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Securities Held to Maturity (Tables)
 6 Months Ended
Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
The following is a summary of mortgage-backed securities held-to-maturity at June 30, 2015, and December 31, 2014 (in thousands). 
 
June 30, 2015
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
Mortgage-backed securities:
 

 
 

 
 

 
 

Pass-through certificates:
 

 
 

 
 

 
 

GSEs
$
3,921

 
$
44

 
$
—

 
$
3,965

Total securities held-to-maturity
$
3,921

 
$
44

 
$
—

 
$
3,965

 
December 31, 2014
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
Mortgage-backed securities:
 

 
 

 
 

 
 

Pass-through certificates:
 

 
 

 
 

 
 

GSEs
$
3,609

 
$
82

 
$
—

 
$
3,691

Total securities held-to-maturity
$
3,609

 
$
82

 
$
—

 
$
3,691