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Note 3 - Investment Securities (Detail) - Gross unrealized losses, investment securities portfolio (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Available for sale securities, less than 12 months, fair value $ 138,539 $ 76,345
Available for sale securities, less than 12 months, unrealized losses (758) (1,640)
Available for sale securities, 12 months or longer, fair value 41,305 49,848
Available for sale securities, 12 months or longer, unrealized losses (840) (1,296)
Available for sale securities, total, fair value 179,844 126,193
Available for sale securities, total, unrealized losses (1,598) (2,936)
Held to maturity securities, less than 12 months, fair value 96,635 102,413
Held to maturity securities, less than 12 months, unrealized losses (1,591) (784)
Held to maturity securities, 12 months or longer, fair value 14,292 21,884
Held to maturity securities, 12 months or longer, unrealized losses (215) (2,420)
Held to maturity securities, total, fair value 110,927 124,297
Held to maturity securities, total, unrealized losses (1,806) (3,204)
Residential Mortgage Backed Securities [Member]
   
Held to maturity securities, less than 12 months, fair value 113 14,032
Held to maturity securities, less than 12 months, unrealized losses   (77)
Held to maturity securities, 12 months or longer, fair value 664  
Held to maturity securities, 12 months or longer, unrealized losses (10)  
Held to maturity securities, total, fair value 777 14,032
Held to maturity securities, total, unrealized losses (10) (77)
Residential Collateralized Mortgage Obligations [Member]
   
Held to maturity securities, less than 12 months, fair value 26,683 50,355
Held to maturity securities, less than 12 months, unrealized losses (386) (373)
Held to maturity securities, 12 months or longer, fair value 9,353 15,443
Held to maturity securities, 12 months or longer, unrealized losses (175) (2,258)
Held to maturity securities, total, fair value 36,036 65,798
Held to maturity securities, total, unrealized losses (561) (2,631)
US States and Political Subdivisions Debt Securities [Member]
   
Held to maturity securities, less than 12 months, fair value 69,839 38,026
Held to maturity securities, less than 12 months, unrealized losses (1,205) (334)
Held to maturity securities, 12 months or longer, fair value 4,275 6,441
Held to maturity securities, 12 months or longer, unrealized losses (30) (162)
Held to maturity securities, total, fair value 74,114 44,467
Held to maturity securities, total, unrealized losses (1,235) (496)
US Government-sponsored Enterprises Debt Securities [Member]
   
Available for sale securities, less than 12 months, fair value 9,983 35,051
Available for sale securities, less than 12 months, unrealized losses (17) (53)
Available for sale securities, total, fair value 9,983 35,051
Available for sale securities, total, unrealized losses (17) (53)
Residential Mortgage Backed Securities [Member]
   
Available for sale securities, less than 12 months, fair value 103 3,443
Available for sale securities, less than 12 months, unrealized losses (1) (10)
Available for sale securities, 12 months or longer, fair value 11  
Available for sale securities, total, fair value 114 3,443
Available for sale securities, total, unrealized losses (1) (10)
Residential Collateralized Mortgage Obligations [Member]
   
Available for sale securities, less than 12 months, fair value 72,803  
Available for sale securities, less than 12 months, unrealized losses (294)  
Available for sale securities, total, fair value 72,803  
Available for sale securities, total, unrealized losses (294)  
US States and Political Subdivisions Debt Securities [Member]
   
Available for sale securities, less than 12 months, fair value 2,080 5,803
Available for sale securities, less than 12 months, unrealized losses (23) (61)
Available for sale securities, 12 months or longer, fair value 8,928 15,015
Available for sale securities, 12 months or longer, unrealized losses (229) (207)
Available for sale securities, total, fair value 11,008 20,818
Available for sale securities, total, unrealized losses (252) (268)
Asset-backed Securities [Member]
   
Available for sale securities, 12 months or longer, fair value 5,828 7,306
Available for sale securities, 12 months or longer, unrealized losses (143) (260)
Available for sale securities, total, fair value 5,828 7,306
Available for sale securities, total, unrealized losses (143) (260)
FHLMC And FNMA Stock [Member]
   
Available for sale securities, 12 months or longer, fair value 1 1
Available for sale securities, 12 months or longer, unrealized losses (5) (4)
Available for sale securities, total, fair value 1 1
Available for sale securities, total, unrealized losses (5) (4)
Domestic Corporate Debt Securities [Member]
   
Available for sale securities, less than 12 months, fair value 53,570 32,048
Available for sale securities, less than 12 months, unrealized losses (423) (1,516)
Available for sale securities, 12 months or longer, fair value 24,597 24,226
Available for sale securities, 12 months or longer, unrealized losses (403) (774)
Available for sale securities, total, fair value 78,167 56,274
Available for sale securities, total, unrealized losses (826) (2,290)
Other Securities [Member]
   
Available for sale securities, 12 months or longer, fair value 1,940 1,953
Available for sale securities, 12 months or longer, unrealized losses (60) (48)
Available for sale securities, total, fair value 1,940 1,953
Available for sale securities, total, unrealized losses (60) (48)
Commercial Mortgage Backed Securities [Member]
   
Available for sale securities, 12 months or longer, fair value   1,347
Available for sale securities, 12 months or longer, unrealized losses   (3)
Available for sale securities, total, fair value   1,347
Available for sale securities, total, unrealized losses   $ (3)