LOANS AND LEASES - Changes in Other Real Estate Owned (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
FDIC indemnification asset	$ 9,600		$ 9,600		$ 12,000
Balance at beginning of period	5,300	$ 11,939	6,284	$ 13,254
Additions	1,963	271	2,250	1,179
Disposals	(1,130)	(2,137)	(2,292)	(4,172)
Write-downs	172	42	281	230
Balance at end of period	5,961	10,031	5,961	10,031
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Additions	50	102	172	888
Disposals	(682)	(1,893)	(1,607)	(2,093)
Write-downs	116	29	162	146
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Additions	1,913	169	2,078	291
Disposals	(448)	(244)	(685)	(2,079)
Write-downs	$ 56	$ 13	$ 119	$ 84