Loans - Summary of the Loan Portfolio by Loan Type and Credit Quality Classification (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Loans
Total	$ 1,956,948	$ 1,583,177
Lending relationship loans	22,874	12,500
Nonclassified
Loans
Total	1,924,684	1,558,105
Classified
Loans
Total	32,264	25,072
Commercial
Loans
Total	609,468	573,296
Commercial | Nonclassified
Loans
Total	583,809	554,913
Commercial | Classified
Loans
Total	25,659	18,383
Real estate
Loans
Total	1,335,420	997,486
Consumer
Loans
Total	12,060	12,395
Consumer | Nonclassified
Loans
Total	12,060	12,394
Consumer | Classified
Loans
Total		1
Commercial | Real estate
Loans
Total	1,030,884	772,867
CRE | Real estate
Loans
Total	1,030,884	772,867
CRE | Real estate | Nonclassified
Loans
Total	1,024,855	766,988
CRE | Real estate | Classified
Loans
Total	6,029	5,879
Land and construction | Real estate
Loans
Total	128,891	100,882
Land and construction | Real estate | Nonclassified
Loans
Total	128,891	100,763
Land and construction | Real estate | Classified
Loans
Total		119
Home equity | Real estate
Loans
Total	121,278	79,176
Home equity | Real estate | Nonclassified
Loans
Total	120,702	78,486
Home equity | Real estate | Classified
Loans
Total	576	690
Residential mortgages | Real estate
Loans
Total	54,367	44,561
Residential mortgages | Real estate | Nonclassified
Loans
Total	$ 54,367	$ 44,561