ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Credit Quality Indicators) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	$ 3,939,010	$ 3,914,745
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	1,427,348	1,405,338
Commercial and Industrial Loans [Member] | Working Capital Lines of Credit Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	727,023	690,764
Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	700,325	714,574
Commercial Real Estate and Multi-family Residential Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	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 [Line Items]
Total ending loans balance	292,627	265,544
Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	556,945	585,969
Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	537,042	520,488
Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	240,421	195,164
Agri-business and Agricultural Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	302,406	370,607
Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	139,660	177,513
Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	162,746	193,094
Agri-business and Agricultural Loans [Member] | Other Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	111,875	95,520
Consumer 1-4 Family Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	385,935	390,293
Consumer 1-4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	188,427	185,461
Consumer 1-4 Family Mortgage Loans [Member] | Open End And Junior Lien Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	184,402	188,638
Consumer 1-4 Family Mortgage Loans [Member] | Residential Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	13,106	16,194
Consumer 1-4 Family Mortgage Loans [Member] | Other Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	84,411	85,822
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	3,337,818	3,324,054
Pass [Member] | Commercial and Industrial Loans [Member] | Working Capital Lines of Credit Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	638,075	618,612
Pass [Member] | Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	651,748	664,787
Pass [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	292,275	264,900
Pass [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	509,539	541,734
Pass [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	533,975	517,356
Pass [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	240,211	194,948
Pass [Member] | Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	128,492	166,623
Pass [Member] | Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	153,470	183,189
Pass [Member] | Agri-business and Agricultural Loans [Member] | Other Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	111,871	95,516
Pass [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	56,681	54,879
Pass [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Open End And Junior Lien Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	8,613	8,810
Pass [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Residential Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Pass [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Other Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	12,868	12,700
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	121,101	101,418
Special Mention [Member] | Commercial and Industrial Loans [Member] | Working Capital Lines of Credit Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	59,140	43,240
Special Mention [Member] | Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	17,072	15,992
Special Mention [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	352	353
Special Mention [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	25,024	21,864
Special Mention [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	2,439	2,491
Special Mention [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	210	216
Special Mention [Member] | Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	9,388	9,107
Special Mention [Member] | Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	7,476	8,155
Special Mention [Member] | Agri-business and Agricultural Loans [Member] | Other Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Special Mention [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Special Mention [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Open End And Junior Lien Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Special Mention [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Residential Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Special Mention [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Other Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	83,776	85,232
Substandard [Member] | Commercial and Industrial Loans [Member] | Working Capital Lines of Credit Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	29,489	28,563
Substandard [Member] | Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	25,632	27,548
Substandard [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	291
Substandard [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	22,382	22,371
Substandard [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	628	641
Substandard [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Substandard [Member] | Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	1,780	1,783
Substandard [Member] | Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	1,800	1,750
Substandard [Member] | Agri-business and Agricultural Loans [Member] | Other Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Substandard [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	1,924	2,021
Substandard [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Open End And Junior Lien Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	98	220
Substandard [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Residential Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Substandard [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Other Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	43	44
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful [Member] | Commercial and Industrial Loans [Member] | Working Capital Lines of Credit Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful [Member] | Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful [Member] | Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful [Member] | Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful [Member] | Agri-business and Agricultural Loans [Member] | Other Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Open End And Junior Lien Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Residential Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Other Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Not Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	396,315	404,041
Not Rated [Member] | Commercial and Industrial Loans [Member] | Working Capital Lines of Credit Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	319	349
Not Rated [Member] | Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	5,873	6,247
Not Rated [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Not Rated [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Not Rated [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Not Rated [Member] | Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Not Rated [Member] | Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Not Rated [Member] | Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Not Rated [Member] | Agri-business and Agricultural Loans [Member] | Other Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	4	4
Not Rated [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	129,822	128,561
Not Rated [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Open End And Junior Lien Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	175,691	179,608
Not Rated [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Residential Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	13,106	16,194
Not Rated [Member] | Consumer 1-4 Family Mortgage Loans [Member] | Other Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	$ 71,500	$ 73,078