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Fair Value Measurements - Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and short-term investments	$ 7,258,214	$ 5,191,015
Securities available for sale	11,162,690	9,299,688
Securities held to maturity (exclusive of allowance for credit losses)	1,089,424	1,014,614
Trading securities	68,882	35,020
Other securities	274,645	296,053
Loans (exclusive of allowance for credit losses)	16,474,108	16,110,359
Derivatives	68,701	103,554
Demand and savings deposits	30,651,129	26,175,156
Time deposits	584,681	876,095
Other borrowings	2,500,340	2,315,497
Long-term debt	271,049	269,595
Derivatives	13,860	9,375
Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and short-term investments	7,258,214	5,191,015
Securities available for sale	11,162,690	9,299,688
Securities held to maturity (exclusive of allowance for credit losses)	1,064,816	1,029,444
Trading securities	68,882	35,020
Other securities	274,645	296,053
Loans (exclusive of allowance for credit losses)	16,682,840	16,413,132
Derivatives	68,701	103,554
Demand and savings deposits	30,651,129	26,175,156
Time deposits	584,681	879,841
Other borrowings	2,500,340	2,315,497
Long-term debt	290,064	299,858
Derivatives	13,860	9,375
Commitments to extend credit for loans	5,652	6,405
Commercial letters of credit	166	150
Standby letters of credit	2,659	3,365
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and short-term investments	6,166,110	3,540,680
Securities available for sale	236,911	111,939
Trading securities	32,325	14,903
Other securities	66,316	134,197
Demand and savings deposits	30,651,129	26,175,156
Other borrowings	110,722	65,636
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and short-term investments	1,092,104	1,650,335
Securities available for sale	10,925,779	9,187,749
Securities held to maturity (exclusive of allowance for credit losses)	1,064,816	1,029,444
Trading securities	36,557	20,117
Other securities	208,329	161,856
Loans (exclusive of allowance for credit losses)	16,682,840	16,413,132
Derivatives	68,701	103,554
Time deposits	584,681	879,841
Other borrowings	2,389,618	2,249,861
Long-term debt	290,064	299,858
Derivatives	$ 13,860	$ 9,375

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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