Note 7 - Investment Securities (Details) - The Amortized Costs And Estimated Fair Value Of The Securities Portfolio (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
Jun. 30, 2013	Dec. 31, 2012
Available For Sale
Available for Sale Securities - Amortized Cost	$ 564,290	$ 558,630
Available for Sale Securities - Gross Unrealized Losses	10,300
Available for Sale Securities - Estimated Fair Value	561,506	573,108
Held To Maturity
Held to Maturity Securities - Amortized Cost	820	820
Held to Maturity Securities - Estimated Fair Value	910	956
US Government-sponsored Enterprises Debt Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	80,211	75,945
Available for Sale Securities - Gross Unrealized Gains	71	216
Available for Sale Securities - Gross Unrealized Losses	2,357	66
Available for Sale Securities - Estimated Fair Value	77,925	76,095
US States and Political Subdivisions Debt Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	129,786	113,986
Available for Sale Securities - Gross Unrealized Gains	2,286	4,943
Available for Sale Securities - Gross Unrealized Losses	2,371	174
Available for Sale Securities - Estimated Fair Value	129,701	118,755
Held To Maturity
Held to Maturity Securities - Amortized Cost	820	820
Held to Maturity Securities - Gross Unrealized Gains	90	136
Held to Maturity Securities - Gross Unrealized Losses	0	0
Held to Maturity Securities - Estimated Fair Value	910	956
Residential Mortgage Backed Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	345,694	360,099
Available for Sale Securities - Gross Unrealized Gains	5,117	10,596
Available for Sale Securities - Gross Unrealized Losses	4,466	256
Available for Sale Securities - Estimated Fair Value	346,345	370,439
Corporate Debt Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	6,898	6,638
Available for Sale Securities - Gross Unrealized Gains	37	44
Available for Sale Securities - Gross Unrealized Losses	1,098	856
Available for Sale Securities - Estimated Fair Value	5,837	5,826
Mutual Funds And Equity Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	1,701	1,962
Available for Sale Securities - Gross Unrealized Gains	19	33
Available for Sale Securities - Gross Unrealized Losses	22	2
Available for Sale Securities - Estimated Fair Value	1,698	1,993
Total [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	564,290	558,630
Available for Sale Securities - Gross Unrealized Gains	7,530	15,832
Available for Sale Securities - Gross Unrealized Losses	10,314	1,354
Available for Sale Securities - Estimated Fair Value	$ 561,506	$ 573,108

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- Definition

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

+ References

Reference 1: 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=28360136&loc=d3e22054-111558

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

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

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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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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- Definition

Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.6)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Fair value of investments in debt securities classified as held-to-maturity.

+ References

+ Details

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- Definition

Amount of unrecognized gain before loss on investments in held-to-maturity securities.

+ References

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- Definition

Amount of unrecognized loss before gain on investments in held-to-maturity securities. Excludes write-down for other than temporary impairment (OTTI).

+ References

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