ACQUISITIONS - Granite (Details) - USD ($) $ in Thousands	Jul. 29, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Acquisitions
Goodwill		$ 86,283	$ 82,801	$ 90,851
Granite
Acquisitions
Cash paid at closing	$ 9,600
Granite | Initial purchase price allocation
Acquisitions
Accounts receivable, net		1,024
Prepaid expenses		22
Other assets		25
Premises and equipment, net		299
Non-compete agreements		100
Trademarks and trade names		100
Customer relationships		3,400
Goodwill		4,827
Assets acquired		9,797
Accounts payable and accrued expenses		(57)
Deferred revenue		(192)
Purchase price		9,548
Granite | Adjustments
Acquisitions
Purchase price		$ (100)