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SECURITIES (Detail Textuals) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other-Than-Temporary-Impairment |  |  |
Proceeds from sales of securities available for sale | $ 52,367 | $ 264,358 | $ 75,750
Gross gains realized on sale of securities available for sale | 300 | 1,600 | 500
Gross losses realized on sale of securities available for sale | 300 | 1,200 | $ 500
Securities, restricted | 35,349 | 34,743 |
Fair value of securities pledged to secure public deposits and FHLB and FRB overnight borrowings | $ 513,500 | $ 570,100 |
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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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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