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Securities - Schedule of Amortized Cost Basis by Credit Rating of Held to Maturity Investment (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | $ 5,709,541 | $ 1,480,416
Competitive [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 1,040,601 | 999,348
Utilities and General Obligation [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 1,457,093 |
State and political subdivisions [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 2,497,694 | 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 | 576,670 |
Credit Rating, AAA [Member] | State and political subdivisions [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 576,670 |
Credit Rating, AA [Member] | Utilities and General Obligation [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 769,033 |
Credit Rating, AA [Member] | State and political subdivisions [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 769,033 |
Credit Rating, A [Member] | Competitive [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 392,343 | 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 | 84,104 |
Credit Rating, A [Member] | State and political subdivisions [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 476,447 | 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 | 628,494 | 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 | 26,722 |
Credit Rating, BBB [Member] | State and political subdivisions [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 655,216 | 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 | 18,975 | 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 | 564 |
Credit Rating, BB [Member] | State and political subdivisions [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 19,539 | 20,678
Credit Rating, CCC-C [Member] | Competitive [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Held to maturity securities | 789 | 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 | $ 789 | $ 870

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