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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,174,188 | $ 557,891
Gross Unrealized Gains | 32,890 | 19,307
Gross Unrealized Losses | (647) | 0
Fair Value | 1,206,431 | 577,198
Equity securities | 3,854 | 2,406
Total investment securities, at fair value | 1,210,285 | 595,876
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 372,640 |
Gross Unrealized Gains | 4,515 |
Gross Unrealized Losses | (10) |
Fair Value | 377,145 |
U.S. government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 20,000 |
Gross Unrealized Gains | 34 |
Gross Unrealized Losses | 0 |
Fair Value | 20,034 |
Agency-guaranteed mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 61,178 | 273,252
Gross Unrealized Gains | 1,913 | 5,069
Gross Unrealized Losses | 0 | 0
Fair Value | 63,091 | 278,321
Agency-guaranteed collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 160,950 |
Gross Unrealized Gains | 916 |
Gross Unrealized Losses | (99) |
Fair Value | 161,767 |
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 32,367 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fair Value | 32,367 |
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 372,764 | 284,639
Gross Unrealized Gains | 24,144 | 14,238
Gross Unrealized Losses | (164) | 0
Fair Value | 396,744 | 298,877
Private label collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 136,943 |
Gross Unrealized Gains | 423 |
Gross Unrealized Losses | (374) |
Fair Value | 136,992 |
State and political subdivision debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 17,346 |
Gross Unrealized Gains | 945 |
Gross Unrealized Losses | 0 |
Fair Value | $ 18,291 |
Interest-only GNMA securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Interest-only GNMA securities |  | $ 16,272

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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=121645371&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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