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Fair Value Measurements (Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | $ 49,736 | $ 71,893
Derivative liabilities |  | 42,453 | 54,707
Total recurring fair value measurements - liabilities |  | 1,900 | 2,100
Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 5,793,670 | 5,161,491
Mortgage loans held for sale |  | 33,161 | 18,929
Derivative assets | [1] | 68,156 | 73,840
Total fair value measurements |  | 5,894,987 | 5,254,260
Derivative liabilities | [1] | 106,582 | 160,623
Total recurring fair value measurements - liabilities |  | 106,582 | 160,623
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 |  | 291,993 | 182,282
Recurring [Member] | Municipal Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 193,133 | 196,330
Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 16,590 | 17,616
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 |  | 2,315,510 | 2,129,051
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 |  | 2,948,416 | 2,600,965
Recurring [Member] | Collateralized Mortgage Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 28,028 | 35,247
Recurring [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 5,793,670 | 5,161,491
Mortgage loans held for sale |  | 33,161 | 18,929
Derivative assets | [1] | 68,156 | 73,840
Total fair value measurements |  | 5,894,987 | 5,254,260
Derivative liabilities | [1] | 104,727 | 158,534
Total recurring fair value measurements - liabilities |  | 104,727 | 158,534
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 |  | 291,993 | 182,282
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 |  | 193,133 | 196,330
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 |  | 16,590 | 17,616
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 |  | 2,315,510 | 2,129,051
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 |  | 2,948,416 | 2,600,965
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 |  | 28,028 | 35,247
Recurring [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative liabilities | [1] | 1,855 | 2,089
Total recurring fair value measurements - liabilities |  | $ 1,855 | $ 2,089
[1] | For further disaggregation of derivative assets and liabilities, see Note 7 - Derivatives.

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