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Fair Value Measurements (Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Values, Assets |  | $ 114,680 | $ 6,908
Fair Values, Liabilities |  | 37,879 | 22,244
Total recurring fair value measurements - liabilities |  | 2,300 | 4,100
Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 5,466,843 | 6,986,698
Mortgage loans held for sale |  | 15,149 | 41,022
Fair Values, Assets | [1] | 119,100 | 75,867
Total fair value measurements |  | 5,601,092 | 7,103,587
Fair Values, Liabilities | [1] | 226,438 | 35,046
Total recurring fair value measurements - liabilities |  | 226,438 | 35,046
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 |  | 42,287 | 419,298
Recurring [Member] | Municipal Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 197,865 | 314,158
Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 21,317 | 18,702
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 |  | 2,306,365 | 3,035,798
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 |  | 2,823,920 | 3,077,859
Recurring [Member] | Collateralized Mortgage Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 75,089 | 120,883
Recurring [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 5,466,843 | 6,986,698
Mortgage loans held for sale |  | 15,149 | 41,022
Fair Values, Assets | [1] | 119,100 | 75,867
Total fair value measurements |  | 5,601,092 | 7,103,587
Fair Values, Liabilities | [1] | 224,143 | 30,930
Total recurring fair value measurements - liabilities |  | 224,143 | 30,930
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 |  | 42,287 | 419,298
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 |  | 197,865 | 314,158
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 |  | 21,317 | 18,702
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 |  | 2,306,365 | 3,035,798
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 |  | 2,823,920 | 3,077,859
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 |  | 75,089 | 120,883
Recurring [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Values, Liabilities | [1] | 2,295 | 4,116
Total recurring fair value measurements - liabilities |  | $ 2,295 | $ 4,116
[1] | For further disaggregation of derivative assets and liabilities, see Note 5 - Derivatives.

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