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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract] |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment securities | $ 2,612 | $ 99 | $ 12,614 | $ 18,951 |  |  |  |
Unrealized gain (loss) on derivatives | 202 | 202 | 607 | 607 |  |  |  |
Retirement obligation | 0 | 0 | 0 | 0 |  |  |  |
Total | 2,814 | 301 | 13,221 | 19,558 |  |  |  |
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract] |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment securities | 276 | 398 | 1,630 | 234 |  |  |  |
Unrealized gain (loss) on derivatives | 0 | 0 | 0 | 0 |  |  |  |
Retirement obligation | (335) | (317) | (1,005) | (951) |  |  |  |
Total | (59) | 81 | 625 | (717) |  |  |  |
Transactions Pre-tax |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment securities | 2,336 | (299) | 10,984 | 18,717 |  |  |  |
Unrealized gain (loss) on derivatives | 202 | 202 | 607 | 607 |  |  |  |
Unfunded pension obligation | 335 | 317 | 1,005 | 951 |  |  |  |
Total | 2,873 | 220 | 12,596 | 20,275 |  |  |  |
Transactions Tax-effect |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment securities | (835) | 137 | (3,920) | (6,644) |  |  |  |
Unrealized gain (loss) on derivatives | (73) | (74) | (222) | (223) |  |  |  |
Retirement obligation | (122) | (117) | (390) | (350) |  |  |  |
Total | (1,030) | (54) | (4,532) | (7,217) |  |  |  |
Transactions Net of tax |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment securities | 1,501 | (162) | 7,064 | 12,073 |  |  |  |
Unrealized gain (loss) on derivatives | 129 | 128 | 385 | 384 |  |  |  |
Retirement obligation | 213 | 200 | 615 | 601 |  |  |  |
Total | 1,843 | 166 | 8,064 | 13,058 |  |  |  |
Balances Net of tax |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment securities | 2,515 | 7,140 | 2,515 | 7,140 | $ 1,014 | $ (4,549) | $ 7,302 | $ (4,933)
Unrealized gain (loss) on cash flow hedges | (706) | (1,215) | (706) | (1,215) | (835) | (1,091) | (1,343) | (1,599)
Retirement obligation | (22,188) | (23,447) | (22,188) | (23,447) | (22,401) | (22,803) | (23,647) | (24,048)
Total | $ (20,379) | $ (17,522) | $ (20,379) | $ (17,522) | $ (22,222) | $ (28,443) | $ (17,688) | $ (30,580)

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- Definition Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e,f) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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