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Securities Available-for-Sale (Narrative) (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
security
Jun. 30, 2014
USD ($)
Schedule of Available-for-sale Securities [Line Items]        
Proceeds from sale of securities available-for-sale | $ $ 39,183,000 $ 6,400,000 $ 39,226,000 $ 7,270,000
Gross realized gains on sales of securities available-for-sale | $ 46,000 144,000 46,000 199,000,000
Gross realized losses on sales of securities available-for-sale | $ 3,000 0 3,000 0
Recognized gains (losses) on trading securities portfolio | $ (50,000) 175,000,000 11,000 244,000,000
Impairment charges against earnings | $ $ 0 $ 0 $ 0 $ 0
Continuous Unrealized Loss Position Less Than 12 Months | Non-GSE | Real Estate Mortgage Investment Conduits (REMICs)        
Schedule of Available-for-sale Securities [Line Items]        
Number of securities (securities)     2  
Continuous Unrealized Loss Position Less Than 12 Months | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Number of securities (securities)     3  
Pass Through | Continuous Unrealized Loss Position 12 Months Or Longer | GSE | Real Estate Mortgage Investment Conduits (REMICs)        
Schedule of Available-for-sale Securities [Line Items]        
Number of securities (securities)     11  
Pass Through | Continuous Unrealized Loss Position Less Than 12 Months | GSE | Pass-through Certificates        
Schedule of Available-for-sale Securities [Line Items]        
Number of securities (securities)     3  
Non Pass Through | Continuous Unrealized Loss Position 12 Months Or Longer | GSE | Real Estate Mortgage Investment Conduits (REMICs)        
Schedule of Available-for-sale Securities [Line Items]        
Number of securities (securities)     12  
Non Pass Through | Continuous Unrealized Loss Position Less Than 12 Months | GSE | Real Estate Mortgage Investment Conduits (REMICs)        
Schedule of Available-for-sale Securities [Line Items]        
Number of securities (securities)     1