LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Fixed-rate and Adjustable-Rate Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Fixed-rate (term to maturity):
Due in one year or less	$ 134,632	$ 183,004	$ 185,379
Due after one year through three years	139,878	171,724	168,307
Due after three years through five years	205,830	173,251	168,348
Due after five years through ten years	208,625	167,858	165,973
Due after ten years	406,715	473,927	456,758
Total fixed-rate loans	1,095,680	1,169,764	1,144,765
Adjustable-Rate (term to rate adjustment):
Due in one year or less	1,290,793	1,260,472	1,283,783
Due after one year through three years	274,789	275,223	291,778
Due after three years through five years	527,999	467,895	441,773
Due after five years through ten years	84,399	60,316	45,951
Due after ten years	1,776	2,044	5,473
Total adjustable-rate loans	2,179,756	2,065,950	2,068,758
Total loans outstanding	$ 3,275,436	$ 3,235,714	$ 3,213,523