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Note 3 - Investment Securities Available-for-sale - Securities Available-for-sale by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
US Government Agencies Debt Securities [Member]    
One year or less, amortized cost $ 36,534 $ 31,436
One year or less, estimated fair value 36,613 31,361
After one year through five years, amortized cost 13,907 18,826
After one year through five years, estimated fair value 14,274 19,047
Five years through ten years, amortized cost 4,507 6,513
Five years through ten years, estimated fair value 4,735 6,567
Residential Mortgage Backed Securities [Member]    
Amortized cost 305,351 299,709
Estimated fair value 306,812 297,241
US States and Political Subdivisions Debt Securities [Member]    
One year or less, amortized cost 4,423 4,450
One year or less, estimated fair value 4,438 4,478
After one year through five years, amortized cost 41,357 41,213
After one year through five years, estimated fair value 43,872 43,720
Five years through ten years, amortized cost 56,870 66,001
Five years through ten years, estimated fair value 59,114 67,398
After ten years 2,190 2,589
After ten years, estimated fair value 2,485 2,785
Corporate Debt Securities [Member]    
After one year through five years, amortized cost 15,085 15,090
After one year through five years, estimated fair value 14,938 14,938
Equity Investment Other [Member]    
Amortized cost 310 307
Estimated fair value 328 334
Amortized cost 480,534 486,134
Estimated fair value $ 487,609 $ 487,869