Note 18 - Commitments and Credit Risk (Details) - USD ($)	9 Months Ended
Sep. 30, 2015	Dec. 31, 2014
Note 18 - Commitments and Credit Risk (Details) [Line Items]
Letters of Credit Outstanding, Amount	$ 26,930,000	$ 16,217,000
Standby Letters of Credit [Member]
Note 18 - Commitments and Credit Risk (Details) [Line Items]
Deferred Revenue	0	13,000
Credit Card Commitments to Extend Credit [Member]
Note 18 - Commitments and Credit Risk (Details) [Line Items]
Commitments and Contingencies	498,614,000	480,653,000
Other Loan Commitments to Extend Credit [Member]
Note 18 - Commitments and Credit Risk (Details) [Line Items]
Commitments and Contingencies	$ 792,660,000	$ 439,053,000
Minimum [Member]
Note 18 - Commitments and Credit Risk (Details) [Line Items]
Letters of Credit Term	9 months
Maximum [Member]
Note 18 - Commitments and Credit Risk (Details) [Line Items]
Letters of Credit Term	15 years

Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.

Reference 1: 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.(a),19)

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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.17)

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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.25)

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

Name:	us-gaap_CommitmentsAndContingencies
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant