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INVESTMENT SECURITIES - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) | Sep. 30, 2024 | Dec. 31, 2023
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Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | $ 1,064,437,000 | $ 1,103,170,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 1,064,437,000 | 1,103,170,000
Gross Unrealized Gains | 2,417,000 | 202,000
Gross Unrealized Losses | (39,340,000) | (56,933,000)
Fair Value | 1,027,514,000 | 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 | 538,832,000 | 575,990,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 538,832,000 | 575,990,000
Gross Unrealized Gains | 1,628,000 | 202,000
Gross Unrealized Losses | (184,000) | (2,064,000)
Fair Value | 540,276,000 | 574,128,000
Agency-guaranteed residential mortgage-backed securities |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 6,920,000 | 7,039,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 6,920,000 | 7,039,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (522,000) | (649,000)
Fair Value | 6,398,000 | 6,390,000
Agency-guaranteed commercial mortgage-backed securities |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 1,790,000 | 1,850,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 1,790,000 | 1,850,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (271,000) | (134,000)
Fair Value | 1,519,000 | 1,716,000
Agency-guaranteed residential collateralized mortgage obligations |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 174,098,000 | 186,636,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 174,098,000 | 186,636,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (11,221,000) | (19,049,000)
Fair Value | 162,877,000 | 167,587,000
Agency-guaranteed commercial collateralized mortgage obligations |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 159,050,000 | 146,765,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 159,050,000 | 146,765,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (19,426,000) | (23,178,000)
Fair Value | 139,624,000 | 123,587,000
Private label collateralized mortgage obligations |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 183,747,000 | 184,890,000
Allowance for Credit Losses | 0 | 0
Net Carrying Value | 183,747,000 | 184,890,000
Gross Unrealized Gains | 789,000 | 0
Gross Unrealized Losses | (7,716,000) | (11,859,000)
Fair Value | $ 176,820,000 | $ 173,031,000

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