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CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Available-for-sale [Abstract]
Securities AFS, at estimated fair value	$ 1,509,152	$ 1,587,416
Held-to-maturity Securities, Other Disclosure Items [Abstract]
Securities held-to-maturity, fair value	$ 1,109,108	$ 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)	38,086,889	38,077,992
Shares purchased (in shares)	7,676,507	7,699,182

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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