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Postretirement Benefit Plans (Net Funded Status) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Change in benefit obligations: |  |  |
Change in benefit obligations: Settlement (gain) loss | $ 34,000 | $ 737,000 |
Change in fair value of plan assets: |  |  |
Funded status at year end | 183,000 | 345,000 |
Defined Benefit Postretirement Health And Life Coverage [Member] |  |  |
Change in benefit obligations: |  |  |
Benefit obligations | 475,000 | 508,000 |
Change in benefit obligations: Service cost | 3,000 | 4,000 | $ 4,000
Change in benefit obligations: Interest cost | 17,000 | 17,000 | 20,000
Change in benefit obligations: Change in experience | (13,000) | (38,000) |
Change in benefit obligations: Change in assumptions | 34,000 | (17,000) |
Change in benefit obligations: Change due to plan amendment |  | 60,000 |
Change in benefit obligations/fair value of plan assets: Benefit payments | (112,000) | (59,000) |
Benefit obligations | 404,000 | 475,000 | 508,000
Change in fair value of plan assets: |  |  |
Change in fair value of plan assets: Employer contributions | 112,000 | 59,000 |
Change in benefit obligations/fair value of plan assets: Benefit payments | (112,000) | (59,000) |
Funded status at year end | (404,000) | (475,000) |
Director's Retirement Plan [Member] |  |  |
Change in benefit obligations: |  |  |
Benefit obligations | 1,100,000 | 1,116,000 |
Change in benefit obligations: Service cost | 51,000 | 36,000 | 35,000
Change in benefit obligations: Interest cost | 42,000 | 38,000 | 43,000
Change in benefit obligations: Actuarial gain (loss) | (17,000) | 5,000 |
Change in benefit obligations: Change in assumptions | (12,000) | (5,000) |
Change in benefit obligations/fair value of plan assets: Benefit payments | (87,000) | (90,000) |
Benefit obligations | 1,077,000 | 1,100,000 | 1,116,000
Change in fair value of plan assets: |  |  |
Change in fair value of plan assets: Employer contributions | 87,000 | 90,000 |
Change in benefit obligations/fair value of plan assets: Benefit payments | (87,000) | (90,000) |
Funded status at year end | (1,077,000) | (1,100,000) |
Defined Benefit Pension Plan [Member] |  |  |
Change in benefit obligations: |  |  |
Benefit obligations | 5,163,000 | 10,542,000 |
Change in benefit obligations: Service cost | 92,000 | 287,000 |
Change in benefit obligations: Interest cost | 217,000 | 392,000 |
Change in benefit obligations: Settlement (gain) loss | (91,000) | 118,000 |
Change in benefit obligations: Actuarial gain (loss) | 655,000 | (2,271,000) |
Change in benefit obligations/fair value of plan assets: Settlement payments | (363,000) | (3,828,000) |
Change in benefit obligations/fair value of plan assets: Benefit payments | (86,000) | (77,000) |
Benefit obligations | 5,587,000 | 5,163,000 | 10,542,000
Change in fair value of plan assets: |  |  |
Fair value of plan assets | 4,818,000 | 8,121,000 |
Change in fair value of plan assets: Return on plan assets | 498,000 | 57,000 |
Change in fair value of plan assets: Employer contributions | 600,000 | 600,000 |
Change in benefit obligations/fair value of plan assets: Benefit payments | (86,000) | (77,000) |
Change in fair value of plan assets: Administrative expenses | (63,000) | (55,000) |
Change in benefit obligations/fair value of plan assets: Settlement payments | (363,000) | (3,828,000) |
Fair value of plan assets | 5,404,000 | 4,818,000 | $ 8,121,000
Funded status at year end | $ (183,000) | $ (345,000) |

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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 Amount of payment to participant of defined benefit plan which decreases benefit obligation. 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -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 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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- Definition Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement. + 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)(10) -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 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + 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 (d)(iv)(01) -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 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: 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 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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