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LOANS AND ALLOWANCE - Narrative (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 01, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Jan. 01, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans held for sale |  | $ 30,972,000 |  | $ 30,972,000 |  |  | $ 9,094,000 |  |  |
Loans |  | 12,271,422,000 |  | 12,271,422,000 |  |  | 12,003,894,000 |  |  |
Interest income recognized on non-accrual loans |  | 0 | $ 0 | 0 | $ 0 |  |  |  |  |
Allowance for credit losses increase (decrease) |  | (15,400,000) | 427,000,000,000 | (17,500,000) | 31,300,000 |  |  |  |  |
Loans charged off |  | 20,911,000 | 888,000 | 24,330,000 | 2,785,000 |  |  |  |  |
Provision for credit losses |  | $ 5,000,000 | 0 | $ 5,000,000 | 0 |  |  |  |  |
CECL Day 1 PCD ACL |  |  |  |  | 16,599,000 |  |  |  |  |
CECL Day 1 non-PCD provision for credit losses |  |  |  |  | 13,955,000 |  |  |  |  |
Standby letters of credit usual term |  | 2 years |  | 2 years |  |  |  |  |  |
Off-balance sheet commitments |  | $ 20,300,000 | 23,300,000 | $ 20,300,000 | 23,300,000 | $ 23,300,000 | 23,300,000 | $ 23,300,000 | $ 20,500,000 |
Increase (decrease) in provision |  | (3,000,000) | $ 0 | (3,000,000) | 0 |  |  |  |  |
Adoption of the CECL |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Off-balance sheet commitments |  |  |  |  |  |  |  |  |  | $ 20,500,000
Level One |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
CECL Day 1 PCD ACL |  |  |  |  | 16,600,000 |  |  |  |  |
CECL Day 1 non-PCD provision for credit losses |  |  |  |  | $ 14,000,000 |  |  |  |  |
Increase (decrease) in provision | $ 2,800,000 |  |  |  |  |  |  |  |  |
Commercial and industrial loan one |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans charged off |  | 13,700,000 |  |  |  |  |  |  |  |
Commercial and industrial loan two |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans charged off |  | 5,400,000 |  |  |  |  |  |  |  |
Commercial and industrial loans |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans |  | 3,490,953,000 |  | 3,490,953,000 |  |  | 3,437,126,000 |  |  |
Commercial real estate, owner occupied |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans |  | 1,153,707,000 |  | 1,153,707,000 |  |  | 1,246,528,000 |  |  |
Commercial real estate, non-owner occupied |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans |  | 2,360,596,000 |  | 2,360,596,000 |  |  | 2,407,475,000 |  |  |
Residential |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans |  | 2,257,385,000 |  | 2,257,385,000 |  |  | 2,096,655,000 |  |  |
Past Due |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans |  | 76,300,000 |  | 76,300,000 |  |  | 51,000,000 |  |  |
Increase in past due loans |  |  |  | 25,300,000 |  |  |  |  |  |
30-59 Days Past Due |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans |  | 25,844,000 |  | 25,844,000 |  |  | 29,051,000 |  |  |
Increase in past due loans |  |  |  | 3,200,000 |  |  |  |  |  |
30-59 Days Past Due | Commercial and industrial loans |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans |  | 4,005,000 |  | 4,005,000 |  |  | 4,904,000 |  |  |
30-59 Days Past Due | Commercial real estate, owner occupied |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans |  | 2,368,000 |  | 2,368,000 |  |  | 4,495,000 |  |  |
30-59 Days Past Due | Commercial real estate, non-owner occupied |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans |  | 4,603,000 |  | 4,603,000 |  |  | 5,946,000 |  |  |
30-59 Days Past Due | Residential |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans |  | 10,884,000 |  | 10,884,000 |  |  | 8,607,000 |  |  |
60-89 Days Past Due |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans |  | 18,661,000 |  | 18,661,000 |  |  | 5,935,000 |  |  |
Increase in past due loans |  |  |  | 12,700,000 |  |  |  |  |  |
60-89 Days Past Due | Commercial and industrial loans |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans |  | 3,224,000 |  | 3,224,000 |  |  | 434,000 |  |  |
Increase in past due loans |  |  |  | 2,800,000 |  |  |  |  |  |
60-89 Days Past Due | Commercial real estate, owner occupied |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans |  | 1,225,000 |  | 1,225,000 |  |  | 0 |  |  |
Increase in past due loans |  |  |  | 1,200,000 |  |  |  |  |  |
60-89 Days Past Due | Commercial real estate, non-owner occupied |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans |  | 1,913,000 |  | 1,913,000 |  |  | 881,000 |  |  |
60-89 Days Past Due | Residential |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans |  | 10,405,000 |  | 10,405,000 |  |  | 2,278,000 |  |  |
Increase in past due loans |  |  |  | 8,100,000 |  |  |  |  |  |
90 Days or More Past Due |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans |  | 31,778,000 |  | 31,778,000 |  |  | 16,021,000 |  |  |
Increase in past due loans |  |  |  | 15,800,000 |  |  |  |  |  |
90 Days or More Past Due | Commercial and industrial loans |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans |  | 9,356,000 |  | 9,356,000 |  |  | 2,474,000 |  |  |
Increase in past due loans |  |  |  | 6,900,000 |  |  |  |  |  |
90 Days or More Past Due | Commercial real estate, owner occupied |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans |  | 85,000 |  | 85,000 |  |  | 319,000 |  |  |
90 Days or More Past Due | Commercial real estate, non-owner occupied |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans |  | 11,078,000 |  | 11,078,000 |  |  | 5,153,000 |  |  |
Increase in past due loans |  |  |  | 5,900,000 |  |  |  |  |  |
90 Days or More Past Due | Residential |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Loans |  | $ 8,912,000 |  | 8,912,000 |  |  | $ 5,811,000 |  |  |
Increase in past due loans |  |  |  | $ 3,100,000 |  |  |  |  |  |

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