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Securities - Gross Unrealized Losses and Fair Value by Investment Category (Details) $ in Thousands | Sep. 30, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
--- | --- | ---
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 143 | 21
Fair Value, Less than 12 Months | $ 1,512,911 | $ 75,359
Unrealized Losses, Less than 12 Months | $ (14,503) | $ (211)
Number of positions, 12 Months or More | security | 5 | 4
Fair value, 12 Months or More | $ 7,327 | $ 10,037
Unrealized Losses, 12 Months or More | $ (123) | $ (3,004)
Number of positions | security | 148 | 25
Fair Value | $ 1,520,238 | $ 85,396
Unrealized Losses | $ (14,626) | $ (3,215)
Obligations of states and political subdivisions |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 46 | 6
Fair Value, Less than 12 Months | $ 145,658 | $ 9,403
Unrealized Losses, Less than 12 Months | $ (2,338) | $ (45)
Number of positions, 12 Months or More | security | 3 | 0
Fair value, 12 Months or More | $ 3,884 | $ 0
Unrealized Losses, 12 Months or More | $ (88) | $ 0
Number of positions | security | 49 | 6
Fair Value | $ 149,542 | $ 9,403
Unrealized Losses | $ (2,426) | $ (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 |  | 4
Fair Value, Less than 12 Months |  | $ 3,330
Unrealized Losses, Less than 12 Months |  | $ (70)
Number of positions, 12 Months or More | security |  | 1
Fair value, 12 Months or More |  | $ 566
Unrealized Losses, 12 Months or More |  | $ (3)
Number of positions | security |  | 5
Fair Value |  | $ 3,896
Unrealized Losses |  | $ (73)
Government agency mortgage backed securities | Residential mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 45 | 2
Fair Value, Less than 12 Months | $ 508,398 | $ 19,755
Unrealized Losses, Less than 12 Months | $ (3,689) | $ (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 | 45 | 2
Fair Value | $ 508,398 | $ 19,755
Unrealized Losses | $ (3,689) | $ (23)
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 17 | 1
Fair Value, Less than 12 Months | $ 3,673 | $ 1,538
Unrealized Losses, Less than 12 Months | $ (1) | $ (1)
Number of positions, 12 Months or More | security | 1 | 1
Fair value, 12 Months or More | $ 439 | $ 459
Unrealized Losses, 12 Months or More | $ 0 | $ 0
Number of positions | security | 18 | 2
Fair Value | $ 4,112 | $ 1,997
Unrealized Losses | $ (1) | $ (1)
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 33 | 5
Fair Value, Less than 12 Months | $ 726,128 | $ 27,143
Unrealized Losses, Less than 12 Months | $ (6,172) | $ (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 | 33 | 5
Fair Value | $ 726,128 | $ 27,143
Unrealized Losses | $ (6,172) | $ (51)
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 2 | 3
Fair Value, Less than 12 Months | $ 129,054 | $ 14,190
Unrealized Losses, Less than 12 Months | $ (2,303) | $ (21)
Number of positions, 12 Months or More | security | 1 | 0
Fair value, 12 Months or More | $ 3,004 | $ 0
Unrealized Losses, 12 Months or More | $ (35) | $ 0
Number of positions | security | 3 | 3
Fair Value | $ 132,058 | $ 14,190
Unrealized Losses | $ (2,338) | $ (21)

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