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Employee Benefit Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |
Transition obligation period of recognition | 20 years |  |
Change in plan assets [Roll Forward] |  |  |
Employer contributions | $ 0 | $ 5,600 |
Assumptions used to determine benefit obligations [Abstract] |  |  |
Expected long-term return on plan assets | 7.00% | 7.00% | 7.00%
Rate of compensation increase | 3.00% | 3.00% | 3.00%
Assumptions used to determine net periodic pension cost [Abstract] |  |  |
Expected long-term return on plan assets | 7.00% | 7.00% | 7.50%
Rate of compensation increase | 3.00% | 3.00% |
Other changes in plan assets and benefit obligation recognized in OCI (pre-tax) [Abstract] |  |  |
Amortization of unrecognized net (loss) | $ 2,401 | $ 3,154 | $ (6,144)
Net actuarial loss and prior service costs that will be amortized from Accumulated other comprehensive income (loss) in next fiscal year | $ 1,200 |  |
Estimate future benefit payments [Abstract] |  |  |
Ultimate health care cost trend rate | 3.90% |  |
Effect of one-percentage point change in assumed health care cost trend rates [Abstract] |  |  |
One-percentage point increase on total service and interest cost components | $ 40 |  |
One-percentage point (decrease) on total service and interest cost components | (34) |  |
One-percentage point increase on post-retirement accumulated benefit obligation | 855 |  |
One-percentage point (decrease) on post-retirement accumulated benefit obligation | $ (738) |  |
Actual plan asset allocations [Abstract] |  |  |
Actual plan asset allocations | 100.00% | 100.00% |
Minimum [Member] |  |  |
Assumptions used to determine benefit obligations [Abstract] |  |  |
Discount rate | 4.20% | 4.76% | 4.69%
Assumptions used to determine net periodic pension cost [Abstract] |  |  |
Discount rate | 4.76% | 4.69% | 4.19%
Rate of compensation increase |  |  | 3.00%
Estimate future benefit payments [Abstract] |  |  |
Annual rates of increase in the per capita cost of covered medical and prescription drug benefits, | 6.30% |  |
Maximum [Member] |  |  |
Assumptions used to determine benefit obligations [Abstract] |  |  |
Discount rate | 4.21% | 4.84% | 4.71%
Assumptions used to determine net periodic pension cost [Abstract] |  |  |
Discount rate | 4.84% | 4.71% | 4.30%
Rate of compensation increase |  |  | 3.75%
Estimate future benefit payments [Abstract] |  |  |
Annual rates of increase in the per capita cost of covered medical and prescription drug benefits, | 10.50% |  |
Pension Benefits [Member] |  |  |
Accumulated other comprehensive income (loss), before tax [Abstract] |  |  |
Net actuarial loss | $ 23,585 | $ 28,328 |
Prior service cost (credit) | 94 | 140 |
Total amounts recognized in AOCI (pre-tax) | 23,679 | 28,468 |
Change in benefit obligation [Roll Forward] |  |  |
Benefit obligation at beginning of year | 90,477 | 92,445 |
Service cost | 1,511 | 2,162 | $ 2,677
Interest cost | 4,168 | 4,223 | 3,977
Plan participants' contributions | 0 | 0 |
Actuarial loss (gain) | 4,028 | (1,635) |
Curtailments/ settlement | 0 | (715) |
Benefits paid | (9,234) | (6,003) |
Projected benefit obligation at end of year | 90,950 | 90,477 | 92,445
Change in plan assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 116,216 | 107,529 |
Actual return on plan assets | 15,032 | 8,259 |
Employer contributions | 2,212 | 6,431 |
Plan participants' contributions | 0 | 0 |
Benefits paid | (9,234) | (6,003) |
Fair value of plan assets at end of year | 124,226 | 116,216 | 107,529
Funded (unfunded) status at year end | 33,276 | 25,739 |
Accumulated benefit obligation | 91,000 | 90,500 |
Amounts recognized in Balance Sheet [Abstract] |  |  |
Funded (unfunded) status at year end | 33,276 | 25,739 |
Components of net periodic benefit cost [Abstract] |  |  |
Service cost | 1,511 | 2,162 | 2,677
Interest cost | 4,168 | 4,223 | 3,977
Expected return on plan assets | (7,929) | (7,430) | (8,589)
Amortization of gain due to curtailment | 0 | (768) | (154)
Amortization of prior service cost (credit) | 46 | 32 | 21
Amortization of unrecognized net loss | 1,668 | 2,235 | 2,174
Total (benefit) cost | (536) | 454 | 106
Other changes in plan assets and benefit obligation recognized in OCI (pre-tax) [Abstract] |  |  |
Net (gain) loss | (3,075) | (2,464) | 6,523
Prior service cost | 0 | 96 | 0
Amortization of gain due to settlement | 0 | (43) | (46)
Amortization of prior service (cost) credit | (46) | (32) | (21)
Amortization of unrecognized net (loss) | (1,668) | (2,235) | (2,174)
Total recognized in other comprehensive income | (4,789) | (4,678) | 4,282
Total recognized in net periodic benefit cost and OCI pre-tax | (5,325) | (4,224) | 4,388
Estimate future benefit payments [Abstract] |  |  |
2018 | 7,256 |  |
2019 | 7,087 |  |
2020 | 6,997 |  |
2021 | 6,728 |  |
2022 | 6,666 |  |
2023 - 2027 | 37,688 |  |
Pension Benefits [Member] | Other Assets [Member] |  |  |
Amounts recognized in Balance Sheet [Abstract] |  |  |
Assets recognized | 52,775 | 45,344 |
Pension Benefits [Member] | Other Liabilities [Member] |  |  |
Amounts recognized in Balance Sheet [Abstract] |  |  |
Liabilities recognized | $ (19,499) | $ (19,605) |
Pension Benefits [Member] | Cash and Cash Equivalents [Member] |  |  |
Actual plan asset allocations [Abstract] |  |  |
Actual plan asset allocations | 3.00% | 2.00% |
Pension Benefits [Member] | Cash and Cash Equivalents [Member] | Minimum [Member] |  |  |
Target asset allocations [Abstract] |  |  |
Target allocation percentage of assets | 0.00% |  |
Pension Benefits [Member] | Cash and Cash Equivalents [Member] | Maximum [Member] |  |  |
Target asset allocations [Abstract] |  |  |
Target allocation percentage of assets | 20.00% |  |
Pension Benefits [Member] | Fixed Income Securities [Member] |  |  |
Actual plan asset allocations [Abstract] |  |  |
Actual plan asset allocations | 45.00% | 46.00% |
Pension Benefits [Member] | Fixed Income Securities [Member] | Minimum [Member] |  |  |
Target asset allocations [Abstract] |  |  |
Target allocation percentage of assets | 25.00% |  |
Pension Benefits [Member] | Fixed Income Securities [Member] | Maximum [Member] |  |  |
Target asset allocations [Abstract] |  |  |
Target allocation percentage of assets | 55.00% |  |
Pension Benefits [Member] | Equities [Member] |  |  |
Actual plan asset allocations [Abstract] |  |  |
Actual plan asset allocations | 52.00% | 52.00% |
Pension Benefits [Member] | Equities [Member] | Minimum [Member] |  |  |
Target asset allocations [Abstract] |  |  |
Target allocation percentage of assets | 40.00% |  |
Pension Benefits [Member] | Equities [Member] | Maximum [Member] |  |  |
Target asset allocations [Abstract] |  |  |
Target allocation percentage of assets | 65.00% |  |
Other Benefits [Member] |  |  |
Accumulated other comprehensive income (loss), before tax [Abstract] |  |  |
Net actuarial loss | $ 1,731 | $ 1,430 |
Prior service cost (credit) | 196 | (38) |
Total amounts recognized in AOCI (pre-tax) | 1,927 | 1,392 |
Change in benefit obligation [Roll Forward] |  |  |
Benefit obligation at beginning of year | 7,478 | 8,322 |
Service cost | 12 | 14 | 17
Interest cost | 357 | 353 | 374
Plan participants' contributions | 218 | 234 |
Actuarial loss (gain) | 388 | (786) |
Curtailments/ settlement | 286 | 0 |
Benefits paid | (689) | (659) |
Projected benefit obligation at end of year | 8,050 | 7,478 | 8,322
Change in plan assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Employer contributions | 471 | 425 |
Plan participants' contributions | 218 | 234 |
Benefits paid | (689) | (659) |
Fair value of plan assets at end of year | 0 | 0 | 0
Funded (unfunded) status at year end | (8,050) | (7,478) |
Accumulated benefit obligation | 8,050 | 7,500 |
Amounts recognized in Balance Sheet [Abstract] |  |  |
Funded (unfunded) status at year end | (8,050) | (7,478) |
Components of net periodic benefit cost [Abstract] |  |  |
Service cost | 12 | 14 | 17
Interest cost | 357 | 353 | 374
Expected return on plan assets | 0 | 0 | 0
Amortization of gain due to curtailment | 0 | 0 | 0
Amortization of prior service cost (credit) | 51 | (57) | (219)
Amortization of unrecognized net loss | 87 | 117 | 263
Total (benefit) cost | 507 | 427 | 435
Other changes in plan assets and benefit obligation recognized in OCI (pre-tax) [Abstract] |  |  |
Net (gain) loss | 388 | (786) | (333)
Prior service cost | 286 | 0 | 0
Amortization of gain due to settlement | 0 | 0 | 0
Amortization of prior service (cost) credit | (51) | 57 | 219
Amortization of unrecognized net (loss) | (87) | (117) | (263)
Total recognized in other comprehensive income | 536 | (846) | (377)
Total recognized in net periodic benefit cost and OCI pre-tax | 1,043 | (419) | $ 58
Estimate future benefit payments [Abstract] |  |  |
2018 | 606 |  |
2019 | 598 |  |
2020 | 583 |  |
2021 | 559 |  |
2022 | 566 |  |
2023 - 2027 | 2,818 |  |
Other Benefits [Member] | Other Assets [Member] |  |  |
Amounts recognized in Balance Sheet [Abstract] |  |  |
Assets recognized | 0 | 0 |
Other Benefits [Member] | Other Liabilities [Member] |  |  |
Amounts recognized in Balance Sheet [Abstract] |  |  |
Liabilities recognized | $ (8,050) | $ (7,478) |

X
- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References No definition available. + Details
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- Definition The weighted average period over which the transition obligation is expected to be recognized, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, before 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 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: 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 + Details
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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of 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 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -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 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost 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 (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for 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 (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contributions received by defined benefit plan from participant which increase benefit obligation. + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate. + 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 (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of decrease in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point decrease in assumed health care cost trend rate. + 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 (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of increase in accumulated postretirement benefit obligation from one-percentage-point increase in assumed health care cost trend rate. + 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 (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of increase in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point increase in assumed health care cost trend rate. + 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 (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets 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)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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