Other Real Estate Owned - Other Real Estate, Roll Forward (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Real Estate [Roll Forward]
Balance at beginning of period	$ 483,000	$ 2,331,000
Market value adjustments	0	(50,000)
Balance at end of period	$ 483,000	$ 2,281,000