BANK PREMISES AND EQUIPMENT (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Total cost	$ 115,686,000	$ 102,118,000
Accumulated depreciation	(50,736,000)	(46,891,000)
Net bank premises and equipment	64,950,000	55,227,000
Depreciation expense	6,100,000	5,500,000	4,900,000
Land [Member]
Property, Plant and Equipment [Line Items]
Total cost	16,026,000	14,514,000
Bank Premises [Member]
Property, Plant and Equipment [Line Items]
Total cost	32,858,000	24,160,000
Bank Premises [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Bank Premises [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	39 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total cost	20,189,000	19,681,000
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	1 year
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	15 years
Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total cost	$ 46,613,000	$ 43,763,000
Furniture and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	1 year
Furniture and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	10 years