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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Changes in AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | $ 354,641 | $ 156,740
Other comprehensive (loss) gain before reclassifications | $ (2,184) | $ 1,957 | (9,813) | 2,621
Less: amounts reclassified from accumulated other comprehensive income | 0 | 0 | 0 | 0
Total other comprehensive (loss) income | (2,184) | 1,957 | (9,813) | 2,621
Less: amounts reclassified from accumulated other comprehensive income for ASU 2018-02 |  |  | 0 |
Balance at end of period | 355,963 | 347,122 | 355,963 | 347,122
Net unrealized loss on AFS securities |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (10,239) | (1,357) | (1,713) | (2,125)
Other comprehensive (loss) gain before reclassifications | (2,356) | 2,193 | (10,515) | 2,961
Less: amounts reclassified from accumulated other comprehensive income | 0 | 0 | 0 | 0
Total other comprehensive (loss) income | (2,356) | 2,193 | (10,515) | 2,961
Balance at end of period | (12,595) | 836 | (12,595) | 836
Net unrealized loss on effective cash flow hedging derivatives |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (2,236) | (1,938) | (2,250) | (1,798)
Other comprehensive (loss) gain before reclassifications | 172 | (239) | 671 | (379)
Less: amounts reclassified from accumulated other comprehensive income | 0 | 0 | 0 | 0
Total other comprehensive (loss) income | 172 | (239) | 671 | (379)
Balance at end of period | (2,064) | (2,177) | (2,064) | (2,177)
Net unrealized loss on post-retirement plans |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (688) | (367) | (591) | (403)
Other comprehensive (loss) gain before reclassifications | 0 | 3 | 31 | 39
Less: amounts reclassified from accumulated other comprehensive income | 0 | 0 | 0 | 0
Total other comprehensive (loss) income | 0 | 3 | 31 | 39
Balance at end of period | (688) | (364) | (688) | (364)
Accumulated other comprehensive (loss) income |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (13,163) | (3,662) | (4,554) | (4,326)
Total other comprehensive (loss) income |  |  | (9,813) | 2,621
Less: amounts reclassified from accumulated other comprehensive income for ASU 2018-02 |  |  | (980) |
Balance at end of period | $ (15,347) | $ (1,705) | (15,347) | $ (1,705)
Accounting Standards Update 2018-02 |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Less: amounts reclassified from accumulated other comprehensive income for ASU 2018-02 |  |  | (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 for ASU 2018-02 |  |  | (367) |
Accounting Standards Update 2018-02 | Net unrealized loss on effective cash flow hedging derivatives |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Less: amounts reclassified from accumulated other comprehensive income for ASU 2018-02 |  |  | (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 for ASU 2018-02 |  |  | $ (128) |

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- Definition Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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