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Accumulated Other Comprehensive (Loss) Income (Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance $ 454,796 $ 405,605
Net current period other comprehensive income (loss) (6,323) 10,115
Balance 445,734 422,823
Hedging Derivative Instruments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance 3,911 4,735
Other comprehensive income (loss) before reclassifications 675 (663)
Amounts reclassified from accumulated other comprehensive income 0 0
Net current period other comprehensive income (loss) 675 (663)
Balance 4,586 4,072
Securities Available-For-Sale and Transferred Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (111,906) (128,634)
Other comprehensive income (loss) before reclassifications (7,174) 10,620
Amounts reclassified from accumulated other comprehensive income 10 14
Net current period other comprehensive income (loss) (7,164) 10,634
Balance (119,070) (118,000)
Pension And Post-Retirement Obligations [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (11,946) (13,588)
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income 166 144
Net current period other comprehensive income (loss) 166 144
Balance (11,780) (13,444)
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (119,941) (137,487)
Other comprehensive income (loss) before reclassifications (6,499) 9,957
Amounts reclassified from accumulated other comprehensive income 176 158
Net current period other comprehensive income (loss) (6,323) 10,115
Balance $ (126,264) $ (127,372)