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Fair Value Measurements - Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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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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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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