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Certain Information Regarding Health and Welfare Plan (Detail) - Post-Retirement Benefits - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | $ 13,583 | $ 16,349 |
Interest cost | 512 | 513 | $ 577
Actuarial gain | (1,233) | (2,248) |
Premiums and claims paid | (964) | (1,031) |
Benefit obligation at end of year | 11,898 | 13,583 | $ 16,349
Change in Plan Assets: |  |  |
Employer contribution | 964 | 1,031 |
Premiums and claims paid | (964) | (1,031) |
Funded status (included in "Other liabilities") | (11,898) | (13,583) |
Changes recognized in other comprehensive income for the year ended December 31: |  |  |
Amortization of prior service cost | 249 | 249 |
Amortization of actuarial gain | (124) | (309) |
Net actuarial (gain) loss arising during the year | (1,234) | (2,248) |
Total recognized in other comprehensive income for the year (pre-tax) | (1,109) | (2,308) |
Accumulated other comprehensive loss (pre-tax) not yet recognized in net periodic benefit cost at December 31: |  |  |
Prior service cost | (536) | (785) |
Actuarial loss, net | 1,466 | 2,823 |
Total accumulated other comprehensive income (pre-tax) | $ 930 | $ 2,038 |

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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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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation 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=118930883&loc=SL7669686-108580 Reference 2: 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 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive 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 (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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