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Investments (Tables)
 6 Months Ended
Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract]  
Schedule of Cost or Amortized Cost and Fair Value of Securities Available for Sale
The following table provides the amortized cost and fair value of available-for-sale debt securities as of the dates presented (in thousands):
June 30, 2023
Amortized
Cost		Allowance for Expected Credit LossesGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
Debt Securities:
  U.S. government obligations and agencies$26,815 $— $2 $(1,000)$25,817 
  Corporate bonds791,001 (609)121 (84,529)705,984 
  Mortgage-backed and asset-backed securities333,246 — 258 (37,642)295,862 
  Municipal bonds17,137 (5)1 (2,246)14,887 
  Redeemable preferred stock10,860 (144)— (1,758)8,958 
Total$1,179,059 $(758)$382 $(127,175)$1,051,508 

December 31, 2022
Amortized
Cost		Allowance for Expected Credit LossesGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
Debt Securities:
  U.S. government obligations and agencies$12,602 $— $— $(938)$11,664 
  Corporate bonds788,737 (729)130 (93,077)695,061 
  Mortgage-backed and asset-backed securities327,166 — 148 (39,707)287,607 
  Municipal bonds14,924 (2)— (2,551)12,371 
  Redeemable preferred stock9,423 (189)— (1,311)7,923 
Total$1,152,852 $(920)$278 $(137,584)$1,014,626 
Schedule of Credit Quality of Investment Securities
The following table provides the credit quality of available-for-sale debt securities with contractual maturities as of the dates presented (dollars in thousands):
June 30, 2023December 31, 2022
Average Credit RatingsFair Value% of Total
 Fair Value		Fair Value% of Total
 Fair Value
AAA$327,640 31.2 %$297,475 29.3 %
AA159,546 15.2 %154,975 15.3 %
A337,819 32.1 %327,427 32.3 %
BBB225,573 21.4 %232,316 22.9 %
No Rating Available930 0.1 %2,433 0.2 %
   Total$1,051,508 100.0 %$1,014,626 100.0 %
Schedule of Amortized Cost and Fair Value on Mortgage-Backed and Asset-Backed Securities
The following table summarizes the amortized cost and fair value of mortgage-backed and asset-backed securities as of the dates presented (in thousands):
June 30, 2023December 31, 2022
Amortized
Cost		Fair ValueAmortized
Cost		Fair Value
Mortgage-backed securities:
Agency$159,686 $137,590 $157,672 $133,928 
Non-agency63,535 53,284 60,328 50,478 
Asset-backed securities:
Auto loan receivables55,212 53,166 62,128 59,370 
Credit card receivables1,657 1,607 657 612 
Other receivables53,156 50,215 46,381 43,219 
Total$333,246 $295,862 $327,166 $287,607 
Schedule of Fair Value and Gross Unrealized Losses on Securities Available for Sale
The following tables summarize available-for-sale debt securities, aggregated by major security type and length of time that individual securities have been in a continuous unrealized loss position, for which no allowance for expected credit losses has been recorded as of the dates presented (in thousands):
June 30, 2023
Less Than 12 Months12 Months or Longer
Number of
Issues		Fair ValueUnrealized
Losses		Number of
Issues		Fair ValueUnrealized
Losses
Debt Securities:
U.S. government obligations and agencies4 $9,744 $(231)6 $11,831 $(769)
Corporate bonds35 20,399 (457)256 317,257 (41,497)
Mortgage-backed and asset-backed securities38 47,334 (1,211)177 222,783 (36,431)
Municipal bonds2 1,113 (10)3 6,832 (1,247)
Redeemable preferred stock2 765 (93)2 212 (62)
Total81 $79,355 $(2,002)444 $558,915 $(80,006)

December 31, 2022
Less Than 12 Months12 Months or Longer
Number of
Issues		Fair ValueUnrealized
Losses		Number of
Issues		Fair ValueUnrealized
Losses
Debt Securities:
U.S. government obligations and agencies2 $2,721 $(110)5 $8,943 $(828)
Corporate bonds40 26,563 (2,910)247 325,992 (46,451)
Mortgage-backed and asset-backed securities64 52,751 (2,974)146 219,189 (36,733)
Municipal bonds— — — 3 6,621 (1,458)
Redeemable preferred stock1 95 (51)— — — 
Total107 $82,130 $(6,045)401 $560,745 $(85,470)
Schedule of Debt Securities, Available-for-sale, Allowance for Credit Loss
The following table presents a reconciliation of the beginning and ending balances for expected credit losses on available-for-sale debt securities (in thousands):
Corporate BondsMunicipal BondsRedeemable
 Preferred Stock		Total
Balance, December 31, 2021$371 $1 $117 $489 
Provision for (or reversal of) credit loss expense358 1 72 431 
Balance, December 31, 2022729 2 189 920 
Provision for (or reversal of) credit loss expense(120)3 (45)(162)
Balance, June 30, 2023$609 $5 $144 $758 
Schedule of Amortized Cost and Fair Value of Investments With Contractual Maturities
The following table presents the amortized cost and fair value of investments with maturities as of the date presented (in thousands):
June 30, 2023
Amortized CostFair Value
Due in one year or less$101,298 $99,287 
Due after one year through five years599,340 547,492 
Due after five years through ten years296,330 249,578 
Due after ten years178,289 152,021 
Perpetual maturity securities3,802 3,130 
Total$1,179,059 $1,051,508 
Schedule of Securities Available for Sale
The following table provides certain information related to available-for-sale debt securities, equity securities and investment in real estate during the periods presented (in thousands):
Three Months Ended
June 30,		Six Months Ended
June 30,
2023202220232022
Proceeds from sales and maturities (fair value):
  Available-for-sale debt securities $15,872 $27,911 $46,727 $53,217 
  Equity securities$34,444 $2,760 $37,233 $17,692 
Gross realized gains on sale of securities:
  Available-for-sale debt securities $— $236 $5 $242 
  Equity securities$1,498 $224 $1,552 $548 
Gross realized losses on sale of securities:
  Available-for-sale debt securities$(21)$(1,185)$(727)$(1,455)
  Equity securities $(595)$— $(736)$(2)
Schedule of Investment Income (Expense) Comprised Primarily of Interest and Dividends
The following table presents the components of net investment income, comprised primarily of interest and dividends, for the periods presented (in thousands):
Three Months Ended
June 30,		Six Months Ended
June 30,
2023202220232022
Available-for-sale debt securities$5,927 $4,877 $11,797 $8,944 
Equity securities868 690 1,921 1,225 
Cash and cash equivalents (1)4,949 233 9,152 255 
Other (2)127 121 268 249 
  Total investment income11,871 5,921 23,138 10,673 
Less: Investment expenses (3)(589)(700)(1,158)(1,410)
  Net investment income$11,282 $5,221 $21,980 $9,263 
(1)
Includes interest earned on restricted cash and cash equivalents.
(2)
Includes investment income earned on real estate investments.
(3)
Includes custodial fees, investment accounting and advisory fees, and expenses associated with real estate investments.
Schedule of Details on Realized and Unrealized Gains and Losses Related to Equity Securities
The following table provides the unrealized gains and losses recognized for the periods presented on equity securities still held at the end of the reported period (in thousands):
Three Months Ended
June 30,		Six Months Ended
June 30,
2023202220232022
Unrealized gains (losses) recognized during the reported period on equity securities still held at the end of the reported period$(205)$(8,884)$298 $(12,237)
Schedule of Real Estate Investment
Investment real estate consisted of the following as of the dates presented (in thousands):
June 30,December 31,
20232022
Income Producing:
Investment real estate$7,097 $7,097 
Less: Accumulated depreciation(1,479)(1,386)
Investment real estate, net$5,618 $5,711 
Schedule of Depreciation Expense Related to Investment Real Estate
The following table provides the depreciation expense related to investment real estate for the periods presented (in thousands):
Three Months Ended
June 30,		Six Months Ended
June 30,
 2023202220232022
Depreciation expense on investment real estate$47 $47 $93 $93