Note 1 - Summary of Significant Accounting Policies (Detail) - Premises and Equipment	12 Months Ended
	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