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Note 3 - Debt Securities - Debt Securities Available-for-sale (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Due in one year or less, Amortized cost	$ 52,575
Due in one year or less, Estimated fair value	53,012
Due after one year through five years, Amortized cost	421,355
Due after one year through five years, Estimated fair value	422,429
Due after five years through ten years, Amortized cost	328,324
Due after five years through ten years, Estimated fair value	330,727
Due after ten years, Amortized cost	24,931
Due after ten years, Estimated fair value	24,835
Total, amortized cost	827,185	$ 575,636
Securities available-for-sale	$ 831,003	$ 596,999

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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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