ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	$ 4,065,828	$ 3,914,745
Other Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	112,166	95,520
Other Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	98,366	85,822
Commercial and Industrial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	1,426,826	1,405,338
Commercial and Industrial Loans | Working capital lines of credit loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	709,983	690,764
Commercial and Industrial Loans | Non-working capital loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	716,843	714,574
Commercial Real Estate and Multi-family Residential Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	1,670,840	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	286,534	265,544
Commercial Real Estate and Multi-family Residential Loans | Owner occupied loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	573,359	585,969
Commercial Real Estate and Multi-family Residential Loans | Nonowner occupied loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	570,687	520,488
Commercial Real Estate and Multi-family Residential Loans | Multi-family loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	240,260	195,164
Agri-business and Agricultural Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	379,631	370,607
Agri-business and Agricultural Loans | Loans secured by farmland
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	174,389	177,513
Agri-business and Agricultural Loans | Loans for agricultural production
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	205,242	193,094
Consumer 1-4 Family Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	377,999	390,293
Consumer 1-4 Family Mortgage Loans | Closed end first mortgage loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	176,873	185,461
Consumer 1-4 Family Mortgage Loans | Open end and junior lien loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	188,204	188,638
Consumer 1-4 Family Mortgage Loans | Residential construction loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	12,922	16,194
Pass
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	3,490,863	3,324,054
Pass | Other Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	112,166	95,516
Pass | Other Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	27,250	12,700
Pass | Commercial and Industrial Loans | Working capital lines of credit loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	631,728	618,612
Pass | Commercial and Industrial Loans | Non-working capital loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	673,370	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	286,534	264,900
Pass | Commercial Real Estate and Multi-family Residential Loans | Owner occupied loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	535,496	541,734
Pass | Commercial Real Estate and Multi-family Residential Loans | Nonowner occupied loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	569,315	517,356
Pass | Commercial Real Estate and Multi-family Residential Loans | Multi-family loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	240,260	194,948
Pass | Agri-business and Agricultural Loans | Loans secured by farmland
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	165,005	166,623
Pass | Agri-business and Agricultural Loans | Loans for agricultural production
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	191,489	183,189
Pass | Consumer 1-4 Family Mortgage Loans | Closed end first mortgage loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	47,405	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	10,845	8,810
Pass | Consumer 1-4 Family Mortgage Loans | Residential construction 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	96,608	101,418
Special Mention | Other Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Special Mention | Other Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Special Mention | Commercial and Industrial Loans | Working capital lines of credit loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	40,551	43,240
Special Mention | Commercial and Industrial Loans | Non-working capital loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	18,782	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	0	353
Special Mention | Commercial Real Estate and Multi-family Residential Loans | Owner occupied loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	14,804	21,864
Special Mention | Commercial Real Estate and Multi-family Residential Loans | Nonowner occupied loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	781	2,491
Special Mention | Commercial Real Estate and Multi-family Residential Loans | Multi-family loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	216
Special Mention | Agri-business and Agricultural Loans | Loans secured by farmland
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	7,952	9,107
Special Mention | Agri-business and Agricultural Loans | Loans for agricultural production
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	13,738	8,155
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 loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	84,562	85,232
Substandard | Other Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Substandard | Other Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	17	44
Substandard | Commercial and Industrial Loans | Working capital lines of credit loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	37,278	28,563
Substandard | Commercial and Industrial Loans | Non-working capital loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	19,381	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	23,059	22,371
Substandard | Commercial Real Estate and Multi-family Residential Loans | Nonowner occupied loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	591	641
Substandard | Commercial Real Estate and Multi-family Residential Loans | Multi-family loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Substandard | Agri-business and Agricultural Loans | Loans secured by farmland
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	1,432	1,783
Substandard | Agri-business and Agricultural Loans | Loans for agricultural production
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	15	1,750
Substandard | Consumer 1-4 Family Mortgage Loans | Closed end first mortgage loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	1,976	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	762	220
Substandard | Consumer 1-4 Family Mortgage Loans | Residential construction loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	51	0
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful | Other Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	0
Doubtful | Other Consumer Loans
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	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 | Multi-family loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	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 | 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 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	393,795	404,041
Not Rated | Other Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	4
Not Rated | Other Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	71,099	73,078
Not Rated | Commercial and Industrial Loans | Working capital lines of credit loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	426	349
Not Rated | Commercial and Industrial Loans | Non-working capital loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	5,310	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	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 | Multi-family loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	0	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 | Consumer 1-4 Family Mortgage Loans | Closed end first mortgage loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	127,492	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	176,597	179,608
Not Rated | Consumer 1-4 Family Mortgage Loans | Residential construction loans
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance	$ 12,871	$ 16,194