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Premises and equipment, net - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]      
Depreciation and amortization $ 1,595 $ 1,671 $ 924
Rent expense $ 397 $ 343 $ 216
Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Leases extension period 1 year    
Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Leases extension period 10 years