ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	$ 3,622,961	$ 3,462,648
30 to 89 Days Past Due	1,939	1,593
Nonaccrual	10,279	6,633
Total Past Due And Nonaccrual	12,291	8,279
Total	3,635,252	3,470,927
Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due And Nonaccrual	73	53
Other Commercial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	114,705	98,265
30 to 89 Days Past Due	0	0
Nonaccrual	0	0
Total Past Due And Nonaccrual	0	0
Total	114,705	98,265
Other Commercial Loans [Member] | Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due And Nonaccrual	0	0
Other consumer loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	67,314	61,119
30 to 89 Days Past Due	45	64
Nonaccrual	0	0
Total Past Due And Nonaccrual	45	64
Total	67,359	61,183
Other consumer loans [Member] | Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due And Nonaccrual	0	0
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total	1,362,045	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	701,635	624,213
30 to 89 Days Past Due	475	9
Nonaccrual	1,883	140
Total Past Due And Nonaccrual	2,358	149
Total	703,993	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 And Nonaccrual	0	0
Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	653,885	642,014
30 to 89 Days Past Due	310	0
Nonaccrual	3,857	2,082
Total Past Due And Nonaccrual	4,167	2,082
Total	658,052	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 And Nonaccrual	0	0
Commercial Real Estate and Multi-Family Residential Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total	1,408,262	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	286,895	244,411
30 to 89 Days Past Due	0	0
Nonaccrual	0	0
Total Past Due And Nonaccrual	0	0
Total	286,895	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 And Nonaccrual	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	495,576	465,789
30 to 89 Days Past Due	0	0
Nonaccrual	3,753	3,598
Total Past Due And Nonaccrual	3,753	3,598
Total	499,329	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 And Nonaccrual	0	0
Commercial Real Estate and Multi-Family Residential Loans [Member] | Nonowner Occupied Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	456,451	457,880
30 to 89 Days Past Due	0	0
Nonaccrual	98	122
Total Past Due And Nonaccrual	98	122
Total	456,549	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 And Nonaccrual	0	0
Commercial Real Estate and Multi-Family Residential Loans [Member] | Multifamily Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	165,489	127,482
30 to 89 Days Past Due	0	0
Nonaccrual	0	0
Total Past Due And Nonaccrual	0	0
Total	165,489	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 And Nonaccrual	0	0
Agri-business and Agricultural Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total	317,957	394,904
Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	161,248	172,349
30 to 89 Days Past Due	0	0
Nonaccrual	311	283
Total Past Due And Nonaccrual	311	283
Total	161,559	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 And Nonaccrual	0	0
Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	156,398	222,272
30 to 89 Days Past Due	0	0
Nonaccrual	0	0
Total Past Due And Nonaccrual	0	0
Total	156,398	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 And Nonaccrual	0	0
Consumer 1-4 Family Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total	364,924	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	170,467	161,499
30 to 89 Days Past Due	920	1,072
Nonaccrual	134	213
Total Past Due And Nonaccrual	1,127	1,338
Total	171,594	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 And Nonaccrual	73	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	182,394	170,372
30 to 89 Days Past Due	189	448
Nonaccrual	243	195
Total Past Due And Nonaccrual	432	643
Total	182,826	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 And Nonaccrual	0	0
Consumer 1-4 Family Mortgage Loans [Member] | Residential Construction Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	10,504	14,983
30 to 89 Days Past Due	0	0
Nonaccrual	0	0
Total Past Due And Nonaccrual	0	0
Total	10,504	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 And Nonaccrual	$ 0	$ 0