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Investment Securities - Gross Unrealized Losses on Debt Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | $ 341,589 | $ 1,185,676
Less than 12 months, Unrealized Loss | (13,825) | (97,101)
12 months or more, Fair Value | 1,945,453 | 1,218,843
12 months or more, Unrealized Loss | (259,360) | (193,869)
Total, Fair Value | 2,287,042 | 2,404,519
Total, Unrealized Loss | (273,185) | (290,970)
Debt Securities Held to Maturity |  |
Less than 12 months, Fair Value | 40,032 | 148,107
Less than 12 Months, Unrealized Loss | (2,552) | (11,060)
12 months or more, Fair Value | 93,289 | 0
12 months or more, Unrealized Loss | (8,158) | 0
Total, Fair Value | 133,321 | 148,107
Total, Unrealized Loss | (10,710) | (11,060)
Obligations of U.S. government agencies |  |
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | 148,377 | 605,615
Less than 12 months, Unrealized Loss | (9,454) | (61,408)
12 months or more, Fair Value | 1,160,872 | 766,612
12 months or more, Unrealized Loss | (178,518) | (134,234)
Total, Fair Value | 1,309,249 | 1,372,227
Total, Unrealized Loss | (187,972) | (195,642)
Debt Securities Held to Maturity |  |
Less than 12 months, Fair Value | 39,059 | 143,577
Less than 12 Months, Unrealized Loss | (2,530) | (11,013)
12 months or more, Fair Value | 92,743 | 0
12 months or more, Unrealized Loss | (8,134) | 0
Total, Fair Value | 131,802 | 143,577
Total, Unrealized Loss | (10,664) | (11,013)
Obligations of states and political subdivisions |  |
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | 42,997 | 219,532
Less than 12 months, Unrealized Loss | (958) | (26,904)
12 months or more, Fair Value | 204,574 | 43,282
12 months or more, Unrealized Loss | (31,729) | (12,917)
Total, Fair Value | 247,571 | 262,814
Total, Unrealized Loss | (32,687) | (39,821)
Debt Securities Held to Maturity |  |
Less than 12 months, Fair Value | 973 | 4,530
Less than 12 Months, Unrealized Loss | (22) | (47)
12 months or more, Fair Value | 546 | 0
12 months or more, Unrealized Loss | (24) | 0
Total, Fair Value | 1,519 | 4,530
Total, Unrealized Loss | (46) | (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 | 5,501 | 0
12 months or more, Unrealized Loss | (667) | 0
Total, Fair Value | 5,501 | 5,751
Total, Unrealized Loss | (667) | (413)
Asset backed securities |  |
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | 88,449 | 231,703
Less than 12 months, Unrealized Loss | (1,240) | (4,955)
12 months or more, Fair Value | 359,902 | 205,329
12 months or more, Unrealized Loss | (9,670) | (10,238)
Total, Fair Value | 448,351 | 437,032
Total, Unrealized Loss | (10,910) | (15,193)
Non-agency collateralized mortgage obligations |  |
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | 61,766 | 123,075
Less than 12 months, Unrealized Loss | (2,173) | (3,421)
12 months or more, Fair Value | 214,604 | 203,620
12 months or more, Unrealized Loss | (38,776) | (36,480)
Total, Fair Value | 276,370 | 326,695
Total, Unrealized Loss | $ (40,949) | $ (39,901)

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