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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Allowance for credit losses - held to maturity securities | $ 32 | $ 32
Securities held to maturity | $ 1,079,123 | $ 1,206,540
Preferred stock, par value (in usd per share) | $ 0.01 | $ 0.01
Preferred stock, shares authorized (in shares) | 5,000,000 | 5,000,000
Preferred stock, shares issued (in shares) | 0 | 0
Preferred stock, shares outstanding (in shares) | 0 | 0
Common stock, par value (in usd per share) | $ 5.00 | $ 5.00
Common stock, shares authorized (in shares) | 150,000,000 | 150,000,000
Common stock, shares issued (in shares) | 59,296,725 | 59,296,725
Common stock, shares outstanding (in shares) | 56,140,713 | 55,953,104
Treasury stock (in shares) | 3,156,012 | 3,343,621

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