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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
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Equity [Abstract] |  |
Combined Federal and state income tax rate | 23.00% | 23.00%
Accumulated Other Comprehensive (Loss) Income |  |
Beginning Balance | $ 600,764 | $ 502,507
Other comprehensive loss before reclassifications | 8,698 | (8,218)
Amounts reclassified from other comprehensive loss | (67) | 0
Other comprehensive income | 8,631 | (8,218)
Adoption of new accounting pronouncement |  | 0
Ending balance | 619,241 | 491,877
Defined Benefit Pension Plans |  |
Accumulated Other Comprehensive (Loss) Income |  |
Beginning Balance | (5,871) | (5,033)
Ending balance | (5,871) | (5,033)
Unrealized Gain (Losses) on Securities Available-for-Sale |  |
Accumulated Other Comprehensive (Loss) Income |  |
Beginning Balance | (8,611) | (611)
Other comprehensive loss before reclassifications | 8,698 | (8,218)
Amounts reclassified from other comprehensive loss | (67) | 0
Other comprehensive income | 8,631 | (8,218)
Ending balance | 20 | (11,486)
Accumulated Other Comprehensive Income (Loss) |  |
Accumulated Other Comprehensive (Loss) Income |  |
Beginning Balance | (14,482) | (5,644)
Other comprehensive income | 8,631 | (8,218)
Ending balance | $ (5,851) | (16,519)
Accounting Standards Update 2016-01 |  |
Accumulated Other Comprehensive (Loss) Income |  |
Adoption of new accounting pronouncement |  | 2,657
Accounting Standards Update 2016-01 | Unrealized Gain (Losses) on Securities Available-for-Sale |  |
Accumulated Other Comprehensive (Loss) Income |  |
Adoption of new accounting pronouncement |  | 2,657
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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