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Junior Subordinated Deferrable Interest Debentures (Details) | 12 Months Ended
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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 |  |

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- 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
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- Definition 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(9)) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
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