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Investment in Securities (Schedule of Amortized Cost and Fair Value of Investment Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Investments, Debt and Equity Securities [Abstract] |  |
Amortized Cost, Due in 1 year or less | $ 51,219 |
Amortized Cost, Due after 1 year through 5 years | 97,799 |
Amortized Cost, Due after 5 years through 10 years | 222,143 |
Amortized Cost, Due after 10 years | 37,439 |
Amortized Cost, No stated maturity |  |
Amortized Cost, Total | 408,600 |
Fair Value, Due in 1 year or less | 51,485 |
Fair Value, Due after 1 year through 5 years | 100,179 |
Fair Value, Due after 5 years through 10 years | 233,289 |
Fair Value, Due after 10 years | 37,712 |
Fair Value, No stated maturity |  |
Available-for-sale Securities, Total | $ 422,665 | $ 441,534

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