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v3.22.1

Deposits and Borrowings - Time deposits and FHLB advances by contractual maturity (Details) $ in Thousands | Mar. 31, 2022 USD ($)
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Contractual maturity |
2022 | $ 314,673
2023 | 238,509
2024 | 54,741
2025 | 2,111
2026 | 2,387
Thereafter | 18,366
Total | $ 630,787

X
- Definition Amount of time deposit liabilities and Fhlp advances. + References No definition available. + Details
Name: | jmsb_TimeDepositsAndFhlbAdvances
Namespace Prefix: | jmsb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of time deposit and Fhlp advances maturing after fourth fiscal year following current fiscal year. + References No definition available. + Details
Name: | jmsb_TimeDepositsAndFhlbAdvancesAfterYearFour
Namespace Prefix: | jmsb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of time deposit and Fhlp advances maturing in remainder of current fiscal year. + References No definition available. + Details
Name: | jmsb_TimeDepositsAndFhlbAdvancesRemainderOfFiscalYear
Namespace Prefix: | jmsb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of time deposit and Fhlp advances maturing in fourth fiscal year following current fiscal year. + References No definition available. + Details
Name: | jmsb_TimeDepositsAndFhlbAdvancesYearFour
Namespace Prefix: | jmsb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of time deposit and Fhlp advances maturing in next fiscal year following current fiscal year. + References No definition available. + Details
Name: | jmsb_TimeDepositsAndFhlbAdvancesYearOne
Namespace Prefix: | jmsb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of time deposit and Fhlp advances maturing in third fiscal year following current fiscal year + References No definition available. + Details
Name: | jmsb_TimeDepositsAndFhlbAdvancesYearThree
Namespace Prefix: | jmsb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of time deposit and Fhlp advances maturing in second fiscal year following current fiscal year. + References No definition available. + Details
Name: | jmsb_TimeDepositsAndFhlbAdvancesYearTwo
Namespace Prefix: | jmsb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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