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Securities - Continuous Unrealized-Loss Position of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
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Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Fair Value | $ 214,626 | $ 456,673 | $ 138,456
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Unrealized Loss | (1,378) | (8,507) | (410)
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Fair Value | 3,736,212 | 3,967,472 | 4,198,372
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss | (412,552) | (529,712) | (421,788)
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair value,Total | 3,950,838 | 4,424,145 | 4,336,828
Available-for-sale securities, continuous unrealized loss position, Unrealized Loss | (413,930) | (538,219) | (422,198)
U.S. Treasury Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Fair Value | 1,000 | 0 | 0
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Unrealized Loss | 0 | 0 | 0
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Fair Value | 99,476 | 271,088 | 290,535
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss | (897) | (4,595) | (5,671)
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair value,Total | 100,476 | 271,088 | 290,535
Available-for-sale securities, continuous unrealized loss position, Unrealized Loss | (897) | (4,595) | (5,671)
Obligations of State and Political Subdivisions [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Fair Value | 21,278 | 56,777 | 6,899
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Unrealized Loss | (854) | (1,224) | (43)
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Fair Value | 1,344,598 | 1,361,628 | 1,395,597
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss | (133,118) | (137,618) | (115,473)
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair value,Total | 1,365,876 | 1,418,405 | 1,402,496
Available-for-sale securities, continuous unrealized loss position, Unrealized Loss | (133,972) | (138,842) | (115,516)
Residential Mortgage-Backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Fair Value | 125,497 | 198,385 | 124,439
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Unrealized Loss | (450) | (4,990) | (335)
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Fair Value | 2,042,826 | 2,048,727 | 2,205,425
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss | (271,575) | (373,756) | (289,695)
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair value,Total | 2,168,323 | 2,247,112 | 2,329,864
Available-for-sale securities, continuous unrealized loss position, Unrealized Loss | (272,025) | (378,746) | (290,030)
Commercial Mortgage-Backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Fair Value | 66,851 | 196,640 | 7,118
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Unrealized Loss | (74) | (2,249) | (32)
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Fair Value | 166,330 | 190,189 | 209,632
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss | (3,344) | (7,409) | (5,763)
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair value,Total | 233,181 | 386,829 | 216,750
Available-for-sale securities, continuous unrealized loss position, Unrealized Loss | (3,418) | (9,658) | (5,795)
Corporate Bonds and Other [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Fair Value | 0 | 4,871 | 0
Available-for-sale securities, continuous unrealized loss position Less than 12 Months, Unrealized Loss | 0 | (44) | 0
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Fair Value | 82,982 | 95,840 | 97,183
Available-for-sale securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss | (3,618) | (6,334) | (5,186)
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair value,Total | 82,982 | 100,711 | 97,183
Available-for-sale securities, continuous unrealized loss position, Unrealized Loss | $ (3,618) | $ (6,378) | $ (5,186)

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