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ACCUMULATED OTHER COMPREHENSIVE LOSS - Summary of Changes in Accumulated Other Comprehensive Income or Loss by Component (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jan. 01, 2018
Changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward] |  |  |  |  |  |
Beginning balances |  | $ 178,387 | $ 151,780 | $ 165,029 | $ 149,813 |
Cumulative effect of account change | [1] |  |  |  |  | $ (162)
Balances, as adjusted |  |  |  |  |  | 149,651
Other comprehensive income before reclassification |  | 2,662 | (1,179) | 8,109 | (4,785) |
Amounts reclassified from accumulated other comprehensive income |  | 13 | 13 | 26 | 40 |
Total other comprehensive income (loss) |  | 2,675 | (1,166) | 8,135 | (4,745) |
Ending balances |  | 182,044 | 156,499 | 182,044 | 156,499 |
Total |  |  |  |  |  |
Changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward] |  |  |  |  |  |
Beginning balances |  | (5,951) | (14,121) | (11,411) | (10,340) |
Cumulative effect of account change | [1] |  |  |  |  | (202)
Balances, as adjusted |  |  |  |  |  | (10,542)
Total other comprehensive income (loss) |  | 2,675 | (1,166) | 8,135 | (4,745) |
Ending balances |  | (3,276) | (15,287) | (3,276) | (15,287) |
Unrealized Gains and Losses on Securities Available for Sale |  |  |  |  |  |
Changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward] |  |  |  |  |  |
Beginning balances |  | 787 | (7,223) | (4,646) | (3,415) |
Cumulative effect of account change |  |  |  |  |  | (202)
Balances, as adjusted |  |  |  |  |  | (3,617)
Other comprehensive income before reclassification |  | 2,662 | (1,179) | 8,109 | (4,785) |
Amounts reclassified from accumulated other comprehensive income |  | 0 | 0 | (14) | 0 |
Total other comprehensive income (loss) |  | 2,662 | (1,179) | 8,095 | (4,785) |
Ending balances |  | 3,449 | (8,402) | 3,449 | (8,402) |
Defined Benefit and Other Benefit Plans |  |  |  |  |  |
Changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward] |  |  |  |  |  |
Beginning balances |  | (6,738) | (6,898) | (6,765) | (6,925) |
Cumulative effect of account change |  |  |  |  |  | 0
Balances, as adjusted |  |  |  |  |  | $ (6,925)
Other comprehensive income before reclassification |  | 0 | 0 | 0 | 0 |
Amounts reclassified from accumulated other comprehensive income |  | 13 | 13 | 40 | 40 |
Total other comprehensive income (loss) |  | 13 | 13 | 40 | 40 |
Ending balances |  | $ (6,725) | $ (6,885) | $ (6,725) | $ (6,885) |
[1] | Due to implementation of ASC 2016-01. See "Adoption of New Accounting Standards" discussion in Note 1.

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