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Securities - Amortized Cost and Estimated Fair Value of Investments in Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Available for sale, Amortized Cost |  |
Due in one year or less | $ 2,247 |
Due after one year through five years | 24,972 |
Due after five years through ten years | 157,846 |
Due after ten years | 1,573,620 |
Total available-for-sale investment securities | 1,758,685 |
MBS: | 358,912 |
Amortized Cost | 2,117,597 | $ 2,655,594
Available for sale, Fair Value |  |
Due in one year or less | 2,265 |
Due after one year through five years | 25,187 |
Due after five years through ten years | 155,194 |
Due after ten years | 1,524,865 |
Total available-for-sale investment securities | 1,707,511 |
MBS: | 358,473 |
Total | 2,065,984 | 2,764,325
Held to maturity, Amortized Cost |  |
Due in one year or less | 120 |
Due after one year through five years | 529 |
Due after five years through ten years | 139 |
Due after ten years | 385,785 |
Total held-to-maturity investment securities | 386,573 |
Mortgage-backed securities | 87,746 |
Amortized cost | 474,319 |
Held to maturity, Fair Value |  |
Due in one year or less | 120 |
Due after one year through five years | 530 |
Due after five years through ten years | 140 |
Due after ten years | 373,960 |
Total held-to-maturity investment securities | 374,750 |
Mortgage-backed securities | 87,871 |
Total | $ 462,621 | $ 95,235

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