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ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY - Aging Of The Recorded Investment In Past Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	$ 4,475,048	$ 4,045,634
Nonaccrual	14,779	18,675
Total Past Due and Nonaccrual	15,484	20,194
Total ending loans balance	4,490,532	4,065,828
Financial Asset, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	686	1,474
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	19	45
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
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, Aging [Abstract]
Loans Not Past Due	566,602	703,737
Nonaccrual	2,079	6,236
Total Past Due and Nonaccrual	2,087	6,246
Total ending loans balance	568,689	709,983
Commercial and Industrial Loans [Member] | Working Capital Lines of Credit Loans [Member] | Financial Asset, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	8	10
Commercial and Industrial Loans [Member] | Working Capital Lines of Credit Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	0	0
Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	1,219,488	710,557
Nonaccrual	5,611	6,282
Total Past Due and Nonaccrual	5,622	6,286
Total ending loans balance	1,225,110	716,843
Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member] | Financial Asset, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	11	4
Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	0	0
Commercial Real Estate and Multi-family Residential Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
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, Aging [Abstract]
Loans Not Past Due	359,082	286,534
Nonaccrual	0	0
Total Past Due and Nonaccrual	0	0
Total ending loans balance	359,082	286,534
Commercial Real Estate and Multi-family Residential Loans [Member] | Construction and Land Development Loans [Member] | Financial Asset, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	0	0
Commercial Real Estate and Multi-family Residential Loans [Member] | Construction and Land Development Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	0	0
Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	570,680	569,303
Nonaccrual	5,178	4,056
Total Past Due and Nonaccrual	5,178	4,056
Total ending loans balance	575,858	573,359
Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member] | Financial Asset, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	0	0
Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	0	0
Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	553,894	570,687
Nonaccrual	0	0
Total Past Due and Nonaccrual	0	0
Total ending loans balance	553,894	570,687
Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans | Financial Asset, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	0	0
Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	0	0
Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	290,107	240,260
Nonaccrual	0	0
Total Past Due and Nonaccrual	0	0
Total ending loans balance	290,107	240,260
Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans | Financial Asset, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	0	0
Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	0	0
Agri-business and Agricultural Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total ending loans balance	352,071	379,631
Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	153,298	173,959
Nonaccrual	430	430
Total Past Due and Nonaccrual	430	430
Total ending loans balance	153,728	174,389
Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland | Financial Asset, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	0	0
Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	0	0
Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	198,343	205,228
Nonaccrual	0	14
Total Past Due and Nonaccrual	0	14
Total ending loans balance	198,343	205,242
Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production | Financial Asset, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	0	0
Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	0	0
Agri-business and Agricultural Loans [Member] | Other Commercial Loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	110,712	112,166
Nonaccrual	0	0
Total Past Due and Nonaccrual	0	0
Total ending loans balance	110,712	112,166
Agri-business and Agricultural Loans [Member] | Other Commercial Loans | Financial Asset, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	0	0
Agri-business and Agricultural Loans [Member] | Other Commercial Loans | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	0	0
Agri-business and Agricultural Loans [Member] | Other consumer loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	98,221
Nonaccrual	0
Total Past Due and Nonaccrual	210
Total ending loans balance	98,431
Agri-business and Agricultural Loans [Member] | Other consumer loans | Financial Asset, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	210
Agri-business and Agricultural Loans [Member] | Other consumer loans | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	0
Consumer 14 family mortgage loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Total ending loans balance	356,578	377,999
Consumer 14 family mortgage loans | Other Commercial Loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Total ending loans balance	98,431	98,366
Consumer 14 family mortgage loans | Closed End First Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	168,367	174,902
Nonaccrual	718	827
Total Past Due and Nonaccrual	1,164	1,971
Total ending loans balance	169,531	176,873
Consumer 14 family mortgage loans | Closed End First Mortgage Loans [Member] | Financial Asset, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	427	1,099
Consumer 14 family mortgage loans | Closed End First Mortgage Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	19	45
Consumer 14 family mortgage loans | Open End and Junior Lien Loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	175,183	187,255
Nonaccrual	711	761
Total Past Due and Nonaccrual	741	949
Total ending loans balance	175,924	188,204
Consumer 14 family mortgage loans | Open End and Junior Lien Loans | Financial Asset, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	30	188
Consumer 14 family mortgage loans | Open End and Junior Lien Loans | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	0	0
Consumer 14 family mortgage loans | Residential Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	11,071	12,870
Nonaccrual	52	52
Total Past Due and Nonaccrual	52	52
Total ending loans balance	11,123	12,922
Consumer 14 family mortgage loans | Residential Construction and Land Development Loans [Member] | Financial Asset, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	0	0
Consumer 14 family mortgage loans | Residential Construction and Land Development Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	$ 0	0
Consumer 14 family mortgage loans | Other consumer loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due		98,176
Nonaccrual		17
Total Past Due and Nonaccrual		190
Total ending loans balance		98,366
Consumer 14 family mortgage loans | Other consumer loans | Financial Asset, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		173
Consumer 14 family mortgage loans | Other consumer loans | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		$ 0

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Amount of financing receivable not past due.

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