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, 2018
Dec. 31, 2017
Less Than Twelve Months, Gross Unrealized Losses $ (5,906) $ (1,622)
Less Than Twelve Months, Fair Value 345,327 247,425
Twelve Months or More, Gross Unrealized Losses (3,110) (1,900)
Twelve Months or More, Fair Value 80,565 85,477
Total, Gross Unrealized Losses (9,016) (3,522)
Total, Fair Value 425,892 332,902
US Treasury and Government [Member]    
Less Than Twelve Months, Gross Unrealized Losses (635) (151)
Less Than Twelve Months, Fair Value 54,191 33,401
Twelve Months or More, Gross Unrealized Losses (142) (98)
Twelve Months or More, Fair Value 2,881 2,926
Total, Gross Unrealized Losses (777) (249)
Total, Fair Value 57,072 36,327
Collateralized Mortgage Backed Securities [Member]    
Less Than Twelve Months, Gross Unrealized Losses (4,046) (986)
Less Than Twelve Months, Fair Value 200,071 140,432
Twelve Months or More, Gross Unrealized Losses (2,828) (1,699)
Twelve Months or More, Fair Value 71,042 75,903
Total, Gross Unrealized Losses (6,874) (2,685)
Total, Fair Value 271,113 216,335
US States and Political Subdivisions Debt Securities [Member]    
Less Than Twelve Months, Gross Unrealized Losses (716) (450)
Less Than Twelve Months, Fair Value 64,676 66,637
Twelve Months or More, Gross Unrealized Losses (140) (103)
Twelve Months or More, Fair Value 6,642 6,648
Total, Gross Unrealized Losses (856) (553)
Total, Fair Value 71,318 73,285
Corporate Debt Securities [Member]    
Less Than Twelve Months, Gross Unrealized Losses (509) (35)
Less Than Twelve Months, Fair Value 26,389 6,955
Twelve Months or More, Gross Unrealized Losses
Twelve Months or More, Fair Value
Total, Gross Unrealized Losses (509) (35)
Total, Fair Value $ 26,389 $ 6,955