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Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | $ 2,024,753 | $ 135,579
Less Than 12 Months, Unrealized Losses | (15,567) | (647)
12 Months or More, Fair Value | 6,818 | 0
12 Months or More, Unrealized Losses | (136) | 0
Fair Value | 2,031,571 | 135,579
Unrealized Losses | (15,703) | (647)
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 54,753 | 42,588
Less Than 12 Months, Unrealized Losses | (119) | (10)
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
Fair Value | 54,753 | 42,588
Unrealized Losses | (119) | (10)
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 | 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 | 2,152 |
Unrealized Losses | (10) |
Agency-guaranteed residential collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 173,492 | 8,896
Less Than 12 Months, Unrealized Losses | (2,315) | (60)
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
Fair Value | 173,492 | 8,896
Unrealized Losses | (2,315) | (60)
Agency-guaranteed commercial collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 118,334 | 20,926
Less Than 12 Months, Unrealized Losses | (3,877) | (39)
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
Fair Value | 118,334 | 20,926
Unrealized Losses | (3,877) | (39)
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 715,250 |
Less Than 12 Months, Unrealized Losses | (1,215) |
12 Months or More, Fair Value | 0 |
12 Months or More, Unrealized Losses | 0 |
Fair Value | 715,250 |
Unrealized Losses | (1,215) |
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 122,597 |
Less Than 12 Months, Unrealized Losses | (180) |
12 Months or More, Fair Value | 0 |
12 Months or More, Unrealized Losses | 0 |
Fair Value | 122,597 |
Unrealized Losses | (180) |
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 188,100 | 50,620
Less Than 12 Months, Unrealized Losses | (1,561) | (164)
12 Months or More, Fair Value |  | 0
12 Months or More, Unrealized Losses |  | 0
Fair Value | 188,100 | 50,620
Unrealized Losses | (1,561) | (164)
Private label collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 632,091 | 12,549
Less Than 12 Months, Unrealized Losses | (5,874) | (374)
12 Months or More, Fair Value | 6,818 | 0
12 Months or More, Unrealized Losses | (136) | 0
Fair Value | 638,909 | 12,549
Unrealized Losses | (6,010) | $ (374)
State and political subdivision debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 8,430 |
Less Than 12 Months, Unrealized Losses | (104) |
12 Months or More, Fair Value | 0 |
12 Months or More, Unrealized Losses | 0 |
Fair Value | 8,430 |
Unrealized Losses | $ (104) |

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