Loans - Aging of Past Due Loans by Class of Loans - Tabular Disclosure (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Aging of Past Due Loans by Class of Loans
Total Past Due	$ 5,100	$ 5,754
Loans Not Past Due	1,390,865	1,353,704
Total loan balance	1,395,965	1,359,458
30-59 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	2,907	3,504
60-89 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	1,980	262
90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	213	1,988
Commercial
Aging of Past Due Loans by Class of Loans
Total Past Due	3,702	5,251
Loans Not Past Due	588,426	551,271
Total loan balance	592,128	556,522
Commercial | 30-59 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	2,906	3,285
Commercial | 60-89 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	796	262
Commercial | 90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due		1,704
Real estate
Aging of Past Due Loans by Class of Loans
Total loan balance	787,361	786,926
Consumer
Aging of Past Due Loans by Class of Loans
Loans Not Past Due	16,476	16,010
Total loan balance	16,476	16,010
Commercial and residential | Real estate
Aging of Past Due Loans by Class of Loans
Total Past Due	889
Loans Not Past Due	615,932	625,665
Total loan balance	616,821	625,665
Commercial and residential | Real estate | 60-89 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	889
Land and construction | Real estate
Aging of Past Due Loans by Class of Loans
Total Past Due	213	219
Loans Not Past Due	95,334	84,209
Total loan balance	95,547	84,428
Land and construction | Real estate | 30-59 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due		219
Land and construction | Real estate | 90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	213
Home equity | Real estate
Aging of Past Due Loans by Class of Loans
Total Past Due	296	284
Loans Not Past Due	74,697	76,549
Total loan balance	74,993	76,833
Home equity | Real estate | 30-59 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	1
Home equity | Real estate | 60-89 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	$ 295
Home equity | Real estate | 90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due		$ 284