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Investment Securities - Summary of Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity - (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule Of Available For Sale Securities [Line Items]
Available for sale, Amortized Cost	$ 55,928	$ 39,730
Available for sale, Gross Unrealized Gains	247	59
Available for sale, Gross Unrealized Losses	(478)	(512)
Available for sale, Fair Value	55,697	39,277
Held to maturity, Amortized Cost	5,191	6,214
Held to maturity, Gross Unrealized Gains	294	339
Securities held to maturity, fair value	5,485	6,553
Municipal Taxable Securities
Schedule Of Available For Sale Securities [Line Items]
Held to maturity, Amortized Cost	4,296	5,301
Held to maturity, Gross Unrealized Gains	278	328
Securities held to maturity, fair value	4,574	5,629
Municipal Securities
Schedule Of Available For Sale Securities [Line Items]
Held to maturity, Amortized Cost	895	913
Held to maturity, Gross Unrealized Gains	16	11
Securities held to maturity, fair value	911	924
Government Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Available for sale, Amortized Cost	5,057	5,453
Available for sale, Gross Unrealized Losses	(100)	(136)
Available for sale, Fair Value	4,957	5,317
Government Sponsored Agencies
Schedule Of Available For Sale Securities [Line Items]
Available for sale, Amortized Cost	33,530	23,913
Available for sale, Gross Unrealized Gains	44	38
Available for sale, Gross Unrealized Losses	(318)	(311)
Available for sale, Fair Value	33,256	23,640
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Available for sale, Amortized Cost	17,341	10,364
Available for sale, Gross Unrealized Gains	203	21
Available for sale, Gross Unrealized Losses	(60)	(65)
Available for sale, Fair Value	$ 17,484	$ 10,320

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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