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SECURITIES - Available for Sale Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized Cost, Available for sale: |  |
Within one year | $ 4,133 |
One to five years | 46,363 |
Five to ten years | 43,556 |
Beyond ten years | 367,539 |
Total | 461,591 | $ 639,463
Estimated Fair Value, Available for sale: |  |
Within one year | 4,138 |
One to five years | 46,402 |
Five to ten years | 43,457 |
Beyond ten years | 372,084 |
Estimated Fair Value | 466,081 | 638,291
U.S. Treasury securities |  |
Amortized Cost, Available for sale: |  |
Total |  | 50,833
Estimated Fair Value, Available for sale: |  |
Estimated Fair Value |  | 50,822
U.S. GSE securities |  |
Amortized Cost, Available for sale: |  |
Total |  | 5,000
Estimated Fair Value, Available for sale: |  |
Estimated Fair Value |  | 4,995
State and municipal obligations |  |
Amortized Cost, Available for sale: |  |
Total | 34,874 | 34,303
Estimated Fair Value, Available for sale: |  |
Estimated Fair Value | 36,504 | 34,964
U.S. GSE residential mortgage-backed securities |  |
Amortized Cost, Available for sale: |  |
Total | 117,323 | 84,550
Estimated Fair Value, Available for sale: |  |
Estimated Fair Value | 118,876 | 84,691
U.S. GSE residential collateralized mortgage obligations |  |
Amortized Cost, Available for sale: |  |
Total | 159,501 | 278,149
Estimated Fair Value, Available for sale: |  |
Estimated Fair Value | 161,582 | 277,851
U.S. GSE commercial mortgage-backed securities |  |
Amortized Cost, Available for sale: |  |
Total | 13,179 | 13,656
Estimated Fair Value, Available for sale: |  |
Estimated Fair Value | 13,368 | 13,609
U.S. GSE commercial collateralized mortgage obligations |  |
Amortized Cost, Available for sale: |  |
Total | 63,464 | 102,722
Estimated Fair Value, Available for sale: |  |
Estimated Fair Value | 64,792 | 104,156
Other asset backed securities |  |
Amortized Cost, Available for sale: |  |
Total | 24,250 | 24,250
Estimated Fair Value, Available for sale: |  |
Estimated Fair Value | 23,894 | 23,401
Corporate bonds |  |
Amortized Cost, Available for sale: |  |
Total | 49,000 | 46,000
Estimated Fair Value, Available for sale: |  |
Estimated Fair Value | $ 47,065 | $ 43,802

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