Loans Receivable and The Allowance For Loan Losses: Schedule of Loans Receivable with Fixed- and Adjustable-Rates of Interest (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Total Fix Rate and Adjustable Rate Loans
Loans Receivable with Adjustable Rate of Interest	$ 3,212,257	$ 3,296,338	$ 3,306,667
Due in one year or less
Loans Receivable with Fixed Rates of Interest	233,525	216,782	191,252
Loans Receivable with Adjustable Rate of Interest	1,193,230	1,200,182	1,221,511
Due After One Year Through Three Years
Loans Receivable with Fixed Rates of Interest	223,624	250,715	245,203
Loans Receivable with Adjustable Rate of Interest	322,336	425,309	435,987
Due After Three Years Through Five Years
Loans Receivable with Fixed Rates of Interest	161,094	182,647	189,938
Loans Receivable with Adjustable Rate of Interest	408,015	336,382	331,136
Due after five years through ten years
Loans Receivable with Fixed Rates of Interest	155,490	157,559	143,647
Loans Receivable with Adjustable Rate of Interest	38,782	23,618	35,354
Due After Ten Years
Loans Receivable with Fixed Rates of Interest	474,366	502,196	512,639
Loans Receivable with Adjustable Rate of Interest	1,795	948
Total Fixed Rate Loans
Loans Receivable with Fixed Rates of Interest	1,248,099	1,309,899	1,282,679
Total Adjustable Rate Loans
Loans Receivable with Adjustable Rate of Interest	$ 1,964,158	$ 1,986,439	$ 2,023,988