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Employee Benefit Plans: AOCI Amounts (After-Tax) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net (gain) loss | $ 4,398 | $ 5,511
Prior service cost (gain) | (46) | 0
Total amounts included in AOCI, after-tax not yet recognized as components of net periodic expense | 4,352 | 5,511
Supplemental Employee Retirement Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net (gain) loss | 7,159 | 9,323
Prior service cost (gain) | 0 | 0
Total amounts included in AOCI, after-tax not yet recognized as components of net periodic expense | 7,159 | 9,323
Other Postretirement Benefits Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net (gain) loss | (308) | 100
Prior service cost (gain) | (27) | (144)
Total amounts included in AOCI, after-tax not yet recognized as components of net periodic expense | $ (335) | $ (44)

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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 http://asc.fasb.org/extlink&oid=124509347&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 http://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 http://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 http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 + Details
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