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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Basic earnings per share computation [Abstract]                      
Net income applicable to common stock $ 6,944 $ 7,064 $ 6,647 $ 8,463 $ 7,227 $ 8,007 $ 5,338 $ 4,531 $ 29,118 $ 25,103 $ 19,490
Weighted average common shares outstanding (in shares)                 3,945,299 3,844,241 3,597,709
Earnings per share - basic (in dollars per share) $ 1.76 $ 1.79 $ 1.69 $ 2.14 $ 1.83 $ 2.02 $ 1.37 $ 1.26 $ 7.38 $ 6.53 $ 5.42
Diluted earnings per share computation [Abstract]                      
Net income applicable to common stock $ 6,944 $ 7,064 $ 6,647 $ 8,463 $ 7,227 $ 8,007 $ 5,338 $ 4,531 $ 29,118 $ 25,103 $ 19,490
Weighted average common shares outstanding for basic earnings per share (in shares)                 3,945,299 3,844,241 3,597,709
Add: Dilutive effects of restricted stock (in shares)                 0 1,841 2,096
Weighted average common shares outstanding for dilutive earnings per share (in shares)                 3,945,299 3,846,082 3,599,805
Earnings per share - dilutive (in dollars per share) $ 1.76 $ 1.79 $ 1.69 $ 2.14 $ 1.83 $ 2.02 $ 1.37 $ 1.26 $ 7.38 $ 6.53 $ 5.41
Restricted Stock [Member]                      
Antidilutive Securities [Abstract]                      
Antidilutive restricted stock excluded from net income per share calculations (in shares)                 5,494 4,302 3,576
Restricted Stock [Member] | Minimum [Member]                      
Antidilutive Securities [Abstract]                      
Antidilutive stock share price range (in dollars per share)                 $ 44.93 $ 58.37 $ 52.44
Restricted Stock [Member] | Maximum [Member]                      
Antidilutive Securities [Abstract]                      
Antidilutive stock share price range (in dollars per share)                 $ 63.19 $ 62.93 $ 62.93