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Securities - Investment Category and Length of Time in Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2019 USD ($) security | Dec. 31, 2018 USD ($) security
--- | --- | ---
Unrealized losses and fair value by investment category |  |
Number of positions, Less than 12 Months | security | 79 | 168
Fair Value, Less than 12 Months | $ 331,023 | $ 509,808
Unrealized Losses, Less than 12 Months | $ (2,394) | $ (5,163)
Number of positions, 12 Months or More | security | 22 | 171
Fair Value, 12 Months or More | $ 33,700 | $ 312,698
Unrealized Losses, 12 Months or More | $ (2,484) | $ (13,106)
Number of positions | security | 101 | 339
Fair Value | $ 364,723 | $ 822,506
Unrealized Losses | $ (4,878) | $ (18,269)
Obligations of other U.S. Government agencies and corporations |  |
Unrealized losses and fair value by investment category |  |
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 | $ 1,008 | $ 1,480
Unrealized Losses, 12 Months or More | $ (3) | $ (38)
Number of positions | security | 1 | 2
Fair Value | $ 1,008 | $ 1,480
Unrealized Losses | $ (3) | $ (38)
Obligations of states and political subdivisions |  |
Unrealized losses and fair value by investment category |  |
Number of positions, Less than 12 Months | security | 26 | 34
Fair Value, Less than 12 Months | $ 33,902 | $ 22,159
Unrealized Losses, Less than 12 Months | $ (365) | $ (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 | 26 | 60
Fair Value | $ 33,902 | $ 38,934
Unrealized Losses | $ (365) | $ (567)
Trust preferred securities |  |
Unrealized losses and fair value by investment category |  |
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 | $ 9,986 | $ 10,633
Unrealized Losses, 12 Months or More | $ (2,167) | $ (1,726)
Number of positions | security | 2 | 2
Fair Value | $ 9,986 | $ 10,633
Unrealized Losses | $ (2,167) | $ (1,726)
Other debt securities |  |
Unrealized losses and fair value by investment category |  |
Number of positions, Less than 12 Months | security | 3 | 12
Fair Value, Less than 12 Months | $ 8,737 | $ 19,011
Unrealized Losses, Less than 12 Months | $ (131) | $ (88)
Number of positions, 12 Months or More | security | 1 | 3
Fair Value, 12 Months or More | $ 741 | $ 5,621
Unrealized Losses, 12 Months or More | $ (1) | $ (223)
Number of positions | security | 4 | 15
Fair Value | $ 9,478 | $ 24,632
Unrealized Losses | $ (132) | $ (311)
Government agency mortgage backed securities | Residential mortgage backed securities |  |
Unrealized losses and fair value by investment category |  |
Number of positions, Less than 12 Months | security | 37 | 91
Fair Value, Less than 12 Months | $ 233,179 | $ 354,731
Unrealized Losses, Less than 12 Months | $ (1,504) | $ (3,945)
Number of positions, 12 Months or More | security | 16 | 73
Fair Value, 12 Months or More | $ 20,775 | $ 125,757
Unrealized Losses, 12 Months or More | $ (312) | $ (5,181)
Number of positions | security | 53 | 164
Fair Value | $ 253,954 | $ 480,488
Unrealized Losses | $ (1,816) | $ (9,126)
Government agency mortgage backed securities | Commercial mortgage backed securities |  |
Unrealized losses and fair value by investment category |  |
Number of positions, Less than 12 Months | security | 1 | 5
Fair Value, Less than 12 Months | $ 4,976 | $ 6,506
Unrealized Losses, Less than 12 Months | $ (23) | $ (74)
Number of positions, 12 Months or More | security | 2 | 4
Fair Value, 12 Months or More | $ 1,190 | $ 7,468
Unrealized Losses, 12 Months or More | $ (1) | $ (310)
Number of positions | security | 3 | 9
Fair Value | $ 6,166 | $ 13,974
Unrealized Losses | $ (24) | $ (384)
Government agency collateralized mortgage obligations | Residential mortgage backed securities |  |
Unrealized losses and fair value by investment category |  |
Number of positions, Less than 12 Months | security | 11 | 24
Fair Value, Less than 12 Months | $ 45,319 | $ 97,451
Unrealized Losses, Less than 12 Months | $ (262) | $ (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 | 11 | 84
Fair Value | $ 45,319 | $ 237,527
Unrealized Losses | $ (262) | $ (5,982)
Government agency collateralized mortgage obligations | Commercial mortgage backed securities |  |
Unrealized losses and fair value by investment category |  |
Number of positions, Less than 12 Months | security | 1 | 2
Fair Value, Less than 12 Months | $ 4,910 | $ 9,950
Unrealized Losses, Less than 12 Months | $ (109) | $ (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 | $ 4,910 | $ 14,838
Unrealized Losses | $ (109) | $ (135)

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