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Securities - Investment Category and Length of Time in Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2020 USD ($) security | Dec. 31, 2019 USD ($) security
--- | --- | ---
Unrealized losses and fair value by investment category |  |
Number of positions, Less than 12 Months | security | 21 | 79
Fair Value, Less than 12 Months | $ 75,359 | $ 331,023
Unrealized Losses, Less than 12 Months | $ (211) | $ (2,394)
Number of positions, 12 Months or More | security | 4 | 22
Fair Value, 12 Months or More | $ 10,037 | $ 33,700
Unrealized Losses, 12 Months or More | $ (3,004) | $ (2,484)
Number of positions | security | 25 | 101
Fair Value | $ 85,396 | $ 364,723
Unrealized Losses | $ (3,215) | $ (4,878)
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
Fair Value, Less than 12 Months |  | $ 0
Unrealized Losses, Less than 12 Months |  | $ 0
Number of positions, 12 Months or More | security |  | 1
Fair Value, 12 Months or More |  | $ 1,008
Unrealized Losses, 12 Months or More |  | $ (3)
Number of positions | security |  | 1
Fair Value |  | $ 1,008
Unrealized Losses |  | $ (3)
Obligations of states and political subdivisions |  |
Unrealized losses and fair value by investment category |  |
Number of positions, Less than 12 Months | security | 6 | 26
Fair Value, Less than 12 Months | $ 9,403 | $ 33,902
Unrealized Losses, Less than 12 Months | $ (45) | $ (365)
Number of positions, 12 Months or More | security | 0 | 0
Fair Value, 12 Months or More | $ 0 | $ 0
Unrealized Losses, 12 Months or More | $ 0 | $ 0
Number of positions | security | 6 | 26
Fair Value | $ 9,403 | $ 33,902
Unrealized Losses | $ (45) | $ (365)
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 | $ 9,012 | $ 9,986
Unrealized Losses, 12 Months or More | $ (3,001) | $ (2,167)
Number of positions | security | 2 | 2
Fair Value | $ 9,012 | $ 9,986
Unrealized Losses | $ (3,001) | $ (2,167)
Other debt securities |  |
Unrealized losses and fair value by investment category |  |
Number of positions, Less than 12 Months | security | 4 | 3
Fair Value, Less than 12 Months | $ 3,330 | $ 8,737
Unrealized Losses, Less than 12 Months | $ (70) | $ (131)
Number of positions, 12 Months or More | security | 1 | 1
Fair Value, 12 Months or More | $ 566 | $ 741
Unrealized Losses, 12 Months or More | $ (3) | $ (1)
Number of positions | security | 5 | 4
Fair Value | $ 3,896 | $ 9,478
Unrealized Losses | $ (73) | $ (132)
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 | 2 | 37
Fair Value, Less than 12 Months | $ 19,755 | $ 233,179
Unrealized Losses, Less than 12 Months | $ (23) | $ (1,504)
Number of positions, 12 Months or More | security | 0 | 16
Fair Value, 12 Months or More | $ 0 | $ 20,775
Unrealized Losses, 12 Months or More | $ 0 | $ (312)
Number of positions | security | 2 | 53
Fair Value | $ 19,755 | $ 253,954
Unrealized Losses | $ (23) | $ (1,816)
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 | 1
Fair Value, Less than 12 Months | $ 1,538 | $ 4,976
Unrealized Losses, Less than 12 Months | $ (1) | $ (23)
Number of positions, 12 Months or More | security | 1 | 2
Fair Value, 12 Months or More | $ 459 | $ 1,190
Unrealized Losses, 12 Months or More | $ 0 | $ (1)
Number of positions | security | 2 | 3
Fair Value | $ 1,997 | $ 6,166
Unrealized Losses | $ (1) | $ (24)
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 | 5 | 11
Fair Value, Less than 12 Months | $ 27,143 | $ 45,319
Unrealized Losses, Less than 12 Months | $ (51) | $ (262)
Number of positions, 12 Months or More | security | 0 | 0
Fair Value, 12 Months or More | $ 0 | $ 0
Unrealized Losses, 12 Months or More | $ 0 | $ 0
Number of positions | security | 5 | 11
Fair Value | $ 27,143 | $ 45,319
Unrealized Losses | $ (51) | $ (262)
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 | 3 | 1
Fair Value, Less than 12 Months | $ 14,190 | $ 4,910
Unrealized Losses, Less than 12 Months | $ (21) | $ (109)
Number of positions, 12 Months or More | security | 0 | 0
Fair Value, 12 Months or More | $ 0 | $ 0
Unrealized Losses, 12 Months or More | $ 0 | $ 0
Number of positions | security | 3 | 1
Fair Value | $ 14,190 | $ 4,910
Unrealized Losses | $ (21) | $ (109)

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