XML 67 R55.htm IDEA: XBRL DOCUMENT
v3.25.1

Property and Casualty Insurance Activity - Schedule of Material Terms for Reinsurance Treaties (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 7 Months Ended | 12 Months Ended | 18 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2025 USD ($) h | Dec. 31, 2025 USD ($) | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Jun. 30, 2024 USD ($) | Apr. 30, 2025 USD ($) | Dec. 31, 2025 USD ($) | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($)
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Single risk coverage | $ 9,000 |  |  |  |  |  |  |  |  |  |
Catastrophe coverage, multiple of per occurrence limitation | 2 |  |  |  |  |  |  |  |  |  |
Catastrophic coverage, first layer | $ 5,000 |  |  |  |  |  |  |  |  |  |
Excess of catastrophic coverage, first layer | $ 5,000 |  |  |  |  |  |  |  |  |  |
Catastrophe coverage, number of consecutive hours | h | 168 |  |  |  |  |  |  |  |  |  |
Reinstatement of premium protection |  |  |  |  |  |  |  |  |  |  | $ 50,000
Excess of catastrophe coverage |  |  |  |  |  |  |  |  |  |  | $ 10,000
Underlying XOL treaty, reinsurance coverage (percent) |  |  |  |  |  |  |  |  | 50.00% |  |
Limited retention |  |  |  |  |  |  |  |  | $ 4,800 |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reinstatement of premium protection |  |  |  |  |  | $ 4,500 |  |  |  |  |
Excess of catastrophe coverage |  |  |  |  |  | $ 5,500 |  |  |  |  |
Underlying XOL treaty, reinsurance coverage (percent) |  |  |  |  |  | 71.00% |  |  |  |  |
Catastrophe reinsurance coverage, (percent) |  |  |  |  |  | 71.00% |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Direct loss | $ 3,500 |  |  |  |  |  |  |  |  |  |
Reduces retention |  |  |  |  |  |  |  |  | 530 |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Direct loss | $ 9,000 |  |  |  |  |  |  |  |  |  |
Reduces retention |  |  |  |  |  |  |  |  | $ 730 |  |
Forecast |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reinstatement of premium protection |  |  |  |  |  |  |  | $ 50,000 |  | $ 400 |
Excess of catastrophe coverage |  |  |  |  |  |  |  | $ 10,000 |  | $ 600 |
Underlying XOL treaty, reinsurance coverage (percent) |  |  |  |  |  |  |  |  |  | 50.00% |
Limited retention |  |  |  |  |  |  | $ 5,200 |  |  |  |
Forecast | Minimum |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Retention increases |  |  |  |  |  |  | 530 |  |  |  |
Forecast | Maximum |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Retention increases |  |  |  |  |  |  | $ 640 |  |  |  |
Catastrophe Reinsurance: |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Initial loss subject to personal lines quota share treaty |  |  |  | $ 10,000 | $ 10,000 |  |  |  |  |  |
Risk retained per catastrophe occurrence |  |  |  | 4,750 | 9,500 |  |  |  |  |  |
Catastrophe loss coverage in excess of quota share coverage |  |  |  | $ 275,000 | $ 315,000 |  |  |  |  |  |
Reinstatement premium protection |  |  |  | Yes | Yes |  |  |  |  |  |
Catastrophe Reinsurance: | Forecast |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Initial loss subject to personal lines quota share treaty |  | $ 10,000 | $ 10,000 |  |  |  |  |  |  |  |
Risk retained per catastrophe occurrence |  |  | 4,250 |  |  |  |  |  |  |  |
Catastrophe loss coverage in excess of quota share coverage |  |  | $ 275,000 |  |  |  |  |  |  |  |
Reinstatement premium protection |  |  | Yes |  |  |  |  |  |  |  |
Personal Lines: |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Quota share treaty percent ceded |  |  |  | 27.00% | 27.00% |  |  |  | 27.00% |  |
Risk retained on initial $1,000,000 of losses |  |  |  | $ 730 | $ 730 |  |  |  |  |  |
Losses per occurrence subject to quota share reinsurance coverage |  |  |  | 1,000 | 1,000 |  |  |  |  |  |
Excess of loss coverage and facultative facility coverage |  |  |  | 8,400 | 8,400 |  |  |  |  |  |
in excess of 1 |  |  |  | 600 | 600 |  |  |  |  |  |
Total reinsurance coverage per occurrence |  |  |  | 8,470 | 8,470 |  |  |  |  |  |
Losses per occurrence subject to reinsurance coverage |  |  |  | $ 9,000 | $ 9,000 |  |  |  |  |  |
Quota share treaty percent excluded from percent ceded |  |  |  |  |  |  |  |  | 22.00% |  |
Personal Lines: | Forecast |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Quota share treaty percent ceded |  | 16.00% | 16.00% |  |  |  | 16.00% |  |  |  |
Risk retained on initial $1,000,000 of losses |  | $ 840 | $ 840 |  |  |  |  |  |  |  |
Losses per occurrence subject to quota share reinsurance coverage |  | 1,000 | 1,000 |  |  |  |  |  |  |  |
Excess of loss coverage and facultative facility coverage |  |  | 8,400 |  |  |  |  |  |  |  |
in excess of 1 |  |  | 600 |  |  |  |  |  |  |  |
Total reinsurance coverage per occurrence |  | 160 | 8,360 |  |  |  |  |  |  |  |
Losses per occurrence subject to reinsurance coverage |  | $ 1,000 | $ 9,000 |  |  |  |  |  |  |  |
Quota share treaty percent excluded from percent ceded |  |  |  |  |  |  | 6.00% |  |  |  |

X
- Definition Excess of catastrophe coverage + References No definition available. + Details
Name: | king_CatastropheCoverage
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Catastrophe Coverage, Duration of Occurrence + References No definition available. + Details
Name: | king_CatastropheCoverageDurationOfOccurrence
Namespace Prefix: | king_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Catastrophe Coverage, Multiple of Per Occurrence Limitation + References No definition available. + Details
Name: | king_CatastropheCoverageMultipleOfPerOccurrenceLimitation
Namespace Prefix: | king_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Catastrophe loss coverage in excess of quota share coverage + References No definition available. + Details
Name: | king_CatastropheLossCoverageInExcessOfQuotaShareCoverageWinterStormCoverage1
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Catastrophe Reinsurance Coverage, Percent + References No definition available. + Details
Name: | king_CatastropheReinsuranceCoveragePercent
Namespace Prefix: | king_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Catastrophic Coverage, First Layer + References No definition available. + Details
Name: | king_CatastrophicCoverageFirstLayer
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Direct loss + References No definition available. + Details
Name: | king_DirectLosses
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Excess of Catastrophic Coverage, First Layer + References No definition available. + Details
Name: | king_ExcessOfCatastrophicCoverageFirstLayer
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Excess of loss coverage and facultative facility coverage + References No definition available. + Details
Name: | king_ExcessOfLossCoverageAboveRiskRetained
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition in excess of 1 + References No definition available. + Details
Name: | king_InExcessOf1
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Initial loss subject to personal lines quota share treaty + References No definition available. + Details
Name: | king_InitialLossSubjectToPersonalLinesQuotaShareTreaty
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Losses per occurrence subject to reinsurance coverage + References No definition available. + Details
Name: | king_LossesPerOccurrenceSubjectReinsuranceCoverage
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Losses per occurrence subject to quota share reinsurance coverage + References No definition available. + Details
Name: | king_LossesPerOccurrenceSubjectToQuotaShareReinsuranceCoverage
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Quota Share Treaty Percent Ceded + References No definition available. + Details
Name: | king_QuotaShareTreatyPercentCeded
Namespace Prefix: | king_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Quota Share Treaty Percent Excluded for Named Catastrophe from Percent Ceded + References No definition available. + Details
Name: | king_QuotaShareTreatyPercentExcludedForNamedCatastropheFromPercentCeded
Namespace Prefix: | king_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reinstatement of premium protection + References No definition available. + Details
Name: | king_ReinstatementOfPremiumProtectionAmount
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Reinstatement premium protection + References No definition available. + Details
Name: | king_ReinstatementPremiumProtection
Namespace Prefix: | king_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Retention Increases + References No definition available. + Details
Name: | king_RetentionIncreases
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Limited retention + References No definition available. + Details
Name: | king_RetentionLimitedUnderExcessOfLossTreaty
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Reduces retention + References No definition available. + Details
Name: | king_RetentionReduced
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Risk retained on initial $1,000,000 of losses + References No definition available. + Details
Name: | king_RiskRetained1
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Risk retained per catastrophe occurrence + References No definition available. + Details
Name: | king_RiskRetainedPerCatastropheOccurrence
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Single risk coverage + References No definition available. + Details
Name: | king_SingleRiskMaximumCoverage
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Total reinsurance coverage per occurrence + References No definition available. + Details
Name: | king_TotalReinsuranceCoveragePerOccurrence
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Underlying Excess of Loss Treaty, Reinsurance Coverage, Percent + References No definition available. + Details
Name: | king_UnderlyingExcessOfLossTreatyReinsuranceCoveragePercent
Namespace Prefix: | king_
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_EffectsOfReinsuranceLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
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: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=us-gaap_CatastropheMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=king_PropertyAndCasualtyPersonalInsuranceProductLinesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |