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Note 3 - Investment Securities (Detail) - Amortized cost, unrealized gains and losses accumulated in other comprehensive income, and fair value - available for sale investment securities portfolio (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Amortized Cost	$ 945,359	$ 800,091
Gross Unrealized Gains	28,460	27,143
Gross Unrealized Losses	(1,643)	(1,598)
Fair Value	972,176	825,636
US Treasury Securities [Member]
Amortized Cost	3,516	3,520
Gross Unrealized Gains	31	38
Fair Value	3,547	3,558
US Government-sponsored Enterprises Debt Securities [Member]
Amortized Cost	44,236	49,335
Gross Unrealized Gains	166	207
Gross Unrealized Losses	(10)	(17)
Fair Value	44,392	49,525
Residential Mortgage Backed Securities [Member]
Amortized Cost	45,756	53,078
Gross Unrealized Gains	3,157	3,855
Gross Unrealized Losses	(3)	(1)
Fair Value	48,910	56,932
Commercial Mortgage Backed Securities [Member]
Amortized Cost	3,827	4,076
Gross Unrealized Gains	63	69
Fair Value	3,890	4,145
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	195,326	200,769
Gross Unrealized Gains	13,040	14,730
Gross Unrealized Losses	(275)	(252)
Fair Value	208,091	215,247
Residential Collateralized Mortgage Obligations [Member]
Amortized Cost	268,282	219,613
Gross Unrealized Gains	2,140	1,786
Gross Unrealized Losses	(509)	(294)
Fair Value	269,913	221,105
Asset-backed Securities [Member]
Amortized Cost	15,686	16,130
Gross Unrealized Gains	25	18
Gross Unrealized Losses	(98)	(143)
Fair Value	15,613	16,005
FHLMC And FNMA Stock [Member]
Amortized Cost	825	824
Gross Unrealized Gains	4,872	2,061
Gross Unrealized Losses	(3)	(5)
Fair Value	5,694	2,880
Domestic Corporate Debt Securities [Member]
Amortized Cost	365,847	250,655
Gross Unrealized Gains	3,739	3,009
Gross Unrealized Losses	(673)	(826)
Fair Value	368,913	252,838
Other Securities [Member]
Amortized Cost	2,058	2,091
Gross Unrealized Gains	1,227	1,370
Gross Unrealized Losses	(72)	(60)
Fair Value	$ 3,213	$ 3,401

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 15D

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 16

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 15C

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 15E

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 13

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 14

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 22

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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 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