SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Period after which loans are placed on nonaccrual basis	90 days
Period after which loan is returned to accrual status	6 months
Loans and leases receivable, allowance, quantitative threshold for impairment evaluation	$ 500,000	$ 250,000
Minimum | Mortgage Loans Held for Sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Period of time between issuance of loan commitment and closing and sale of loan	10 days
Minimum | Commercial and industrial | Working Capital and Equipment Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, maturity period	1 year
Minimum | Commercial and industrial | Owner Occupied Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, maturity period	5 years
Loan receivable amortization period	15 years
Minimum | Commercial Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, maturity period	3 years
Minimum | Commercial Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, maturity period	1 year
Minimum | Non-Real Estate Secured Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, maturity period	5 years
Maximum | Mortgage Loans Held for Sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Period of time between issuance of loan commitment and closing and sale of loan	60 days
Maximum | SBA Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, maturity period	25 years
Maximum | Commercial and industrial | Working Capital and Equipment Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, maturity period	7 years
Maximum | Commercial and industrial | Owner Occupied Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, maturity period	7 years
Loan receivable amortization period	25 years
Maximum | Commercial Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, maturity period	7 years
Loan receivable amortization period	25 years
Maximum | Commercial Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, maturity period	5 years
Loan receivable amortization period	25 years
Maximum | Commercial Construction | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivable amortization period	1 year 6 months
Maximum | Non-Real Estate Secured Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, maturity period	7 years