ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	$ 3,518,968	$ 3,462,648
30 to 89 Days Past Due	1,493	1,593
Nonaccrual	10,185	6,633
Total Past Due	13,311	8,279
Total	3,532,279	3,470,927
Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	1,633	53
Other Commercial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	105,681	98,265
30 to 89 Days Past Due	0	0
Nonaccrual	0	0
Total Past Due	0	0
Total	105,681	98,265
Other Commercial Loans [Member] | Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	0	0
Other consumer loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	60,626	61,119
30 to 89 Days Past Due	53	64
Nonaccrual	0	0
Total Past Due	53	64
Total	60,679	61,183
Other consumer loans [Member] | Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	0	0
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total	1,323,954	1,268,458
Commercial and Industrial Loans [Member] | Working Capital Lines Of Credit Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	649,021	624,213
30 to 89 Days Past Due	60	9
Nonaccrual	1,598	140
Total Past Due	1,658	149
Total	650,679	624,362
Commercial and Industrial Loans [Member] | Working Capital Lines Of Credit Loans [Member] | Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	0	0
Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	669,325	642,014
30 to 89 Days Past Due	9	0
Nonaccrual	3,941	2,082
Total Past Due	3,950	2,082
Total	673,275	644,096
Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member] | Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	0	0
Commercial Real Estate and Multi-Family Residential Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total	1,369,364	1,299,282
Commercial Real Estate and Multi-Family Residential Loans [Member] | Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	237,365	244,411
30 to 89 Days Past Due	0	0
Nonaccrual	0	0
Total Past Due	0	0
Total	237,365	244,411
Commercial Real Estate and Multi-Family Residential Loans [Member] | Construction and Land Development Loans [Member] | Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	0	0
Commercial Real Estate and Multi-Family Residential Loans [Member] | Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	462,792	465,789
30 to 89 Days Past Due	0	0
Nonaccrual	3,888	3,598
Total Past Due	5,521	3,598
Total	468,313	469,387
Commercial Real Estate and Multi-Family Residential Loans [Member] | Owner Occupied Loans [Member] | Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	1,633	0
Commercial Real Estate and Multi-Family Residential Loans [Member] | Nonowner Occupied Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	462,282	457,880
30 to 89 Days Past Due	399	0
Nonaccrual	114	122
Total Past Due	513	122
Total	462,795	458,002
Commercial Real Estate and Multi-Family Residential Loans [Member] | Nonowner Occupied Loans [Member] | Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	0	0
Commercial Real Estate and Multi-Family Residential Loans [Member] | Multifamily Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	200,891	127,482
30 to 89 Days Past Due	0	0
Nonaccrual	0	0
Total Past Due	0	0
Total	200,891	127,482
Commercial Real Estate and Multi-Family Residential Loans [Member] | Multifamily Loans [Member] | Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	0	0
Agri-business and Agricultural Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total	327,646	394,904
Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	137,790	172,349
30 to 89 Days Past Due	0	0
Nonaccrual	283	283
Total Past Due	283	283
Total	138,073	172,632
Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland [Member] | Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	0	0
Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	189,573	222,272
30 to 89 Days Past Due	0	0
Nonaccrual	0	0
Total Past Due	0	0
Total	189,573	222,272
Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production [Member] | Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	0	0
Consumer 1-4 Family Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total	344,955	348,835
Consumer 1-4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	164,891	161,499
30 to 89 Days Past Due	740	1,072
Nonaccrual	205	213
Total Past Due	945	1,338
Total	165,836	162,837
Consumer 1-4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member] | Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	0	53
Consumer 1-4 Family Mortgage Loans [Member] | Open End and Junior Lien Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	168,488	170,372
30 to 89 Days Past Due	232	448
Nonaccrual	156	195
Total Past Due	388	643
Total	168,876	171,015
Consumer 1-4 Family Mortgage Loans [Member] | Open End and Junior Lien Loans [Member] | Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	0	0
Consumer 1-4 Family Mortgage Loans [Member] | Residential Construction Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	10,243	14,983
30 to 89 Days Past Due	0	0
Nonaccrual	0	0
Total Past Due	0	0
Total	10,243	14,983
Consumer 1-4 Family Mortgage Loans [Member] | Residential Construction Loans [Member] | Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	$ 0	$ 0