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Securities - Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity (Details) $ in Thousands	Sep. 30, 2020 USD ($)
Amortized Cost
Less than one year, amortized cost	$ 95,990
Due after one year through five years, amortized cost	180,827
Due after five years through ten years, amortized cost	78,064
Due after ten years, amortized cost	102,950
Total amortized cost	457,831
Estimated Fair Value
Less than one year, estimated fair value	96,765
Due after one year through five years, estimated fair value	186,965
Due after five years through ten years, estimated fair value	75,630
Due after ten years, estimated fair value	109,180
Total estimated fair value	$ 468,540

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