XML 38 R25.htm IDEA: XBRL DOCUMENT v3.24.1.u1

Fair Value Option (Tables)

3 Months Ended

Mar. 31, 2024

Fair Value Option [Abstract]

Gains And Losses Due To Changes In Fair Value Of Investments

The following table presents gains (losses) recognized due to changes in fair value of financial instruments pursuant to application of the fair value option:

			Three Months Ended March 31,
			2024						2023
			(Amounts in thousands)
Fixed maturity securities			$	(9,294)					$	39,776
Equity securities			34,498						3,240
Short-term investments			(104)						34
Total investment gains			$	25,100					$	43,050
Note receivable			(156)						—
Total gains			$	24,944					$	43,050

X

- Definition

Fair Value Option [Abstract]

+ References

No definition available.

+ Details

Name:	mcy_FairValueOptionAbstract
Namespace Prefix:	mcy_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of unrealized gains and losses on investments.

+ References

No definition available.

+ Details

Name:	us-gaap_UnrealizedGainLossOnInvestmentsTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration