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Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | $ 3,055,315 | $ 2,024,753
Less than 12 Months, Unrealized Losses | (73,883) | (15,567)
12 Months or More, Fair Value | 156,695 | 6,818
12 Months or More, Unrealized Losses | (12,630) | (136)
Fair Value, Total | 3,212,010 | 2,031,571
Unrealized Losses | (86,513) | (15,703)
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 199,725 | 54,753
Less than 12 Months, Unrealized Losses | (3,832) | (119)
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
Fair Value, Total | 199,725 | 54,753
Unrealized Losses | (3,832) | (119)
Agency-guaranteed residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 0 | 9,554
Less than 12 Months, Unrealized Losses | 0 | (312)
12 Months or More, Fair Value | 8,269 | 0
12 Months or More, Unrealized Losses | (973) | 0
Fair Value, Total | 8,269 | 9,554
Unrealized Losses | (973) | (312)
Agency-guaranteed commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 2,045 | 2,152
Less than 12 Months, Unrealized Losses | (95) | (10)
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
Fair Value, Total | 2,045 | 2,152
Unrealized Losses | (95) | (10)
Agency-guaranteed residential collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 434,524 | 173,492
Less than 12 Months, Unrealized Losses | (16,428) | (2,315)
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
Fair Value, Total | 434,524 | 173,492
Unrealized Losses | (16,428) | (2,315)
Agency-guaranteed commercial collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 95,995 | 118,334
Less than 12 Months, Unrealized Losses | (3,764) | (3,877)
12 Months or More, Fair Value | 66,605 | 0
12 Months or More, Unrealized Losses | (6,047) | 0
Fair Value, Total | 162,600 | 118,334
Unrealized Losses | (9,811) | (3,877)
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 934,954 | 715,250
Less than 12 Months, Unrealized Losses | (6,457) | (1,215)
12 Months or More, Fair Value | 25,510 | 0
12 Months or More, Unrealized Losses | (119) | 0
Fair Value, Total | 960,464 | 715,250
Unrealized Losses | (6,576) | (1,215)
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 129,365 | 122,597
Less than 12 Months, Unrealized Losses | (1,368) | (180)
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
Fair Value, Total | 129,365 | 122,597
Unrealized Losses | (1,368) | (180)
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 393,997 | 188,100
Less than 12 Months, Unrealized Losses | (13,972) | (1,561)
12 Months or More, Fair Value | 14,115 | 0
12 Months or More, Unrealized Losses | (884) | 0
Fair Value, Total | 408,112 | 188,100
Unrealized Losses | (14,856) | (1,561)
Private label collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 856,760 | 632,091
Less than 12 Months, Unrealized Losses | (27,386) | (5,874)
12 Months or More, Fair Value | 42,196 | 6,818
12 Months or More, Unrealized Losses | (4,607) | (136)
Fair Value, Total | 898,956 | 638,909
Unrealized Losses | (31,993) | (6,010)
State and political subdivision debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 7,950 | 8,430
Less than 12 Months, Unrealized Losses | (581) | (104)
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
Fair Value, Total | 7,950 | 8,430
Unrealized Losses | $ (581) | $ (104)

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