LOANS AND LEASES - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for loan and lease losses covered	$ (1,114,000)	$ (80,000)
Restructured Loans, Nonaccrual Status	7,800,000		$ 5,100,000
Write-downs	109,000	188,000
Gain (loss) on sale of other real estate owned	(24,000)	190,000
Real Estate Acquired Through Foreclosure	5,300,000	11,939,000	6,284,000	$ 13,254,000
FDIC indemnification asset	10,800,000		$ 12,000,000
Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real Estate Acquired Through Foreclosure	500,000	0
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured Loans, Loan Relationships, Review Threshold Amount Minimum	250,000
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured Loans, Loan Relationships, Review Threshold Amount Minimum	100,000
Write-downs	$ 63,000	$ 71,000