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Reinsurance (Tables)
 12 Months Ended
Dec. 31, 2022
Reinsurance Disclosures [Abstract]  
Reinsurance Recoverable, Credit Quality Indicator
December 31, 2022
($ in thousands)CurrentPast DueTotal Reinsurance Recoverables
Financial strength rating of rated reinsurers
A++$46,282 $1 $46,283 
A+425,395 3,191 428,586 
A106,102 1,315 107,417 
A-7,148 89 7,237 
Total rated reinsurers$584,927 $4,596 $589,523 
Non-rated reinsurers
Federal and state pools$180,794 $— $180,794 
Other than federal and state pools13,678 415 14,093 
Total non-rated reinsurers$194,472 $415 $194,887 
Total reinsurance recoverable, gross$779,399 $5,011 $784,410 
Less: ACL(1,600)
Total reinsurance recoverable, net$782,810 

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 
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$600,068 
Reinsurance Recoverable, Allowance for Credit Loss
($ in thousands)December 31, 2022December 31, 2021
Balance at beginning of year$1,600 $1,777 
Current period change for expected credit losses— (177)
Write-offs charged against the allowance for credit losses— — 
Recoveries— — 
ACL, end of year$1,600 $1,600 

For a discussion of the methodology used to evaluate our estimate of expected credit losses on our reinsurance recoverable balance, refer to Note 2. "Summary of Significant Accounting Policies."
Schedule of Total Reinsurance Balances Segregated By Reinsurer
 As of December 31, 2022As of December 31, 2021
($ in thousands)Reinsurance Balances% of Reinsurance BalanceReinsurance Balances% of Reinsurance Balance
Total reinsurance recoverables, net of allowance for credit losses$782,810  $600,068  
Total prepaid reinsurance premiums172,371  183,007  
Total reinsurance balance955,181  783,075  
Federal and state pools1:
    
NFIP276,541 29 %223,845 29 %
New Jersey Unsatisfied Claim Judgment Fund45,496 5 49,738 6 
Other3,488 — 2,385 — 
Total federal and state pools325,525 34 275,968 35 
Remaining reinsurance balance$629,656 66 $507,107 65 
Munich Re Group (AM Best rated "A+")$127,106 13 $108,381 14 
Hannover Ruckversicherungs AG (AM Best rated "A+")124,706 13 107,110 14 
AXIS Reinsurance Company (AM Best rated "A")70,957 8 70,814 9 
Swiss Re Group (AM Best rated "A+")36,525 4 29,186 4 
Transatlantic Reinsurance Company (AM Best rated “A+”)32,730 3 26,490 3 
All other reinsurers239,232 25 166,726 21 
   Total reinsurers631,256 66 %508,707 65 %
Less: ACL(1,600)(1,600)
Reinsurers, net of ACL629,656 507,107 
Less: collateral2
(126,167)(128,699)
   Reinsurers, net of collateral$503,489 $378,408 
 1Considered to have minimal risk of default.
2Includes letters of credit, trust funds, and funds held against reinsurance recoverables.
Schedule of List Of Direct, Assumed, And Ceded Reinsurance Amounts
($ in thousands)202220212020
Premiums written:   
Direct$4,068,518 3,656,537 3,204,512 
Assumed32,320 22,664 24,288 
Ceded(527,248)(489,488)(455,708)
Net$3,573,590 3,189,713 2,773,092 
Premiums earned:   
Direct$3,880,522 3,472,715 3,108,687 
Assumed30,742 21,550 25,010 
Ceded(537,884)(477,012)(451,883)
Net$3,373,380 3,017,253 2,681,814 
Loss and loss expense incurred:   
Direct$2,537,638 2,096,512 1,822,034 
Assumed23,160 13,813 17,201 
Ceded(449,020)(296,341)(203,412)
Net$2,111,778 1,813,984 1,635,823 
Schedule of Ceded Premiums and Losses Related to Flood Operations
Ceded to NFIP ($ in thousands)202220212020
Ceded premiums written$(259,246)(284,311)(274,042)
Ceded premiums earned(274,100)(274,384)(271,598)
Ceded loss and loss expense incurred(200,467)(215,224)(78,993)