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Note 6 - Investment Securities Available For Sale (Detail) - Gross Unrealized Losses and Fair Value (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Securities in Continuous Unrealized Loss Position Less than Twelve Months Fair Value $ 42,527 $ 31,531
Securities in Continuous Unrealized Loss Position Less than Twelve Months Gross Unrealized Losses (637) (260)
Securities in Continuous Unrealized Loss Position Twelve Months or Greater Fair Value 0 0
Securities in Continuous Unrealized Loss Position Twelve Months or Greater Gross Unrealized Losses 0 0
Securities in Continuous Unrealized Loss Position Fair Value 42,527 31,531
Securities in Continuous Unrealized Loss Position Gross Unrealized Losses (637) (260)
US Government Agencies Debt Securities [Member]
   
Securities in Continuous Unrealized Loss Position Less than Twelve Months Fair Value 11,925 9,938
Securities in Continuous Unrealized Loss Position Less than Twelve Months Gross Unrealized Losses (81) (91)
Securities in Continuous Unrealized Loss Position Twelve Months or Greater Fair Value 0 0
Securities in Continuous Unrealized Loss Position Twelve Months or Greater Gross Unrealized Losses 0 0
Securities in Continuous Unrealized Loss Position Fair Value 11,925 9,938
Securities in Continuous Unrealized Loss Position Gross Unrealized Losses (81) (91)
US States and Political Subdivisions Debt Securities [Member]
   
Securities in Continuous Unrealized Loss Position Less than Twelve Months Fair Value 14,834 9,240
Securities in Continuous Unrealized Loss Position Less than Twelve Months Gross Unrealized Losses (391) (104)
Securities in Continuous Unrealized Loss Position Twelve Months or Greater Fair Value 0 0
Securities in Continuous Unrealized Loss Position Twelve Months or Greater Gross Unrealized Losses 0 0
Securities in Continuous Unrealized Loss Position Fair Value 14,834 9,240
Securities in Continuous Unrealized Loss Position Gross Unrealized Losses (391) (104)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
   
Securities in Continuous Unrealized Loss Position Less than Twelve Months Fair Value 15,768 12,353
Securities in Continuous Unrealized Loss Position Less than Twelve Months Gross Unrealized Losses (165) (65)
Securities in Continuous Unrealized Loss Position Twelve Months or Greater Fair Value 0 0
Securities in Continuous Unrealized Loss Position Twelve Months or Greater Gross Unrealized Losses 0 0
Securities in Continuous Unrealized Loss Position Fair Value 15,768 12,353
Securities in Continuous Unrealized Loss Position Gross Unrealized Losses $ (165) $ (65)