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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
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
Dec. 31, 2016
Noninterest income                      
Loan and service fees                 $ 9,291 $ 7,900 $ 7,681
Other income                 2,381 2,598 [1] 2,213 [1]
Total                 40,110 36,009 [1] 32,864 [1]
Noninterest expense                      
Data processing fees and supplies                 9,685 8,233 8,148
Total $ 22,552 $ 22,009 $ 20,274 $ 21,202 $ 19,598 $ 20,269 $ 19,352 $ 20,048 86,037 79,267 72,978
Net income $ 21,363 $ 20,570 $ 20,142 $ 18,336 $ 11,627 $ 15,825 $ 15,364 $ 14,514 80,411 57,330 52,084
Comprehensive income                 $ 75,131 $ 59,047 $ 47,555
Basic earnings per share $ 0.84 $ 0.81 $ 0.80 $ 0.73 $ 0.46 $ 0.63 $ 0.61 $ 0.58 $ 3.18 $ 2.28 $ 2.08
Diluted earnings per share $ 0.83 $ 0.80 $ 0.78 $ 0.71 $ 0.45 $ 0.62 $ 0.60 $ 0.57 $ 3.13 $ 2.23 $ 2.05
As reported [Member]                      
Noninterest income                      
Loan and service fees                 $ 9,291    
Other income                 2,381    
Total                 11,672    
Noninterest expense                      
Data processing fees and supplies                 9,685    
Total                 9,685    
Net Impact                 1,987    
Net income                 80,411    
Comprehensive income                 $ 75,131    
Basic earnings per share                 $ 3.18    
Diluted earnings per share                 $ 3.13    
Under legacy GAAP [Member]                      
Noninterest income                      
Loan and service fees                 $ 8,520    
Other income                 2,625    
Total                 11,145    
Noninterest expense                      
Data processing fees and supplies                 9,158    
Total                 9,158    
Net Impact                 1,987    
Net income                 80,411    
Comprehensive income                 $ 75,131    
Basic earnings per share                 $ 3.18    
Diluted earnings per share                 $ 3.13    
Impact of ASC 606 [Member]                      
Noninterest income                      
Loan and service fees                 $ 771    
Other income                 (244)    
Total                 527    
Noninterest expense                      
Data processing fees and supplies                 527    
Total                 527    
Net Impact                 0    
Net income                 0    
Comprehensive income                 $ 0    
Basic earnings per share                 $ 0    
Diluted earnings per share                 $ 0    
[1] The Company elected the modified retrospective approach of adoption; therefore, prior period balances are presented under legacy GAAP and may not be comparable to current year presentation. As a result of this new standard, the only revenue streams with changes in reporting in the current periods compared to the prior year comparable periods are loan and service fees and other income.