LOANS AND THE ALLOWANCE FOR LOAN LOSSES -Loan Modifications (Details) - COVID-19 $ in Millions	3 Months Ended
Mar. 31, 2022 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent over period	30 days
Payments Period	2 years
Number of Loans Modified \| loan	69
Outstanding Balance of Modified Loans \| $	$ 109.8
Loans modified for temporary payment	180 days
Number of loans modified \| loan	18
Loan deferral amount \| $	$ 8.3

Amount of financing receivable modified not treated as troubled debt restructuring.

No definition available.

Name:	myfw_FinancingReceivableLoanModificationNotTreatedAsTroubledDebtRestructuring
Namespace Prefix:	myfw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of financing receivable modified not treated as troubled debt restructuring and are still in deferral period.

+ References

No definition available.

+ Details

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

- Definition

Number of financing receivables that have been modified and not treated as troubled debt restructuring.

+ References

No definition available.

+ Details

Name:	myfw_FinancingReceivableModificationNumberOfContracts
Namespace Prefix:	myfw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of financing receivables that have been modified and not treated as troubled debt restructuring and are still in deferral period.

+ References

No definition available.

+ Details

Name:	myfw_FinancingReceivableModificationNumberOfContractsInDeferral
Namespace Prefix:	myfw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The period of track record will be taken as base for modification of loans.

+ References

No definition available.

+ Details

Name:	myfw_LoanModificationPastCreditRiskAnalysisPeriodBase
Namespace Prefix:	myfw_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum payment delinquent period was taken as base for loan modification.

+ References

No definition available.

+ Details

Name:	myfw_LoanModificationThresholdPeriodPaymentDelinquent
Namespace Prefix:	myfw_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of loans modified for temporary payment.

+ References

No definition available.

+ Details

Name:	myfw_LoansModifiedForTemporaryPaymentPeriod
Namespace Prefix:	myfw_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=myfw_Covid19Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: