XML 45 R34.htm IDEA: XBRL DOCUMENT
v3.26.1

DEPOSITS (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2026
Deposit Liabilities [Abstract] |
Schedule of Maturities of Time Deposits | Scheduled maturities of time deposits as of March 31, 2026 were as follows (in thousands):
2026 | $ | 873,147 |
2027 | 100,607 |
2028 | 10,092 |
2029 | 6,186 |
Thereafter | 12,459 |
Total | $ | 1,002,491 |

X
- Definition Deposit Liabilities [Abstract] + References No definition available. + Details
Name: | stel_DepositLiabilitiesAbstract
Namespace Prefix: | stel_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of time deposits by year of maturity. + References No definition available. + Details
Name: | stel_ScheduleOfMaturitiesOfTimeDepositsTableTableTextBlock
Namespace Prefix: | stel_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration