FAIR VALUE (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Dec. 31, 2010
Assets:
Servicing rights	$ 3,630	$ 5,240	$ 3,630	$ 5,240	$ 4,000
Other real estate owned/assets held for sale	9,677	18,269	9,677	18,269	15,456	11,453
Gross carrying amount of impaired loans	16,002		16,002		11,399
Valuation allowance of impaired loans	5,940		5,940		3,657
Provision expenses of impaired loans	1,279	1,177	1,320	5,447
Valuation allowance of servicing rights	900	724	900	724	449
Servicing rights charge included in earnings	225	230	451	230
Gross outstanding balance of servicing rights					4,449
Gross outstanding balance of other real estate owned/assets held for sale	6,469		6,469		9,519
Valuation allowance of other real estate owned/assets held for sale	2,537	2,668	2,537	2,668	4,003	1,332
Write-down of other real estate owned/assets held for sale	339	980	340	1,717
Breakdown of properties by portfolio class
Gross outstanding balance of other real estate owned/assets held for sale	6,469		6,469		9,519
Valuation allowance of other real estate owned/assets held for sale	2,537	2,668	2,537	2,668	4,003	1,332
Other real estate owned/assets held for sale	9,677	18,269	9,677	18,269	15,456	11,453
Loans examined	16,002		16,002		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	3,011		3,011
Valuation allowance of impaired loans	1,817		1,817
Breakdown of properties by portfolio class
Loans examined	3,011		3,011
Number of commercial and industrial loans	1		1
Farm
Assets:
Gross carrying amount of impaired loans	461		461
Valuation allowance of impaired loans	146		146
Breakdown of properties by portfolio class
Loans examined	461		461
Construction and development
Assets:
Other real estate owned/assets held for sale	2,897		2,897
Gross carrying amount of impaired loans	1,764		1,764
Valuation allowance of impaired loans	668		668
Gross outstanding balance of other real estate owned/assets held for sale	5,156		5,156
Valuation allowance of other real estate owned/assets held for sale	2,259		2,259
Breakdown of properties by portfolio class
Gross outstanding balance of other real estate owned/assets held for sale	5,156		5,156
Valuation allowance of other real estate owned/assets held for sale	2,259		2,259
Other real estate owned/assets held for sale	2,897		2,897
Loans examined	1,764		1,764
Other commercial real estate
Assets:
Other real estate owned/assets held for sale	953		953
Gross carrying amount of impaired loans	10,766		10,766
Valuation allowance of impaired loans	3,309		3,309
Gross outstanding balance of other real estate owned/assets held for sale	1,113		1,113
Valuation allowance of other real estate owned/assets held for sale	160		160
Breakdown of properties by portfolio class
Gross outstanding balance of other real estate owned/assets held for sale	1,113		1,113
Valuation allowance of other real estate owned/assets held for sale	160		160
Other real estate owned/assets held for sale	953		953
Loans examined	10,766		10,766
1-4 family
Assets:
Other real estate owned/assets held for sale	172		172
Gross outstanding balance of other real estate owned/assets held for sale	200		200
Valuation allowance of other real estate owned/assets held for sale	28		28
Breakdown of properties by portfolio class
Gross outstanding balance of other real estate owned/assets held for sale	200		200
Valuation allowance of other real estate owned/assets held for sale	28		28
Other real estate owned/assets held for sale	172		172
Non-recurring basis
Assets:
Total impaired loans	10,062		10,062		7,742
Servicing rights	3,630		3,630		4,000
Other real estate owned/assets held for sale	4,022		4,022		5,516
Breakdown of properties by portfolio class
Other real estate owned/assets held for sale	4,022		4,022		5,516
Non-recurring basis | Commercial and industrial
Assets:
Total impaired loans	1,194		1,194		519
Non-recurring basis | Agricultural
Assets:
Total impaired loans					43
Non-recurring basis | Farm
Assets:
Total impaired loans	315		315		292
Non-recurring basis | Construction and development
Assets:
Total impaired loans	1,096		1,096		763
Other real estate owned/assets held for sale	2,897		2,897		1,880
Breakdown of properties by portfolio class
Other real estate owned/assets held for sale	2,897		2,897		1,880
Non-recurring basis | Other
Assets:
Total impaired loans	7,457		7,457		6,125
Non-recurring basis | Other commercial real estate
Assets:
Other real estate owned/assets held for sale	953		953		3,636
Breakdown of properties by portfolio class
Other real estate owned/assets held for sale	953		953		3,636
Non-recurring basis | 1-4 family
Assets:
Other real estate owned/assets held for sale	172		172
Breakdown of properties by portfolio class
Other real estate owned/assets held for sale	172		172
Non-recurring basis | Significant Unobservable Inputs (Level 3)
Assets:
Total impaired loans	10,062		10,062		7,742
Servicing rights	3,630		3,630		4,000
Other real estate owned/assets held for sale	4,022		4,022		5,516
Breakdown of properties by portfolio class
Other real estate owned/assets held for sale	4,022		4,022		5,516
Non-recurring basis | Significant Unobservable Inputs (Level 3) | Commercial and industrial
Assets:
Total impaired loans	1,194		1,194		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	315		315		292
Non-recurring basis | Significant Unobservable Inputs (Level 3) | Construction and development
Assets:
Total impaired loans	1,096		1,096		763
Other real estate owned/assets held for sale	2,897		2,897		1,880
Breakdown of properties by portfolio class
Other real estate owned/assets held for sale	2,897		2,897		1,880
Non-recurring basis | Significant Unobservable Inputs (Level 3) | Other
Assets:
Total impaired loans	7,457		7,457		6,125
Non-recurring basis | Significant Unobservable Inputs (Level 3) | Other commercial real estate
Assets:
Other real estate owned/assets held for sale	953		953		3,636
Breakdown of properties by portfolio class
Other real estate owned/assets held for sale	953		953		3,636
Non-recurring basis | Significant Unobservable Inputs (Level 3) | 1-4 family
Assets:
Other real estate owned/assets held for sale	172		172
Breakdown of properties by portfolio class
Other real estate owned/assets held for sale	$ 172		$ 172