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Note 3 - Investment Securities (Detail) - Amortized cost, unrealized gains and losses, and estimated fair value of available for sale investment securities portfolio (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Amortized Cost	$ 800,091	$ 618,765
Gross Unrealized Gains	27,143	22,924
Gross Unrealized Losses	(1,598)	(2,936)
Fair Value	825,636	638,753
US Treasury Securities [Member]
Amortized Cost	3,520	3,537
Gross Unrealized Gains	38	59
Fair Value	3,558	3,596
US Government-sponsored Enterprises Debt Securities [Member]
Amortized Cost	49,335	117,150
Gross Unrealized Gains	207	375
Gross Unrealized Losses	(17)	(53)
Fair Value	49,525	117,472
Residential Mortgage Backed Securities [Member]
Amortized Cost	53,078	84,961
Gross Unrealized Gains	3,855	5,457
Gross Unrealized Losses	(1)	(10)
Fair Value	56,932	90,408
Commercial Mortgage Backed Securities [Member]
Amortized Cost	4,076	4,506
Gross Unrealized Gains	69	27
Gross Unrealized Losses		(3)
Fair Value	4,145	4,530
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	200,769	234,522
Gross Unrealized Gains	14,730	11,839
Gross Unrealized Losses	(252)	(268)
Fair Value	215,247	246,093
Residential Collateralized Mortgage Obligations [Member]
Amortized Cost	219,613	49,111
Gross Unrealized Gains	1,786	2,053
Gross Unrealized Losses	(294)
Fair Value	221,105	51,164
Asset-backed Securities [Member]
Amortized Cost	16,130	7,566
Gross Unrealized Gains	18
Gross Unrealized Losses	(143)	(260)
Fair Value	16,005	7,306
FHLMC And FNMA Stock [Member]
Amortized Cost	824	824
Gross Unrealized Gains	2,061	1,027
Gross Unrealized Losses	(5)	(4)
Fair Value	2,880	1,847
Domestic Corporate Debt Securities [Member]
Amortized Cost	250,655	114,286
Gross Unrealized Gains	3,009	203
Gross Unrealized Losses	(826)	(2,290)
Fair Value	252,838	112,199
Other Securities [Member]
Amortized Cost	2,091	2,302
Gross Unrealized Gains	1,370	1,884
Gross Unrealized Losses	(60)	(48)
Fair Value	$ 3,401	$ 4,138

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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