Name:	spfi_AdjustedPeriodForReasonableAndSupportableEconomicForecastOverPercentage
Namespace Prefix:	spfi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

No definition available.

Name:	spfi_AllowanceForCreditLossesOnOffBalanceSheetCreditExposuresAbstract
Namespace Prefix:	spfi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Income from servicing real estate mortgages, credit cards, and other financial assets held by others net of any related impairment of capitalized service costs. Also includes any premiums received in lieu of regular servicing fees on such loans only as earned over the life of the loans.

No definition available.

Name:	spfi_FeesAndCommissionsServicing
Namespace Prefix:	spfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the number of days principal or interest in default for securities to be placed on nonaccrual status, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	spfi_NumberOfDaysPrincipalOrInterestPaymentsAreInDefaultForSecuritiesToBePlacedOnNonaccrualStatus
Namespace Prefix:	spfi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The number of days principal or interest payments are past due for loans to be placed on nonaccrual status, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	spfi_NumberOfDaysPrincipalOrInterestPaymentsArePastDueForLoansToBePlacedOnNonaccrualStatus
Namespace Prefix:	spfi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Period for estimate of expected credit loss for each loan, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	spfi_PeriodForEstimateOfExpectedCreditLossForLoan
Namespace Prefix:	spfi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Period of macroeconomic variables forecast, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	spfi_PeriodOfMacroeconomicVariablesForecast
Namespace Prefix:	spfi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the period of rolling average of historical usage used for determining utilization rates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	spfi_PeriodOfRollingAverageOfHistoricalUsageUsedToDetermineUtilizationRates
Namespace Prefix:	spfi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

No definition available.

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

No definition available.

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

No definition available.

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

No definition available.