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Investment Securities - Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 17,933 | $ 93,280
12 months or more | 174,791 | 114,649
Total | 192,724 | 207,929
Unrealized Losses |  |
Less than 12 months | (80) | (785)
12 months or more | (4,416) | (2,537)
Total | (4,496) | (3,322)
U.S. Treasury |  |
Fair Value |  |
Less than 12 months | 0 | 1,967
12 months or more | 1,952 | 0
Total | 1,952 | 1,967
Unrealized Losses |  |
Less than 12 months | 0 | (13)
12 months or more | (32) | 0
Total | (32) | (13)
U.S. government and federal agency obligations |  |
Fair Value |  |
Less than 12 months | 0 | 0
12 months or more | 9,966 | 12,073
Total | 9,966 | 12,073
Unrealized Losses |  |
Less than 12 months | 0 | 0
12 months or more | (269) | (268)
Total | (269) | (268)
Government sponsored enterprises |  |
Fair Value |  |
Less than 12 months | 1,997 | 16,471
12 months or more | 33,346 | 20,426
Total | 35,343 | 36,897
Unrealized Losses |  |
Less than 12 months | (3) | (119)
12 months or more | (469) | (305)
Total | (472) | (424)
Obligations of states and political subdivisions |  |
Fair Value |  |
Less than 12 months | 5,851 | 22,013
12 months or more | 28,832 | 12,570
Total | 34,683 | 34,583
Unrealized Losses |  |
Less than 12 months | (16) | (165)
12 months or more | (485) | (312)
Total | (501) | (477)
Mortgage-backed securities |  |
Fair Value |  |
Less than 12 months | 10,085 | 52,829
12 months or more | 99,321 | 69,580
Total | 109,406 | 122,409
Unrealized Losses |  |
Less than 12 months | (61) | (488)
12 months or more | (3,049) | (1,652)
Total | (3,110) | $ (2,140)
Bank issued trust preferred securities |  |
Fair Value |  |
Less than 12 months | 0 |
12 months or more | 1,374 |
Total | 1,374 |
Unrealized Losses |  |
Less than 12 months | 0 |
12 months or more | (112) |
Total | $ (112) |

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