PREMISES AND EQUIPMEN, NET (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	$ 59,873,000	$ 62,448,000
Less: accumulated depreciation and amortization	(40,370,000)	(39,380,000)
Premises and equipment, net	19,503,000	23,068,000
Depreciation and amortization expense	5,400,000	5,400,000	5,100,000
Estimated Lease Payments
2013	14,762,000
2014	13,671,000
2015	11,147,000
2016	8,695,000
2017	6,318,000
Thereafter	12,567,000
Total	67,160,000
Gross rental expense	16,800,000	16,700,000	16,800,000
Total rental income	505,000	587,000	518,000
Future minimum rental payments to be received under noncancelable subleases	2,600,000
Land
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	2,027,000	3,537,000
Buildings
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	5,578,000	5,815,000
Furniture, fixtures and equipment
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	28,272,000	29,466,000
Leasehold improvements
PREMISES AND EQUIPMENT, NET
Premises and equipment, gross	$ 23,996,000	$ 23,630,000