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Investments (Private Label Mortgage Backed Securities) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]        
Amortized cost $ 152,653 $ 158,335    
Available for sale 155,345 159,473    
Cumulative OTTI Charges 585 555 $ 555 $ 535
Private-Label Mortgage-Backed Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Amortized cost 1,137 1,335    
Available for sale 1,187 $ 1,372    
Gross Unrealized Gain (Loss) 50      
Cumulative OTTI Charges $ 585      
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 $ 317      
Available for sale 310      
Gross Unrealized Gain (Loss) $ (7)      
Collateral Type ALT A      
Credit Support % 15.01%      
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 $ 168      
Available for sale 181      
Gross Unrealized Gain (Loss) $ 13      
Collateral Type ALT A      
Credit Support % 4.56%      
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 $ 400      
Available for sale 417      
Gross Unrealized Gain (Loss) $ 17      
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 $ 45      
Available for sale 53      
Gross Unrealized Gain (Loss) $ 8      
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 $ 207      
Available for sale 226      
Gross Unrealized Gain (Loss) $ 19      
Collateral Type ALT A      
Cumulative OTTI Charges $ 237