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Earnings per common share - Computations of Basic Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Income available to common shareholders: |  |  |  |
Net income | $ 792,000 | $ 721,000 | $ 2,092,000 | $ 1,907,000
Less: Preferred stock dividends | (36,000) | (47,000) | (107,000) | (99,000)
Net income available to common equity | 756,000 | 674,000 | 1,985,000 | 1,808,000
Less: Income attributable to unvested stock-based compensation awards | (2,000) | 0 | (4,000) | (3,000)
Net income available to common shareholders | $ 754,000 | $ 674,000 | $ 1,981,000 | $ 1,805,000
Weighted-average shares outstanding: |  |  |  |
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards (in shares) | 155,885 | 167,011 | 159,956 | 167,010
Less: Unvested stock-based compensation awards (in shares) | (327) | (340) | (325) | (316)
Weighted-average shares outstanding (in shares) | 155,558 | 166,671 | 159,631 | 166,694
Basic earnings per common share (in USD per share) | $ 4.85 | $ 4.04 | $ 12.41 | $ 10.83

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