DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Effect of Derivative Instruments on Statement of Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments Gain Loss [Line Items]
Interest And Fee Income Loans And Leases	$ 553,647	$ 532,684	$ 531,022
Mortgage banking activities	17,228	13,491	20,435
Not Designated as Hedging Instrument, Economic Hedge [Member]
Economic undesignated hedges:
Total gain (loss) on derivatives	46	187	(78)
Not Designated as Hedging Instrument, Economic Hedge [Member] | Sale of TBA GNMA MBS pools
Derivative Instruments Gain Loss [Line Items]
Mortgage banking activities	(371)	189	(78)
Not Designated as Hedging Instrument, Economic Hedge [Member] | Forward loan sales commitments [Member]
Derivative Instruments Gain Loss [Line Items]
Mortgage banking activities	12	0	0
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Rate Lock Commitments [Member]
Derivative Instruments Gain Loss [Line Items]
Mortgage banking activities	383	0	0
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Rate Cap [Member]
Derivative Instruments Gain Loss [Line Items]
Interest And Fee Income Loans And Leases	$ 22	$ (2)	$ 0