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Securities - Fair Value and Age of Gross Unrealized Losses of Debt Securities (Details) $ in Thousands | Dec. 31, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
--- | --- | ---
Number of Securities |  |
Less Than 12 Months | security | 15 | 116
12 Months or More | security | 118 | 31
Total | security | 133 | 147
Fair Value |  |
Less Than 12 Months | $ 45,297 | $ 663,656
12 Months or More | 794,365 | 308,067
Total | 839,662 | 971,723
Unrealized Losses |  |
Less Than 12 Months | (371) | (46,120)
12 Months or More | (83,380) | (56,462)
Total | $ (83,751) | $ (102,582)
U.S. Treasury securities |  |
Number of Securities |  |
Less Than 12 Months | security | 1 | 6
12 Months or More | security | 13 | 8
Total | security | 14 | 14
Fair Value |  |
Less Than 12 Months | $ 10,036 | $ 57,057
12 Months or More | 123,750 | 74,638
Total | 133,786 | 131,695
Unrealized Losses |  |
Less Than 12 Months | (52) | (3,363)
12 Months or More | (10,454) | (10,358)
Total | $ (10,506) | $ (13,721)
Obligations of U.S. government corporations and agencies |  |
Number of Securities |  |
Less Than 12 Months | security | 0 | 6
12 Months or More | security | 5 | 0
Total | security | 5 | 6
Fair Value |  |
Less Than 12 Months | $ 0 | $ 41,811
12 Months or More | 32,513 | 0
Total | 32,513 | 41,811
Unrealized Losses |  |
Less Than 12 Months | 0 | (1,668)
12 Months or More | (829) | 0
Total | $ (829) | $ (1,668)
Collateralized mortgage obligations of U.S. government corporations and agencies |  |
Number of Securities |  |
Less Than 12 Months | security | 4 | 47
12 Months or More | security | 57 | 13
Total | security | 61 | 60
Fair Value |  |
Less Than 12 Months | $ 35,161 | $ 296,509
12 Months or More | 351,220 | 112,902
Total | 386,381 | 409,411
Unrealized Losses |  |
Less Than 12 Months | (318) | (28,153)
12 Months or More | (47,753) | (25,682)
Total | $ (48,071) | $ (53,835)
Residential mortgage-backed securities of U.S. government corporations and agencies |  |
Number of Securities |  |
Less Than 12 Months | security | 10 | 25
12 Months or More | security | 14 | 3
Total | security | 24 | 28
Fair Value |  |
Less Than 12 Months | $ 100 | $ 7,143
12 Months or More | 37,877 | 34,223
Total | 37,977 | 41,366
Unrealized Losses |  |
Less Than 12 Months | (1) | (589)
12 Months or More | (6,536) | (7,245)
Total | $ (6,537) | $ (7,834)
Commercial mortgage-backed securities of U.S. government corporations and agencies |  |
Number of Securities |  |
Less Than 12 Months | security | 0 | 30
12 Months or More | security | 29 | 7
Total | security | 29 | 37
Fair Value |  |
Less Than 12 Months | $ 0 | $ 241,009
12 Months or More | 249,005 | 86,304
Total | 249,005 | 327,313
Unrealized Losses |  |
Less Than 12 Months | 0 | (11,975)
12 Months or More | (17,808) | (13,177)
Total | $ (17,808) | $ (25,152)
Obligations of states and political subdivisions |  |
Number of Securities |  |
Less Than 12 Months | security | 0 | 2
12 Months or More | security | 0 | 0
Total | security | 0 | 2
Fair Value |  |
Less Than 12 Months | $ 0 | $ 20,127
12 Months or More |  | 0
Total | 0 | 20,127
Unrealized Losses |  |
Less Than 12 Months | 0 | (372)
12 Months or More |  | 0
Total | $ 0 | $ (372)

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