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Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance $ 454,796 $ 405,605 $ 505,142
Net current period other comprehensive income (loss) 67,337 17,546 (124,280)
Balance 568,984 454,796 405,605
Hedging Derivative Instruments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 3,911 4,735 1,160
Other comprehensive income (loss) before reclassifications (826) (824) 3,575
Amounts reclassified from accumulated other comprehensive income (loss) 0 0 0
Net current period other comprehensive income (loss) (826) (824) 3,575
Balance 3,085 3,911 4,735
Securities Available-For-Sale and Transferred Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (111,906) (128,634) (4,971)
Other comprehensive income (loss) before reclassifications (8,489) 14,020 (123,750)
Amounts reclassified from accumulated other comprehensive income (loss) 74,460 2,708 87
Net current period other comprehensive income (loss) 65,971 16,728 (123,663)
Balance (45,935) (111,906) (128,634)
Pension And Post-Retirement Obligations [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (11,946) (13,588) (9,396)
Other comprehensive income (loss) before reclassifications 1,616 (1,837) (4,412)
Amounts reclassified from accumulated other comprehensive income (loss) 576 3,479 220
Net current period other comprehensive income (loss) 2,192 1,642 (4,192)
Balance (9,754) (11,946) (13,588)
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (119,941) (137,487) (13,207)
Other comprehensive income (loss) before reclassifications (7,699) 11,359 (124,587)
Amounts reclassified from accumulated other comprehensive income (loss) 75,036 6,187 307
Net current period other comprehensive income (loss) 67,337 17,546 (124,280)
Balance $ (52,604) $ (119,941) $ (137,487)