ACQUISITIONS, Intangible Asset, Goodwill and Acquisition-related Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Summary of loans acquired [Abstract]
Merger and acquisition integration-related expenses	$ 7,037	$ 123	$ 2,181
Core Deposits [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	7 years
Core Deposits [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	20 years
Bank of America Agreement [Member] | Core Deposits [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	8 years
Bank of America Agreement [Member] | Core Deposits [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	10 years
Bank of America Agreement [Member] | Other Intangibles [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	8 years
Bank of America Agreement [Member] | Other Intangibles [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	10 years