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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,429,715 | $ 1,174,188
Gross Unrealized Gains | 11,028 | 32,890
Gross Unrealized Losses | (3,666) | (647)
Fair Value | 1,437,077 | 1,206,431
Equity securities | 4,827 | 3,854
Investment securities, at fair value | 1,441,904 | 1,210,285
Available-for-sale debt securities, accrued interest | 4,300 | 4,200
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 381,525 | 372,640
Gross Unrealized Gains | 5,717 | 4,515
Gross Unrealized Losses | (249) | (10)
Fair Value | 386,993 | 377,145
U.S. government agencies securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 20,000 | 20,000
Gross Unrealized Gains | 53 | 34
Gross Unrealized Losses | 0 | 0
Fair Value | 20,053 | 20,034
Agency-guaranteed residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 37,933 | 61,178
Gross Unrealized Gains | 9 | 1,913
Gross Unrealized Losses | (308) | 0
Fair Value | 37,634 | 63,091
Agency-guaranteed collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 211,226 | 160,950
Gross Unrealized Gains | 365 | 916
Gross Unrealized Losses | (487) | (99)
Fair Value | 211,104 | 161,767
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 162,998 | 32,367
Gross Unrealized Gains | 139 | 0
Gross Unrealized Losses | (43) | 0
Fair Value | 163,094 | 32,367
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 13,059 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fair Value | 13,059 |
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 255,126 | 372,764
Gross Unrealized Gains | 3,422 | 24,144
Gross Unrealized Losses | (624) | (164)
Fair Value | 257,924 | 396,744
Private label collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 329,367 | 136,943
Gross Unrealized Gains | 1,277 | 423
Gross Unrealized Losses | (1,955) | (374)
Fair Value | 328,689 | 136,992
State and political subdivision debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 18,481 | 17,346
Gross Unrealized Gains | 46 | 945
Gross Unrealized Losses | 0 | 0
Fair Value | $ 18,527 | $ 18,291

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