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, 2018
Dec. 31, 2017
Less Than Twelve Months, Gross Unrealized Losses $ (5,867) $ (1,622)
Less Than Twelve Months, Fair Value 339,042 247,425
Twelve Months or More, Gross Unrealized Losses (7,457) (1,900)
Twelve Months or More, Fair Value 176,153 85,477
Total, Gross Unrealized Losses (13,324) (3,522)
Total, Fair Value 515,195 332,902
US Treasury and Government [Member]    
Less Than Twelve Months, Gross Unrealized Losses (736) (151)
Less Than Twelve Months, Fair Value 62,833 33,401
Twelve Months or More, Gross Unrealized Losses (465) (98)
Twelve Months or More, Fair Value 11,311 2,926
Total, Gross Unrealized Losses (1,201) (249)
Total, Fair Value 74,144 36,327
Collateralized Mortgage Backed Securities [Member]    
Less Than Twelve Months, Gross Unrealized Losses (3,566) (986)
Less Than Twelve Months, Fair Value 141,107 140,432
Twelve Months or More, Gross Unrealized Losses (6,456) (1,699)
Twelve Months or More, Fair Value 144,336 75,903
Total, Gross Unrealized Losses (10,022) (2,685)
Total, Fair Value 285,443 216,335
US States and Political Subdivisions Debt Securities [Member]    
Less Than Twelve Months, Gross Unrealized Losses (613) (450)
Less Than Twelve Months, Fair Value 69,646 66,637
Twelve Months or More, Gross Unrealized Losses (536) (103)
Twelve Months or More, Fair Value 20,506 6,648
Total, Gross Unrealized Losses (1,149) (553)
Total, Fair Value 90,152 73,285
Corporate Debt Securities [Member]    
Less Than Twelve Months, Gross Unrealized Losses (952) (35)
Less Than Twelve Months, Fair Value 65,456 6,955
Twelve Months or More, Gross Unrealized Losses
Twelve Months or More, Fair Value
Total, Gross Unrealized Losses (952) (35)
Total, Fair Value $ 65,456 $ 6,955