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Investment Securities (Summary Of Available For Sale Investment Securities By Maturity Groupings) (Details) - USD ($) | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 9,680,135,000 | $ 10,127,426,000
Fair Value | 8,915,779,000 | 9,136,853,000
U.S. government and federal agency obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,586,856,000 | 2,594,130,000
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost | 439,321,000 |
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost | 1,429,778,000 |
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 5 through 10 Years, Amortized Cost | 717,757,000 |
Fair Value | 2,597,737,000 | 2,555,252,000
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value | 439,782,000 |
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value | 1,437,921,000 |
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 5 through 10 Years, Fair Value | 720,034,000 |
Government-sponsored enterprise obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 55,032,000 | 55,425,000
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 5 through 10 Years, Amortized Cost | 35,212,000 |
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost | 19,820,000 |
Fair Value | 44,148,000 | 42,849,000
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 5 through 10 Years, Fair Value | 30,195,000 |
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value | 13,953,000 |
State and municipal obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 774,740,000 | 822,790,000
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost | 70,837,000 |
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost | 416,047,000 |
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 5 through 10 Years, Amortized Cost | 176,358,000 |
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost | 111,498,000 |
Fair Value | 714,958,000 | 742,891,000
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value | 70,298,000 |
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value | 393,723,000 |
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 5 through 10 Years, Fair Value | 155,555,000 |
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value | 95,382,000 |
Agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 3,991,521,000 | 4,195,182,000
Fair Value | 3,356,039,000 | 3,444,891,000
Non-Agency Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 539,853,000 | 625,539,000
Fair Value | 499,996,000 | 568,689,000
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,516,911,000 | 1,595,797,000
Fair Value | 1,496,323,000 | 1,557,015,000
Total Mortgage And Asset-Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 6,048,285,000 | 6,416,518,000
Fair Value | 5,352,358,000 | 5,570,595,000
Other debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 215,222,000 | 238,563,000
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost | 24,459,000 |
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost | 73,750,000 |
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 5 through 10 Years, Amortized Cost | 92,265,000 |
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost | 24,748,000 |
Fair Value | 206,578,000 | $ 225,266,000
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value | 24,152,000 |
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value | 68,648,000 |
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 5 through 10 Years, Fair Value | 89,325,000 |
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value | $ 24,453,000 |

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