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Securities (Unrealized Losses Held-to-Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 21,546 | $ 7,591
12 months or longer | 11,386 | 11,962
Total | 32,932 | 19,553
Unrealized Losses |  |
Less than 12 months | 233 | 78
12 months or longer | 306 | 181
Total | 539 | 259
U.S. government agency obligations - government-sponsored enterprises |  |
Fair Value |  |
Less than 12 months | 0 | 0
12 months or longer | 1,499 | 1,499
Total | 1,499 | 1,499
Unrealized Losses |  |
Less than 12 months | 0 | 0
12 months or longer | 9 | 9
Total | 9 | 9
Municipal obligations |  |
Fair Value |  |
Less than 12 months | 14,446 | 3,723
12 months or longer | 258 | 259
Total | 14,704 | 3,982
Unrealized Losses |  |
Less than 12 months | 120 | 27
12 months or longer | 9 | 7
Total | 129 | 34
Collateralized mortgage obligations - government issued |  |
Fair Value |  |
Less than 12 months | 4,225 | 3,868
12 months or longer | 4,388 | 4,677
Total | 8,613 | 8,545
Unrealized Losses |  |
Less than 12 months | 106 | 51
12 months or longer | 126 | 79
Total | 232 | 130
Collateralized mortgage obligations - government-sponsored enterprises |  |
Fair Value |  |
Less than 12 months | 2,875 | 0
12 months or longer | 5,241 | 5,527
Total | 8,116 | 5,527
Unrealized Losses |  |
Less than 12 months | 7 | 0
12 months or longer | 162 | 86
Total | $ 169 | $ 86

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