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Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Thousands, $ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Statement of Financial Position [Abstract]    
Available-for-sale, amortized cost $ 12,144,753 $ 8,480,508
Investment securities - held-to-maturity, fair value $ 2,518,672 $ 2,471,138
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) 390,768 318,980
Common stock, shares outstanding (in shares) 390,768 318,980