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Fair Value Measurement (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Available-for-sale securities $ 19,759 $ 20,222
Significant Other Observable Inputs (Level 2)    
Available-for-sale securities 19,759 20,222
Collateralized Mortgage Obligations [Member]    
Available-for-sale securities 9,545 9,752
SBA Pool Securities [Member]    
Available-for-sale securities 10,214 10,470
Fair Value, Measurements, Recurring [Member] | Fair Value [Member]    
Available-for-sale securities 19,759 20,222
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Significant Other Observable Inputs (Level 2)    
Available-for-sale securities 19,759 20,222
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations [Member] | Fair Value [Member]    
Available-for-sale securities 9,545 9,752
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations [Member] | Fair Value [Member] | Significant Other Observable Inputs (Level 2)    
Available-for-sale securities 9,545 9,752
Fair Value, Measurements, Recurring [Member] | SBA Pool Securities [Member] | Fair Value [Member]    
Available-for-sale securities 10,214 10,470
Fair Value, Measurements, Recurring [Member] | SBA Pool Securities [Member] | Fair Value [Member] | Significant Other Observable Inputs (Level 2)    
Available-for-sale securities $ 10,214 $ 10,470