LOANS (Total Loans Outstanding) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	Jun. 30, 2016	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 3,280,547	$ 3,080,950
Percentage of Subtotal	100.00%	100.00%
Less: Allowance for loan losses	$ (42,853)	$ (43,610)	$ (43,247)	$ (44,694)	$ (44,816)	$ (46,262)
Net deferred loan fees	(386)	(21)
Loans, Net	$ 3,237,308	$ 3,037,319
Commercial Loans [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Total commercial loans	87.70%	87.70%
Other consumer loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 58,957	$ 49,113
Percentage of Total consumer loans	1.80%	1.60%
Consumer Loan [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 2,876,742	$ 2,700,734
Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: Allowance for loan losses	(20,320)	(21,564)	(20,935)	(22,313)	(22,360)	(22,785)
Commercial and Industrial Loans [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 1,250,981	$ 1,179,512
Percentage of Total commercial loans	38.10%	38.30%
Commercial and Industrial Loans [Member] | Working Capital Lines Of Credit Loans [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 609,382	$ 581,025
Percentage of Total commercial loans	18.60%	18.90%
Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 641,599	$ 598,487
Percentage of Total commercial loans	19.60%	19.40%
Commercial Real Estate and Multi-family Residential Loans [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 1,226,422	$ 1,130,053
Percentage of Total commercial loans	37.40%	36.70%
Commercial Real Estate and Multi-family Residential Loans [Member] | Construction and Land Development Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Total commercial loans		7.50%
Commercial Real Estate and Multi-family Residential Loans [Member] | Construction and Land Development Loans [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 221,436	$ 230,719
Percentage of Total commercial loans	6.70%
Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Total commercial loans		13.40%
Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 468,582	$ 412,026
Percentage of Total commercial loans	14.30%
Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Total commercial loans		13.20%
Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 408,620	$ 407,883
Percentage of Total commercial loans	12.50%
Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Total commercial loans		2.60%
Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 127,784	$ 79,425
Percentage of Total commercial loans	3.90%
Agri-business and Agricultural Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: Allowance for loan losses	$ (3,108)	(2,445)	$ (3,047)	$ (1,989)	$ (1,881)	$ (1,790)
Agri-business and Agricultural Loans [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 309,489	$ 306,094
Percentage of Total commercial loans	9.40%	9.90%
Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 152,719	$ 164,375
Percentage of Total commercial loans	4.70%	5.30%
Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 156,770	$ 141,719
Percentage of Total commercial loans	4.80%	4.60%
Other Commercial Loans [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 89,850	$ 85,075
Percentage of Total commercial loans	2.70%	2.80%
Total Consumer 1 To 4 Family Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 344,848	$ 331,103
Percentage of Total consumer loans	10.50%	10.70%
Total Consumer 1 To 4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 161,907	$ 158,062
Percentage of Total consumer loans	4.90%	5.10%
Total Consumer 1 To 4 Family Mortgage Loans [Member] | Open End And Junior Lien Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 170,140	$ 163,700
Percentage of Total consumer loans	5.20%	5.30%
Total Consumer 1 To 4 Family Mortgage Loans [Member] | Residential Construction and Land Development Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 12,801	$ 9,341
Percentage of Total consumer loans	0.40%	0.30%