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Fair Value Measurements - Changes in Fair Value of Securities Using Level 3 Inputs (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning balance $ 551,689  
Fair value, ending balance 556,762  
Obligations of states and political subdivisions    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning balance 7,834 $ 6,661
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Fair value, ending balance 7,747 6,874
Change in unrealized gains (losses) for the period included in earnings for assets held at period end (1) 61
Change in unrealized gains (losses) for the period included in OCI for assets held at period end (86) 152
Obligations of states and political subdivisions | Other Comprehensive Income (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total net gains (losses) for the period included in OCI (86) 152
Corporate securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning balance 297,332 187,980
Purchases 1,152 24,799
Sales 0 0
Issuances 0 0
Settlements (2,870) (4,044)
Transfers into Level 3 20,065 361
Transfers out of Level 3 (28,227) 0
Fair value, ending balance 287,496 211,585
Change in unrealized gains (losses) for the period included in earnings for assets held at period end 140 72
Change in unrealized gains (losses) for the period included in OCI for assets held at period end (376) 2,405
Corporate securities | Other Comprehensive Income (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total net gains (losses) for the period included in OCI (376) 2,405
CLO and other ABS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning balance 245,313 153,342
Purchases 14,658 13,403
Sales 0 0
Issuances 0 0
Settlements (1,173) (1,192)
Transfers into Level 3 19,537 14,148
Transfers out of Level 3 (18,693) (534)
Fair value, ending balance 260,097 179,758
Change in unrealized gains (losses) for the period included in earnings for assets held at period end 57 (73)
Change in unrealized gains (losses) for the period included in OCI for assets held at period end 399 696
CLO and other ABS | Other Comprehensive Income (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total net gains (losses) for the period included in OCI 399 696
CMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning balance 356 375
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements (3) (3)
Transfers into Level 3 0 2,848
Transfers out of Level 3 0 0
Fair value, ending balance 355 3,236
Change in unrealized gains (losses) for the period included in earnings for assets held at period end 0 0
Change in unrealized gains (losses) for the period included in OCI for assets held at period end 3 17
CMBS | Other Comprehensive Income (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total net gains (losses) for the period included in OCI 3 17
Common stock:    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning balance 854 897
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Fair value, ending balance 1,067 628
Change in unrealized gains (losses) for the period included in earnings for assets held at period end 213 (269)
Change in unrealized gains (losses) for the period included in OCI for assets held at period end 0 0
Common stock: | Other Comprehensive Income (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total net gains (losses) for the period included in OCI 0 0
Investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning balance 551,689 349,255
Purchases 15,810 38,202
Sales 0 0
Issuances 0 0
Settlements (4,046) (5,239)
Transfers into Level 3 39,602 17,357
Transfers out of Level 3 (46,920) (534)
Fair value, ending balance 556,762 402,081
Change in unrealized gains (losses) for the period included in earnings for assets held at period end 409 (209)
Change in unrealized gains (losses) for the period included in OCI for assets held at period end (60) 3,270
Investments | Other Comprehensive Income (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total net gains (losses) for the period included in OCI (60) 3,270
Gain (Loss) on Investments | Obligations of states and political subdivisions    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total net gains (losses) for the period included in net income (1) 61
Gain (Loss) on Investments | Corporate securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total net gains (losses) for the period included in net income 140 72
Gain (Loss) on Investments | CLO and other ABS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total net gains (losses) for the period included in net income 57 (73)
Gain (Loss) on Investments | CMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total net gains (losses) for the period included in net income 0 0
Gain (Loss) on Investments | Common stock:    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total net gains (losses) for the period included in net income 213 (269)
Gain (Loss) on Investments | Investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total net gains (losses) for the period included in net income 409 (209)
Net Investment Income Earned | Obligations of states and political subdivisions    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total net gains (losses) for the period included in net income 0 0
Net Investment Income Earned | Corporate securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total net gains (losses) for the period included in net income 280 12
Net Investment Income Earned | CLO and other ABS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total net gains (losses) for the period included in net income (1) (32)
Net Investment Income Earned | CMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total net gains (losses) for the period included in net income (1) (1)
Net Investment Income Earned | Common stock:    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total net gains (losses) for the period included in net income 0 0
Net Investment Income Earned | Investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total net gains (losses) for the period included in net income $ 278 $ (21)