Investments, Gross Unrealized Losses and Fair Value and Net Unrealized Gains (Losses) (Details) $ in Thousands	Sep. 30, 2022 USD ($) Security	Dec. 31, 2021 USD ($)
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract]
Number of securities owned with fair value less than cost | Security	343
Less than twelve months, Fair value	$ 257,365	$ 211,396
Twelve months or greater, Fair value	170,488	18,416
Total, Fair value	427,853	229,812
Less than twelve months, Gross unrealized losses	(22,044)	(3,261)
Twelve months or greater, Gross unrealized losses	(28,175)	(736)
Total, Gross Unrealized Losses	(50,219)	(3,997)
U.S. Agency Securities [Member]
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than twelve months, Fair value	48,992	26,754
Twelve months or greater, Fair value	24,990	7,542
Total, Fair value	73,982	34,296
Less than twelve months, Gross unrealized losses	(2,443)	(387)
Twelve months or greater, Gross unrealized losses	(5,121)	(447)
Total, Gross Unrealized Losses	(7,564)	(834)
U.S. Treasury Securities [Member]
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than twelve months, Fair value	65,232	106,794
Twelve months or greater, Fair value	82,612	0
Total, Fair value	147,844	106,794
Less than twelve months, Gross unrealized losses	(3,667)	(1,459)
Twelve months or greater, Gross unrealized losses	(10,661)	0
Total, Gross Unrealized Losses	(14,328)	(1,459)
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	94,880	10,744
Twelve months or greater, Fair value	8,892	2,899
Total, Fair value	103,772	13,643
Less than twelve months, Gross unrealized losses	(11,086)	(26)
Twelve months or greater, Gross unrealized losses	(1,704)	(26)
Total, Gross Unrealized Losses	(12,790)	(52)
Corporate Obligations [Member]
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than twelve months, Fair value	4,474	6,922
Twelve months or greater, Fair value	3,964	0
Total, Fair value	8,438	6,922
Less than twelve months, Gross unrealized losses	(372)	(84)
Twelve months or greater, Gross unrealized losses	(536)	0
Total, Gross Unrealized Losses	(908)	(84)
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	43,787	60,182
Twelve months or greater, Fair value	50,030	7,975
Total, Fair value	93,817	68,157
Less than twelve months, Gross unrealized losses	(4,476)	(1,305)
Twelve months or greater, Gross unrealized losses	(10,153)	(263)
Total, Gross Unrealized Losses	$ (14,629)	$ (1,568)