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Pension Plans and Other Postretirement Benefits - Defined Benefit Plan and Supplemental Retirement Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan |  |  |
Change in benefit obligation: |  |  |
Benefit obligations at beginning of year | $ 29,407 | $ 31,233 | $ 34,279
Service cost | 650 | 650 | 450
Interest cost | 1,091 | 1,244 | 1,189
Plan amendments | 0 | 0 | 0
Actuarial loss (gain) | 721 | 220 | 1,371
Benefits paid | (1,995) | (3,500) | (3,314)
Settlements | 0 | 0 | 0
Benefit obligations at beginning of year | 28,432 | 29,407 | 31,233
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 25,446 | 27,667 | 31,408
Actual return on plan assets | 2,909 | 1,766 | 200
Employer contributions | 0 | 0 | 0
Benefits paid | (1,995) | (3,500) | (3,314)
Expenses paid | (517) | (487) | (627)
Settlements | 0 | 0 | 0
Fair value of plan assets at end of year | 25,843 | 25,446 | 27,667
Funded status | 2,589 | 3,961 | 3,566
Prepaid (accrued) benefit expense | 8,016 | 8,653 | 9,265
Total amount recognized in Consolidated Balance Sheets, all in Other liabilities | (2,589) | (3,961) | (3,566)
Amounts recognized in accumulated other comprehensive income (loss) ("AOCI"): |  |  |
Prior service cost | 0 | 0 | 0
Net actuarial loss | 10,605 | 12,613 | 12,831
Total amount recognized in AOCI | 10,605 | 12,613 | 12,831
Information for pension plans with an accumulated benefit obligation greater than plan assets: |  |  |
Projected benefit obligation | 28,432 | 29,407 | 31,233
Accumulated benefit obligation | 28,432 | 29,407 | 31,233
Fair value of plan assets | 25,843 | 25,446 | 27,667
Supplemental Defined Benefit Plans |  |  |
Change in benefit obligation: |  |  |
Benefit obligations at beginning of year | 16,847 | 17,004 | 18,524
Service cost | 0 | 0 | 0
Interest cost | 631 | 687 | 654
Plan amendments | 0 | 0 | 0
Actuarial loss (gain) | (805) | (488) | 845
Benefits paid | (1,451) | (1,332) | (1,329)
Settlements | 0 | 0 | 0
Benefit obligations at beginning of year | 16,832 | 16,847 | 17,004
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 0 | 0 | 0
Actual return on plan assets | 0 | 0 | 0
Employer contributions | 1,451 | 1,332 | 1,329
Benefits paid | (1,451) | (1,332) | (1,329)
Expenses paid | 0 | 0 | 0
Settlements | 0 | 0 | 0
Fair value of plan assets at end of year | 0 | 0 | 0
Funded status | 16,832 | 16,847 | 17,004
Prepaid (accrued) benefit expense | (10,648) | (11,210) | (11,622)
Total amount recognized in Consolidated Balance Sheets, all in Other liabilities | (16,832) | (16,847) | (17,004)
Amounts recognized in accumulated other comprehensive income (loss) ("AOCI"): |  |  |
Prior service cost | 0 | 0 | 0
Net actuarial loss | 6,184 | 5,637 | 5,382
Total amount recognized in AOCI | 6,184 | 5,637 | 5,382
Information for pension plans with an accumulated benefit obligation greater than plan assets: |  |  |
Projected benefit obligation | 16,832 | 16,847 | 17,004
Accumulated benefit obligation | 16,832 | 16,847 | 17,004
Fair value of plan assets | $ 0 | $ 0 | $ 0

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- Definition Defined benefit plan prepaid (accrued) benefit expense. + References No definition available. + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 (b)(1) -URI http://asc.fasb.org/extlink&oid=82843861&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + 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 (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + 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 (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + 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 (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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