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Note 6 - Debt Securities - Debt Securities Available-for-sale (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Due in one year or less, Amortized cost	$ 36,141
Due in one year or less, Estimated fair value	36,012
Due after one year through five years, Amortized cost	456,498
Due after one year through five years, Estimated fair value	430,508
Due after five years through ten years, Amortized cost	383,933
Due after five years through ten years, Estimated fair value	346,032
Due after ten years, Amortized cost	17,853
Due after ten years, Estimated fair value	15,837
Total, amortized cost	894,425	$ 827,185
Securities available-for-sale	$ 828,389	$ 831,003

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