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Investment Securities - Investments by contractual maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Available-for-Sale Securities |  |
Within one year, amortized cost | $ 0 | $ 0
Within one year, estimated fair value | 0 | 0
After one year through five years, amortized cost | 15,661 | 9,992
After one year through five years, estimated fair value | 14,056 | 8,954
After five years through ten years, amortized cost | 33,585 | 40,264
After five years through ten years, estimated fair value | 29,670 | 35,379
After ten years, amortized cost | 144,514 | 157,804
After ten years, estimated fair value | 129,972 | 144,843
Total securities with single maturity date, amortized cost | 193,760 | 208,060
Total securities with single maturity date, estimated fair value | 173,698 | 189,176
Amortized Cost | 536,334 | 669,646
Estimated Fair Value | 477,113 | 597,196
Held-to-Maturity Securities |  |
Within one year, amortized cost | 0 | 0
Within one year, estimated fair value | 0 | 0
After one year through five years, amortized cost | 24,535 | 8,463
After one year through five years, estimated fair value | 23,368 | 8,136
After five years through ten years, amortized cost | 60,369 | 74,746
After five years through ten years, estimated fair value | 54,685 | 68,552
After ten years, amortized cost | 107,252 | 108,861
After ten years, estimated fair value | 96,765 | 101,264
Total securities with single maturity date, amortized cost | 192,156 | 192,070
Total securities with single maturity date, estimated fair value | 174,818 | 177,952
Amortized Cost | 302,515 | 303,493
Estimated Fair Value | 274,568 | 277,003
U.S. Government agencies |  |
Available-for-Sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 70 | 102
Investment securities not due at a single maturity date, estimated fair value | 65 | 95
Amortized Cost | 70 | 102
Estimated Fair Value | 65 | 95
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  |
Available-for-Sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 76,732 | 88,874
Investment securities not due at a single maturity date, estimated fair value | 72,302 | 83,352
Amortized Cost | 76,732 | 88,874
Estimated Fair Value | 72,302 | 83,352
Held-to-Maturity Securities |  |
Investment securities not due at a single maturity date, amortized cost | 11,095 | 10,758
Investment securities not due at a single maturity date, estimated fair value | 8,995 | 9,066
Amortized Cost | 11,095 | 10,758
Estimated Fair Value | 8,995 | 9,066
Private label residential mortgage and asset backed securities |  |
Available-for-Sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 265,302 | 372,610
Investment securities not due at a single maturity date, estimated fair value | 230,555 | 324,573
Amortized Cost | 265,302 | 372,610
Estimated Fair Value | 230,555 | 324,573
Held-to-Maturity Securities |  |
Investment securities not due at a single maturity date, amortized cost | 53,066 | 54,579
Investment securities not due at a single maturity date, estimated fair value | 47,433 | 48,635
Amortized Cost | 53,066 | 54,579
Estimated Fair Value | 47,433 | 48,635
Corporate debt securities |  |
Available-for-Sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 470 | 0
Investment securities not due at a single maturity date, estimated fair value | 493 | 0
Amortized Cost | 470 |
Estimated Fair Value | 493 |
Held-to-Maturity Securities |  |
Investment securities not due at a single maturity date, amortized cost | 46,198 | 46,086
Investment securities not due at a single maturity date, estimated fair value | 43,322 | 41,350
Amortized Cost | 46,198 | 46,086
Estimated Fair Value | $ 43,322 | $ 41,350

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