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FAIR VALUE - Narrative (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of investment $ 465,844,000 $ 415,308,000  
Purchase of investment 226,014,000 203,719,000 $ 108,448,000
Specific charges to value the real estate owned 0 0  
Change in fair value of foreclosed real estate 0 0 43,000
Impaired loans      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Changes in fair value of impaired loans and foreclosed real estate 146,000 867,000 $ 268,000
Fair Value, Measurements, Recurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value liabilities   0  
Fair value of investment 465,844,000 415,308,000  
Fair Value, Measurements, Nonrecurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Allowance for loan losses or partial charge-offs 928,000 2,266,000  
Private label commercial CMOs      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of investment 7,209,000    
Purchase of investment 7,213,000    
Premium amortization 41,000    
Unrealized gain 37,000    
Private label commercial CMOs | Fair Value, Measurements, Recurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of investment $ 75,045,000 $ 7,653,000