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Investment Securities - Gross Unrealized Losses on Debt Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities Available for Sale |  |
Less than 12 months, fair value | $ 107,517 | $ 66,657
Less than 12 months, unrealized loss | (165) | (751)
12 months or more, fair value | 1,667,772 | 1,997,383
12 months or more, unrealized loss | (181,372) | (231,595)
Total, fair value | 1,775,289 | 2,064,040
Total, unrealized loss | (181,537) | (232,346)
Debt Securities Held to Maturity |  |
Less than 12 months, fair value | 506 | 0
Less than 12 months, unrealized loss | (3) | 0
12 months or more, fair value | 110,173 | 123,271
12 months or more, unrealized loss | (5,279) | (8,374)
Total, fair value | 110,679 | 123,271
Total, unrealized loss | (5,282) | (8,374)
Obligations of U.S. government agencies |  |
Debt Securities Available for Sale |  |
Less than 12 months, fair value | 7 | 224
Less than 12 months, unrealized loss | (1) | 0
12 months or more, fair value | 1,092,624 | 1,221,320
12 months or more, unrealized loss | (132,116) | (165,037)
Total, fair value | 1,092,631 | 1,221,544
Total, unrealized loss | (132,117) | (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 | 109,144 | 122,259
12 months or more, unrealized loss | (5,253) | (8,331)
Total, fair value | 109,144 | 122,259
Total, unrealized loss | (5,253) | (8,331)
Obligations of states and political subdivisions |  |
Debt Securities Available for Sale |  |
Less than 12 months, fair value | 0 | 6,229
Less than 12 months, unrealized loss | 0 | (75)
12 months or more, fair value | 216,428 | 216,497
12 months or more, unrealized loss | (20,526) | (26,697)
Total, fair value | 216,428 | 222,726
Total, unrealized loss | (20,526) | (26,772)
Debt Securities Held to Maturity |  |
Less than 12 months, fair value | 506 | 0
Less than 12 months, unrealized loss | (3) | 0
12 months or more, fair value | 1,029 | 1,012
12 months or more, unrealized loss | (26) | (43)
Total, fair value | 1,535 | 1,012
Total, unrealized loss | (29) | (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 | 4,598 | 5,602
12 months or more, unrealized loss | (335) | (571)
Total, fair value | 4,598 | 5,602
Total, unrealized loss | (335) | (571)
Asset backed securities |  |
Debt Securities Available for Sale |  |
Less than 12 months, fair value | 107,510 | 15,928
Less than 12 months, unrealized loss | (164) | (93)
12 months or more, fair value | 109,099 | 264,731
12 months or more, unrealized loss | (1,349) | (4,095)
Total, fair value | 216,609 | 280,659
Total, unrealized loss | (1,513) | (4,188)
Non-agency collateralized mortgage obligations |  |
Debt Securities Available for Sale |  |
Less than 12 months, fair value | 0 | 44,276
Less than 12 months, unrealized loss | 0 | (583)
12 months or more, fair value | 245,023 | 289,233
12 months or more, unrealized loss | (27,046) | (35,195)
Total, fair value | 245,023 | 333,509
Total, unrealized loss | $ (27,046) | $ (35,778)

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