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Securities - Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Amortized Cost
Less than one year	$ 97,822
Due after one year through five years	195,949
Due after five years through ten years	93,596
Due after ten years	103,307
Total investment securities	490,674
Estimated Fair Value
Less than one year	98,394
Due after one year through five years	201,798
Due after five years through ten years	92,120
Due after ten years	111,740
Total investment securities	$ 504,052

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