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Employee Benefit Plans (Schedule of Net Period Benefit Cost and Other Amounts Recognized in Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Changes in funded status recognized in other comprehensive loss, before taxes |  |  |
Total recognized in OCI, before taxes | $ 605 | $ 1,671 | $ (2,332)
Supplemental Executive Retirement Plan [Member] |  |  |
Net period benefit cost |  |  |
Service cost | 464 | 395 | 446
Interest cost | 460 | 523 | 488
Recognized net actuarial loss(2) | 623 | 240 | 561
Net periodic benefit cost | 1,547 | 1,158 | 1,495
Changes in funded status recognized in other comprehensive loss, before taxes |  |  |
Net actuarial loss (gain) arising during period | 911 | 1,524 | (1,534)
Amortization of net unrecognized actuarial loss | (623) | (240) | (561)
Total recognized in OCI, before taxes | 288 | 1,284 | (2,095)
Total recognized in net periodic benefit cost and OCI, before taxes | 1,835 | 2,442 | (600)
Other Postretirement Benefits Plan [Member] |  |  |
Net period benefit cost |  |  |
Service cost | 28 | 48 | 46
Interest cost | 123 | 148 | 132
Recognized net actuarial loss(2) | 78 | 31 | 52
Amortization of prior service credit(2) | (24) | (24) | (24)
Net periodic benefit cost | 205 | 203 | 206
Changes in funded status recognized in other comprehensive loss, before taxes |  |  |
Net actuarial loss (gain) arising during period | 371 | 394 | (209)
Amortization of net unrecognized actuarial loss | (78) | (31) | (52)
Amortization of prior service credit | 24 | 24 | 24
Total recognized in OCI, before taxes | 317 | 387 | (237)
Total recognized in net periodic benefit cost and OCI, before taxes | $ 522 | $ 590 | $ (31)

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit 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 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: 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 4: 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=118257860&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -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 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 4: 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=118257860&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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