GOODWILL AND OTHER INTANGIBLE ASSETS (Identifiable Intangible Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 73,269
Accumulated Amortization	53,126	$ 59,233
Gross Carrying Amount		79,090
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	27,801
Accumulated Amortization	23,497	23,269
Gross Carrying Amount		27,801
Customer Relationship Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	43,918
Accumulated Amortization	28,854	34,922
Gross Carrying Amount		49,639
Non-Solicitation Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,550
Accumulated Amortization	775	1,042
Gross Carrying Amount		1,650
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 688
Gross Carrying Amount		$ 688