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OTHER REAL ESTATE OWNED- Other real estate owned (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Other Real Estate And Foreclosed Assets [Line Items]    
Other real estate owned $ 135,218 $ 147,940
Other Real Estate Owned [Member]    
Other Real Estate And Foreclosed Assets [Line Items]    
Other real estate owned 135,218 147,940
Other Real Estate Owned [Member] | Construction    
Other Real Estate And Foreclosed Assets [Line Items]    
Other real estate owned 10,639 10,688
Other Real Estate Owned [Member] | Residential | Mortgage    
Other Real Estate And Foreclosed Assets [Line Items]    
Other real estate owned 49,287 54,381
Other Real Estate Owned [Member] | Commercial    
Other Real Estate And Foreclosed Assets [Line Items]    
Other real estate owned $ 75,292 $ 82,871