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Note 4 - Securities (Detail) - Securities with Unrealized Losses not Recognized in Income (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Available for Sale Securities with Unrealized Losses, Less than 12 Months, Fair Value $ 47,271 $ 3,738
Available for Sale Securities with Unrealized Losses, Less than 12 Months, Unrealized Losses (163) (2)
Available for Sale Securities with Unrealized Losses, 12 Months or More, Fair Value 1,816 44,904
Available for Sale Securities with Unrealized Losses, 12 Months or More, Unrealized Losses (7) (148)
Available for Sale Securities with Unrealized Losses, Fair Value 49,087 48,642
Available for Sale Securities with Unrealized Losses, Unrealized Losses (170) (150)
US Government Agencies Debt Securities [Member]
   
Available for Sale Securities with Unrealized Losses, Less than 12 Months, Fair Value 10,135 0
Available for Sale Securities with Unrealized Losses, Less than 12 Months, Unrealized Losses (15) 0
Available for Sale Securities with Unrealized Losses, 12 Months or More, Fair Value 0 17,974
Available for Sale Securities with Unrealized Losses, 12 Months or More, Unrealized Losses 0 (25)
Available for Sale Securities with Unrealized Losses, Fair Value 10,135 17,974
Available for Sale Securities with Unrealized Losses, Unrealized Losses (15) (25)
Municipal Securities [Member]
   
Available for Sale Securities with Unrealized Losses, Less than 12 Months, Fair Value 17,141  
Available for Sale Securities with Unrealized Losses, Less than 12 Months, Unrealized Losses (93)  
Available for Sale Securities with Unrealized Losses, 12 Months or More, Fair Value 582  
Available for Sale Securities with Unrealized Losses, 12 Months or More, Unrealized Losses (2)  
Available for Sale Securities with Unrealized Losses, Fair Value 17,723  
Available for Sale Securities with Unrealized Losses, Unrealized Losses (95)  
Mortgage-backed Securities, Issued by Private Enterprises [Member]
   
Available for Sale Securities with Unrealized Losses, Less than 12 Months, Fair Value 0 0
Available for Sale Securities with Unrealized Losses, Less than 12 Months, Unrealized Losses 0 0
Available for Sale Securities with Unrealized Losses, 12 Months or More, Fair Value 513 18,091
Available for Sale Securities with Unrealized Losses, 12 Months or More, Unrealized Losses (2) (87)
Available for Sale Securities with Unrealized Losses, Fair Value 513 18,091
Available for Sale Securities with Unrealized Losses, Unrealized Losses (2) (87)
Collateralized Mortgage Obligations [Member]
   
Available for Sale Securities with Unrealized Losses, Less than 12 Months, Fair Value 19,995 0
Available for Sale Securities with Unrealized Losses, Less than 12 Months, Unrealized Losses (55) 0
Available for Sale Securities with Unrealized Losses, 12 Months or More, Fair Value 721 6,590
Available for Sale Securities with Unrealized Losses, 12 Months or More, Unrealized Losses (3) (15)
Available for Sale Securities with Unrealized Losses, Fair Value 20,716 6,590
Available for Sale Securities with Unrealized Losses, Unrealized Losses (58) (15)
US States and Political Subdivisions Debt Securities [Member]
   
Available for Sale Securities with Unrealized Losses, Less than 12 Months, Fair Value   3,738
Available for Sale Securities with Unrealized Losses, Less than 12 Months, Unrealized Losses   (2)
Available for Sale Securities with Unrealized Losses, 12 Months or More, Fair Value   2,249
Available for Sale Securities with Unrealized Losses, 12 Months or More, Unrealized Losses   (21)
Available for Sale Securities with Unrealized Losses, Fair Value   5,987
Available for Sale Securities with Unrealized Losses, Unrealized Losses   $ (23)