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Fair Value Measurements - Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and short-term investments | $ 3,240,996 | $ 10,472,084
Securities available for sale | 7,739,216 | 11,976,514
Total held to maturity securities | 5,709,541 | 1,480,416
Trading securities | 9,646 | 31,875
Other securities | 342,543 | 327,098
Loans (exclusive of allowance for credit losses) | 18,972,908 | 17,172,148
Derivatives | 23,626 | 57,680
Demand and savings deposits | 30,932,642 | 34,748,286
Time deposits | 553,382 | 851,641
Other borrowings | 2,661,283 | 3,238,435
Long-term debt | 272,505 | 271,544
Derivatives | 71,268 | 13,944
Estimate of Fair Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and short-term investments | 3,240,996 | 10,472,084
Securities available for sale | 7,739,216 | 11,976,514
Total held to maturity securities | 5,245,451 | 1,442,391
Trading securities | 9,646 | 31,875
Other securities | 342,543 | 327,098
Loans (exclusive of allowance for credit losses) | 18,971,934 | 17,506,662
Derivatives | 23,626 | 57,680
Demand and savings deposits | 30,932,642 | 34,748,286
Time deposits | 553,382 | 851,641
Other borrowings | 2,661,283 | 3,238,435
Long-term debt | 273,596 | 285,961
Derivatives | 71,268 | 13,944
Commitments to extend credit for loans | 4,116 | 7,841
Commercial letters of credit | 113 | 179
Standby letters of credit | 2,074 | 3,553
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 | 2,205,537 | 9,255,727
Securities available for sale | 1,134,537 | 387,020
Trading securities | 3,749 | 5,985
Other securities | 40,639 | 64,149
Demand and savings deposits | 30,932,642 | 34,748,286
Other borrowings | 52,987 | 12,597
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 | 1,035,459 | 1,216,357
Securities available for sale | 6,604,679 | 11,589,494
Total held to maturity securities | 5,245,451 | 1,442,391
Trading securities | 5,897 | 25,890
Other securities | 301,904 | 262,949
Loans (exclusive of allowance for credit losses) | 18,971,934 | 17,506,662
Derivatives | 23,626 | 57,680
Time deposits | 553,382 | 851,641
Other borrowings | 2,608,296 | 3,225,838
Long-term debt | 273,596 | 285,961
Derivatives | $ 71,268 | $ 13,944

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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 https://asc.fasb.org/extlink&oid=126897435&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 https://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 https://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 https://asc.fasb.org/extlink&oid=126970911&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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(9)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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