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Securities - Schedule of Aging of Past Due Held to Maturity Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Total held to maturity securities | $ 5,837,706 | $ 1,480,416
Competitive [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Total held to maturity securities | 1,078,970 | 999,348
Utilities [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Total held to maturity securities |  | 84,934
State and political subdivisions [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Total held to maturity securities | $ 2,698,212 | 1,084,282
30-89 Days Past Due and Accruing [Member] | Competitive [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Total held to maturity securities |  | 7,795
30-89 Days Past Due and Accruing [Member] | State and political subdivisions [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Total held to maturity securities |  | 7,795
Total Past Due [Member] | Competitive [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Total held to maturity securities |  | 7,795
Total Past Due [Member] | State and political subdivisions [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Total held to maturity securities |  | 7,795
Current [Member] | Competitive [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Total held to maturity securities |  | 991,553
Current [Member] | Utilities [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Total held to maturity securities |  | 84,934
Current [Member] | State and political subdivisions [Member] |  |
Debt Securities Held To Maturity Credit Quality Indicator [Line Items] |  |
Total held to maturity securities |  | $ 1,076,487

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