REGULATORY MATTERS, COMMITMENTS AND CONTINGENCIES - Additional Information (Detail) - USD ($)	1 Months Ended		6 Months Ended	12 Months Ended
	Jul. 31, 2013	Feb. 16, 2011	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2016
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Shares Of Preferred Stock Exchanged						1,077,726
Cash dividends declared on preferred stock				$ 223,000	$ 0	$ 0
Proceeds from sale of available-for-sale securities				$ 219,780,000	$ 0	$ 4,861,000
Loans acquired on exchange of loan held for sale		$ 136,100,000
Common Equity Tier 1 Capital Conservation Buffer First Year				0.625%
Threshold For Deposits Insurance Assesment Surcharge							$ 10,000,000,000
Deposits Insurance Surcharge Assesment Base							$ 100
Decrease Increase Federal Deposit Insurance Corporation Premium Expense			$ 1,600,000
Basel III [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Capital Conservation Buffer	2.50%
Common Equity Tier 1 Capital To Risk Weight Assets Ratio	4.50%
Common equity tier 1 capital to risk weight assets ratio plus common equity tier1 capital conservation buffer	7.00%
Total Tier 1 Capital To Risk Weight Assets Ratio	6.00%
Total Tier 1 Capital To Risk Weight Assets Ratio Plus Common Equity Tier 1 Capital Conservation Buffer	8.50%
Total Tier 1 Capital And Tier 2 Capital To Risk Weight Assets Ratio Plus Common Equity Tier 1 Capital Conservation Buffer	10.50%
Leverage Ratio	4.00%
Total Tier1 Capital And Tier 2 Capital To Risk Weight Assets Ratio	8.00%
Cpg Gs [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Cash realized on sale of loan		$ 88,500,000