LOANS AND ALLOWANCE FOR LOAN LOSSES - Impaired Loans Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) relationship property method loan	Dec. 31, 2015 USD ($)	Dec. 31, 2013 USD ($)
Financing Receivable, Impaired [Line Items]
Total valuation methods used on impaired loans | method	3
Total impaired loans, recorded investment	$ 12,152	$ 15,375
Loans identified as impaired, remaining loans	$ 8,800	9,300
Number of Impaired Installment Loans | loan	2
Investment in loans in the process of foreclosure	$ 59
Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Impaired loan repurchased by selling financial institution	5,000
Decrease in impaired loans	$ 5,000
Commercial
Financing Receivable, Impaired [Line Items]
Number of loan relationships causing increase in impaired loans | relationship	4
Total impaired loans, recorded investment	$ 10,781	14,177
Charge-offs incurred on largest impaired loan	$ 759
Number of loan relationships causing increase in impaired loans | loan	13
Loans identified as impaired, remaining loans	$ 3,900
Increase in impaired loans specific to relationships generating increases	1,200
Impaired loans, principal curtailment	796
Decrease in impaired loans specific to relationships generating decreases	3,400
Decrease in impaired loans from other factors	200
Commercial | Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Total impaired loans, recorded investment	3,649	7,587
Loan identified as impaired, largest loan	950
Impaired financing receivable participation, largest loan	361
Charge-offs incurred on largest impaired loan	$ 701
Residential
Financing Receivable, Impaired [Line Items]
Decrease in impaired loans	52.00%
Total impaired loans, recorded investment	$ 1,161	1,067
Number foreclosed properties held | property	2
Foreclosed properties held	$ 214
Consumer
Financing Receivable, Impaired [Line Items]
Total impaired loans, recorded investment	$ 78	$ 103
Number of additional collateralized loans in the process of foreclosure | loan	6
Investment in loans in the process of foreclosure	$ 464
Total Recorded Investment In Impaired Financing Receivables | Government Contracts Concentration Risk
Financing Receivable, Impaired [Line Items]
Total impaired loans, recorded investment			$ 5,000
Total Recorded Investment In Impaired Financing Receivables | Credit Concentration Risk
Financing Receivable, Impaired [Line Items]
Decrease in impaired loans	$ 3,200
Decrease in impaired loans	21.00%
Number of loan relationships causing increase in impaired loans | relationship	7
Number of Loan Relationships Causing Increase in Impaired Loans | relationship	5