Investments, Gross Unrealized Losses and Fair Value and Net Unrealized Gains (Losses) (Details) $ in Thousands	Mar. 31, 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	268
Less than twelve months, Fair value	$ 322,280	$ 211,396
Twelve months or greater, Fair value	34,671	18,416
Total, Fair value	356,951	229,812
Less than twelve months, Gross unrealized losses	(17,862)	(3,261)
Twelve months or greater, Gross unrealized losses	(3,605)	(736)
Total, Gross Unrealized Losses	(21,467)	(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	36,781	26,754
Twelve months or greater, Fair value	11,106	7,542
Total, Fair value	47,887	34,296
Less than twelve months, Gross unrealized losses	(1,989)	(387)
Twelve months or greater, Gross unrealized losses	(1,376)	(447)
Total, Gross Unrealized Losses	(3,365)	(834)
U.S. Treasury Securities [Member]
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than twelve months, Fair value	130,927	106,794
Twelve months or greater, Fair value	2,036	0
Total, Fair value	132,963	106,794
Less than twelve months, Gross unrealized losses	(7,187)	(1,459)
Twelve months or greater, Gross unrealized losses	(128)	0
Total, Gross Unrealized Losses	(7,315)	(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	79,321	10,744
Twelve months or greater, Fair value	2,674	2,899
Total, Fair value	81,995	13,643
Less than twelve months, Gross unrealized losses	(3,786)	(26)
Twelve months or greater, Gross unrealized losses	(243)	(26)
Total, Gross Unrealized Losses	(4,029)	(52)
Corporate Obligations [Member]
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract]
Less than twelve months, Fair value	8,311	6,922
Twelve months or greater, Fair value	483	0
Total, Fair value	8,794	6,922
Less than twelve months, Gross unrealized losses	(306)	(84)
Twelve months or greater, Gross unrealized losses	(17)	0
Total, Gross Unrealized Losses	(323)	(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	66,940	60,182
Twelve months or greater, Fair value	18,372	7,975
Total, Fair value	85,312	68,157
Less than twelve months, Gross unrealized losses	(4,594)	(1,305)
Twelve months or greater, Gross unrealized losses	(1,841)	(263)
Total, Gross Unrealized Losses	$ (6,435)	$ (1,568)