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Note 4 - Investment Securities Available-for-sale (Details) - Securities Available-for-sale by Contractual Maturity - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
U. S. agency securities maturing:    
Amortized cost $ 486,134 $ 377,933
Estimated fair value 487,869 382,343
US Government Agencies Debt Securities [Member]    
U. S. agency securities maturing:    
One year or less, amortized cost 31,436 2,998
One year or less, estimated fair value 31,361 3,051
After one year through five years, amortized cost 18,826 19,947
After one year through five years, estimated fair value 19,047 20,276
Five years through ten years, amortized cost 6,513 6,489
Five years through ten years, estimated fair value 6,567 6,567
Residential Mortgage Backed Securities [Member]    
U. S. agency securities maturing:    
Amortized cost 299,709 241,120
Estimated fair value 297,241 240,320
US States and Political Subdivisions Debt Securities [Member]    
U. S. agency securities maturing:    
One year or less, amortized cost 4,450 2,410
One year or less, estimated fair value 4,478 2,438
After one year through five years, amortized cost 41,213 47,038
After one year through five years, estimated fair value 43,720 49,607
Five years through ten years, amortized cost 66,001 54,983
Five years through ten years, estimated fair value 67,398 56,927
After ten years 2,589 2,552
After ten years 2,785 2,740
Corporate Debt Securities [Member]    
U. S. agency securities maturing:    
After one year through five years, amortized cost 15,090 0
After one year through five years, estimated fair value 14,938 0
Equity Investment Other [Member]    
U. S. agency securities maturing:    
Amortized cost 307 396
Estimated fair value $ 334 $ 417