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Note 4 - Investment Securities Available-for-sale - Securities Available-for-sale by Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Amortized cost $ 541,364 $ 486,134
Estimated fair value 538,108 487,869
US Government Agencies Debt Securities [Member]    
One year or less, amortized cost 83,885 31,436
One year or less, estimated fair value 82,548 31,361
After one year through five years, amortized cost 20,736 18,826
After one year through five years, estimated fair value 20,897 19,047
Five years through ten years, amortized cost 2,804 6,513
Five years through ten years, estimated fair value 2,697 6,567
Residential Mortgage Backed Securities [Member]    
Amortized cost, without maturity date 329,606 299,709
Estimated fair value, without maturity date 326,239 297,241
US States and Political Subdivisions Debt Securities [Member]    
One year or less, amortized cost 1,056 4,450
One year or less, estimated fair value 1,070 4,478
After one year through five years, amortized cost 45,808 41,213
After one year through five years, estimated fair value 46,865 43,720
Five years through ten years, amortized cost 46,668 66,001
Five years through ten years, estimated fair value 46,839 67,398
After ten years, amortized cost 1,075 2,589
After ten years, estimated fair value 1,156 2,785
After ten years, estimated fair value 1,156 2,785
Corporate Debt Securities [Member]    
After one year through five years, amortized cost 8,008 15,090
After one year through five years, estimated fair value 8,079 14,938
After ten years, amortized cost 1,500
After ten years, estimated fair value 1,500
After ten years, estimated fair value 1,500
Equity Investment Other [Member]    
Amortized cost, without maturity date 218 307
Estimated fair value, without maturity date $ 218 $ 334