Mergers and Acquisitions - Summary of Supplemental Pro Forma Information (Details) - Sterling - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Business Acquisition [Line Items]
Net interest income	$ 465,392	$ 440,538	$ 898,741	$ 904,528
Non-interest income	120,933	110,659	235,769	226,967
Net income	$ 213,438	$ 164,073	$ 396,605	$ 186,071