Available-for-Sale Securities - Summary of Maturities of Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	$ 14,336	$ 21,535
Available-for-sale securities, at fair value (Note 4)	14,512	21,504
Corporate Bonds
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale Securities After one year through five years, Amortized Cost	2,647
Available-for-Sale Securities more than five years, Amortized Cost	7,475
Available-for-Sale Securities, Amortized Cost	10,122
Available-for-Sale Securities After one year through five years, Fair Value	2,736
Available-for-Sale Securities more than five years, Fair Value	7,497
Available-for-sale securities, at fair value (Note 4)	10,233
Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	4,214	5,162
Available-for-sale securities, at fair value (Note 4)	$ 4,279	5,150
U.S. Government and Federal Agencies
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale Securities Three months or less, Amortized Cost		2,000
Available-for-Sale Securities After three months through one year, Amortized Cost		14,373
Available-for-Sale Securities, Amortized Cost		16,373
Available-for-Sale Securities Three months or less, Fair Value		2,000
Available-for-Sale Securities After three months through one year, Fair Value		14,354
Available-for-sale securities, at fair value (Note 4)		$ 16,354

Accrued interest payable fair value.

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Available-for-sale securities, debt maturities, after three month through one years amortized cost.

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Available-for-sale Securities, debt maturities, after three month through one years fair value.

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Available for sale securities debt maturities more than five years fair value.

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Available-for-sale securities, debt maturities three month or less amortized cost.

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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).

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Amount 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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