Investment Securities - Schedule of Present Cost or Amortized Cost and Fair Values of Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule Of Investments [Line Items]
Amortized cost	$ 695
Fair value	703
Fair value	34,798	$ 53,963
Amortized cost	36,977	54,647
Gross unrealized gains	44	94
Gross unrealized losses	(519)	(41)
Fair value	36,502	54,700
U.S. government and government agencies and authorities \| Investment securities, held-to-maturity
Schedule Of Investments [Line Items]
Amortized cost	695	694
Gross unrealized gains	21	43
Gross unrealized losses	(13)
Fair value	703	737
U.S. government and government agencies and authorities \| Investment securities, available-for-sale
Schedule Of Investments [Line Items]
Amortized cost	36,282	53,953
Gross unrealized gains	23	51
Gross unrealized losses	(506)	(41)
Fair value	$ 35,799	$ 53,963

Available for sale securities and held to maturity securities accumulated gross unrealized gain before tax.

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Available for sale securities and held to maturity securities accumulated gross unrealized loss before tax.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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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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 accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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