PREMISES AND EQUIPMENT - Balance Sheet Components (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment
Gross fixed assets	$ 37,647	$ 38,973
Less: accumulated depreciation and amortization	24,569	23,943
Total net fixed assets	13,078	15,030
Land
Property, Plant and Equipment
Gross fixed assets	332	332
Bank premises
Property, Plant and Equipment
Gross fixed assets	$ 6,799	6,812
Estimated useful life	39 years
Leasehold improvements
Property, Plant and Equipment
Gross fixed assets	$ 10,394	10,789
Furniture, equipment, and software
Property, Plant and Equipment
Gross fixed assets	$ 20,122	$ 21,040
Minimum | Leasehold improvements
Property, Plant and Equipment
Estimated useful life	5 years
Minimum | Furniture, equipment, and software
Property, Plant and Equipment
Estimated useful life	3 years
Maximum | Leasehold improvements
Property, Plant and Equipment
Estimated useful life	20 years
Maximum | Furniture, equipment, and software
Property, Plant and Equipment
Estimated useful life	7 years