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Net realized and unrealized gains (Tables)
 9 Months Ended
Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]  
Schedule of Gross Realized and Unrealized Gains and Losses Realized and unrealized gains and losses are detailed as follows:
 Three Months Ended 
 September 30,		Nine Months Ended 
 September 30,
 2023202220232022
 ($000 omitted)
Realized gains900 183 1,239 3,460 
Realized losses(307)(65)(4,484)(3,904)
Net unrealized investment losses recognized on equity securities still held at end of period(2,539)(6,492)(1,584)(13,750)
(1,946)(6,374)(4,829)(14,194)
Schedule of Investment Gains and Losses Recognized Related to Investments in Equity Securities
Investment gains and losses recognized related to investments in equity securities are as follows:
Three Months Ended 
 September 30,		Nine Months Ended 
 September 30,
2023202220232022
($000 omitted)
Net investment losses recognized on equity securities during the period(1,738)(6,489)(1,505)(13,284)
Less: Net realized gains on equity securities sold during the period801 3 79 466 
Net unrealized investment losses recognized on equity securities still held at end of period(2,539)(6,492)(1,584)(13,750)
Schedule of Proceeds from Sale of Investments in Securities
The amortized costs and fair values of investments in debt securities are as follows:
 September 30, 2023December 31, 2022
 
Amortized
costs
Fair
values
Amortized
costs
Fair
values
 ($000 omitted)
Municipal23,941 23,278 30,104 29,835 
Corporate250,552 231,038 272,362 254,316 
Foreign321,046 299,748 315,184 299,137 
U.S. Treasury Bonds32,614 31,342 29,078 28,646 
628,153 585,406 646,728 611,934 
Proceeds from sales of investments in securities are as follows: 
 Three Months Ended 
 September 30,		Nine Months Ended 
 September 30,
 2023202220232022
 ($000 omitted)
Proceeds from sales of debt securities10,255 19,123 25,134 47,405 
Proceeds from sales of equity securities3,887 62 28,496 549 
Total proceeds from sales of investments in securities14,142 19,185 53,630 47,954