ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY - Aging Of The Recorded Investment In Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	$ 4,069,839	$ 4,045,634
Nonaccrual	13,883	18,675
Total Past Due and Nonaccural	15,899	20,194
Total	4,085,738	4,065,828
Financial Asset, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	1,945	1,474
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	71	45
Other Commercial Loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	104,163	112,166
Nonaccrual	0	0
Total Past Due and Nonaccural	0	0
Total	104,163	112,166
Other Commercial Loans | Financial Asset, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	0	0
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
Other consumer loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	96,736	98,176
Nonaccrual	0	17
Total Past Due and Nonaccural	123	190
Total	96,859	98,366
Other consumer loans | Financial Asset, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	114	173
Other consumer loans | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	9	0
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total	1,428,646	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	725,870	703,737
Nonaccrual	4,529	6,236
Total Past Due and Nonaccural	4,978	6,246
Total	730,848	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	449	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	693,515	710,557
Nonaccrual	4,184	6,282
Total Past Due and Nonaccural	4,283	6,286
Total	697,798	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	99	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	1,758,212	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	333,699	286,534
Nonaccrual	0	0
Total Past Due and Nonaccural	0	0
Total	333,699	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	568,122	569,303
Nonaccrual	3,186	4,056
Total Past Due and Nonaccural	3,616	4,056
Total	571,738	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	430	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	583,709	570,687
Nonaccrual	0	0
Total Past Due and Nonaccural	0	0
Total	583,709	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	269,066	240,260
Nonaccrual	0	0
Total Past Due and Nonaccural	0	0
Total	269,066	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
Commercial Real Estate and Multi-family Residential Loans [Member] | Other Commercial Loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Total		573,359
Agri-business and Agricultural Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total	329,497	379,631
Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	145,124	173,959
Nonaccrual	430	430
Total Past Due and Nonaccural	430	430
Total	145,554	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	183,943	205,228
Nonaccrual	0	14
Total Past Due and Nonaccural	0	14
Total	183,943	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]
Total	104,163	112,166
Consumer 1-4 Family Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total	368,361	377,999
Consumer 1-4 Family Mortgage Loans [Member] | Other Commercial Loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Total	96,859	98,366
Consumer 1-4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	171,452	174,902
Nonaccrual	819	827
Total Past Due and Nonaccural	1,623	1,971
Total	173,075	176,873
Consumer 1-4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member] | Financial Asset, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	785	1,099
Consumer 1-4 Family Mortgage Loans [Member] | 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 1-4 Family Mortgage Loans [Member] | Home Equity Mortgage Open Ended Revolving Lines [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due	182,388	187,255
Nonaccrual	683	761
Total Past Due and Nonaccural	792	949
Total	183,180	188,204
Consumer 1-4 Family Mortgage Loans [Member] | Home Equity Mortgage Open Ended Revolving Lines [Member] | Financial Asset, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	66	188
Consumer 1-4 Family Mortgage Loans [Member] | Home Equity Mortgage Open Ended Revolving Lines [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	43	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	12,052	12,870
Nonaccrual	52	52
Total Past Due and Nonaccural	54	52
Total	12,106	12,922
Consumer 1-4 Family Mortgage Loans [Member] | Residential Construction and Land Development Loans [Member] | Financial Asset, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due	2	0
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]
Past Due	$ 0	$ 0