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Benefit Plans - Defined Benefit Plans - Amounts Recognized in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Split-Dollar Life Insurance Benefit Plan |  |
Amounts Recognized in Accumulated Other Comprehensive Loss |  |
Net actuarial loss | $ 5,170 | $ 3,776
Prior transition obligation | 970 | 1,059
Accumulated other comprehensive loss | 6,140 | 4,835
Supplemental Retirement Plan |  |
Amounts Recognized in Accumulated Other Comprehensive Loss |  |
Net actuarial loss | $ 12,445 | $ 9,714

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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=121641772&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=118255775&loc=d3e1928-114920 + Details
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