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REGULATORY MATTERS, COMMITMENTS AND CONTINGENCIES - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Jan. 01, 2020
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |  |
One-time charge associated with FDIC implementation of special assessment |  | $ 6.3 |
Commercial And Financial Standby Letters Of Credit [Member] |  |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |  |
Commitments to extend credit | $ 74.0 |  |
Commitments To Extend Credit [Member] |  |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |  |
Commitments to extend credit | 2,000.0 |  |
Commitments To Extend Credit [Member] | Credit Card [Member] |  |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |  |
Commitments to extend credit | $ 0.9 |  |
ASU 2016-13 |  |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |  |
Percentage Of Increase In ACL Adjusted In Capital Measures | 25.00% |  | 25.00%
CECL, amount excluded to be phased-on during after two years | $ 16.2 |  |
ASU 2016-13 | Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member] |  |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |  |
Cumulative Effect Of New Accounting Principle In Period Of Adoption 1 |  |  | $ (48.6)
Basel III [Member] |  |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |  |
Capital Conservation Buffer | 2.50% |  |

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