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Investment in Securities (Schedule of Amortized Cost and Fair Value of Investment Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Due in 1 year or less	$ 7,956
Amortized Cost, Due after 1 year through 5 years	125,746
Amortized Cost, Due after 5 years through 10 years	242,119
Amortized Cost, Due after 10 years	65,059
Amortized Cost, No stated maturity
Amortized Cost, Total	440,880
Fair Value, Due in 1 year or less	7,987
Fair Value, Due after 1 year through 5 years	126,252
Fair Value, Due after 5 years through 10 years	244,118
Fair Value, Due after 10 years	63,177
Fair Value, No stated maturity
Available-for-sale Securities, Total	$ 441,534	$ 470,523

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