Borrowing Arrangements - Subordinated Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Sep. 30, 2013
Subordinated debentures
Subordinated Debt
Period of interest payment deferment	5 years
Junior subordinated debentures | Floating Rate Junior Subordinated Debentures due July 31, 2031 | Heritage Statutory Trust II
Subordinated Debt
Floating rate subordinated debt, redemption amount		$ 5,000
Junior subordinated debentures | Floating Rate Junior Subordinated Debentures due September 26, 2032 | Heritage Statutory Trust III
Subordinated Debt
Floating rate subordinated debt, redemption amount		$ 4,000