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SECURITIES - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
OTTI, Sales and Calls, Pledged, Trading and Restricted Securities |  |  |  |
Guaranteed portion of student loan backed bonds |  | student loan backed bonds, which are guaranteed by the U.S. Department of Education for 97% to 100% of principal |  |
Credit support for student loan backed bonds description |  | the bonds have credit support of 3% to 5% |  |
Gross gains realized on sale of securities available for sale |  |  | $ 7,900 |
Proceeds from sales of securities available for sale |  | $ 46,478 | 230,372 | $ 52,367
Gross gains realized on sale of securities available for sale |  |  |  | 300
Gross losses realized on sale of securities available for sale |  |  |  | (300)
Debt and Equity Securities, Gain (Loss) | $ (7,900) | 201 | (7,921) | $ 38
Proceeds from calls of securities |  | 20,300 | 3,300 |
Fair value of securities pledged to secure public deposits and FHLB and FRB overnight borrowings |  | 402,200 | 354,300 |
Trading securities |  | $ 0 | $ 0 |
Threshold for disclosure percentage |  | 10.00% | 10.00% |
Amount owned in FHLB, ACBB and FRB stock |  | $ 32,879 | $ 24,028 |

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