Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

Name:	us-gaap_AccountsReceivableNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(30)(a)(4))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(a)(3))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (h)(2)
-URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(ii)
-URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e681-108580

Schedule II - Condensed Financial Information of Registrant, Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investments other than subsidiaries [Abstract]
Fixed income securities	$ 919,692	$ 795,538
Limited partnerships	7,214	23,292
Total Investments	996,677	908,424
Cash and cash equivalents	58,301	67,851
OtherAssets	25,805	24,566
Total Assets	1,722,827	1,634,360
Liabilities [Abstract]
Short-term borrowings	20,000	20,000
Total Liabilities	1,359,745	1,270,044
Shareholders' equity [Abstract]
Additional paid-in capital	54,571	53,349
Accumulated other comprehensive income	21,759	9,369
Retained earnings	286,143	300,988
Total Shareholders' Equity	363,082	364,316	$ 356,082	$ 418,811
Total Liabilities and Shareholders' Equity	1,722,827	1,634,360
Class A [Member]
Shareholders' equity [Abstract]
Common stock	111	111
Class B [Member]
Shareholders' equity [Abstract]
Common stock	498	499
Protective Insurance Corporation [Member]
Assets [Abstract]
Investment in subsidiaries	389,757	398,725
Due from affiliates	7,877	1,579
Investments other than subsidiaries [Abstract]
Fixed income securities	23,379	23,979
Limited partnerships	206	206
Total Investments	23,585	24,185
Cash and cash equivalents	12,917	7,059	$ 15,185	$ 26,496
Accounts receivable	7,059	5,606
OtherAssets	14,316	22,153
Total Assets	455,511	459,307
Liabilities [Abstract]
Premiums payable	16,866	20,238
Deposits from insureds	44,268	42,067
Short-term borrowings	20,000	20,000
Other liabilities	11,295	12,686
Total Liabilities	92,429	94,991
Shareholders' equity [Abstract]
Additional paid-in capital	54,571	53,349
Accumulated other comprehensive income	21,759	9,369
Retained earnings	286,143	300,988
Total Shareholders' Equity	363,082	364,316
Total Liabilities and Shareholders' Equity	455,511	459,307
Protective Insurance Corporation [Member] \| Class A [Member]
Shareholders' equity [Abstract]
Common stock	111	111
Protective Insurance Corporation [Member] \| Class B [Member]
Shareholders' equity [Abstract]
Common stock	$ 498	$ 499