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Investment Securities - Continuous Unrealized Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Fair value, less than 12 months | $ 107,877 |  | $ 107,877 |  | $ 69,405
Unrealized loss, less than 12 months | (542) |  | (542) |  | (476)
Fair value, 12 months or more | 74,804 |  | 74,804 |  | 69,367
Unrealized loss, 12 months or more | (1,455) |  | (1,455) |  | (723)
Total fair value | 182,681 |  | 182,681 |  | 138,772
Total unrealized loss | (1,997) |  | (1,997) |  | (1,199)
Other than temporary impairment losses | 0 | $ 0 | 0 | $ 0 |
Agency bond securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Fair value, less than 12 months | 19,584 |  | 19,584 |  |
Unrealized loss, less than 12 months | (128) |  | (128) |  |
Fair value, 12 months or more | 0 |  | 0 |  |
Unrealized loss, 12 months or more | 0 |  | 0 |  |
Total fair value | 19,584 |  | 19,584 |  |
Total unrealized loss | (128) |  | (128) |  |
Agency mortgage-backed securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Fair value, less than 12 months | 32,282 |  | 32,282 |  | 62,683
Unrealized loss, less than 12 months | (328) |  | (328) |  | (453)
Fair value, 12 months or more | 65,414 |  | 65,414 |  | 44,159
Unrealized loss, 12 months or more | (1,402) |  | (1,402) |  | (602)
Total fair value | 97,696 |  | 97,696 |  | 106,842
Total unrealized loss | (1,730) |  | (1,730) |  | (1,055)
Municipal bonds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Fair value, less than 12 months | 346 |  | 346 |  | 0
Unrealized loss, less than 12 months | (21) |  | (21) |  | 0
Fair value, 12 months or more | 131 |  | 131 |  | 193
Unrealized loss, 12 months or more | (9) |  | (9) |  | (7)
Total fair value | 477 |  | 477 |  | 193
Total unrealized loss | (30) |  | (30) |  | (7)
Asset-backed securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Fair value, less than 12 months | 55,665 |  | 55,665 |  | 2,134
Unrealized loss, less than 12 months | (65) |  | (65) |  | (2)
Fair value, 12 months or more | 9,259 |  | 9,259 |  | 18,727
Unrealized loss, 12 months or more | (44) |  | (44) |  | (89)
Total fair value | 64,924 |  | 64,924 |  | 20,861
Total unrealized loss | $ (109) |  | $ (109) |  | (91)
U.S. Treasury notes |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Fair value, less than 12 months |  |  |  |  | 4,588
Unrealized loss, less than 12 months |  |  |  |  | (21)
Fair value, 12 months or more |  |  |  |  | 6,288
Unrealized loss, 12 months or more |  |  |  |  | (25)
Total fair value |  |  |  |  | 10,876
Total unrealized loss |  |  |  |  | $ (46)

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