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Investment Securities - Gross Unrealized Losses on Investment Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | $ 66,657 | $ 1,218,843
Less than 12 months, Unrealized Loss | (751) | (193,869)
12 months or more, Fair Value | 1,997,383 | 1,185,676
12 months or more, Unrealized Loss | (231,595) | (97,101)
Total, Fair Value | 2,064,040 | 2,404,519
Total, Unrealized Loss | (232,346) | (290,970)
Debt Securities Held to Maturity |  |
Less than 12 months, Fair Value | 0 | 0
Less than 12 Months, Unrealized Loss | 0 | 0
12 months or more, Fair Value | 123,271 | 148,107
12 months or more, Unrealized Loss | (8,374) | (11,060)
Total, Fair Value | 123,271 | 148,107
Total, Unrealized Loss | (8,374) | (11,060)
Obligations of U.S. government agencies |  |
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | 224 | 766,612
Less than 12 months, Unrealized Loss | 0 | (134,234)
12 months or more, Fair Value | 1,221,320 | 605,615
12 months or more, Unrealized Loss | (165,037) | (61,408)
Total, Fair Value | 1,221,544 | 1,372,227
Total, Unrealized Loss | (165,037) | (195,642)
Debt Securities Held to Maturity |  |
Less than 12 months, Fair Value | 0 | 0
Less than 12 Months, Unrealized Loss | 0 | 0
12 months or more, Fair Value | 122,259 | 143,577
12 months or more, Unrealized Loss | (8,331) | (11,013)
Total, Fair Value | 122,259 | 143,577
Total, Unrealized Loss | (8,331) | (11,013)
Obligations of states and political subdivisions |  |
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | 6,229 | 43,282
Less than 12 months, Unrealized Loss | (75) | (12,917)
12 months or more, Fair Value | 216,497 | 219,532
12 months or more, Unrealized Loss | (26,697) | (26,904)
Total, Fair Value | 222,726 | 262,814
Total, Unrealized Loss | (26,772) | (39,821)
Debt Securities Held to Maturity |  |
Less than 12 months, Fair Value | 0 | 0
Less than 12 Months, Unrealized Loss | 0 | 0
12 months or more, Fair Value | 1,012 | 4,530
12 months or more, Unrealized Loss | (43) | (47)
Total, Fair Value | 1,012 | 4,530
Total, Unrealized Loss | (43) | (47)
Corporate bonds |  |
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | 0 | 0
Less than 12 months, Unrealized Loss | 0 | 0
12 months or more, Fair Value | 5,602 | 5,751
12 months or more, Unrealized Loss | (571) | (413)
Total, Fair Value | 5,602 | 5,751
Total, Unrealized Loss | (571) | (413)
Asset backed securities |  |
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | 15,928 | 205,329
Less than 12 months, Unrealized Loss | (93) | (10,238)
12 months or more, Fair Value | 264,731 | 231,703
12 months or more, Unrealized Loss | (4,095) | (4,955)
Total, Fair Value | 280,659 | 437,032
Total, Unrealized Loss | (4,188) | (15,193)
Non-agency collateralized mortgage obligations |  |
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | 44,276 | 203,620
Less than 12 months, Unrealized Loss | (583) | (36,480)
12 months or more, Fair Value | 289,233 | 123,075
12 months or more, Unrealized Loss | (35,195) | (3,421)
Total, Fair Value | 333,509 | 326,695
Total, Unrealized Loss | $ (35,778) | $ (39,901)

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