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Loans, net and allowance for loan losses - Major Classification of Loans Portfolio Summarized by Credit Quality (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable    
Loans, net $ 1,779,445 $ 1,693,065
Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 478,128 476,199
Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 881,071 786,210
Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 297,819 287,935
Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 297,819 287,935
Consumer    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 122,427 142,721
Pass    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 1,744,938 1,661,496
Pass | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 473,685 472,185
Pass | Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 856,513 764,320
Pass | Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 292,530 282,484
Pass | Consumer    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 122,210 142,507
Special Mention    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 13,823 14,991
Special Mention | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 1,542 1,958
Special Mention | Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 11,920 13,015
Special Mention | Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 361 18
Substandard    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 20,684 16,578
Substandard | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 2,901 2,056
Substandard | Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 12,638 8,875
Substandard | Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 4,928 5,433
Substandard | Consumer    
Accounts, Notes, Loans and Financing Receivable    
Loans, net $ 217 $ 214