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Note 4 - Investment Securities - Investment Securities Available for Sale (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Number of investment positions - less than twelve months 67 165
Fair value - less than twelve months $ 62,680 $ 201,145
Gross unrealized losses - less than twelve months $ 590 $ 4,463
Number of investment positions - more than twelve months 126 6
Fair value - more than twelve months $ 159,337 $ 3,033
Gross unrealized losses - more than twelve months $ 3,391 $ 62
Number of investment positions 193 171
Fair value $ 222,017 $ 204,178
Gross unrealized losses $ 3,981 $ 4,525
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Number of investment positions - less than twelve months 37 78
Fair value - less than twelve months $ 37,570 $ 101,838
Gross unrealized losses - less than twelve months $ 400 $ 2,336
Number of investment positions - more than twelve months 60 1
Fair value - more than twelve months $ 74,960 $ 531
Gross unrealized losses - more than twelve months $ 1,853 $ 13
Agency Collateralized Mortgage Obligations [Member]    
Number of investment positions - less than twelve months 6 13
Fair value - less than twelve months $ 3,036 $ 11,767
Gross unrealized losses - less than twelve months $ 38 $ 239
Number of investment positions - more than twelve months 18 5
Fair value - more than twelve months $ 11,801 $ 2,502
Gross unrealized losses - more than twelve months $ 300 $ 49
US Government Agencies Debt Securities [Member]    
Number of investment positions - less than twelve months 4 20
Fair value - less than twelve months $ 11,119 $ 59,126
Gross unrealized losses - less than twelve months $ 69 $ 759
Number of investment positions - more than twelve months 19  
Fair value - more than twelve months $ 57,909  
Gross unrealized losses - more than twelve months $ 916  
Municipal Notes [Member]    
Number of investment positions - less than twelve months 20 54
Fair value - less than twelve months $ 10,955 $ 28,414
Gross unrealized losses - less than twelve months $ 83 $ 1,129
Number of investment positions - more than twelve months 29  
Fair value - more than twelve months $ 14,667  
Gross unrealized losses - more than twelve months $ 322