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Note 3 - Investment Securities Available-for-sale - Securities Available-for-sale by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
US Government Agencies Debt Securities [Member]    
One year or less, amortized cost $ 19,550 $ 31,436
One year or less, estimated fair value 19,603 31,361
After one year through five years, amortized cost 18,431 18,826
After one year through five years, estimated fair value 19,098 19,047
Five years through ten years, amortized cost 6,513
Five years through ten years, estimated fair value 6,567
Residential Mortgage Backed Securities [Member]    
Amortized cost 258,406 299,709
Estimated fair value 260,884 297,241
US States and Political Subdivisions Debt Securities [Member]    
One year or less, amortized cost 4,303 4,450
One year or less, estimated fair value 4,320 4,478
After one year through five years, amortized cost 36,708 41,213
After one year through five years, estimated fair value 38,945 43,720
Five years through ten years, amortized cost 56,747 66,001
Five years through ten years, estimated fair value 60,109 67,398
After ten years 1,077 2,589
After ten years, estimated fair value 1,248 2,785
Corporate Debt Securities [Member]    
After one year through five years, amortized cost 5,009 15,090
After one year through five years, estimated fair value 4,969 14,938
Equity Investment Other [Member]    
Amortized cost 310 307
Estimated fair value 336 334
Amortized cost 400,541 486,134
Estimated fair value $ 409,512 $ 487,869