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Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Balance | $ 487,126 | $ 466,284 | $ 468,363 | $ 448,045 | $ 439,393 | $ 438,947 | $ 468,363 | $ 438,947
Other comprehensive income (loss) before reclassifications | 6,351 |  |  | 401 |  |  | (14,735) | 14,506
Amounts reclassified from accumulated other comprehensive income (loss) | 169 |  |  | (114) |  |  | 491 | (202)
Other comprehensive income (loss), net of tax | (6,182) | 4,638 | (12,700) | 287 | 1,586 | 12,431 | (14,244) | 14,304
Balance | 494,013 | 487,126 | 466,284 | 456,361 | 448,045 | 439,393 | 494,013 | 456,361
Hedging Derivative Instruments [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Balance | 747 |  | (316) | (815) |  | (518) | (316) | (518)
Other comprehensive income (loss) before reclassifications | (80) |  |  | 123 |  |  | 1,143 | (174)
Other comprehensive income (loss), net of tax | (80) |  |  | 123 |  |  | 1,143 | (174)
Balance | 827 | 747 |  | (692) | (815) |  | 827 | (692)
Securities Available-For-Sale and Transferred Securities [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Balance | 5,343 |  | 14,743 | 14,720 |  | 873 | 14,743 | 873
Other comprehensive income (loss) before reclassifications | 6,431 |  |  | 278 |  |  | (15,878) | 14,680
Amounts reclassified from accumulated other comprehensive income (loss) | 31 |  |  | (347) |  |  | 78 | (902)
Other comprehensive income (loss), net of tax | 6,400 |  |  | (69) |  |  | (15,800) | 13,778
Balance | 1,057 | 5,343 |  | 14,651 | 14,720 |  | 1,057 | 14,651
Pension And Post-Retirement Obligations [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Balance | (12,024) |  | (12,299) | (14,401) |  | (14,868) | (12,299) | (14,868)
Amounts reclassified from accumulated other comprehensive income (loss) | 138 |  |  | 233 |  |  | 413 | 700
Other comprehensive income (loss), net of tax | 138 |  |  | 233 |  |  | 413 | 700
Balance | (11,886) | (12,024) |  | (14,168) | (14,401) |  | (11,886) | (14,168)
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Balance | (5,934) | (10,572) | 2,128 | (496) | (2,082) | (14,513) | 2,128 | (14,513)
Other comprehensive income (loss), net of tax | (6,182) | 4,638 | (12,700) | 287 | 1,586 | 12,431 |  |
Balance | $ (12,116) | $ (5,934) | $ (10,572) | $ (209) | $ (496) | $ (2,082) | $ (12,116) | $ (209)

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