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Note 4 - Investment Securities Available-for-sale - Securities in Continuous Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Available-for-sale securities in a continuous loss position, number of securities 157 111
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 361,079 $ 207,295
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 5,285 1,870
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 23,170 58,954
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 619 1,722
Available-for-sale securities in a continuous loss position, estimated fair value 384,249 266,249
Available-for-sale securities in a continuous loss position, unrealized losses $ 5,904 $ 3,592
US Government Agencies Debt Securities [Member]    
Available-for-sale securities in a continuous loss position, number of securities 27 13
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 88,991 $ 32,927
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 1,764 277
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 3,768
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 38
Available-for-sale securities in a continuous loss position, estimated fair value 92,759 32,927
Available-for-sale securities in a continuous loss position, unrealized losses $ 1,802 $ 277
Residential Mortgage Backed Securities [Member]    
Available-for-sale securities in a continuous loss position, number of securities 112 92
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 232,347 $ 157,871
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 3,110 1,438
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value 19,402 58,954
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses 581 1,722
Available-for-sale securities in a continuous loss position, estimated fair value 251,749 216,825
Available-for-sale securities in a continuous loss position, unrealized losses $ 3,691 $ 3,160
US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale securities in a continuous loss position, number of securities 16 2
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value $ 34,743 $ 1,559
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 400 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 34,743 1,559
Available-for-sale securities in a continuous loss position, unrealized losses $ 400 $ 3
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 $ 4,998 $ 14,938
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses 11 152
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 4,998 14,938
Available-for-sale securities in a continuous loss position, unrealized losses $ 11 $ 152