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Changes to Accumulated Other Comprehensive Income (Loss), net - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Beginning Balance $ 185,989 [1] $ 248,793
Change in net unrealized holding gains (losses) on securities available for sale, net of deferred tax expense (benefit) (2,558) 3,866
Ending Balance 180,906 246,735
Net Unrealized (Losses) Gains on Available for Sale Securities [Member]    
Beginning Balance (45,481) (45,525)
Change in net unrealized holding gains (losses) on securities available for sale, net of deferred tax expense (benefit) (2,558) 3,866
Ending Balance (48,039) (41,659)
Transfer of Securities Held to Maturity to Available For Sale [Member]    
Beginning Balance 425 425
Change in net unrealized holding gains (losses) on securities available for sale, net of deferred tax expense (benefit) 0 0
Ending Balance 425 425
Pension and Post-retirement Benefit Plans[Member]    
Beginning Balance 0 (1)
Change in net unrealized holding gains (losses) on securities available for sale, net of deferred tax expense (benefit) 0 0
Ending Balance 0 (1)
Accumulated Other Comprehensive (Loss) Income, net [Member]    
Beginning Balance (45,056) (45,101)
Change in net unrealized holding gains (losses) on securities available for sale, net of deferred tax expense (benefit) (2,558) 3,866
Ending Balance $ (47,614) $ (41,235)
[1] Derived from audited December 31, 2023 Consolidated Financial Statements.