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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Statement of Financial Position [Abstract]
Securities available for sale, amortized cost	$ 6,287,446	$ 6,341,322
Securities held to maturity, fair value	1,926,729	2,011,026
Loans held-for-sale, fair value	36,477	33,158
Property and equipment, accumulated depreciation	371,743	370,818
Right of use assets, accumulated amortization	$ 77,077	$ 73,527
Preferred stock, par value per share	$ 20	$ 20
Common stock, par value per share	$ 3.33	$ 3.33

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