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Changes to Accumulated Other Comprehensive (Loss) Gain, net - Components of Accumulated Other Comprehensive (Loss) Gain (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Beginning Balance $ 325,614 $ 231,271 $ 185,989 [1] $ 248,793
Change in net unrealized holding gains (losses) on securities available for sale, net of deferred tax expense (benefit) 10,000 (7,518) 10,573 (8,675)
Ending Balance 336,347 182,837 336,347 182,837
Net Unrealized (Losses) Gains on Available for Sale Securities [Member]        
Beginning Balance (44,908) (46,682) (45,481) (45,525)
Change in net unrealized holding gains (losses) on securities available for sale, net of deferred tax expense (benefit) 10,000 (8,022) 10,521 (9,179)
Reclassification for previously unrealized net losses on securities available for sale, net of income tax benefit   504 52 504
Ending Balance (34,908) (54,200) (34,908) (54,200)
Transfer of Securities Held to Maturity to Available For Sale [Member]        
Beginning Balance 425 425 425 425
Change in net unrealized holding gains (losses) on securities available for sale, net of deferred tax expense (benefit) 0 0 0 0
Reclassification for previously unrealized net losses on securities available for sale, net of income tax benefit   0 0 0
Ending Balance 425 425 425 425
Pension and Post-retirement Benefit Plans[Member]        
Beginning Balance   (1)   (1)
Change in net unrealized holding gains (losses) on securities available for sale, net of deferred tax expense (benefit)   0   0
Reclassification for previously unrealized net losses on securities available for sale, net of income tax benefit   0   0
Ending Balance   (1)   (1)
Accumulated Other Comprehensive (Gain) Loss, net        
Beginning Balance (44,483) (46,258) (45,056) (45,101)
Change in net unrealized holding gains (losses) on securities available for sale, net of deferred tax expense (benefit) 10,000 (8,022) 10,521 (9,179)
Reclassification for previously unrealized net losses on securities available for sale, net of income tax benefit   504 52 504
Ending Balance $ (34,483) $ (53,776) $ (34,483) $ (53,776)
[1] Derived from audited December 31, 2023 Consolidated Financial Statements.