Loans and Allowance For Loan Losses: Schedule of Impaired Loans (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Impaired one- to four-family residential construction
Impaired Loans Recorded Balance	$ 687	$ 873	$ 2,106
Impaired Loans Unpaid Principal Balance	687	917	2,197
Impaired Loans Specific Allowance	251	12	121
Impaired subdivision construction
Impaired Loans Recorded Balance	3,810	12,999	8,543
Impaired Loans Unpaid Principal Balance	5,486	14,730	9,467
Impaired Loans Specific Allowance	262	2,953	1,498
Impaired land development
Impaired Loans Recorded Balance	19,233	7,150	7,330
Impaired Loans Unpaid Principal Balance	20,710	7,317	7,995
Impaired Loans Specific Allowance	3,842	594	1,288
Impaired commercial construction
Impaired Loans Recorded Balance	1,530
Impaired Loans Unpaid Principal Balance	1,530
Impaired Loans Specific Allowance	134
Impaired owner occupied one- to four-family residential
Impaired Loans Recorded Balance	4,856	5,481	3,960
Impaired Loans Unpaid Principal Balance	5,309	6,105	4,529
Impaired Loans Specific Allowance	488	776	601
Impaired non-owner occupied one- to four-family residential
Impaired Loans Recorded Balance	10,965	11,259	9,126
Impaired Loans Unpaid Principal Balance	11,402	11,768	9,323
Impaired Loans Specific Allowance	1,028	1,249	1,074
Impaired commercial real estate
Impaired Loans Recorded Balance	39,634	49,961	22,038
Impaired Loans Unpaid Principal Balance	41,887	55,233	24,641
Impaired Loans Specific Allowance	1,045	3,562	1,795
Impaired Other residential
Impaired Loans Recorded Balance	17,335	12,102	8,330
Impaired Loans Unpaid Principal Balance	18,600	12,102	9,266
Impaired Loans Specific Allowance	246	89	369
Impaired commercial business
Impaired Loans Recorded Balance	3,447	4,679	2,366
Impaired Loans Unpaid Principal Balance	4,365	5,483	3,212
Impaired Loans Specific Allowance	517	736	502
Impaired industrial revenue bonds
Impaired Loans Recorded Balance	3,508	2,110	2,110
Impaired Loans Unpaid Principal Balance	3,588	2,190	2,190
Impaired Loans Specific Allowance	98	22	105
Impaired consumer auto
Impaired Loans Recorded Balance	158	147	121
Impaired Loans Unpaid Principal Balance	180	168	141
Impaired Loans Specific Allowance	25	3	6
Impaired consumer other
Impaired Loans Recorded Balance	669	579	550
Impaired Loans Unpaid Principal Balance	774	680	615
Impaired Loans Specific Allowance	99	22	63
Impaired home equity lines of credit
Impaired Loans Recorded Balance	90	174	120
Impaired Loans Unpaid Principal Balance	98	184	129
Impaired Loans Specific Allowance	23	12	17
Impaired total
Impaired Loans Recorded Balance	105,922	107,514	66,700
Impaired Loans Unpaid Principal Balance	114,616	116,877	73,705
Impaired Loans Specific Allowance	$ 8,058	$ 10,030	$ 7,439