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Intangible assets, net - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount of intangible assets $ 1,091    
Amortization expense of intangible assets 1,195 $ 1,334 $ 326
Core Deposit [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount of intangible assets 8,146 8,146  
Accumulated amortization on intangible assets 3,957 2,808  
Trade Name [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount of intangible assets 203 203  
Accumulated amortization on intangible assets $ 73 $ 40