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Pension and Other Postretirement Benefit Plans - Amounts Recognized In AOCI on a Pre-tax Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Net Actuarial loss (gain) | $ 1,628 | $ 2,707 | $ 6,917
Prior Service cost (credit) | (198) | (283) | (356)
Total | 1,430 | 2,424 | 6,561
Retirement Plan [Member] |  |  |
Net Actuarial loss (gain) | 2,273 | 3,238 | 6,166
Prior Service cost (credit) | 0 | 0 | 0
Total | 2,273 | 3,238 | 6,166
Other Postretirement Benefits Plan [Member] |  |  |
Net Actuarial loss (gain) | (265) | 35 | 1,223
Prior Service cost (credit) | (198) | (283) | (368)
Total | (463) | (248) | 855
Directors' Plan [Member] |  |  |
Net Actuarial loss (gain) | (380) | (566) | (472)
Prior Service cost (credit) | 0 | 0 | 12
Total | $ (380) | $ (566) | $ (460)

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- Definition Amount, before 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 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -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 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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