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Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Securities Available for Sale, Amortized Cost | $ 5,745,280 | $ 5,496,718
Securities Available for Sale, Gross Unrealized Gains | 24,384 | 11,570
Securities Available for Sale, Gross Unrealized Losses | 473,517 | 593,093
Securities Available for Sale, Fair Value | 5,296,147 | 4,915,195
U.S. Treasury And Government Agency Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities Available for Sale, Amortized Cost | 171,333 | 97,741
Securities Available for Sale, Gross Unrealized Gains | 3,806 | 1,581
Securities Available for Sale, Gross Unrealized Losses | 1,371 | 1,514
Securities Available for Sale, Fair Value | 173,768 | 97,808
Municipal Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities Available for Sale, Amortized Cost | 201,128 | 203,533
Securities Available for Sale, Gross Unrealized Gains | 55 | 79
Securities Available for Sale, Gross Unrealized Losses | 1,824 | 2,200
Securities Available for Sale, Fair Value | 199,359 | 201,412
Residential Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities Available for Sale, Amortized Cost | 2,469,381 | 2,440,411
Securities Available for Sale, Gross Unrealized Gains | 6,687 | 2,734
Securities Available for Sale, Gross Unrealized Losses | 280,396 | 329,279
Securities Available for Sale, Fair Value | 2,195,672 | 2,113,866
Commercial Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities Available for Sale, Amortized Cost | 2,839,988 | 2,683,872
Securities Available for Sale, Gross Unrealized Gains | 13,836 | 7,176
Securities Available for Sale, Gross Unrealized Losses | 185,916 | 253,576
Securities Available for Sale, Fair Value | 2,667,908 | 2,437,472
Collateralized Mortgage Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities Available for Sale, Amortized Cost | 39,950 | 47,661
Securities Available for Sale, Gross Unrealized Losses | 1,964 | 3,376
Securities Available for Sale, Fair Value | 37,986 | 44,285
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities Available for Sale, Amortized Cost | 23,500 | 23,500
Securities Available for Sale, Gross Unrealized Losses | 2,046 | 3,148
Securities Available for Sale, Fair Value | $ 21,454 | $ 20,352

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