Securities (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) security	Dec. 31, 2016 USD ($) security	Dec. 31, 2015 USD ($) security
Schedule of Trading Securities and Other Trading Assets [Line Items]
Asset-backed securities pledged to secure certain deposits	$ 31,500	$ 21,500
Asset-backed securities pledged as collateral	4,000	1,600
Amount	162,987	157,830
Amortized cost, available for sale	69,928	54,565
Gain (Loss) On Sale Of Securities, Net	175	31	$ 4
Securities held to maturity (HTM), at amortized cost	99,246	109,247
Securities available for sale (AFS), at fair value	68,285	53,033
Estimated Fair Value, held to maturity	98,007	108,034
Gross unrealized losses, available for sale	1,682	1,577
Held-To-Maturity Securities, Continuous Unrealized Loss Position, Fair Value	82,325	85,022
Gross unrealized losses, held to maturity	1,436	1,715
Three Available For Sale Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Gross realized gains on sale of AFS securities	9
Securities available for sale (AFS), at fair value	$ 3,700
Number Of Available For Sale Securities Sold | security	3
Five Available For Sale Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Gross realized gains on sale of AFS securities		23
Securities available for sale (AFS), at fair value		$ 6,500
Number Of Available For Sale Securities Sold | security		5
An Available For Sale Security Agency Bond [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Gross realized gains on sale of AFS securities			5
Securities available for sale (AFS), at fair value			2,000
One Held To Maturity Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Gross realized gains on sale of HTM securities		$ 8	(1)
Securities held to maturity (HTM), at amortized cost		$ 698	$ 67
Number Of Held To Maturity Securities Sold | security		1	1
Nine Held To Maturity Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Gross realized gains on sale of HTM securities	$ 166
Securities held to maturity (HTM), at amortized cost	$ 4,800
Number Of Held To Maturity Securities Sold | security	9
Residential Mortgage Backed Securities Issued By US Government Sponsored Enterprises [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized cost, available for sale	$ 7,265	$ 4,377
Securities held to maturity (HTM), at amortized cost	29,113	34,735
Securities available for sale (AFS), at fair value	7,087	4,183
Estimated Fair Value, held to maturity	28,987	34,533
Gross unrealized losses, available for sale	178	194
Gross unrealized losses, held to maturity	261	569
Residential Collateralized Mortgage Obligations, Issued By US Government Sponsored Enterprises [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized cost, available for sale	45,283	35,176
Securities held to maturity (HTM), at amortized cost	54,805	63,060
Securities available for sale (AFS), at fair value	44,137	34,228
Estimated Fair Value, held to maturity	54,022	62,393
Gross unrealized losses, available for sale	1,158	966
Gross unrealized losses, held to maturity	845	802
Asset-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	62,999	46,108
Held-To-Maturity Securities, Continuous Unrealized Loss Position, Fair Value	$ 81,726	$ 84,219
Asset-backed Securities, Issued by Private Enterprises [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Held to maturity securities with unrealized losses, average life	3 years 2 months 12 days	4 years 1 month 24 days
Held to maturity securities with unrealized losses, average duration	2 years 7 months 28 days	3 years 3 months 15 days
Securities held to maturity (HTM), at amortized cost	$ 651	$ 884
Held-To-Maturity Securities, Continuous Unrealized Loss Position, Fair Value	$ 599	$ 803
Asset-backed securities issued by GSEs [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available for sale securities, average life	4 years 8 months 27 days	4 years 11 months 16 days
Available for sale securities, average duration	4 years 2 months 19 days	4 years 5 months 5 days
Held to maturity securities, average life	4 years 11 months 12 days	5 years 3 months 18 days
Held to maturity securities, average duration	4 years 4 months 21 days	4 years 8 months 16 days
Available for sale securities with unrealized losses, average life	4 years 8 months 16 days	4 years 10 months 28 days
Available for sale securities with unrealized losses, average duration	4 years 2 months 12 days	4 years 4 months 13 days
Held to maturity securities with unrealized losses, average life	5 years 7 days	5 years 22 days
Held to maturity securities with unrealized losses, average duration	4 years 5 months 5 days	4 years 5 months 27 days
Amortized cost, available for sale	$ 65,400	$ 50,100
Securities held to maturity (HTM), at amortized cost	98,600	108,400
Residential Collateralized Mortgage Obligations, Issued By Private Enterprises [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities held to maturity (HTM), at amortized cost	651	884
Estimated Fair Value, held to maturity	599	803
Gross unrealized losses, held to maturity	52	81
Corporate Equity Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized cost, available for sale	37	37
Securities available for sale (AFS), at fair value	37	37
Bond Mutual Funds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized cost, available for sale	4,480	4,386
Securities available for sale (AFS), at fair value	4,507	4,413
US Government Obligations [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities held to maturity (HTM), at amortized cost	1,000	850
Estimated Fair Value, held to maturity	$ 1,000	$ 850
Standard Poor's, AAA Rating [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Percentage of asset backed securities in investment portfolio	99.00%	99.00%
Amount	$ 162,336	$ 156,947
Standard Poor's, BB Rating [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amount	651	411
Standard Poor's, B+ Rating [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amount		$ 472