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Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | $ 2,498,118 | $ 2,024,753
Less than 12 Months, Unrealized Losses | (119,018) | (15,567)
12 Months or More, Fair Value | 42,477 | 6,818
12 Months or More, Unrealized Losses | (2,163) | (136)
Fair Value, Total | 2,540,595 | 2,031,571
Unrealized Losses | (121,181) | (15,703)
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 132,895 | 54,753
Less than 12 Months, Unrealized Losses | (2,495) | (119)
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
Fair Value, Total | 132,895 | 54,753
Unrealized Losses | (2,495) | (119)
Agency-guaranteed residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value |  | 9,554
Less than 12 Months, Unrealized Losses |  | (312)
12 Months or More, Fair Value |  | 0
12 Months or More, Unrealized Losses |  | 0
Fair Value, Total |  | 9,554
Unrealized Losses |  | (312)
Agency-guaranteed commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value |  | 2,152
Less than 12 Months, Unrealized Losses |  | (10)
12 Months or More, Fair Value |  | 0
12 Months or More, Unrealized Losses |  | 0
Fair Value, Total |  | 2,152
Unrealized Losses |  | (10)
Agency-guaranteed residential collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 147,120 | 173,492
Less than 12 Months, Unrealized Losses | (9,219) | (2,315)
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
Fair Value, Total | 147,120 | 173,492
Unrealized Losses | (9,219) | (2,315)
Agency-guaranteed commercial collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value |  | 118,334
Less than 12 Months, Unrealized Losses |  | (3,877)
12 Months or More, Fair Value |  | 0
12 Months or More, Unrealized Losses |  | 0
Fair Value, Total |  | 118,334
Unrealized Losses |  | (3,877)
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 920,688 | 715,250
Less than 12 Months, Unrealized Losses | (23,080) | (1,215)
12 Months or More, Fair Value | 25,064 | 0
12 Months or More, Unrealized Losses | (565) | 0
Fair Value, Total | 945,752 | 715,250
Unrealized Losses | (23,645) | (1,215)
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 117,536 | 122,597
Less than 12 Months, Unrealized Losses | (3,188) | (180)
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
Fair Value, Total | 117,536 | 122,597
Unrealized Losses | (3,188) | (180)
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 434,262 | 188,100
Less than 12 Months, Unrealized Losses | (32,270) | (1,561)
12 Months or More, Fair Value | 13,413 | 0
12 Months or More, Unrealized Losses | (1,586) | 0
Fair Value, Total | 447,675 | 188,100
Unrealized Losses | (33,856) | (1,561)
Private label collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 737,880 | 632,091
Less than 12 Months, Unrealized Losses | (47,976) | (5,874)
12 Months or More, Fair Value | 4,000 | 6,818
12 Months or More, Unrealized Losses | (12) | (136)
Fair Value, Total | 741,880 | 638,909
Unrealized Losses | (47,988) | (6,010)
State and political subdivision debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 7,737 | 8,430
Less than 12 Months, Unrealized Losses | (790) | (104)
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
Fair Value, Total | 7,737 | 8,430
Unrealized Losses | $ (790) | $ (104)

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