Mergers and Acquisitions - Summary of Supplemental Pro Forma Information (Details) - Sterling - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Business Acquisition [Line Items]
Net interest income	$ 538,125	$ 440,300	$ 1,436,867	$ 1,344,827
Non-interest income	113,636	120,961	349,405	347,928
Net income	$ 239,569	$ 181,980	$ 636,174	$ 368,051