ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Credit Quality Indicators) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	$ 3,998,618	$ 3,914,745
Other Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	103,949	95,520
Commercial and Industrial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	1,450,361	1,405,338
Commercial and Industrial Loans | Working Capital Lines of Credit Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	755,246	690,764
Commercial and Industrial Loans | Non-working Capital Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	695,115	714,574
Commercial Real Estate and Multi-family Residential Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	1,653,047	1,567,165
Commercial Real Estate and Multi-family Residential Loans | Construction and Land Development Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	320,404	265,544
Commercial Real Estate and Multi-family Residential Loans | Owner Occupied Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	556,792	585,969
Commercial Real Estate and Multi-family Residential Loans | Nonowner Occupied Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	533,318	520,488
Commercial Real Estate and Multi-family Residential Loans | Multifamily Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	242,533	195,164
Commercial Real Estate and Multi-family Residential Loans | Other Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance		585,969
Agri-business and Agricultural Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	314,583	370,607
Agri-business and Agricultural Loans | Loans Secured By Farmland
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	148,899	177,513
Agri-business and Agricultural Loans | Loans For Agricultural Production
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	165,684	193,094
Agri-business and Agricultural Loans | Other Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	103,949	95,520
Consumer 1-4 Family Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	389,929	390,293
Consumer 1-4 Family Mortgage Loans | Other Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	86,749	85,822
Consumer 1-4 Family Mortgage Loans | Closed End First Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	187,508	185,461
Consumer 1-4 Family Mortgage Loans | Open End And Junior Lien Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	190,187	188,638
Consumer 1-4 Family Mortgage Loans | Residential Construction and Land Development Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	12,234	16,194
Pass
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	3,390,147	3,324,054
Pass | Commercial and Industrial Loans | Working Capital Lines of Credit Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	660,816	618,612
Pass | Commercial and Industrial Loans | Non-working Capital Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	645,632	664,787
Pass | Commercial Real Estate and Multi-family Residential Loans | Construction and Land Development Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	320,115	264,900
Pass | Commercial Real Estate and Multi-family Residential Loans | Owner Occupied Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	517,431
Pass | Commercial Real Estate and Multi-family Residential Loans | Nonowner Occupied Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	530,491	517,356
Pass | Commercial Real Estate and Multi-family Residential Loans | Multifamily Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	242,329	194,948
Pass | Commercial Real Estate and Multi-family Residential Loans | Other Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance		541,734
Pass | Agri-business and Agricultural Loans | Loans Secured By Farmland
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	134,805	166,623
Pass | Agri-business and Agricultural Loans | Loans For Agricultural Production
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	153,961	183,189
Pass | Agri-business and Agricultural Loans | Other Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	103,945	95,516
Pass | Consumer 1-4 Family Mortgage Loans | Other Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	14,077	12,700
Pass | Consumer 1-4 Family Mortgage Loans | Closed End First Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	55,538	54,879
Pass | Consumer 1-4 Family Mortgage Loans | Open End And Junior Lien Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	11,007	8,810
Pass | Consumer 1-4 Family Mortgage Loans | Residential Construction and Land Development Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	144,524	101,418
Special Mention | Commercial and Industrial Loans | Working Capital Lines of Credit Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	70,866	43,240
Special Mention | Commercial and Industrial Loans | Non-working Capital Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	25,350	15,992
Special Mention | Commercial Real Estate and Multi-family Residential Loans | Construction and Land Development Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	289	353
Special Mention | Commercial Real Estate and Multi-family Residential Loans | Owner Occupied Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	21,043
Special Mention | Commercial Real Estate and Multi-family Residential Loans | Nonowner Occupied Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	2,209	2,491
Special Mention | Commercial Real Estate and Multi-family Residential Loans | Multifamily Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	204	216
Special Mention | Commercial Real Estate and Multi-family Residential Loans | Other Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance		21,864
Special Mention | Agri-business and Agricultural Loans | Loans Secured By Farmland
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	12,840	9,107
Special Mention | Agri-business and Agricultural Loans | Loans For Agricultural Production
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	11,723	8,155
Special Mention | Agri-business and Agricultural Loans | Other Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Special Mention | Consumer 1-4 Family Mortgage Loans | Other Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Special Mention | Consumer 1-4 Family Mortgage Loans | Closed End First Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Special Mention | Consumer 1-4 Family Mortgage Loans | Open End And Junior Lien Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Special Mention | Consumer 1-4 Family Mortgage Loans | Residential Construction and Land Development Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	62,388	85,232
Substandard | Commercial and Industrial Loans | Working Capital Lines of Credit Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	23,244	28,563
Substandard | Commercial and Industrial Loans | Non-working Capital Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	18,804	27,548
Substandard | Commercial Real Estate and Multi-family Residential Loans | Construction and Land Development Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	291
Substandard | Commercial Real Estate and Multi-family Residential Loans | Owner Occupied Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	18,318
Substandard | Commercial Real Estate and Multi-family Residential Loans | Nonowner Occupied Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	618	641
Substandard | Commercial Real Estate and Multi-family Residential Loans | Multifamily Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Substandard | Commercial Real Estate and Multi-family Residential Loans | Other Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance		22,371
Substandard | Agri-business and Agricultural Loans | Loans Secured By Farmland
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	1,254	1,783
Substandard | Agri-business and Agricultural Loans | Loans For Agricultural Production
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	1,750
Substandard | Agri-business and Agricultural Loans | Other Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Substandard | Consumer 1-4 Family Mortgage Loans | Other Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	44
Substandard | Consumer 1-4 Family Mortgage Loans | Closed End First Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	95	2,021
Substandard | Consumer 1-4 Family Mortgage Loans | Open End And Junior Lien Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	55	220
Substandard | Consumer 1-4 Family Mortgage Loans | Residential Construction and Land Development Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful | Commercial and Industrial Loans | Working Capital Lines of Credit Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful | Commercial and Industrial Loans | Non-working Capital Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful | Commercial Real Estate and Multi-family Residential Loans | Construction and Land Development Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful | Commercial Real Estate and Multi-family Residential Loans | Owner Occupied Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0
Doubtful | Commercial Real Estate and Multi-family Residential Loans | Nonowner Occupied Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful | Commercial Real Estate and Multi-family Residential Loans | Multifamily Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful | Commercial Real Estate and Multi-family Residential Loans | Other Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance		0
Doubtful | Agri-business and Agricultural Loans | Loans Secured By Farmland
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful | Agri-business and Agricultural Loans | Loans For Agricultural Production
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful | Agri-business and Agricultural Loans | Other Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful | Consumer 1-4 Family Mortgage Loans | Other Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful | Consumer 1-4 Family Mortgage Loans | Closed End First Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful | Consumer 1-4 Family Mortgage Loans | Open End And Junior Lien Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful | Consumer 1-4 Family Mortgage Loans | Residential Construction and Land Development Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Not Rated
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	401,559	404,041
Not Rated | Commercial and Industrial Loans | Working Capital Lines of Credit Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	320	349
Not Rated | Commercial and Industrial Loans | Non-working Capital Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	5,329	6,247
Not Rated | Commercial Real Estate and Multi-family Residential Loans | Construction and Land Development Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Not Rated | Commercial Real Estate and Multi-family Residential Loans | Owner Occupied Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0
Not Rated | Commercial Real Estate and Multi-family Residential Loans | Nonowner Occupied Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Not Rated | Commercial Real Estate and Multi-family Residential Loans | Multifamily Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Not Rated | Commercial Real Estate and Multi-family Residential Loans | Other Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance		0
Not Rated | Agri-business and Agricultural Loans | Loans Secured By Farmland
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Not Rated | Agri-business and Agricultural Loans | Loans For Agricultural Production
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Not Rated | Agri-business and Agricultural Loans | Other Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	4	4
Not Rated | Consumer 1-4 Family Mortgage Loans | Other Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	72,672	73,078
Not Rated | Consumer 1-4 Family Mortgage Loans | Closed End First Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	131,875	128,561
Not Rated | Consumer 1-4 Family Mortgage Loans | Open End And Junior Lien Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	179,125	179,608
Not Rated | Consumer 1-4 Family Mortgage Loans | Residential Construction and Land Development Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	$ 12,234	$ 16,194