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Investment in Securities (Schedule of Amortized Cost and Fair Value of Investment Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Due in 1 year or less	$ 17,585
Amortized Cost, Due after 1 year through 5 years	123,001
Amortized Cost, Due after 5 years through 10 years	241,321
Amortized Cost, Due after 10 years	51,500
Amortized Cost, Total	433,407
Fair Value, Due in 1 year or less	17,607
Fair Value, Due after 1 year through 5 years	124,343
Fair Value, Due after 5 years through 10 years	248,393
Fair Value, Due after 10 years	50,846
Fair Value, Total	$ 441,189	$ 441,534

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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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