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Retirement Plans - Expenses Incurred And Charged Against Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension |  | $ (309) | $ (351)
Pension plan termination expense | $ 9,526 |  |
Employee savings plan/ 401(k) | 6,659 | 7,948 | 7,381
Supplemental executive retirement plan | 2,343 | 368 | 1,334
Post-retirement benefits | 144 | 254 | 251
Non-contributory defined benefit pension plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expenses incurred and charged against operations | $ 18,672 | $ 8,261 | $ 8,615

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- Definition Amount of cost of providing special or contractual termination benefits payable from defined benefit plan. + 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 (q) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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