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CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Available-for-sale [Abstract]
Securities AFS, at estimated fair value	$ 1,307,864	$ 1,587,416
Held-to-maturity Securities, Other Disclosure Items [Abstract]
Securities held-to-maturity, fair value	$ 1,106,186	$ 1,113,482
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)	38,103,037	38,077,992
Shares purchased (in shares)	8,037,536	7,699,182

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