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Securities - Schedule of Amortized Cost Basis by Credit Rating of Held to Maturity Investment (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | $ 5,837,706 | $ 1,480,416
Competitive [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 1,078,970 | 999,348
Utilities and General Obligation [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 1,619,242 |
State and political subdivisions [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 2,698,212 | 1,084,282
Utilities [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities |  | 84,934
Credit Rating, AAA [Member] | Utilities and General Obligation [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 597,375 |
Credit Rating, AAA [Member] | State and political subdivisions [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 597,375 |
Credit Rating, AA [Member] | Utilities and General Obligation [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 848,057 |
Credit Rating, AA [Member] | State and political subdivisions [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 848,057 |
Credit Rating, A [Member] | Competitive [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 439,191 | 372,696
Credit Rating, A [Member] | Utilities and General Obligation [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 141,796 |
Credit Rating, A [Member] | State and political subdivisions [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 580,987 | 427,792
Credit Rating, A [Member] | Utilities [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities |  | 55,096
Credit Rating, BBB [Member] | Competitive [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 618,217 | 605,104
Credit Rating, BBB [Member] | Utilities and General Obligation [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 31,442 |
Credit Rating, BBB [Member] | State and political subdivisions [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 649,659 | 634,942
Credit Rating, BBB [Member] | Utilities [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities |  | 29,838
Credit Rating, BB [Member] | Competitive [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 17,811 | 20,678
Credit Rating, BB [Member] | Utilities and General Obligation [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 572 |
Credit Rating, BB [Member] | State and political subdivisions [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 18,383 | 20,678
Credit Rating, CCC-C [Member] | Competitive [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 3,751 | 870
Credit Rating, CCC-C [Member] | State and political subdivisions [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | $ 3,751 | $ 870

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