Investments, Amortized Cost and Estimated Market Value of Debt Securities (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Securities Held-to-Maturity, Amortized Cost [Abstract]
Due in one year or less	$ 0
Due after one year through five years	0
Due after five years through ten years	1,462
Due after ten years	9,524
Amortized cost	10,986		$ 11,423
Securities Held-to-Maturity, Estimated Fair Value [Abstract]
Due in one year or less	0
Due after one year through five years	0
Due after five years through ten years	1,402
Due after ten years	8,861
Estimated fair value	10,263
Sale of investment securities	$ 0	$ 0

Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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