LOANS (Total Loans Outstanding) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Mar. 31, 2013	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	$ 2,017,780	$ 1,929,359
Total consumer loans	317,551	328,485
Subtotal	2,335,331	2,257,844
Less: Allowance for loan losses	(50,635)	(51,445)	(50,818)	(51,817)	(52,757)	(53,400)
Net deferred loan fees	(631)	(324)
Loans, net	2,284,065	2,206,075
Percentage of Total commercial loans	86.40%	85.50%
Percentage of Total consumer loans	13.60%	14.50%
Percentage of Subtotal	100.00%	100.00%
Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	888,095	846,822
Less: Allowance for loan losses	(21,879)	(22,342)	(22,113)	(19,696)	(22,134)	(22,830)
Percentage of Total commercial loans	38.00%	37.50%
Commercial and Industrial Loans [Member] | Working Capital Lines Of Credit Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	462,137	439,638
Percentage of Total commercial loans	19.80%	19.50%
Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	425,958	407,184
Percentage of Total commercial loans	18.20%	18.00%
Commercial Real Estate and Multi-family Residential Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	884,884	801,011
Percentage of Total commercial loans	37.90%	35.50%
Commercial Real Estate and Multi-family Residential Loans [Member] | Construction and Land Development Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	108,695	82,494
Percentage of Total commercial loans	4.70%	3.70%
Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	365,071	358,617
Percentage of Total commercial loans	15.60%	15.90%
Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	373,696	314,889
Percentage of Total commercial loans	16.00%	13.90%
Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	37,422	45,011
Percentage of Total commercial loans	1.60%	2.00%
Agri-business and Agricultural Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	198,300	224,719
Less: Allowance for loan losses	(1,517)	(1,403)	(1,263)	(1,419)	(538)	(695)
Percentage of Total commercial loans	8.50%	10.00%
Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	100,571	109,147
Percentage of Total commercial loans	4.30%	4.80%
Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	97,729	115,572
Percentage of Total commercial loans	4.20%	5.10%
Other Commerical Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	46,501	56,807
Percentage of Total commercial loans	2.00%	2.50%
Consumer 1-4 Family Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans	274,081	282,730
Percentage of Total consumer loans	11.70%	12.50%
Consumer 1-4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans	116,247	109,823
Percentage of Total consumer loans	5.00%	4.90%
Consumer 1-4 Family Mortgage Loans [Member] | Open End And Junior Lien Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans	152,571	161,366
Percentage of Total consumer loans	6.50%	7.10%
Consumer 1-4 Family Mortgage Loans [Member] | Residential Construction and Land Development Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans	5,263	11,541
Percentage of Total consumer loans	0.20%	0.50%
Other Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans	$ 43,470	$ 45,755
Percentage of Total consumer loans	1.90%	2.00%