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Employee Benefit Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined benefit plan disclosure [Abstract] |  |  |
Transition obligation period of recognition | 20 years |  |
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% | 7.00%
Rate of compensation increase | 3.00% | 3.00% | 3.00%
Other changes in plan assets and benefit obligation recognized in OCI (pre-tax) [Abstract] |  |  |
Net (gain) loss | $ (5,331) | $ 12,457 | $ (2,401)
Amortization of unrecognized net (loss) | 1,333 | $ (3,038) | $ 570
Net actuarial loss and prior service costs that will be amortized from Accumulated other comprehensive income (loss) in next fiscal year | $ 1,600 |  |
Estimate future benefit payments [Abstract] |  |  |
Ultimate health care cost trend rate | 3.80% |  |
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 | $ 29 |  |
One-percentage point (decrease) on total service and interest cost components | (25) |  |
One-percentage point increase on post-retirement accumulated benefit obligation | 628 |  |
One-percentage point (decrease) on post-retirement accumulated benefit obligation | $ (543) |  |
Actual plan asset allocations [Abstract] |  |  |
Actual plan asset allocations | 100.00% | 100.00% |
Minimum [Member] |  |  |
Assumptions used to determine benefit obligations [Abstract] |  |  |
Discount rate | 3.69% | 4.79% | 4.20%
Assumptions used to determine net periodic pension cost [Abstract] |  |  |
Discount rate | 4.79% | 4.20% | 4.76%
Estimate future benefit payments [Abstract] |  |  |
Annual rates of increase in the per capita cost of covered medical and prescription drug benefits, | 4.50% |  |
Maximum [Member] |  |  |
Assumptions used to determine benefit obligations [Abstract] |  |  |
Discount rate | 3.73% | 4.80% | 4.21%
Assumptions used to determine net periodic pension cost [Abstract] |  |  |
Discount rate | 4.80% | 4.21% | 4.84%
Estimate future benefit payments [Abstract] |  |  |
Annual rates of increase in the per capita cost of covered medical and prescription drug benefits, | 7.00% |  |
Pension Benefits [Member] |  |  |
Accumulated other comprehensive income (loss), before tax [Abstract] |  |  |
Net actuarial loss | $ 28,334 | $ 35,538 |
Prior service cost | 491 | 570 |
Total amounts recognized in AOCI (pre-tax) | 28,825 | 36,108 |
Change in benefit obligation [Roll Forward] |  |  |
Benefit obligation at beginning of year | 85,134 | 90,950 |
Service cost | 1,723 | 1,659 | $ 1,511
Interest cost | 3,942 | 3,645 | 4,168
Plan participants' contributions | 0 | 0 |
Actuarial loss (gain) | 6,030 | (3,977) |
Amendments | 0 | 337 |
Benefits paid | (6,243) | (7,480) |
Projected benefit obligation at end of year | 90,586 | 85,134 | 90,950
Change in plan assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 109,746 | 124,226 |
Actual return on plan assets | 18,120 | (8,381) |
Employer contributions | 1,372 | 1,381 |
Plan participants' contributions | 0 | 0 |
Benefits paid | (6,243) | (7,480) |
Fair value of plan assets at end of year | 122,995 | 109,746 | 124,226
Funded (unfunded) status at year end | 32,409 | 24,612 |
Accumulated benefit obligation | 90,600 | 85,100 |
Amounts recognized in Balance Sheet [Abstract] |  |  |
Funded (unfunded) status at year end | 32,409 | 24,612 |
Components of net periodic cost (benefit) [Abstract] |  |  |
Service cost | 1,723 | 1,659 | 1,511
Interest cost | 3,942 | 3,645 | 4,168
Expected return on plan assets | (7,480) | (8,478) | (7,929)
Amortization of prior service cost | 43 | 40 | 46
Amortization of unrecognized net loss | 2,593 | 930 | 1,668
Net periodic pension cost (benefit) | 821 | (2,204) | (536)
Other changes in plan assets and benefit obligation recognized in OCI (pre-tax) [Abstract] |  |  |
Net (gain) loss | (4,611) | 12,882 | (3,075)
Prior service cost | 0 | 337 | 0
Amortization of prior service (cost) | (43) | (40) | (46)
Amortization of unrecognized net (loss) | (2,593) | (930) | (1,668)
Total recognized in OCI | (7,247) | 12,249 | (4,789)
Total recognized in net periodic benefit cost and OCI pre-tax | (6,426) | 10,045 | (5,325)
Estimate future benefit payments [Abstract] |  |  |
2020 | 6,916 |  |
2021 | 6,722 |  |
2022 | 6,722 |  |
2023 | 6,582 |  |
2024 | 7,827 |  |
2025 - 2029 | 35,215 |  |
Employer voluntary contribution to plan | 0 | 0 |
Pension Benefits [Member] | Other Assets [Member] |  |  |
Amounts recognized in Balance Sheet [Abstract] |  |  |
Assets recognized | 51,988 | 42,900 |
Pension Benefits [Member] | Other Liabilities [Member] |  |  |
Amounts recognized in Balance Sheet [Abstract] |  |  |
Liabilities recognized | $ (19,579) | $ (18,288) |
Pension Benefits [Member] | Cash and Cash Equivalents [Member] |  |  |
Actual plan asset allocations [Abstract] |  |  |
Actual plan asset allocations | 3.00% | 4.00% |
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 | 15.00% |  |
Pension Benefits [Member] | Fixed Income Securities [Member] |  |  |
Actual plan asset allocations [Abstract] |  |  |
Actual plan asset allocations | 40.00% | 39.00% |
Pension Benefits [Member] | Fixed Income Securities [Member] | Minimum [Member] |  |  |
Target asset allocations [Abstract] |  |  |
Target allocation percentage of assets | 30.00% |  |
Pension Benefits [Member] | Fixed Income Securities [Member] | Maximum [Member] |  |  |
Target asset allocations [Abstract] |  |  |
Target allocation percentage of assets | 60.00% |  |
Pension Benefits [Member] | Equities [Member] |  |  |
Actual plan asset allocations [Abstract] |  |  |
Actual plan asset allocations | 57.00% | 57.00% |
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 | 70.00% |  |
Other Benefits [Member] |  |  |
Accumulated other comprehensive income (loss), before tax [Abstract] |  |  |
Net actuarial loss | $ 125 | $ 844 |
Prior service cost | 94 | 145 |
Total amounts recognized in AOCI (pre-tax) | 219 | 989 |
Change in benefit obligation [Roll Forward] |  |  |
Benefit obligation at beginning of year | 7,034 | 8,050 |
Service cost | 7 | 10 | 12
Interest cost | 272 | 327 | 357
Plan participants' contributions | 201 | 209 |
Actuarial loss (gain) | (719) | (762) |
Amendments | 0 | 0 |
Benefits paid | (712) | (800) |
Projected benefit obligation at end of year | 6,083 | 7,034 | 8,050
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 | 511 | 591 |
Plan participants' contributions | 201 | 209 |
Benefits paid | (712) | (800) |
Fair value of plan assets at end of year | 0 | 0 | 0
Funded (unfunded) status at year end | (6,083) | (7,034) |
Accumulated benefit obligation | 6,100 | 7,000 |
Amounts recognized in Balance Sheet [Abstract] |  |  |
Funded (unfunded) status at year end | (6,083) | (7,034) |
Components of net periodic cost (benefit) [Abstract] |  |  |
Service cost | 7 | 10 | 12
Interest cost | 272 | 327 | 357
Expected return on plan assets | 0 | 0 | 0
Amortization of prior service cost | 50 | 51 | 51
Amortization of unrecognized net loss | 0 | 124 | 87
Net periodic pension cost (benefit) | 329 | 512 | 507
Other changes in plan assets and benefit obligation recognized in OCI (pre-tax) [Abstract] |  |  |
Net (gain) loss | (720) | (762) | 388
Prior service cost | 0 | 0 | 286
Amortization of prior service (cost) | (50) | (51) | (51)
Amortization of unrecognized net (loss) | 0 | (124) | (87)
Total recognized in OCI | (770) | (937) | 536
Total recognized in net periodic benefit cost and OCI pre-tax | (441) | (425) | $ 1,043
Estimate future benefit payments [Abstract] |  |  |
2020 | 497 |  |
2021 | 464 |  |
2022 | 462 |  |
2023 | 457 |  |
2024 | 451 |  |
2025 - 2029 | 2,070 |  |
Employer voluntary contribution to plan | 0 | 0 |
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 | $ (6,083) | $ (7,034) |

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 Amount of voluntary contribution received by defined benefit plan from employer which increases plan assets. + 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 of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118255775&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=118255775&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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