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LOANS AND ALLOWANCE - Allowance for loan losses and the recorded investment by portfolio segment and based on impairment method - (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Allowance for loan losses            
Ending Balance individually evaluated for impairment $ 3,778   $ 1,800      
Ending Balance collectively evaluated for impairment 18,765   20,699      
Total ending allowance balance 22,543 $ 22,306 22,499 $ 21,828 $ 21,468 $ 22,020
Loans            
Ending Balance individually evaluated for impairment     21,197      
Ending Balance collectively evaluated for impairment 3,014,743   2,621,522      
Total ending loan balance excluding accrued interest 3,047,250   2,651,673      
Interest Receivable 8,772   7,342      
Excluding loans acquired with deteriorated credit quality            
Allowance for loan losses            
Ending Balance individually evaluated for impairment 3,575   1,800      
Loans            
Ending Balance individually evaluated for impairment 19,697          
Acquired with deteriorated credit quality            
Allowance for loan losses            
Total ending allowance balance 203          
Loans            
Total ending loan balance excluding accrued interest 12,810   8,954      
Commercial            
Allowance for loan losses            
Ending Balance collectively evaluated for impairment 8,101   8,756      
Total ending allowance balance 10,148 9,348 9,654 8,590 6,940 6,511
Loans            
Ending Balance individually evaluated for impairment     2,705      
Ending Balance collectively evaluated for impairment 556,158   531,854      
Total ending loan balance excluding accrued interest 559,995   534,559      
Commercial | Excluding loans acquired with deteriorated credit quality            
Allowance for loan losses            
Ending Balance individually evaluated for impairment 2,047   898      
Loans            
Ending Balance individually evaluated for impairment 3,837          
Commercial real estate            
Allowance for loan losses            
Ending Balance collectively evaluated for impairment 6,023   6,951      
Total ending allowance balance 7,610 7,866 7,706 7,920 8,780 10,702
Loans            
Ending Balance individually evaluated for impairment     7,904      
Ending Balance collectively evaluated for impairment 1,406,948   1,147,536      
Total ending loan balance excluding accrued interest 1,425,275   1,162,696      
Commercial real estate | Excluding loans acquired with deteriorated credit quality            
Allowance for loan losses            
Ending Balance individually evaluated for impairment 1,384   755      
Loans            
Ending Balance individually evaluated for impairment 7,082          
Commercial real estate | Acquired with deteriorated credit quality            
Allowance for loan losses            
Total ending allowance balance 203          
Loans            
Total ending loan balance excluding accrued interest 11,245   7,256      
Residential            
Allowance for loan losses            
Ending Balance collectively evaluated for impairment 3,644   4,100      
Total ending allowance balance 3,788 4,021 4,247 4,404 4,677 3,859
Loans            
Ending Balance individually evaluated for impairment     10,458      
Ending Balance collectively evaluated for impairment 986,113   880,357      
Total ending loan balance excluding accrued interest 995,495   892,513      
Residential | Excluding loans acquired with deteriorated credit quality            
Allowance for loan losses            
Ending Balance individually evaluated for impairment 144   147      
Loans            
Ending Balance individually evaluated for impairment 7,817          
Residential | Acquired with deteriorated credit quality            
Loans            
Total ending loan balance excluding accrued interest 1,565   1,698      
Consumer            
Allowance for loan losses            
Ending Balance collectively evaluated for impairment 997   892      
Total ending allowance balance 997 $ 1,071 892 $ 914 $ 1,071 $ 948
Loans            
Ending Balance individually evaluated for impairment     130      
Ending Balance collectively evaluated for impairment 65,524   61,775      
Total ending loan balance excluding accrued interest 66,485   $ 61,905      
Consumer | Excluding loans acquired with deteriorated credit quality            
Loans            
Ending Balance individually evaluated for impairment $ 961