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Investments (Private Label Mortgage Backed Securities) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]        
Amortized cost $ 175,324 $ 169,399    
Investment securities available for sale, at fair value 176,424 171,751    
Cumulative OTTI Charges 555 535 $ 515 $ 515
Private-Label Mortgage-Backed Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Amortized cost 1,502 1,675    
Investment securities available for sale, at fair value 1,560 $ 1,695    
Gross Unrealized Gain (Loss) 58      
Cumulative OTTI Charges $ 555      
Lowest Credit Rating Assigned: Standard & Poor's, BBB+ Rating [Member] | RALI2004-QS4 A7 [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Origination Date Mar. 01, 2004      
Amortized cost $ 43      
Investment securities available for sale, at fair value $ 43      
Collateral Type ALT A      
Credit Support % 11.84%      
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 $ 385      
Investment securities available for sale, at fair value 393      
Gross Unrealized Gain (Loss) $ 8      
Collateral Type ALT A      
Credit Support % 14.11%      
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 $ 236      
Investment securities available for sale, at fair value 251      
Gross Unrealized Gain (Loss) $ 15      
Collateral Type ALT A      
Credit Support % 5.20%      
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 $ 502      
Investment securities available for sale, at fair value 523      
Gross Unrealized Gain (Loss) $ 21      
Collateral Type ALT A      
Cumulative OTTI Charges $ 313      
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 $ 72      
Investment securities available for sale, at fair value 80      
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 $ 264      
Investment securities available for sale, at fair value 270      
Gross Unrealized Gain (Loss) $ 6      
Collateral Type ALT A      
Cumulative OTTI Charges $ 217