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Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Investment securities:
Securities held to maturity, fair value (in dollars)	$ 1,684,138	$ 1,732,850
Shareholders' equity:
Common stock, par value (in dollars per share)	$ 2.5	$ 2.5
Common stock, shares authorized	160,000,000	160,000,000
Common stock, shares issued	97,937,653	99,138,204
Common stock, shares outstanding	97,937,653	99,138,204

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