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Securities - Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities, Presented by Contractual Maturity (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Schedule of Investments [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | $ 25,717 |
Held to Maturity, Due after one year through five years, Amortized Cost | 341,781 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 942,200 |
Held to Maturity, Due after ten years, Amortized Cost | 659,428 |
Held to Maturity, Amortized Cost | 1,969,126 | $ 2,030,005
Held to Maturity, Due in one year or less, Estimated Fair Value | 25,991 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 355,639 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 1,000,148 |
Held to Maturity, Due after ten years, Estimated Fair Value | 691,663 |
Held to Maturity, Estimated Fair Value | 2,073,441 | 2,048,675
Available-for-sale Securities, Due in one year or less, Amortized Cost | 275,214 |
Available for Sale, Due after one year through five years, Amortized Cost | 1,552,260 |
Available for Sale, Due after five years through ten years, Amortized Cost | 663,488 |
Available for Sale, Due after ten years, Amortized Cost | 7,403,995 |
Available for Sale, Amortized Cost | 9,937,236 | 10,877,769
Available for Sale, Due in one year or less, Estimated Fair Value | 277,201 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 1,633,461 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 720,056 |
Available for Sale, Due after ten years, Estimated Fair Value | 7,933,699 |
Securities available for sale, estimated fair value | 10,606,696 | 11,269,591
US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Due in one year or less, Amortized Cost | 33,986 |
Available for Sale, Due after one year through five years, Amortized Cost | 1,083,881 |
Available for Sale, Due after five years through ten years, Amortized Cost | 0 |
Available for Sale, Due after ten years, Amortized Cost | 0 |
Available for Sale, Amortized Cost | 1,117,867 | 1,941,283
Available for Sale, Due in one year or less, Estimated Fair Value | 34,067 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 1,129,568 |
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, estimated fair value | 1,163,635 | 1,948,133
Residential Mortgage Backed Securities [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 | 285 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 516,618 |
Held to Maturity, Due after ten years, Amortized Cost | 12,965 |
Held to Maturity, Amortized Cost | 529,868 | 530,861
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 | 287 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 560,606 |
Held to Maturity, Due after ten years, Estimated Fair Value | 14,218 |
Held to Maturity, Estimated Fair Value | 575,111 | 521,518
Available-for-sale Securities, Due in one year or less, Amortized Cost | 126 |
Available for Sale, Due after one year through five years, Amortized Cost | 57,223 |
Available for Sale, Due after five years through ten years, Amortized Cost | 5,424 |
Available for Sale, Due after ten years, Amortized Cost | 1,988,913 |
Available for Sale, Amortized Cost | 2,051,686 | 2,176,275
Available for Sale, Due in one year or less, Estimated Fair Value | 133 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 59,793 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 5,967 |
Available for Sale, Due after ten years, Estimated Fair Value | 2,065,394 |
Securities available for sale, estimated fair value | 2,131,287 | 2,207,594
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | 25,717 |
Held to Maturity, Due after one year through five years, Amortized Cost | 339,996 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 425,582 |
Held to Maturity, Due after ten years, Amortized Cost | 646,463 |
Held to Maturity, Amortized Cost | 1,437,758 | 1,497,644
Held to Maturity, Due in one year or less, Estimated Fair Value | 25,991 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 353,852 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 439,542 |
Held to Maturity, Due after ten years, Estimated Fair Value | 677,445 |
Held to Maturity, Estimated Fair Value | 1,496,830 | 1,525,657
Available-for-sale Securities, Due in one year or less, Amortized Cost | 241,102 |
Available for Sale, Due after one year through five years, Amortized Cost | 411,156 |
Available for Sale, Due after five years through ten years, Amortized Cost | 658,064 |
Available for Sale, Due after ten years, Amortized Cost | 5,415,082 |
Available for Sale, Amortized Cost | 6,725,404 | 6,717,344
Available for Sale, Due in one year or less, Estimated Fair Value | 243,001 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 444,100 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 714,089 |
Available for Sale, Due after ten years, Estimated Fair Value | 5,868,305 |
Securities available for sale, estimated fair value | 7,269,495 | 7,070,997
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 | 1,500 |
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 | 1,500 | 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 |
Available for Sale, Amortized Cost | 42,279 | 42,867
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, estimated fair value | $ 42,279 | $ 42,867

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