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Loans and allowance for loan losses- Loans Outstanding by Major Lending Classification (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Gross loans $ 4,289,516   $ 3,667,511      
Less: Allowance for loan losses (30,138) $ (29,814) (28,932) $ (26,347) $ (24,406) $ (24,041)
Net loans 4,259,378   3,638,579      
Commercial and industrial            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Gross loans 989,288   867,083      
Less: Allowance for loan losses (4,923) (5,514) (5,348) (4,747) (4,578) (4,461)
Construction            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Gross loans 525,954   556,051      
Less: Allowance for loan losses (9,655) (9,758) (9,729) (9,023) (7,866) (7,135)
Residential real estate: | 1-to-4 family mortgage            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Gross loans 688,984   555,815      
Less: Allowance for loan losses (3,288) (3,295) (3,428) (3,378) (3,122) (3,197)
Residential real estate: | Residential line of credit            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Gross loans 218,006   190,480      
Less: Allowance for loan losses (755) (731) (811) (795) (1,165) (944)
Residential real estate: | Multi-family mortgage            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Gross loans 82,945   75,457      
Less: Allowance for loan losses (617) (539) (566) (391) (449) (434)
Commercial real estate: | Owner occupied            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Gross loans 602,723   493,524      
Less: Allowance for loan losses (3,512) (3,098) (3,132) (3,290) (3,014) (3,558)
Commercial real estate: | Non-owner occupied            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Gross loans 922,150   700,248      
Less: Allowance for loan losses (4,478) (4,583) (4,149) (3,272) (2,753) (2,817)
Consumer and other            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Gross loans 259,466   228,853      
Less: Allowance for loan losses $ (2,910) $ (2,296) $ (1,769) $ (1,451) $ (1,459) $ (1,495)