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Investment Securities Gross Gains and Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost basis | $ 184,475 | $ 209,146
Gross unrealized gains | 212 | 258
Gross unrealized losses | (878) | (978)
Fair value | 183,809 | 208,426
Corporate bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost basis | 12,060 | 21,533
Gross unrealized gains | 5 | 9
Gross unrealized losses | (6) | (7)
Fair value | 12,059 | 21,535
Commercial paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost basis | 3,885 | 12,427
Gross unrealized gains | 0 | 4
Gross unrealized losses | 0 | (1)
Fair value | 3,885 | 12,430
US treasury notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost basis | 25,888 | 21,603
Gross unrealized gains | 1 | 1
Gross unrealized losses | (52) | (41)
Fair value | 25,837 | 21,563
Agencies securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost basis |  | 4,002
Gross unrealized gains |  | 0
Gross unrealized losses |  | (1)
Fair value |  | 4,001
Mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost basis | 112,838 | 117,990
Gross unrealized gains | 204 | 242
Gross unrealized losses | (665) | (741)
Fair value | 112,377 | 117,491
Municipal bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost basis | 1,304 | 1,460
Gross unrealized gains | 1 | 1
Gross unrealized losses | (17) | (31)
Fair value | 1,288 | 1,430
Asset-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost basis | 28,500 | 30,131
Gross unrealized gains | 1 | 1
Gross unrealized losses | (138) | (156)
Fair value | $ 28,363 | $ 29,976

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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=65884222&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=73527792&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=66010992&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=73527792&loc=d3e27161-111563 + Details
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