FAIR VALUE (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2010
Assets:
Servicing rights	$ 3,135		$ 3,135		$ 4,000
Other real estate owned/assets held for sale	9,737	14,324	9,737	14,324	15,456	11,453
Gross carrying amount of impaired loans	14,910		14,910		11,399
Valuation allowance of impaired loans	5,858		5,858		3,657
Provision expenses of impaired loans	456	1,412	980	3,839
Valuation allowance of servicing rights			675		449
Servicing rights charge included in earnings	226		226
Gross outstanding balance of servicing rights					4,449
Gross outstanding balance of other real estate owned/assets held for sale	4,974		4,974		9,519
Valuation allowance of other real estate owned/assets held for sale	2,154	1,716	2,154	1,716	4,003
Write-down of other real estate owned/assets held for sale	0	228	43	737
Breakdown of properties by portfolio class
Gross outstanding balance of other real estate owned/assets held for sale	4,974		4,974		9,519
Valuation allowance of other real estate owned/assets held for sale	2,154	1,716	2,154	1,716	4,003
Other real estate owned/assets held for sale	9,737	14,324	9,737	14,324	15,456	11,453
Rate used for estimating selling costs on all impaired loans (as a percent)			13.00%
Loans examined	14,910		14,910		11,399
Minimum
Assets:
Gross carrying amount of impaired loans	250		250
Breakdown of properties by portfolio class
Loans examined	250		250
Commercial and industrial
Assets:
Gross carrying amount of impaired loans	292		292
Valuation allowance of impaired loans	79		79
Breakdown of properties by portfolio class
Loans examined	292		292
Number of commercial and industrial loans	1		1
Farm
Assets:
Gross carrying amount of impaired loans	461		461
Valuation allowance of impaired loans	124		124
Breakdown of properties by portfolio class
Loans examined	461		461
Construction and development
Assets:
Other real estate owned/assets held for sale	1,891		1,891
Gross carrying amount of impaired loans	1,206		1,206
Valuation allowance of impaired loans	606		606
Gross outstanding balance of other real estate owned/assets held for sale	3,874		3,874
Valuation allowance of other real estate owned/assets held for sale	1,983		1,983
Breakdown of properties by portfolio class
Gross outstanding balance of other real estate owned/assets held for sale	3,874		3,874
Valuation allowance of other real estate owned/assets held for sale	1,983		1,983
Other real estate owned/assets held for sale	1,891		1,891
Loans examined	1,206		1,206
Other commercial real estate
Assets:
Other real estate owned/assets held for sale	929		929
Gross carrying amount of impaired loans	12,951		12,951
Valuation allowance of impaired loans	5,049		5,049
Gross outstanding balance of other real estate owned/assets held for sale	1,100		1,100
Valuation allowance of other real estate owned/assets held for sale	171		171
Breakdown of properties by portfolio class
Gross outstanding balance of other real estate owned/assets held for sale	1,100		1,100
Valuation allowance of other real estate owned/assets held for sale	171		171
Other real estate owned/assets held for sale	929		929
Loans examined	12,951		12,951
Non-recurring basis
Assets:
Total impaired loans	9,052		9,052		7,742
Servicing rights	3,135		3,135		4,000
Other real estate owned/assets held for sale	2,820		2,820		5,516
Breakdown of properties by portfolio class
Other real estate owned/assets held for sale	2,820		2,820		5,516
Non-recurring basis | Commercial and industrial
Assets:
Total impaired loans	213		213		519
Non-recurring basis | Agricultural
Assets:
Total impaired loans					43
Non-recurring basis | Farm
Assets:
Total impaired loans	337		337		292
Non-recurring basis | Construction and development
Assets:
Total impaired loans	600		600		763
Other real estate owned/assets held for sale	1,891		1,891		1,880
Breakdown of properties by portfolio class
Other real estate owned/assets held for sale	1,891		1,891		1,880
Non-recurring basis | Other
Assets:
Total impaired loans	7,902		7,902		6,125
Non-recurring basis | Other commercial real estate
Assets:
Other real estate owned/assets held for sale	929		929		3,636
Breakdown of properties by portfolio class
Other real estate owned/assets held for sale	929		929		3,636
Non-recurring basis | Significant Other Observable Inputs (Level 2)
Assets:
Servicing rights	3,135		3,135		4,000
Non-recurring basis | Significant Unobservable Inputs (Level 3)
Assets:
Total impaired loans	9,052		9,052		7,742
Other real estate owned/assets held for sale	2,820		2,820		5,516
Breakdown of properties by portfolio class
Other real estate owned/assets held for sale	2,820		2,820		5,516
Non-recurring basis | Significant Unobservable Inputs (Level 3) | Commercial and industrial
Assets:
Total impaired loans	213		213		519
Non-recurring basis | Significant Unobservable Inputs (Level 3) | Agricultural
Assets:
Total impaired loans					43
Non-recurring basis | Significant Unobservable Inputs (Level 3) | Farm
Assets:
Total impaired loans	337		337		292
Non-recurring basis | Significant Unobservable Inputs (Level 3) | Construction and development
Assets:
Total impaired loans	600		600		763
Other real estate owned/assets held for sale	1,891		1,891		1,880
Breakdown of properties by portfolio class
Other real estate owned/assets held for sale	1,891		1,891		1,880
Non-recurring basis | Significant Unobservable Inputs (Level 3) | Other
Assets:
Total impaired loans	7,902		7,902		6,125
Non-recurring basis | Significant Unobservable Inputs (Level 3) | Other commercial real estate
Assets:
Other real estate owned/assets held for sale	929		929		3,636
Breakdown of properties by portfolio class
Other real estate owned/assets held for sale	$ 929		$ 929		$ 3,636