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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 | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 01, 2018
Changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward] |  |  |  |  |  |
Beginning balances |  | $ 171,534 | $ 150,262 | $ 165,029 | $ 149,813 |
Cumulative effect of account change | [1] |  |  |  |  | $ (162)
Balances, as adjusted |  |  |  |  |  | 149,651
Other comprehensive income before reclassification |  | 2,891 | (299) | 5,447 | (3,606) |
Amounts reclassified from accumulated other comprehensive income |  | 0 | 14 | 13 | 27 |
Total other comprehensive income (loss) |  | 2,891 | (285) | 5,460 | (3,579) |
Ending balances |  | 178,387 | 151,780 | 178,387 | 151,780 |
Total |  |  |  |  |  |
Changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward] |  |  |  |  |  |
Beginning balances |  | (8,842) | (13,836) | (11,411) | (10,340) |
Cumulative effect of account change | [1] |  |  |  |  | (202)
Balances, as adjusted |  |  |  |  |  | (10,542)
Total other comprehensive income (loss) |  | 2,891 | (285) | 5,460 | (3,579) |
Ending balances |  | (5,951) | (14,121) | (5,951) | (14,121) |
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 |  | (2,090) | (6,924) | (4,646) | (3,415) |
Cumulative effect of account change |  |  |  |  |  | (202)
Balances, as adjusted |  |  |  |  |  | (3,617)
Other comprehensive income before reclassification |  | 2,891 | (299) | 5,447 | (3,606) |
Amounts reclassified from accumulated other comprehensive income |  | (14) | 0 | (14) | 0 |
Total other comprehensive income (loss) |  | 2,877 | (299) | 5,433 | (3,606) |
Ending balances |  | 787 | (7,223) | 787 | (7,223) |
Defined Benefit and Other Benefit Plans |  |  |  |  |  |
Changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward] |  |  |  |  |  |
Beginning balances |  | (6,752) | (6,912) | (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 |  | 14 | 14 | 27 | 27 |
Total other comprehensive income (loss) |  | 14 | 14 | 27 | 27 |
Ending balances |  | $ (6,738) | $ (6,898) | $ (6,738) | $ (6,898) |
[1] | Due to implementation of ASC 2016-01. See "Adoption of New Accounting Standards" discussion in Note 1.

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