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CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Available-for-sale [Abstract] |  |
Securities AFS, at estimated fair value | $ 1,472,520 | $ 1,387,874
Held-to-maturity Securities, Other Disclosure Items [Abstract] |  |
Securities held-to-maturity, fair value | $ 1,052,430 | $ 1,149,156
Shareholders' equity: |  |
Common stock, par value (in dollars per share) | $ 1.25 | $ 1.25
Common stock, shares authorized (in shares) | 80,000,000 | 80,000,000
Common stock, shares issued (in shares) | 38,029,245 | 38,000,822
Shares purchased (in shares) | 7,691,151 | 6,454,192

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