Investments, Gross Unrealized Losses and Fair Value and Net Unrealized Gains (Losses) (Details) $ in Thousands	Sep. 30, 2021 USD ($) Security	Dec. 31, 2020 USD ($)
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than twelve months, Fair value	$ 136,462	$ 33,727
Twelve months or greater, Fair value	11,879	5,633
Total, Fair value	148,341	39,360
Less than twelve months, Gross unrealized losses	(1,372)	(206)
Twelve months or greater, Gross unrealized losses	(250)	(38)
Total, Gross Unrealized Losses	$ (1,622)	(244)
Number of securities owned with fair value less than cost | Security	96
U.S. Agency Securities [Member]
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than twelve months, Fair value	$ 9,391	13,720
Twelve months or greater, Fair value	4,776	0
Total, Fair value	14,167	13,720
Less than twelve months, Gross unrealized losses	(172)	(52)
Twelve months or greater, Gross unrealized losses	(212)	0
Total, Gross Unrealized Losses	(384)	(52)
U.S. Treasury Securities [Member]
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than twelve months, Fair value	67,806
Twelve months or greater, Fair value	0
Total, Fair value	67,806
Less than twelve months, Gross unrealized losses	(347)
Twelve months or greater, Gross unrealized losses	0
Total, Gross Unrealized Losses	(347)
Obligations of State and Political Subdivisions [Member]
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than twelve months, Fair value	13,289	5,407
Twelve months or greater, Fair value	1,887	0
Total, Fair value	15,176	5,407
Less than twelve months, Gross unrealized losses	(49)	(55)
Twelve months or greater, Gross unrealized losses	(26)	0
Total, Gross Unrealized Losses	(75)	(55)
Corporate Obligations [Member]
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than twelve months, Fair value	4,485
Twelve months or greater, Fair value	0
Total, Fair value	4,485
Less than twelve months, Gross unrealized losses	(15)
Twelve months or greater, Gross unrealized losses	0
Total, Gross Unrealized Losses	(15)
Mortgage-backed Securities in Government Sponsored Entities [Member]
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than twelve months, Fair value	41,491	14,600
Twelve months or greater, Fair value	5,216	5,633
Total, Fair value	46,707	20,233
Less than twelve months, Gross unrealized losses	(789)	(99)
Twelve months or greater, Gross unrealized losses	(12)	(38)
Total, Gross Unrealized Losses	$ (801)	$ (137)