Investments, Gross Unrealized Losses and Fair Value and Net Unrealized Gains (Losses) (Details) $ in Thousands	Mar. 31, 2023 USD ($) Security	Dec. 31, 2022 USD ($)
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract]
Number of securities owned with fair value less than cost | Security	340
Less than twelve months, Fair value	$ 52,164	$ 181,562
Twelve months or greater, Fair value	376,351	246,164
Total, Fair value	428,515	427,726
Less than twelve months, Gross unrealized losses	(901)	(11,648)
Twelve months or greater, Gross unrealized losses	(37,686)	(35,889)
Total, Gross Unrealized Losses	(38,587)	(47,537)
U.S. Agency Securities [Member]
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than twelve months, Fair value	23,681	39,729
Twelve months or greater, Fair value	47,167	30,948
Total, Fair value	70,848	70,677
Less than twelve months, Gross unrealized losses	(388)	(1,892)
Twelve months or greater, Gross unrealized losses	(5,823)	(5,987)
Total, Gross Unrealized Losses	(6,211)	(7,879)
U.S. Treasury Securities [Member]
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than twelve months, Fair value	4,503	32,673
Twelve months or greater, Fair value	147,207	115,897
Total, Fair value	151,710	148,570
Less than twelve months, Gross unrealized losses	(112)	(1,337)
Twelve months or greater, Gross unrealized losses	(10,478)	(12,329)
Total, Gross Unrealized Losses	(10,590)	(13,666)
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	11,731	66,725
Twelve months or greater, Fair value	87,625	35,782
Total, Fair value	99,356	102,507
Less than twelve months, Gross unrealized losses	(189)	(4,887)
Twelve months or greater, Gross unrealized losses	(8,467)	(5,410)
Total, Gross Unrealized Losses	(8,656)	(10,297)
Corporate Obligations [Member]
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than twelve months, Fair value	1,241	2,165
Twelve months or greater, Fair value	8,111	6,218
Total, Fair value	9,352	8,383
Less than twelve months, Gross unrealized losses	(9)	(165)
Twelve months or greater, Gross unrealized losses	(963)	(787)
Total, Gross Unrealized Losses	(972)	(952)
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	11,008	40,270
Twelve months or greater, Fair value	86,241	57,319
Total, Fair value	97,249	97,589
Less than twelve months, Gross unrealized losses	(203)	(3,367)
Twelve months or greater, Gross unrealized losses	(11,955)	(11,376)
Total, Gross Unrealized Losses	$ (12,158)	$ (14,743)