GOODWILL AND OTHER INTANGIBLE ASSETS (Identifiable Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 79,090		$ 79,090
Accumulated Amortization	56,302		55,270
Total	1,032	1,058
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	27,801		27,801
Accumulated Amortization	22,875		22,782
Total	93	137
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	49,639		49,639
Accumulated Amortization	32,647		31,821
Total	826	834
Non-Solicitation Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,650		1,650
Accumulated Amortization	780		667
Total	113	87
Trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 688		$ 688