Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended					9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Mar. 31, 2022	Mar. 31, 2020	Sep. 30, 2018	Sep. 30, 2023	Sep. 30, 2022
Cash Transactions:
Interest paid						$ 714,827	$ 114,326
Income Taxes Paid						96,698	115,090
Operating lease payments	$ 11,790	$ 5,859				22,648	13,528
Noncash Transactions:
Loans charged-off to the allowance for credit losses	$ 24,709	$ 17,699				57,616	33,384
Loans foreclosed upon and transferred to other real estate owned						435	65
Loans Foreclosed Upon Transferred To Other Assets						561	0
Available-for-sale securities transferred to held-to-maturity portfolio			$ 1,100,000	$ 873,600	$ 179,800	0	1,059,737
Right of use assets recognized during the period in exchange for lease obligations						$ 195,995	$ 31,333