CASH AND SECURITIES (Textuals) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 security	Dec. 31, 2011 security	Dec. 31, 2010 security
Cash and Cash Equivalents [Abstract]
Required cash reserve	$ 25,400,000	$ 20,400,000
Trading Securities [Abstract]
Trading securities, number of securities sold	8	0	0
Trading securites, proceeds from sale	5,073,000	0	0
Trading securities, realized gain	13,000
Trading securities, OTTI charges	409,000	0	1,200,000
Trading securities, number of securities in nonaccrual status	0	0
Trading securities, unrealized holding gain	6,300,000	754,000	497,000
Available-for-sale Securities [Abstract]
Available-for-sale securities, number of securities sold	3	4	1
Available-for-sale securities, sale proceeds	13,000,000	28,000,000	2,000,000
Available-for-sale securities, OTTI charges	0	0	0
Available-for-sale securities, gross realized gain (loss)	38,000	5,000	36,000
Available-for-sale securities, unrealized loss position, number of securities	52	26	24
Held-to-maturity Securities [Abstract]
Held-to-maturity securities, number of securities sold	0	0	0
Held-to-maturity securities, OTTI charge (recovery)	0	(3,000,000)	3,000,000
Held-to-maturity securities, number of securities in nonaccrual status	0	2
Held-to-maturity securities, unrecognized holding loss, number of securties	5	2	13
Securities pledged to secure borrowings	$ 244,100,000