LOAN PORTFOLIO - Change in Accretable Yield of Purchased Credit Impaired Loans (Detail) - Financial Asset Acquired with Credit Deterioration [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of year	$ 103,682	$ 116,462	$ 118,385
Accretion recognized in earnings	(10,189)	(10,810)	(11,533)
Reclassification (to) from non-accretable	0	(1,970)	9,610
Balance at end of period	$ 93,493	$ 103,682	$ 116,462