XML 108 R95.htm IDEA: XBRL DOCUMENT
v3.10.0.1

PENSION AND OTHER POSTRETIREMENT PLANS (Schedule of Allocation of Plan Assets) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 60.00% |  |
Weighted Average Expected Long-Term Rate of Return | 8.70% |  |
Debt Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 40.00% |  |
Weighted Average Expected Long-Term Rate of Return | 3.00% |  |
Pension Plans, Defined Benefit [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of Plan Assets | 100.00% | 100.00% |
Weighted Average Expected Long-Term Rate of Return | 6.50% | 6.50% | 7.00%
Pension Plans, Defined Benefit [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of Plan Assets | 59.00% | 63.00% |
Weighted Average Expected Long-Term Rate of Return | 8.69% |  |
Pension Plans, Defined Benefit [Member] | Equity Securities [Member] | Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 55.00% |  |
Pension Plans, Defined Benefit [Member] | Equity Securities [Member] | Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 65.00% |  |
Pension Plans, Defined Benefit [Member] | Debt Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of Plan Assets | 40.00% | 33.00% |
Weighted Average Expected Long-Term Rate of Return | 3.00% |  |
Pension Plans, Defined Benefit [Member] | Debt Securities [Member] | Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 35.00% |  |
Pension Plans, Defined Benefit [Member] | Debt Securities [Member] | Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 45.00% |  |
Pension Plans, Defined Benefit [Member] | Other Debt Obligations [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of Plan Assets | 1.00% | 4.00% |
Weighted Average Expected Long-Term Rate of Return | 0.10% |  |
Pension Plans, Defined Benefit [Member] | Other Debt Obligations [Member] | Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 5.00% |  |
Pension Plans, Defined Benefit [Member] | Other Debt Obligations [Member] | Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 10.00% |  |
Supplemental Employee Retirement Plans, Defined Benefit [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of Plan Assets | 100.00% | 100.00% |
Weighted Average Expected Long-Term Rate of Return | 6.50% | 6.50% | 7.00%
Supplemental Employee Retirement Plans, Defined Benefit [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of Plan Assets | 58.00% | 66.00% |
Weighted Average Expected Long-Term Rate of Return | 8.69% |  |
Supplemental Employee Retirement Plans, Defined Benefit [Member] | Equity Securities [Member] | Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 55.00% |  |
Supplemental Employee Retirement Plans, Defined Benefit [Member] | Equity Securities [Member] | Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 65.00% |  |
Supplemental Employee Retirement Plans, Defined Benefit [Member] | Debt Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of Plan Assets | 40.00% | 32.00% |
Weighted Average Expected Long-Term Rate of Return | 3.00% |  |
Supplemental Employee Retirement Plans, Defined Benefit [Member] | Debt Securities [Member] | Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 35.00% |  |
Supplemental Employee Retirement Plans, Defined Benefit [Member] | Debt Securities [Member] | Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 45.00% |  |
Supplemental Employee Retirement Plans, Defined Benefit [Member] | Other Debt Obligations [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of Plan Assets | 2.00% | 2.00% |
Weighted Average Expected Long-Term Rate of Return | 0.10% |  |
Supplemental Employee Retirement Plans, Defined Benefit [Member] | Other Debt Obligations [Member] | Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 5.00% |  |
Supplemental Employee Retirement Plans, Defined Benefit [Member] | Other Debt Obligations [Member] | Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 10.00% |  |

X
- Definition Target allocation percentages, or range of percentages, considering the major categories of plan assets as of the latest statement of financial position presented (on a weighted-average basis for employers with more than one plan) that are pertinent to an understanding of the plan investment policies and strategies. + References No definition available. + Details
Name: | lkfn_DefinedBenefitPlansTargetAllocationPercentage
Namespace Prefix: | lkfn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + 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 (k)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of plan assets to benefit obligation of defined benefit plan. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanFundedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_DebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_OtherDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |