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Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance $ 568,984 $ 454,796
Net current period other comprehensive income (loss) 10,609 (6,323)
Balance 589,928 445,734
Hedging Derivative Instruments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance 3,085 3,911
Other comprehensive income (loss) before reclassifications (640) 675
Amounts reclassified from accumulated other comprehensive income 0 0
Net current period other comprehensive income (loss) (640) 675
Balance 2,445 4,586
Securities Available-For-Sale and Transferred Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (45,935) (111,906)
Other comprehensive income (loss) before reclassifications 11,136 (7,174)
Amounts reclassified from accumulated other comprehensive income 9 10
Net current period other comprehensive income (loss) 11,145 (7,164)
Balance (34,790) (119,070)
Pension And Post-Retirement Obligations [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (9,754) (11,946)
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income 104 166
Net current period other comprehensive income (loss) 104 166
Balance (9,650) (11,780)
Accumulated Other Comprehensive (Loss) Income [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (52,604) (119,941)
Other comprehensive income (loss) before reclassifications 10,496 (6,499)
Amounts reclassified from accumulated other comprehensive income 113 176
Net current period other comprehensive income (loss) 10,609 (6,323)
Balance $ (41,995) $ (126,264)