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Postretirement Benefit Plans (Expected Benefit Payments) (Detail) | 12 Months Ended
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Dec. 31, 2016 USD ($)
Defined Benefit Postretirement Health And Life Coverage [Member] |
Defined Benefit Plan Disclosure [Line Items] |
1/1/2017 to 12/31/2017 | $ 73,000
1/1/2018 to 12/31/2018 | 64,000
1/1/2019 to 12/31/2019 | 61,000
1/1/2020 to 12/31/2020 | 56,000
1/1/2021 to 12/31/2021 | 30,000
1/1/2022 to 12/31/2026 | 156,000
Defined contribution plan, employer discretionary contribution amount | 73,000
Director's Retirement Plan [Member] |
Defined Benefit Plan Disclosure [Line Items] |
1/1/2017 to 12/31/2017 | 94,000
1/1/2018 to 12/31/2018 | 96,000
1/1/2019 to 12/31/2019 | 96,000
1/1/2020 to 12/31/2020 | 98,000
1/1/2021 to 12/31/2021 | 108,000
1/1/2022 to 12/31/2026 | 464,000
Defined contribution plan, employer discretionary contribution amount | $ 94,000

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- Definition Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of benefits for defined benefit plan expected to be paid in fifth fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of benefits for defined benefit plan expected to be paid in second fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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