ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	$ 3,922,736	$ 3,897,455
30 to 89 Days Past Due	9,697	10,025
Greater than 90 Days Past Due and Still Accruing	481	0
Nonaccrual	6,096	7,265
Total Past Due and Nonaccural	16,274	17,290
Total	3,939,010	3,914,745
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total	1,427,348	1,405,338
Commercial and Industrial Loans [Member] | Working Capital Lines Of Credit Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	720,597	684,191
30 to 89 Days Past Due	4,308	4,328
Greater than 90 Days Past Due and Still Accruing	0	0
Nonaccrual	2,118	2,245
Total Past Due and Nonaccural	6,426	6,573
Total	727,023	690,764
Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	695,711	709,629
30 to 89 Days Past Due	3,354	3,368
Greater than 90 Days Past Due and Still Accruing	0	0
Nonaccrual	1,260	1,577
Total Past Due and Nonaccural	4,614	4,945
Total	700,325	714,574
Commercial Real Estate and Multi-Family Residential Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total	1,627,035	1,567,165
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	292,627	265,544
30 to 89 Days Past Due	0	0
Greater than 90 Days Past Due and Still Accruing	0	0
Nonaccrual	0	0
Total Past Due and Nonaccural	0	0
Total	292,627	265,544
Commercial Real Estate and Multi-Family Residential Loans [Member] | Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	554,668	583,214
30 to 89 Days Past Due	47	486
Greater than 90 Days Past Due and Still Accruing	481	0
Nonaccrual	1,749	2,269
Total Past Due and Nonaccural	2,277	2,755
Total	556,945	585,969
Commercial Real Estate and Multi-Family Residential Loans [Member] | Nonowner Occupied Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	536,900	520,431
30 to 89 Days Past Due	142	57
Greater than 90 Days Past Due and Still Accruing	0	0
Nonaccrual	0	0
Total Past Due and Nonaccural	142	57
Total	537,042	520,488
Commercial Real Estate and Multi-Family Residential Loans [Member] | Multi-family Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	240,421	195,164
30 to 89 Days Past Due	0	0
Greater than 90 Days Past Due and Still Accruing	0	0
Nonaccrual	0	0
Total Past Due and Nonaccural	0	0
Total	240,421	195,164
Agri-business and Agricultural Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total	302,406	370,607
Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	139,230	177,080
30 to 89 Days Past Due	147	150
Greater than 90 Days Past Due and Still Accruing	0	0
Nonaccrual	283	283
Total Past Due and Nonaccural	430	433
Total	139,660	177,513
Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	162,746	193,094
30 to 89 Days Past Due	0	0
Greater than 90 Days Past Due and Still Accruing	0	0
Nonaccrual	0	0
Total Past Due and Nonaccural	0	0
Total	162,746	193,094
Agri-business and Agricultural Loans [Member] | Other Commercial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	111,875	95,520
30 to 89 Days Past Due	0	0
Greater than 90 Days Past Due and Still Accruing	0	0
Nonaccrual	0	0
Total Past Due and Nonaccural	0	0
Total	111,875	95,520
Consumer 1-4 Family Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total	385,935	390,293
Consumer 1-4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	186,373	183,420
30 to 89 Days Past Due	1,466	1,370
Greater than 90 Days Past Due and Still Accruing	0	0
Nonaccrual	588	671
Total Past Due and Nonaccural	2,054	2,041
Total	188,427	185,461
Consumer 1-4 Family Mortgage Loans [Member] | Open End and Junior Lien Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	184,217	188,320
30 to 89 Days Past Due	87	98
Greater than 90 Days Past Due and Still Accruing	0	0
Nonaccrual	98	220
Total Past Due and Nonaccural	185	318
Total	184,402	188,638
Consumer 1-4 Family Mortgage Loans [Member] | Residential Construction Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	13,106	16,194
30 to 89 Days Past Due	0	0
Greater than 90 Days Past Due and Still Accruing	0	0
Nonaccrual	0	0
Total Past Due and Nonaccural	0	0
Total	13,106	16,194
Consumer 1-4 Family Mortgage Loans [Member] | Other consumer loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	84,265	85,654
30 to 89 Days Past Due	146	168
Greater than 90 Days Past Due and Still Accruing	0	0
Nonaccrual	0	0
Total Past Due and Nonaccural	146	168
Total	$ 84,411	$ 85,822