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REGULATORY CAPITAL (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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The Bank [Member] |  |
Total Capital |  |
Total Capital (to risk-weighted assets) | $ 543,008 | $ 485,252
Total Capital (to risk-weighted assets) ratio | 14.59% | 14.34%
Minimum Capital required to be well-capitalized | $ 372,186 | $ 338,327
Minimum Capital required to be well-capitalized, ratio | 10.00% | 10.00%
Minimum amount of capital for adequacy purposes | $ 297,749 | $ 270,662
Minimum amount of capital for adequacy purposes, ratio | 8.00% | 8.00%
Tier I Capital (to risk-weighted assets) |  |
Tier 1 Capital (to risk-weighted assets) | $ 504,504 | $ 448,812
Tier 1 Capital (to risk-weighted assets) ratio | 13.56% | 13.27%
Minimum Tier 1 Capital required to be well-capitalized | $ 297,749 | $ 270,662
Minimum Tier 1 Capital required to be well-capitalized, ratio | 8.00% | 8.00%
Minimum amount of Tier 1 Capital for adequacy purposes | $ 223,311 | $ 202,996
Minimum amount of Tier 1 Capital for adequacy purposes, ratio | 6.00% | 6.00%
Common equity tier I |  |
Common equity tier 1 (to risk-weighted assets) | $ 504,502 | $ 448,810
Common equity tier I (to risk-weighted assets) ratio | 13.56% | 13.27%
Minimum Common equity tier I required to be well-capitalized | $ 241,921 | $ 219,913
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 | $ 167,484 | $ 152,247
Minimum amount of common equity tier I for adequacy purposes, ratio | 4.50% | 4.50%
Tier I Leverage Capital (to average assets) |  |
Tier 1 Capital(to average assets) | $ 504,504 | $ 448,812
Tier 1 Capital (to average assets) ratio | 11.32% | 10.61%
Minimum Tier 1 Capital required to be well-capitalized | $ 222,912 | $ 211,523
Minimum Tier 1 Capital required to be well-capitalized, ratio | 5.00% | 5.00%
Minimum amount of Tier 1 Capital for adequacy purposes | $ 178,330 | $ 169,219
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 | $ 367,533 | $ 312,953
Minimum amount of capital for adequacy purposes, ratio | 9.875% | 9.25%
Tier I Capital (to risk-weighted assets) |  |
Minimum amount of Tier 1 Capital for adequacy purposes | $ 293,096 | $ 245,287
Minimum amount of Tier 1 Capital for adequacy purposes, ratio | 7.875% | 7.25%
Common equity tier I |  |
Minimum amount of common equity tier I for adequacy purposes | $ 237,268 | $ 194,538
Minimum amount of common equity tier I for adequacy purposes, ratio | 6.375% | 5.75%
Tier I Leverage Capital (to average assets) |  |
Minimum amount of Tier 1 Capital for adequacy purposes | $ 178,330 | $ 169,219
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) | $ 559,937 | $ 502,334
Total Capital (to risk-weighted assets) ratio | 15.03% | 14.84%
Minimum amount of capital for adequacy purposes | $ 298,047 | $ 270,866
Minimum amount of capital for adequacy purposes, ratio | 8.00% | 8.00%
Tier I Capital (to risk-weighted assets) |  |
Tier 1 Capital (to risk-weighted assets) | $ 438,240 | $ 382,870
Tier 1 Capital (to risk-weighted assets) ratio | 11.76% | 11.31%
Minimum amount of Tier 1 Capital for adequacy purposes | $ 223,535 | $ 203,149
Minimum amount of Tier 1 Capital for adequacy purposes, ratio | 6.00% | 6.00%
Common equity tier I |  |
Common equity tier 1 (to risk-weighted assets) | $ 438,238 | $ 382,868
Common equity tier I (to risk-weighted assets) ratio | 11.76% | 11.31%
Minimum amount of common equity tier I for adequacy purposes | $ 167,652 | $ 152,362
Minimum amount of common equity tier I for adequacy purposes, ratio | 4.50% | 4.50%
Tier I Leverage Capital (to average assets) |  |
Tier 1 Capital(to average assets) | $ 438,240 | $ 382,870
Tier 1 Capital (to average assets) ratio | 9.82% | 9.04%
Minimum amount of Tier 1 Capital for adequacy purposes | $ 178,473 | $ 169,318
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 | $ 367,902 | $ 313,189
Minimum amount of capital for adequacy purposes, ratio | 9.875% | 9.25%
Tier I Capital (to risk-weighted assets) |  |
Minimum amount of Tier 1 Capital for adequacy purposes | $ 293,390 | $ 245,472
Minimum amount of Tier 1 Capital for adequacy purposes, ratio | 7.875% | 7.25%
Common equity tier I |  |
Minimum amount of common equity tier I for adequacy purposes | $ 237,506 | $ 194,685
Minimum amount of common equity tier I for adequacy purposes, ratio | 6.375% | 5.75%
Tier I Leverage Capital (to average assets) |  |
Minimum amount of Tier 1 Capital for adequacy purposes | $ 178,473 | $ 169,318
Minimum amount of Tier 1 Capital for adequacy purposes, ratio | 4.00% | 4.00%

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