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Fair Value Measurements (Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | $ 3,549,657 | $ 2,691,037
Derivative assets |  | 24 | 3,325
Derivative liabilities |  | 14,620 | 2,160
Total recurring fair value measurements - liabilities |  | 6,200 | 7,300
Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 3,549,657 | 2,691,037
Derivative assets | [1] | 71,904 | 16,980
Total fair value measurements |  | 3,621,561 | 2,708,017
Derivative liabilities | [1] | 23,467 | 22,227
Total recurring fair value measurements - liabilities |  | 23,467 | 22,227
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 |  | 95,141 | 71,706
Recurring [Member] | Municipal Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 252,163 | 240,427
Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 3,897 | 3,500
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 |  | 1,339,471 | 1,443,402
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 |  | 1,624,169 | 770,077
Recurring [Member] | Collateralized Mortgage Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 234,816 | 161,925
Recurring [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale debt securities |  | 3,549,657 | 2,691,037
Derivative assets | [1] | 71,904 | 16,980
Total fair value measurements |  | 3,621,561 | 2,708,017
Derivative liabilities | [1] | 17,218 | 14,923
Total recurring fair value measurements - liabilities |  | 17,218 | 14,923
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 |  | 95,141 | 71,706
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 |  | 252,163 | 240,427
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 |  | 3,897 | 3,500
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 |  | 1,339,471 | 1,443,402
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 |  | 1,624,169 | 770,077
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 |  | 234,816 | 161,925
Recurring [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative liabilities | [1] | 6,249 | 7,304
Total recurring fair value measurements - liabilities |  | $ 6,249 | $ 7,304
[1] | For further disaggregation of derivative assets and liabilities, see Note 7 - Derivatives.

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