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v3.23.3

Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | $ 1,178,370,000 | $ 840,259,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 1,178,370,000 | 840,259,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (62,794,000) | (46,446,000)
Fair Value | 1,115,576,000 | 793,813,000
Debt securities, held to maturity, accrued interest | 2,700,000 | 1,000,000
Asset-backed securities |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 645,362,000 | 361,107,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 645,362,000 | 361,107,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (5,174,000) | (4,974,000)
Fair Value | 640,188,000 | 356,133,000
Agency-guaranteed residential mortgage-backed securities |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 7,077,000 | 7,189,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 7,077,000 | 7,189,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,027,000) | (563,000)
Fair Value | 6,050,000 | 6,626,000
Agency-guaranteed commercial mortgage-backed securities |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 1,870,000 | 1,928,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 1,870,000 | 1,928,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (139,000) | (104,000)
Fair Value | 1,731,000 | 1,824,000
Agency-guaranteed residential collateralized mortgage obligations |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 191,469,000 | 204,495,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 191,469,000 | 204,495,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (23,331,000) | (18,376,000)
Fair Value | 168,138,000 | 186,119,000
Agency-guaranteed commercial collateralized mortgage obligations |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 147,414,000 | 151,711,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 147,414,000 | 151,711,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (15,848,000) | (9,435,000)
Fair Value | 131,566,000 | 142,276,000
Private label collateralized mortgage obligations |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 185,178,000 | 113,829,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 185,178,000 | 113,829,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (17,275,000) | (12,994,000)
Fair Value | $ 167,903,000 | $ 100,835,000

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