Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Securities - Investment Securities Continuous Unrealized Loss Position (Details)

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Note 4 - Securities - Investment Securities Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Less Than Twelve Months, Gross Unrealized Losses $ (747) $ (4,252)
Less Than Twelve Months, Fair Value 109,292 252,626
Twelve Months or More, Gross Unrealized Losses (812) (8)
Twelve Months or More, Fair Value 50,762 1,021
Total, Gross Unrealized Losses (1,559) (4,260)
Total, Fair Value 160,054 253,647
US Treasury and Government [Member]    
Less Than Twelve Months, Gross Unrealized Losses (75) (126)
Less Than Twelve Months, Fair Value 9,670 10,865
Twelve Months or More, Gross Unrealized Losses
Twelve Months or More, Fair Value
Total, Gross Unrealized Losses (75) (126)
Total, Fair Value 9,670 10,865
Collateralized Mortgage Backed Securities [Member]    
Less Than Twelve Months, Gross Unrealized Losses (596) (3,413)
Less Than Twelve Months, Fair Value 77,553 174,225
Twelve Months or More, Gross Unrealized Losses (762)
Twelve Months or More, Fair Value 43,721
Total, Gross Unrealized Losses (1,358) (3,413)
Total, Fair Value 121,274 174,225
US States and Political Subdivisions Debt Securities [Member]    
Less Than Twelve Months, Gross Unrealized Losses (76) (698)
Less Than Twelve Months, Fair Value 22,069 64,502
Twelve Months or More, Gross Unrealized Losses (50) (8)
Twelve Months or More, Fair Value 7,041 1,021
Total, Gross Unrealized Losses (126) (706)
Total, Fair Value $ 29,110 65,523
Corporate Debt Securities [Member]    
Less Than Twelve Months, Gross Unrealized Losses   (15)
Less Than Twelve Months, Fair Value   3,034
Twelve Months or More, Gross Unrealized Losses  
Twelve Months or More, Fair Value  
Total, Gross Unrealized Losses   (15)
Total, Fair Value   $ 3,034