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v3.23.2

Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | $ 1,258,560,000 | $ 840,259,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 1,258,560,000 | 840,259,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (46,312,000) | (46,446,000)
Fair Value | 1,212,248,000 | 793,813,000
Debt securities, held to maturity, accrued interest | 1,400,000 | 1,000,000
Asset-backed securities |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 719,551,000 | 361,107,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 719,551,000 | 361,107,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (5,117,000) | (4,974,000)
Fair Value | 714,434,000 | 356,133,000
Agency-guaranteed residential mortgage-backed securities |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 7,115,000 | 7,189,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 7,115,000 | 7,189,000
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (669,000) | (563,000)
Fair Value | 6,446,000 | 6,626,000
Agency-guaranteed commercial mortgage-backed securities |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 1,889,000 | 1,928,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 1,889,000 | 1,928,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (103,000) | (104,000)
Fair Value | 1,786,000 | 1,824,000
Agency-guaranteed residential collateralized mortgage obligations |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 196,206,000 | 204,495,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 196,206,000 | 204,495,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (16,504,000) | (18,376,000)
Fair Value | 179,702,000 | 186,119,000
Agency-guaranteed commercial collateralized mortgage obligations |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 148,066,000 | 151,711,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 148,066,000 | 151,711,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (9,239,000) | (9,435,000)
Fair Value | 138,827,000 | 142,276,000
Private label collateralized mortgage obligations |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 185,733,000 | 113,829,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 185,733,000 | 113,829,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (14,680,000) | (12,994,000)
Fair Value | $ 171,053,000 | $ 100,835,000

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