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Securities - (Details 4) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) security | Dec. 31, 2016 USD ($) security
Held to Maturity: |  |
Number of positions, less than 12 months (securities) | security | 21 | 106
Number of positions, 12 months or more (securities) | security | 2 | 0
Number of positions (securities) | security | 23 | 106
Fair value, less than 12 months | $ 23,871 | $ 95,277
Fair value, 12 months or more | 523 | 0
Fair value | 24,394 | 95,277
Unrealized losses, less than 12 months | (213) | (1,965)
Unrealized losses, 12 months or more | (5) | 0
Unrealized losses | $ (218) | $ (1,965)
Available for Sale: |  |
Number of positions, less than 12 months (securities) | security | 123 | 184
Number of positions, 12 months or more (securities) | security | 30 | 26
Number of positions (securities) | security | 153 | 210
Fair value, less than 12 months | $ 321,995 | $ 427,364
Fair value, 12 months or more | 72,204 | 67,255
Fair value | 394,199 | 494,619
Unrealized losses, less than 12 months | (2,998) | (8,564)
Unrealized losses, 12 months or more | (6,230) | (7,501)
Unrealized losses | $ (9,228) | $ (16,065)
Trust preferred securities |  |
Available for Sale: |  |
Number of positions, less than 12 months (securities) | security | 0 | 0
Number of positions, 12 months or more (securities) | security | 3 | 3
Number of positions (securities) | security | 3 | 3
Fair value, less than 12 months | $ 0 | $ 0
Fair value, 12 months or more | 16,992 | 18,389
Fair value | 16,992 | 18,389
Unrealized losses, less than 12 months | 0 | 0
Unrealized losses, 12 months or more | (4,801) | (5,360)
Unrealized losses | $ (4,801) | $ (5,360)
Other debt securities |  |
Available for Sale: |  |
Number of positions, less than 12 months (securities) | security | 2 | 3
Number of positions, 12 months or more (securities) | security | 1 | 2
Number of positions (securities) | security | 3 | 5
Fair value, less than 12 months | $ 6,658 | $ 7,946
Fair value, 12 months or more | 1,205 | 2,475
Fair value | 7,863 | 10,421
Unrealized losses, less than 12 months | (38) | (208)
Unrealized losses, 12 months or more | (7) | (10)
Unrealized losses | $ (45) | $ (218)
Obligations of other U.S. Government agencies and corporations |  |
Held to Maturity: |  |
Number of positions, less than 12 months (securities) | security | 4 | 4
Number of positions, 12 months or more (securities) | security | 0 | 0
Number of positions (securities) | security | 4 | 4
Fair value, less than 12 months | $ 12,025 | $ 11,915
Fair value, 12 months or more | 0 | 0
Fair value | 12,025 | 11,915
Unrealized losses, less than 12 months | (77) | (187)
Unrealized losses, 12 months or more | 0 | 0
Unrealized losses | $ (77) | $ (187)
Available for Sale: |  |
Number of positions, less than 12 months (securities) | security | 0 | 0
Number of positions, 12 months or more (securities) | security | 0 | 0
Number of positions (securities) | security | 0 | 0
Fair value, less than 12 months | $ 0 | $ 0
Fair value, 12 months or more | 0 | 0
Fair value | 0 | 0
Unrealized losses, less than 12 months | 0 | 0
Unrealized losses, 12 months or more | 0 | 0
Unrealized losses | $ 0 | $ 0
Obligations of states and political subdivisions |  |
Held to Maturity: |  |
Number of positions, less than 12 months (securities) | security | 17 | 102
Number of positions, 12 months or more (securities) | security | 2 | 0
Number of positions (securities) | security | 19 | 102
Fair value, less than 12 months | $ 11,846 | $ 83,362
Fair value, 12 months or more | 523 | 0
Fair value | 12,369 | 83,362
Unrealized losses, less than 12 months | (136) | (1,778)
Unrealized losses, 12 months or more | (5) | 0
Unrealized losses | $ (141) | $ (1,778)
Government agency mortgage backed securities | Residential mortgage-backed securities |  |
Available for Sale: |  |
Number of positions, less than 12 months (securities) | security | 89 | 131
Number of positions, 12 months or more (securities) | security | 8 | 5
Number of positions (securities) | security | 97 | 136
Fair value, less than 12 months | $ 213,161 | $ 298,400
Fair value, 12 months or more | 16,818 | 11,504
Fair value | 229,979 | 309,904
Unrealized losses, less than 12 months | (1,911) | (6,042)
Unrealized losses, 12 months or more | (377) | (601)
Unrealized losses | $ (2,288) | $ (6,643)
Government agency mortgage backed securities | Commercial mortgage-backed securities |  |
Available for Sale: |  |
Number of positions, less than 12 months (securities) | security | 3 | 9
Number of positions, 12 months or more (securities) | security | 2 | 2
Number of positions (securities) | security | 5 | 11
Fair value, less than 12 months | $ 7,862 | $ 21,933
Fair value, 12 months or more | 1,082 | 1,101
Fair value | 8,944 | 23,034
Unrealized losses, less than 12 months | (138) | (453)
Unrealized losses, 12 months or more | (8) | (8)
Unrealized losses | $ (146) | $ (461)
Government agency collateralized mortgage obligations | Residential mortgage-backed securities |  |
Available for Sale: |  |
Number of positions, less than 12 months (securities) | security | 29 | 40
Number of positions, 12 months or more (securities) | security | 16 | 14
Number of positions (securities) | security | 45 | 54
Fair value, less than 12 months | $ 94,314 | $ 97,356
Fair value, 12 months or more | 36,107 | 33,786
Fair value | 130,421 | 131,142
Unrealized losses, less than 12 months | (911) | (1,845)
Unrealized losses, 12 months or more | (1,037) | (1,522)
Unrealized losses | $ (1,948) | $ (3,367)
Government agency collateralized mortgage obligations | Commercial mortgage-backed securities |  |
Available for Sale: |  |
Number of positions, less than 12 months (securities) | security | 0 | 1
Number of positions, 12 months or more (securities) | security | 0 | 0
Number of positions (securities) | security | 0 | 1
Fair value, less than 12 months | $ 0 | $ 1,729
Fair value, 12 months or more | 0 | 0
Fair value | 0 | 1,729
Unrealized losses, less than 12 months | 0 | (16)
Unrealized losses, 12 months or more | 0 | 0
Unrealized losses | $ 0 | $ (16)

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