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Securities - Securities in Unrealized Loss Positions (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Estimated Fair Value |  |
Less than 12 months | $ 11,330 | $ 7,640
12 months or more | 1,621 | 812
Total | 12,951 | 8,452
Gross Unrealized Losses |  |
Less than 12 months | (360) | (31)
12 months or more | (76) | (17)
Total | (436) | (48)
Federal agency mortgage-backed securities |  |
Estimated Fair Value |  |
Less than 12 months | 6,078 | 4,130
12 months or more | 1,621 | 812
Total | 7,699 | 4,942
Gross Unrealized Losses |  |
Less than 12 months | (185) | (20)
12 months or more | (76) | (17)
Total | (261) | (37)
Federal agency debt |  |
Estimated Fair Value |  |
Less than 12 months | 5,252 | 3,510
Total | 5,252 | 3,510
Gross Unrealized Losses |  |
Less than 12 months | (175) | (11)
Total | $ (175) | $ (11)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References No definition available. + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position. + References No definition available. + Details
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