FAIR VALUE - Summary of information about the fair value carrying amount and unpaid principal outstanding of loans (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Total Loans
Fair Value Carrying Amount	$ 29,250	$ 32,989
Unpaid Principal Balance	28,863	33,318
Difference	387	(329)
Non Accruals
Fair Value Carrying Amount	10	298
Unpaid Principal Balance	10	646
Difference	0	(348)
90 Days or More Past Due
Fair Value Carrying Amount	10	298
Unpaid Principal Balance	10	646
Difference	0	(348)
Mortgage loans held for sale
Total Loans
Fair Value Carrying Amount	24,151	25,455
Unpaid Principal Balance	23,629	25,217
Difference	522	238
Non Accruals
Fair Value Carrying Amount	0	0
Unpaid Principal Balance	0	0
Difference	0	0
90 Days or More Past Due
Fair Value Carrying Amount	0	0
Unpaid Principal Balance	0	0
Difference	0	0
Loans held for sale
Total Loans
Fair Value Carrying Amount		251
Unpaid Principal Balance		594
Difference		(343)
Non Accruals
Fair Value Carrying Amount		251
Unpaid Principal Balance		594
Difference		(343)
90 Days or More Past Due
Fair Value Carrying Amount		251
Unpaid Principal Balance		594
Difference		(343)
Loans held for investment
Total Loans
Fair Value Carrying Amount	5,099	7,283
Unpaid Principal Balance	5,234	7,507
Difference	(135)	(224)
Non Accruals
Fair Value Carrying Amount	10	47
Unpaid Principal Balance	10	52
Difference	0	(5)
90 Days or More Past Due
Fair Value Carrying Amount	10	47
Unpaid Principal Balance	10	52
Difference	$ 0	$ (5)

Fair Value Of Loans

No definition available.

Name:	myfw_FairValueOfLoansAbstract
Namespace Prefix:	myfw_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The aggregate fair value of loans held as assets for which the fair value option has been elected.

+ References

No definition available.

+ Details

Name:	myfw_FairValueOptionLoansHeldAsAssets
Namespace Prefix:	myfw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair Value, Option, Loans Held as Assets, 90 Days Or More Past Due

+ References

No definition available.

+ Details

Name:	myfw_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDueAbstract
Namespace Prefix:	myfw_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair Value, Option, Loans Held as Assets, Non-Accruals

+ References

No definition available.

+ Details

Name:	myfw_FairValueOptionLoansHeldAsAssetsNonAccruals
Namespace Prefix:	myfw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of principal balance outstanding under loans and lease receivable.

+ References

No definition available.

+ Details

Name:	myfw_FairValueOptionLoansHeldAsAssetsUnpaidPrincipalBalance
Namespace Prefix:	myfw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of principal balance outstanding that are 90 days or more past due under loans and lease receivable.

+ References

No definition available.

+ Details

Name:	myfw_FairValueOptionLoansHeldAsAssetsUnpaidPrincipalBalance90DaysOrMorePastDue
Namespace Prefix:	myfw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of principal balance outstanding that are in non accrual status under loans and lease receivable.

+ References

No definition available.

+ Details

Name:	myfw_FairValueOptionLoansHeldAsAssetsUnpaidPrincipalBalanceNonaccrualStatus
Namespace Prefix:	myfw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This item represents the aggregate fair value of loans held as assets that are 90 days or more past due for which the fair value option has been elected.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (e)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

+ Details

Name:	us-gaap_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

For loans held as assets for which the fair value option has been elected, this item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of those loans that are 90 days or more past due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (e)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

+ Details

Name:	us-gaap_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDueAggregateDifference
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_FairValueOptionLoansHeldAsAssetsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

+ References

+ Details

Name:	us-gaap_FairValueOptionLoansHeldAsAssetsAggregateAmountInNonaccrualStatusAggregatedDifference
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

+ References

+ Details

Name:	us-gaap_FairValueOptionLoansHeldAsAssetsAggregateDifference
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=myfw_MortgageLoansHeldForSaleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=myfw_LoansHeldForSaleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=myfw_LoansHeldForInvestmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: