Loans - Aging of Past Due Loans by Class of Loans - Tabular Disclosure (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Aging of Past Due Loans by Class of Loans
Total Past Due	$ 15,315	$ 8,873
Loans Not Past Due	2,518,848	1,877,859
Total loan balance	2,534,163	1,886,732
30-59 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	4,770	5,699
60-89 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	2,234	1,916
90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	8,311	1,258
Commercial
Aging of Past Due Loans by Class of Loans
Total Past Due	10,084
Loans Not Past Due	621,463
Total loan balance	631,547	597,763
Commercial | 30-59 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	4,770
Commercial | 60-89 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	2,097
Commercial | 90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	3,217
Real estate
Aging of Past Due Loans by Class of Loans
Total loan balance	1,882,734	1,276,516
Consumer
Aging of Past Due Loans by Class of Loans
Total Past Due		1
Loans Not Past Due	19,882	12,452
Total loan balance	19,882	12,453
Consumer | 30-59 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due		1
Commercial
Aging of Past Due Loans by Class of Loans
Total Past Due		8,872
Loans Not Past Due		588,891
Total loan balance		597,763
Commercial | 30-59 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due		5,698
Commercial | 60-89 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due		1,916
Commercial | 90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due		1,258
CRE | Real estate
Aging of Past Due Loans by Class of Loans
Total Past Due	5,094
Loans Not Past Due	1,505,498	994,067
Total loan balance	1,510,592	994,067
CRE | Real estate | 90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	5,094
Land and construction | Real estate
Aging of Past Due Loans by Class of Loans
Loans Not Past Due	150,634	122,358
Total loan balance	150,634	122,358
Home equity | Real estate
Aging of Past Due Loans by Class of Loans
Total Past Due	137
Loans Not Past Due	175,115	109,112
Total loan balance	175,252	109,112
Home equity | Real estate | 60-89 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	137
Residential mortgages | Real estate
Aging of Past Due Loans by Class of Loans
Loans Not Past Due	46,256	50,979
Total loan balance	$ 46,256	$ 50,979