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Loans, net and allowance for loan losses - Major Classifications of Loans Outstanding (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable    
Loans, net $ 1,753,389 $ 1,693,065
Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 469,318 476,199
Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 867,349 786,210
Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 290,831 287,935
Consumer    
Accounts, Notes, Loans and Financing Receivable    
Loans, net $ 125,891 $ 142,721