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Derivative Financial Instruments (Schedule of Notional Amounts and Fair Values of Derivatives Outstanding) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Derivative [Line Items] |  |
Derivative liabilities, Fair Value | $ 21 | $ 2,208
Interest Rate Swap [Member] | Cash Flow Hedging [Member] |  |
Derivative [Line Items] |  |
Derivative liabilities, Notional Amount | 23,223 | 39,000
Derivative liabilities, Fair Value | 21 | 406
Nondesignated [Member] |  |
Derivative [Line Items] |  |
Derivative assets, Fair Value | 18,965 | 24,549
Nondesignated [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative liabilities, Notional Amount |  | 51,630
Derivative liabilities, Fair Value |  | 1,549
Nondesignated [Member] | Interest Rate Cap [Member] |  |
Derivative [Line Items] |  |
Derivative assets, Notional Amount | 2,194,210 | 1,715,002
Derivative assets, Fair Value | $ 18,965 | 24,549
Nondesignated [Member] | Interest Rate Floor [Member] |  |
Derivative [Line Items] |  |
Derivative liabilities, Notional Amount |  | 35,440
Derivative liabilities, Fair Value |  | $ 253

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