FAIR VALUE DISCLOSURES, Fair value hierarchy (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2010
Assets [Abstract]
Residential mortgage-backed securities	$ 392,280,000		$ 392,280,000
Total Securities	481,256,000	73,300,000	481,256,000	73,300,000
Assets measured at fair value on nonrecurring basis [Abstract]
Mortgage servicing rights	2,000,000		2,000,000
Impaired loan gross carrying value	2,203,798		2,203,798		2,234,037
Valuation allowance	51,912,000	52,073,000	51,912,000	52,073,000	53,400,000	51,817,000	51,260,000	45,007,000
Net recovery in provision for loan losses	578,000	512,000	1,280,000	1,214,000	1,422,000
Mortgage servicing rights outstanding balance	2,200,000		2,200,000
Valuation allowance for servicing rights			192,000
Mortgage servicing right recovery			84,000	162,000
Reduction in other real estate			76,000	72,000
Construction and Land Development Loans [Member]
Assets [Abstract]
Total Securities	28,069,000		28,069,000
Mortgage Servicing Rights [Member]
Assets [Abstract]
Total Securities	1,969,000		1,969,000
Other Real Estate Owned [Member]
Assets [Abstract]
Total Securities	81,000		81,000
Commercial and Industrial Loans [Member]
Assets [Abstract]
Total Securities	6,641,000		6,641,000
Assets measured at fair value on nonrecurring basis [Abstract]
Valuation allowance	21,354,000	23,752,000	21,354,000	23,752,000	22,830,000	19,696,000	22,999,000	21,479,000
Net recovery in provision for loan losses	224,000	465,000	696,000	695,000	826,000
Commercial Real Estate and Multi-family Residential Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Valuation allowance	22,855,000	21,619,000	22,855,000	21,619,000	23,489,000	24,083,000	20,032,000	15,893,000
Net recovery in provision for loan losses	120,000	10,000	167,000	327,000	362,000
Agri-business and Agricultural Loans [Member]
Assets [Abstract]
Total Securities	266,000		266,000
Assets measured at fair value on nonrecurring basis [Abstract]
Valuation allowance	1,344,000	651,000	1,344,000	651,000	695,000	1,419,000	948,000	1,318,000
Net recovery in provision for loan losses	1,000	0	0	0	0
Consumer 1-4 Family Mortgage Loans [Member]
Assets [Abstract]
Total Securities	655,000		655,000
Assets measured at fair value on nonrecurring basis [Abstract]
Valuation allowance	2,593,000	2,099,000	2,593,000	2,099,000	2,322,000	2,412,000	2,658,000	1,694,000
Net recovery in provision for loan losses	21,000	5,000	121,000	24,000	46,000
Other Consumer Loans [Member]
Assets [Abstract]
Total Securities	27,000		27,000
Level 1 [Member] | Recurring [Member]
Assets [Abstract]
U.S. Treasury securities	1,042,000		1,042,000		1,055,000
U.S. Government sponsored agencies	0		0		0
Residential mortgage-backed securities	0		0		0
Non-agency residential mortgage-backed securities	0		0		0
State and municipal securities	0		0		0
Total Securities	1,042,000		1,042,000		1,055,000
Mortgage banking derivative	0		0		0
Total assets	1,042,000		1,042,000		1,055,000
Liabilities
Mortgage banking derivative	0		0		0
Assets measured at fair value on nonrecurring basis [Abstract]
Total assets	1,042,000		1,042,000		1,055,000
Level 1 [Member] | Non-Recurring [Member]
Assets [Abstract]
Total assets	0		0		0
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Mortgage servicing rights	0		0		0
Other real estate owned	0		0		0
Total assets	0		0		0
Level 1 [Member] | Non-Recurring [Member] | Commercial and Industrial Loans [Member] | Working Capital Lines of Credit Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 1 [Member] | Non-Recurring [Member] | Commercial and Industrial Loans [Member] | Non Working Capital Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 1 [Member] | Non-Recurring [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Construction and Land Development Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 1 [Member] | Non-Recurring [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 1 [Member] | Non-Recurring [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 1 [Member] | Non-Recurring [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 1 [Member] | Non-Recurring [Member] | Agri-business and Agricultural Loans [Member] | Loans Secured by Farmland [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 1 [Member] | Non-Recurring [Member] | Agri-business and Agricultural Loans [Member] | Loans for Agricultural Production [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 1 [Member] | Non-Recurring [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 1 [Member] | Non-Recurring [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Open End and Junior Lien Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 1 [Member] | Non-Recurring [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Residential Construction Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 1 [Member] | Non-Recurring [Member] | Other Consumer Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 2 [Member] | Recurring [Member]
Assets [Abstract]
U.S. Treasury securities	0		0		0
U.S. Government sponsored agencies	5,316,000		5,316,000		5,277,000
Residential mortgage-backed securities	385,298,000		385,298,000		350,102,000
Non-agency residential mortgage-backed securities	6,982,000		6,982,000		32,207,000
State and municipal securities	81,981,000		81,981,000		78,064,000
Total Securities	479,577,000		479,577,000		465,650,000
Mortgage banking derivative	917,000		917,000		406,000
Total assets	480,494,000		480,494,000		466,056,000
Liabilities
Mortgage banking derivative	(319,000)		(319,000)		(81,000)
Assets measured at fair value on nonrecurring basis [Abstract]
Total assets	480,494,000		480,494,000		466,056,000
Level 2 [Member] | Non-Recurring [Member]
Assets [Abstract]
Total assets	0		0		0
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Mortgage servicing rights	0		0		0
Other real estate owned	0		0		0
Total assets	0		0		0
Level 2 [Member] | Non-Recurring [Member] | Commercial and Industrial Loans [Member] | Working Capital Lines of Credit Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 2 [Member] | Non-Recurring [Member] | Commercial and Industrial Loans [Member] | Non Working Capital Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 2 [Member] | Non-Recurring [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Construction and Land Development Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 2 [Member] | Non-Recurring [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 2 [Member] | Non-Recurring [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 2 [Member] | Non-Recurring [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 2 [Member] | Non-Recurring [Member] | Agri-business and Agricultural Loans [Member] | Loans Secured by Farmland [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 2 [Member] | Non-Recurring [Member] | Agri-business and Agricultural Loans [Member] | Loans for Agricultural Production [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 2 [Member] | Non-Recurring [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 2 [Member] | Non-Recurring [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Open End and Junior Lien Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 2 [Member] | Non-Recurring [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Residential Construction Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 2 [Member] | Non-Recurring [Member] | Other Consumer Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 3 [Member] | Recurring [Member]
Assets [Abstract]
U.S. Treasury securities	0		0		0
U.S. Government sponsored agencies	0		0		0
Residential mortgage-backed securities	0		0		0
Non-agency residential mortgage-backed securities	0		0		0
State and municipal securities	637,000		637,000		686,000
Total Securities	637,000		637,000		686,000
Mortgage banking derivative	0		0		0
Total assets	637,000		637,000		686,000
Liabilities
Mortgage banking derivative	0		0		0
Assets measured at fair value on nonrecurring basis [Abstract]
Total assets	637,000		637,000		686,000
Level 3 [Member] | Non-Recurring [Member]
Assets [Abstract]
Total assets	37,747,000		37,747,000		46,444,000
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	35,697,000		35,697,000		43,980,000
Mortgage servicing rights	1,969,000		1,969,000		1,734,000
Other real estate owned	81,000		81,000		730,000
Total assets	37,747,000		37,747,000		46,444,000
Level 3 [Member] | Non-Recurring [Member] | Commercial and Industrial Loans [Member] | Working Capital Lines of Credit Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	1,657,000		1,657,000		2,762,000
Level 3 [Member] | Non-Recurring [Member] | Commercial and Industrial Loans [Member] | Non Working Capital Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	5,275,000		5,275,000		11,885,000
Level 3 [Member] | Non-Recurring [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Construction and Land Development Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	2,724,000		2,724,000		303,000
Level 3 [Member] | Non-Recurring [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	4,760,000		4,760,000		3,515,000
Level 3 [Member] | Non-Recurring [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	20,585,000		20,585,000		23,591,000
Level 3 [Member] | Non-Recurring [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 3 [Member] | Non-Recurring [Member] | Agri-business and Agricultural Loans [Member] | Loans Secured by Farmland [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	266,000		266,000		433,000
Level 3 [Member] | Non-Recurring [Member] | Agri-business and Agricultural Loans [Member] | Loans for Agricultural Production [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		207,000
Level 3 [Member] | Non-Recurring [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	241,000		241,000		878,000
Level 3 [Member] | Non-Recurring [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Open End and Junior Lien Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	162,000		162,000		406,000
Level 3 [Member] | Non-Recurring [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Residential Construction Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Level 3 [Member] | Non-Recurring [Member] | Other Consumer Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	1,000		1,000		0
Fair Value [Member] | Recurring [Member]
Assets [Abstract]
U.S. Treasury securities	1,042,000		1,042,000		1,055,000
U.S. Government sponsored agencies	5,316,000		5,316,000		5,277,000
Residential mortgage-backed securities	385,298,000		385,298,000		350,102,000
Non-agency residential mortgage-backed securities	6,982,000		6,982,000		32,207,000
State and municipal securities	82,618,000		82,618,000		78,750,000
Total Securities	481,256,000		481,256,000		467,391,000
Mortgage banking derivative	917,000		917,000		406,000
Total assets	482,173,000		482,173,000		467,797,000
Liabilities
Mortgage banking derivative	(319,000)		(319,000)		(81,000)
Assets measured at fair value on nonrecurring basis [Abstract]
Total assets	482,173,000		482,173,000		467,797,000
Fair Value [Member] | Non-Recurring [Member]
Assets [Abstract]
Total assets	37,747,000		37,747,000		46,444,000
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	35,697,000		35,697,000		43,980,000
Mortgage servicing rights	1,969,000		1,969,000		1,734,000
Other real estate owned	81,000		81,000		730,000
Total assets	37,747,000		37,747,000		46,444,000
Fair Value [Member] | Non-Recurring [Member] | Commercial and Industrial Loans [Member] | Working Capital Lines of Credit Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	1,657,000		1,657,000		2,762,000
Fair Value [Member] | Non-Recurring [Member] | Commercial and Industrial Loans [Member] | Non Working Capital Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	5,275,000		5,275,000		11,885,000
Fair Value [Member] | Non-Recurring [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Construction and Land Development Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	2,724,000		2,724,000		303,000
Fair Value [Member] | Non-Recurring [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	4,760,000		4,760,000		3,515,000
Fair Value [Member] | Non-Recurring [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	20,585,000		20,585,000		23,591,000
Fair Value [Member] | Non-Recurring [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Fair Value [Member] | Non-Recurring [Member] | Agri-business and Agricultural Loans [Member] | Loans Secured by Farmland [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	266,000		266,000		433,000
Fair Value [Member] | Non-Recurring [Member] | Agri-business and Agricultural Loans [Member] | Loans for Agricultural Production [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		207,000
Fair Value [Member] | Non-Recurring [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	241,000		241,000		878,000
Fair Value [Member] | Non-Recurring [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Open End and Junior Lien Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	162,000		162,000		406,000
Fair Value [Member] | Non-Recurring [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Residential Construction Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	0		0		0
Fair Value [Member] | Non-Recurring [Member] | Other Consumer Loans [Member]
Assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans	$ 27,000		$ 27,000		$ 0