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Investment Securities - Gross Unrealized Losses on Debt Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | $ 145,286 | $ 66,657
Less than 12 months, Unrealized Loss | (1,028) | (751)
12 months or more, Fair Value | 1,803,056 | 1,997,383
12 months or more, Unrealized Loss | (247,448) | (231,595)
Total, Fair Value | 1,948,342 | 2,064,040
Total, Unrealized Loss | (248,476) | (232,346)
Debt Securities Held to Maturity |  |
Less than 12 months, Fair Value | 1,618 | 0
Less than 12 Months, Unrealized Loss | (8) | 0
12 months or more, Fair Value | 116,678 | 123,271
12 months or more, Unrealized Loss | (9,276) | (8,374)
Total, Fair Value | 118,296 | 123,271
Total, Unrealized Loss | (9,284) | (8,374)
Obligations of U.S. government agencies |  |
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | 442 | 224
Less than 12 months, Unrealized Loss | (3) | 0
12 months or more, Fair Value | 1,169,687 | 1,221,320
12 months or more, Unrealized Loss | (179,485) | (165,037)
Total, Fair Value | 1,170,129 | 1,221,544
Total, Unrealized Loss | (179,488) | (165,037)
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 | 115,660 | 122,259
12 months or more, Unrealized Loss | (9,239) | (8,331)
Total, Fair Value | 115,660 | 122,259
Total, Unrealized Loss | (9,239) | (8,331)
Obligations of states and political subdivisions |  |
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | 6,760 | 6,229
Less than 12 months, Unrealized Loss | (152) | (75)
12 months or more, Fair Value | 219,908 | 216,497
12 months or more, Unrealized Loss | (28,580) | (26,697)
Total, Fair Value | 226,668 | 222,726
Total, Unrealized Loss | (28,732) | (26,772)
Debt Securities Held to Maturity |  |
Less than 12 months, Fair Value | 1,618 | 0
Less than 12 Months, Unrealized Loss | (8) | 0
12 months or more, Fair Value | 1,018 | 1,012
12 months or more, Unrealized Loss | (37) | (43)
Total, Fair Value | 2,636 | 1,012
Total, Unrealized Loss | (45) | (43)
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 | 5,746 | 5,602
12 months or more, Unrealized Loss | (429) | (571)
Total, Fair Value | 5,746 | 5,602
Total, Unrealized Loss | (429) | (571)
Asset backed securities |  |
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | 94,861 | 15,928
Less than 12 months, Unrealized Loss | (350) | (93)
12 months or more, Fair Value | 146,838 | 264,731
12 months or more, Unrealized Loss | (3,477) | (4,095)
Total, Fair Value | 241,699 | 280,659
Total, Unrealized Loss | (3,827) | (4,188)
Non-agency collateralized mortgage obligations |  |
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | 43,223 | 44,276
Less than 12 months, Unrealized Loss | (523) | (583)
12 months or more, Fair Value | 260,877 | 289,233
12 months or more, Unrealized Loss | (35,477) | (35,195)
Total, Fair Value | 304,100 | 333,509
Total, Unrealized Loss | $ (36,000) | $ (35,778)

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