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Investment Securities Continuous Unrealized Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Fair value, less than 12 months | $ 96,881 |  | $ 96,881 |  | $ 69,405
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (439) |  | (439) |  | (476)
Fair value, 12 months or more | 54,630 |  | 54,630 |  | 69,367
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,225) |  | (1,225) |  | (723)
Total fair value | 151,511 |  | 151,511 |  | 138,772
Available-for-sale securities, continuous unrealized loss position,aggregate loss, accumulated in investments | (1,664) |  | (1,664) |  | (1,199)
Other than temporary impairment losses | 0 | $ 0 | 0 | $ 0 |
Agency bond securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Fair value, less than 12 months | 14,904 |  | 14,904 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (48) |  | (48) |  |
Fair value, 12 months or more | 0 |  | 0 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |  | 0 |  |
Total fair value | 14,904 |  | 14,904 |  |
Available-for-sale securities, continuous unrealized loss position,aggregate loss, accumulated in investments | (48) |  | (48) |  |
Mortgage-backed securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Fair value, less than 12 months | 52,114 |  | 52,114 |  | 62,683
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (366) |  | (366) |  | (453)
Fair value, 12 months or more | 45,236 |  | 45,236 |  | 44,159
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,148) |  | (1,148) |  | (602)
Total fair value | 97,350 |  | 97,350 |  | 106,842
Available-for-sale securities, continuous unrealized loss position,aggregate loss, accumulated in investments | (1,514) |  | (1,514) |  | (1,055)
Municipal bonds [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Fair value, less than 12 months | 427 |  | 427 |  | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (12) |  | (12) |  | 0
Fair value, 12 months or more | 156 |  | 156 |  | 193
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (9) |  | (9) |  | (7)
Total fair value | 583 |  | 583 |  | 193
Available-for-sale securities, continuous unrealized loss position,aggregate loss, accumulated in investments | (21) |  | (21) |  | (7)
Asset-backed securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Fair value, less than 12 months | 29,436 |  | 29,436 |  | 2,134
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (13) |  | (13) |  | (2)
Fair value, 12 months or more | 9,238 |  | 9,238 |  | 18,727
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (68) |  | (68) |  | (89)
Total fair value | 38,674 |  | 38,674 |  | 20,861
Available-for-sale securities, continuous unrealized loss position,aggregate loss, accumulated in investments | $ (81) |  | $ (81) |  | (91)
US treasury notes [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Fair value, less than 12 months |  |  |  |  | 4,588
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  |  |  |  | (21)
Fair value, 12 months or more |  |  |  |  | 6,288
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  |  |  |  | (25)
Total fair value |  |  |  |  | 10,876
Available-for-sale securities, continuous unrealized loss position,aggregate loss, accumulated in investments |  |  |  |  | $ (46)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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