Accumulated Other Comprehensive Loss - Other Comprehensive Income (Loss) and Related Tax Effects (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Loss
Unrealized gain (loss) on investment securities available for sale	$ 14,804	$ (66,435)	$ (11,487)
Net (gain) loss on the sale of investment securities available for sale (1)	(81)	1,976
Other comprehensive income (loss) on available for sale debt securities	14,723	(64,459)	(11,487)
Amortization of actuarial loss (2)	194	198	301
Actuarial gain (loss)	935	172	1,808
Net change in benefit plan liabilities	1,129	370	2,109
Net change in derivatives	(824)	(728)	(322)
Other comprehensive income (loss)	15,028	(64,817)	(9,700)
Income tax expense (benefit)	3,043	(13,995)	(2,037)
Other comprehensive income (loss)	$ 11,985	$ (50,822)	$ (7,663)