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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, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable    
Loans $ 2,023,155 $ 1,938,240
Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans 537,949 522,957
Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans 1,082,124 1,011,423
Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans 307,215 301,378
Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans 307,215 301,378
Consumer    
Accounts, Notes, Loans and Financing Receivable    
Loans 95,867 102,482
Pass    
Accounts, Notes, Loans and Financing Receivable    
Loans 1,996,018 1,908,233
Pass | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans 528,747 513,994
Pass | Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans 1,067,426 993,645
Pass | Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans 304,238 298,449
Pass | Consumer    
Accounts, Notes, Loans and Financing Receivable    
Loans 95,607 102,145
Special Mention    
Accounts, Notes, Loans and Financing Receivable    
Loans 8,932 6,942
Special Mention | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans 3,776 3,837
Special Mention | Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans 5,156 2,508
Special Mention | Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans   597
Substandard    
Accounts, Notes, Loans and Financing Receivable    
Loans 18,205 23,065
Substandard | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans 5,426 5,126
Substandard | Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans 9,542 15,270
Substandard | Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans 2,977 2,332
Substandard | Consumer    
Accounts, Notes, Loans and Financing Receivable    
Loans $ 260 $ 337