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Accumulated Other Comprehensive Loss (Schedule of Changes In Each Component of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Equity [Abstract] |  |  |  |
Combined Federal and state income tax rate | 23.00% | 37.00% | 23.00% | 37.00%
Accumulated Other Comprehensive (Loss) Income |  |  |  |
Beginning Balance | $ 503,753 | $ 492,507 | $ 502,507 | $ 442,438
Other comprehensive income before reclassifications |  |  | (14,976) | 5,933
Amounts reclassified from other comprehensive loss |  |  | 0 | (2,698)
Other comprehensive income | (4,325) | 308 | (14,976) | 3,235
Adoption of new accounting pronouncement |  |  | 0 |
Ending balance | 512,026 | 500,315 | 512,026 | 500,315
Defined Benefit Pension Plans |  |  |  |
Accumulated Other Comprehensive (Loss) Income |  |  |  |
Beginning Balance |  |  | (5,033) | (4,660)
Ending balance | (5,033) | (4,660) | (5,033) | (4,660)
Unrealized Gain (Losses) on Securities Available-for-Sale |  |  |  |
Accumulated Other Comprehensive (Loss) Income |  |  |  |
Beginning Balance |  |  | (611) | (2,352)
Other comprehensive income before reclassifications |  |  | (14,976) | 5,933
Amounts reclassified from other comprehensive loss |  |  | 0 | (2,698)
Other comprehensive income |  |  | (14,976) | 3,235
Adoption of new accounting pronouncement |  |  | 2,657 |
Ending balance | (18,244) | 883 | (18,244) | 883
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive (Loss) Income |  |  |  |
Beginning Balance | (18,952) | (4,085) | (5,644) | (7,012)
Other comprehensive income | (4,325) | 308 | (14,976) | 3,235
Adoption of new accounting pronouncement |  |  | 2,657 |
Ending balance | $ (23,277) | $ (3,777) | (23,277) | $ (3,777)
Accounting Standards Update 2016-01 |  |  |  |
Accumulated Other Comprehensive (Loss) Income |  |  |  |
Adoption of new accounting pronouncement |  |  | 2,700 |
Accounting Standards Update 2016-01 | Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive (Loss) Income |  |  |  |
Adoption of new accounting pronouncement |  |  | $ 2,657 |

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