Investment in Securities - Schedule of Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Amortized Cost
Due in 1 year or less	$ 25,511
Due after 1 year through 5 years	104,620
Due after 5 years through 10 years	210,353
Due after 10 years	188,047
Amortized Cost	528,531	$ 338,047
Fair Value
Due in 1 year or less	25,760
Due after 1 year through 5 years	109,737
Due after 5 years through 10 years	219,204
Due after 10 years	186,378
Total	$ 541,079	$ 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), 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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