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Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance $ 601,668 $ 589,928 $ 568,984 $ 467,667 $ 445,734 $ 454,796 $ 568,984 $ 454,796
Net current period other comprehensive (loss) income 5,456 (219) 10,609 23,745 490 (6,323) 15,846 17,912
Balance 621,720 601,668 589,928 500,342 467,667 445,734 621,720 500,342
Hedging Derivative Instruments [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance 2,036   3,085 4,381   3,911 3,085 3,911
Other comprehensive income (loss) before reclassifications (363)     (1,851)     (1,412) (1,381)
Amounts reclassified from accumulated other comprehensive income 0     0     0 0
Net current period other comprehensive (loss) income (363)     (1,851)     (1,412) (1,381)
Balance 1,673 2,036   2,530 4,381   1,673 2,530
Securities Available-For-Sale and Transferred Securities [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance (34,703)   (45,935) (118,541)   (111,906) (45,935) (111,906)
Other comprehensive income (loss) before reclassifications 6,230     25,420     17,447 18,765
Amounts reclassified from accumulated other comprehensive income (515)     10     (500) 30
Net current period other comprehensive (loss) income 5,715     25,430     16,947 18,795
Balance (28,988) (34,703)   (93,111) (118,541)   (28,988) (93,111)
Pension And Post-Retirement Obligations [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance (9,547)   (9,754) (11,614)   (11,946) (9,754) (11,946)
Other comprehensive income (loss) before reclassifications 0     0     0 0
Amounts reclassified from accumulated other comprehensive income 104     166     311 498
Net current period other comprehensive (loss) income 104     166     311 498
Balance (9,443) (9,547)   (11,448) (11,614)   (9,443) (11,448)
Accumulated Other Comprehensive (Loss) Income [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance (42,214) (41,995) (52,604) (125,774) (126,264) (119,941) (52,604) (119,941)
Other comprehensive income (loss) before reclassifications 5,867     23,569     16,035 17,384
Amounts reclassified from accumulated other comprehensive income (411)     176     (189) 528
Net current period other comprehensive (loss) income 5,456 (219) 10,609 23,745 490 (6,323) 15,846 17,912
Balance $ (36,758) $ (42,214) $ (41,995) $ (102,029) $ (125,774) $ (126,264) $ (36,758) $ (102,029)