Note 17 - Commitments and Credit Risk (Detail) (USD $)									12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Standby Letters of Credit [Member]	Dec. 31, 2011 Standby Letters of Credit [Member]	Dec. 31, 2012 Credit Card Commitments to Extend Credit [Member]	Dec. 31, 2011 Credit Card Commitments to Extend Credit [Member]	Dec. 31, 2012 Other Loan Commitments to Extend Credit [Member]	Dec. 31, 2011 Other Loan Commitments to Extend Credit [Member]	Dec. 31, 2012 Bonds Issued By A Single Municipality As a Percentage of the Investment Portfolio [Member] Maximum [Member]	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2012 Maximum [Member]
Commitments and Contingencies					$ 401,817,000	$ 343,400,000	$ 301,444,000	$ 285,487,000
Letters of Credit Outstanding, Amount	9,901,000	9,269,000
Letters of Credit Term										7 months	5 years
Deferred Revenue			$ 10,000	$ 33,000
Concentration Risk, Percentage									5.00%