LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Fixed-rate and Adjustable-Rate Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Fixed-rate (term to maturity):
Due in one year or less	$ 185,379	$ 216,782	$ 194,153
Due after one year through three years	168,307	250,715	237,087
Due after three years through five years	168,348	182,647	170,747
Due after five years through ten years	165,973	157,559	162,461
Due after ten years	456,758	502,196	494,989
Total fixed-rate loans	1,144,765	1,309,899	1,259,437
Adjustable-Rate (term to rate adjustment):
Due in one year or less	1,283,783	1,200,182	1,172,572
Due after one year through three years	291,778	425,309	431,373
Due after three years through five years	441,773	336,382	336,984
Due after five years through ten years	45,951	23,618	23,932
Due after ten years	5,473	948	948
Total adjustable-rate loans	2,068,758	1,986,439	1,965,809
Total loans outstanding	$ 3,213,523	$ 3,296,338	$ 3,225,246