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CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Available-for-sale [Abstract]
Securities AFS, at estimated fair value	$ 1,433,097	$ 1,332,467
Held-to-maturity Securities, Other Disclosure Items [Abstract]
Securities held-to-maturity, fair value	$ 1,169,523	$ 1,166,162
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)	38,070,150	38,039,706
Shares purchased (in shares)	7,762,336	7,790,276

X

- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Face amount or stated value per share of common stock.

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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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Number of previously issued common shares repurchased by the issuing entity and held in treasury.

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