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Fair Value Measurements - Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | $ 15,184,395 | $ 10,288,853 | $ 6,599,568 | $ 3,788,181
Securities held to maturity | 1,813,563 | 1,945,833 |  |
Loans, net | 16,341,038 | 17,218,132 |  |
Deposits | 38,734,140 | 35,015,761 |  |
Federal funds purchased | 26,700 | 48,850 |  |
Repurchase agreements | 2,216,889 | 2,068,147 |  |
Junior subordinated deferrable interest debentures, net of unamortized issuance costs | 136,385 | 136,357 |  |
Subordinated notes | 99,100 | 99,021 |  |
Carrying Amount [Member] | Level 2 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 15,184,395 | 10,288,853 |  |
Securities held to maturity | 1,813,405 | 1,945,673 |  |
Cash surrender value of life insurance policies | 189,818 | 189,984 |  |
Accrued interest receivable | 176,226 | 181,432 |  |
Deposits | 38,734,140 | 35,015,761 |  |
Federal funds purchased | 26,700 | 48,850 |  |
Repurchase agreements | 2,216,889 | 2,068,147 |  |
Junior subordinated deferrable interest debentures, net of unamortized issuance costs | 136,385 | 136,357 |  |
Subordinated notes | 99,100 | 99,021 |  |
Accrued interest payable | 3,799 | 8,127 |  |
Carrying Amount [Member] | Level 3 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Loans, net | 16,341,038 | 17,218,132 |  |
Estimated Fair Value [Member] | Level 2 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 15,184,395 | 10,288,853 |  |
Securities held to maturity | 1,896,235 | 2,052,896 |  |
Cash surrender value of life insurance policies | 189,818 | 189,984 |  |
Accrued interest receivable | 176,226 | 181,432 |  |
Deposits | 38,735,017 | 35,018,185 |  |
Federal funds purchased | 26,700 | 48,850 |  |
Repurchase agreements | 2,216,889 | 2,068,147 |  |
Junior subordinated deferrable interest debentures, net of unamortized issuance costs | 137,115 | 137,115 |  |
Subordinated notes | 114,015 | 115,717 |  |
Accrued interest payable | 3,799 | 8,127 |  |
Estimated Fair Value [Member] | Level 3 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Loans, net | $ 16,444,306 | $ 17,390,683 |  |

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- Definition The sum of cash and cash equivalents plus Federal Funds Sold. Cash and cash equivalents consist of short term, highly liquid investments that are readily convertible to known amounts of cash and are so near their maturity that they present negligible risk of changes in value due to changes in interest rates -- usually with an original maturity less than 90 days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.1,2,3) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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