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SERP Benefits Table (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | $ 19,100 |  |
Fair value of plan assets at end of year | 20,300 | $ 19,100 |
Supplemental Executive Retirement Plans [Member] |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation at beginning of year | 20,752 | 17,361 | $ 14,963
Service cost | 574 | 505 | 433
Interest cost | 424 | 518 | 601
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | (1,777) | 2,843 | 1,850
Accumulated benefit obligation at end of year | 19,498 | 20,752 | 17,361
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (475) | (475) | (486)
Change in plan assets |  |  |
Employer contribution | 475 | 475 | 486
Defined Benefit Plan, Plan Assets, Benefits Paid | (475) | (475) | (486)
Funded status at end of year | (19,498) | (20,752) | (17,361)
Assets for Plan Benefits, Defined Benefit Plan | 0 | 0 | 0
Liabilities | (19,498) | (20,752) | (17,361)
Funded status at end of year | (19,498) | (20,752) | (17,361)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax [Abstract] |  |  |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax | 3,002 | 5,881 | 3,509
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax | 43 | 218 | 494
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax | 3,045 | 6,099 | 4,003
Information for plans with an accumulated benefit obligation in excess of plan assets |  |  |
Projected benefit obligation | 19,498 | 20,752 | 17,361
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation | 19,498 | 20,752 | 17,361
Net periodic benefit cost |  |  |
Service cost | 574 | 505 | 433
Interest cost | 424 | 518 | 601
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | 174 | 276 | 276
Recognized net actuarial loss | 1,103 | 471 | 46
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | $ 2,275 | $ 1,770 | $ 1,356
Minimum [Member] | Supplemental Executive Retirement Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 1.28% | 0.43% | 2.00%
Defined Benefit Plan, Expected Amortization, Next Fiscal Year [Abstract] |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate | 0.43% | 2.00% | 3.24%
Maximum [Member] | Supplemental Executive Retirement Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 2.57% | 2.18% | 3.04%
Defined Benefit Plan, Expected Amortization, Next Fiscal Year [Abstract] |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate | 2.18% | 3.04% | 4.09%

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- Definition Amount of net periodic benefit cost (credit) for 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 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 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=123450688&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920 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=123450688&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920 + Details
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- Definition Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920 + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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