Note 2 - Investment Securities (Details) - The Amortized Costs and Estimated Fair Value of the Securities Portfolio (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Available For Sale
Available for Sale Securities - Amortized Cost	$ 618,395	$ 558,630
Available for Sale Securities - Gross Unrealized Losses	12,900
Available for Sale Securities - Estimated Fair Value	612,820	573,108
Held To Maturity
Held to Maturity Securities - Amortized Cost	765	820
Held to Maturity Securities - Estimated Fair Value	827	956
US Government-sponsored Enterprises Debt Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	96,750	75,945
Available for Sale Securities - Gross Unrealized Gains	155	216
Available for Sale Securities - Gross Unrealized Losses	3,155	66
Available for Sale Securities - Estimated Fair Value	93,750	76,095
US States and Political Subdivisions Debt Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	132,311	113,986
Available for Sale Securities - Gross Unrealized Gains	2,056	4,943
Available for Sale Securities - Gross Unrealized Losses	2,397	174
Available for Sale Securities - Estimated Fair Value	131,970	118,755
Held To Maturity
Held to Maturity Securities - Amortized Cost	765	820
Held to Maturity Securities - Gross Unrealized Gains	62	136
Held to Maturity Securities - Gross Unrealized Losses	0	0
Held to Maturity Securities - Estimated Fair Value	827	956
Residential Mortgage Backed Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	379,238	360,099
Available for Sale Securities - Gross Unrealized Gains	5,071	10,596
Available for Sale Securities - Gross Unrealized Losses	6,232	256
Available for Sale Securities - Estimated Fair Value	378,077	370,439
Commercial Mortgage Backed Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	748
Available for Sale Securities - Gross Unrealized Gains	0
Available for Sale Securities - Gross Unrealized Losses	59
Available for Sale Securities - Estimated Fair Value	689
Corporate Debt Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	7,266	6,638
Available for Sale Securities - Gross Unrealized Gains	40	44
Available for Sale Securities - Gross Unrealized Losses	1,049	856
Available for Sale Securities - Estimated Fair Value	6,257	5,826
Mutual Funds And Equity Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	2,082	1,962
Available for Sale Securities - Gross Unrealized Gains	15	33
Available for Sale Securities - Gross Unrealized Losses	20	2
Available for Sale Securities - Estimated Fair Value	2,077	1,993
Total [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	618,395	558,630
Available for Sale Securities - Gross Unrealized Gains	7,337	15,832
Available for Sale Securities - Gross Unrealized Losses	12,912	1,354
Available for Sale Securities - Estimated Fair Value	$ 612,820	$ 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

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-Name Accounting Standards Codification

-Topic 320

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-Section 45

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

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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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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

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-Paragraph 5

-Subparagraph (f)

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-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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

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-Paragraph 1

-Subparagraph (SX 210.9-03.6)

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

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- Definition

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

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

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