LOANS (Total Loans Outstanding) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Jun. 30, 2013	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans	$ 320,310	$ 328,485
Subtotal	2,393,360	2,257,844
Less: Allowance for loan losses	(49,804)	(51,445)	(50,635)	(51,912)	(51,817)	(53,400)
Net deferred loan fees	(645)	(324)
Loans, net	2,342,911	2,206,075
Percentage of Total consumer loans	13.40%	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	898,066	846,822
Less: Allowance for loan losses	(21,497)	(22,342)	(21,879)	(21,354)	(19,696)	(22,830)
Percentage of Total commercial loans	37.50%	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	462,098	439,638
Percentage of Total commercial loans	19.30%	19.50%
Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	435,968	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	919,050	801,011
Percentage of Total commercial loans	38.40%	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	117,733	82,494
Percentage of Total commercial loans	4.90%	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	371,500	358,617
Percentage of Total commercial loans	15.50%	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	392,538	314,889
Percentage of Total commercial loans	16.40%	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	37,279	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	200,137	224,719
Less: Allowance for loan losses	(1,533)	(1,403)	(1,517)	(1,344)	(1,419)	(695)
Percentage of Total commercial loans	8.40%	10.00%
Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	104,807	109,147
Percentage of Total commercial loans	4.40%	4.80%
Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	95,330	115,572
Percentage of Total commercial loans	4.00%	5.10%
Other Commerical Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	2,073,050	1,929,359
Percentage of Total commercial loans	86.60%	85.50%
Consumer 1-4 Family Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans	276,219	282,730
Percentage of Total consumer loans	11.50%	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	119,788	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	151,726	161,366
Percentage of Total consumer loans	6.30%	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	4,705	11,541
Percentage of Total consumer loans	0.20%	0.50%
Other Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	55,797	56,807
Total consumer loans	$ 44,091	$ 45,755
Percentage of Total commercial loans	2.30%	2.50%
Percentage of Total consumer loans	1.80%	2.00%