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Basis of Presentation and Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2025
Accounting Policies [Abstract] |
Schedule of Goodwill and Intangible Assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31,
(in thousands) |  | 2025 |  | 2024
Goodwill | ​ | ​ | ​ | ​ | ​ | ​
Surety | ​ | $ | 40,816 | ​ | $ | 40,816
Casualty | ​ | ​ | 5,246 | ​ | ​ | 5,246
Total goodwill | ​ | $ | 46,062 | ​ | $ | 46,062
Indefinite-lived intangibles | ​ | ​ | 7,500 | ​ | ​ | 7,500
Total goodwill and intangibles | ​ | $ | 53,562 | ​ | $ | 53,562
Schedule of Reconciliation of Numerator and Denominator of the Basic and Diluted Earnings Per Share Computations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Three Months | ​ | For the Three Months
​ | ​ | Ended September 30, 2025 | ​ | Ended September 30, 2024
​ | ​ | Income | ​ | Shares | ​ | Per Share | ​ | Income | ​ | Shares | ​ | Per Share
(in thousands, except per share data) |  | (Numerator) |  | (Denominator) |  | Amount |  | (Numerator) |  | (Denominator) |  | Amount
Basic EPS | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Earnings available to common shareholders | ​ | $ | 124,610 | ​ |  | 91,849 | ​ | $ | 1.36 | ​ | $ | 95,027 | ​ |  | 91,559 | ​ | $ | 1.04
Effect of Dilutive Securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Stock options and restricted stock units | ​ | ​ | — | ​ |  | 461 | ​ | ​ | ​ | ​ | ​ | — | ​ |  | 882 | ​ | ​ | ​
Diluted EPS | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Earnings available to common shareholders | ​ | $ | 124,610 | ​ |  | 92,310 | ​ | $ | 1.35 | ​ | $ | 95,027 | ​ |  | 92,441 | ​ | $ | 1.03
Anti-dilutive securities excluded from diluted EPS | ​ | ​ | ​ | ​ | ​ | 819 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 48 | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Nine Months | ​ | For the Nine Months
​ | ​ | Ended September 30, 2025 | ​ | Ended September 30, 2024
​ | ​ | Income | ​ | Shares | ​ | Per Share | ​ | Income | ​ | Shares | ​ | Per Share
(in thousands, except per share data) |  | (Numerator) |  | (Denominator) |  | Amount |  | (Numerator) |  | (Denominator) |  | Amount
Basic EPS | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Earnings available to common shareholders | ​ | $ | 312,160 | ​ |  | 91,816 | ​ | $ | 3.40 | ​ | $ | 304,919 | ​ |  | 91,467 | ​ | $ | 3.33
Effect of Dilutive Securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Stock options and restricted stock units | ​ | ​ | — | ​ |  | 644 | ​ | ​ | ​ | ​ | ​ | — | ​ |  | 903 | ​ | ​ | ​
Diluted EPS | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Earnings available to common shareholders | ​ | $ | 312,160 | ​ |  | 92,460 | ​ | $ | 3.38 | ​ | $ | 304,919 | ​ |  | 92,370 | ​ | $ | 3.30
Anti-dilutive securities excluded from diluted EPS | ​ | ​ | ​ | ​ | ​ | 209 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 48 | ​ | ​ | ​
​
Schedule of Changes in the Balance of Each Component of Accumulated Other Comprehensive Earnings (Loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) | ​ | For the Three Months | ​ | For the Nine Months
​ | ​ | Ended September 30, | ​ | Ended September 30,
Unrealized Gains (Losses) on Available-for-Sale Securities |  | 2025 |  | 2024 |  | 2025 |  | 2024
Beginning balance | ​ | $ | (124,992) | ​ | $ | (186,817) | ​ | $ | (173,723) | ​ | $ | (166,303)
Other comprehensive earnings (loss) before reclassifications | ​ | ​ | 29,431 | ​ | ​ | 79,210 | ​ | ​ | 77,253 | ​ | ​ | 57,364
Amounts reclassified from accumulated other comprehensive earnings | ​ | ​ | (1,757) | ​ | ​ | 1,083 | ​ | ​ | (848) | ​ | ​ | 2,415
Net current-period other comprehensive earnings (loss) | ​ | $ | 27,674 | ​ | $ | 80,293 | ​ | $ | 76,405 | ​ | $ | 59,779
Ending balance | ​ | $ | (97,318) | ​ | $ | (106,524) | ​ | $ | (97,318) | ​ | $ | (106,524)
Balance of securities for which an allowance for credit losses has been recognized in net earnings | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 1,715 | ​ | $ | 1,813
Schedule of Effects of Reclassifications out of Accumulated Other Comprehensive Earnings (Loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amount Reclassified from Accumulated Other | ​ | ​ | ​
(in thousands) | ​ | Comprehensive Earnings (Loss) | ​ | ​ | ​
​ | ​ | For the Three Months | ​ | For the Nine Months | ​ | ​ | ​
Component of Accumulated | ​ | Ended September 30, | ​ | Ended September 30, | ​ | ​ | Affected line item in the
Other Comprehensive Earnings (Loss) |  | 2025 |  | 2024 |  | 2025 |  | 2024 |  |  | Statement of Earnings
Unrealized gains and losses on available-for-sale securities | ​ | $ | 2,878 | ​ | $ | (1,365) | ​ | $ | 1,775 | ​ | $ | (3,129) | ​ | ​ | Net realized gains (losses)
​ | ​ | ​ | (654) | ​ | ​ | (6) | ​ | ​ | (702) | ​ | ​ | 72 | ​ | ​ | Credit gains (losses) presented within net realized gains
​ | ​ | $ | 2,224 | ​ | $ | (1,371) | ​ | $ | 1,073 | ​ | $ | (3,057) | ​ | ​ | Earnings (loss) before income taxes
​ | ​ | ​ | (467) | ​ | ​ | 288 | ​ | ​ | (225) | ​ | ​ | 642 | ​ | ​ | Income tax (expense) benefit
​ | ​ | $ | 1,757 | ​ | $ | (1,083) | ​ | $ | 848 | ​ | $ | (2,415) | ​ | ​ | Net earnings (loss)

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