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ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment
Total ending loans balance	$ 4,490,532	$ 4,065,828
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	1,793,799	1,426,826
Commercial and Industrial Loans [Member] | Working Capital Lines of Credit Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	568,689	709,983
Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	1,225,110	716,843
Commercial Real Estate and Multi-family Residential Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	1,778,941	1,670,840
Commercial Real Estate and Multi-family Residential Loans [Member] | Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	359,082	286,534
Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	575,858	573,359
Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans
Financing Receivable, Recorded Investment
Total ending loans balance	553,894	570,687
Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans
Financing Receivable, Recorded Investment
Total ending loans balance	290,107	240,260
Agri-business and Agricultural Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	352,071	379,631
Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland
Financing Receivable, Recorded Investment
Total ending loans balance	153,728	174,389
Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production
Financing Receivable, Recorded Investment
Total ending loans balance	198,343	205,242
Agri-business and Agricultural Loans [Member] | Other Commercial Loans
Financing Receivable, Recorded Investment
Total ending loans balance	110,712	112,166
Consumer 14 family mortgage loans
Financing Receivable, Recorded Investment
Total ending loans balance	356,578	377,999
Consumer 14 family mortgage loans | Other Commercial Loans
Financing Receivable, Recorded Investment
Total ending loans balance	98,431	98,366
Consumer 14 family mortgage loans | Closed End First Mortgage Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	169,531	176,873
Consumer 14 family mortgage loans | Open End And Junior Lien Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	175,924	188,204
Consumer 14 family mortgage loans | Residential Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	11,123	12,922
Pass
Financing Receivable, Recorded Investment
Total ending loans balance	3,898,239	3,490,863
Pass | Commercial and Industrial Loans [Member] | Working Capital Lines of Credit Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	517,324	631,728
Pass | Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	1,176,307	673,370
Pass | Commercial Real Estate and Multi-family Residential Loans [Member] | Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	359,082	286,534
Pass | Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	537,145	535,496
Pass | Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans
Financing Receivable, Recorded Investment
Total ending loans balance	546,936	569,315
Pass | Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans
Financing Receivable, Recorded Investment
Total ending loans balance	290,107	240,260
Pass | Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland
Financing Receivable, Recorded Investment
Total ending loans balance	140,131	165,005
Pass | Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production
Financing Receivable, Recorded Investment
Total ending loans balance	146,520	191,489
Pass | Agri-business and Agricultural Loans [Member] | Other Commercial Loans
Financing Receivable, Recorded Investment
Total ending loans balance	110,712	112,166
Pass | Consumer 14 family mortgage loans | Other Commercial Loans
Financing Receivable, Recorded Investment
Total ending loans balance	28,047	27,250
Pass | Consumer 14 family mortgage loans | Closed End First Mortgage Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	37,353	47,405
Pass | Consumer 14 family mortgage loans | Open End And Junior Lien Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	8,575	10,845
Pass | Consumer 14 family mortgage loans | Residential Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	1	0
Special Mention
Financing Receivable, Recorded Investment
Total ending loans balance	150,839	96,608
Special Mention | Commercial and Industrial Loans [Member] | Working Capital Lines of Credit Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	31,787	40,551
Special Mention | Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	22,205	18,782
Special Mention | Commercial Real Estate and Multi-family Residential Loans [Member] | Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Special Mention | Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	26,493	14,804
Special Mention | Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans
Financing Receivable, Recorded Investment
Total ending loans balance	6,395	781
Special Mention | Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Special Mention | Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland
Financing Receivable, Recorded Investment
Total ending loans balance	12,136	7,952
Special Mention | Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production
Financing Receivable, Recorded Investment
Total ending loans balance	51,823	13,738
Special Mention | Agri-business and Agricultural Loans [Member] | Other Commercial Loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Special Mention | Consumer 14 family mortgage loans | Other Commercial Loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Special Mention | Consumer 14 family mortgage loans | Closed End First Mortgage Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Special Mention | Consumer 14 family mortgage loans | Open End And Junior Lien Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Special Mention | Consumer 14 family mortgage loans | Residential Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Substandard
Financing Receivable, Recorded Investment
Total ending loans balance	57,371	84,562
Substandard | Commercial and Industrial Loans [Member] | Working Capital Lines of Credit Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	19,254	37,278
Substandard | Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	21,258	19,381
Substandard | Commercial Real Estate and Multi-family Residential Loans [Member] | Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Substandard | Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	12,220	23,059
Substandard | Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans
Financing Receivable, Recorded Investment
Total ending loans balance	563	591
Substandard | Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Substandard | Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland
Financing Receivable, Recorded Investment
Total ending loans balance	1,461	1,432
Substandard | Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production
Financing Receivable, Recorded Investment
Total ending loans balance	0	15
Substandard | Agri-business and Agricultural Loans [Member] | Other Commercial Loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Substandard | Consumer 14 family mortgage loans | Other Commercial Loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	17
Substandard | Consumer 14 family mortgage loans | Closed End First Mortgage Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	1,852	1,976
Substandard | Consumer 14 family mortgage loans | Open End And Junior Lien Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	711	762
Substandard | Consumer 14 family mortgage loans | Residential Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	52	51
Doubtful
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Doubtful | Commercial and Industrial Loans [Member] | Working Capital Lines of Credit Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Doubtful | Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Doubtful | Commercial Real Estate and Multi-family Residential Loans [Member] | Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Doubtful | Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Doubtful | Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Doubtful | Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Doubtful | Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Doubtful | Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Doubtful | Agri-business and Agricultural Loans [Member] | Other Commercial Loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Doubtful | Consumer 14 family mortgage loans | Other Commercial Loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Doubtful | Consumer 14 family mortgage loans | Closed End First Mortgage Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Doubtful | Consumer 14 family mortgage loans | Open End And Junior Lien Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Doubtful | Consumer 14 family mortgage loans | Residential Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Not Rated
Financing Receivable, Recorded Investment
Total ending loans balance	384,083	393,795
Not Rated | Commercial and Industrial Loans [Member] | Working Capital Lines of Credit Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	324	426
Not Rated | Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	5,340	5,310
Not Rated | Commercial Real Estate and Multi-family Residential Loans [Member] | Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Not Rated | Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Not Rated | Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Not Rated | Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Not Rated | Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Not Rated | Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Not Rated | Agri-business and Agricultural Loans [Member] | Other Commercial Loans
Financing Receivable, Recorded Investment
Total ending loans balance	0	0
Not Rated | Consumer 14 family mortgage loans | Other Commercial Loans
Financing Receivable, Recorded Investment
Total ending loans balance	70,384	71,099
Not Rated | Consumer 14 family mortgage loans | Closed End First Mortgage Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	130,326	127,492
Not Rated | Consumer 14 family mortgage loans | Open End And Junior Lien Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	166,638	176,597
Not Rated | Consumer 14 family mortgage loans | Residential Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment
Total ending loans balance	$ 11,071	$ 12,871

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+ References

No definition available.

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- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524

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