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Investment in Securities (Schedule of Amortized Cost and Fair Value of Investment Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Due in 1 year or less	$ 13,741
Amortized Cost, Due after 1 year through 5 years	121,838
Amortized Cost, Due after 5 years through 10 years	232,821
Amortized Cost, Due after 10 years	82,881
Amortized Cost, Total	451,281
Fair Value, Due in 1 year or less	13,782
Fair Value, Due after 1 year through 5 years	121,626
Fair Value, Due after 5 years through 10 years	231,333
Fair Value, Due after 10 years	79,699
Fair Value, Total	$ 446,440	$ 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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