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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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