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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