Parent Company Financial Statements - Condensed Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investments in consolidated subsidiaries
Total assets	$ 200,729,841	$ 155,107,160
Liabilities
Long-term borrowings	3,964,537	3,485,369
Total liabilities	175,411,851	137,203,755
Shareholders’ equity	25,317,990	17,903,405	$ 16,187,283	$ 15,716,649
Total liabilities and shareholders’ equity	200,729,841	155,107,160
Parent Company [Member]
Assets
Cash in subsidiary bank	130,311	92,836
Due from consolidated bank subsidiaries
Money-market savings	1,690,157	1,335,857
Current income tax receivable	3,501	754
Total due from consolidated bank subsidiaries	1,693,658	1,336,611
Investments in consolidated subsidiaries
Banks	25,005,239	17,533,772
Other	379,906	220,496
Investments in trust preferred entities (note 20)	22,457	22,672
Other assets	92,802	98,010
Total assets	27,324,373	19,304,397
Liabilities
Accrued expenses and other liabilities	172,001	103,242
Long-term borrowings	1,834,382	1,297,750
Total liabilities	2,006,383	1,400,992
Shareholders’ equity	25,317,990	17,903,405
Total liabilities and shareholders’ equity	$ 27,324,373	$ 19,304,397