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Fair Value Measurements (Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities | $ 2,915,648 | $ 2,910,869
Derivative assets | 4,508 | 2,148
Derivative liabilities | 1,584 | 3,938
Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities | 2,915,648 | 2,910,869
Derivative assets | 12,682 | 14,157
Total recurring fair value measurements - assets | 2,928,330 | 2,925,026
Derivative liabilities | 22,529 | 14,389
Total recurring fair value measurements - liabilities | 22,529 | 14,389
Recurring [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities | 2,915,648 | 2,910,869
Derivative assets | 12,682 | 14,157
Total recurring fair value measurements - assets | 2,928,330 | 2,925,026
Derivative liabilities | 22,529 | 14,389
Total recurring fair value measurements - liabilities | 22,529 | 14,389
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 | 93,884 | 97,272
Recurring [Member] | U.S. Treasury And Government Agency Securities [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities | 93,884 | 97,272
Recurring [Member] | Municipal Obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities | 237,291 | 243,786
Recurring [Member] | Municipal Obligations [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities | 237,291 | 243,786
Recurring [Member] | Corporate Debt Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities | 5,500 | 3,500
Recurring [Member] | Corporate Debt Securities [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities | 5,500 | 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 | 1,743,543 | 1,715,213
Recurring [Member] | Residential Mortgage-Backed Securities [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities | 1,743,543 | 1,715,213
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 | 680,272 | 687,135
Recurring [Member] | Commercial Mortgage-Backed Securities [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities | 680,272 | 687,135
Recurring [Member] | Collateralized Mortgage Obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities | 155,158 | 163,963
Recurring [Member] | Collateralized Mortgage Obligations [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities | $ 155,158 | $ 163,963

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