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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Details) - USD ($) | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Held-to-maturity securities |  |
Amortized Value | $ 4,400,000 | $ 3,400,000
Estimated fair value | 4,400,000 | 3,400,000
Carrying Value | 4,400,000 | 3,400,000
Available-for-sale securities |  |
Amortized cost | 5,306,234,000 | 5,330,814,000
Gross unrealized gains | 4,437,000 | 11,143,000
Gross unrealized losses | (541,041,000) | (519,616,000)
Estimated fair value, Available for sale securities | 4,769,630,000 | 4,822,341,000
Collateral Pledged |  |
Available-for-sale securities |  |
Amortized cost | 1,821,695,000 |
Estimated Fair Value |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities | 4,769,630,000 | 4,822,341,000
Reported Value Measurement |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities | 4,769,630,000 | 4,822,341,000
Residential mortgage-backed securities |  |
Available-for-sale securities |  |
Amortized cost | 5,147,065,000 | 5,169,813,000
Gross unrealized gains | 3,720,000 | 9,541,000
Gross unrealized losses | (538,479,000) | (519,255,000)
Residential mortgage-backed securities | Estimated Fair Value |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities | 4,612,306,000 | 4,660,099,000
Residential mortgage-backed securities | Reported Value Measurement |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities | 4,612,306,000 | 4,660,099,000
US Government Corporations and Agencies Securities [Member] |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities | 945,465,000 | 959,421,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities | 3,666,841,000 | 3,700,678,000
States and political subdivisions |  |
Available-for-sale securities |  |
Amortized cost | 159,169,000 | 161,001,000
Gross unrealized gains | 717,000 | 1,602,000
Gross unrealized losses | (2,562,000) | (361,000)
States and political subdivisions | Estimated Fair Value |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities | 157,324,000 | 162,242,000
States and political subdivisions | Reported Value Measurement |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities | 157,324,000 | 162,242,000
Other Debt Obligations |  |
Held-to-maturity securities |  |
Amortized Value | 4,400,000 | 3,400,000
Estimated fair value | 4,400,000 | 3,400,000
Carrying Value | $ 4,400,000 | $ 3,400,000

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