OTHER REAL ESTATE OWNED- Other real estate owned (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Other Real Estate And Foreclosed Assets [Line Items]
Other real estate owned	$ 129,716	$ 131,402
Other Real Estate Owned [Member]
Other Real Estate And Foreclosed Assets [Line Items]
Other real estate owned	129,716	131,402
Other Real Estate Owned [Member] | Residential | Other Loans [Member]
Other Real Estate And Foreclosed Assets [Line Items]
Other real estate owned	50,076	49,239
Other Real Estate Owned [Member] | Commercial loans[Member] | Commercial And Industrial Sector [Member] | Mortgage
Other Real Estate And Foreclosed Assets [Line Items]
Other real estate owned	68,904	71,838
Other Real Estate Owned [Member] | Commercial loans[Member] | Construction
Other Real Estate And Foreclosed Assets [Line Items]
Other real estate owned	$ 10,736	$ 10,325