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REGULATORY CAPITAL (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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The Bank [Member] |  |
Total Capital |  |
Total Capital (to risk-weighted assets) | $ 485,252 | $ 392,305
Total Capital (to risk-weighted assets) ratio | 14.34% | 12.87%
Minimum Capital required to be well-capitalized | $ 338,327 | $ 304,758
Minimum Capital required to be well-capitalized, ratio | 10.00% | 10.00%
Minimum amount of capital for adequacy purposes | $ 270,662 | $ 243,806
Minimum amount of capital for adequacy purposes, ratio | 8.00% | 8.00%
Tier 1 Capital (to risk-weighted assets) |  |
Tier 1 Capital (to risk-weighted assets) | $ 448,812 | $ 360,097
Tier 1 Capital (to risk-weighted assets) ratio | 13.27% | 11.82%
Minimum Tier 1 Capital required to be well-capitalized | $ 270,662 | $ 243,806
Minimum Tier 1 Capital required to be well-capitalized, ratio | 8.00% | 8.00%
Minimum amount of Tier 1 Capital for adequacy purposes | $ 202,996 | $ 182,855
Minimum amount of Tier 1 Capital for adequacy purposes, ratio | 6.00% | 6.00%
Common equity tier I |  |
Common equity tier I (to risk-weighted assets) | $ 448,810 | $ 360,094
Common equity tier I (to risk-weighted assets) ratio | 13.27% | 11.82%
Minimum common equity tier I required to be well-capitalized | $ 219,913 | $ 198,093
Minimum common equity tier I required to be well-capitalized, ratio | 6.50% | 6.50%
Minimum amount of common equity tier I for adequacy purposes | $ 152,247 | $ 137,141
Minimum amount of common equity tier I for adequacy purposes, ratio | 4.50% | 4.50%
Tier 1 Leverage Capital (to average assets) |  |
Tier 1 Capital (to average assets) | $ 448,812 | $ 360,097
Tier 1 Capital (to average assets) ratio | 10.61% | 9.31%
Minimum Tier 1 Capital required to be well-capitalized | $ 211,523 | $ 193,430
Minimum Tier 1 Capital required to be well-capitalized, ratio | 5.00% | 5.00%
Minimum amount of Tier 1 Capital for adequacy purposes | $ 169,219 | $ 154,744
Minimum amount of Tier 1 Capital for adequacy purposes, ratio | 4.00% | 4.00%
The Bank [Member] | Conservation Buffer [Member] |  |
Total Capital |  |
Minimum amount of capital for adequacy purposes | $ 312,953 | $ 262,854
Minimum amount of capital for adequacy purposes, ratio | 9.25% | 8.625%
Tier 1 Capital (to risk-weighted assets) |  |
Minimum amount of Tier 1 Capital for adequacy purposes | $ 245,287 | $ 201,902
Minimum amount of Tier 1 Capital for adequacy purposes, ratio | 7.25% | 6.625%
Common equity tier I |  |
Minimum amount of common equity tier I for adequacy purposes | $ 194,538 | $ 156,188
Minimum amount of common equity tier I for adequacy purposes, ratio | 5.75% | 5.125%
Tier 1 Leverage Capital (to average assets) |  |
Minimum amount of Tier 1 Capital for adequacy purposes | $ 169,219 | $ 154,744
Minimum amount of Tier 1 Capital for adequacy purposes, ratio | 4.00% | 4.00%
Parent Company [Member] |  |
Total Capital |  |
Total Capital (to risk-weighted assets) | $ 502,334 | $ 404,017
Total Capital (to risk-weighted assets) ratio | 14.84% | 13.25%
Minimum amount of capital for adequacy purposes | $ 270,866 | $ 243,910
Minimum amount of capital for adequacy purposes, ratio | 8.00% | 8.00%
Tier 1 Capital (to risk-weighted assets) |  |
Tier 1 Capital (to risk-weighted assets) | $ 382,870 | $ 323,045
Tier 1 Capital (to risk-weighted assets) ratio | 11.31% | 10.60%
Minimum amount of Tier 1 Capital for adequacy purposes | $ 203,149 | $ 182,933
Minimum amount of Tier 1 Capital for adequacy purposes, ratio | 6.00% | 6.00%
Common equity tier I |  |
Common equity tier I (to risk-weighted assets) | $ 382,868 | $ 323,042
Common equity tier I (to risk-weighted assets) ratio | 11.31% | 10.60%
Minimum amount of common equity tier I for adequacy purposes | $ 152,362 | $ 137,200
Minimum amount of common equity tier I for adequacy purposes, ratio | 4.50% | 4.50%
Tier 1 Leverage Capital (to average assets) |  |
Tier 1 Capital (to average assets) | $ 382,870 | $ 323,045
Tier 1 Capital (to average assets) ratio | 9.04% | 8.35%
Minimum amount of Tier 1 Capital for adequacy purposes | $ 169,318 | $ 154,788
Minimum amount of Tier 1 Capital for adequacy purposes, ratio | 4.00% | 4.00%
Parent Company [Member] | Conservation Buffer [Member] |  |
Total Capital |  |
Minimum amount of capital for adequacy purposes | $ 313,189 | $ 262,966
Minimum amount of capital for adequacy purposes, ratio | 9.25% | 8.625%
Tier 1 Capital (to risk-weighted assets) |  |
Minimum amount of Tier 1 Capital for adequacy purposes | $ 245,472 | $ 201,988
Minimum amount of Tier 1 Capital for adequacy purposes, ratio | 7.25% | 6.625%
Common equity tier I |  |
Minimum amount of common equity tier I for adequacy purposes | $ 194,685 | $ 156,255
Minimum amount of common equity tier I for adequacy purposes, ratio | 5.75% | 5.125%
Tier 1 Leverage Capital (to average assets) |  |
Minimum amount of Tier 1 Capital for adequacy purposes | $ 169,318 | $ 154,788
Minimum amount of Tier 1 Capital for adequacy purposes, ratio | 4.00% | 4.00%

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