Note 6 - Investment Securities (Details) - The Amortized Costs And Estimated Fair Value Of The Securities Portfolio (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2014	Dec. 31, 2013
Available For Sale
Available for Sale Securities - Amortized Cost	$ 607,667	$ 618,395
Available for Sale Securities - Gross Unrealized Losses	8,300	12,900
Available for Sale Securities - Estimated Fair Value	607,764	612,820
Held To Maturity
Held to Maturity Securities - Amortized Cost	3,827	765
Held to Maturity Securities - Estimated Fair Value	3,929	827
US Government-sponsored Enterprises Debt Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	93,723	96,750
Available for Sale Securities - Gross Unrealized Gains	162	155
Available for Sale Securities - Gross Unrealized Losses	2,301	3,155
Available for Sale Securities - Estimated Fair Value	91,584	93,750
US States and Political Subdivisions Debt Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	127,048	132,311
Available for Sale Securities - Gross Unrealized Gains	2,485	2,056
Available for Sale Securities - Gross Unrealized Losses	1,291	2,397
Available for Sale Securities - Estimated Fair Value	128,242	131,970
Held To Maturity
Held to Maturity Securities - Amortized Cost	3,827	765
Held to Maturity Securities - Gross Unrealized Gains	102	62
Held to Maturity Securities - Gross Unrealized Losses	0	0
Held to Maturity Securities - Estimated Fair Value	3,929	827
Residential Mortgage Backed Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	376,779	379,238
Available for Sale Securities - Gross Unrealized Gains	5,709	5,071
Available for Sale Securities - Gross Unrealized Losses	4,006	6,232
Available for Sale Securities - Estimated Fair Value	378,482	378,077
Commercial Mortgage Backed Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	745	748
Available for Sale Securities - Gross Unrealized Gains	0	0
Available for Sale Securities - Gross Unrealized Losses	48	59
Available for Sale Securities - Estimated Fair Value	697	689
Corporate Debt Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	7,120	7,266
Available for Sale Securities - Gross Unrealized Gains	45	40
Available for Sale Securities - Gross Unrealized Losses	673	1,049
Available for Sale Securities - Estimated Fair Value	6,492	6,257
Mutual Funds And Equity Securities [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	2,252	2,082
Available for Sale Securities - Gross Unrealized Gains	27	15
Available for Sale Securities - Gross Unrealized Losses	12	20
Available for Sale Securities - Estimated Fair Value	2,267	2,077
Total [Member]
Available For Sale
Available for Sale Securities - Amortized Cost	607,667	618,395
Available for Sale Securities - Gross Unrealized Gains	8,428	7,337
Available for Sale Securities - Gross Unrealized Losses	8,331	12,912
Available for Sale Securities - Estimated Fair Value	$ 607,764	$ 612,820

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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

+ Details

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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

+ Details

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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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