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
Jun. 30, 2018
Dec. 31, 2017
Less Than Twelve Months, Gross Unrealized Losses $ (7,332) $ (1,622)
Less Than Twelve Months, Fair Value 388,376 247,425
Twelve Months or More, Gross Unrealized Losses (3,454) (1,900)
Twelve Months or More, Fair Value 78,113 85,477
Total, Gross Unrealized Losses (10,786) (3,522)
Total, Fair Value 466,489 332,902
US Treasury and Government [Member]    
Less Than Twelve Months, Gross Unrealized Losses (809) (151)
Less Than Twelve Months, Fair Value 54,065 33,401
Twelve Months or More, Gross Unrealized Losses (156) (98)
Twelve Months or More, Fair Value 2,866 2,926
Total, Gross Unrealized Losses (965) (249)
Total, Fair Value 56,931 36,327
Collateralized Mortgage Backed Securities [Member]    
Less Than Twelve Months, Gross Unrealized Losses (5,255) (986)
Less Than Twelve Months, Fair Value 228,217 140,432
Twelve Months or More, Gross Unrealized Losses (3,135) (1,699)
Twelve Months or More, Fair Value 67,375 75,903
Total, Gross Unrealized Losses (8,390) (2,685)
Total, Fair Value 295,592 216,335
US States and Political Subdivisions Debt Securities [Member]    
Less Than Twelve Months, Gross Unrealized Losses (602) (450)
Less Than Twelve Months, Fair Value 66,356 66,637
Twelve Months or More, Gross Unrealized Losses (163) (103)
Twelve Months or More, Fair Value 7,872 6,648
Total, Gross Unrealized Losses (765) (553)
Total, Fair Value 74,228 73,285
Corporate Debt Securities [Member]    
Less Than Twelve Months, Gross Unrealized Losses (666) (35)
Less Than Twelve Months, Fair Value 39,738 6,955
Twelve Months or More, Gross Unrealized Losses
Twelve Months or More, Fair Value
Total, Gross Unrealized Losses (666) (35)
Total, Fair Value $ 39,738 $ 6,955