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Investment Securities - Gross Unrealized Losses on Debt Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | $ 91,604 | $ 1,185,676
Less than 12 months, Unrealized Loss | (3,924) | (97,101)
12 months or more, Fair Value | 2,017,453 | 1,218,843
12 months or more, Unrealized Loss | (331,777) | (193,869)
Total, Fair Value | 2,109,057 | 2,404,519
Total, Unrealized Loss | (335,701) | (290,970)
Debt Securities Held to Maturity |  |
Less than 12 months, Fair Value | 1,780 | 148,107
Less than 12 Months, Unrealized Loss | (61) | (11,060)
12 months or more, Fair Value | 122,278 | 0
12 months or more, Unrealized Loss | (14,939) | 0
Total, Fair Value | 124,058 | 148,107
Total, Unrealized Loss | (15,000) | (11,060)
Obligations of U.S. government agencies |  |
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | 413 | 605,615
Less than 12 months, Unrealized Loss | (14) | (61,408)
12 months or more, Fair Value | 1,206,736 | 766,612
12 months or more, Unrealized Loss | (235,852) | (134,234)
Total, Fair Value | 1,207,149 | 1,372,227
Total, Unrealized Loss | (235,866) | (195,642)
Debt Securities Held to Maturity |  |
Less than 12 months, Fair Value | 233 | 143,577
Less than 12 Months, Unrealized Loss | (2) | (11,013)
12 months or more, Fair Value | 121,340 | 0
12 months or more, Unrealized Loss | (14,822) | 0
Total, Fair Value | 121,573 | 143,577
Total, Unrealized Loss | (14,824) | (11,013)
Obligations of states and political subdivisions |  |
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | 46,600 | 219,532
Less than 12 months, Unrealized Loss | (2,674) | (26,904)
12 months or more, Fair Value | 207,415 | 43,282
12 months or more, Unrealized Loss | (45,972) | (12,917)
Total, Fair Value | 254,015 | 262,814
Total, Unrealized Loss | (48,646) | (39,821)
Debt Securities Held to Maturity |  |
Less than 12 months, Fair Value | 1,547 | 4,530
Less than 12 Months, Unrealized Loss | (59) | (47)
12 months or more, Fair Value | 938 | 0
12 months or more, Unrealized Loss | (117) | 0
Total, Fair Value | 2,485 | 4,530
Total, Unrealized Loss | (176) | (47)
Corporate bonds |  |
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | 0 | 5,751
Less than 12 months, Unrealized Loss | 0 | (413)
12 months or more, Fair Value | 5,505 | 0
12 months or more, Unrealized Loss | (665) | 0
Total, Fair Value | 5,505 | 5,751
Total, Unrealized Loss | (665) | (413)
Asset backed securities |  |
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | 0 | 231,703
Less than 12 months, Unrealized Loss | 0 | (4,955)
12 months or more, Fair Value | 309,126 | 205,329
12 months or more, Unrealized Loss | (5,730) | (10,238)
Total, Fair Value | 309,126 | 437,032
Total, Unrealized Loss | (5,730) | (15,193)
Non-agency collateralized mortgage obligations |  |
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | 44,591 | 123,075
Less than 12 months, Unrealized Loss | (1,236) | (3,421)
12 months or more, Fair Value | 288,671 | 203,620
12 months or more, Unrealized Loss | (43,558) | (36,480)
Total, Fair Value | 333,262 | 326,695
Total, Unrealized Loss | $ (44,794) | $ (39,901)

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