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Note 3 - Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Amortized cost, due in one year or less, available for sale securities	$ 4,002
Fair value, due in one year or less, available for sale securities	4,048
Amortized cost, due after one year through five years, available for sale securities	5,605
Fair value, due after one year through five years, available for sale securities	5,787
Amortized cost, due after five years through ten years, available for sale securities	141,804
Fair value, due after five years through ten years, available for sale securities	146,716
Amortized cost, due after ten years, available for sale securities	378,664
Fair value, due after ten years, available for sale securities	390,191
Amortized cost, total securities available for sale	530,075	$ 435,166
Fair value, total securities available for sale	$ 546,742	$ 435,263

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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