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Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Statement of Financial Position [Abstract] |  |
Available-for-sale, amortized cost | $ 7,684,889 | $ 7,772,603
Investment securities-held-to-maturity, fair value | $ 2,601,188 | $ 2,643,682
Preferred stock, shares authorized (in shares) | 2,000 | 2,000
Preferred stock, shares issued (in shares) | 231 | 231
Preferred stock, shares outstanding (in shares) | 231 | 231
Common stock, stated value (in dollars per share) | $ 1.00 | $ 1.00
Authorized and unissued common shares reserved for issuance (in shares) | 600,000 | 600,000
Common stock, shares issued (in shares) | 292,655 | 292,903
Common stock, shares outstanding (in shares) | 292,655 | 292,903

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