Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Securities available for sale, amortized cost	$ 5,535,212	$ 5,496,718
Securities held to maturity, fair value	2,436,610	2,485,918
Loans held-for-sale, fair value	15,208	13,269
Property and equipment, accumulated depreciation	326,472	318,746
Right of use assets, accumulated amortization	$ 58,824	$ 55,815
Preferred stock, par value per share	$ 20	$ 20
Common stock, par value per share	$ 3.33	$ 3.33