DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value of Derivative Instruments (Detail)	Mar. 31, 2018 USD ($) instrument
Derivative [Line Items]
Notional	$ 216,387,000
Total derivatives	(3,181,000)
Designated as Hedging Instrument
Derivative [Line Items]
Notional	75,000,000
Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional	141,387,000
Total derivatives	1,017,000
Other Liabilities | Designated as Hedging Instrument
Derivative [Line Items]
Derivative Liability	$ (4,198,000)
Interest Rate Products | Other Liabilities | Designated as Hedging Instrument
Derivative [Line Items]
Count | instrument	3
Notional	$ 75,000,000
Derivative Liability	(4,198,000)
Interest rate lock commitment with customers | Other Assets | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional	62,920,000
Derivative Asset	929,000
Interest rate lock commitment with customers | Other Liabilities | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional	9,558,000
Derivative Liability	42,000
Forward sale commitments | Other Assets | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional	32,895,000
Derivative Asset	238,000
Forward sale commitments | Other Liabilities | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional	36,014,000
Derivative Liability	$ 108,000