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Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Balance | $ 439,393 | $ 438,947 | $ 408,253 | $ 396,293 | $ 438,947 | $ 396,293
Other comprehensive income (loss) before reclassifications | 1,778 |  | 5,164 |  | 14,105 | 10,283
Amounts reclassified from accumulated other comprehensive income (loss) | (192) |  | 230 |  | (88) | 621
Total other comprehensive income, net of tax | 1,586 | 12,431 | 5,394 | 5,510 | 14,017 | 10,904
Balance | 448,045 | 439,393 | 422,354 | 408,253 | 448,045 | 422,354
Hedging Derivative Instruments [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Balance | (427) | (518) | (530) | (276) | (518) | (276)
Other comprehensive income (loss) before reclassifications | (388) |  | (106) |  | (297) | (360)
Total other comprehensive income, net of tax | (388) |  | (106) |  | (297) | (360)
Balance | (815) | (427) | (636) | (530) | (815) | (636)
Securities Available-For-Sale and Transferred Securities [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Balance | 12,979 | 873 | (2,947) | (7,769) | 873 | (7,769)
Other comprehensive income (loss) before reclassifications | 2,166 |  | 5,270 |  | 14,402 | 10,643
Reclassification of income tax effects to retained earnings |  |  |  |  |  | (681)
Amounts reclassified from accumulated other comprehensive income (loss) | (425) |  | (31) |  | (555) | 99
Total other comprehensive income, net of tax | 1,741 |  | 5,239 |  | 13,847 | 10,742
Balance | 14,720 | 12,979 | 2,292 | (2,947) | 14,720 | 2,292
Pension And Post-Retirement Obligations [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Balance | (14,634) | (14,868) | (15,077) | (13,236) | (14,868) | (13,236)
Reclassification of income tax effects to retained earnings |  |  |  |  |  | (2,102)
Amounts reclassified from accumulated other comprehensive income (loss) | 233 |  | 261 |  | 467 | 522
Total other comprehensive income, net of tax | 233 |  | 261 |  | 467 | 522
Balance | (14,401) | (14,634) | (14,816) | (15,077) | (14,401) | (14,816)
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Balance | (2,082) | (14,513) | (18,554) | (21,281) | (14,513) | (21,281)
Other comprehensive income (loss) before reclassifications | 1,778 |  | 5,164 |  | 14,105 | 10,283
Reclassification of income tax effects to retained earnings |  |  |  |  |  | (2,783)
Amounts reclassified from accumulated other comprehensive income (loss) | (192) |  | 230 |  | (88) | 621
Total other comprehensive income, net of tax | 1,586 | 12,431 | 5,394 | 5,510 | 14,017 | 10,904
Balance | $ (496) | $ (2,082) | $ (13,160) | $ (18,554) | $ (496) | $ (13,160)

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