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Investment in Securities (Schedule of Amortized Cost and Fair Value of Investment Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Due in 1 year or less	$ 70,415
Amortized Cost, Due after 1 year through 5 years	89,351
Amortized Cost, Due after 5 years through 10 years	161,771
Amortized Cost, Due after 10 years	90,291
Amortized Cost, Total	411,828
Fair Value, Due in 1 year or less	70,697
Fair Value, Due after 1 year through 5 years	93,669
Fair Value, Due after 5 years through 10 years	173,009
Fair Value, Due after 10 years	89,869
Fair Value, Total	$ 427,244	$ 357,726

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- Definition

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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