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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | $ 2,715,374 | $ 2,524,663 |  |
Allowance for Credit Losses | (5,069) | (3,952) | $ (2,173) | $ (578)
Gross Unrealized Gains | 1,055 | 1,296 |  |
Gross Unrealized Losses | (140,221) | (145,147) |  |
Fair Value | 2,571,139 | 2,376,860 |  |
Equity securities | 33,729 | 28,780 |  |
Total investment securities, at fair value | 2,604,868 | 2,405,640 |  |
Available-for-sale debt securities, accrued interest | 19,500 | 14,700 |  |
Asset-backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 62,274 | 97,359 |  |
Allowance for Credit Losses | (450) | (483) | (790) | (578)
Gross Unrealized Gains | 0 | 15 |  |
Gross Unrealized Losses | (3,590) | (4,262) |  |
Fair Value | 58,234 | 92,629 |  |
Agency-guaranteed residential mortgage-backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 86,227 |  |  |
Allowance for Credit Losses | 0 |  |  |
Gross Unrealized Gains | 299 |  |  |
Gross Unrealized Losses | (114) |  |  |
Fair Value | 86,412 |  |  |
Agency-guaranteed residential collateralized mortgage obligations |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 138,573 | 129,589 |  |
Allowance for Credit Losses | 0 | 0 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized Losses | (13,615) | (12,681) |  |
Fair Value | 124,958 | 116,908 |  |
Agency-guaranteed commercial collateralized mortgage obligations |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 34,573 |  |  |
Allowance for Credit Losses | 0 |  |  |
Gross Unrealized Gains | 73 |  |  |
Gross Unrealized Losses | (872) |  |  |
Fair Value | 33,774 |  |  |
Collateralized loan obligations |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 593,236 | 500,109 |  |
Allowance for Credit Losses | 0 | 0 |  |
Gross Unrealized Gains | 55 | 1 |  |
Gross Unrealized Losses | (8,796) | (11,018) |  |
Fair Value | 584,495 | 489,092 |  |
Commercial mortgage-backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 114,445 | 125,885 |  |
Allowance for Credit Losses | 0 | 0 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized Losses | (1,819) | (4,249) |  |
Fair Value | 112,626 | 121,636 |  |
Corporate notes |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 668,459 | 636,880 |  |
Allowance for Credit Losses | (4,619) | (3,469) | $ (1,383) | $ 0
Gross Unrealized Gains | 0 | 79 |  |
Gross Unrealized Losses | (53,370) | (50,456) |  |
Fair Value | 610,470 | 583,034 |  |
Private label collateralized mortgage obligations |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 1,017,587 | 1,034,841 |  |
Allowance for Credit Losses | 0 | 0 |  |
Gross Unrealized Gains | 628 | 1,201 |  |
Gross Unrealized Losses | (58,045) | (62,481) |  |
Fair Value | $ 960,170 | $ 973,561 |  |

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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