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Securities - Fair Value and Age of Gross Unrealized Losses of Debt Securities (Details) $ in Thousands | Jun. 30, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
--- | --- | ---
Number of Securities |  |
Less Than 12 Months | security | 29 | 15
12 Months or More | security | 114 | 118
Total | security | 143 | 133
Fair Value |  |
Less Than 12 Months | $ 162,917 | $ 45,297
12 Months or More | 733,806 | 794,365
Total | 896,723 | 839,662
Unrealized Losses |  |
Less Than 12 Months | (1,722) | (371)
12 Months or More | (83,378) | (83,380)
Total | $ (85,100) | $ (83,751)
U.S. Treasury securities |  |
Number of Securities |  |
Less Than 12 Months | security | 0 | 1
12 Months or More | security | 12 | 13
Total | security | 12 | 14
Fair Value |  |
Less Than 12 Months | $ 0 | $ 10,036
12 Months or More | 113,449 | 123,750
Total | 113,449 | 133,786
Unrealized Losses |  |
Less Than 12 Months | 0 | (52)
12 Months or More | (9,847) | (10,454)
Total | $ (9,847) | $ (10,506)
Obligations of U.S. government corporations and agencies |  |
Number of Securities |  |
Less Than 12 Months | security | 0 | 0
12 Months or More | security | 4 | 5
Total | security | 4 | 5
Fair Value |  |
Less Than 12 Months | $ 0 | $ 0
12 Months or More | 24,786 | 32,513
Total | 24,786 | 32,513
Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or More | (524) | (829)
Total | $ (524) | $ (829)
Collateralized mortgage obligations of U.S. government corporations and agencies |  |
Number of Securities |  |
Less Than 12 Months | security | 11 | 4
12 Months or More | security | 60 | 57
Total | security | 71 | 61
Fair Value |  |
Less Than 12 Months | $ 108,262 | $ 35,161
12 Months or More | 357,948 | 351,220
Total | 466,210 | 386,381
Unrealized Losses |  |
Less Than 12 Months | (893) | (318)
12 Months or More | (49,930) | (47,753)
Total | $ (50,823) | $ (48,071)
Residential mortgage-backed securities of U.S. government corporations and agencies |  |
Number of Securities |  |
Less Than 12 Months | security | 11 | 10
12 Months or More | security | 14 | 14
Total | security | 25 | 24
Fair Value |  |
Less Than 12 Months | $ 69 | $ 100
12 Months or More | 35,057 | 37,877
Total | 35,126 | 37,977
Unrealized Losses |  |
Less Than 12 Months | 0 | (1)
12 Months or More | (7,005) | (6,536)
Total | $ (7,005) | $ (6,537)
Commercial mortgage-backed securities of U.S. government corporations and agencies |  |
Number of Securities |  |
Less Than 12 Months | security | 3 | 0
12 Months or More | security | 24 | 29
Total | security | 27 | 29
Fair Value |  |
Less Than 12 Months | $ 30,145 | $ 0
12 Months or More | 202,566 | 249,005
Total | 232,711 | 249,005
Unrealized Losses |  |
Less Than 12 Months | (253) | 0
12 Months or More | (16,072) | (17,808)
Total | $ (16,325) | $ (17,808)
Obligations of states and political subdivisions |  |
Number of Securities |  |
Less Than 12 Months | security | 4 |
12 Months or More | security | 0 |
Total | security | 4 |
Fair Value |  |
Less Than 12 Months | $ 24,441 |
12 Months or More | 0 |
Total | 24,441 |
Unrealized Losses |  |
Less Than 12 Months | (576) |
12 Months or More | 0 |
Total | $ (576) |

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