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Net income per share and common dividends - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Payment of preferred dividends | $ 3,805 | $ 3,400 | $ 3,285
Preferred stock dividend accrued | $ 400 | $ 600 |
Restricted stock units |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 |  | 89,042
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 370,364 |  |
Number of share outstanding |  | 716,452 | 908,209
Stock Appreciation Rights (SARs) [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 |  | 131,895
Exercise price | $ 9.2 |  |
Number of share outstanding | 0 | 176,360 | 532,642
Common Stock |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Cash dividends | $ 45,100 | $ 47,200 |

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