Disclosures About Fair Value of Assets and Liabilities - Reconciliation of Beginning and Ending Balances of Recurring Fair Value Measurements using Significant Unobservable Level 3 Inputs (Details) - Fair Value, Measurements, Recurring - Available for Sale Securities - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Available for Sale Securities
Balance at beginning of the period	$ 3,330	$ 5,564	$ 5,169	$ 5,932
Included in other comprehensive income	(22)	(45)	38	52
Principal payments	679	(77)	(1,220)	(542)
Ending balance	$ 3,987	$ 5,442	$ 3,987	$ 5,442