LOANS (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]                            
Beginning balance $ 11,680     $ 10,236 $ 9,757       $ 8,590 $ 9,757 $ 8,590      
Charge-offs (1,314)       (186)         (1,559) (1,819)      
Recoveries 29       9         153 57      
Provision (credit) 1,462 $ 614 $ 1,421 638 656 $ 462 $ 1,012 $ 892 563 3,329 2,929      
Ending balance 11,857 11,680     10,236 9,757       11,680 9,757      
Loans:                            
Ending balance: Individually evaluated for impairment                       $ 886 $ 1,101 $ 0
Ending balance: Collectively evaluated for impairment                       10,971 10,579 9,757
Total allowance for loan losses ending balance 11,680 11,680   10,236 9,757 9,757     8,590 9,757 8,590 11,857 11,680 9,757
Loans:                            
Ending balance: Individually evaluated for impairment                       9,549 7,532 12,229
Ending balance: Collectively evaluated for impairment                       863,085 840,899 740,511
Loans and Leases Receivable, Gross                       872,634 848,431 752,740
Commercial Real Estate                            
Allowance for Loan and Lease Losses [Roll Forward]                            
Beginning balance 4,152     4,607 4,483       4,503 4,483 4,503      
Charge-offs 0       0         (670) (1,522)      
Recoveries 0       0         0 0      
Provision (credit) 95       124         339 1,502      
Ending balance 4,247 4,152     4,607 4,483       4,152 4,483      
Loans:                            
Ending balance: Individually evaluated for impairment                       0 62 0
Ending balance: Collectively evaluated for impairment                       4,247 4,090 4,483
Total allowance for loan losses ending balance 4,152 4,152   4,607 4,483 4,483     4,503 4,483 4,503 4,247 4,152 4,483
Loans:                            
Ending balance: Individually evaluated for impairment                       1,838 1,853 8,623
Ending balance: Collectively evaluated for impairment                       371,597 363,014 362,887
Loans and Leases Receivable, Gross                       373,435 364,867 371,510
Commercial                            
Allowance for Loan and Lease Losses [Roll Forward]                            
Beginning balance 5,742     3,668 3,280       2,513 3,280 2,513      
Charge-offs (1,033)       (20)         (190) (107)      
Recoveries 10       1         87 45      
Provision (credit) 1,027       407         2,565 829      
Ending balance 5,746 5,742     3,668 3,280       5,742 3,280      
Loans:                            
Ending balance: Individually evaluated for impairment                       886 1,039 0
Ending balance: Collectively evaluated for impairment                       4,860 4,703 3,280
Total allowance for loan losses ending balance 5,742 5,742   3,668 3,280 3,280     2,513 3,280 2,513 5,746 5,742 3,280
Loans:                            
Ending balance: Individually evaluated for impairment                       7,328 5,291 3,202
Ending balance: Collectively evaluated for impairment                       375,222 356,491 237,021
Loans and Leases Receivable, Gross                       382,550 361,782 240,223
Residential Real Estate                            
Allowance for Loan and Lease Losses [Roll Forward]                            
Beginning balance 251     292 300       328 300 328      
Charge-offs 0       0         0 0      
Recoveries 0       0         2 0      
Provision (credit) (11)       (8)         (51) (28)      
Ending balance 240 251     292 300       251 300      
Loans:                            
Ending balance: Individually evaluated for impairment                       0 0 0
Ending balance: Collectively evaluated for impairment                       240 251 300
Total allowance for loan losses ending balance 251 251   292 300 300     328 300 328 240 251 300
Loans:                            
Ending balance: Individually evaluated for impairment                       383 388 404
Ending balance: Collectively evaluated for impairment                       54,515 56,973 67,320
Loans and Leases Receivable, Gross                       54,898 57,361 67,724
Construction and Land Development                            
Allowance for Loan and Lease Losses [Roll Forward]                            
Beginning balance 738     939 965       882 965 882      
Charge-offs 0       0         0 0      
Recoveries 0       0         0 0      
Provision (credit) (4)       (26)         (227) 83      
Ending balance 734 738     939 965       738 965      
Loans:                            
Ending balance: Individually evaluated for impairment                       0 0 0
Ending balance: Collectively evaluated for impairment                       734 738 965
Total allowance for loan losses ending balance 738 738   939 965 965     882 965 882 734 738 965
Loans:                            
Ending balance: Individually evaluated for impairment                       0 0 0
Ending balance: Collectively evaluated for impairment                       42,441 44,606 55,828
Loans and Leases Receivable, Gross                       42,441 44,606 55,828
Consumer                            
Allowance for Loan and Lease Losses [Roll Forward]                            
Beginning balance 710     678 649       279 649 279      
Charge-offs (281)       (166)         (699) (190)      
Recoveries 19       8         64 12      
Provision (credit) 364       187         696 548      
Ending balance 812 710     678 649       710 649      
Loans:                            
Ending balance: Individually evaluated for impairment                       0 0 0
Ending balance: Collectively evaluated for impairment                       812 710 649
Total allowance for loan losses ending balance 710 710   678 649 649     279 649 279 812 710 649
Loans:                            
Ending balance: Individually evaluated for impairment                       0 0 0
Ending balance: Collectively evaluated for impairment                       19,310 19,815 17,455
Loans and Leases Receivable, Gross                       19,310 19,815 17,455
Unallocated                            
Allowance for Loan and Lease Losses [Roll Forward]                            
Beginning balance 87     52 80       85 80 85      
Charge-offs 0       0         0 0      
Recoveries 0       0         0 0      
Provision (credit) (9)       (28)         7 (5)      
Ending balance 78 87     52 80       87 80      
Loans:                            
Ending balance: Individually evaluated for impairment                       0 0 0
Ending balance: Collectively evaluated for impairment                       78 87 80
Total allowance for loan losses ending balance $ 87 $ 87   $ 52 $ 80 $ 80     $ 85 $ 80 $ 85 $ 78 $ 87 $ 80