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Loans, net and allowance for loan losses - Major Classification of Loans Portfolio Summarized by Credit Quality (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable    
Loans, net $ 1,849,602 $ 1,823,266
Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 516,756 494,134
Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 917,035 907,803
Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 299,330 299,876
Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 299,330 299,876
Consumer    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 116,481 121,453
Pass    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 1,816,312 1,795,367
Pass | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 509,531 491,531
Pass | Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 894,059 886,849
Pass | Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 296,497 295,758
Pass | Consumer    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 116,225 121,229
Special Mention    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 8,754 10,160
Special Mention | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 3,090 869
Special Mention | Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 5,309 8,934
Special Mention | Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 355 357
Substandard    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 24,536 17,739
Substandard | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 4,135 1,734
Substandard | Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 17,667 12,020
Substandard | Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 2,478 3,761
Substandard | Consumer    
Accounts, Notes, Loans and Financing Receivable    
Loans, net $ 256 $ 224