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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
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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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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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