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Liability for Unpaid Losses and Loss Adjustment Expense - Claims Development (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Claims Development
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	$ 95,625,000	$ 105,196,000
Property and Casualty, Commercial Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	485,593,000
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	74,003,000	80,256,000
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	411,590,000
Property and Casualty, Personal Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	270,002,000
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	21,622,000	24,940,000
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	248,789,000
Short-duration Insurance Contracts, Accident Year 2013 | Property and Casualty, Commercial Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	0
Short-duration Insurance Contracts, Accident Year 2013 | Property and Casualty, Personal Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	409,000
Short-duration Insurance Contracts, Accident Year 2014 | Property and Casualty, Commercial Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	15,611,000	15,611,000	$ 15,618,000	$ 15,604,000	$ 15,602,000	$ 16,070,000	$ 16,816,000	$ 16,311,000	$ 15,752,000	$ 15,845,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 0
Short-duration Insurance Contract, Cumulative Number of Reported Claims	680
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 15,611,000	15,611,000	15,606,000	15,475,000	15,460,000	15,336,000	14,420,000	13,212,000	9,452,000	6,379,000
Short-duration Insurance Contracts, Accident Year 2014 | Property and Casualty, Personal Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	48,329,000	48,389,000	48,141,000	48,249,000	47,905,000	47,797,000	47,661,000	47,721,000	47,315,000	48,290,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 0
Short-duration Insurance Contract, Cumulative Number of Reported Claims	1,881
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 48,329,000	48,320,000	48,089,000	47,776,000	47,703,000	47,482,000	47,296,000	46,573,000	44,482,000	$ 39,871,000
Short-duration Insurance Contracts, Accident Year 2015 | Property and Casualty, Commercial Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	28,678,000	28,680,000	28,350,000	26,910,000	26,332,000	26,614,000	24,563,000	20,379,000	16,504,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 279,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	821
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 28,057,000	28,024,000	27,303,000	25,269,000	23,605,000	22,978,000	20,640,000	17,134,000	10,188,000
Short-duration Insurance Contracts, Accident Year 2015 | Property and Casualty, Personal Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	26,920,000	26,714,000	26,693,000	26,428,000	26,325,000	26,272,000	25,772,000	26,948,000	27,812,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 0
Short-duration Insurance Contract, Cumulative Number of Reported Claims	2,316
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 26,920,000	26,600,000	26,137,000	26,125,000	26,019,000	25,374,000	24,863,000	24,964,000	$ 17,151,000
Short-duration Insurance Contracts, Accident Year 2016 | Property and Casualty, Commercial Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	23,935,000	38,526,000	23,945,000	23,397,000	23,816,000	22,578,000	25,043,000	37,837,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 351,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	1,143
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 23,583,000	38,063,000	23,506,000	22,266,000	21,410,000	19,114,000	16,217,000	10,638,000
Short-duration Insurance Contracts, Accident Year 2016 | Property and Casualty, Personal Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	33,302,000	33,302,000	33,320,000	33,337,000	33,412,000	33,471,000	33,987,000	33,863,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 29,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	785
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 33,273,000	33,251,000	33,246,000	33,252,000	33,119,000	32,961,000	32,715,000	$ 26,529,000
Short-duration Insurance Contracts, Accident Year 2017 | Property and Casualty, Commercial Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	80,536,000	91,545,000	87,833,000	83,286,000	78,970,000	72,135,000	70,650,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 16,647,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	4,242
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 54,143,000	84,933,000	80,460,000	73,683,000	64,329,000	62,353,000	40,467,000
Short-duration Insurance Contracts, Accident Year 2017 | Property and Casualty, Personal Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	14,063,000	14,183,000	14,203,000	14,398,000	13,864,000	21,325,000	20,741,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 28,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	1,104
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 14,028,000	13,835,000	13,970,000	13,758,000	13,374,000	19,445,000	$ 13,359,000
Short-duration Insurance Contracts, Accident Year 2018 | Property and Casualty, Commercial Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	67,238,000	84,727,000	68,384,000	69,203,000	64,964,000	61,778,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ (429,000)
Short-duration Insurance Contract, Cumulative Number of Reported Claims	3,674
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 67,193,000	82,443,000	66,848,000	61,885,000	54,551,000	27,852,000
Short-duration Insurance Contracts, Accident Year 2018 | Property and Casualty, Personal Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	20,307,000	20,056,000	19,669,000	19,138,000	18,838,000	20,421,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 279,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	1,373
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 19,325,000	19,262,000	18,563,000	17,780,000	17,305,000	$ 15,758,000
Short-duration Insurance Contracts, Accident Year 2019 | Property and Casualty, Commercial Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	70,611,000	41,424,000	68,900,000	70,515,000	76,515,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 1,899,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	5,006
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 64,274,000	34,768,000	62,133,000	57,041,000	38,428,000
Short-duration Insurance Contracts, Accident Year 2019 | Property and Casualty, Personal Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	9,562,000	9,812,000	9,704,000	10,084,000	14,511,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 218,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	721
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 9,195,000	9,057,000	8,894,000	8,481,000	$ 6,459,000
Short-duration Insurance Contracts, Accident Year 2020 | Property and Casualty, Commercial Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	75,369,000	66,177,000	68,165,000	67,573,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 3,408,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	4,664
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 74,858,000	69,903,000	46,535,000	25,068,000
Short-duration Insurance Contracts, Accident Year 2020 | Property and Casualty, Personal Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	22,163,000	22,080,000	22,184,000	24,796,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 523,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	791
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 21,037,000	20,592,000	19,976,000	$ 15,909,000
Short-Duration Insurance Contract, Accident Year 2019 | Property and Casualty, Commercial Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	29,991,000	38,304,000	53,338,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ (4,413,000)
Short-duration Insurance Contract, Cumulative Number of Reported Claims	1,802
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 32,033,000	28,506,000	19,754,000
Short-Duration Insurance Contract, Accident Year 2019 | Property and Casualty, Personal Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	30,438,000	30,946,000	34,129,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 1,757,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	613
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 27,207,000	26,795,000	$ 22,143,000
Short-Duration Insurance Contract, Accident Year 2020 | Property and Casualty, Commercial Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	68,194,000	65,255,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 18,688,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	1,515
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 42,845,000	7,742,000
Short-Duration Insurance Contract, Accident Year 2020 | Property and Casualty, Personal Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	49,444,000	48,641,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 4,653,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	614
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 39,759,000	$ 32,008,000
Short-Duration Insurance Contract, Accident Year 2021 | Property and Casualty, Commercial Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	25,430,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 15,144,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	314
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 8,993,000
Short-Duration Insurance Contract, Accident Year 2021 | Property and Casualty, Personal Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	15,474,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 3,332,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	639
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 9,716,000

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Amount, after reinsurance, of paid claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of incurred-but-not-reported (IBNR) liabilities plus expected development on reported claims, for claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of incurred claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Cumulative number of reported claims for short-duration insurance contracts.

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