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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) | Mar. 31, 2024 | Dec. 31, 2023
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Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | $ 1,032,037,000 | $ 1,103,170,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 1,032,037,000 | 1,103,170,000
Gross Unrealized Gains | 345,000 | 202,000
Gross Unrealized Losses | (59,754,000) | (56,933,000)
Fair Value | 972,628,000 | 1,046,439,000
Debt securities, held to maturity, accrued interest | 2,600,000 | 2,700,000
Asset-backed securities |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 509,690,000 | 575,990,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 509,690,000 | 575,990,000
Gross Unrealized Gains | 345,000 | 202,000
Gross Unrealized Losses | (2,432,000) | (2,064,000)
Fair Value | 507,603,000 | 574,128,000
Agency-guaranteed residential mortgage-backed securities |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 7,001,000 | 7,039,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 7,001,000 | 7,039,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,087,000) | (649,000)
Fair Value | 5,914,000 | 6,390,000
Agency-guaranteed commercial mortgage-backed securities |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 1,830,000 | 1,850,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 1,830,000 | 1,850,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (151,000) | (134,000)
Fair Value | 1,679,000 | 1,716,000
Agency-guaranteed residential collateralized mortgage obligations |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 182,856,000 | 186,636,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 182,856,000 | 186,636,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (20,723,000) | (19,049,000)
Fair Value | 162,133,000 | 167,587,000
Agency-guaranteed commercial collateralized mortgage obligations |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 146,001,000 | 146,765,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 146,001,000 | 146,765,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (21,535,000) | (23,178,000)
Fair Value | 124,466,000 | 123,587,000
Private label collateralized mortgage obligations |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 184,659,000 | 184,890,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 184,659,000 | 184,890,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (13,826,000) | (11,859,000)
Fair Value | $ 170,833,000 | $ 173,031,000

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