CONSOLIDATED STATEMENTS OF INCOME - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Interest and dividend income:        
Interest and fees on loans $ 11,699 $ 9,276 $ 40,358 $ 32,510
Interest and dividends on securities 404 435 1,669 3,172
Interest on short-term investments 26 42 313 100
Total interest and dividend income 12,129 9,753 42,340 35,782
Interest expense:        
Interest on deposits 1,437 920 4,468 2,944
Interest on borrowings 534 114 745 782
Total interest expense 1,971 1,034 5,213 3,726
Net interest and dividend income 10,158 8,719 37,127 32,056
Provision for loan losses 1,462 656 3,329 2,929
Net interest and dividend income after provision for loan losses 8,696 8,063 33,798 29,127
Noninterest income:        
Gain on sales of securities, net 113     5,912
Bank owned life insurance 177 171 686 645
Other income 15 25 64 87
Total noninterest income 1,046 1,013 4,178 9,955
Noninterest expense:        
Salaries and employee benefits 4,294 4,164 16,801 15,365
Occupancy expense 644 450 1,733 1,839
Equipment expense 106 122 471 587
FDIC assessment     301 309
Data processing 203 204 810 741
Marketing expense 55 53 245 300
Professional fees 422 248 1,223 936
Directors' fees 181 163 620 607
Other 841 972 3,210 3,065
Total noninterest expense 6,746 6,376 25,414 23,749
Income before income tax expense 2,996 2,700 12,562 15,333
Income tax expense 778 678 3,237 7,418
Net income $ 2,218 $ 2,022 $ 9,325 $ 7,915
Earnings per share:        
Basic $ 0.24 $ 0.22 $ 1.01 $ 0.86
Diluted $ 0.24 $ 0.22 $ 1.00 $ 0.86
Weighted Average Shares:        
Basic (in shares) 9,267,106 9,219,865 9,240,086 9,199,274
Diluted (in shares) 9,305,284 9,295,003 9,306,316 9,199,887
Customer service fees on deposit accounts        
Noninterest income:        
Fees and commission     $ 1,435 $ 1,392
Total noninterest income $ 329 $ 362    
Service charges and fees - other        
Noninterest income:        
Fees and commission     $ 1,993 $ 1,919
Total noninterest income $ 412 $ 455