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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Details) - USD ($) | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Held-to-maturity securities |  |
Amortized Value | $ 3,400,000 | $ 3,400,000
Estimated fair value | 3,400,000 | 3,400,000
Carrying Value | 3,400,000 | 3,400,000
Available-for-sale securities |  |
Amortized cost | 5,388,257,000 | 5,018,996,000
Gross unrealized gains |  | 4,072,000
Gross unrealized losses | (696,319,000) | (605,272,000)
Estimated fair value, Available for sale securities | 4,691,938,000 | 4,417,796,000
Collateral Pledged |  |
Available-for-sale securities |  |
Amortized cost | 1,797,588,000 |
Estimated Fair Value |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities | 4,691,938,000 | 4,417,796,000
Reported Value Measurement |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities | 4,691,938,000 | 4,417,796,000
US Treasury Securities |  |
Available-for-sale securities |  |
Amortized cost |  | 49,752,000
Gross unrealized losses |  | (359,000)
US Treasury Securities | Estimated Fair Value |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities |  | 49,393,000
US Treasury Securities | Reported Value Measurement |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities |  | 49,393,000
Residential mortgage-backed securities |  |
Available-for-sale securities |  |
Amortized cost | 5,227,139,000 | 4,805,735,000
Gross unrealized gains |  | 3,145,000
Gross unrealized losses | (681,539,000) | (599,668,000)
Residential mortgage-backed securities | Estimated Fair Value |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities | 4,545,600,000 | 4,209,212,000
Residential mortgage-backed securities | Reported Value Measurement |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities | 4,545,600,000 | 4,209,212,000
US Government Corporations and Agencies Securities [Member] |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities | 890,723,000 | 681,121,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities | 3,654,877,000 | 3,528,091,000
States and political subdivisions |  |
Available-for-sale securities |  |
Amortized cost | 161,118,000 | 163,509,000
Gross unrealized gains |  | 927,000
Gross unrealized losses | (14,780,000) | (5,245,000)
States and political subdivisions | Estimated Fair Value |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities | 146,338,000 | 159,191,000
States and political subdivisions | Reported Value Measurement |  |
Available-for-sale securities |  |
Estimated fair value, Available for sale securities | 146,338,000 | 159,191,000
Other Debt Obligations |  |
Held-to-maturity securities |  |
Amortized Value | 3,400,000 | 3,400,000
Estimated fair value | 3,400,000 | 3,400,000
Carrying Value | $ 3,400,000 | $ 3,400,000

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