Annual report pursuant to Section 13 and 15(d)

Note 3 - Debt Securities - Investment Securities Continuous Unrealized Loss Position (Details)

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Note 3 - Debt Securities - Investment Securities Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Less Than Twelve Months, Gross Unrealized Losses $ (1,622) $ (4,252)
Less Than Twelve Months, Fair Value 247,425 252,626
Twelve Months or More, Gross Unrealized Losses (1,900) (8)
Twelve Months or More, Fair Value 85,477 1,021
Total, Gross Unrealized Losses (3,522) (4,260)
Total, Fair Value 332,902 253,647
US Treasury and Government [Member]    
Less Than Twelve Months, Gross Unrealized Losses (151) (126)
Less Than Twelve Months, Fair Value 33,401 10,865
Twelve Months or More, Gross Unrealized Losses (98)
Twelve Months or More, Fair Value 2,926
Total, Gross Unrealized Losses (249) (126)
Total, Fair Value 36,327 10,865
Collateralized Mortgage Backed Securities [Member]    
Less Than Twelve Months, Gross Unrealized Losses (986) (3,413)
Less Than Twelve Months, Fair Value 140,432 174,225
Twelve Months or More, Gross Unrealized Losses (1,699)
Twelve Months or More, Fair Value 75,903
Total, Gross Unrealized Losses (2,685) (3,413)
Total, Fair Value 216,335 174,225
US States and Political Subdivisions Debt Securities [Member]    
Less Than Twelve Months, Gross Unrealized Losses (450) (698)
Less Than Twelve Months, Fair Value 66,637 64,502
Twelve Months or More, Gross Unrealized Losses (103) (8)
Twelve Months or More, Fair Value 6,648 1,021
Total, Gross Unrealized Losses (553) (706)
Total, Fair Value 73,285 65,523
Corporate Debt Securities [Member]    
Less Than Twelve Months, Gross Unrealized Losses (35) (15)
Less Than Twelve Months, Fair Value 6,955 3,034
Twelve Months or More, Gross Unrealized Losses
Twelve Months or More, Fair Value
Total, Gross Unrealized Losses (35) (15)
Total, Fair Value $ 6,955 $ 3,034