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Fair Value Measurements (Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | $ 55,440 | $ 84,458
Derivative liabilities |  | 52,690 | 87,567
Total recurring fair value measurements - liabilities |  | 2,300 | 1,300
Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 5,296,147 | 4,915,195
Mortgage loans held for sale |  | 23,462 | 13,269
Derivative assets | [1] | 69,815 | 90,712
Total fair value measurements |  | 5,389,424 | 5,019,176
Derivative liabilities | [1] | 132,029 | 207,138
Total recurring fair value measurements - liabilities |  | 132,029 | 207,138
Recurring [Member] | U.S. Treasury And Government Agency Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 173,768 | 97,808
Recurring [Member] | Municipal Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 199,359 | 201,412
Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 21,454 | 20,352
Recurring [Member] | Residential Mortgage-Backed Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 2,195,672 | 2,113,866
Recurring [Member] | Commercial Mortgage-Backed Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 2,667,908 | 2,437,472
Recurring [Member] | Collateralized Mortgage Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 37,986 | 44,285
Recurring [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 5,296,147 | 4,915,195
Mortgage loans held for sale |  | 23,462 | 13,269
Derivative assets | [1] | 69,815 | 90,712
Total fair value measurements |  | 5,389,424 | 5,019,176
Derivative liabilities | [1] | 129,768 | 205,796
Total recurring fair value measurements - liabilities |  | 129,768 | 205,796
Recurring [Member] | Level 2 [Member] | U.S. Treasury And Government Agency Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 173,768 | 97,808
Recurring [Member] | Level 2 [Member] | Municipal Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 199,359 | 201,412
Recurring [Member] | Level 2 [Member] | Corporate Debt Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 21,454 | 20,352
Recurring [Member] | Level 2 [Member] | Residential Mortgage-Backed Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 2,195,672 | 2,113,866
Recurring [Member] | Level 2 [Member] | Commercial Mortgage-Backed Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 2,667,908 | 2,437,472
Recurring [Member] | Level 2 [Member] | Collateralized Mortgage Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 37,986 | 44,285
Recurring [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative liabilities | [1] | 2,261 | 1,342
Total recurring fair value measurements - liabilities |  | $ 2,261 | $ 1,342
[1] | For further disaggregation of derivative assets and liabilities, see Note 6 - Derivatives.

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