Investment Securities - Gross Unrealized Losses and Fair Value by Investment Category (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Total debt securities
Debt and Equity Securities, FV-NI [Line Items]
Fair value, less than twelve months	$ 40,876	$ 115,236
Gross unrealized losses, less than twelve months	(1,848)	(5,567)
Fair value, twelve months or greater	137,385	62,709
Gross unrealized losses, twelve months or greater	(11,932)	(7,077)
Fair value, total	178,261	177,945
Gross unrealized losses, total	(13,780)	(12,644)
U.S. Government and agency securities
Debt and Equity Securities, FV-NI [Line Items]
Fair value, less than twelve months	967	2,896
Gross unrealized losses, less than twelve months	(33)	(106)
Fair value, twelve months or greater	2,897	0
Gross unrealized losses, twelve months or greater	(104)	0
Fair value, total	3,864	2,896
Gross unrealized losses, total	(137)	(106)
Mortgage-backed securities
Debt and Equity Securities, FV-NI [Line Items]
Fair value, less than twelve months	10,263	0
Gross unrealized losses, less than twelve months	(454)	0
Fair value, twelve months or greater	1,125	1,282
Gross unrealized losses, twelve months or greater	(251)	(214)
Fair value, total	11,388	1,282
Gross unrealized losses, total	(705)	(214)
State and political securities
Debt and Equity Securities, FV-NI [Line Items]
Fair value, less than twelve months	19,050	95,444
Gross unrealized losses, less than twelve months	(1,013)	(4,797)
Fair value, twelve months or greater	97,522	36,283
Gross unrealized losses, twelve months or greater	(8,164)	(3,977)
Fair value, total	116,572	131,727
Gross unrealized losses, total	(9,177)	(8,774)
Other debt securities
Debt and Equity Securities, FV-NI [Line Items]
Fair value, less than twelve months	10,596	16,896
Gross unrealized losses, less than twelve months	(348)	(664)
Fair value, twelve months or greater	35,841	25,144
Gross unrealized losses, twelve months or greater	(3,413)	(2,886)
Fair value, total	46,437	42,040
Gross unrealized losses, total	$ (3,761)	$ (3,550)