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Fair Value (Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | $ 2,498,761 | $ 2,516,908
Derivative assets |  | 1,859 | 4,788
Derivative liabilities |  | 5,663 | 26,846
Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 2,498,761 | 2,516,908
Derivative assets | [1] | 14,959 | 20,315
Total recurring fair value measurements - assets |  | 2,513,720 | 2,537,223
Derivative liabilities | [1] | 12,877 | 27,432
Total recurring fair value measurements - liabilities |  | 12,877 | 27,432
Recurring [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 2,498,761 | 2,516,908
Derivative assets | [1] | 14,959 | 20,315
Total recurring fair value measurements - assets |  | 2,513,720 | 2,537,223
Derivative liabilities | [1] | 12,877 | 27,432
Total recurring fair value measurements - liabilities |  | 12,877 | 27,432
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 securities |  | 74,496 | 54,828
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 securities |  | 74,496 | 54,828
Recurring [Member] | Municipal Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 241,036 | 242,155
Recurring [Member] | Municipal Obligations [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 241,036 | 242,155
Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 3,500 | 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 securities |  | 3,500 | 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 securities |  | 1,559,417 | 1,611,355
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 securities |  | 1,559,417 | 1,611,355
Recurring [Member] | Commercial Mortgage-Backed Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 428,048 | 402,591
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 securities |  | 428,048 | 402,591
Recurring [Member] | Collateralized Mortgage Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 192,264 | 202,479
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 securities |  | $ 192,264 | $ 202,479
[1] | For further disaggregation of derivative assets and liabilities, see Note 6 - Derivatives.

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