Investment Securities - Schedule of Amortized Cost and Fair Value of Debt Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Investments Debt And Equity Securities [Abstract]
Due after one year through five years	$ 319
Due after five years through ten years	265
Due after ten years	111
Amortized cost	695
Due after one year through five years	327
Due after five years through ten years	253
Due after ten years	123
Total	703
Due within one year	1,001
Due after one year through five years	27,222
Due after five years through ten years	8,059
Total	36,282
Due within one year	1,001
Due after one year through five years	26,990
Due after five years through ten years	7,808
Fair value	34,798	$ 53,963
Total	$ 35,799