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Investment securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt securities available for sale: |  |
Due in one year or less | $ 2,895,000 |
Due after one year through five years | 4,912,000 |
Due after five years through ten years | 0 |
Due after ten years | 0 |
Total available for sale (amortized cost) | 7,807,000 |
Mortgage-backed securities | 13,651,000 |
Investment securities available for sale, amortized cost | 21,458,000 | $ 19,054,000
Debt securities held to maturity: |  |
Due in one year or less | 82,000 |
Due after one year through five years | 641,000 |
Due after five years through ten years | 1,399,000 |
Due after ten years | 548,000 |
Total available for held to maturity (amortized cost) | 2,670,000 |
Mortgage-backed securities | 10,354,000 |
Amortized cost for held to maturity | 13,024,000 | 14,195,000
Debt securities available for sale: |  |
Due in one year or less | 2,900,000 |
Due after one year through five years | 4,940,000 |
Due after five years through ten years | 0 |
Due after ten years | 0 |
Total available for sale (fair value) | 7,840,000 |
Mortgage-backed securities | 13,700,000 |
Investment securities available for sale, estimated fair value | 21,540,000 | 18,849,000
Debt securities held to maturity: |  |
Due in one year or less | 82,000 |
Due after one year through five years | 631,000 |
Due after five years through ten years | 1,360,000 |
Due after ten years | 487,000 |
Total available for held to maturity (fair value) | 2,560,000 |
Mortgage-backed securities | 9,513,000 |
Estimated fair value for held to maturity | $ 12,073,000 | $ 12,955,000

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