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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Held-to-maturity securities |  |
Amortized cost | $ 4,400 | $ 4,400
Estimated fair value | 4,400 | 4,400
Carrying value | 4,400 | 4,400
Available-for-sale securities |  |
Amortized cost | 5,397,669 | 5,472,310
Gross unrealized gains | 25,197 | 9,189
Gross unrealized losses | (413,023) | (493,583)
Estimated fair value, Available for sale securities | 5,009,843 | 4,987,916
Estimated Fair Value |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities | 5,009,843 | 4,987,916
Reported Value Measurement |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities | 5,009,843 | 4,987,916
Residential mortgage-backed securities |  |
Available-for-sale securities |  |
Amortized cost | 5,245,239 | 5,315,488
Gross unrealized gains | 25,192 | 8,858
Gross unrealized losses | (401,353) | (489,170)
Residential mortgage-backed securities | Estimated Fair Value |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities | 4,869,078 | 4,835,176
Residential mortgage-backed securities | Reported Value Measurement |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities | 4,869,078 | 4,835,176
Mortgage-backed securities |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities | 921,929 | 1,001,184
Fannie Mae and Freddie Mac |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities | 3,947,149 | 3,833,992
States and political subdivisions |  |
Available-for-sale securities |  |
Amortized cost | 152,430 | 156,822
Gross unrealized gains | 5 | 331
Gross unrealized losses | (11,670) | (4,413)
States and political subdivisions | Estimated Fair Value |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities | 140,765 | 152,740
States and political subdivisions | Reported Value Measurement |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities | 140,765 | 152,740
Other Debt Obligations |  |
Held-to-maturity securities |  |
Amortized cost | 4,400 | 4,400
Estimated fair value | 4,400 | 4,400
Carrying value | $ 4,400 | $ 4,400

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