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Reinsurance (Tables)
 12 Months Ended
Dec. 31, 2021
Reinsurance Disclosures [Abstract]  
Reinsurance Recoverable, Credit Quality Indicator
December 31, 2021
($ in thousands)CurrentPast DueTotal Reinsurance Recoverables
Financial strength rating of rated reinsurers
A++$38,601 $9 $38,610 
A+339,857 1,520 341,377 
A95,675 1,227 96,902 
A-3,209 145 3,354 
B++— — — 
B+— — — 
Total rated reinsurers$477,342 $2,901 $480,243 
Non-rated reinsurers
Federal and state pools$116,378 $— $116,378 
Other than federal and state pools4,597 450 5,047 
Total non-rated reinsurers$120,975 $450 $121,425 
Total reinsurance recoverable, gross$598,317 $3,351 $601,668 
Less: ACL(1,600)
Total reinsurance recoverable, net$600,068 

December 31, 2020
($ in thousands)CurrentPast DueTotal Reinsurance Recoverables
Financial strength rating of rated reinsurers
A++$37,464 $102 $37,566 
A+354,846 2,452 357,298 
A105,652 415 106,067 
A-2,139 — 2,139 
B++56 324 380 
B+— — — 
Total rated reinsurers$500,157 $3,293 $503,450 
Non-rated reinsurers
Federal and state pools$82,575 $— $82,575 
Other than federal and state pools2,676 568 3,244 
Total non-rated reinsurers$85,251 $568 $85,819 
Total reinsurance recoverable, gross$585,408 $3,861 $589,269 
Less: ACL(1,777)
Total reinsurance recoverable, net$587,492 
Reinsurance Recoverable, Allowance for Credit Loss
($ in thousands)December 31, 2021December 31, 2020
Balance at beginning of year$1,777 $4,400 
Cumulative effect adjustment— (2,903)
Balance at beginning of year, as adjusted$1,777 $1,497 
Current period change for expected credit losses(177)280 
Write-offs charged against the allowance for credit losses— — 
Recoveries— — 
ACL, end of year$1,600 $1,777 
Schedule of Total Reinsurance Balances Segregated By Reinsurer
 As of December 31, 2021As of December 31, 2020
($ in thousands)Reinsurance Balances% of Reinsurance BalanceReinsurance Balances% of Reinsurance Balance
Total reinsurance recoverables, net of allowance for credit losses$600,068  $587,492  
Total prepaid reinsurance premiums183,007  170,531  
Total reinsurance balance783,075  758,023  
Federal and state pools1:
    
NFIP223,845 29 %178,532 25 %
New Jersey Unsatisfied Claim Judgment Fund49,738 6 52,053 6 
Other2,385 — 1,625 — 
Total federal and state pools275,968 35 232,210 31 
Remaining reinsurance balance$507,107 65 $525,813 69 
Munich Re Group (AM Best rated "A+")$108,381 14 $117,028 15 
Hannover Ruckversicherungs AG (AM Best rated "A+")107,110 14 115,251 15 
AXIS Reinsurance Company (AM Best rated "A")70,814 9 78,617 10 
Swiss Re Group (AM Best rated "A+")29,186 4 33,249 4 
Transatlantic Reinsurance Company (AM Best rated “A+”)26,490 3 24,374 3 
All other reinsurers166,726 21 159,071 21 
   Total reinsurers508,707 65 %527,590 69 %
Less: ACL(1,600)(1,777)
Reinsurers, net of ACL507,107 525,813 
Less: collateral2
(128,699)(130,169)
   Reinsurers, net of collateral$378,408 $395,644 
 1Considered to have minimal risk of default.
2Includes letters of credit, trust funds, and funds held against reinsurance recoverables.
Schedule of List Of Direct, Assumed, And Ceded Reinsurance Amounts
($ in thousands)202120202019
Premiums written:   
Direct$3,656,537 3,204,512 3,084,451 
Assumed22,664 24,288 24,339 
Ceded(489,488)(455,708)(429,366)
Net$3,189,713 2,773,092 2,679,424 
Premiums earned:   
Direct$3,472,715 3,108,687 2,993,157 
Assumed21,550 25,010 24,399 
Ceded(477,012)(451,883)(420,385)
Net$3,017,253 2,681,814 2,597,171 
Loss and loss expense incurred:   
Direct$2,096,512 1,822,034 1,714,880 
Assumed13,813 17,201 22,879 
Ceded(296,341)(203,412)(186,268)
Net$1,813,984 1,635,823 1,551,491 
Schedule of Ceded Premiums and Losses Related to Flood Operations
Ceded to NFIP ($ in thousands)202120202019
Ceded premiums written$(284,311)(274,042)(266,925)
Ceded premiums earned(274,384)(271,598)(259,119)
Ceded loss and loss expense incurred(215,224)(78,993)(71,676)