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Securities - Fair Value and Age of Gross Unrealized Losses of Debt Securities (Details) $ in Thousands | Sep. 30, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
--- | --- | ---
Number of Securities |  |
Less Than 12 Months | security | 17 | 15
12 Months or More | security | 97 | 118
Total | security | 114 | 133
Fair Value |  |
Less Than 12 Months | $ 88,746 | $ 45,297
12 Months or More | 630,352 | 794,365
Total | 719,098 | 839,662
Unrealized Losses |  |
Less Than 12 Months | (652) | (371)
12 Months or More | (57,282) | (83,380)
Total | $ (57,934) | $ (83,751)
U.S. Treasury securities |  |
Number of Securities |  |
Less Than 12 Months | security | 2 | 1
12 Months or More | security | 8 | 13
Total | security | 10 | 14
Fair Value |  |
Less Than 12 Months | $ 20,311 | $ 10,036
12 Months or More | 77,622 | 123,750
Total | 97,933 | 133,786
Unrealized Losses |  |
Less Than 12 Months | (60) | (52)
12 Months or More | (4,840) | (10,454)
Total | $ (4,900) | $ (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 | 2 | 5
Total | security | 2 | 5
Fair Value |  |
Less Than 12 Months | $ 0 | $ 0
12 Months or More | 15,026 | 32,513
Total | 15,026 | 32,513
Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or More | (256) | (829)
Total | $ (256) | $ (829)
Collateralized mortgage obligations of U.S. government corporations and agencies |  |
Number of Securities |  |
Less Than 12 Months | security | 3 | 4
12 Months or More | security | 56 | 57
Total | security | 59 | 61
Fair Value |  |
Less Than 12 Months | $ 29,281 | $ 35,161
12 Months or More | 339,367 | 351,220
Total | 368,648 | 386,381
Unrealized Losses |  |
Less Than 12 Months | (238) | (318)
12 Months or More | (37,119) | (47,753)
Total | $ (37,357) | $ (48,071)
Residential mortgage-backed securities of U.S. government corporations and agencies |  |
Number of Securities |  |
Less Than 12 Months | security | 8 | 10
12 Months or More | security | 13 | 14
Total | security | 21 | 24
Fair Value |  |
Less Than 12 Months | $ 40 | $ 100
12 Months or More | 35,429 | 37,877
Total | 35,469 | 37,977
Unrealized Losses |  |
Less Than 12 Months | 0 | (1)
12 Months or More | (5,422) | (6,536)
Total | $ (5,422) | $ (6,537)
Commercial mortgage-backed securities of U.S. government corporations and agencies |  |
Number of Securities |  |
Less Than 12 Months | security | 2 | 0
12 Months or More | security | 18 | 29
Total | security | 20 | 29
Fair Value |  |
Less Than 12 Months | $ 19,448 | $ 0
12 Months or More | 162,908 | 249,005
Total | 182,356 | 249,005
Unrealized Losses |  |
Less Than 12 Months | (153) | 0
12 Months or More | (9,645) | (17,808)
Total | $ (9,798) | $ (17,808)
Obligations of states and political subdivisions |  |
Number of Securities |  |
Less Than 12 Months | security | 2 |
12 Months or More | security | 0 |
Total | security | 2 |
Fair Value |  |
Less Than 12 Months | $ 19,666 |
12 Months or More | 0 |
Total | 19,666 |
Unrealized Losses |  |
Less Than 12 Months | (201) |
12 Months or More | 0 |
Total | $ (201) |

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