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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Beginning Balance $ 257,586 $ 278,482 $ 259,373 [1] $ 277,139
Change in net unrealized holding losses on securities available for sale, net of deferred tax benefit (5,023) (16,015) (1,157) (33,859)
Ending Balance 231,271 261,660 231,271 261,660
Net Unrealized Losses on Available for Sale Securities [Member]        
Beginning Balance (41,659) (21,900) (45,525) (4,056)
Change in net unrealized holding losses on securities available for sale, net of deferred tax benefit (5,023) (16,015) (1,157) (33,859)
Ending Balance (46,682) (37,915) (46,682) (37,915)
Transfer of Securities Held to Maturity to Available For Sale [Member]        
Beginning Balance 425 425 425 425
Change in net unrealized holding losses on securities available for sale, net of deferred tax benefit 0 0 0 0
Ending Balance 425 425 425 425
Pension and Post-retirement Benefit Plans [Member]        
Beginning Balance (1) (1) (1) (1)
Change in net unrealized holding losses on securities available for sale, net of deferred tax benefit 0 0 0 0
Ending Balance (1) (1) (1) (1)
Accumulated Other Comprehensive Loss, net [Member]        
Beginning Balance (41,235) (21,476) (45,101) (3,632)
Change in net unrealized holding losses on securities available for sale, net of deferred tax benefit (5,023) (16,015) (1,157) (33,859)
Ending Balance $ (46,258) $ (37,491) $ (46,258) $ (37,491)
[1] Derived from audited December 31, 2022 Consolidated Financial Statements.