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Basis of Presentation and Summary of Significant Accounting Policies (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2026
Accounting Policies [Abstract] |
Schedule of Goodwill and Intangible Assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
(in thousands) |  | 2026 |  | 2025
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 March 31, 2026 | ​ | Ended March 31, 2025
​ | ​ | 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 | ​ | $ | 54,885 | ​ |  | 91,926 | ​ | $ | 0.60 | ​ | $ | 63,214 | ​ |  | 91,770 | ​ | $ | 0.69
Effect of Dilutive Securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Stock options and restricted stock units | ​ | ​ | — | ​ |  | 261 | ​ | ​ | ​ | ​ | ​ | — | ​ |  | 758 | ​ | ​ | ​
Diluted EPS | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Earnings available to common shareholders | ​ | $ | 54,885 | ​ |  | 92,187 | ​ | $ | 0.60 | ​ | $ | 63,214 | ​ |  | 92,528 | ​ | $ | 0.68
Anti-dilutive securities excluded from diluted EPS | ​ | ​ | ​ | ​ | ​ | 1,066 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 48 | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
Schedule of Changes in the Balance of Each Component of Accumulated Other Comprehensive Earnings (Loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) | ​ | For the Three Months | ​
​ | ​ | Ended March 31, | ​
Unrealized Gains (Losses) on Available-for-Sale Securities |  | 2026 |  | 2025 |
Beginning balance | ​ | $ | (88,074) | ​ | $ | (173,723) | ​
Other comprehensive earnings (loss) before reclassifications | ​ | ​ | (25,977) | ​ | ​ | 29,899 | ​
Amounts reclassified from accumulated other comprehensive earnings | ​ | ​ | 611 | ​ | ​ | 131 | ​
Net current-period other comprehensive earnings (loss) | ​ | $ | (25,366) | ​ | $ | 30,030 | ​
Ending balance | ​ | $ | (113,440) | ​ | $ | (143,693) | ​
Balance of securities for which an allowance for credit losses has been recognized in net earnings | ​ | ​ | 1,710 | ​ | ​ | 1,692 | ​
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 | ​ | ​
Component of Accumulated | ​ | Ended March 31, | ​ | Affected line item in the
Other Comprehensive Earnings (Loss) |  | 2026 |  | 2025 |  | Statement of Earnings
Unrealized gains and losses on available-for-sale securities | ​ | $ | (1,063) | ​ | $ | (205) | ​ | Net realized gains (losses)
​ | ​ | ​ | 290 | ​ | ​ | 40 | ​ | Credit gains (losses) presented within net realized gains
​ | ​ | $ | (773) | ​ | $ | (165) | ​ | Earnings (loss) before income taxes
​ | ​ | ​ | 162 | ​ | ​ | 34 | ​ | Income tax (expense) benefit
​ | ​ | $ | (611) | ​ | $ | (131) | ​ | Net earnings (loss)

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