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Securities Held to Maturity (Details)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
security
Dec. 31, 2014
USD ($)
security
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 3,921 $ 3,609
Gross Unrealized Gains 44 82
Gross Unrealized Losses 0 0
Estimated Fair Value $ 3,965 $ 3,691
Held-to-maturity securities in an unrealized loss position | security 0 0
Mortgage Backed Securities Pass Through Certificates    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 3,921 $ 3,609
Gross Unrealized Gains 44 82
Gross Unrealized Losses 0 0
Estimated Fair Value $ 3,965 $ 3,691