Note 10 - Fair Value of Financial Instruments (Detail) - Quantitative information about non-recurring Level 3 fair value of financial instruments and the fair value measurements: (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Loans Held For Sale [Member] | Minimum [Member]
Assets:
Range	3.80%
Loans Held For Sale [Member] | Maximum [Member]
Assets:
Range	45.90%
Loans Held For Sale [Member]
Assets:
Fair Value (in Dollars)	9,907
Valuation Technique	Fair value of collateral
Unobservable Input	Loss severity discount
Weighted Average	(26.70%)
Impaired loans [Member] | Minimum [Member]
Assets:
Range	0.20%
Impaired loans [Member] | Maximum [Member]
Assets:
Range	90.70%
Impaired loans [Member]
Assets:
Fair Value (in Dollars)	39,689
Valuation Technique	Fair value of collateral
Unobservable Input	Loss severity discount
Weighted Average	(26.80%)
Other real estate owned [Member] | Minimum [Member]
Assets:
Range	0.00%
Other real estate owned [Member] | Maximum [Member]
Assets:
Range	80.70%
Other real estate owned [Member]
Assets:
Fair Value (in Dollars)	2,189
Valuation Technique	Fair value of collateral
Unobservable Input	Loss severity discount
Weighted Average	(25.30%)