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Fair Value Measurements - Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | $ 7,618,083 | $ 12,028,132 | $ 13,632,698 | $ 16,583,000
Securities held to maturity, net of allowance for credit losses of $310 at September 30, 2023 and $158 at December 31, 2022 | 3,628,123 | 2,639,083 |  |
Loans, net | 18,157,024 | 16,927,348 |  |
Deposits | 40,992,235 | 43,954,196 |  |
Federal funds purchased | 25,950 | 51,650 |  |
Repurchase agreements | 3,722,245 | 4,660,641 |  |
Junior subordinated deferrable interest debentures | 123,112 | 123,069 |  |
Subordinated notes | 99,452 | 99,335 |  |
Carrying Amount [Member] | Level 2 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 7,618,083 | 12,028,132 |  |
Securities held to maturity, net of allowance for credit losses of $310 at September 30, 2023 and $158 at December 31, 2022 | 3,628,123 | 2,639,083 |  |
Accrued interest receivable | 199,344 | 243,682 |  |
Deposits | 40,992,235 | 43,954,196 |  |
Federal funds purchased | 25,950 | 51,650 |  |
Repurchase agreements | 3,722,245 | 4,660,641 |  |
Junior subordinated deferrable interest debentures | 123,112 | 123,069 |  |
Subordinated notes | 99,452 | 99,335 |  |
Accrued interest payable | 51,468 | 18,444 |  |
Carrying Amount [Member] | Level 3 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Loans, net | 18,157,024 | 16,927,348 |  |
Estimated Fair Value [Member] | Level 2 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 7,618,083 | 12,028,132 |  |
Securities held to maturity, net of allowance for credit losses of $310 at September 30, 2023 and $158 at December 31, 2022 | 3,231,691 | 2,467,865 |  |
Accrued interest receivable | 199,344 | 243,682 |  |
Deposits | 40,971,688 | 43,920,741 |  |
Federal funds purchased | 25,950 | 51,650 |  |
Repurchase agreements | 3,722,245 | 4,660,641 |  |
Junior subordinated deferrable interest debentures | 123,712 | 123,712 |  |
Subordinated notes | 94,311 | 97,014 |  |
Accrued interest payable | 51,468 | 18,444 |  |
Estimated Fair Value [Member] | Level 3 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Loans, net | $ 17,496,332 | $ 16,343,417 |  |

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-8 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-24 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-4 + Details
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