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SECURITIES (Detail Textuals) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Other-Than-Temporary-Impairment |  |  |
Proceeds from sales of securities available for sale | $ 264,358 | $ 75,750 | $ 360,963
Gross gains realized on sale of securities available for sale | 1,600 | 500 | 1,200
Gross losses realized on sale of securities available for sale | 1,200 | 500 | $ 2,300
Securities, restricted | 34,743 | 24,788 |
Fair value of securities pledged to secure public deposits and FHLB and FRB overnight borrowings | $ 570,100 | $ 611,000 |
Threshold for disclosure percentage | 10.00% | 10.00% |
Credit support for student loan backed bonds description | The bonds have credit support of 3% to 5% |  |
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. |  |

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