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Note 2 - Investment Securities (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Available-for-sale Securities Pledged as Collateral $ 285,000,000 $ 334,000,000
Available-for-sale Securities, Gross Unrealized Losses 1,400,000  
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss) before Taxes 479,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 856,000  
Investment Securities Continuous Unrealized Loss Position Twelve Months Or Longer 63.20%  
Available-for-sale Securities, Amortized Cost Basis 558,630,000 583,951,000
Loss Decrease [Member]
   
Percent Change Unrealized Loss Investment Securities 26.10%  
Single Issuer Corporate Debt Security [Member]
   
Available-for-sale Securities, Amortized Cost Basis $ 5,000,000