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Securities - Gross Unrealized Losses and Fair Value by Investment Category (Details) $ in Thousands | Mar. 31, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
--- | --- | ---
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 219 | 121
Fair Value, Less than 12 Months | $ 1,987,809 | $ 1,899,384
Unrealized Losses, Less than 12 Months | $ (133,960) | $ (30,120)
Number of positions, 12 Months or More | security | 22 | 7
Fair value, 12 Months or More | $ 173,753 | $ 25,634
Unrealized Losses, 12 Months or More | $ (18,543) | $ (904)
Number of positions | security | 241 | 128
Fair Value | $ 2,161,562 | $ 1,925,018
Unrealized Losses | $ (152,503) | $ (31,024)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 197 | 90
Fair Value, Less than 12 Months | $ 416,494 | $ 201,791
Unrealized Losses, Less than 12 Months | $ (34,916) | $ (1,154)
Number of positions, 12 Months or More | security | 4 | 1
Fair Value, 12 Months or More | $ 33,047 | $ 5,354
Unrealized Losses, 12 Months or More | $ (2,769) | $ (17)
Number of positions | security | 201 | 91
Fair Value | $ 449,541 | $ 207,145
Unrealized Losses | $ (37,685) | $ (1,171)
Obligations of states and political subdivisions |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 41 | 8
Fair Value, Less than 12 Months | $ 81,646 | $ 34,303
Unrealized Losses, Less than 12 Months | $ (4,767) | $ (216)
Number of positions, 12 Months or More | security | 4 | 3
Fair value, 12 Months or More | $ 5,805 | $ 3,892
Unrealized Losses, 12 Months or More | $ (438) | $ (53)
Number of positions | security | 45 | 11
Fair Value | $ 87,451 | $ 38,195
Unrealized Losses | $ (5,205) | $ (269)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 127 | 24
Fair Value, Less than 12 Months | $ 261,920 | $ 62,131
Unrealized Losses, Less than 12 Months | $ (26,786) | $ (685)
Number of positions, 12 Months or More | security | 1 | 0
Fair Value, 12 Months or More | $ 1,699 | $ 0
Unrealized Losses, 12 Months or More | $ (183) | $ 0
Number of positions | security | 128 | 24
Fair Value | $ 263,619 | $ 62,131
Unrealized Losses | $ (26,969) | $ (685)
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 |  | 0
Fair value, 12 Months or More |  | $ 0
Unrealized Losses, 12 Months or More |  | $ 0
Number of positions | security |  | 0
Fair Value |  | $ 0
Unrealized Losses |  | $ 0
Other debt securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 10 | 1
Fair Value, Less than 12 Months | $ 51,369 | $ 8,699
Unrealized Losses, Less than 12 Months | $ (1,991) | $ (148)
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 | 1
Fair Value | $ 51,369 | $ 8,699
Unrealized Losses | $ (1,991) | $ (148)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 8 | 8
Fair Value, Less than 12 Months | $ 20,818 | $ 21,972
Unrealized Losses, Less than 12 Months | $ (1,120) | $ (79)
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 | 8 | 8
Fair Value | $ 20,818 | $ 21,972
Unrealized Losses | $ (1,120) | $ (79)
Government agency mortgage backed securities | Residential mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 80 | 41
Fair Value, Less than 12 Months | $ 761,484 | $ 727,546
Unrealized Losses, Less than 12 Months | $ (43,653) | $ (6,312)
Number of positions, 12 Months or More | security | 6 | 1
Fair value, 12 Months or More | $ 49,651 | $ 12,305
Unrealized Losses, 12 Months or More | $ (4,840) | $ (504)
Number of positions | security | 86 | 42
Fair Value | $ 811,135 | $ 739,851
Unrealized Losses | $ (48,493) | $ (6,816)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 55 | 50
Fair Value, Less than 12 Months | $ 86,842 | $ 53,560
Unrealized Losses, Less than 12 Months | $ (3,599) | $ (181)
Number of positions, 12 Months or More | security | 1 | 1
Fair Value, 12 Months or More | $ 4,584 | $ 5,354
Unrealized Losses, 12 Months or More | $ (344) | $ (17)
Number of positions | security | 56 | 51
Fair Value | $ 91,426 | $ 58,914
Unrealized Losses | $ (3,943) | $ (198)
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 3 | 1
Fair Value, Less than 12 Months | $ 10,481 | $ 1,791
Unrealized Losses, Less than 12 Months | $ (371) | $ (1)
Number of positions, 12 Months or More | security | 1 | 1
Fair value, 12 Months or More | $ 425 | $ 432
Unrealized Losses, 12 Months or More | $ 0 | $ 0
Number of positions | security | 4 | 2
Fair Value | $ 10,906 | $ 2,223
Unrealized Losses | $ (371) | $ (1)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 1 |
Fair Value, Less than 12 Months | $ 15,534 |
Unrealized Losses, Less than 12 Months | $ (1,488) |
Number of positions, 12 Months or More | security | 0 |
Fair Value, 12 Months or More | $ 0 |
Unrealized Losses, 12 Months or More | $ 0 |
Number of positions | security | 1 |
Fair Value | $ 15,534 |
Unrealized Losses | $ (1,488) |
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 61 | 49
Fair Value, Less than 12 Months | $ 932,820 | $ 966,126
Unrealized Losses, Less than 12 Months | $ (74,437) | $ (20,371)
Number of positions, 12 Months or More | security | 4 | 0
Fair value, 12 Months or More | $ 77,376 | $ 0
Unrealized Losses, 12 Months or More | $ (9,154) | $ 0
Number of positions | security | 65 | 49
Fair Value | $ 1,010,196 | $ 966,126
Unrealized Losses | $ (83,591) | $ (20,371)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 0 | 1
Fair Value, Less than 12 Months | $ 0 | $ 24,740
Unrealized Losses, Less than 12 Months | $ 0 | $ (92)
Number of positions, 12 Months or More | security | 1 | 0
Fair Value, 12 Months or More | $ 21,499 | $ 0
Unrealized Losses, 12 Months or More | $ (1,904) | $ 0
Number of positions | security | 1 | 1
Fair Value | $ 21,499 | $ 24,740
Unrealized Losses | $ (1,904) | $ (92)
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 24 | 21
Fair Value, Less than 12 Months | $ 150,009 | $ 160,919
Unrealized Losses, Less than 12 Months | $ (8,741) | $ (3,072)
Number of positions, 12 Months or More | security | 7 | 2
Fair value, 12 Months or More | $ 40,496 | $ 9,005
Unrealized Losses, 12 Months or More | $ (4,111) | $ (347)
Number of positions | security | 31 | 23
Fair Value | $ 190,505 | $ 169,924
Unrealized Losses | $ (12,852) | $ (3,419)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 6 | 7
Fair Value, Less than 12 Months | $ 31,380 | $ 39,388
Unrealized Losses, Less than 12 Months | $ (1,923) | $ (117)
Number of positions, 12 Months or More | security | 1 | 0
Fair Value, 12 Months or More | $ 5,265 | $ 0
Unrealized Losses, 12 Months or More | $ (338) | $ 0
Number of positions | security | 7 | 7
Fair Value | $ 36,645 | $ 39,388
Unrealized Losses | $ (2,261) | $ (117)

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