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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Statement of Financial Position [Abstract]    
Securities held-to-maturity, fair value $ 2,432,068 $ 2,560,252
Allowance for credit losses - securities held-to-maturity $ (1,707) $ (1,707)
Preferred stock, par value (in dollars per share) $ 0 $ 0
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000
Preferred stock, shares issued (in shares) 225,000 225,000
Preferred stock, shares outstanding (in shares) 225,000 225,000
Preferred Stock, Liquidation Preference Per Share $ 1,000 $ 1,000
Common stock, par value (in dollars per share) $ 1.00 $ 1.00
Common stock, shares authorized (in shares) 180,000,000 180,000,000
Common stock, shares issued (in shares) 77,558,000 77,242,000
Common stock, shares outstanding (in shares) 77,558,000 77,242,000