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REGULATORY MATTERS, COMMITMENTS AND CONTINGENCIES - Additional Information (Detail) - USD ($) $ in Thousands | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Jan. 01, 2020
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |  |  |  |  |  |
Percentage Of Increase In ACL Adjusted In Capital Measures |  |  |  |  |  |  | 25.00%
CECL, amount excluded to be phased-on during after two years | $ 48,600 |  |  |  |  |  |
Stockholders Equity | 1,265,333 |  | $ 2,101,767 | $ 2,197,965 |  |  |
Commercial And Financial Standby Letters Of Credit [Member] |  |  |  |  |  |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |  |  |  |  |  |
Commitments to extend credit | 94,000 |  |  |  |  |  |
Commitments To Extend Credit [Member] |  |  |  |  |  |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |  |  |  |  |  |
Commitments to extend credit | 1,900,000 |  |  |  |  |  |
Commitments To Extend Credit [Member] | Credit Card [Member] |  |  |  |  |  |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |  |  |  |  |  |
Commitments to extend credit | 1,000,000 |  |  |  |  |  |
Retained Earnings [Member] |  |  |  |  |  |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |  |  |  |  |  |
Stockholders Equity | 1,593,284 | $ 1,541,334 | $ 1,427,295 | $ 1,375,797 | $ 1,315,352 | $ 1,215,321 |
ASU 2016-13 | Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member] |  |  |  |  |  |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |  |  |  |  |  |
Stockholders Equity | $ 16,200 |  |  |  |  |  |
Basel III [Member] |  |  |  |  |  |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |  |  |  |  |  |
Capital Conservation Buffer | 2.50% |  |  |  |  |  |

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