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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
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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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