortized Cost	383,828	377,692
Gross Unrealized Gains	2,622	4,261
Gross Unrealized Losses	(2,346)	(2,364)
Fair Value	384,104	379,589
Other Residential Mortgage-Backed Securities [Member]
Amortized Cost	81,982	100,780
Gross Unrealized Gains	5,732	5,732
Gross Unrealized Losses	(23)	(61)
Fair Value	87,691	106,451
State and Municipal [Member]
Amortized Cost	464,282	512,063
Gross Unrealized Gains	26,155	4,728
Gross Unrealized Losses	(366)	(12,800)
Fair Value	490,071	503,991
Collateralized Debt Obligations [Member]
Amortized Cost	48,759	49,695
Gross Unrealized Losses	(35,365)	(34,837)
Fair Value	13,394	14,858
Corporate Debt [Member]
Amortized Cost	27,511	29,936
Gross Unrealized Gains	2,514	2,409
Gross Unrealized Losses	(11)
Fair Value	30,014	32,345
Hedge Fund Investment [Member]
Amortized Cost	1,231	1,245
Gross Unrealized Gains	385	438
Fair Value	1,616	1,683
Other Equity Securities [Member]
Amortized Cost	958	889
Gross Unrealized Gains	123	110
Fair Value	1,081	999
Total Equity Securities [Member]
Amortized Cost	2,189	2,134
Gross Unrealized Gains	508	548
Fair Value	2,697	2,682
Total [Member]
Amortized Cost	1,013,611	1,090,300
Gross Unrealized Gains	37,531	17,685
Gross Unrealized Losses	(38,136)	(50,183)
Fair Value	$ 1,013,006	$ 1,057,802

For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading.

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- Definition

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

- 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

- Definition

For an unclassified balance sheet, this item represents investments in debt securities which are categorized as held-to-maturity. The held-to-maturity category is for those securities that the entity has the positive intent and ability to hold until maturity.

+ References

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+ Details

- Definition

This item represents the aggregate fair value of investments in debt securities as of the balance sheet date and which are categorized as held-to-maturity.

+ References+ Details

- Definition

As of the balance sheet date, the excess of fair value over carrying value (amortized cost) of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding gain.

+ References+ Details

- Definition

The total of financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition.

+ References

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-Glossary Trading Securities

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