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Note 3 - Investment Securities Available-for-Sale (Details) - Securities Available-for-sale by Contractual Maturity - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
U. S. Government agency securities maturing:    
Residential mortgage backed securities, amortized cost $ 518,807 $ 377,933
Residential mortgage backed securities, estimated fair value 524,326 382,343
US Government Agencies Debt Securities [Member]    
U. S. Government agency securities maturing:    
One year or less, amortized cost 44,981 2,998
One year or less, estimated fair value 45,138 3,051
After one year through five years, amortized cost 18,812 19,947
After one year through five years, estimated fair value 19,259 20,276
Five years through ten years, amortized cost 4,496 6,489
Five years through ten years, estimated fair value 4,681 6,567
Residential Mortgage Backed Securities [Member]    
U. S. Government agency securities maturing:    
Residential mortgage backed securities, amortized cost 320,978 241,120
Residential mortgage backed securities, estimated fair value 322,020 240,320
US States and Political Subdivisions Debt Securities [Member]    
U. S. Government agency securities maturing:    
One year or less, amortized cost 4,978 2,410
One year or less, estimated fair value 5,024 2,438
After one year through five years, amortized cost 40,040 47,038
After one year through five years, estimated fair value 42,600 49,607
Five years through ten years, amortized cost 66,539 54,983
Five years through ten years, estimated fair value 67,456 56,927
After ten years 2,580 2,552
After ten years 2,786 2,740
Corporate Debt Securities [Member]    
U. S. Government agency securities maturing:    
After one year through five years, amortized cost 15,096  
After one year through five years, estimated fair value 15,018  
Equity Investment Other [Member]    
U. S. Government agency securities maturing:    
Residential mortgage backed securities, amortized cost 307 396
Residential mortgage backed securities, estimated fair value $ 344 $ 417