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ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Aging Of The Recorded Investment In Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due		$ 4,635,787
Nonaccrual		11,986
Total Past Due and Nonaccrual		13,369
Total ending loans balance	$ 4,474,631	4,649,156
Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		1,267
Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		116
Other consumer loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Total ending loans balance	98,835
Commercial and industrial loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Total ending loans balance		1,784,926
Commercial and industrial loans | Working capital lines of credit loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due		625,493
Nonaccrual		606
Total Past Due and Nonaccrual		606
Total ending loans balance	574,696	626,099
Commercial and industrial loans | Working capital lines of credit loans | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		0
Commercial and industrial loans | Working capital lines of credit loans | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		0
Commercial and industrial loans | Non-working capital loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due		1,153,540
Nonaccrual		5,287
Total Past Due and Nonaccrual		5,287
Total ending loans balance	1,093,471	1,158,827
Commercial and industrial loans | Non-working capital loans | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		0
Commercial and industrial loans | Non-working capital loans | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		0
Commercial real estate and multi-family residential loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Total ending loans balance		1,892,572
Commercial real estate and multi-family residential loans | Construction and land development loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due		361,664
Nonaccrual		0
Total Past Due and Nonaccrual		0
Total ending loans balance	369,633	361,664
Commercial real estate and multi-family residential loans | Construction and land development loans | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		0
Commercial real estate and multi-family residential loans | Construction and land development loans | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		0
Commercial real estate and multi-family residential loans | Owner occupied loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due		642,527
Nonaccrual		5,047
Total Past Due and Nonaccrual		5,047
Total ending loans balance	668,934	647,574
Commercial real estate and multi-family residential loans | Owner occupied loans | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		0
Commercial real estate and multi-family residential loans | Owner occupied loans | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		0
Commercial real estate and multi-family residential loans | Nonowner Occupied Loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due		579,050
Nonaccrual		0
Total Past Due and Nonaccrual		0
Total ending loans balance	605,036	579,050
Commercial real estate and multi-family residential loans | Nonowner Occupied Loans | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		0
Commercial real estate and multi-family residential loans | Nonowner Occupied Loans | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		0
Commercial real estate and multi-family residential loans | Multifamily Loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due		304,284
Nonaccrual		0
Total Past Due and Nonaccrual		0
Total ending loans balance	300,996	304,284
Commercial real estate and multi-family residential loans | Multifamily Loans | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		0
Commercial real estate and multi-family residential loans | Multifamily Loans | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		0
Agri-business and agricultural loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Total ending loans balance		429,662
Agri-business and agricultural loans | Loans Secured By Farmland
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due		194,935
Nonaccrual		428
Total Past Due and Nonaccrual		428
Total ending loans balance	154,786	195,363
Agri-business and agricultural loans | Loans Secured By Farmland | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		0
Agri-business and agricultural loans | Loans Secured By Farmland | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		0
Agri-business and agricultural loans | Loans For Agricultural Production
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due		234,191
Nonaccrual		0
Total Past Due and Nonaccrual		108
Total ending loans balance	192,412	234,299
Agri-business and agricultural loans | Loans For Agricultural Production | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		108
Agri-business and agricultural loans | Loans For Agricultural Production | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		0
Agri-business and agricultural loans | Other commercial loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due		93,912
Nonaccrual		0
Total Past Due and Nonaccrual		0
Total ending loans balance		93,912
Agri-business and agricultural loans | Other commercial loans | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		0
Agri-business and agricultural loans | Other commercial loans | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		0
Consumer 1-4 family loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Total ending loans balance		344,699
Consumer 1-4 family loans | Closed end first mortgage loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due		165,895
Nonaccrual		613
Total Past Due and Nonaccrual		1,606
Total ending loans balance	161,240	167,501
Consumer 1-4 family loans | Closed end first mortgage loans | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		877
Consumer 1-4 family loans | Closed end first mortgage loans | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		116
Consumer 1-4 family loans | Open End and Junior Lien Loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due		165,094
Nonaccrual		5
Total Past Due and Nonaccrual		142
Total ending loans balance		165,236
Consumer 1-4 family loans | Open End and Junior Lien Loans | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		137
Consumer 1-4 family loans | Open End and Junior Lien Loans | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		0
Consumer 1-4 family loans | Residential construction loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due		11,962
Nonaccrual		0
Total Past Due and Nonaccrual		0
Total ending loans balance	$ 9,179	11,962
Consumer 1-4 family loans | Residential construction loans | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		0
Consumer 1-4 family loans | Residential construction loans | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		0
Consumer 1-4 family loans | Other consumer loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Not Past Due		103,240
Nonaccrual		0
Total Past Due and Nonaccrual		145
Total ending loans balance		103,385
Consumer 1-4 family loans | Other consumer loans | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		145
Consumer 1-4 family loans | Other consumer loans | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past Due		$ 0

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