Parent Company Information - Components of Condensed Income Statement The Parent Company (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income:
Total income	$ 1,078,596	$ 479,361	$ 417,724
Expense:
Other non-interest expense	180,088	77,341	78,228
Income (loss) before income taxes and equity in undistributed earnings of subsidiaries	797,977	533,861	279,974
Income tax benefit	(153,694)	(124,997)	(59,353)
Net income	644,283	408,864	220,621
Parent Company
Income:
Dividend income from bank subsidiary	475,000	200,000	20,000
Interest income on securities and interest-bearing deposits	5,955	3,444	5,530
Alternative investments income	6,416	13,033	2,467
Other non-interest income	112	75	634
Total income	487,483	216,552	28,631
Expense:
Interest expense on borrowings	34,284	16,876	18,684
Merger-related expenses	40,314	16,266	0
Other non-interest expense	22,592	15,921	16,426
Total expense	97,190	49,063	35,110
Income (loss) before income taxes and equity in undistributed earnings of subsidiaries	390,293	167,489	(6,479)
Income tax benefit	20,799	3,121	4,572
Equity in undistributed earnings of subsidiaries	233,191	238,254	222,528
Net income	$ 644,283	$ 408,864	$ 220,621