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Investment Securities (Details 1) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Less than 12 months, fair value | $ 33,158 | $ 199,903
Less than 12 months, unrealized losses | 1,336 | 16,697
12 months or more, fair value | 340,845 | 212,326
12 months or more, unrealized losses | 64,930 | 45,631
Total, fair value | 374,003 | 412,229
Total, unrealized losses | 66,266 | 62,328
U.S Treasuries [Member] |  |
Less than 12 months, fair value | 0 | 2,878
Less than 12 months, unrealized losses | 0 | 104
12 months or more, fair value | 9,838 | 6,936
12 months or more, unrealized losses | 1,130 | 1,033
Total, fair value | 9,838 | 9,814
Total, unrealized losses | 1,130 | 1,137
U.S. Government sponsored enterprises |  |
Less than 12 months, fair value | 0 | 2,904
Less than 12 months, unrealized losses | 0 | 87
12 months or more, fair value | 10,745 | 8,635
12 months or more, unrealized losses | 765 | 619
Total, fair value | 10,745 | 11,539
Total, unrealized losses | 765 | 706
Mortgage-backed securities |  |
Less than 12 months, fair value | 33,158 | 128,241
Less than 12 months, unrealized losses | 1,336 | 8,740
12 months or more, fair value | 221,918 | 120,464
12 months or more, unrealized losses | 31,379 | 17,089
Total, fair value | 255,076 | 248,705
Total, unrealized losses | 32,715 | 25,829
State and political subdivisions |  |
Less than 12 months, fair value | 0 | 65,880
Less than 12 months, unrealized losses | 0 | 7,766
12 months or more, fair value | 98,344 | 76,291
12 months or more, unrealized losses | 31,656 | 26,890
Total, fair value | 98,344 | 142,171
Total, unrealized losses | $ 31,656 | $ 34,656

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