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Employee Benefit Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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%
Interest rate of credit for cash balance plan | 1.62% | 2.28% | 3.36%
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%
Interest rate of credit for cash balance plan | 2.28% | 3.36% | 2.80%
Other changes in plan assets and benefit obligation recognized in OCI (pre-tax) [Abstract] |  |  |
Net (gain) loss | $ (429) | $ (5,331) | $ 12,457
Amortization of unrecognized net (loss) | $ 107 | $ 1,333 | $ (3,038)
Estimate future benefit payments [Abstract] |  |  |
Ultimate health care cost trend rate | 3.80% |  |
Actual plan asset allocations [Abstract] |  |  |
Actual plan asset allocations | 100.00% | 100.00% |
Minimum [Member] |  |  |
Assumptions used to determine benefit obligations [Abstract] |  |  |
Discount rate | 3.08% | 3.69% | 4.79%
Assumptions used to determine net periodic pension cost [Abstract] |  |  |
Discount rate | 3.69% | 4.79% | 4.20%
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 | 3.25% | 3.73% | 4.80%
Assumptions used to determine net periodic pension cost [Abstract] |  |  |
Discount rate | 3.73% | 4.80% | 4.21%
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 | $ 26,108 | $ 28,334 |
Prior service cost | 378 | 491 |
Total amounts recognized in AOCI (pre-tax) | 26,486 | 28,825 |
Change in benefit obligation [Roll Forward] |  |  |
Benefit obligation at beginning of year | 90,586 | 85,134 |
Service cost | 1,840 | 1,723 | $ 1,659
Interest cost | 3,237 | 3,942 | 3,645
Plan participants' contributions | 0 | 0 |
Actuarial loss (gain) | 3,411 | 6,030 |
Curtailments | (67) | 0 |
Benefits paid | (8,813) | (6,243) |
Projected benefit obligation at end of year | 90,194 | 90,586 | 85,134
Change in plan assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 122,995 | 109,746 |
Gain on plan assets | 12,449 | 18,120 |
Employer contributions | 1,932 | 1,372 |
Plan participants' contributions | 0 | 0 |
Benefits paid | (8,813) | (6,243) |
Fair value of plan assets at end of year | 128,563 | 122,995 | 109,746
Funded (unfunded) status at year end | 38,369 | 32,409 |
Accumulated benefit obligation | 90,200 | 90,600 |
Amounts recognized in Balance Sheet [Abstract] |  |  |
Funded (unfunded) status at year end | 38,369 | 32,409 |
Components of net periodic (benefit) cost [Abstract] |  |  |
Service cost | 1,840 | 1,723 | 1,659
Interest cost | 3,237 | 3,942 | 3,645
Expected return on plan assets | (8,410) | (7,480) | (8,478)
Additional gain due to curtailment | (74) | 0 | 0
Amortization of prior service cost | 41 | 43 | 40
Amortization of unrecognized net loss | 1,535 | 2,593 | 930
Net periodic pension (benefit) cost | (1,831) | 821 | (2,204)
Other changes in plan assets and benefit obligation recognized in OCI (pre-tax) [Abstract] |  |  |
Net (gain) loss | (628) | (4,611) | 12,882
Prior service cost | 0 | 0 | 337
Additional gain due to curtailment | 7 | 0 | 0
Amortization of prior service cost | (41) | (43) | (40)
Amortization of unrecognized net (loss) | (1,535) | (2,593) | (930)
Total recognized in OCI | (2,197) | (7,247) | 12,249
Total recognized in net periodic (benefit) cost and OCI, pre-tax | (4,028) | (6,426) | 10,045
Estimate future benefit payments [Abstract] |  |  |
2021 | 6,910 |  |
2022 | 6,977 |  |
2023 | 6,807 |  |
2024 | 7,083 |  |
2025 | 7,409 |  |
2026 - 2030 | 33,579 |  |
Employer voluntary contribution to plan | 0 | 0 |
Pension Benefits [Member] | Other Assets [Member] |  |  |
Amounts recognized in Balance Sheet [Abstract] |  |  |
Assets recognized | 57,456 | 51,988 |
Pension Benefits [Member] | Other Liabilities [Member] |  |  |
Amounts recognized in Balance Sheet [Abstract] |  |  |
Liabilities recognized | $ (19,087) | $ (19,579) |
Pension Benefits [Member] | Cash and Cash Equivalents [Member] |  |  |
Actual plan asset allocations [Abstract] |  |  |
Actual plan asset allocations | 3.00% | 3.00% |
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 | 38.00% | 40.00% |
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 | 59.00% | 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 | $ 317 | $ 125 |
Prior service cost | 43 | 94 |
Total amounts recognized in AOCI (pre-tax) | 360 | 219 |
Change in benefit obligation [Roll Forward] |  |  |
Benefit obligation at beginning of year | 6,083 | 7,034 |
Service cost | 8 | 7 | 10
Interest cost | 213 | 272 | 327
Plan participants' contributions | 173 | 201 |
Actuarial loss (gain) | 191 | (719) |
Curtailments | 0 | 0 |
Benefits paid | (669) | (712) |
Projected benefit obligation at end of year | 5,999 | 6,083 | 7,034
Change in plan assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |
Gain on plan assets | 0 | 0 |
Employer contributions | 496 | 511 |
Plan participants' contributions | 173 | 201 |
Benefits paid | (669) | (712) |
Fair value of plan assets at end of year | 0 | 0 | 0
Funded (unfunded) status at year end | (5,999) | (6,083) |
Accumulated benefit obligation | 6,000 | 6,100 |
Amounts recognized in Balance Sheet [Abstract] |  |  |
Funded (unfunded) status at year end | (5,999) | (6,083) |
Components of net periodic (benefit) cost [Abstract] |  |  |
Service cost | 8 | 7 | 10
Interest cost | 213 | 272 | 327
Expected return on plan assets | 0 | 0 | 0
Additional gain due to curtailment | 0 | 0 | 0
Amortization of prior service cost | 51 | 50 | 51
Amortization of unrecognized net loss | 0 | 0 | 124
Net periodic pension (benefit) cost | 272 | 329 | 512
Other changes in plan assets and benefit obligation recognized in OCI (pre-tax) [Abstract] |  |  |
Net (gain) loss | 192 | (720) | (762)
Prior service cost | 0 | 0 | 0
Additional gain due to curtailment | 0 | 0 | 0
Amortization of prior service cost | (51) | (50) | (51)
Amortization of unrecognized net (loss) | 0 | 0 | (124)
Total recognized in OCI | 141 | (770) | (937)
Total recognized in net periodic (benefit) cost and OCI, pre-tax | 413 | (441) | $ (425)
Estimate future benefit payments [Abstract] |  |  |
2021 | 453 |  |
2022 | 451 |  |
2023 | 448 |  |
2024 | 443 |  |
2025 | 436 |  |
2026 - 2030 | 1,962 |  |
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 | $ (5,999) | $ (6,083) |

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 recognized in net periodic benefit cost (credit) and other comprehensive (income) loss. + References Reference 1: 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 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/disclosureRef -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=121641772&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=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -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, 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/disclosureRef -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=121641772&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://www.xbrl.org/2003/role/disclosureRef -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=121641772&loc=SL7669686-108580 + 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 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation 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/disclosureRef -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 Weighted-average interest crediting rate used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate. + 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 (k)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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