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Investment securities and impairment of investment securities (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Amortized cost    
Total $ 117,724 $ 121,366
Gross unrealized holding gains    
Total 3,209 2,755
Gross unrealized holding losses    
Total   (60)
Fair value    
Total 120,933 124,061
Municipal securities
   
Amortized cost    
Due in five years - ten years 8,004 8,002
Due after ten years 61,318 61,314
Gross unrealized holding gains    
Due in five years - ten years 185 172
Due after ten years 1,488 1,178
Gross unrealized holding losses    
Due after ten years   (27)
Fair value    
Due in five years - ten years 8,189 8,174
Due after ten years 62,806 62,465
Residential mortgage-backed securities
   
Amortized cost    
Total 48,402 52,050
Gross unrealized holding gains    
Total 1,536 1,405
Gross unrealized holding losses    
Total   (33)
Fair value    
Total 49,938 53,422
Fixed rate | Pass-through
   
Amortized cost    
Total 10,448 11,101
Gross unrealized holding gains    
Total 538 544
Fair value    
Total 10,986 11,645
Fixed rate | Agency CMOs
   
Amortized cost    
Total 31,771 34,425
Gross unrealized holding gains    
Total 916 780
Gross unrealized holding losses    
Total   (33)
Fair value    
Total 32,687 35,172
Variable rate | Pass-through
   
Amortized cost    
Total 4,903 5,172
Gross unrealized holding gains    
Total 63 71
Fair value    
Total 4,966 5,243
Variable rate | Agency CMOs
   
Amortized cost    
Total 1,280 1,352
Gross unrealized holding gains    
Total 19 10
Fair value    
Total $ 1,299 $ 1,362