LOANS - Total Loans Outstanding (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable
Total Commercial And Consumer Loans	$ 4,657,183	$ 4,067,385
Less: Allowance for loan losses	(61,408)	(50,652)	$ (48,453)	$ (47,121)
Net deferred loan fees	(8,027)	(1,557)
Loans, net	4,587,748	4,015,176
Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable
Total Commercial And Consumer Loans	4,210,049	3,592,023
Other consumer loans
Accounts, Notes, Loans and Financing Receivable
Total Commercial And Consumer Loans	103,616	98,617
Consumer loan open-ended revolving lines
Accounts, Notes, Loans and Financing Receivable
Total Commercial And Consumer Loans	447,134	475,362
Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable
Less: Allowance for loan losses	(28,333)	(25,789)	(22,518)	(21,097)
Commercial and Industrial Loans [Member] | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable
Total Commercial And Consumer Loans	1,791,378	1,426,868
Commercial and Industrial Loans [Member] | Working Capital Lines of Credit Loans [Member]
Accounts, Notes, Loans and Financing Receivable
Total Commercial And Consumer Loans	626,023	709,849
Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member]
Accounts, Notes, Loans and Financing Receivable
Total Commercial And Consumer Loans	1,165,355	717,019
Commercial Real Estate and Multi-family Residential Loans [Member] | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable
Total Commercial And Consumer Loans	1,895,014	1,673,322
Commercial Real Estate and Multi-family Residential Loans [Member] | Construction and Land Development Loans [Member]
Accounts, Notes, Loans and Financing Receivable
Total Commercial And Consumer Loans	362,653	287,641
Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member]
Accounts, Notes, Loans and Financing Receivable
Total Commercial And Consumer Loans	648,019	573,665
Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans
Accounts, Notes, Loans and Financing Receivable
Total Commercial And Consumer Loans	579,625	571,364
Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans
Accounts, Notes, Loans and Financing Receivable
Total Commercial And Consumer Loans	304,717	240,652
Agri-business and Agricultural Loans [Member]
Accounts, Notes, Loans and Financing Receivable
Less: Allowance for loan losses	(3,043)	(3,869)	$ (4,305)	$ (4,920)
Agri-business and Agricultural Loans [Member] | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable
Total Commercial And Consumer Loans	429,644	379,531
Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable
Total Commercial And Consumer Loans	195,410	174,380
Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable
Total Commercial And Consumer Loans	234,234	205,151
Other Commercial Loans | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable
Total Commercial And Consumer Loans	94,013	112,302
Total Consumer 1 To 4 Family Mortgage Loans
Accounts, Notes, Loans and Financing Receivable
Total Commercial And Consumer Loans	343,518	376,745
Total Consumer 1 To 4 Family Mortgage Loans | Closed End First Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable
Total Commercial And Consumer Loans	167,847	177,227
Total Consumer 1 To 4 Family Mortgage Loans | Open End And Junior Lien Loans [Member]
Accounts, Notes, Loans and Financing Receivable
Total Commercial And Consumer Loans	163,664	186,552
Total Consumer 1 To 4 Family Mortgage Loans | Residential Construction and Land Development Loans
Accounts, Notes, Loans and Financing Receivable
Total Commercial And Consumer Loans	$ 12,007	$ 12,966