Loans and Allowance For Loan Losses: Schedule of Impaired Loans Average Investment and Interest Income Recognized (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Average Investment in Impaired Loans
One- to four-family residential construction	$ 801	$ 1,882	$ 1,939
Subdivision construction	13,743	8,909	10,154
Land development	10,516	12,751	9,983
Commercial construction	255	617	308
Owner occupied one- to four-family residential	5,156	4,568	4,748
Non-owner occupied one- to four-family residential	11,087	9,944	9,658
Commercial real estate	45,031	26,282	34,403
Other residential	17,252	11,032	9,475
Commercial business	4,245	5,264	4,173
Industrial revenue bonds	3,042	2,163	2,137
Consumer auto	167	262	192
Consumer other	655	579	544
Home equity lines of credit	137	267	227
Total impaired loans	112,087	84,520	87,941
Interest Income Recognized
One- to four-family residential construction	22	18	39
Subdivision construction	287	115	282
Land development	481	233	379
Commercial construction	35
Owner occupied one- to four-family residential	162	34	76
Non-owner occupied one- to four-family residential	454	201	425
Commercial real estate	1,524	461	1,616
Other residential	581	191	454
Commercial business	160	62	125
Consumer auto	12	4	6
Consumer other	62	7	10
Home equity lines of credit	6	1	1
Total impaired loans	$ 3,786	$ 1,327	$ 3,413