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Fair Value (Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | $ 2,149,466 | $ 2,093,404
Derivative assets | [1] | 36,479 | 23,251
Total recurring fair value measurements - assets |  | 2,185,945 | 2,116,655
Derivative liabilities | [1] | 36,336 | 23,968
Total recurring fair value measurements - liabilities |  | 36,336 | 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 |  | 125 | 134
Municipal Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 87,939 | 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 |  | 1,765,974 | 1,758,373
Collateralized Mortgage Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 289,166 | 289,033
Equity Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 2,762 | 2,757
Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 2,762 | 2,757
Total recurring fair value measurements - assets |  | 2,762 | 2,757
Level 1 [Member] | Equity Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 2,762 | 2,757
Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 2,146,704 | 2,090,647
Derivative assets | [1] | 36,479 | 23,251
Total recurring fair value measurements - assets |  | 2,183,183 | 2,113,898
Derivative liabilities | [1] | 36,336 | 23,968
Total recurring fair value measurements - liabilities |  | 36,336 | 23,968
Level 2 [Member] | US Treasury and Government Agency Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 125 | 134
Level 2 [Member] | Municipal Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 87,939 | 39,607
Level 2 [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
Level 2 [Member] | Mortgage-Backed Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 1,765,974 | 1,758,373
Level 2 [Member] | Collateralized Mortgage Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | $ 289,166 | $ 289,033
[1] | For further disaggregation of derivative assets and liabilities, see Note 6 - Derivatives.

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