Investment in Securities (Schedule of Amortized Cost and Fair Value of Investment Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
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

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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