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Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized cost | $ 450,873 | $ 507,186
Gross unrealized gains | 67 | 536
Gross unrealized losses | 56,856 | 62,328
Estimated fair value | 394,084 | 445,394
U.S Treasuries [Member] |  |
Amortized cost | 10,963 | 10,951
Gross unrealized gains | 0 | 0
Gross unrealized losses | 1,069 | 1,137
Estimated fair value | 9,894 | 9,814
U.S. Government sponsored enterprises |  |
Amortized cost | 11,714 | 12,245
Gross unrealized gains | 0 |
Gross unrealized losses | 694 | 706
Estimated fair value | 11,020 | 11,539
Mortgage-backed securities |  |
Amortized cost | 298,133 | 299,222
Gross unrealized gains | 67 | 445
Gross unrealized losses | 28,480 | 25,829
Estimated fair value | 269,720 | 273,838
State and political subdivisions |  |
Amortized cost | 130,063 | 184,768
Gross unrealized gains |  | 91
Gross unrealized losses | 26,613 | 34,656
Estimated fair value | $ 103,450 | $ 150,203

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