BORROWINGS (Detail Textuals) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
May 31, 2017
Aug. 31, 2015
Federal Home Loan Bank, Advances [Line Items]          
Aggregate borrowings from FHLB $ 79,942,000 $ 68,022,000 $ 26,841,000    
Federal reserve bank advances          
Federal Home Loan Bank, Advances [Line Items]          
Overnight borrowings   $ 8,100,000      
Interest rate on overnight borrowings   3.00%      
Federal Home Loan Bank Advances          
Federal Home Loan Bank, Advances [Line Items]          
Aggregate borrowings from FHLB   $ 59,922 $ 26,841    
Modified FHLB borrowings       $ 5,000,000 $ 3,500,000
Prepayment penalty       $ 87,000 $ 233,000
Federal Home Loan Bank Advances | Minimum          
Federal Home Loan Bank, Advances [Line Items]          
Interest rates on FHLB advances ranged from   1.53%      
Federal Home Loan Bank Advances | Maximum          
Federal Home Loan Bank, Advances [Line Items]          
Interest rates on FHLB advances ranged from   3.01%      
Federal Home Loan Bank Advances | Weighted average          
Federal Home Loan Bank, Advances [Line Items]          
Interest rates on FHLB advances ranged from   2.52%