Investment in Securities (Schedule of Amortized Cost and Fair Value of Investment Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Due in 1 year or less	$ 58,144
Amortized Cost, Due after 1 year through 5 years	95,443
Amortized Cost, Due after 5 years through 10 years	216,180
Amortized Cost, Due after 10 years	120,295
Amortized Cost, Total	490,062
Fair Value, Due in 1 year or less	58,412
Fair Value, Due after 1 year through 5 years	100,135
Fair Value, Due after 5 years through 10 years	227,682
Fair Value, Due after 10 years	120,818
Fair Value, Total	$ 507,047	$ 357,726

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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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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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), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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