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SHAREHOLDERS’ EQUITY AND EARNINGS PER COMMON SHARE - Changes in AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | $ 354,641 | $ 156,740 | $ 154,152
Other comprehensive gain (loss) before reclassifications | (6,998) | (229) | (5,049)
Less: amounts reclassified from accumulated other comprehensive income | (730) | (1) | 2,906
Total other comprehensive loss | (6,268) | (228) | (7,955)
Balance at end of period | 370,579 | 354,641 | 156,740
Net unrealized loss on AFS securities |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (1,713) | (2,125) | 5,713
Other comprehensive gain (loss) before reclassifications | (7,293) | 424 | (4,914)
Less: amounts reclassified from accumulated other comprehensive income | (708) | 12 | 2,924
Total other comprehensive loss | (6,585) | 412 | (7,838)
Balance at end of period | (8,665) | (1,713) | (2,125)
Net unrealized loss on derivative hedges |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (2,250) | (1,798) | (1,621)
Other comprehensive gain (loss) before reclassifications | 486 | (452) | (177)
Less: amounts reclassified from accumulated other comprehensive income | 0 | 0 | 0
Total other comprehensive loss | 486 | (452) | (177)
Balance at end of period | (2,249) | (2,250) | (1,798)
Net unrealized loss on post-retirement plans |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (591) | (403) | (463)
Other comprehensive gain (loss) before reclassifications | (191) | (201) | 42
Less: amounts reclassified from accumulated other comprehensive income | (22) | (13) | (18)
Total other comprehensive loss | (169) | (188) | 60
Balance at end of period | (888) | (591) | (403)
Accumulated other comprehensive (loss) income |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (4,554) | (4,326) | 3,629
Total other comprehensive loss | (6,268) | (228) | (7,955)
Balance at end of period | (11,802) | $ (4,554) | $ (4,326)
Accounting Standards Update 2018-02 |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Less: amounts reclassified from accumulated other comprehensive income | (980) |  |
Accounting Standards Update 2018-02 | Net unrealized loss on AFS securities |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Less: amounts reclassified from accumulated other comprehensive income | (367) |  |
Accounting Standards Update 2018-02 | Net unrealized loss on derivative hedges |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Less: amounts reclassified from accumulated other comprehensive income | (485) |  |
Accounting Standards Update 2018-02 | Net unrealized loss on post-retirement plans |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Less: amounts reclassified from accumulated other comprehensive income | $ (128) |  |

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