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REGULATORY CAPITAL (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
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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