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Employee Benefit Plans (Schedule of Reconciliation of Balances in AOCI - SERP) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net gain (loss) arising during period | $ 1,601 | $ (557) | $ (4,321)
SERP [Member] |  |  |
Accumulated other comprehensive loss at beginning of fiscal year | 533 | 625 |
Net gain (loss) arising during period | (85) | (145) |
Prior service cost |  |  |
Amortization of unrecognized actuarial loss | (34) | (35) |
Amortization of prior service cost and transition obligation |  |  |
Tax benefit (expense) related to changes during the year, net | 43 | 88 |
Accumulated other comprehensive gain (loss) at end fiscal year | $ 457 | $ 533 | $ 625

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- Definition Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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