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Note 3 - Investment Securities Available-for-sale - Securities in Continuous Unrealized Loss Position (Details)
$ in Thousands
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
US Government Agencies Debt Securities [Member]    
Available-for-sale securities in a continuous loss position, number of securities 14 13
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 38,625 $ 32,927
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 107 277
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 1,986
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 29
Available-for-sale securities in a continuous loss position, estimated fair value 40,611 32,927
Available-for-sale securities in a continuous loss position, unrealized losses $ 136 $ 277
Residential Mortgage Backed Securities [Member]    
Available-for-sale securities in a continuous loss position, number of securities 38 92
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 57,588 $ 157,871
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 162 1,438
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 20,789 58,954
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 188 1,722
Available-for-sale securities in a continuous loss position, estimated fair value 78,377 216,825
Available-for-sale securities in a continuous loss position, unrealized losses $ 350 $ 3,160
Corporate Debt Securities [Member]    
Available-for-sale securities in a continuous loss position, number of securities 2 4
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 4,986 $ 14,938
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 23 152
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 4,986 14,938
Available-for-sale securities in a continuous loss position, unrealized losses $ 23 $ 152
US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale securities in a continuous loss position, number of securities   2
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
Available-for-sale securities in a continuous loss position, number of securities 54 111
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 101,199 $ 207,295
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 292 1,870
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 22,775 58,954
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 217 1,722
Available-for-sale securities in a continuous loss position, estimated fair value 123,974 266,249
Available-for-sale securities in a continuous loss position, unrealized losses $ 509 $ 3,592