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v3.25.4

DERIVATIVE INSTRUMENTS - Narrative (Details) | 12 Months Ended
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Dec. 31, 2025 interest_rate_swap creditAgreement | Dec. 31, 2024 creditAgreement interest_rate_swap
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Number of interest rate swap agreements outstanding | interest_rate_swap | 10 | 9
Number of credit risk participation agreements | creditAgreement | 3 | 3

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- Definition Number Of Credit Risk Participation Agreements + References No definition available. + Details
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- Definition Number of Interest Rate Swap Agreements Outstanding + References No definition available. + Details
Name: | stel_NumberOfInterestRateSwapAgreementsOutstanding
Namespace Prefix: | stel_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration