Loans - Aging of Past Due Loans by Class of Loans - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Aging of Past Due Loans by Class of Loans
Past due loans 30 day or greater	$ 5,100	$ 5,754
Nonaccrual	4,184	4,716	$ 6,733
30 days or greater past due
Aging of Past Due Loans by Class of Loans
Past due loans 30 day or greater	509	591
Less than 30 days past due
Aging of Past Due Loans by Class of Loans
Nonaccrual	$ 3,675	$ 4,125