ADDITIONAL INFORMATION REGARDING INTEREST INCOME FROM SECURITIES AND CASH EQUIVALENTS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Interest and Other Income [Abstract]
Mortgage-backed securities interest	$ 4,176	$ 3,455	$ 4,045
Taxable interest income	5,087	6,247	5,091
Tax-exempt interest income	3,577	3,504	3,162
Total income from securities	$ 12,840	$ 13,206	$ 12,298