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Investment in Securities (Schedule of Amortized Cost and Fair Value of Investment Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Due in 1 year or less	$ 16,570
Amortized Cost, Due after 1 year through 5 years	102,182
Amortized Cost, Due after 5 years through 10 years	216,399
Amortized Cost, Due after 10 years	107,717
Amortized Cost, Total	442,868
Fair Value, Due in 1 year or less	16,678
Fair Value, Due after 1 year through 5 years	102,497
Fair Value, Due after 5 years through 10 years	217,126
Fair Value, Due after 10 years	104,562
Fair Value, Total	$ 440,863	$ 470,523

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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