Loans Receivable and The Allowance For Loan Losses: Schedule of Risk-Rated and Non-Risk-Rated Loans by Grade or Other Characteristics (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011
Performing loans
Total Loans by Risk-Rated or Non-Risk-Rated	$ 3,164,895		$ 3,221,026
Non-performing loans
Total Loans by Risk-Rated or Non-Risk-Rated	47,362		75,312
Total risk-rated and non-risk-rated loans
Total Loans by Risk-Rated or Non-Risk-Rated	3,212,257		3,296,338
Pass (Risk ratings 1-5)
Total Loans by Risk-Rated or Non-Risk-Rated	3,006,679	[1]	3,034,355
Special mention
Total Loans by Risk-Rated or Non-Risk-Rated	38,231		53,654
Substandard
Total Loans by Risk-Rated or Non-Risk-Rated	167,033		207,993
Doubtful
Total Loans by Risk-Rated or Non-Risk-Rated	314		336
Total risk-rated loans
Total Loans by Risk-Rated or Non-Risk-Rated	$ 3,212,257		$ 3,296,338

[1] The Pass category includes some performing loans that are part of homogenous pools which are not individually risk-rated. This includes all consumer loans, all one- to four-family residential loans and, in the commercial business category, $67 million of small credit-scored business loans. As loans in these pools become non-performing, they are individually risk-rated.