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Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | $ 491,430 | $ 356,234
Less than 12 Months, Unrealized Losses | (10,535) | (12,782)
12 Months or More, Fair Value | 1,690,547 | 1,778,899
12 Months or More, Unrealized Losses | (112,720) | (116,764)
Total, Fair Value | 2,181,977 | 2,135,133
Total, Unrealized Losses | (123,255) | (129,546)
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 0 | 0
Less than 12 Months, Unrealized Losses | 0 | 0
12 Months or More, Fair Value | 52,676 | 64,029
12 Months or More, Unrealized Losses | (3,261) | (4,027)
Total, Fair Value | 52,676 | 64,029
Total, Unrealized Losses | (3,261) | (4,027)
Agency-guaranteed residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 47,014 |
Less than 12 Months, Unrealized Losses | (114) |
12 Months or More, Fair Value | 0 |
12 Months or More, Unrealized Losses | 0 |
Total, Fair Value | 47,014 |
Total, Unrealized Losses | (114) |
Agency-guaranteed residential collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 12,283 | 0
Less than 12 Months, Unrealized Losses | (105) | 0
12 Months or More, Fair Value | 112,675 | 116,908
12 Months or More, Unrealized Losses | (13,510) | (12,681)
Total, Fair Value | 124,958 | 116,908
Total, Unrealized Losses | (13,615) | (12,681)
Agency-guaranteed commercial collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 26,582 |
Less than 12 Months, Unrealized Losses | (872) |
12 Months or More, Fair Value | 0 |
12 Months or More, Unrealized Losses | 0 |
Total, Fair Value | 26,582 |
Total, Unrealized Losses | (872) |
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 114,173 | 29,241
Less than 12 Months, Unrealized Losses | (779) | (392)
12 Months or More, Fair Value | 429,799 | 438,551
12 Months or More, Unrealized Losses | (8,017) | (10,626)
Total, Fair Value | 543,972 | 467,792
Total, Unrealized Losses | (8,796) | (11,018)
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 0 | 0
Less than 12 Months, Unrealized Losses | 0 | 0
12 Months or More, Fair Value | 112,626 | 121,636
12 Months or More, Unrealized Losses | (1,819) | (4,249)
Total, Fair Value | 112,626 | 121,636
Total, Unrealized Losses | (1,819) | (4,249)
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 30,829 | 23,243
Less than 12 Months, Unrealized Losses | (532) | (1,147)
12 Months or More, Fair Value | 410,323 | 424,768
12 Months or More, Unrealized Losses | (36,201) | (33,764)
Total, Fair Value | 441,152 | 448,011
Total, Unrealized Losses | (36,733) | (34,911)
Private label collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 260,549 | 303,750
Less than 12 Months, Unrealized Losses | (8,133) | (11,243)
12 Months or More, Fair Value | 572,448 | 613,007
12 Months or More, Unrealized Losses | (49,912) | (51,417)
Total, Fair Value | 832,997 | 916,757
Total, Unrealized Losses | $ (58,045) | $ (62,660)

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