Securities (Narrative) (Details) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($) security	Dec. 31, 2017 USD ($) security
Schedule of Trading Securities and Other Trading Assets [Line Items]
Asset-backed securities pledged to secure certain deposits	$ 42,600		$ 31,500
Asset-backed securities pledged as collateral	3,500		4,000
Amount	205,179		162,987
Amortized cost, available for sale	111,595		69,808
Gain (Loss) On Sale Of Securities, Net		$ 133	175
Gross realized gains (loss) on sale of HTM securities		133
Securities held to maturity (HTM), at amortized cost	97,217		99,246
Securities available for sale (AFS), at fair value	107,962		68,164
Estimated Fair Value, held to maturity	93,811		98,007
Gross unrealized losses, available for sale	3,645		1,682
Gross unrealized losses, held to maturity	3,569		1,436
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	$ 9
Number Of Available For Sale Securities Sold | security		3	3
Securities available for sale (AFS), at fair value		$ 3,600	$ 3,700
Six Held To Maturity Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Gross realized gains (loss) on sale of HTM securities		$ 124
Number Of Held To Maturity Securities Sold | security		6
Securities held to maturity (HTM), at amortized cost		$ 3,400
Nine Held To Maturity Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Gross realized gains (loss) on sale of HTM securities			$ 166
Number Of Held To Maturity Securities Sold | security			9
Securities held to maturity (HTM), at amortized cost			$ 4,800
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	6,705		7,265
Securities held to maturity (HTM), at amortized cost	26,728		29,113
Securities available for sale (AFS), at fair value	6,349		7,087
Estimated Fair Value, held to maturity	25,703		28,987
Gross unrealized losses, available for sale	356		178
Gross unrealized losses, held to maturity	1,108		261
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	92,042		45,283
Securities held to maturity (HTM), at amortized cost	52,087		54,805
Securities available for sale (AFS), at fair value	89,432		44,137
Estimated Fair Value, held to maturity	50,441		54,022
Gross unrealized losses, available for sale	2,622		1,158
Gross unrealized losses, held to maturity	$ 1,726		$ 845
Asset-backed Securities, Issued by US Government Sponsored Enterprises and U.S. Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available for sale securities, average life	4 years 9 months 15 days		4 years 8 months 27 days
Available for sale securities, average duration	4 years 1 month 28 days		4 years 2 months 19 days
Held to maturity securities, average life	5 years 3 months 18 days		4 years 11 months 12 days
Held to maturity securities, average duration	4 years 6 months 26 days		4 years 4 months 21 days
Available for sale securities with unrealized losses, average life	4 years 8 months 16 days		4 years 8 months 16 days
Available for sale securities with unrealized losses, average duration	4 years 1 month 6 days		4 years 2 months 12 days
Held to maturity securities with unrealized losses, average life			5 years 7 days
Held to maturity securities with unrealized losses, average duration			4 years 5 months 5 days
Securities held to maturity (HTM), at amortized cost			$ 81,700
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	2 years 9 months 29 days		3 years 2 months 12 days
Held to maturity securities with unrealized losses, average duration	2 years 3 months 11 days		2 years 7 months 28 days
Securities held to maturity (HTM), at amortized cost	$ 481		$ 599
US Government Agencies Callable Agency Bonds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities held to maturity (HTM), at amortized cost	5,011		5,017
Estimated Fair Value, held to maturity	4,811		4,974
Gross unrealized losses, held to maturity	200		43
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	522		651
Estimated Fair Value, held to maturity	481		599
Gross unrealized losses, held to maturity	41		52
Bond Mutual Funds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized cost, available for sale			4,397
Securities available for sale (AFS), at fair value			4,423
US Government Obligations [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities held to maturity (HTM), at amortized cost	994		1,000
Estimated Fair Value, held to maturity	993		$ 1,000
Gross unrealized losses, held to maturity	$ 1
Asset-backed Securities Or Bonds, Issued by US Government Sponsored Enterprises [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Held to maturity securities with unrealized losses, average life	5 years 11 days
Held to maturity securities with unrealized losses, average duration	4 years 4 months 10 days
Securities held to maturity (HTM), at amortized cost	$ 83,000
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	$ 204,657		$ 162,336
Standard Poor's, BB Rating [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amount	$ 522		$ 651