XML 31 R35.htm IDEA: XBRL DOCUMENT v3.20.1

Available for Sale Securities (Details) - Summary of amortized cost and fair values with gross unrealized gains and losses of available-for-sale securities - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Available for Sale Securities (Details) - Summary of amortized cost and fair values with gross unrealized gains and losses of available-for-sale securities [Line Items]
Amortized Cost	$ 105,134	$ 100,114
Gross Unrealized Gains	2,605	1,039
Gross Unrealized Losses	(12)	(205)
Fair Value	107,727	100,948
US Treasury and Government [Member]
Available for Sale Securities (Details) - Summary of amortized cost and fair values with gross unrealized gains and losses of available-for-sale securities [Line Items]
Amortized Cost	21,846	12,023
Gross Unrealized Gains	298	181
Gross Unrealized Losses		(2)
Fair Value	22,144	12,202
Collateralized Mortgage Backed Securities [Member]
Available for Sale Securities (Details) - Summary of amortized cost and fair values with gross unrealized gains and losses of available-for-sale securities [Line Items]
Amortized Cost	73,318	77,892
Gross Unrealized Gains	1,858	492
Gross Unrealized Losses	(12)	(202)
Fair Value	75,164	78,182
US States and Political Subdivisions Debt Securities [Member]
Available for Sale Securities (Details) - Summary of amortized cost and fair values with gross unrealized gains and losses of available-for-sale securities [Line Items]
Amortized Cost	9,970	10,199
Gross Unrealized Gains	449	366
Gross Unrealized Losses		(1)
Fair Value	$ 10,419	$ 10,564

X

- References

No definition available.

+ Details

Name:	sbfg_AvailableforSaleSecuritiesDetailsSummaryofamortizedcostandfairvalueswithgrossunrealizedgainsandlossesofavailableforsalesecuritiesLineItems
Namespace Prefix:	sbfg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

No definition available.

+ Details

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

X

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USTreasuryAndGovernmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_MortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: