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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan |  |  |
Change in benefit obligation: |  |  |
Benefit obligations at beginning of year | $ 28,432 | $ 29,407 | $ 31,233
Service cost | 650 | 650 | 650
Interest cost | 947 | 1,091 | 1,244
Plan amendments | 0 | 0 | 0
Actuarial loss (gain) | 2,208 | 721 | 220
Benefits paid | (2,746) | (1,995) | (3,500)
Settlements | 0 | 0 | 0
Benefit obligations at beginning of year | 25,075 | 28,432 | 29,407
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 25,843 | 25,446 | 27,667
Actual return on plan assets | (640) | 2,909 | 1,766
Employer contributions | 0 | 0 | 0
Benefits paid | (2,746) | (1,995) | (3,500)
Expenses paid | (367) | (517) | (487)
Settlements | 0 | 0 | 0
Fair value of plan assets at end of year | 22,090 | 25,843 | 25,446
Funded status | 2,985 | 2,589 | 3,961
Prepaid (accrued) benefit expense | 7,425 | 8,016 | 8,653
Total amount recognized in Consolidated Balance Sheets, all in Other liabilities | (2,985) | (2,589) | (3,961)
Amounts recognized in accumulated other comprehensive income (loss) ("AOCI"): |  |  |
Prior service cost | 0 | 0 | 0
Net actuarial loss | 10,410 | 10,605 | 12,613
Total amount recognized in AOCI | 10,410 | 10,605 | 12,613
Information for pension plans with an accumulated benefit obligation greater than plan assets: |  |  |
Projected benefit obligation | 25,075 | 28,432 | 29,407
Accumulated benefit obligation | 25,075 | 28,432 | 29,407
Fair value of plan assets | 22,090 | 25,843 | 25,446
Supplemental Defined Benefit Plans |  |  |
Change in benefit obligation: |  |  |
Benefit obligations at beginning of year | 16,832 | 16,847 | 17,004
Service cost | 0 | 0 | 0
Interest cost | 566 | 631 | 687
Plan amendments | 0 | 0 | 0
Actuarial loss (gain) | 789 | (805) | (488)
Benefits paid | (1,205) | (1,451) | (1,332)
Settlements | 0 | 0 | 0
Benefit obligations at beginning of year | 15,404 | 16,832 | 16,847
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 | 1,205 | 1,451 | 1,332
Benefits paid | (1,205) | (1,451) | (1,332)
Expenses paid | 0 | 0 | 0
Settlements | 0 | 0 | 0
Fair value of plan assets at end of year | 0 | 0 | 0
Funded status | 15,404 | 16,832 | 16,847
Prepaid (accrued) benefit expense | (10,320) | (10,648) | (11,210)
Total amount recognized in Consolidated Balance Sheets, all in Other liabilities | (15,404) | (16,832) | (16,847)
Amounts recognized in accumulated other comprehensive income (loss) ("AOCI"): |  |  |
Prior service cost | 0 | 0 | 0
Net actuarial loss | 5,084 | 6,184 | 5,637
Total amount recognized in AOCI | 5,084 | 6,184 | 5,637
Information for pension plans with an accumulated benefit obligation greater than plan assets: |  |  |
Projected benefit obligation | 15,404 | 16,832 | 16,847
Accumulated benefit obligation | 15,404 | 16,832 | 16,847
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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 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=114867106&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=114867106&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=108410482&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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