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Note 5 - Investment Securities Available For Sale (Detail) - Amortized Cost and Fair Values of Securities Available for Sale (USD $)
Sep. 30, 2012
Dec. 31, 2011
Available for Sale Securities Amortized Cost $ 170,046,000 $ 187,097,000
Available for Sale Securities Gross Unrealized Gains 9,127,000 7,104,000
Available for Sale Securities Gross Unrealized Losses (33,000) (224,000)
Available for Sale Securities Fair Value 179,140,000 193,977,000
Taxable [Member] | US States and Political Subdivisions Debt Securities [Member]
   
Available for Sale Securities Amortized Cost 8,198,000 8,207,000
Available for Sale Securities Gross Unrealized Gains 864,000 766,000
Available for Sale Securities Fair Value 9,062,000 8,973,000
Tax-exempt [Member] | US States and Political Subdivisions Debt Securities [Member]
   
Available for Sale Securities Amortized Cost 78,808,000 75,807,000
Available for Sale Securities Gross Unrealized Gains 4,827,000 3,681,000
Available for Sale Securities Gross Unrealized Losses (29,000) (61,000)
Available for Sale Securities Fair Value 83,606,000 79,427,000
US Government Agencies Debt Securities [Member]
   
Available for Sale Securities Amortized Cost 16,733,000 31,520,000
Available for Sale Securities Gross Unrealized Gains 537,000 427,000
Available for Sale Securities Gross Unrealized Losses (2,000) (14,000)
Available for Sale Securities Fair Value 17,268,000 31,933,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
   
Available for Sale Securities Amortized Cost 60,139,000 63,808,000
Available for Sale Securities Gross Unrealized Gains 2,328,000 1,819,000
Available for Sale Securities Gross Unrealized Losses   (54,000)
Available for Sale Securities Fair Value 62,467,000 65,573,000
Mortgage-backed Securities, Issued by Private Enterprises [Member]
   
Available for Sale Securities Amortized Cost 5,418,000 7,005,000
Available for Sale Securities Gross Unrealized Gains 570,000 411,000
Available for Sale Securities Gross Unrealized Losses (2,000) (95,000)
Available for Sale Securities Fair Value 5,986,000 7,321,000
Debt Securities [Member]
   
Available for Sale Securities Amortized Cost 169,296,000 186,347,000
Available for Sale Securities Gross Unrealized Gains 9,126,000 7,104,000
Available for Sale Securities Gross Unrealized Losses (33,000) (224,000)
Available for Sale Securities Fair Value 178,389,000 193,227,000
Equity Securities in Financial Institutions [Member]
   
Available for Sale Securities Amortized Cost 750,000 750,000
Available for Sale Securities Gross Unrealized Gains 1,000  
Available for Sale Securities Fair Value $ 751,000 $ 750,000