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Note 4 - Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Amortized cost, due in one year or less, available for sale securities	$ 3,072
Fair value, due in one year or less, available for sale securities	3,115
Amortized cost, due after one year through five years, available for sale securities	5,438
Fair value, due after one year through five years, available for sale securities	5,573
Amortized cost, due after five years through ten years, available for sale securities	178,874
Fair value, due after five years through ten years, available for sale securities	179,196
Amortized cost, due after ten years, available for sale securities	382,893
Fair value, due after ten years, available for sale securities	383,475
Amortized cost, total securities available for sale	570,277	$ 530,075
Fair value, total securities available for sale	$ 571,359	$ 546,742

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