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Note 1 - Summary of Significant Accounting Policies (Detail) - Premises and Equipment | 12 Months Ended
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Dec. 31, 2012
Building [Member] | Minimum [Member] |
Estimated useful life | 15 years
Building [Member] | Maximum [Member] |
Estimated useful life | 45 years
Building Improvements [Member] | Minimum [Member] |
Estimated useful life | 5 years
Building Improvements [Member] | Maximum [Member] |
Estimated useful life | 20 years
Furniture, Fixtures, and Equipment [Member] | Minimum [Member] |
Estimated useful life | 3 years
Furniture, Fixtures, and Equipment [Member] | Maximum [Member] |
Estimated useful life | 25 years
Leasehold Improvements [Member] | Minimum [Member] |
Leasehold improvements | Shorter of useful lives or the terms of the leases

X
- Definition Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2155824 + Details
Name: | us-gaap_PropertyPlantAndEquipmentEstimatedUsefulLives
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration