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Securities - Gross Unrealized Losses and Fair Value of Investment Securities Held to Maturity (Detail) $ in Thousands | Jun. 30, 2022 USD ($) Security | Dec. 31, 2021 USD ($) Security
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Schedule Of Held To Maturity Securities [Line Items] |  |
Less than 12 months, Count | Security | 1,584 | 70
Less than 12 months, Fair Value | $ 4,641,195 | $ 903,040
Less than 12 months,Unrealized Losses | $ (414,382) | $ (14,925)
12 months or more, Count | Security | 44 | 28
12 months or more, Fair Value | $ 357,949 | $ 217,579
12 months or more, Unrealized Losses | $ (50,516) | $ (26,460)
Total Count | Security | 1,628 | 98
Total Fair Value | $ 4,999,144 | $ 1,120,619
Total Unrealized Losses | $ (464,898) | $ (41,385)
U.S. Agencies [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Less than 12 months, Count | Security | 11 |
Less than 12 months, Fair Value | $ 121,856 |
Less than 12 months,Unrealized Losses | $ (1,177) |
Total Count | Security | 11 |
Total Fair Value | $ 121,856 |
Total Unrealized Losses | $ (1,177) |
Mortgage-backed [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Less than 12 months, Count | Security | 252 | 12
Less than 12 months, Fair Value | $ 2,843,277 | $ 317,887
Less than 12 months,Unrealized Losses | $ (212,959) | $ (2,431)
Total Count | Security | 252 | 12
Total Fair Value | $ 2,843,277 | $ 317,887
Total Unrealized Losses | $ (212,959) | $ (2,431)
State and political subdivisions [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Less than 12 months, Count | Security | 1,321 | 58
Less than 12 months, Fair Value | $ 1,676,062 | $ 585,153
Less than 12 months,Unrealized Losses | $ (200,246) | $ (12,494)
12 months or more, Count | Security | 44 | 28
12 months or more, Fair Value | $ 357,949 | $ 217,579
12 months or more, Unrealized Losses | $ (50,516) | $ (26,460)
Total Count | Security | 1,365 | 86
Total Fair Value | $ 2,034,011 | $ 802,732
Total Unrealized Losses | $ (250,762) | $ (38,954)

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