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
Mar. 31, 2017
Dec. 31, 2016
Less Than Twelve Months, Gross Unrealized Losses $ (2,809) $ (4,252)
Less Than Twelve Months, Fair Value 235,706 252,626
Twelve Months or More, Gross Unrealized Losses (11) (8)
Twelve Months or More, Fair Value 1,412 1,021
Total, Gross Unrealized Losses (2,820) (4,260)
Total, Fair Value 237,118 253,647
US Treasury and Government [Member]    
Less Than Twelve Months, Gross Unrealized Losses (106) (126)
Less Than Twelve Months, Fair Value 7,902 10,865
Twelve Months or More, Gross Unrealized Losses
Twelve Months or More, Fair Value
Total, Gross Unrealized Losses (106) (126)
Total, Fair Value 7,902 10,865
Collateralized Mortgage Backed Securities [Member]    
Less Than Twelve Months, Gross Unrealized Losses (2,424) (3,413)
Less Than Twelve Months, Fair Value 188,130 174,225
Twelve Months or More, Gross Unrealized Losses
Twelve Months or More, Fair Value
Total, Gross Unrealized Losses (2,424) (3,413)
Total, Fair Value 188,130 174,225
US States and Political Subdivisions Debt Securities [Member]    
Less Than Twelve Months, Gross Unrealized Losses (263) (698)
Less Than Twelve Months, Fair Value 36,644 64,502
Twelve Months or More, Gross Unrealized Losses (11) (8)
Twelve Months or More, Fair Value 1,412 1,021
Total, Gross Unrealized Losses (274) (706)
Total, Fair Value 38,056 65,523
Corporate Debt Securities [Member]    
Less Than Twelve Months, Gross Unrealized Losses (16) (15)
Less Than Twelve Months, Fair Value 3,030 3,034
Twelve Months or More, Gross Unrealized Losses
Twelve Months or More, Fair Value
Total, Gross Unrealized Losses (16) (15)
Total, Fair Value $ 3,030 $ 3,034