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Note 3 - Investment Securities Available-for-sale - Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 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 $ 7,218 $ 32,927
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses $ 100 $ 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 $ 7,218 $ 32,927
Available-for-sale securities in a continuous loss position, unrealized losses 100 277
Residential Mortgage Backed Securities [Member]    
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value 55,594 157,871
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 100 1,438
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 53,087 58,954
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 512 1,722
Available-for-sale securities in a continuous loss position, estimated fair value 108,681 216,825
Available-for-sale securities in a continuous loss position, unrealized losses $ 612 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 1,559
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses $ 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 $ 1,559
Available-for-sale securities in a continuous loss position, unrealized losses 3
Corporate Debt Securities [Member]    
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 14,937 14,938
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses $ 147 $ 152
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 $ 14,937 $ 14,938
Available-for-sale securities in a continuous loss position, unrealized losses 147 152
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value 77,749 207,295
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 347 1,870
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 53,087 58,954
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 512 1,722
Available-for-sale securities in a continuous loss position, estimated fair value 130,836 266,249
Available-for-sale securities in a continuous loss position, unrealized losses $ 859 $ 3,592