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Investment Securities and Fair Value Measurements - Sales, Calls and Maturities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross Realized Gains |  |  | $ 1 | $ 6
Gross Realized Losses |  |  | 0 | 0
Gross Proceeds from Sales |  |  | 15 | 10,016
Gross Proceeds from Maturities |  |  | 10,974 | 17,112
Accretion (amortization) of discounts and premiums | $ 200 | $ 100 | 500 | 300
Agency securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross Realized Gains |  |  | 1 | 5
Gross Realized Losses |  |  | 0 | 0
Gross Proceeds from Sales |  |  | 15 | 3,005
Gross Proceeds from Maturities |  |  | 1,044 | 9,557
Corporate bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross Realized Gains |  |  | 0 | 1
Gross Realized Losses |  |  | 0 | 0
Gross Proceeds from Sales |  |  | 0 | 5,011
Gross Proceeds from Maturities |  |  | 7,440 | 2,480
Treasury bills |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross Realized Gains |  |  |  | 0
Gross Realized Losses |  |  |  | 0
Gross Proceeds from Sales |  |  |  | 2,000
Gross Proceeds from Maturities |  |  |  | 3,830
Certificates of deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross Realized Gains |  |  | 0 | 0
Gross Realized Losses |  |  | 0 | 0
Gross Proceeds from Sales |  |  | 0 | 0
Gross Proceeds from Maturities |  |  | $ 2,490 | $ 1,245

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- Definition The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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- Definition The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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