The amount of subscription to exchange their securities by debt holders.

No definition available.

Name:	spfi_DebtInstrumentHoldersElectingToToExchangeSecurities
Namespace Prefix:	spfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The debt instrument issued in exchange of previously issued notes.

+ References

No definition available.

+ Details

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

- Definition

The period after issue date when debt instruments may be redeemed, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Term of fixed interest rate, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

- Definition

The maximum interest rate, specified per the agreement, that will be accepted as the variable interest rate for the debt instrument.

+ References

No definition available.

+ Details

Name:	spfi_DebtInstrumentVariableInterestRateCeiling
Namespace Prefix:	spfi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The minimum interest rate, specified per the agreement, that will be accepted as the variable interest rate for the debt instrument.

+ References

No definition available.

+ Details

Name:	spfi_DebtInstrumentVariableInterestRateFloor
Namespace Prefix:	spfi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The remaining maturity period during which debt can be called, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow from the repayment of long-term borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in case of liquidation of the entity's assets or underlying collateral.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

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

- Details

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Namespace Prefix:
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Balance Type:
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- Details

Name:	us-gaap_FinancialInstrumentAxis=spfi_DebtSecuritiesOneMember
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Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
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- Details

Name:	us-gaap_FinancialInstrumentAxis=spfi_DebtSecuritiesTwoMember
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- Details

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BORROWING ARRANGEMENTS, Subordinated Debt Securities (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Jan. 31, 2014
Subordinated Debt Securities [Abstract]
Outstanding balance	$ 34,002	$ 26,472
Subordinated Debt Securities Issued in January 2014 [Member]
Subordinated Debt Securities [Abstract]
Debt instrument, face amount			$ 20,900
Debt instrument, maturity date		Jan. 31, 2024
Amount of debt securities whose holders elected to exchange their securities	13,400
Amount of debt securities redeemed	7,500
Outstanding balance	7,500
Subordinated Debt Securities Issued in January 2014 [Member] \| Debt Securities One [Member]
Subordinated Debt Securities [Abstract]
Debt instrument, face amount			$ 14,400
Debt instrument, initial interest rate			5.00%
Debt instrument, period of fixed interest rate		5 years
Debt instrument, variable interest rate, floor		4.00%
Debt instrument, variable interest rate, ceiling		7.50%
Subordinated Debt Securities Issued in January 2014 [Member] \| Debt Securities One [Member] \| Maximum [Member]
Subordinated Debt Securities [Abstract]
Period after issue date when debt securities may be redeemed		5 years
Subordinated Debt Securities Issued in January 2014 [Member] \| Debt Securities Two [Member]
Subordinated Debt Securities [Abstract]
Debt instrument, face amount			$ 6,500
Debt instrument, initial interest rate			4.00%
Debt instrument, period of fixed interest rate		5 years
Debt instrument, variable interest rate, floor		4.00%
Debt instrument, variable interest rate, ceiling		7.50%
Subordinated Debt Securities Issued in January 2014 [Member] \| Debt Securities Two [Member] \| Maximum [Member]
Subordinated Debt Securities [Abstract]
Period after issue date when debt securities may be redeemed		5 years
Subordinated Debt Securities Issued in December 2018 [Member]
Subordinated Debt Securities [Abstract]
Debt instrument, face amount	26,500
Debt Instrument issued in exchange of previously issued notes	13,400
Subordinated Debt Securities Issued in December 2018 [Member] \| Debt Securities One [Member]
Subordinated Debt Securities [Abstract]
Debt instrument, face amount	$ 12,400
Debt instrument, maturity date		Dec. 31, 2028
Debt instrument, initial interest rate	5.74%
Debt instrument, period of fixed interest rate		5 years
Debt instrument, variable interest rate, floor		4.50%
Debt instrument, variable interest rate, ceiling		7.50%
Subordinated Debt Securities Issued in December 2018 [Member] \| Debt Securities One [Member] \| Maximum [Member]
Subordinated Debt Securities [Abstract]
Remaining maturity period during which debt can be called		5 years
Subordinated Debt Securities Issued in December 2018 [Member] \| Debt Securities Two [Member]
Subordinated Debt Securities [Abstract]
Debt instrument, face amount	$ 14,100
Debt instrument, maturity date		Dec. 31, 2030
Debt instrument, initial interest rate	6.41%
Debt instrument, period of fixed interest rate		7 years
Debt instrument, variable interest rate, floor		4.50%
Debt instrument, variable interest rate, ceiling		7.50%
Subordinated Debt Securities Issued in December 2018 [Member] \| Debt Securities Two [Member] \| Maximum [Member]
Subordinated Debt Securities [Abstract]
Remaining maturity period during which debt can be called		5 years