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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,520,523 | $ 1,174,188
Gross Unrealized Gains | 10,664 | 32,890
Gross Unrealized Losses | (4,395) | (647)
Fair Value | 1,526,792 | 1,206,431
Equity securities |  | 3,854
Investment securities, at fair value | 1,526,792 | 1,210,285
Available-for-sale debt securities, accrued interest | 5,000 | 4,200
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 319,682 | 372,640
Gross Unrealized Gains | 3,649 | 4,515
Gross Unrealized Losses | (377) | (10)
Fair Value | 322,954 | 377,145
U.S. government agencies securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 20,000 | 20,000
Gross Unrealized Gains | 114 | 34
Gross Unrealized Losses | 0 | 0
Fair Value | 20,114 | 20,034
Agency-guaranteed residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 10,620 | 61,178
Gross Unrealized Gains | 0 | 1,913
Gross Unrealized Losses | (265) | 0
Fair Value | 10,355 | 63,091
Agency-guaranteed commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,206 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (1) |
Fair Value | 2,205 |
Agency-guaranteed residential collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 81,007 | 139,985
Gross Unrealized Gains | 813 | 916
Gross Unrealized Losses | (62) | (60)
Fair Value | 81,758 | 140,841
Agency-guaranteed commercial collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 144,593 | 20,965
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,752) | (39)
Fair Value | 142,841 | 20,926
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 162,960 | 32,367
Gross Unrealized Gains | 148 | 0
Gross Unrealized Losses | (181) | 0
Fair Value | 162,927 | 32,367
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 23,054 |
Gross Unrealized Gains | 33 |
Gross Unrealized Losses | 0 |
Fair Value | 23,087 |
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 345,909 | 372,764
Gross Unrealized Gains | 4,974 | 24,144
Gross Unrealized Losses | (462) | (164)
Fair Value | 350,421 | 396,744
Private label collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 401,949 | 136,943
Gross Unrealized Gains | 922 | 423
Gross Unrealized Losses | (1,295) | (374)
Fair Value | 401,576 | 136,992
State and political subdivision debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 8,543 | 17,346
Gross Unrealized Gains | 11 | 945
Gross Unrealized Losses | 0 | 0
Fair Value | $ 8,554 | $ 18,291

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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