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Securities - Gross Unrealized Losses and Fair Value by Investment Category (Details) $ in Thousands | Sep. 30, 2019 USD ($) security | Dec. 31, 2018 USD ($) security
--- | --- | ---
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 39 | 168
Fair Value, Less than 12 Months | $ 208,700 | $ 509,808
Unrealized Losses, Less than 12 Months | $ (1,503) | $ (5,163)
Number of positions, 12 Months or More | security | 25 | 171
Fair value, 12 Months or More | $ 42,747 | $ 312,698
Unrealized Losses, 12 Months or More | $ (2,634) | $ (13,106)
Number of positions | security | 64 | 339
Fair Value | $ 251,447 | $ 822,506
Unrealized Losses | $ (4,137) | $ (18,269)
Obligations of other U.S. Government agencies and corporations |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 0 | 0
Fair Value, Less than 12 Months | $ 0 | $ 0
Unrealized Losses, Less than 12 Months | $ 0 | $ 0
Number of positions, 12 Months or More | security | 1 | 2
Fair value, 12 Months or More | $ 1,009 | $ 1,480
Unrealized Losses, 12 Months or More | $ (4) | $ (38)
Number of positions | security | 1 | 2
Fair Value | $ 1,009 | $ 1,480
Unrealized Losses | $ (4) | $ (38)
Obligations of states and political subdivisions |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 10 | 34
Fair Value, Less than 12 Months | $ 16,669 | $ 22,159
Unrealized Losses, Less than 12 Months | $ (156) | $ (193)
Number of positions, 12 Months or More | security | 0 | 26
Fair value, 12 Months or More | $ 0 | $ 16,775
Unrealized Losses, 12 Months or More | $ 0 | $ (374)
Number of positions | security | 10 | 60
Fair Value | $ 16,669 | $ 38,934
Unrealized Losses | $ (156) | $ (567)
Trust preferred securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 0 | 0
Fair Value, Less than 12 Months | $ 0 | $ 0
Unrealized Losses, Less than 12 Months | $ 0 | $ 0
Number of positions, 12 Months or More | security | 2 | 2
Fair value, 12 Months or More | $ 9,862 | $ 10,633
Unrealized Losses, 12 Months or More | $ (2,298) | $ (1,726)
Number of positions | security | 2 | 2
Fair Value | $ 9,862 | $ 10,633
Unrealized Losses | $ (2,298) | $ (1,726)
Other debt securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 1 | 12
Fair Value, Less than 12 Months | $ 610 | $ 19,011
Unrealized Losses, Less than 12 Months | $ (1) | $ (88)
Number of positions, 12 Months or More | security | 1 | 3
Fair value, 12 Months or More | $ 750 | $ 5,621
Unrealized Losses, 12 Months or More | $ (2) | $ (223)
Number of positions | security | 2 | 15
Fair Value | $ 1,360 | $ 24,632
Unrealized Losses | $ (3) | $ (311)
Government agency mortgage backed securities | Residential mortgage backed securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 19 | 91
Fair Value, Less than 12 Months | $ 143,731 | $ 354,731
Unrealized Losses, Less than 12 Months | $ (1,058) | $ (3,945)
Number of positions, 12 Months or More | security | 19 | 73
Fair value, 12 Months or More | $ 29,922 | $ 125,757
Unrealized Losses, 12 Months or More | $ (328) | $ (5,181)
Number of positions | security | 38 | 164
Fair Value | $ 173,653 | $ 480,488
Unrealized Losses | $ (1,386) | $ (9,126)
Government agency mortgage backed securities | Commercial mortgage-backed securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 0 | 5
Fair Value, Less than 12 Months | $ 0 | $ 6,506
Unrealized Losses, Less than 12 Months | $ 0 | $ (74)
Number of positions, 12 Months or More | security | 2 | 4
Fair value, 12 Months or More | $ 1,204 | $ 7,468
Unrealized Losses, 12 Months or More | $ (2) | $ (310)
Number of positions | security | 2 | 9
Fair Value | $ 1,204 | $ 13,974
Unrealized Losses | $ (2) | $ (384)
Government agency collateralized mortgage obligations | Residential mortgage backed securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 8 | 24
Fair Value, Less than 12 Months | $ 42,687 | $ 97,451
Unrealized Losses, Less than 12 Months | $ (268) | $ (840)
Number of positions, 12 Months or More | security | 0 | 60
Fair value, 12 Months or More | $ 0 | $ 140,076
Unrealized Losses, 12 Months or More | $ 0 | $ (5,142)
Number of positions | security | 8 | 84
Fair Value | $ 42,687 | $ 237,527
Unrealized Losses | $ (268) | $ (5,982)
Government agency collateralized mortgage obligations | Commercial mortgage-backed securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 1 | 2
Fair Value, Less than 12 Months | $ 5,003 | $ 9,950
Unrealized Losses, Less than 12 Months | $ (20) | $ (23)
Number of positions, 12 Months or More | security | 0 | 1
Fair value, 12 Months or More | $ 0 | $ 4,888
Unrealized Losses, 12 Months or More | $ 0 | $ (112)
Number of positions | security | 1 | 3
Fair Value | $ 5,003 | $ 14,838
Unrealized Losses | $ (20) | $ (135)

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