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INVESTMENT AND MORTGAGE-BACKED SECURITIES, Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Available for sale, Amortized Cost |  |
Within one year | $ 2,123 |
One to five years | 116,049 |
Five to ten years | 183,014 |
Beyond ten years | 5,145 |
Pass-through MBS issued by GSEs and Agency CMO | 844,283 |
Amortized Cost | 1,150,614 | $ 520,261
Available for sale, Fair Value |  |
Within one year | 2,130 |
One to five years | 115,878 |
Five to ten years | 182,961 |
Beyond ten years | 4,995 |
Pass-through MBS issued by GSEs and Agency CMO | 846,529 |
Total | $ 1,152,493 | $ 538,861

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