LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Fixed-rate and Adjustable-Rate Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Fixed-rate (term to maturity):
Due in one year or less	$ 145,221	$ 183,004	$ 233,525
Due after one year through three years	167,187	171,724	223,624
Due after three years through five years	201,672	173,251	161,094
Due after five years through ten years	192,594	167,858	155,490
Due after ten years	425,603	473,927	474,366
Total fixed-rate loans	1,132,277	1,169,764	1,248,099
Adjustable-Rate (term to rate adjustment):
Due in one year or less	1,292,387	1,260,472	1,193,230
Due after one year through three years	266,841	275,223	322,336
Due after three years through five years	526,563	467,895	408,015
Due after five years through ten years	69,797	60,316	38,782
Due after ten years	2,336	2,044	1,795
Total adjustable-rate loans	2,157,924	2,065,950	1,964,158
Total loans outstanding	$ 3,290,201	$ 3,235,714	$ 3,212,257