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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

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- Definition 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 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity 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 This item represents the cost of debt and equity 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 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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