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Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Thousands, $ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Statement of Financial Position [Abstract]    
Available-for-sale, amortized cost $ 8,480,508 $ 7,684,889
Investment securities-held-to-maturity, fair value $ 2,471,138 $ 2,601,188
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) 318,980 292,655
Common stock, shares outstanding (in shares) 318,980 292,655