Accumulated Other Comprehensive Income (Loss) (AOCI)- Amount Reclassified from AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Defined Benefit Pension Plan Items
Amount Reclassified from AOCI
Net of tax	$ 18	$ 24
Defined Benefit Pension Plan Items | Amount Reclassified from AOCI
Amount Reclassified from AOCI
Other noninterest expense	26	34
Income tax benefit	(8)	(10)
Net of tax	18	24
Prior transition obligation and actuarial losses | Amount Reclassified from AOCI
Amount Reclassified from AOCI
Other noninterest expense	52	47
Prior service cost and actuarial losses | Amount Reclassified from AOCI
Amount Reclassified from AOCI
Other noninterest expense	(26)	(13)
Accumulated Other Comprehensive Loss
Amount Reclassified from AOCI
Net of tax	18	24
Accumulated Other Comprehensive Loss | Amount Reclassified from AOCI
Amount Reclassified from AOCI
Net of tax	$ 18	$ 24