Loans and Allowance For Loan Losses: Schedule of Loan Portfolio Credit Quality Internal Grading System (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Satisfactory
One- to four-family residential construction	$ 26,168	$ 21,436
Subdivision construction	34,114	45,754
Land development	48,263	41,179
Commercial construction	101,110	119,589
Owner occupied one- to four-family residential	85,660	86,725
Non-owner occupied one- to four-family residential	132,352	129,458
Commercial real estate	542,370	542,712
Other residential	257,514	222,940
Commercial business	220,576	225,664
Industrial revenue bonds	41,829	57,640
Consumer auto	65,656	59,237
Consumer other	80,580	77,006
Home equity lines of credit	49,115	46,940
FDIC-supported loans, net of discounts (TeamBank)	91,407	128,875
FDIC-supported loans, net of discounts (Vantus Bank)	107,485	123,036
FDIC-supported loans, net of discounts (Sun Security Bank)	110,478	144,626
FDIC-supported loans, net of discounts (InterBank)	276,976
Total Portfolio by Internal Grading System	2,271,653	2,072,817
Watch
One- to four-family residential construction	328	2,354
Subdivision construction	2,631	2,701
Land development	1,764	20,902
Owner occupied one- to four-family residential	619	1,018
Non-owner occupied one- to four-family residential	5,139	5,232
Commercial real estate	57,351	51,757
Other residential	16,454	13,262
Commercial business	8,627	5,403
Total Portfolio by Internal Grading System	92,913	102,629
Special Mention
Land development		245
Non-owner occupied one- to four-family residential		249
Commercial real estate		13,384
Commercial business		638
Total Portfolio by Internal Grading System		14,516
Substandard
One- to four-family residential construction	687	186
Subdivision construction	3,810	12,685
Land development	18,506	6,445
Commercial construction	1,530
Owner occupied one- to four-family residential	3,602	4,251
Non-owner occupied one- to four-family residential	10,533	10,842
Commercial real estate	20,302	32,004
Other residential	12,108	7,540
Commercial business	3,447	4,679
Industrial revenue bonds	3,508	2,110
Consumer auto	156	131
Consumer other	630	534
Home equity lines of credit	90	174
Total Portfolio by Internal Grading System	78,909	81,581
Total for Portfolio
One- to four-family residential construction	27,183	23,976
Subdivision construction	40,555	61,140
Land development	68,533	68,771
Commercial construction	102,640	119,589
Owner occupied one- to four-family residential	89,881	91,994
Non-owner occupied one- to four-family residential	148,024	145,781
Commercial real estate	620,023	639,857
Other residential	286,076	243,742
Commercial business	232,650	236,384
Industrial revenue bonds	45,337	59,750
Consumer auto	65,812	59,368
Consumer other	81,210	77,540
Home equity lines of credit	49,205	47,114
FDIC-supported loans, net of discounts (TeamBank)	91,407	128,875
FDIC-supported loans, net of discounts (Vantus Bank)	107,485	123,036
FDIC-supported loans, net of discounts (Sun Security Bank)	110,478	144,626
FDIC-supported loans, net of discounts (InterBank)	276,976
Total Portfolio by Internal Grading System	$ 2,443,475	$ 2,271,543