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FAIR VALUES OF FINANCIAL INSTRUMENTS - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Valuation allowance for other real estate owned	$ 0	$ 22
Alternative investments liquidation period	10 years
Affordable Housing Fund Investment
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Alternative investments unfunded investment commitments	$ 377
Small Business Investment Companies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Alternative investments unfunded investment commitments	13,400
Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Alternative investments unfunded investment commitments	$ 2,000
Agency mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Expected loss rate	1.73%		1.85%

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- Definition

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- Definition

Amount of expense recognized in the income statement for a decrease in valuation of real estate owned (REO).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(4))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Percentage of contractually collectible principal associated with a financial asset expected not to be collected due to default by the borrower.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122596-111746

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