Investments, Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Investment (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Debt Securities [Abstract]
Amortized cost	$ 481,924	$ 486,993
Gross unrealized gains	78	50
Gross unrealized losses	(38,587)	(47,537)
Allowance for credit losses	0	0
Fair value	443,415	439,506
U.S. Agency Securities [Member]
Debt Securities [Abstract]
Amortized cost	77,060	78,556
Gross unrealized gains	0	0
Gross unrealized losses	(6,211)	(7,879)
Allowance for credit losses	0	0
Fair value	70,849	70,677
U.S. Treasury Securities [Member]
Debt Securities [Abstract]
Amortized cost	162,300	162,236
Gross unrealized gains	0	0
Gross unrealized losses	(10,590)	(13,666)
Allowance for credit losses	0	0
Fair value	151,710	148,570
Obligations of State and Political Subdivisions [Member]
Debt Securities [Abstract]
Amortized cost	120,128	120,562
Gross unrealized gains	66	35
Gross unrealized losses	(8,656)	(10,297)
Allowance for credit losses	0	0
Fair value	111,538	110,300
Corporate Obligations [Member]
Debt Securities [Abstract]
Amortized cost	10,324	10,335
Gross unrealized gains	0	0
Gross unrealized losses	(972)	(952)
Allowance for credit losses	0	0
Fair value	9,352	9,383
Mortgage-backed Securities in Government Sponsored Entities [Member]
Debt Securities [Abstract]
Amortized cost	112,112	115,304
Gross unrealized gains	12	15
Gross unrealized losses	(12,158)	(14,743)
Allowance for credit losses	0	0
Fair value	$ 99,966	$ 100,576