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Investment Securities Gross Gains and Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized cost basis	$ 192,662	$ 154,652
Gross unrealized gains	32	56
Gross unrealized losses	(1,664)	(1,199)
Fair value	191,030	153,509
Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost basis	20,000
Gross unrealized gains	0
Gross unrealized losses	0
Fair value	20,000
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost basis		1,000
Gross unrealized gains		0
Gross unrealized losses		0
Fair value		1,000
US treasury notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost basis		10,921
Gross unrealized gains		0
Gross unrealized losses		(46)
Fair value		10,875
Agency bond securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost basis	14,952
Gross unrealized gains	0
Gross unrealized losses	(48)
Fair value	14,904
Mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost basis	118,350	121,037
Gross unrealized gains	32	52
Gross unrealized losses	(1,514)	(1,055)
Fair value	116,868	120,034
Municipal bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost basis	604	742
Gross unrealized gains	0	4
Gross unrealized losses	(21)	(7)
Fair value	583	739
Asset-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost basis	38,756	20,952
Gross unrealized gains	0	0
Gross unrealized losses	(81)	(91)
Fair value	$ 38,675	$ 20,861

X

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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