Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Statement of Financial Position [Abstract]
Securities available for sale, amortized cost	$ 5,845,045	$ 5,774,133
Securities held to maturity, fair value	2,194,627	2,233,526
Loans held-for-sale, fair value	25,935	18,929
Property and equipment, accumulated depreciation	352,609	345,962
Right of use assets, accumulated amortization	$ 70,411	$ 67,063
Preferred stock, par value per share	$ 20	$ 20
Common stock, par value per share	$ 3.33	$ 3.33