Other Real Estate Owned (Summary of Other Real Estate Owned) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Other Real Estate Owned [Line Items]
Other Real Estate Owned, established through acquisition	$ 10,279	$ 0
Balance, beginning of period	5,998	13,738
Transfers in	106	1,047
Valuation adjustments	(364)	(860)
Proceeds from Sale of Wholly Owned Real Estate and Real Estate Acquired in Settlement of Loans	2,590	8,158
Net realized gain on sale of other real estate owned	(131)	231
Balance, end of period	13,298	$ 5,998
Mortgage Loans in Process of Foreclosure, Amount	302
Real estate: One-to-four family residential [Member]
Other Real Estate Owned [Line Items]
Balance, end of period	$ 74