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CAPITAL REQUIREMENT (Details)
Sep. 30, 2016
Dec. 31, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital ratio, minimum capital ratios 8.00% 8.00%
Total capital ratio, well-capitalized ratios 10.00% 10.00%
Total capital ratio, minimum capital requirements including fully-phased in capital conservation buffer (2019) 10.50% 10.50%
Tier 1 risk-based capital ratio, minimum capital ratios 6.00% 6.00%
Tier 1 risk-based capital ratio, well-capitalized ratios 8.00% 8.00%
Tier 1 risk-based capital ratio, minimum capital requirements including fully-phased in capital conservation buffer (2019) 8.50% 8.50%
Common Equity Tier 1 ratio, minimum capital ratios 4.50% 4.50%
Common Equity Tier 1 ratio, well-capitalized ratios 6.50% 6.50%
Common Equity Tier 1 ratio, minimum capital requirements including fully-phased in capital conservation buffer (2019) 7.00% 7.00%
Tier 1 leverage ratio, minimum capital ratios 4.00% 4.00%
Tier 1 leverage ratio, well-capitalized ratios 5.00% 5.00%
CWB [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital ratio 13.08% 13.70%
Tier 1 risk-based capital ratio 11.83% 12.45%
Common Equity Tier 1 ratio 11.83% 12.45%
Tier 1 leverage ratio 10.48% 10.38%