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Accumulated Other Comprehensive Loss (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Balance, Beginning			$ (25,971)
Balance, Ending	$ (25,851)			$ (25,971)
Investment securities- with OTTI [Member]
Balance, Beginning	(4,048)	$ (3,767)	(2,542)	(1,899)
Other comprehensive income/(loss) before reclassifications	518	(244)	(1,188)	(497)
Amounts reclassified from accumulated other comprehensive loss	(37)	(37)	(37)	(146)
Balance, Ending	(3,567)	(4,048)	(3,767)	(2,542)
Investment Securities -All Other AFS [Member]
Balance, Beginning	1,139	531	(853)	(3,601)
Other comprehensive income/(loss) before reclassifications	(235)	642	1,384	2,748
Amounts reclassified from accumulated other comprehensive loss	(421)	(34)
Balance, Ending	483	1,139	531	(853)
Investment Securities HTM [Member]
Balance, Beginning	(405)	(846)	(899)	(1,131)
Amounts reclassified from accumulated other comprehensive loss	54	441	53	232
Balance, Ending	(351)	(405)	(846)	(899)
Cash Flow Hedge (OCI) [Member]
Balance, Beginning	(1,129)	(1,048)	(85)	773
Other comprehensive income/(loss) before reclassifications	72	(81)	(963)	(858)
Balance, Ending	(1,057)	(1,129)	(1,048)	(85)
Pension Plan [Member]
Balance, Beginning	(21,933)	(25,332)	(20,417)	(18,017)
Other comprehensive income/(loss) before reclassifications	1,385	3,137	(5,177)	(3,189)
Amounts reclassified from accumulated other comprehensive loss	262	262	262	789
Balance, Ending	(20,286)	(21,933)	(25,332)	(20,417)
SERP [Member]
Balance, Beginning	(1,107)	(1,141)	(1,175)	(528)
Other comprehensive income/(loss) before reclassifications				(730)
Amounts reclassified from accumulated other comprehensive loss	34	34	34	83
Balance, Ending	(1,073)	(1,107)	(1,141)	(1,175)
Accumulated Other Comprehensive Loss [Member]
Balance, Beginning	(27,483)	(31,603)	(25,971)	(24,403)
Other comprehensive income/(loss) before reclassifications	1,740	3,454	(5,944)	(2,526)
Amounts reclassified from accumulated other comprehensive loss	(108)	666	312	958
Balance, Ending	$ (25,851)	$ (27,483)	$ (31,603)	$ (25,971)

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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