ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Amortized Cost Basis Of Collateral Dependent Loans (Details) $ in Thousands	Mar. 31, 2021 USD ($)
Financing Receivable, Allowance for Credit Losses
Real estate	$ 6,438
General Business Assets	11,761
Other	19,589
Commercial and industrial loans | Working capital lines of credit loans
Financing Receivable, Allowance for Credit Losses
Real estate	0
General Business Assets	427
Other	427
Commercial and industrial loans | Non-working capital loans
Financing Receivable, Allowance for Credit Losses
Real estate	1,952
General Business Assets	9,507
Other	11,688
Commercial real estate and multi-family residential loans | Owner occupied loans
Financing Receivable, Allowance for Credit Losses
Real estate	2,707
General Business Assets	1,682
Other	5,550
Agri-business and agricultural loans | Loans Secured By Farmland
Financing Receivable, Allowance for Credit Losses
Real estate	283
General Business Assets	145
Other	428
Consumer 1-4 family loans | Closed end first mortgage loans
Financing Receivable, Allowance for Credit Losses
Real estate	1,496
General Business Assets	0
Other	$ 1,496