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
	Mar. 31, 2019	Mar. 31, 2018
Available for Sale Securities
Balance at beginning of the period	$ 3,328	$ 3,978
Included in other comprehensive income	43	(25)
Principal payments	(435)	13
Ending balance	$ 2,936	$ 3,966