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Investment Securities (Details 4) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of residential collateralized mortgage obligation securities        
Amortized Cost $ 36,154 $ 10,099    
Fair Value 36,340 11,010    
Year-to- date Impairment Charge 38 78 98  
Life-to-date Impairment Charge 1,451 1,413 1,335 1,237
Alt-A
       
Schedule of residential collateralized mortgage obligation securities        
Par Value 750      
Amortized Cost 243      
Fair Value 258 [1]      
Aggregate Unrealized Gain 15      
Year-to- date Change in Unrealized Gain 26      
Year-to- date Impairment Charge 28      
Life-to-date Impairment Charge 682 [2]      
Prime
       
Schedule of residential collateralized mortgage obligation securities        
Par Value 1,241      
Amortized Cost 805      
Fair Value 947 [1]      
Aggregate Unrealized Gain 142      
Year-to- date Change in Unrealized Gain (7)      
Year-to- date Impairment Charge 10      
Life-to-date Impairment Charge 769 [2]      
Private residential collateralized mortgage obligations
       
Schedule of residential collateralized mortgage obligation securities        
Par Value 1,991      
Amortized Cost 1,048 1,168    
Fair Value 1,205 [1] 1,306    
Aggregate Unrealized Gain 157      
Year-to- date Change in Unrealized Gain 19      
Year-to- date Impairment Charge 38      
Life-to-date Impairment Charge $ 1,451 [2]      
AAA
       
Schedule of residential collateralized mortgage obligation securities        
Current Ratings 0.00%      
AAA | Alt-A
       
Schedule of residential collateralized mortgage obligation securities        
Current Ratings 0.00%      
AAA | Prime
       
Schedule of residential collateralized mortgage obligation securities        
Current Ratings 0.00%      
AA
       
Schedule of residential collateralized mortgage obligation securities        
Current Ratings 0.00%      
AA | Alt-A
       
Schedule of residential collateralized mortgage obligation securities        
Current Ratings 0.00%      
AA | Prime
       
Schedule of residential collateralized mortgage obligation securities        
Current Ratings 0.00%      
A
       
Schedule of residential collateralized mortgage obligation securities        
Current Ratings 0.00%      
A | Alt-A
       
Schedule of residential collateralized mortgage obligation securities        
Current Ratings 0.00%      
A | Prime
       
Schedule of residential collateralized mortgage obligation securities        
Current Ratings 0.00%      
BBB
       
Schedule of residential collateralized mortgage obligation securities        
Current Ratings 6.00%      
BBB | Alt-A
       
Schedule of residential collateralized mortgage obligation securities        
Current Ratings 0.00%      
BBB | Prime
       
Schedule of residential collateralized mortgage obligation securities        
Current Ratings 7.00%      
Below Investment Grade
       
Schedule of residential collateralized mortgage obligation securities        
Current Ratings 94.00%      
Below Investment Grade | Alt-A
       
Schedule of residential collateralized mortgage obligation securities        
Current Ratings 100.00%      
Below Investment Grade | Prime
       
Schedule of residential collateralized mortgage obligation securities        
Current Ratings 93.00%      
[1] Level two valuation assumptions were used to determine the fair value of held to maturity securities in the Fund.
[2] Life-to-date impairment charge represents impairment charges recognized in earnings subsequent to redemption of the Fund.