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Note 3 - Investment Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Securities available for sale, amortized cost, due in one year or less	$ 20,593
Securities available for sale, fair value, due in one year or less	20,703
Securities available for sale, amortized cost, due after one year through five years	68,776
Securities available for sale, fair value, due after one year through five years	70,110
Securities available for sale, amortized cost, due after five years through ten years	37,626
Securities available for sale, fair value, due after five years through ten years	39,864
Securities available for sale, amortized cost, due after ten years	66,875
Securities available for sale, fair value, due after ten years	70,436
Securities available for sale, amortized cost, due after ten years	193,870
Securities available for sale, fair value, due after ten years	201,113
Mortgage-backed securities and CMO, amortized cost	80,839
Mortgage-backed securities and CMO, fair value	82,389
Securities available for sale, amortized cost	274,709	$ 251,819
Securities available for sale, fair value	$ 283,502	$ 254,562

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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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