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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Additional Information (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Allowance for credit losses | $ 67,300,000 |  |  |
Troubled Debt Restructurings Internal Grading System |  | $ 3,300,000 |  | $ 1,600,000
Financing Receivables, Troubled Debt Restructuring |  | 4,000,000 |  | 3,300,000
Impaired Loans For Specific Valuation Allowances |  |  |  | 713,000
Impaired Loans |  |  |  | 4,800,000
Non-accrual loans for no related allowance amortized cost |  | 3,500,000 |  |
TDR loans evaluated on individual | 100,000 |  |  |
After-tax effect decreased retained earnings | 14,200,000 |  |  |
Troubled Debt Restructurings Returned to Accrual Status |  | 27,000 | $ 0 |
Loans and Leases Receivable, Allowance |  | 67,702,000 |  | 55,743,000
Provision for Loan and Lease Losses |  | 300,000 | 3,871,000 |
Aggregate Principal balance outstanding 19 modified comercial loans |  | 141,000,000 |  |
Aggregate Principal balance outstanding 92 modified comercial loans |  | 5,000,000 |  |
Aggregate Principal balance outstanding 65 modified comercial loans |  |  |  | 233,000,000
Aggregate Principal balance outstanding 581 modified comercial loans |  |  |  | 18,000,000
FDIC-assisted acquired loans class categories |  | 91,900,000 |  |
FDIC-acquired loans and remaining accretable yield |  | 1,300,000 |  |
FDIC-assisted acquired loans not loan class categories |  | 98,600,000 |  |
Minimum loan balance with addition to TDR status for classification of loans into Collateral-dependent loans |  | 100,000 |  |
Hotel [Member] |  |  |  |
Total modified loans by collateral |  | 69,000,000 |  |
Multifamily [Member] |  |  |  |
Total modified loans by collateral |  | 11,000,000 |  |
Retail Site [Member] |  |  |  |
Total modified loans by collateral |  | 22,000,000 |  |
Health Care [Member] |  |  |  |
Total modified loans by collateral |  | 28,000,000 |  |
Allowance for unfunded commitment |  |  |  |
Allowance for credit losses | 8,700,000 |  |  |
PCI [Member] |  |  |  |
Allowance for credit losses | 1,900,000 |  |  |
Adopted ASC 326 [Member] |  |  |  |
Loans and Leases Receivable, Allowance | 11,600,000 |  |  |
Loans acquired and accounted |  | 91,900,000 |  |
Adopted ASC 310-30 [Member] |  |  |  |
Non-accruing loans acquired |  | 3,600,000 |  | 3,800,000
FDIC-acquired Loans Accounted |  |  |  | $ 1,700,000
CECL Methodology [Member] |  |  |  |
Allowance for credit losses | 11,600,000 |  | $ 3,900,000 |
Allowance for credit loss remaining discount on loan | 1,900,000 |  |  |
Provision for Loan and Lease Losses |  | 300,000 |  |
CECL Methodology [Member] | Allowance for unfunded commitment |  |  |  |
Allowance for credit losses | $ 8,700,000 |  |  |
Benefit for unfunded loan commitments |  | $ 674,000 |  |

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