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Investment Securities Continuous Unrealized Loss (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair value, less than 12 months | $ 67,857 |  | $ 80,425
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate loss accumulated in investments | (406) |  | (442)
Fair value, 12 months or more | 67,129 |  | 64,319
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss, accumulated in investments | (472) |  | (536)
Total fair value | 134,986 |  | 144,744
Available-for-sale securities, continuous unrealized loss position,aggregate loss, accumulated in investments | (878) |  | (978)
Other than temporary impairment losses | 0 | $ 0 |
Corporate bonds [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair value, less than 12 months | 2,221 |  | 8,739
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate loss accumulated in investments | (3) |  | (7)
Fair value, 12 months or more | 3,999 |  | 1,999
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss, accumulated in investments | (3) |  | 0
Total fair value | 6,220 |  | 10,738
Available-for-sale securities, continuous unrealized loss position,aggregate loss, accumulated in investments | (6) |  | (7)
Commercial paper [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair value, less than 12 months |  |  | 2,672
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate loss accumulated in investments |  |  | (1)
Fair value, 12 months or more |  |  | 0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss, accumulated in investments |  |  | 0
Total fair value |  |  | 2,672
Available-for-sale securities, continuous unrealized loss position,aggregate loss, accumulated in investments |  |  | (1)
US treasury notes [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair value, less than 12 months | 21,132 |  | 16,211
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate loss accumulated in investments | (52) |  | (41)
Fair value, 12 months or more | 0 |  | 0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss, accumulated in investments | 0 |  | 0
Total fair value | 21,132 |  | 16,211
Available-for-sale securities, continuous unrealized loss position,aggregate loss, accumulated in investments | (52) |  | (41)
Agencies securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair value, less than 12 months |  |  | 4,002
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate loss accumulated in investments |  |  | (1)
Fair value, 12 months or more |  |  | 0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss, accumulated in investments |  |  | 0
Total fair value |  |  | 4,002
Available-for-sale securities, continuous unrealized loss position,aggregate loss, accumulated in investments |  |  | (1)
Mortgage-backed securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair value, less than 12 months | 19,346 |  | 23,300
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate loss accumulated in investments | (213) |  | (236)
Fair value, 12 months or more | 62,309 |  | 61,383
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss, accumulated in investments | (452) |  | (505)
Total fair value | 81,655 |  | 84,683
Available-for-sale securities, continuous unrealized loss position,aggregate loss, accumulated in investments | (665) |  | (741)
Municipal bonds [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair value, less than 12 months | 0 |  | 0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate loss accumulated in investments | 0 |  | 0
Fair value, 12 months or more | 821 |  | 937
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss, accumulated in investments | (17) |  | (31)
Total fair value | 821 |  | 937
Available-for-sale securities, continuous unrealized loss position,aggregate loss, accumulated in investments | (17) |  | (31)
Asset-backed securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair value, less than 12 months | 25,158 |  | 25,501
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate loss accumulated in investments | (138) |  | (156)
Fair value, 12 months or more | 0 |  | 0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss, accumulated in investments | 0 |  | 0
Total fair value | 25,158 |  | 25,501
Available-for-sale securities, continuous unrealized loss position,aggregate loss, accumulated in investments | $ (138) |  | $ (156)

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