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Securities - Gross Unrealized Losses and Fair Value by Investment Category (Details) $ in Thousands | Jun. 30, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
--- | --- | ---
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 71 | 21
Fair Value, Less than 12 Months | $ 789,279 | $ 75,359
Unrealized Losses, Less than 12 Months | $ (6,310) | $ (211)
Number of positions, 12 Months or More | security | 15 | 4
Fair value, 12 Months or More | $ 118,045 | $ 10,037
Unrealized Losses, 12 Months or More | $ (1,582) | $ (3,004)
Number of positions | security | 86 | 25
Fair Value | $ 907,324 | $ 85,396
Unrealized Losses | $ (7,892) | $ (3,215)
Obligations of states and political subdivisions |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 20 | 6
Fair Value, Less than 12 Months | $ 40,176 | $ 9,403
Unrealized Losses, Less than 12 Months | $ (414) | $ (45)
Number of positions, 12 Months or More | security | 1 | 0
Fair value, 12 Months or More | $ 2,166 | $ 0
Unrealized Losses, 12 Months or More | $ (11) | $ 0
Number of positions | security | 21 | 6
Fair Value | $ 42,342 | $ 9,403
Unrealized Losses | $ (425) | $ (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 | 1 | 4
Fair Value, Less than 12 Months | $ 1,000 | $ 3,330
Unrealized Losses, Less than 12 Months | $ 0 | $ (70)
Number of positions, 12 Months or More | security | 0 | 1
Fair value, 12 Months or More | $ 0 | $ 566
Unrealized Losses, 12 Months or More | $ 0 | $ (3)
Number of positions | security | 1 | 5
Fair Value | $ 1,000 | $ 3,896
Unrealized Losses | $ 0 | $ (73)
Government agency mortgage backed securities | Residential mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 25 | 2
Fair Value, Less than 12 Months | $ 210,509 | $ 19,755
Unrealized Losses, Less than 12 Months | $ (1,572) | $ (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 | 25 | 2
Fair Value | $ 210,509 | $ 19,755
Unrealized Losses | $ (1,572) | $ (23)
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 0 | 1
Fair Value, Less than 12 Months | $ 0 | $ 1,538
Unrealized Losses, Less than 12 Months | $ 0 | $ (1)
Number of positions, 12 Months or More | security | 1 | 1
Fair value, 12 Months or More | $ 446 | $ 459
Unrealized Losses, 12 Months or More | $ 0 | $ 0
Number of positions | security | 1 | 2
Fair Value | $ 446 | $ 1,997
Unrealized Losses | $ 0 | $ (1)
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 25 | 5
Fair Value, Less than 12 Months | $ 537,594 | $ 27,143
Unrealized Losses, Less than 12 Months | $ (4,324) | $ (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 | 25 | 5
Fair Value | $ 537,594 | $ 27,143
Unrealized Losses | $ (4,324) | $ (51)
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 0 | 3
Fair Value, Less than 12 Months | $ 0 | $ 14,190
Unrealized Losses, Less than 12 Months | $ 0 | $ (21)
Number of positions, 12 Months or More | security | 13 | 0
Fair value, 12 Months or More | $ 115,433 | $ 0
Unrealized Losses, 12 Months or More | $ (1,571) | $ 0
Number of positions | security | 13 | 3
Fair Value | $ 115,433 | $ 14,190
Unrealized Losses | $ (1,571) | $ (21)

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