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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended					9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2022	Mar. 31, 2020	Sep. 30, 2018	Sep. 30, 2025	Sep. 30, 2024
Cash Transactions:
Interest paid						$ 949,817	$ 1,018,706
Income Taxes Paid						68,699	30,047
Operating lease payments						34,323	28,444
Noncash Transactions:
Loans charged-off to the allowance for credit losses	$ 22,088	$ 23,139				63,118	72,773
Loans foreclosed upon and transferred to other real estate owned						7,302	435
Loans Foreclosed Upon Transferred To Other Assets						185	197
Available-for-sale securities transferred to held-to-maturity portfolio			$ 1,100,000	$ 873,600	$ 179,800
Right of use assets recognized during the period in exchange for lease obligations						$ 102,296	$ 24,064

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