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Investments (Private Label Mortgage Backed Securities) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]        
Amortized cost $ 135,037 $ 143,895    
Available for sale 136,036 143,875    
Cumulative OTTI Charges 595 595 $ 575 $ 555
Private-Label Mortgage-Backed Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Amortized cost 946 1,053    
Available for sale 1,014 $ 1,104    
Unrealized Gain (Loss) 68      
Cumulative OTTI Charges $ 595      
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 $ 252      
Available for sale 254      
Unrealized Gain (Loss) $ 2      
Collateral Type ALT A      
Credit Support % 16.24%      
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 $ 129      
Available for sale 144      
Unrealized Gain (Loss) $ 15      
Collateral Type ALT A      
Credit Support % 0.71%      
Cumulative OTTI Charges $ 15      
Lowest Credit Rating Assigned: Caa3 Rating [Member] | RALI2006-QS4 A2 [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Origination Date Apr. 01, 2006      
Amortized cost $ 356      
Available for sale 381      
Unrealized Gain (Loss) $ 25      
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 $ 35      
Available for sale 42      
Unrealized Gain (Loss) $ 7      
Collateral Type Prime      
Cumulative OTTI Charges $ 15      
Lowest Credit Rating Assigned: Ca Rating [Member] | RALI2006-QS8 A1 [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Origination Date Jul. 28, 2006      
Amortized cost $ 174      
Available for sale 193      
Unrealized Gain (Loss) $ 19      
Collateral Type ALT A      
Cumulative OTTI Charges $ 242