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Employee Benefit Plans - Summary of funded status of Retirement Income Plan and amounts recognized in consolidated balance sheets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation at end of year | $ 43,417 | $ 46,397 |
Retirement Income Plan |  |  |
CHANGE IN PROJECTED BENEFIT OBLIGATION: |  |  |
Benefit obligation at beginning of year | 46,397 | 44,315 |
Service cost | 0 | 0 | $ 0
Interest cost | 1,832 | 1,932 | 2,006
Amendments | 0 | 0 |
Actuarial loss | (2,658) | 2,206 |
Benefits paid | 2,154 | 2,056 |
Projected benefit obligation at end of year | 43,417 | 46,397 | 44,315
CHANGE IN PLAN ASSETS: |  |  |
Fair value of plan assets at beginning of year | 38,050 | 34,745 |
Actual return on plan assets | (2,532) | 5,361 |
Employer contribution | 5,000 | 0 |
Benefits paid | (2,154) | (2,056) |
Fair value of plan assets at end of year | 38,364 | 38,050 | 34,745
Funded status at end of year | (5,053) | (8,347) |
AMOUNTS (PRE-TAX) RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) CONSIST OF: |  |  |
Net loss | 24,650 | 22,762 |
Prior service cost (credit) | 0 | 0 |
Net transition obligation (asset) | 0 | 0 | $ 0
Before-tax amount | $ 24,650 | $ 22,762 |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 + 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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