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OTHER COMPREHENSIVE INCOME : OTHER COMPREHENSIVE INCOME (LOSS)-Reclassifications (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net securities gains (losses) |  |  |  |  |  |  |  |  |  | $ 17 | $ (3) | $ 423
Income tax expense |  |  |  |  |  |  |  |  |  | (10,392) | (14,189) | (13,767)
NET INCOME |  | $ 7,114 | $ 8,398 | $ 6,923 | $ 7,761 | $ 9,181 | $ 8,272 | $ 8,488 | $ 7,831 | 30,196 | 33,772 | 31,534
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
NET INCOME |  |  |  |  |  |  |  |  |  | (4,909) | (463) | (10,315)
Unrealized Gains and Losses on Available-for-Sale Securities | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net securities gains (losses) |  |  |  |  |  |  |  |  |  | 17 | (3) | 423
Income tax expense |  |  |  |  |  |  |  |  |  | (6) | 1 | (169)
NET INCOME |  |  |  |  |  |  |  |  |  | 11 | (2) | 254
Retirement Plans | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in funded status of post retirement benefits | [1] |  |  |  |  |  |  |  |  | (8,066) | (756) | (17,615)
Income tax expense |  |  |  |  |  |  |  |  |  | 3,146 | 295 | 7,046
NET INCOME |  |  |  |  |  |  |  |  |  | $ (4,920) | $ (461) | $ (10,569)
[1] | Included in the computation of net periodic benefit cost which is included in salaries and benefits. (see Footnote 15 for additional details).

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- Definition The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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