LOANS AND LEASES - Changes in Other Real Estate Owned (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
FDIC indemnification asset	$ 8,200		$ 8,200		$ 12,000
Balance at beginning of period	5,961	$ 10,031	6,284	$ 13,254
Additions	1,794	1,239	4,044	2,418
Disposals	(4,505)	(2,736)	(6,797)	(6,908)
Write-downs	134	228	415	458
Balance at end of period	3,116	8,306	3,116	8,306
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Additions	1,559	936	1,731	1,824
Disposals	(3,684)	(2,670)	(5,291)	(4,763)
Write-downs	102	186	264	332
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Additions	235	303	2,313	594
Disposals	(821)	(66)	(1,506)	(2,145)
Write-downs	$ 32	$ 42	$ 151	$ 126