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SECURITIES - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
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% |  |
Proceeds from sales of securities available for sale | $ 0 | $ 0 | $ 46,478 | $ 230,372 |
Gross gains realized on sale of securities available for sale |  |  | 200 | (7,900) |
Debt and Equity Securities, Gain (Loss) |  |  | 201 | (7,921) |
Proceeds from calls of securities | 10,000 | $ 0 | 20,300 | $ 1,900 |
Fair value of securities pledged to secure public deposits and FHLB and FRB overnight borrowings | 292,700 |  | 292,700 |  | $ 354,300
Amount owned in FHLB, ACBB and FRB stock | $ 28,469 |  | $ 28,469 |  | $ 24,028

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