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Employee Benefit Plans: AOCI Amounts (After-Tax) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net (gain) loss | $ 5,179 | $ 4,398
Prior service cost (gain) | (39) | (46)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax, Total | 5,140 | 4,352
Supplemental Employee Retirement Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net (gain) loss | 1,565 | 7,159
Prior service cost (gain) | 0 | 0
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax, Total | 1,565 | 7,159
Other Postretirement Benefits Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net (gain) loss | (667) | (308)
Prior service cost (gain) | 74 | (27)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax, Total | $ (593) | $ (335)

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- Definition Amount, after 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 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount, after 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 https://asc.fasb.org/extlink&oid=123447040&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 https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 + Details
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