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Note 3 - Investment Securities Available-for-sale - Securities Available-for-sale by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
US Government Agencies Debt Securities [Member]    
One year or less, amortized cost $ 37,414 $ 31,436
One year or less, estimated fair value 37,380 31,361
After one year through five years, amortized cost 18,448 18,826
After one year through five years, estimated fair value 18,984 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, without maturity date 264,101 299,709
Estimated fair value, without maturity date 266,035 297,241
US States and Political Subdivisions Debt Securities [Member]    
One year or less, amortized cost 1,057 4,450
One year or less, estimated fair value 1,080 4,478
After one year through five years, amortized cost 42,625 41,213
After one year through five years, estimated fair value 44,701 43,720
Five years through ten years, amortized cost 50,165 66,001
Five years through ten years, estimated fair value 52,868 67,398
After ten years, amortized cost 1,076 2,589
After ten years, estimated fair value 1,228 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 4,986 14,938
Five years through ten years, amortized cost 3,000
Five years through ten years, estimated fair value 3,068
Equity Investment Other [Member]    
Amortized cost, without maturity date 310 307
Estimated fair value, without maturity date 338 334
Amortized cost 423,205 486,134
Estimated fair value $ 430,668 $ 487,869