Note 19 - Derivative Instruments and Hedging Activities (Detail) - Interest Rate Derivatives Portfolio (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Related to fixed rate commercial loans
Notional amount outstanding	$ 16,947		$ 17,994
Weighted-average interest rate received	2.19%		2.17%
Weighted-average interest rate paid	6.39%		6.40%
Weighted-average maturity (in years)	5.76		6.76
Derivative liability fair value	(2,459)		(1,833)
Cash pledged to collateralize net unrealized losses with counterparties (1)	2,516	[1]	1,836	[1]
Aggregate fair value of assets needed to settle the instruments immediately (if the credit risk-related contingent features were triggered)	$ 2,492		$ 1,868

[1] No other collateral was required to be pledged.