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ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY - Additional Information (Details) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) borrower loan | Jun. 30, 2020 USD ($) loan | Jun. 30, 2019 loan | Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($)
Troubled Debt Restructuring |  |  |  |  |
Loans Modified In Troubled Debt Restructured Loans | $ 2,400,000 | $ 2,400,000 |  |  |
Increase (decrease) in allowance for loan loss |  | 2,300,000 |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | 0 |  |  |  |
Loan amount of credit quality analysis |  | 250,000 |  |  |
Financing receivable, loan portfolio, deferrals, COVID-19 | $ 652,500,000 |  |  |  |
Financing receivable, loan portfolio, deferrals, COVID-19, borrowers | borrower | 384 |  |  |  |
Financing receivable, loan portfolio, deferrals, COVID-19, percentage of loan portfolio (as a percent) | 15.00% |  |  |  |
Charge-offs recorded for new troubled debt restructurings |  | 666,000 |  |  |
Loans | $ 4,490,532,000 | 4,490,532,000 |  | $ 4,065,828,000 |
Pass |  |  |  |  |
Troubled Debt Restructuring |  |  |  |  |
Loans | 3,898,239,000 | 3,898,239,000 |  | 3,490,863,000 |
All Modifications [Member] |  |  |  |  |
Troubled Debt Restructuring |  |  |  |  |
Loans Modified In Troubled Debt Restructured Loans | $ 4,800,000 | $ 4,800,000 |  | 2,500,000 |
Number of Loans | loan | 3 | 4 | 1 |  |
Commercial and Industrial Loans [Member] |  |  |  |  |
Troubled Debt Restructuring |  |  |  |  |
Loans | $ 1,793,799,000 | $ 1,793,799,000 |  | 1,426,826,000 |
Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member] |  |  |  |  |
Troubled Debt Restructuring |  |  |  |  |
Loans | 1,225,110,000 | 1,225,110,000 |  | 716,843,000 |
Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member] | Pass |  |  |  |  |
Troubled Debt Restructuring |  |  |  |  |
Loans | 1,176,307,000 | 1,176,307,000 |  | 673,370,000 |
Commercial Real Estate and Multi-family Residential Loans [Member] |  |  |  |  |
Troubled Debt Restructuring |  |  |  |  |
Loans | 1,778,941,000 | 1,778,941,000 |  | 1,670,840,000 |
Agri-business and Agricultural Loans [Member] |  |  |  |  |
Troubled Debt Restructuring |  |  |  |  |
Loans | 352,071,000 | 352,071,000 |  | 379,631,000 |
Consumer 14 family mortgage loans |  |  |  |  |
Troubled Debt Restructuring |  |  |  |  |
Loans | 356,578,000 | 356,578,000 |  | $ 377,999,000 |
Commercial Real Estate Building |  |  |  |  |
Troubled Debt Restructuring |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment |  |  |  |  | $ 533,000
Commercial and Industrial Nonworking Capital |  |  |  |  |
Troubled Debt Restructuring |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment |  |  |  |  | $ 70,000
Commercial Loan |  |  |  |  |
Troubled Debt Restructuring |  |  |  |  |
Financing receivable, loan portfolio, deferrals, COVID-19 | $ 647,000,000.0 |  |  |  |
Financing receivable, loan portfolio, deferrals, COVID-19, borrowers | borrower | 322 |  |  |  |
Financing receivable, loan portfolio, deferrals, COVID-19, percentage of loan portfolio (as a percent) | 16.00% |  |  |  |
Consumer Loan |  |  |  |  |
Troubled Debt Restructuring |  |  |  |  |
Financing receivable, loan portfolio, deferrals, COVID-19 | $ 5,500,000 |  |  |  |
Financing receivable, loan portfolio, deferrals, COVID-19, borrowers | borrower | 62 |  |  |  |
Financing receivable, loan portfolio, deferrals, COVID-19, percentage of loan portfolio (as a percent) | 1.00% |  |  |  |
PPP | Pass |  |  |  |  |
Troubled Debt Restructuring |  |  |  |  |
Loans | $ 554,600,000 | $ 554,600,000 |  |  |

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