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Investment Securities and Certificates of Deposit - Scheduled Maturities of Available-for-Sale Debt Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Investments, Debt and Equity Securities [Abstract] |  |
Due within one year, amortized cost | $ 4,951 | $ 108,662
Due after one year through five years, amortized cost | 7,100 | 5,542
Due after ten years, amortized cost | 1,009 | 0
Debt Securities, Available-for-sale, Amortized Cost | 13,060 | 114,204
Due within one year, fair value | 4,981 | 109,217
Due after one year through five years, fair value | 7,130 | 5,567
Due after ten years, fair value | 1,008 | 0
Total, fair value | $ 13,119 | $ 114,784

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