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Securities Securities (Unrealized Losses Held-to-Maturity) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair value |  |
Less than 12 months | $ 7,591 | $ 22,134
12 months or longer | 11,962 | 0
Total | 19,553 | 22,134
Unrealized losses |  |
Less than 12 months | 78 | 179
12 months or longer | 181 | 0
Total | 259 | 179
U.S. government agency obligations - government-sponsored enterprises |  |
Fair value |  |
Less than 12 months | 0 | 1,000
12 months or longer | 1,499 | 0
Total | 1,499 | 1,000
Unrealized losses |  |
Less than 12 months | 0 | 5
12 months or longer | 9 | 0
Total | 9 | 5
Municipal obligations |  |
Fair value |  |
Less than 12 months | 3,723 | 9,472
12 months or longer | 259 | 0
Total | 3,982 | 9,472
Unrealized losses |  |
Less than 12 months | 27 | 78
12 months or longer | 7 | 0
Total | 34 | 78
Collateralized mortgage obligations - government issued |  |
Fair value |  |
Less than 12 months | 3,868 | 6,980
12 months or longer | 4,677 | 0
Total | 8,545 | 6,980
Unrealized losses |  |
Less than 12 months | 51 | 38
12 months or longer | 79 | 0
Total | 130 | 38
Collateralized mortgage obligations - government-sponsored enterprises |  |
Fair value |  |
Less than 12 months | 0 | 4,682
12 months or longer | 5,527 | 0
Total | 5,527 | 4,682
Unrealized losses |  |
Less than 12 months | 0 | 58
12 months or longer | 86 | 0
Total | $ 86 | $ 58

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