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Investment securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt securities available for sale: |  |
Due in one year or less | $ 2,634,000 |
Due after one year through five years | 3,949,000 |
Due after five years through ten years | 0 |
Due after ten years | 0 |
Total available for sale (amortized cost) | 6,583,000 |
Mortgage-backed securities | 16,417,000 |
Investment securities available for sale, amortized cost | 23,000,000 | $ 19,054,000
Debt securities held to maturity: |  |
Due in one year or less | 71,000 |
Due after one year through five years | 679,000 |
Due after five years through ten years | 1,355,000 |
Due after ten years | 505,000 |
Total available for held to maturity (amortized cost) | 2,610,000 |
Mortgage-backed securities | 10,101,000 |
Amortized cost for held to maturity | 12,711,000 | 14,195,000
Debt securities available for sale: |  |
Due in one year or less | 2,639,000 |
Due after one year through five years | 3,983,000 |
Due after five years through ten years | 0 |
Due after ten years | 0 |
Total available for sale (fair value) | 6,622,000 |
Mortgage-backed securities | 16,541,000 |
Investment securities available for sale, estimated fair value | 23,163,000 | 18,849,000
Debt securities held to maturity: |  |
Due in one year or less | 71,000 |
Due after one year through five years | 672,000 |
Due after five years through ten years | 1,336,000 |
Due after ten years | 464,000 |
Total available for held to maturity (fair value) | 2,543,000 |
Mortgage-backed securities | 9,381,000 |
Estimated fair value for held to maturity | $ 11,924,000 | $ 12,955,000

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