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Deposits (Escrow, Mortgage Subserving, and Other Deposits) (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Banking And Thrifts [Abstract]
Interest bearing	$ 1,999.9	$ 2,063.0
Non-interest bearing	2,247.8	4,531.3
Escrow accounts	4,247.7	6,594.3
Interest bearing	606.5	485.7
Other Deposits	193.9	228.0
Deposits, Total	$ 5,048.1	$ 7,308.0
Weighted average interest rate, Interest bearing deposit accounts	1.89%	1.52%

X

- Definition

Banking and thrifts.

+ References

No definition available.

+ Details

Name:	faf_BankingAndThriftsAbstract
Namespace Prefix:	faf_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

+ References

No definition available.

+ Details

Name:	faf_EscrowDepositLiability
Namespace Prefix:	faf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Mortgage subservicing deposits interest bearing.

+ References

No definition available.

+ Details

Name:	faf_MortgageSubservicingDepositsInterestBearing
Namespace Prefix:	faf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Other deposits.

+ References

No definition available.

+ Details

Name:	faf_OtherDeposits
Namespace Prefix:	faf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Weighted average interest rates on interest bearing deposit accounts.

+ References

No definition available.

+ Details

Name:	faf_WeightedAverageInterestRatesOnInterestBearingDepositAccounts
Namespace Prefix:	faf_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(12))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

+ Details

Name:	us-gaap_Deposits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The aggregate of all domestic and foreign interest-bearing deposit liabilities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(12))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

+ Details

Name:	us-gaap_InterestBearingDepositLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The aggregate amount of all domestic and foreign noninterest-bearing deposits liabilities held by the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(12))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

+ Details

Name:	us-gaap_NoninterestBearingDepositLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant