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LOANS AND ALLOWANCE FOR LOAN LOSSES - Allowance for loan losses and the recorded investment by portfolio segment and based on impairment method - (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for loan losses        
Ending Balance individually evaluated for impairment $ 3,461 $ 1,800 $ 1,429  
Ending Balance collectively evaluated for impairment 19,082 20,699    
Total ending allowance balance 22,543 22,499 22,020 $ 23,250
Loans        
Ending Balance individually evaluated for impairment 18,811 21,197    
Ending Balance collectively evaluated for impairment 3,035,009 2,621,522    
Ending Balance acquired with deteriorated credit quality 9,643 8,954    
Total 3,063,463 2,651,673    
Interest Receivable 9,095 7,342    
Allowance that includes a probability of default for subject loans 1,174 2,697    
Commercial        
Allowance for loan losses        
Ending Balance individually evaluated for impairment 2,457 898    
Ending Balance collectively evaluated for impairment 8,776 8,756    
Total ending allowance balance 11,233 9,654 6,511 2,977
Loans        
Ending Balance individually evaluated for impairment 3,461 2,705    
Ending Balance collectively evaluated for impairment 575,530 531,854    
Total 578,991 534,559    
Commercial real estate        
Allowance for loan losses        
Ending Balance individually evaluated for impairment 862 755    
Ending Balance collectively evaluated for impairment 5,567 6,951    
Total ending allowance balance 6,429 7,706 10,702 15,605
Loans        
Ending Balance individually evaluated for impairment 5,737 7,904    
Ending Balance collectively evaluated for impairment 1,423,353 1,147,536    
Ending Balance acquired with deteriorated credit quality 8,385 7,256    
Total 1,437,475 1,162,696    
Residential        
Allowance for loan losses        
Ending Balance individually evaluated for impairment 142 147    
Ending Balance collectively evaluated for impairment 3,719 4,100    
Total ending allowance balance 3,861 4,247 3,859 3,501
Loans        
Ending Balance individually evaluated for impairment 8,640 10,458    
Ending Balance collectively evaluated for impairment 970,273 880,357    
Ending Balance acquired with deteriorated credit quality 1,258 1,698    
Total 980,171 892,513    
Consumer        
Allowance for loan losses        
Ending Balance collectively evaluated for impairment 1,020 892    
Total ending allowance balance 1,020 892 $ 948 $ 1,167
Loans        
Ending Balance individually evaluated for impairment 973 130    
Ending Balance collectively evaluated for impairment 65,853 61,775    
Total $ 66,826 $ 61,905