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Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Thousands, $ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Statement of Financial Position [Abstract]    
Investment securities-available-for-sale, fair value $ 7,592,765 $ 7,772,603
Investment securities - held-to-maturity, fair value $ 2,663,374 $ 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) 291,922 292,903
Common stock, shares outstanding (in shares) 291,922 292,903