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Employee Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Contribution Plan [Line Items] |  |  |
Matched percentage by employer | 50.00% |  |
Maximum employee percentage of deferred salary matched by employer | 6.00% |  |
Non-elective safe-harbor contribution received each December 31st | 3.00% |  |
Employer contributions | $ 1,000 | $ 1,000 | $ 990
Maximum age benefit could be reduced or forfeited | 65 years |  |
Supplemental income benefit liability | $ 49 | 56 |
Supplemental income benefit expense | $ 29 | $ 29 | $ 29
Minimum [Member] |  |  |
Defined Contribution Plan [Line Items] |  |  |
Non-elective safe-harbor contribution received each December 31st | 1.00% |  |
Maximum [Member] |  |  |
Defined Contribution Plan [Line Items] |  |  |
Non-elective safe-harbor contribution received each December 31st | 10.00% |  |

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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + 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 (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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