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Employee Benefit Plans (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2017 | Jan. 31, 2016 | Mar. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Discretionary contribution as percentage of employee's base pay |  |  |  |  |  | 15.00% |
Defined Contribution Plan, Employer Discretionary Contribution Amount |  | $ 63,500 |  |  |  |  |
Vesting period of employer discretionary contribution |  | 2 years |  |  |  |  |
Defined Contribution Plan, Cost Recognized |  |  |  |  |  | $ 1,000,000 | $ 1,000,000
Lump sum paid in lieu of pension benefits |  |  |  | $ 1,700,000 |  |  |
Defined Benefit Plan, Narrative Description of Basis Used to Determine Overall Expected Long-term Rate-of-Return on Assets Assumption |  |  |  |  |  | the 25-year average return on pension portfolio assets was 7.68%, exceeding the expected long-term return of 7.00% utilized for 2016. Based on the actual performance experience noted above and long-term returns of relevant indices, a case could be built for retaining the expected returns at the existing level. However, there are a number of reasons that would support a lowering of the expected return. For example, since the early 1980s, there has been a general trend of lower interest rates that have supported bond market performance in a positive manner. Such support would likely be reversed if the general trend in rates reverses for an extended period. Since bond market exposure represents a significant portion of pension plan assets, weaker performance from bonds would be reflected in pension returns. Also, expectations from global economic growth continue to be muted, despite the efforts of the efforts of central banks around the world. Further, long-term average returns of benchmark indices are impacted by favorable markets during the 1990s that may or may not be repeated in the foreseeable future. |
Subsequent Event [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 112,708 |  |  |  |  |  |
Pension [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Accumulated Benefit Obligation |  |  |  | $ 38,200,000 |  | $ 38,200,000 | 36,100,000
Average return on pension portfolio assets |  |  |  | 7.68% |  | 7.68% |
Expected long-term return on pension portfolio assets |  |  |  | 7.00% |  | 7.00% |
Defined Benefit Plan, Contributions by Employer |  |  |  |  | $ 3,000,000 | $ 3,000,000 | 2,000,000
Pension [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Contributions by Employer |  |  | $ 3,000,000 |  |  |  |
SERP [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Contribution Plan, Cost Recognized |  | $ 31,770 |  |  |  |  |
Defined Benefit Plan, Accumulated Benefit Obligation |  |  |  | $ 6,300,000 |  | 6,300,000 | 5,400,000
Defined Benefit Plan, Contributions by Employer |  |  |  |  |  | $ 141,000 | $ 88,000

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- Definition A percentage calculated as a basis for determining the 25-year average return on pension portfolio assets. + References No definition available. + Details
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- Definition A percentage calculated as a basis for determining the expected 25-year average return on pension portfolio assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References No definition available. + Details
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- Definition Represents payments of lump sums offered to terminated employees who had not yet started receiving their pension benefits. + References No definition available. + Details
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- Definition Represents the vesting period of a discretionary contribution to benefit plan on the part of employer. + References No definition available. + Details
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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + 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 (b)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition A narrative description of the basis used to determine the overall expected long-term rate-of-return on assets assumption, such as the general approach used, the extent to which the overall rate-of-return on assets assumption was based on historical returns, the extent to which adjustments were made to those historical returns to reflect expectations of future returns, and how those adjustments were determined. The description would generally consider the major categories of 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)(3) -URI http://asc.fasb.org/extlink&oid=58740216&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 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + 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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