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Securities - Fair Value and Age of Gross Unrealized Losses of Debt Securities (Details) $ in Thousands | Mar. 31, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
--- | --- | ---
Number of Securities |  |
Less Than 12 Months | security | 25 | 15
12 Months or More | security | 118 | 118
Total | security | 143 | 133
Fair Value |  |
Less Than 12 Months | $ 119,692 | $ 45,297
12 Months or More | 788,370 | 794,365
Total | 908,062 | 839,662
Unrealized Losses |  |
Less Than 12 Months | (1,063) | (371)
12 Months or More | (87,348) | (83,380)
Total | $ (88,411) | $ (83,751)
U.S. Treasury securities |  |
Number of Securities |  |
Less Than 12 Months | security | 1 | 1
12 Months or More | security | 13 | 13
Total | security | 14 | 14
Fair Value |  |
Less Than 12 Months | $ 9,956 | $ 10,036
12 Months or More | 122,630 | 123,750
Total | 132,586 | 133,786
Unrealized Losses |  |
Less Than 12 Months | (119) | (52)
12 Months or More | (11,304) | (10,454)
Total | $ (11,423) | $ (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 | 5 | 5
Total | security | 5 | 5
Fair Value |  |
Less Than 12 Months | $ 0 | $ 0
12 Months or More | 32,593 | 32,513
Total | 32,593 | 32,513
Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or More | (709) | (829)
Total | $ (709) | $ (829)
Collateralized mortgage obligations of U.S. government corporations and agencies |  |
Number of Securities |  |
Less Than 12 Months | security | 8 | 4
12 Months or More | security | 58 | 57
Total | security | 66 | 61
Fair Value |  |
Less Than 12 Months | $ 74,366 | $ 35,161
12 Months or More | 355,094 | 351,220
Total | 429,460 | 386,381
Unrealized Losses |  |
Less Than 12 Months | (741) | (318)
12 Months or More | (50,021) | (47,753)
Total | $ (50,762) | $ (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 | $ 91 | $ 100
12 Months or More | 36,394 | 37,877
Total | 36,485 | 37,977
Unrealized Losses |  |
Less Than 12 Months | (1) | (1)
12 Months or More | (7,055) | (6,536)
Total | $ (7,056) | $ (6,537)
Commercial mortgage-backed securities of U.S. government corporations and agencies |  |
Number of Securities |  |
Less Than 12 Months | security | 1 | 0
12 Months or More | security | 28 | 29
Total | security | 29 | 29
Fair Value |  |
Less Than 12 Months | $ 10,274 | $ 0
12 Months or More | 241,659 | 249,005
Total | 251,933 | 249,005
Unrealized Losses |  |
Less Than 12 Months | (74) | 0
12 Months or More | (18,259) | (17,808)
Total | $ (18,333) | $ (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 | $ 25,005 |
12 Months or More | 0 |
Total | 25,005 |
Unrealized Losses |  |
Less Than 12 Months | (128) |
12 Months or More | 0 |
Total | $ (128) |

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