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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments - Other Investments (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
LIHTC |  |  |  |  |
Investments | $ 186,916,000 |  | $ 186,916,000 |  | $ 200,245,000
Investment, Proportional Amortization Method, Elected, Statement of Financial Position [Extensible Enumeration] | Other Long-Term Investments |  | Other Long-Term Investments |  | Other Long-Term Investments
Estimated tax credits | $ 5,633,000 |  | $ 16,899,000 |  |
Estimated amortization | 6,219,000 |  | 18,655,000 |  |
Impairment losses | 0 | $ 0 | 0 | $ 0 |
Other liabilities |  |  |  |  |
LIHTC |  |  |  |  |
Unfunded commitments | $ 22,741,000 |  | $ 22,741,000 |  | $ 34,126,000

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