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Investments (Private Label Mortgage Backed Securities) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]        
Amortized cost $ 160,351 $ 158,335    
Available for sale 163,557 159,473    
Cumulative OTTI Charges 575 555 $ 555 $ 535
Private-Label Mortgage-Backed Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Amortized cost 1,201 1,335    
Available for sale 1,223 $ 1,372    
Unrealized Gain (Loss) 22      
Cumulative OTTI Charges $ 575      
Lowest Credit Rating Assigned: Standard & Poor's, CCC Rating [Member] | MALT2004-6 7A1 [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Origination Date Jun. 01, 2004      
Amortized cost $ 322      
Available for sale 319      
Unrealized Gain (Loss) $ (3)      
Collateral Type ALT A      
Credit Support % 15.07%      
Lowest Credit Rating Assigned: Standard & Poor's, CC Rating [Member] | RALI2005-QS2 A1 [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Origination Date Feb. 01, 2005      
Amortized cost $ 176      
Available for sale 187      
Unrealized Gain (Loss) $ 11      
Collateral Type ALT A      
Credit Support % 4.83%      
Cumulative OTTI Charges $ 10      
Lowest Credit Rating Assigned: Standard & Poor's, D Rating [Member] | RALI2006-QS4 A2 [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Origination Date Apr. 01, 2006      
Amortized cost $ 425      
Available for sale 423      
Unrealized Gain (Loss) $ (2)      
Collateral Type ALT A      
Cumulative OTTI Charges $ 323      
Lowest Credit Rating Assigned: Standard & Poor's, D Rating [Member] | GSR 2006-5F 2A1 [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Origination Date May 01, 2006      
Amortized cost $ 53      
Available for sale 60      
Unrealized Gain (Loss) $ 7      
Collateral Type Prime      
Cumulative OTTI Charges $ 15      
Lowest Credit Rating Assigned: Standard & Poor's, D Rating [Member] | RALI2006-QS8 A1 [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Origination Date Jul. 28, 2006      
Amortized cost $ 225      
Available for sale 234      
Unrealized Gain (Loss) $ 9      
Collateral Type ALT A      
Cumulative OTTI Charges $ 227