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Note 3 - Investment Securities Available-for-Sale (Details) - Securities Available-for-sale by Contractual Maturity - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
U. S. Government agency securities maturing:    
Residential mortgage backed securities, amortized cost $ 421,645 $ 377,933
Residential mortgage backed securities, estimated fair value 423,709 382,343
US Government Agencies Debt Securities [Member]    
U. S. Government agency securities maturing:    
One year or less, amortized cost 30,957 2,998
One year or less, estimated fair value 30,813 3,051
After one year through five years, amortized cost 21,905 19,947
After one year through five years, estimated fair value 22,266 20,276
Five years through ten years, amortized cost 6,498 6,489
Five years through ten years, estimated fair value 6,624 6,567
Residential Mortgage Backed Securities [Member]    
U. S. Government agency securities maturing:    
Residential mortgage backed securities, amortized cost 256,196 241,120
Residential mortgage backed securities, estimated fair value 255,663 240,320
US States and Political Subdivisions Debt Securities [Member]    
U. S. Government agency securities maturing:    
One year or less, amortized cost 1,530 2,410
One year or less, estimated fair value 1,534 2,438
After one year through five years, amortized cost 39,733 47,038
After one year through five years, estimated fair value 41,838 49,607
Five years through ten years, amortized cost 44,028 54,983
Five years through ten years, estimated fair value 44,081 56,927
After ten years 5,302 2,552
After ten years 5,385 2,740
Corporate Debt Securities [Member]    
U. S. Government agency securities maturing:    
After one year through five years, amortized cost 15,100  
After one year through five years, estimated fair value 15,041  
Equity Investment Other [Member]    
U. S. Government agency securities maturing:    
Residential mortgage backed securities, amortized cost 396 396
Residential mortgage backed securities, estimated fair value $ 464 $ 417