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Securities - Gross Unrealized Losses and Fair Value by Investment Category (Details) $ in Thousands | Mar. 31, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
--- | --- | ---
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 89 | 21
Fair Value, Less than 12 Months | $ 637,692 | $ 75,359
Unrealized Losses, Less than 12 Months | $ (10,432) | $ (211)
Number of positions, 12 Months or More | security | 3 | 4
Fair value, 12 Months or More | $ 3,142 | $ 10,037
Unrealized Losses, 12 Months or More | $ (51) | $ (3,004)
Number of positions | security | 92 | 25
Fair Value | $ 640,834 | $ 85,396
Unrealized Losses | $ (10,483) | $ (3,215)
Obligations of states and political subdivisions |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 41 | 6
Fair Value, Less than 12 Months | $ 97,392 | $ 9,403
Unrealized Losses, Less than 12 Months | $ (1,634) | $ (45)
Number of positions, 12 Months or More | security | 1 | 0
Fair value, 12 Months or More | $ 2,133 | $ 0
Unrealized Losses, 12 Months or More | $ (48) | $ 0
Number of positions | security | 42 | 6
Fair Value | $ 99,525 | $ 9,403
Unrealized Losses | $ (1,682) | $ (45)
Trust preferred securities |  |
Available for Sale: |  |
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 |  | 2
Fair value, 12 Months or More |  | $ 9,012
Unrealized Losses, 12 Months or More |  | $ (3,001)
Number of positions | security |  | 2
Fair Value |  | $ 9,012
Unrealized Losses |  | $ (3,001)
Other debt securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 6 | 4
Fair Value, Less than 12 Months | $ 9,042 | $ 3,330
Unrealized Losses, Less than 12 Months | $ (37) | $ (70)
Number of positions, 12 Months or More | security | 1 | 1
Fair value, 12 Months or More | $ 557 | $ 566
Unrealized Losses, 12 Months or More | $ (3) | $ (3)
Number of positions | security | 7 | 5
Fair Value | $ 9,599 | $ 3,896
Unrealized Losses | $ (40) | $ (73)
Government agency mortgage backed securities | Residential mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 14 | 2
Fair Value, Less than 12 Months | $ 119,498 | $ 19,755
Unrealized Losses, Less than 12 Months | $ (2,206) | $ (23)
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 | 14 | 2
Fair Value | $ 119,498 | $ 19,755
Unrealized Losses | $ (2,206) | $ (23)
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 1 | 1
Fair Value, Less than 12 Months | $ 1,082 | $ 1,538
Unrealized Losses, Less than 12 Months | $ (23) | $ (1)
Number of positions, 12 Months or More | security | 1 | 1
Fair value, 12 Months or More | $ 452 | $ 459
Unrealized Losses, 12 Months or More | $ 0 | $ 0
Number of positions | security | 2 | 2
Fair Value | $ 1,534 | $ 1,997
Unrealized Losses | $ (23) | $ (1)
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 17 | 5
Fair Value, Less than 12 Months | $ 351,956 | $ 27,143
Unrealized Losses, Less than 12 Months | $ (4,718) | $ (51)
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 | 17 | 5
Fair Value | $ 351,956 | $ 27,143
Unrealized Losses | $ (4,718) | $ (51)
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 10 | 3
Fair Value, Less than 12 Months | $ 58,722 | $ 14,190
Unrealized Losses, Less than 12 Months | $ (1,814) | $ (21)
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 | 10 | 3
Fair Value | $ 58,722 | $ 14,190
Unrealized Losses | $ (1,814) | $ (21)

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