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Note 4 - Investment Securities (Details) - Investment Securities Available for Sale
$ in Thousands
Dec. 31, 2015
USD ($)
Continuous loss position less than twelve months:  
Number of Investment Positions 64
Fair Value $ 113,001
Gross Unrealized Losses $ 620
Number of Investment Positions 16
Fair Value $ 9,698
Gross Unrealized Losses $ 167
Total securities available for sale 80
Total securities available for sale $ 122,699
Total securities available for sale $ 787
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]  
Continuous loss position less than twelve months:  
Number of Investment Positions 33
Fair Value $ 30,602
Gross Unrealized Losses $ 229
Number of Investment Positions 4
Fair Value $ 2,284
Gross Unrealized Losses $ 42
Agency Collateralized Mortgage Obligations [Member]  
Continuous loss position less than twelve months:  
Number of Investment Positions 3
Fair Value $ 514
Gross Unrealized Losses $ 2
Number of Investment Positions 9
Fair Value $ 5,860
Gross Unrealized Losses $ 99
US Government Agencies Debt Securities [Member]  
Continuous loss position less than twelve months:  
Number of Investment Positions 24
Fair Value $ 78,692
Gross Unrealized Losses $ 355
Municipal Notes [Member]  
Continuous loss position less than twelve months:  
Number of Investment Positions 4
Fair Value $ 3,193
Gross Unrealized Losses $ 34
Number of Investment Positions 3
Fair Value $ 1,554
Gross Unrealized Losses $ 26