Note 17 - Commitments and Credit Risk (Detail) (USD $)									9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Standby Letters of Credit [Member]	Dec. 31, 2011 Standby Letters of Credit [Member]	Sep. 30, 2012 Credit Card Commitments to Extend Credit [Member]	Dec. 31, 2011 Credit Card Commitments to Extend Credit [Member]	Sep. 30, 2012 Other Loan Commitments to Extend Credit [Member]	Dec. 31, 2011 Other Loan Commitments to Extend Credit [Member]	Sep. 30, 2012 Minimum [Member]	Sep. 30, 2012 Maximum [Member]
Other Commitment Other Loans					$ 401,292,000	$ 343,400,000
Other Commitment Credit Cards							289,760,000	285,487,000
Letters of Credit Outstanding, Amount	9,811,000	9,269,000
Letters of Credit Term									12 months	21 months
Deferred Revenue			$ 15,000	$ 33,000