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Note 3 - Investment Securities (Detail) - Gross unrealized losses - investments (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Available for sale securities, less than 12 months, fair value $ 166,741 $ 138,539
Available for sale securities, less than 12 months, unrealized losses (929) (758)
Available for sale securities, 12 months or longer, fair value 37,007 41,305
Available for sale securities, 12 months or longer, unrealized losses (714) (840)
Available for sale securities, total, fair value 203,748 179,844
Available for sale securities, total, unrealized losses (1,643) (1,598)
Held to maturity securities, less than 12 months, fair value 163,609 96,635
Held to maturity securities, less than 12 months, unrealized losses (2,949) (1,591)
Held to maturity securities, 12 months or longer, fair value 29,432 14,292
Held to maturity securities, 12 months or longer, unrealized losses (349) (215)
Held to maturity securities, total, fair value 193,041 110,927
Held to maturity securities, total, unrealized losses (3,298) (1,806)
Residential Mortgage Backed Securities [Member]
   
Held to maturity securities, less than 12 months, fair value 255 113
Held to maturity securities, 12 months or longer, fair value 7,775 664
Held to maturity securities, 12 months or longer, unrealized losses (14) (10)
Held to maturity securities, total, fair value 8,030 777
Held to maturity securities, total, unrealized losses (14) (10)
US States and Political Subdivisions Debt Securities [Member]
   
Held to maturity securities, less than 12 months, fair value 153,086 69,839
Held to maturity securities, less than 12 months, unrealized losses (2,782) (1,205)
Held to maturity securities, 12 months or longer, fair value 8,887 4,275
Held to maturity securities, 12 months or longer, unrealized losses (131) (30)
Held to maturity securities, total, fair value 161,973 74,114
Held to maturity securities, total, unrealized losses (2,913) (1,235)
Residential Collateralized Mortgage Obligations [Member]
   
Held to maturity securities, less than 12 months, fair value 10,268 26,683
Held to maturity securities, less than 12 months, unrealized losses (167) (386)
Held to maturity securities, 12 months or longer, fair value 12,770 9,353
Held to maturity securities, 12 months or longer, unrealized losses (204) (175)
Held to maturity securities, total, fair value 23,038 36,036
Held to maturity securities, total, unrealized losses (371) (561)
US Government-sponsored Enterprises Debt Securities [Member]
   
Available for sale securities, less than 12 months, fair value 9,990 9,983
Available for sale securities, less than 12 months, unrealized losses (10) (17)
Available for sale securities, total, fair value 9,990 9,983
Available for sale securities, total, unrealized losses (10) (17)
Residential Mortgage Backed Securities [Member]
   
Available for sale securities, less than 12 months, fair value 64 103
Available for sale securities, less than 12 months, unrealized losses (1) (1)
Available for sale securities, 12 months or longer, fair value 884 11
Available for sale securities, 12 months or longer, unrealized losses (2)  
Available for sale securities, total, fair value 948 114
Available for sale securities, total, unrealized losses (3) (1)
US States and Political Subdivisions Debt Securities [Member]
   
Available for sale securities, less than 12 months, fair value 3,107 2,080
Available for sale securities, less than 12 months, unrealized losses (23) (23)
Available for sale securities, 12 months or longer, fair value 9,030 8,928
Available for sale securities, 12 months or longer, unrealized losses (252) (229)
Available for sale securities, total, fair value 12,137 11,008
Available for sale securities, total, unrealized losses (275) (252)
Residential Collateralized Mortgage Obligations [Member]
   
Available for sale securities, less than 12 months, fair value 85,377 72,803
Available for sale securities, less than 12 months, unrealized losses (509) (294)
Available for sale securities, total, fair value 85,377 72,803
Available for sale securities, total, unrealized losses (509) (294)
Asset-backed Securities [Member]
   
Available for sale securities, 12 months or longer, fair value 5,449 5,828
Available for sale securities, 12 months or longer, unrealized losses (98) (143)
Available for sale securities, total, fair value 5,449 5,828
Available for sale securities, total, unrealized losses (98) (143)
FHLMC And FNMA Stock [Member]
   
Available for sale securities, 12 months or longer, fair value 3 1
Available for sale securities, 12 months or longer, unrealized losses (3) (5)
Available for sale securities, total, fair value 3 1
Available for sale securities, total, unrealized losses (3) (5)
Domestic Corporate Debt Securities [Member]
   
Available for sale securities, less than 12 months, fair value 68,203 53,570
Available for sale securities, less than 12 months, unrealized losses (386) (423)
Available for sale securities, 12 months or longer, fair value 19,713 24,597
Available for sale securities, 12 months or longer, unrealized losses (287) (403)
Available for sale securities, total, fair value 87,916 78,167
Available for sale securities, total, unrealized losses (673) (826)
Other Securities [Member]
   
Available for sale securities, 12 months or longer, fair value 1,928 1,940
Available for sale securities, 12 months or longer, unrealized losses (72) (60)
Available for sale securities, total, fair value 1,928 1,940
Available for sale securities, total, unrealized losses $ (72) $ (60)