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SERP Benefits Table (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | $ 16,200 |  |
Fair value of plan assets at end of year | 16,600 | $ 16,200 |
Supplemental Executive Retirement Plans [Member] |  |  |
Change in accumulated benefit obligation |  |  |
Benefit obligation at beginning of year | 15,749 | 14,177 | $ 13,290
Service cost | 459 | 423 | 395
Interest cost | 533 | 547 | 539
Actuarial loss (gain) | (1,344) | 969 | 273
Accumulated benefit obligation at end of year | 14,963 | 15,749 | 14,177
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (434) | (367) | (320)
Change in plan assets |  |  |
Employer contribution | 434 | 367 | 320
Defined Benefit Plan, Plan Assets, Benefits Paid | (434) | (367) | (320)
Funded status at end of year | (14,963) | (15,749) | (14,177)
Assets | 0 | 0 | 0
Liabilities | (14,963) | (15,749) | (14,177)
Funded status at end of year | (14,963) | (15,749) | (14,177)
Amounts recognized in accumulated other comprehensive income (“AOCI”) |  |  |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax | 1,705 | 3,465 | 2,830
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax | 770 | 1,047 | 1,323
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax | 2,475 | 4,512 | 4,153
Information for plans with an accumulated benefit obligation in excess of plan assets |  |  |
Projected benefit obligation | 14,963 | 15,749 | 14,177
Accumulated benefit obligation | 14,963 | 15,749 | 14,177
Net periodic benefit cost |  |  |
Service cost | 459 | 423 | 395
Interest cost | 533 | 547 | 539
Amortization of prior service cost | 276 | 276 | 276
Recognized net actuarial loss | 415 | 334 | 303
Net periodic benefit cost | 1,683 | 1,580 | 1,513
Amounts in accumulated other comprehensive income expected to be recognized in net periodic benefit cost over next fiscal year |  |  |
Net actuarial loss | 41 | 415 | 338
Net prior service cost | $ 276 | $ 276 | $ 276
Minimum [Member] | Supplemental Executive Retirement Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 3.24% | 2.48% | 2.49%
Amounts in accumulated other comprehensive income expected to be recognized in net periodic benefit cost over next fiscal year |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate | 2.48% | 2.49% | 2.49%
Maximum [Member] | Supplemental Executive Retirement Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 4.09% | 3.45% | 3.94%
Amounts in accumulated other comprehensive income expected to be recognized in net periodic benefit cost over next fiscal year |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate | 3.45% | 3.94% | 4.16%

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- Definition Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 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 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://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 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 (b)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + 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 (h)(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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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