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Securities (Year End Securities Held to Maturity and Available for Sale) (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Investments [Line Items] |  |
Held to Maturity, Amortized Cost | $ 2,030,005 | $ 1,106,057
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 28,931 | 11,533
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 10,261 | 637
Held to Maturity, Estimated Fair Value | 2,048,675 | 1,116,953
Available for Sale, Amortized Cost | 10,877,769 | 11,410,447
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 405,399 | 85,611
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 13,577 | 108,737
Available for Sale, Estimated Fair Value | 11,269,591 | 11,387,321
US Treasury [Member] |  |
Schedule of Investments [Line Items] |  |
Available for Sale, Amortized Cost | 1,941,283 | 3,455,417
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 18,934 | 1,772
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 12,084 | 29,500
Available for Sale, Estimated Fair Value | 1,948,133 | 3,427,689
Residential Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Amortized Cost | 530,861 | 2,737
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 22 | 8
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 9,365 | 85
Held to Maturity, Estimated Fair Value | 521,518 | 2,660
Available for Sale, Amortized Cost | 2,176,275 | 823,208
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 32,608 | 13,079
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1,289 | 6,547
Available for Sale, Estimated Fair Value | 2,207,594 | 829,740
States and Political Subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Amortized Cost | 1,497,644 | 1,101,820
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 28,909 | 11,525
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 896 | 552
Held to Maturity, Estimated Fair Value | 1,525,657 | 1,112,793
Available for Sale, Amortized Cost | 6,717,344 | 7,089,132
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 353,857 | 70,760
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 204 | 72,690
Available for Sale, Estimated Fair Value | 7,070,997 | 7,087,202
Other [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Amortized Cost | 1,500 | 1,500
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Held to Maturity, Estimated Fair Value | 1,500 | 1,500
Available for Sale, Amortized Cost | 42,867 | 42,690
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Available for Sale, Estimated Fair Value | $ 42,867 | $ 42,690

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