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Investment Securities - Amortized cost and estimated fair value (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Carrying Value |  |
Due within one year or less | $ 8,161 |
Due after one year through five years | 47,376 |
Due after five years through ten years | 57,248 |
Due after 10 years | 12,186 |
Held-to-maturity securities carrying value | 124,971 |
Amortized Cost | 292,139 | $ 299,728
Estimated Fair Value |  |
Due within one year or less | 7,974 |
Due after one year through five years | 43,614 |
Due after five years through ten years | 49,662 |
Due after 10 years | 10,736 |
Total investment securities | 111,986 |
Debt Securities, Held-to-maturity, Fair Value, Total | 249,807 | 258,617
Amortized Cost |  |
Due after one year through five years | 473 |
Due after five years through ten years | 59,467 |
Due after 10 years | 384 |
Total investment securities available-for-sale | 60,324 |
Total investment securities, Amortized Cost | 573,733 | 584,754
Fair Value |  |
Due after one year through five years | 470 |
Due after five years through ten years | 50,524 |
Due after 10 years | 385 |
Total investment securities available-for-sale | 51,379 |
Debt Securities, Available-for-sale, Total | 472,272 | 486,736
Mortgage backed securities - Residential agency |  |
Carrying Value |  |
Mortgage-backed securities, Carrying value | 167,168 |
Amortized Cost | 167,168 | 170,125
Estimated Fair Value |  |
Mortgage-backed securities, Fair value | 137,821 |
Debt Securities, Held-to-maturity, Fair Value, Total | 137,821 | 141,627
Amortized Cost |  |
Mortgage-backed securities, Amortized Cost | 513,409 |
Fair Value |  |
Mortgage-backed securities, Fair value | 420,893 |
Debt Securities, Available-for-sale, Total | $ 420,893 | $ 435,594

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