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Regulatory Capital Matters (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Jan. 01, 2016
Regulatory Capital Matters [Abstract]      
Percent of Qualified Thrift Lender test requires 65.00%    
Common equity tier 1 capital to risk-weighted assets, ratio 4.50%    
Capital conservation buffer 2.50%   0.625%
Common Equity Tier 1 capital to risk weighted assets, upon full implementation, ratio 7.00%    
Tier 1 capital to risk-weighted assets, ratio 6.00%    
Tier 1 capital to risk weighted assets, upon full implementation, ratio 8.50%    
Total capital to risk-weighted assets, ratio 8.00%    
Total capital to risk weighted assets, upon full implementation, ratio 10.50%    
Minimum leverage ratio 4.00%    
Capital conservative buffer phase period 4 years    
Tier 1 (Core) Capital 5.00% 5.00%  
Total capital to risk weighted assets 10.00% 10.00%  
Opening Balance in Liquidation Account $ 14,300    
Future percent, common equity of risk-weighted assets 2.50%