ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY - Aging Of The Recorded Investment In Past Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	$ 4,635,787	$ 4,045,634
Past Due	1,267	1,474
Financing Receivable, 90 Days or More Past Due, Still Accruing	116	45
Nonaccrual	11,986	18,675
Total Past Due and Nonaccrual	13,369	20,194
Total ending loans balance	4,649,156	4,065,828
Other Commercial Loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	93,912	112,166
Past Due	0	0
Nonaccrual	0	0
Total Past Due and Nonaccrual	0	0
Total ending loans balance	93,912	112,166
Other Commercial Loans | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total ending loans balance	1,784,926	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	625,493	703,737
Past Due	0	10
Nonaccrual	606	6,236
Total Past Due and Nonaccrual	606	6,246
Total ending loans balance	626,099	709,983
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]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	1,153,540	710,557
Past Due	0	4
Nonaccrual	5,287	6,282
Total Past Due and Nonaccrual	5,287	6,286
Total ending loans balance	1,158,827	716,843
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]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Commercial Real Estate and Multi-family Residential Loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Total ending loans balance	1,892,572	1,670,840
Commercial Real Estate and Multi-family Residential Loans | Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	361,664	286,534
Past Due	0	0
Nonaccrual	0	0
Total Past Due and Nonaccrual	0	0
Total ending loans balance	361,664	286,534
Commercial Real Estate and Multi-family Residential Loans | Construction and Land Development Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Commercial Real Estate and Multi-family Residential Loans | Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	642,527	569,303
Past Due	0	0
Nonaccrual	5,047	4,056
Total Past Due and Nonaccrual	5,047	4,056
Total ending loans balance	647,574	573,359
Commercial Real Estate and Multi-family Residential Loans | Owner Occupied Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Commercial Real Estate and Multi-family Residential Loans | Nonowner Occupied Loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	579,050	570,687
Past Due	0	0
Nonaccrual	0	0
Total Past Due and Nonaccrual	0	0
Total ending loans balance	579,050	570,687
Commercial Real Estate and Multi-family Residential Loans | Nonowner Occupied Loans | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Commercial Real Estate and Multi-family Residential Loans | Multifamily Loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	304,284	240,260
Past Due	0	0
Nonaccrual	0	0
Total Past Due and Nonaccrual	0	0
Total ending loans balance	304,284	240,260
Commercial Real Estate and Multi-family Residential Loans | Multifamily Loans | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Agri-business and Agricultural Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total ending loans balance	429,662	379,631
Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	194,935	173,959
Past Due	0	0
Nonaccrual	428	430
Total Past Due and Nonaccrual	428	430
Total ending loans balance	195,363	174,389
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]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	234,191	205,228
Past Due	108	0
Nonaccrual	0	14
Total Past Due and Nonaccrual	108	14
Total ending loans balance	234,299	205,242
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]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Consumer 1-4 Family Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total ending loans balance	344,699	377,999
Consumer 1-4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	165,895	174,902
Past Due	877	1,099
Financing Receivable, 90 Days or More Past Due, Still Accruing	116	45
Nonaccrual	613	827
Total Past Due and Nonaccrual	1,606	1,971
Total ending loans balance	167,501	176,873
Consumer 1-4 Family Mortgage Loans [Member] | Home equity mortgage open-ended revolving lines
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due		12,870
Past Due		0
Nonaccrual		52
Total Past Due and Nonaccrual		52
Total ending loans balance	11,962	12,922
Consumer 1-4 Family Mortgage Loans [Member] | Home equity mortgage open-ended revolving lines | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, 90 Days or More Past Due, Still Accruing		0
Consumer 1-4 Family Mortgage Loans [Member] | Open End and Junior Lien Loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	165,094	187,255
Past Due	137	188
Nonaccrual	5	761
Total Past Due and Nonaccrual	142	949
Total ending loans balance	165,236	188,204
Consumer 1-4 Family Mortgage Loans [Member] | Open End and Junior Lien Loans | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Consumer 1-4 Family Mortgage Loans [Member] | Residential Construction and Land Development Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	11,962
Past Due	0
Nonaccrual	0
Total Past Due and Nonaccrual	0
Total ending loans balance	11,962	12,922
Consumer 1-4 Family Mortgage Loans [Member] | 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]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0
Consumer 1-4 Family Mortgage Loans [Member] | Other consumer loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	103,240	98,176
Past Due	145	173
Nonaccrual	0	17
Total Past Due and Nonaccrual	145	190
Total ending loans balance	103,385	98,366
Consumer 1-4 Family Mortgage Loans [Member] | Other consumer loans | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, 90 Days or More Past Due, Still Accruing	$ 0	$ 0