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Note 3 - Investment Securities Available-for-sale - Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
US Government Agencies Debt Securities [Member]    
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 6,798 $ 32,927
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 69 277
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses
Available-for-sale securities in a continuous loss position, estimated fair value 6,798 32,927
Available-for-sale securities in a continuous loss position, unrealized losses 69 277
Residential Mortgage Backed Securities [Member]    
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value 14,956 157,871
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 33 1,438
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 23,512 58,954
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 198 1,722
Available-for-sale securities in a continuous loss position, estimated fair value 38,468 216,825
Available-for-sale securities in a continuous loss position, unrealized losses 231 3,160
US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value 2,500 1,559
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 1 3
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses
Available-for-sale securities in a continuous loss position, estimated fair value 2,500 1,559
Available-for-sale securities in a continuous loss position, unrealized losses 1 3
Corporate Debt Securities [Member]    
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value 3,702 14,938
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 30 152
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 1,267
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 10
Available-for-sale securities in a continuous loss position, estimated fair value 4,969 14,938
Available-for-sale securities in a continuous loss position, unrealized losses 40 152
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value 27,956 207,295
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 133 1,870
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 24,779 58,954
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 208 1,722
Available-for-sale securities in a continuous loss position, estimated fair value 52,735 266,249
Available-for-sale securities in a continuous loss position, unrealized losses $ 341 $ 3,592