Junior Subordinated Deferrable Interest Debentures (Details)	12 Months Ended
Dec. 31, 2018 USD ($) quarter $ / security	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Percentage of Trust Preferred Securities eligible as Tier 1 capital	25.00%
Spread on LIBOR	1.60%
Redemption period	90 days
Percentage of notes outstanding required to call payment	25.00%
Number of consecutive quarterly periods of nonpayment required to call notes \| quarter	20
Liquidation value per security \| $ / security	1,000
Interest rate at period end	4.04%
Interest expense for the period	$ 199,000	$ 147,000	$ 121,000
Service 1st Bank
Debt Instrument [Line Items]
Aggregate Principal Amount Junior Subordinated Notes	$ 5,155,000

Amount Of Trust Preferred Securities Eligible As Tier One Capital Maximum Percentage

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Long Term Debt Terms Redemption Period

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Number Of Consecutive Quarterly Periods Of Nonpayment Required To Call Notes

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Percentage Of Aggregate Principal Amount Of Notes Outstanding Required To Call Notes

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Trust Preferred Securities Liquidation Value Per Unit

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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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.

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The amount of interest incurred to a trust which has issued trust-preferred securities. In order to issue trust preferred securities, a sponsor forms a trust by investing a nominal amount of cash to purchase all of the voting common stock of the trust. The trust issues nonvoting, mandatorily redeemable preferred securities to outside investors in exchange for cash. The proceeds received from the issuance of the preferred securities, together with the cash received for issuing the common stock to the sponsor, is then loaned to the sponsor in exchange for a note which has the same terms as the trust preferred securities. Trust preferred securities possesses characteristics of both equity and debt issues and are generally issued by bank holding companies.

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