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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments - Contractual Maturities and Estimated Fair Values (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Amortized Cost |  |  |  |  |
Due in one year or less, held-to-maturity debt securities amortized cost | $ 3,075,000 |  | $ 3,075,000 |  |
Due after one year through five years, held-to-maturity debt securities amortized cost | 1,325,000 |  | 1,325,000 |  |
Amortized cost, held-to-maturity debt securities | 4,400,000 |  | 4,400,000 |  | $ 4,400,000
Fair Value |  |  |  |  |
Due in one year or less, held-to-maturity debt securities, Estimated fair value | 3,075,000 |  | 3,075,000 |  |
Due after one year through five years, held-to-maturity debt securities, Estimated fair value | 1,325,000 |  | 1,325,000 |  |
Estimated fair value | 4,400,000 |  | 4,400,000 |  | 4,400,000
Available-for-sale debt securities amortized cost disclosures |  |  |  |  |
Due after five years through ten years, available-for-sale debt securities amortized cost | 2,240,000 |  | 2,240,000 |  |
Due after ten years, available-for-sale debt securities amortized cost | 138,881,000 |  | 138,881,000 |  |
Residential mortgage-backed securities, available-for-sale debt securities amortized cost | 5,175,459,000 |  | 5,175,459,000 |  |
Amortized cost, Available-for-sale securities | 5,316,580,000 |  | 5,316,580,000 |  | 5,472,310,000
Available for sale debt securities, Estimated Fair Value Disclosures |  |  |  |  |
Due after five years through ten years, available-for-sale debt securities, Estimated Fair Value | 2,240,000 |  | 2,240,000 |  |
Due after ten years, available-for-sale debt securities, Estimated Fair Value | 132,578,000 |  | 132,578,000 |  |
Residential mortgage-backed securities, available-for-sale debt securities, Estimated Fair Value | 4,845,524,000 |  | 4,845,524,000 |  |
Estimated fair value, Available for sale securities | 4,980,342,000 |  | 4,980,342,000 |  | $ 4,987,916,000
Available for sale debt securities, Estimated Fair Value Disclosures |  |  |  |  |
Proceeds from sales and calls of available for sale securities | 11,255,000 | $ 2,030,000 | 15,490,000 | $ 3,750,000 |
Proceeds from sales of mortgage-backed securities | 0 | 0 | 0 | 0 |
Allowance for credit losses | 0 |  | 0 |  |
Gross gains realized on sales | 0 | 0 | 0 | 0 |
Gross losses realized on sales | 1 | $ 1 | 1 | $ 1 |
Collateral pledged |  |  |  |  |
Available-for-sale debt securities amortized cost disclosures |  |  |  |  |
Amortized cost, Available-for-sale securities | 1,729,904,000 |  | 1,729,904,000 |  |
Available for sale debt securities, Estimated Fair Value Disclosures |  |  |  |  |
Fair value of available for sale investment securities pledged | $ 1,557,621,000 |  | $ 1,557,621,000 |  |

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