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Securities - Amortized Cost and Estimated Fair Value of Investments in Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Available for sale, Amortized Cost |  |
Due in one year or less | $ 299,118 |
Due after one year through five years | 1,564 |
Due after five years through ten years | 32,280 |
Due after ten years | 806,670 |
Total available-for-sale investment securities | 1,139,632 |
MBS: | 269,936 |
Amortized Cost | 1,409,568 | $ 1,387,874
Available for sale, Fair Value |  |
Due in one year or less | 299,208 |
Due after one year through five years | 1,591 |
Due after five years through ten years | 30,881 |
Due after ten years | 750,592 |
Total available-for-sale investment securities | 1,082,272 |
MBS: | 257,549 |
Total | 1,339,821 | 1,299,014
Held to maturity, Amortized Cost |  |
Due in one year or less | 125 |
Due after one year through five years | 20,809 |
Due after five years through ten years | 136,422 |
Due after ten years | 1,027,566 |
Total held-to-maturity investment securities | 1,184,922 |
Mortgage-backed securities | 123,550 |
Amortized cost | 1,308,472 | 1,326,729
Held to maturity, Fair Value |  |
Due in one year or less | 124 |
Due after one year through five years | 20,016 |
Due after five years through ten years | 120,546 |
Due after ten years | 895,239 |
Total held-to-maturity investment securities | 1,035,925 |
Mortgage-backed securities | 112,890 |
Total | $ 1,148,815 | $ 1,149,156

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