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Fair Value (Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | $ 2,308,812 | $ 2,093,404
Derivative assets | [1] | 43,903 | 23,251
Total recurring fair value measurements - assets |  | 2,352,715 | 2,116,655
Derivative liabilities | [1] | 43,184 | 23,968
Total recurring fair value measurements - liabilities |  | 43,184 | 23,968
US Treasury and Government Agency Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 116 | 134
Municipal Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 156,292 | 39,607
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
Mortgage-Backed Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 1,906,346 | 1,758,373
Collateralized Mortgage Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 241,346 | 289,033
Equity Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 1,212 | 2,757
Recurring [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 1,212 | 2,757
Total recurring fair value measurements - assets |  | 1,212 | 2,757
Recurring [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 2,307,600 | 2,090,647
Derivative assets | [1] | 43,903 | 23,251
Total recurring fair value measurements - assets |  | 2,351,503 | 2,113,898
Derivative liabilities | [1] | 43,184 | 23,968
Total recurring fair value measurements - liabilities |  | 43,184 | 23,968
Recurring [Member] | US 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 |  | 116 | 134
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 |  | 156,292 | 39,607
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] | Mortgage-Backed Securities [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 1,906,346 | 1,758,373
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 |  | 241,346 | 289,033
Recurring [Member] | Equity Securities [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | $ 1,212 | $ 2,757
[1] | For further disaggregation of derivative assets and liabilities, see Note 6 - Derivatives.

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