ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	$ 3,799,432	$ 3,462,648
30 to 89 Days Past Due	9,619	1,593
Nonaccrual	9,402	6,633
Total Past Due and Nonaccural	19,027	8,279
Total	3,818,459	3,470,927
Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	6	53
Other Commercial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	123,922	98,265
30 to 89 Days Past Due	0	0
Nonaccrual	0	0
Total Past Due and Nonaccural	0	0
Total	123,922	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	74,102	61,119
30 to 89 Days Past Due	92	64
Nonaccrual	0	0
Total Past Due and Nonaccural	92	64
Total	74,194	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	1,418,627	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	742,205	624,213
30 to 89 Days Past Due	11	9
Nonaccrual	1,459	140
Total Past Due and Nonaccural	1,470	149
Total	743,675	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	671,490	642,014
30 to 89 Days Past Due	0	0
Nonaccrual	3,462	2,082
Total Past Due and Nonaccural	3,462	2,082
Total	674,952	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	1,443,021	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	215,713	244,411
30 to 89 Days Past Due	8,000	0
Nonaccrual	0	0
Total Past Due and Nonaccural	8,000	0
Total	223,713	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	534,648	465,789
30 to 89 Days Past Due	0	0
Nonaccrual	3,620	3,598
Total Past Due and Nonaccural	3,620	3,598
Total	538,268	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	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	507,696	457,880
30 to 89 Days Past Due	0	0
Nonaccrual	0	122
Total Past Due and Nonaccural	0	122
Total	507,696	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	173,100	127,482
30 to 89 Days Past Due	244	0
Nonaccrual	0	0
Total Past Due and Nonaccural	244	0
Total	173,344	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	382,926	394,904
Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	186,160	172,349
30 to 89 Days Past Due	0	0
Nonaccrual	283	283
Total Past Due and Nonaccural	283	283
Total	186,443	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	196,483	222,272
30 to 89 Days Past Due	0	0
Nonaccrual	0	0
Total Past Due and Nonaccural	0	0
Total	196,483	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	375,769	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	177,410	161,499
30 to 89 Days Past Due	1,183	1,072
Nonaccrual	342	213
Total Past Due and Nonaccural	1,531	1,338
Total	178,941	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	6	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	183,056	170,372
30 to 89 Days Past Due	89	448
Nonaccrual	236	195
Total Past Due and Nonaccural	325	643
Total	183,381	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	13,447	14,983
30 to 89 Days Past Due	0	0
Nonaccrual	0	0
Total Past Due and Nonaccural	0	0
Total	13,447	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