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Summary of Business Segment Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Revenues:          
Gross written premiums $ 108,369,000 $ 99,767,000 $ 313,845,000 $ 293,961,000  
Net written premiums 105,543,000 97,177,000 305,321,000 287,013,000  
Net earned premiums 99,670,000 95,413,000 288,132,000 284,806,000  
Net losses and loss adjustment expenses 49,875,000 52,400,000 169,561,000 159,446,000  
Net investment income 17,911,000 16,488,000 47,400,000 46,319,000  
Net realized investment gains (losses) (3,994,000) (512,000) (3,731,000) 540,000  
Total revenues 114,198,000 111,761,000 333,369,000 332,739,000  
Corporate expenses (7,844,000) (5,923,000) (24,872,000) (18,679,000)  
Income before income taxes 16,064,000 15,885,000 24,099,000 42,824,000  
Income tax expense 3,541,000 3,125,000 5,221,000 8,605,000  
Net income 12,523,000 12,760,000 18,878,000 34,219,000  
Total assets 1,734,088,000 1,761,117,000 1,734,088,000 1,761,117,000 $ 1,731,253,000
Segment assets          
Revenues:          
Gross written premiums 108,369,000 99,767,000 313,845,000 293,961,000  
Net written premiums 105,543,000 97,177,000 305,321,000 287,013,000  
Net earned premiums 99,670,000 95,413,000 288,132,000 284,806,000  
Commission and service fee income 0 [1] 0 0 [2] 0  
Policy and installment fee income 611,000 372,000 1,568,000 1,074,000  
Total segment revenues 100,281,000 95,785,000 289,700,000 285,880,000  
Net losses and loss adjustment expenses 49,875,000 [3] 52,400,000 [4] 169,561,000 [5] 159,446,000 [6]  
Net commission expenses 24,087,000 [3] 22,899,000 [4] 68,264,000 [5] 68,005,000 [6]  
Other underwriting expenses 16,328,000 [3],[7] 14,654,000 [4],[8] 46,573,000 [5],[9] 43,785,000 [6],[10]  
Income (loss) from segments 9,991,000 [3] 5,832,000 [4] 5,302,000 [5] 14,644,000 [6]  
Total assets 267,418,000 262,878,000 267,418,000 262,878,000  
Corporate assets          
Revenues:          
Net investment income 17,911,000 16,488,000 47,400,000 46,319,000  
Net realized investment gains (losses) (3,994,000) (512,000) (3,731,000) 540,000  
Total assets 1,466,670,000 1,498,239,000 1,466,670,000 1,498,239,000  
Elimination          
Revenues:          
Gross written premiums 0 0 0 0  
Net written premiums 0 0 0 0  
Net earned premiums 0   0 0  
Commission and service fee income (14,408,000) [1] 0 (43,308,000) [2] 0  
Policy and installment fee income (0) 0 (0) 0  
Total segment revenues (14,408,000) 0 (43,308,000) 0  
Net losses and loss adjustment expenses (344,000) [3] 0 [4] (1,009,000) [5] 0 [6]  
Net commission expenses (11,031,000) [3] 0 [4] (33,058,000) [5] 0 [6]  
Other underwriting expenses (3,033,000) [3],[7] 0 [4],[8] (9,241,000) [5],[9] 0 [6],[10]  
Income (loss) from segments 0 [3] 0 [4] 0 [5] 0 [6]  
Total assets (16,911,000) 0 (16,911,000) 0  
Agency and Insurance Services          
Revenues:          
Total revenues       0  
Agency and Insurance Services | Segment assets          
Revenues:          
Gross written premiums 0 0 0 0  
Net written premiums 0 0 0 0  
Net earned premiums 0 0 0 0  
Commission and service fee income 14,408,000 [1] 0 43,308,000 [2] 0  
Policy and installment fee income 570,000 0 1,456,000 0  
Total segment revenues 14,978,000 0 44,764,000 0  
Net losses and loss adjustment expenses 0 [3] 0 [4] 0 [5] 0 [6]  
Net commission expenses 0 [3] 0 [4] 0 [5] 0 [6]  
Other underwriting expenses 13,800,000 [3],[7] 0 [4],[8] 39,474,000 [5],[9] 0 [6],[10]  
Income (loss) from segments 1,178,000 [3] 0 [4] 5,290,000 [5] 0 [6]  
Total assets 43,083,000 0 43,083,000 0  
Belmont Core | Segment assets          
Revenues:          
Gross written premiums 108,541,000 103,244,000 316,749,000 297,844,000  
Net written premiums 105,708,000 100,712,000 308,215,000 290,910,000  
Net earned premiums 99,388,000 93,982,000 289,161,000 272,467,000  
Commission and service fee income 0 [1] 0 0 [2] 0  
Policy and installment fee income 0 337,000 0 1,020,000  
Total segment revenues 99,388,000 94,319,000 289,161,000 273,487,000  
Net losses and loss adjustment expenses 52,665,000 [3] 51,382,000 [4] 175,226,000 [5] 151,417,000 [6]  
Net commission expenses 34,859,000 [3] 21,926,000 [4] 101,342,000 [5] 63,406,000 [6]  
Other underwriting expenses 5,361,000 [3],[7] 13,703,000 [4],[8] 14,938,000 [5],[9] 41,048,000 [6],[10]  
Income (loss) from segments 6,503,000 [3] 7,308,000 [4] (2,345,000) [5] 17,616,000 [6]  
Total assets 162,084,000 165,820,000 162,084,000 165,820,000  
Belmont Non-Core | Segment assets          
Revenues:          
Gross written premiums (172,000) (3,477,000) (2,904,000) (3,883,000)  
Net written premiums (165,000) (3,535,000) (2,894,000) (3,897,000)  
Net earned premiums 282,000 1,431,000 (1,029,000) 12,339,000  
Commission and service fee income 0 [1] 0 0 [2] 0  
Policy and installment fee income 41,000 35,000 112,000 54,000  
Total segment revenues 323,000 1,466,000 (917,000) 12,393,000  
Net losses and loss adjustment expenses (2,446,000) [3] 1,018,000 [4] (4,656,000) [5] 8,029,000 [6]  
Net commission expenses 259,000 [3] 973,000 [4] (20,000) [5] 4,599,000 [6]  
Other underwriting expenses 200,000 [3],[7] 951,000 [4],[8] 1,402,000 [5],[9] 2,737,000 [6],[10]  
Income (loss) from segments 2,310,000 [3] (1,476,000) [4] 2,357,000 [5] (2,972,000) [6]  
Total assets $ 79,162,000 $ 97,058,000 $ 79,162,000 $ 97,058,000  
[1] Consists of intersegment revenues, which are eliminated in consolidation.
[2] Consists of intersegment revenues, which are eliminated in consolidation.
[3] The significant expense categories and amounts align with the segment-level information that is regularly provided to the CODM.
[4] The significant expense categories and amounts align with the segment-level information that is regularly provided to the CODM.
[5] The significant expense categories and amounts align with the segment-level information that is regularly provided to the CODM.
[6] The significant expense categories and amounts align with the segment-level information that is regularly provided to the CODM.
[7] Other underwriting expenses consist primarily of personnel expenses and general operating expenses related to underwriting activities.
[8] Other underwriting expenses consist primarily of personnel expenses and general operating expenses related to underwriting activities.
[9] Other underwriting expenses consist primarily of personnel expenses and general operating expenses related to underwriting activities
[10] Other underwriting expenses consist primarily of personnel expenses and general operating expenses related to underwriting activities.