CONDENSED FINANCIAL INFORMATION (PARENT COMPANY ONLY) - Schedule of Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
ASSETS
Cash and cash equivalents	$ 711,913	$ 687,377
Other assets	643,204	572,385
Total assets	24,540,877	26,876,049	$ 27,345,674
LIABILITIES
Long-term debt	334,967
Total liabilities	21,121,637	23,347,177
STOCKHOLDERS’ EQUITY
Common stock	1,448	1,257
Surplus	2,846,581	2,511,590
Undivided profits	864,341	1,376,935
Total stockholders’ equity	3,419,240	3,528,872	$ 3,426,488	$ 3,269,362
Total liabilities and stockholders’ equity	24,540,877	26,876,049
Parent Company
ASSETS
Cash and cash equivalents	542,602	287,066
Investments in wholly-owned subsidiaries	3,197,586	3,570,446
Intangible assets, net	133	133
Premises and equipment	17,835	18,929
Other assets	32,504	75,707
Total assets	3,790,660	3,952,281
LIABILITIES
Long-term debt	333,370	383,720
Other liabilities	38,050	39,689
Total liabilities	371,420	423,409
STOCKHOLDERS’ EQUITY
Common stock	1,448	1,257
Surplus	2,846,581	2,511,590
Undivided profits	864,341	1,376,935
Unrealized depreciation on available-for-sale securities, net of income taxes of $(103,716) and $(127,698) at December 31, 2025 and 2024, respectively	(293,130)	(360,910)
Total stockholders’ equity	3,419,240	3,528,872
Total liabilities and stockholders’ equity	$ 3,790,660	$ 3,952,281