XML 104 R89.htm IDEA: XBRL DOCUMENT
v3.24.0.1

PENSION AND OTHER POSTRETIREMENT PLANS - Schedule of Assumptions Used in Calculating the Net Benefit Obligation (Details) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average discount rate | 4.83% | 5.03% | 2.49%
Rate of increase in future compensation, lump sum assumed interest rates first 5 years | 5.77% | 5.10% | 0.87%
Rate of increase in future compensation, lump sum assumed interest rates next 15 years | 6.14% | 5.83% | 2.74%
Rate of increase in future compensation, lump sum assumed interest rates all future years | 6.19% | 5.68% | 3.16%
Weighted average discount rate | 5.03% | 2.49% | 2.08%
Expected long-term rate of return | 6.50% | 6.50% | 6.50%
SERP Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average discount rate | 4.83% | 5.03% | 2.49%
Weighted average discount rate | 5.03% | 2.49% | 2.08%
Expected long-term rate of return | 6.50% | 6.50% | 6.50%

X
- Definition Represents the lump sum interest rates for all future years. + References No definition available. + Details
Name: | lkfn_LumpSumAssuredInterestRateForAllFutureYears
Namespace Prefix: | lkfn_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the lump sum interest rates for first five years. + References No definition available. + Details
Name: | lkfn_LumpSumAssuredInterestRateForFirstFiveYears
Namespace Prefix: | lkfn_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the lump sum interest rates for next fifteen years. + References No definition available. + Details
Name: | lkfn_LumpSumAssuredInterestRateForNextFifteenYears
Namespace Prefix: | lkfn_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types: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://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
Namespace Prefix: | us-gaap_
Data Type: | dtr-types: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
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
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: |