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Summary Of Investments Other Than Investments In Related Parties (Detail)
$ in Thousands
Dec. 31, 2022
USD ($)
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost $ 1,357,419 [1]
Value 1,303,894
Amount Included in the Balance Sheet 1,303,894
Fixed Maturities  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 1,301,723 [1]
Value 1,248,198
Amount Included in the Balance Sheet 1,248,198
Fixed Maturities | United States Government and Government Agencies and Authorities  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 352,533 [1]
Value 344,103
Amount Included in the Balance Sheet 344,103
Fixed Maturities | States, Municipalities, and Political Subdivisions  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 33,471 [1]
Value 31,595
Amount Included in the Balance Sheet 31,595
Fixed Maturities | Mortgage Backed And Asset Backed Securities  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 370,498 [1]
Value 350,180
Amount Included in the Balance Sheet 350,180
Fixed Maturities | Public Utilities  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 39,796 [1]
Value 38,261
Amount Included in the Balance Sheet 38,261
Fixed Maturities | All Other Corporate Bonds  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 505,425 [1]
Value 484,059
Amount Included in the Balance Sheet 484,059
Equity securities  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 17,520 [1]
Value 17,520
Amount Included in the Balance Sheet 17,520
Equity securities | Public Utilities  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 0 [1]
Value 0
Amount Included in the Balance Sheet 0
Equity securities | Industrial and Miscellaneous  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 17,520 [1]
Value 17,520
Amount Included in the Balance Sheet 17,520
Other long-term investments | Other Invested Assets  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 38,176 [1]
Value 38,176
Amount Included in the Balance Sheet $ 38,176
[1] Original cost of fixed maturities adjusted for amortization of premiums and accretion of discounts; original cost of equity securities and other long-term investments adjusted for income or loss earned on investments in accordance with equity method of accounting. All amounts are shown net of impairment losses.