Loans Receivable and The Allowance For Loan Losses: Schedule of Age Analysis of Past Due Loans (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Consumer
30-59 Days Past Due	$ 312	$ 670
60-89 Days Past Due	582	363
Greater Than 90 Days Past Due	744	769
Total Past Due	1,638	1,802
Current	101,866	101,545
Total Loans Aging	103,504	103,347
Loans 90 Days or More Past Due and Accruing	39	25
Consumer secured by one- to four-family
30-59 Days Past Due	903	1,072
60-89 Days Past Due	638	109
Greater Than 90 Days Past Due	962	1,374
Total Past Due	2,503	2,555
Current	171,228	178,494
Total Loans Aging	173,731	181,049
Loans 90 Days or More Past Due and Accruing		148
Total Loans by Age Analysis
30-59 Days Past Due	4,706	7,886
60-89 Days Past Due	2,079	7,930
Greater Than 90 Days Past Due	27,716	53,401
Total Past Due	34,501	69,217
Current	3,177,756	3,227,121
Total Loans Aging	3,212,257	3,296,338
Loans 90 Days or More Past Due and Accruing	2,181	2,324
Commercial real estate owner occupied
30-59 Days Past Due	2,139	1,251
60-89 Days Past Due		2,703
Greater Than 90 Days Past Due	3,101	3,462
Total Past Due	5,240	7,416
Current	472,381	462,390
Total Loans Aging	477,621	469,806
Commercial real estate investment properties
60-89 Days Past Due	99
Greater Than 90 Days Past Due	2,644	3,087
Total Past Due	2,743	3,087
Current	611,222	618,535
Total Loans Aging	613,965	621,622
Multifamily real estate
Current	130,319	139,710
Total Loans Aging	130,319	139,710
Commercial construction
Greater Than 90 Days Past Due		949
Total Past Due		949
Current	23,808	41,442
Total Loans Aging	23,808	42,391
Multifamily construction
Current	18,132	19,436
Total Loans Aging	18,132	19,436
One- to four-family construction
30-59 Days Past Due	238	643
Greater Than 90 Days Past Due	634	3,819
Total Past Due	872	4,462
Current	156,429	139,715
Total Loans Aging	157,301	144,177
Land development residential
30-59 Days Past Due		638
Greater Than 90 Days Past Due	3,300	15,919
Total Past Due	3,300	16,557
Current	79,885	80,934
Total Loans Aging	83,185	97,491
Land development commercial
30-59 Days Past Due		308
Greater Than 90 Days Past Due	337	791
Total Past Due	337	1,099
Current	11,114	14,098
Total Loans Aging	11,451	15,197
Commercial business
30-59 Days Past Due	609	2,411
60-89 Days Past Due	345	4,170
Greater Than 90 Days Past Due	3,320	5,612
Total Past Due	4,274	12,193
Current	595,772	589,247
Total Loans Aging	600,046	601,440
Loans 90 Days or More Past Due and Accruing		4
Agricultural business
30-59 Days Past Due		99
Greater Than 90 Days Past Due	991	1,849
Total Past Due	991	1,948
Current	210,714	216,223
Total Loans Aging	211,705	218,171
One- to four-family residential
30-59 Days Past Due	505	794
60-89 Days Past Due	415	585
Greater Than 90 Days Past Due	11,683	15,770
Total Past Due	12,603	17,149
Current	594,886	625,352
Total Loans Aging	607,489	642,501
Loans 90 Days or More Past Due and Accruing	$ 2,142	$ 2,147