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Securities - Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Amortized Cost
Less than one year, Amortized Cost	$ 82,453
Due after one year through five years, Amortized Cost	199,795
Due after five years through ten years, Amortized Cost	77,653
Due after ten years, Amortized Cost	110,067
Total Amortized Cost	469,968
Estimated Fair Value
Less than one year, Estimated Fair Value	82,780
Due after one year through five years, Estimated Fair Value	204,837
Due after five years through ten years, Estimated Fair Value	70,576
Due after ten years, Estimated Fair Value	110,407
Total Estimated Fair Value	$ 468,600

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