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RESERVES FOR LOSSES AND LOSS SETTLEMENT EXPENSES (Tables)
 12 Months Ended
Dec. 31, 2020
Insurance Loss Reserves [Abstract]  
Schedule of Property and Casualty Losses Settlement Expense
The following table provides an analysis of changes in our property and casualty losses and loss settlement expense reserves for 2020, 2019 and 2018 (net of reinsurance amounts):
   
Years Ended December 31,202020192018
Gross liability for losses and loss settlement expenses
at beginning of year		$1,421,754 $1,312,483 $1,224,183 
Ceded losses and loss settlement expenses(68,536)(57,094)(59,871)
Net liability for losses and loss settlement expenses
at beginning of year		$1,353,218 $1,255,389 $1,164,312 
Losses and loss settlement expenses incurred
for claims occurring during
   Current year$887,119 $835,507 $785,778 
   Prior years(17,652)(5,335)(54,167)
Total incurred$869,467 $830,172 $731,611 
Losses and loss settlement expense payments
for claims occurring during
   Current year$354,635 $333,975 $306,032 
   Prior years421,762 398,368 334,502 
Total paid$776,397 $732,343 $640,534 
Net liability for losses and loss settlement expenses
at end of year		$1,446,288 $1,353,218 $1,255,389 
Ceded loss and loss settlement expenses131,843 68,536 57,094 
Gross liability for losses and loss settlement expenses
at end of year		$1,578,131 $1,421,754 $1,312,483 
Incurred and Paid Losses and Loss Settlement Expense Development
The following tables provide information about incurred and paid losses and loss settlement expense development as of December 31, 2020, net of reinsurance, as well as cumulative development, cumulative claim frequency and IBNR liabilities. Claim data for Mercer Insurance Group, Inc., which was acquired on March 28, 2011, is presented retrospectively.
The cumulative number of reported claims, for calendar year 2020, 2019 and 2018, are counted for all lines of business on a per claimant per coverage basis and a single event may result in multiple claims due to the involvement of multiple individual claimants and / or multiple independent coverages. Claim counts for calendar years 2016 and prior are counted on a per claim and per coverage basis. Claim counts include open claims, claims that have been paid and closed, and reported claims that have been closed without the need for any payment.

Line of business: Commercial other liability
Incurred losses and allocated loss settlement expenses, net of reinsuranceAs of December 31, 2020
For the years ended December 31,Total of incurred but not reported liabilities plus expected development on reported claimsCumulative developmentCumulative number of reported claims
Accident Year2011201220132014201520162017201820192020
(Unaudited)
2011$81,522 $64,738 $88,371 $88,200 $79,591 $80,801 $81,463 $80,338 $81,694 $81,394 $11,202 (128)5,634 
2012100,389 96,158 94,195 91,980 92,537 91,346 89,731 91,571 89,900 12,862 (10,489)5,841 
2013104,982 91,460 90,502 86,119 85,399 88,816 86,082 85,999 3,498 (18,983)6,406 
2014118,928 117,958 106,486 97,809 102,487 105,507 107,417 4,907 (11,511)6,570 
2015137,386 125,307 120,005 127,091 129,945 131,325 10,405 (6,061)7,732 
2016139,144 130,041 136,275 142,397 140,784 15,698 1,640 8,882 
2017139,602 139,032 152,547 156,369 24,426 16,767 8,883 
2018163,059 172,894 176,496 34,486 13,437 8,590 
2019149,173 169,344 46,518 20,171 7,537 
2020171,013 83,792 4,478 
Total$1,310,041 
Line of business: Commercial other liability
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance
For the years ended December 31,
Accident Year2011201220132014201520162017201820192020
(Unaudited)
2011$6,236 $13,670 $26,260 $40,595 $50,146 $56,150 $62,165 $64,541 $66,500 $68,052 
20126,875 24,620 39,948 55,316 64,574 69,800 71,773 73,819 74,644 
20139,835 25,228 39,953 54,559 65,773 72,115 75,961 78,448 
201410,207 29,679 50,211 70,363 83,109 93,060 96,509 
201511,185 27,182 53,901 74,292 96,339 104,472 
201613,782 38,184 63,526 88,885 102,757 
201717,716 43,172 70,500 91,984 
201816,200 44,772 79,168 
201918,221 46,986 
202017,011 
Total$760,031 
All outstanding liabilities for unpaid losses and loss settlement expenses before 2011, net of reinsurance35,801 
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance$585,811 
Line of business: Commercial fire and allied
Incurred losses and allocated loss settlement expenses, net of reinsuranceAs of December 31, 2020
For the years ended December 31,Total of incurred but not reported liabilities plus expected development on reported claimsCumulative developmentCumulative number of reported claims
Accident Year2011201220132014201520162017201820192020
(Unaudited)
2011$148,220 $142,330 $117,082 $120,492 $119,820 $120,219 $121,434 $121,319 $121,749 $121,982 $285 (26,238)16,079 
2012138,602 110,448 108,774 108,047 107,958 108,623 109,687 109,480 110,245 634 (28,357)6,466 
201391,521 88,550 91,498 92,212 93,826 93,858 92,988 92,855 61 1,334 6,662 
2014126,216 131,198 128,762 128,185 128,503 126,811 127,068 108 852 7,935 
2015103,177 108,293 110,633 108,235 105,218 104,646 144 1,469 7,579 
2016147,473 144,208 143,721 143,724 143,108 667 (4,365)9,849 
2017155,139 160,240 160,946 161,693 1,536 6,554 13,445 
2018143,280 146,951 146,378 2,610 3,098 10,683 
2019164,030 155,482 4,271 (8,548)10,992 
2020207,207 29,773 13,368 
Total$1,370,664 
Line of business: Commercial fire and allied
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance
For the years ended December 31,
Accident Year2011201220132014201520162017201820192020
(Unaudited)
2011$85,585 $104,800 $109,429 $112,497 $116,614 $118,183 $120,178 $120,731 $121,063 $121,157 
201271,008 94,380 100,078 103,197 105,250 106,521 106,740 107,992 108,123 
201359,331 78,226 82,853 86,115 89,200 91,493 92,012 92,472 
201484,456 113,663 116,750 122,370 123,697 125,745 126,307 
201567,217 90,454 95,515 101,367 104,115 103,975 
201692,895 125,962 132,429 137,909 139,353 
201799,484 137,058 145,900 152,219 
201892,770 123,559 133,703 
2019100,980 136,084 
2020128,704 
Total$1,242,097 
All outstanding liabilities for unpaid losses and loss settlement expenses before 2011, net of reinsurance723 
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance$129,290 
Line of business: Commercial automobile
Incurred losses and allocated loss settlement expenses, net of reinsuranceAs of December 31, 2020
For the years ended December 31,Total of incurred but not reported liabilities plus expected development on reported claimsCumulative developmentCumulative number of reported claims
Accident Year2011201220132014201520162017201820192020
(Unaudited)
2011$84,887 $87,299 $90,750 $92,519 $92,379 $91,336 $90,766 $90,838 $90,643 $90,972 $32 6,085 15,262 
2012100,039 90,848 94,755 95,321 96,594 96,389 96,305 96,059 96,176 — (3,863)14,365 
2013104,356 98,037 102,943 103,726 104,980 105,248 104,886 106,140 356 1,784 15,528 
2014107,723 106,076 113,720 118,869 120,385 121,077 120,599 457 12,876 17,320 
2015125,506 129,816 132,206 138,987 137,395 137,335 500 11,829 20,079 
2016174,018 175,357 174,337 175,657 173,823 1,449 (195)27,288 
2017227,919 224,553 235,110 233,159 5,553 5,240 32,838 
2018236,629 245,173 253,045 14,134 16,416 34,380 
2019279,229 291,139 38,451 11,910 34,393 
2020243,360 71,185 22,331 
Total$1,745,748 
Line of business: Commercial automobile
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance
For the years ended December 31,
Accident Year2011201220132014201520162017201820192020
(Unaudited)
2011$34,332 $50,931 $65,021 $79,383 $85,348 $87,475 $88,609 $89,459 $90,515 $90,677 
201239,247 57,201 71,469 82,944 90,292 93,179 94,747 94,983 96,176 
201343,592 67,630 79,663 90,780 96,375 100,058 101,580 103,037 
201445,704 68,033 87,590 99,922 109,682 113,751 116,843 
201550,782 78,225 99,201 118,395 129,317 134,100 
201666,013 103,528 128,157 148,224 164,341 
201781,311 126,644 166,170 197,893 
201881,572 138,092 187,405 
201991,919 153,244 
202067,660 
Total$1,311,376 
All outstanding liabilities for unpaid losses and loss settlement expenses before 2011, net of reinsurance(80)
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance$434,293 
Line of business: Workers' compensation
Incurred losses and allocated loss settlement expenses, net of reinsuranceAs of December 31, 2020
For the years ended December 31,Total of incurred but not reported liabilities plus expected development on reported claimsCumulative developmentCumulative number of reported claims
Accident Year2011201220132014201520162017201820192020
(Unaudited)
2011$39,967 $38,481 $35,352 $34,309 $33,585 $33,314 $33,352 $32,707 $32,384 $31,621 $159 (8,346)3,965 
201248,848 46,279 42,158 38,423 38,553 39,015 39,182 39,063 38,290 229 (10,558)3,992 
201364,048 62,579 56,369 54,584 52,761 51,753 50,984 50,349 307 (13,699)4,255 
201464,051 60,729 58,284 56,630 54,636 53,023 52,889 699 (11,162)4,801 
201553,788 55,578 51,003 46,682 46,019 44,706 578 (9,082)5,666 
201670,419 66,575 61,648 55,168 53,964 815 (16,455)7,927 
201776,184 69,528 55,982 51,874 1,182 (24,310)8,173 
201871,972 67,883 59,192 1,802 (12,780)7,947 
201952,136 49,189 2,335 (2,947)7,113 
202045,365 4,289 3,909 
Total$477,439 
Line of business: Workers' compensation
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance
For the years ended December 31,
Accident Year2011201220132014201520162017201820192020
(Unaudited)
2011$10,322 $21,678 $26,033 $27,497 $28,247 $29,022 $29,453 $29,700 $29,890 $30,573 
201211,802 23,023 28,397 30,933 33,063 34,330 35,388 36,060 36,520 
201314,136 30,209 38,023 42,941 45,078 47,071 47,572 48,093 
201413,965 30,289 38,441 42,964 45,193 45,825 46,299 
201512,063 27,304 35,229 38,424 39,305 40,034 
201614,413 32,345 40,680 45,743 47,082 
201714,647 31,309 38,083 41,672 
201816,949 35,369 43,189 
201913,582 29,668 
202017,603 
Total$380,733 
All outstanding liabilities for unpaid losses and loss settlement expenses before 2011, net of reinsurance19,345 
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance$116,050 
Line of business: Personal
Incurred losses and allocated loss settlement expenses, net of reinsuranceAs of December 31, 2020
For the years ended December 31,Total of incurred but not reported liabilities plus expected development on reported claimsCumulative developmentCumulative number of reported claims
Accident Year2011201220132014201520162017201820192020
(Unaudited)
2011$50,014 $48,534 $47,090 $47,035 $46,968 $47,013 $46,733 $46,761 $46,752 $46,751 $— (3,263)14,848 
201247,924 46,199 46,403 46,150 44,715 44,352 44,165 44,158 44,160 1 (3,764)10,790 
201339,232 38,525 37,262 37,086 36,729 36,661 36,486 36,467 1 (2,765)9,250 
201453,910 52,661 52,944 52,782 52,615 52,702 52,810 12 (1,100)10,959 
201542,848 41,088 40,336 40,368 40,220 40,194 22 (2,654)9,548 
201648,072 45,840 45,379 45,961 45,113 58 (2,959)11,896 
201760,330 59,342 58,695 58,544 119 (1,786)14,691 
201851,639 51,721 52,715 365 1,076 13,658 
201959,547 58,378 581 (1,169)13,466 
202081,206 6,588 15,585 
Total$516,338 
Line of business: Personal
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance
For the years ended December 31,
Accident Year2011201220132014201520162017201820192020
(Unaudited)
2011$36,489 $43,801 $45,306 $45,949 $46,487 $46,573 $46,575 $46,650 $46,752 $46,751 
201230,415 41,979 43,375 44,448 43,569 44,139 44,158 44,158 44,159 
201325,505 32,788 34,297 35,306 36,155 36,323 36,397 36,466 
201437,055 47,912 49,710 51,837 52,018 52,543 52,519 
201529,551 37,431 39,027 39,428 39,865 40,029 
201632,999 40,910 42,660 44,046 44,618 
201742,135 53,111 55,982 57,169 
201837,410 47,433 49,464 
201940,544 52,390 
202054,181 
Total$477,746 
All outstanding liabilities for unpaid losses and loss settlement expenses before 2011, net of reinsurance620 
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance$39,210 
Unpaid Losses and Loss Settlement Expenses Liability
The reconciliation of the net incurred and loss development tables to the liability for unpaid losses and loss settlement expenses in the consolidated statement of financial position is as follows.

December 31, 2020
Net outstanding liabilities for unpaid losses and allocated loss settlement expenses:
Commercial other liability$585,811 
Commercial fire and allied129,290 
Commercial automobile434,293 
Commercial workers' compensation116,050 
Personal39,210 
All other lines43,045 
Net outstanding liabilities for unpaid losses and allocated loss settlement expenses1,347,699 
Net outstanding liabilities for unpaid unallocated loss settlement expenses97,379 
Fair value adjustment (purchase accounting adjustment for Mercer acquisition)1,210 
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance1,446,288 
Reinsurance recoverable on unpaid losses and allocated loss settlement expenses:
Commercial other liability29,497 
Commercial fire and allied42,481 
Commercial automobile3,334 
Commercial workers' compensation47,130 
Personal8,867 
All other lines1,692 
Reinsurance recoverable on unpaid losses and allocated loss settlement expenses133,001 
Reinsurance fair value amortization (purchase accounting adjustment for Mercer acquisition)(1,158)
Total reinsurance recoverable on unpaid losses and loss settlement expenses131,843 
Total gross liability for unpaid losses and loss settlement expenses$1,578,131 
Average Historical Claims Duration
The following is supplementary information about average historical claims duration as of December 31, 2020.
Average annual percentage payout of incurred claims by age, net of reinsurance
Year 1Year 2Year 3Year 4Year 5Year 6Year 7Year 8Year 9Year 10
(Unaudited)
Commercial other liability9.6 %16.0 %18.0 %16.8 %12.3 %7.2 %4.3 %2.7 %1.7 %1.9 %
Commercial fire and allied64.6 %21.4 %4.8 %3.8 %2.2 %1.3 %0.7 %0.7 %0.2 %0.1 %
Commercial automobile35.9 %20.3 %15.5 %12.5 %7.5 %3.1 %1.7 %0.9 %1.2 %0.2 %
Commercial workers' compensation29.5 %32.4 %14.8 %7.6 %3.5 %2.5 %1.5 %1.2 %0.9 %2.2 %
Personal71.3 %19.7 %3.8 %2.4 %0.7 %0.7 %0.1 %0.1 %0.1 %— %