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Other Liabilities (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Aug. 29, 2014
Other Liabilities [Line Items] |  |  |  |  |  |
Accrued pension costs | $ 5,480,000 |  | $ 5,480,000 |  | $ 5,732,000 | $ 7,500,000
Service cost | 0 | $ 0 | 0 | $ 0 |  |
Interest cost | 45,000 | 45,000 | 90,000 | 90,000 |  |
Actuarial loss (gain) | 51,000 | $ 32,000 | 103,000 | $ 64,000 |  |
Benefit obligation | $ 10,200,000 |  | $ 10,200,000 |  |  |
Discount rate | 4.25% |  | 4.25% |  |  |
Discount term |  |  | 15 years |  |  |
Monthly estate payment amount | $ 57,000 |  | $ 57,000 |  |  |
Discounted value | 2,700,000 |  | 2,700,000 |  |  |
Accumulated prior service cost | 3,100,000 |  | $ 3,100,000 |  |  |
Accumulated prior service cost amortization period |  |  | 15 years |  |  |
Accrued pension costs included in other liabilities | $ 8,000,000 |  | $ 8,000,000 |  |  |
Supplemental Executive Retirement Plans [Member] |  |  |  |  |  |
Other Liabilities [Line Items] |  |  |  |  |  |
Accrued pension costs |  |  |  |  |  | $ 7,600,000

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- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension plan. Excludes other postretirement benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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