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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Additional Information (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Allowance for credit losses | $ 67,300,000 |  |  |  |  |
Troubled Debt Restructurings Internal Grading System Substandard |  |  |  | $ 2,900,000 |  | $ 1,600,000
Financing Receivables, Troubled Debt Restructuring |  | $ 3,800,000 |  | 3,800,000 |  | 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 |  |  |  | 2,700,000 |  |
TDR loans evaluated on individual | 100,000 |  |  |  |  |
After-tax effect decreased retained earnings | 14,200,000 |  |  |  |  |
Troubled Debt Restructurings Returned to Accrual Status |  | 96,000 | $ 155,000 | 433,000 | $ 155,000 |
Loans and Leases Receivable, Allowance |  | 63,629,000 |  | 63,629,000 |  | 55,743,000
Provision for Loan and Lease Losses |  | (3,000,000) | 4,500,000 | (3,700,000) | 14,371,000 |
Aggregate Principal balance outstanding 15 modified commercial loans |  |  |  | 38,200,000 |  |
Aggregate Principal balance outstanding 30 modified commercial loans |  |  |  | 1,600,000 |  |
Aggregate Principal balance outstanding 65 modified commercial loans |  |  |  |  |  | 232,400,000
Aggregate Principal balance outstanding 581 modified comercial loans |  |  |  |  |  | 18,200,000
FDIC-assisted acquired loans class categories |  |  |  | 79,500,000 |  |
FDIC-acquired loans and remaining accretable yield |  | 606,000 |  | 606,000 |  |
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 |  | 10,900,000 |  | 10,900,000 |  |
Office Building [Member] |  |  |  |  |  |
Total modified loans by collateral |  | 6,900,000 |  | 6,900,000 |  |
Health Care [Member] |  |  |  |  |  |
Total modified loans by collateral |  | 11,600,000 |  | 11,600,000 |  |
Retail |  |  |  |  |  |
Total modified loans by collateral |  | 7,700,000 |  | 7,700,000 |  |
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 |  |  |  | 79,500,000 |  |
Adopted ASC 310-30 [Member] |  |  |  |  |  |
Non-accruing loans acquired |  |  |  | 1,900,000 |  | 3,800,000
FDIC-acquired Loans Accounted |  |  |  |  |  | $ 1,700,000
Loans acquired and accounted |  |  |  | 79,500,000 |  |
CECL Methodology [Member] |  |  |  |  |  |
Allowance for credit losses | 11,600,000 |  |  |  |  |
Allowance for credit loss remaining discount on loan | 1,900,000 |  |  |  |  |
Provision for Loan and Lease Losses |  | (3,000,000.0) | $ 4,500,000 | (3,700,000) | $ 14,400,000 |
CECL Methodology [Member] | Allowance for unfunded commitment |  |  |  |  |  |
Allowance for credit losses | $ 8,700,000 |  |  |  |  |
Provision for Loan and Lease Losses |  | $ 643,000 |  | $ 338,000 |  |

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