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Fair Value Measurements (Details 2) - Residential mortgage-backed securities
$ in Thousands
9 Months Ended
Sep. 30, 2015
USD ($)
Reconciliation of activity for mortgage-backed securities on a net basis  
Balance at the beginning of the period $ 24,063
Principal paydowns (2,453)
Total unrealized losses included in:  
Other comprehensive income 850
Impairment realized (700)
Balance at the end of the period $ 21,760