Regulatory Capital and Liquidity Requirements - Summary of Applicable Capital and Liquidity Amounts and Requirements by Agencies (Detail) $ in Thousands |
Jun. 30, 2025
USD ($)
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Dec. 31, 2024
USD ($)
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|---|---|---|---|---|
| Capital Requirements By Agencies [Line Items] | ||||
| Net worth, Actual | [1] | $ 800,725 | $ 876,324 | |
| Net worth, Required | [1] | $ 574,596 | $ 579,383 | |
| Tangible net worth / total assets ratio, Actual | [1] | 0.11 | 0.12 | |
| Tangible net worth / total assets ratio, Required | [1] | 0.06 | 0.06 | |
| Liquidity, Actual | [1] | $ 587,998 | $ 564,311 | |
| Liquidity, Required | [1] | $ 214,041 | $ 215,801 | |
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