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Securities - Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities, Presented by Contractual Maturity (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Schedule of Investments [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | $ 429,868 |
Held to Maturity, Due after one year through five years, Amortized Cost | 120,016 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 571,577 |
Held to Maturity, Due after ten years, Amortized Cost | 544,162 |
Held to Maturity, Amortized Cost | 1,665,623 | $ 1,749,337
Held to Maturity, Due in one year or less, Estimated Fair Value | 431,977 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 121,182 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 555,051 |
Held to Maturity, Due after ten years, Estimated Fair Value | 531,783 |
Held to Maturity, Estimated Fair Value | 1,639,993 | 1,809,143
Available-for-sale Securities, Due in one year or less, Amortized Cost | 194,518 |
Available for Sale, Due after one year through five years, Amortized Cost | 3,610,741 |
Available for Sale, Due after five years through ten years, Amortized Cost | 2,340,280 |
Available for Sale, Due after ten years, Amortized Cost | 10,428,694 |
Debt Securities, Available-for-sale, Amortized Cost | 16,616,594 | 13,445,888
Available for Sale, Due in one year or less, Estimated Fair Value | 197,334 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 3,596,062 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 2,269,482 |
Available for Sale, Due after ten years, Estimated Fair Value | 10,079,300 |
Securities available for sale, at estimated fair value | 16,184,539 | 13,924,628
US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Due in one year or less, Amortized Cost | 0 |
Available for Sale, Due after one year through five years, Amortized Cost | 2,033,995 |
Available for Sale, Due after five years through ten years, Amortized Cost | 1,432,731 |
Available for Sale, Due after ten years, Amortized Cost | 191,780 |
Debt Securities, Available-for-sale, Amortized Cost | 3,658,506 | 2,165,702
Available for Sale, Due in one year or less, Estimated Fair Value | 0 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 1,978,865 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 1,350,553 |
Available for Sale, Due after ten years, Estimated Fair Value | 178,328 |
Securities available for sale, at estimated fair value | 3,507,746 | 2,179,433
Residential Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | 16 |
Held to Maturity, Due after one year through five years, Amortized Cost | 0 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 514,842 |
Held to Maturity, Due after ten years, Amortized Cost | 12,111 |
Held to Maturity, Amortized Cost | 526,969 | 527,264
Held to Maturity, Due in one year or less, Estimated Fair Value | 16 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 0 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 498,078 |
Held to Maturity, Due after ten years, Estimated Fair Value | 11,356 |
Held to Maturity, Estimated Fair Value | 509,450 | 546,030
Available-for-sale Securities, Due in one year or less, Amortized Cost | 102 |
Available for Sale, Due after one year through five years, Amortized Cost | 12,917 |
Available for Sale, Due after five years through ten years, Amortized Cost | 19,060 |
Available for Sale, Due after ten years, Amortized Cost | 5,664,827 |
Debt Securities, Available-for-sale, Amortized Cost | 5,696,906 | 4,059,692
Available for Sale, Due in one year or less, Estimated Fair Value | 103 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 13,212 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 19,327 |
Available for Sale, Due after ten years, Estimated Fair Value | 5,343,397 |
Securities available for sale, at estimated fair value | 5,376,039 | 4,066,265
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | 429,852 |
Held to Maturity, Due after one year through five years, Amortized Cost | 118,516 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 56,735 |
Held to Maturity, Due after ten years, Amortized Cost | 532,051 |
Held to Maturity, Amortized Cost | 1,137,154 | 1,220,573
Held to Maturity, Due in one year or less, Estimated Fair Value | 431,961 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 119,698 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 56,973 |
Held to Maturity, Due after ten years, Estimated Fair Value | 520,427 |
Held to Maturity, Estimated Fair Value | 1,129,059 | 1,261,613
Available-for-sale Securities, Due in one year or less, Amortized Cost | 194,416 |
Available for Sale, Due after one year through five years, Amortized Cost | 1,563,829 |
Available for Sale, Due after five years through ten years, Amortized Cost | 888,489 |
Available for Sale, Due after ten years, Amortized Cost | 4,572,087 |
Debt Securities, Available-for-sale, Amortized Cost | 7,218,821 | 7,178,135
Available for Sale, Due in one year or less, Estimated Fair Value | 197,231 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 1,603,985 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 899,602 |
Available for Sale, Due after ten years, Estimated Fair Value | 4,557,575 |
Securities available for sale, at estimated fair value | 7,258,393 | 7,636,571
Other Investments [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | 0 |
Held to Maturity, Due after one year through five years, Amortized Cost | 1,500 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 0 |
Held to Maturity, Due after ten years, Amortized Cost | 0 |
Held to Maturity, Amortized Cost | 1,500 | 1,500
Held to Maturity, Due in one year or less, Estimated Fair Value | 0 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 1,484 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 0 |
Held to Maturity, Due after ten years, Estimated Fair Value | 0 |
Held to Maturity, Estimated Fair Value | 1,484 | 1,500
Available-for-sale Securities, Due in one year or less, Amortized Cost | 0 |
Available for Sale, Due after one year through five years, Amortized Cost | 0 |
Available for Sale, Due after five years through ten years, Amortized Cost | 0 |
Available for Sale, Due after ten years, Amortized Cost | 0 |
Debt Securities, Available-for-sale, Amortized Cost | 42,361 | 42,359
Available for Sale, Due in one year or less, Estimated Fair Value | 0 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 0 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 0 |
Available for Sale, Due after ten years, Estimated Fair Value | 0 |
Securities available for sale, at estimated fair value | $ 42,361 | $ 42,359

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