Other Real Estate Assets Owned (OREO) - Narrative (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) loan	Dec. 31, 2014 USD ($)
Other Real Estate [Abstract]
Other real estate	$ 3,387,000		$ 3,387,000		$ 3,345,000	$ 4,051,000
Expenses (income) applicable to OREO	183,000	$ 193,000	339,000	$ 285,000
Consumer mortgage loans, secured by residential real estate, foreclosure in process	$ 0		$ 0		$ 533,000
Consumer mortgage loans, secured by residential real estate, foreclosure in process, number of loans | loan					1