Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Securities available for sale, amortized cost	$ 5,496,718	$ 6,310,214
Securities held to maturity, fair value	2,485,918	2,615,398
Loans held-for-sale, fair value	13,269	10,843
Property and equipment, accumulated depreciation	318,746	303,451
Right of use assets, accumulated amortization	$ 55,815	$ 44,901
Preferred stock, par value per share	$ 20	$ 20
Common stock, par value per share	$ 3.33	$ 3.33