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Liability for Unpaid Losses and Loss Adjustment Expense - Claims Development (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Claims Development
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	$ 323,340,000	$ 398,409,000
Property and Casualty, Commercial Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	434,445,000
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	72,390,000
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	362,056,000
Property and Casualty, Personal Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	2,544,021,000
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	250,950,000	322,605,000
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	2,293,396,000
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	1,000
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	325,000
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	12,584,000	12,584,000	$ 12,580,000	$ 12,641,000	$ 12,615,000	$ 8,671,000	$ 9,771,000	$ 9,690,000	$ 9,540,000	$ 11,404,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 0
Short-duration Insurance Contract, Cumulative Number of Reported Claims	802
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 12,584,000	12,584,000	12,580,000	12,576,000	12,575,000	8,552,000	7,543,000	6,893,000	6,942,000	4,583,000
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	78,528,000	78,306,000	78,299,000	78,454,000	78,202,000	78,147,000	77,800,000	78,273,000	79,089,000	75,872,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 79,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	12,057
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 78,420,000	77,979,000	77,867,000	78,004,000	77,781,000	77,461,000	75,365,000	72,917,000	68,271,000	$ 47,811,000
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	7,328,000	7,262,000	7,263,000	7,426,000	7,573,000	8,382,000	11,826,000	6,420,000	8,359,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 0
Short-duration Insurance Contract, Cumulative Number of Reported Claims	741
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 7,327,000	7,261,000	7,262,000	7,256,000	7,254,000	7,248,000	5,317,000	5,127,000	2,958,000
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	99,464,000	99,338,000	99,187,000	98,706,000	98,649,000	98,438,000	98,442,000	100,572,000	105,118,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 44,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	8,900
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 99,021,000	98,666,000	98,424,000	97,945,000	97,415,000	96,193,000	93,879,000	89,842,000	$ 66,657,000
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	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	$ 11,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	680
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 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 2016 | Property and Casualty, Personal Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	140,507,000	140,695,000	140,354,000	139,967,000	140,052,000	139,418,000	138,415,000	139,163,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 90,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	13,462
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 140,346,000	139,812,000	139,137,000	138,257,000	137,534,000	133,819,000	125,849,000	$ 92,383,000
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	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	$ 145,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	821
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 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 2017 | Property and Casualty, Personal Insurance Product Line
Claims Development
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	217,223,000	217,198,000	216,278,000	215,894,000	215,221,000	215,680,000	201,328,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 253,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	20,350
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 216,011,000	214,817,000	213,968,000	211,040,000	207,021,000	193,127,000	$ 134,992,000
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	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	$ 316,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	1,140
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 23,506,000	22,266,000	21,410,000	19,114,000	16,217,000	10,638,000
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	275,142,000	273,797,000	271,795,000	271,207,000	269,228,000	267,124,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 644,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	31,115
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 271,536,000	268,953,000	267,015,000	261,089,000	248,852,000	$ 183,238,000
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	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	$ 2,173,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	4,239
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 80,460,000	73,683,000	64,329,000	62,353,000	40,467,000
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	295,511,000	288,161,000	280,048,000	273,512,000	261,689,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 4,166,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	85,881
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 286,362,000	275,698,000	263,657,000	251,530,000	$ 177,516,000
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	68,384,000	69,203,000	64,964,000	61,778,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ (530,000)
Short-duration Insurance Contract, Cumulative Number of Reported Claims	3,666
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 66,848,000	61,885,000	54,551,000	27,852,000
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	339,347,000	333,763,000	324,877,000	299,141,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 502,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	48,081
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 331,438,000	318,619,000	297,871,000	$ 219,513,000
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	68,900,000	70,515,000	76,515,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 1,729,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	4,982
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 62,133,000	57,041,000	38,428,000
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	332,682,000	316,649,000	344,912,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 6,540,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	40,369
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 309,014,000	270,923,000	$ 202,105,000
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	68,165,000	67,573,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ (8,785,000)
Short-duration Insurance Contract, Cumulative Number of Reported Claims	4,581
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 46,535,000	25,068,000
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	452,090,000	484,372,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 9,570,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	58,299
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 414,666,000	$ 244,512,000
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	53,338,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 21,844,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	1,600
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 19,754,000
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	313,527,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 132,514,000
Short-duration Insurance Contract, Cumulative Number of Reported Claims	48,823
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	$ 146,582,000

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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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