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2. Investment securities (Details 2) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Amortized Cost
Due within one year	$ 15,906
Due from one to five years	10,216
Due from five to ten years	87,596
Due after ten years	24,367
Mortgage-backed securities	184,445
Total	322,530	$ 238,236
Estimated Fair Value
Due within one year	16,126
Due from one to five years	10,785
Due from five to ten years	89,027
Due after ten years	23,876
Mortgage-backed securities	185,703
Total	$ 325,517

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