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Note 4 - Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Amortized cost, due in one year or less, available for sale securities	$ 77,356
Fair value, due in one year or less, available for sale securities	77,289
Amortized cost, due after one year through five years, available for sale securities	192,591
Fair value, due after one year through five years, available for sale securities	187,972
Amortized cost, due after five years through ten years, available for sale securities	104,328
Fair value, due after five years through ten years, available for sale securities	102,373
Amortized cost, due after ten years, available for sale securities	100,888
Fair value, due after ten years, available for sale securities	99,871
Amortized cost, total securities available for sale	475,163	$ 336,075
Fair value, total securities available for sale	$ 467,505	$ 331,387

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