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Property and Casualty Insurance Activity (Details 5)	13 Months Ended
	Dec. 30, 2020
Quota share treaty:
Percent ceded	25.00%

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- References

No definition available.

+ Details

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Namespace Prefix:	kins_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration