Carrying Amounts and Fair Value of Financial Instruments (Fair value measurements, nonrecurring basis) (Details) - USD ($)		Mar. 31, 2019		Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Real Estate, Foreclosed Assets, and Repossessed Assets		$ 809,341		$ 722,442
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		8,095,688		11,117,997
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		0		0
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		2,436,445		1,781,985
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		5,659,243		9,336,012
Mortgage Loans Held For Sale | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		2,436,445		1,781,985
Mortgage Loans Held For Sale | Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		0		0
Mortgage Loans Held For Sale | Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		2,436,445		1,781,985
Mortgage Loans Held For Sale | Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		0		0
Collateral Dependent Impaired Loans (1) | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	[1]			8,613,570
Impaired financing receivable, related allowance		637,314		738,662
Collateral Dependent Impaired Loans (1) | Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		0	[2]	0	[1]
Collateral Dependent Impaired Loans (1) | Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		0	[2]	0	[1]
Collateral Dependent Impaired Loans (1) | Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		4,849,902	[2]	8,613,570	[1]
Foreclosed Assets | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		809,341		722,442
Foreclosed Assets | Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		0		0
Foreclosed Assets | Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		$ 0		0
Foreclosed Assets | Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value				$ 722,442

[1] IMPAIRED LOANS ARE REPORTED NET OF SPECIFIC RESERVES OF $637,000 AND $739,000 AT MARCH 31, 2019 AND DECEMBER 31, 2018, RESPECTIVELY.

[2] 10. Carrying Amounts and Fair Value of Financial InstrumentsGAAP requires the Company to disclose fair value of financial instruments measured at amortized cost on the balance sheet and to measure that fair value using an exit price notion, the price that would be received for an asset or paid to transfer a liability, in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date under current market conditions. Accounting guidance emphasizes that fair value is a market-based measurement, not an entity-specific measurement. Therefore, a fair value measurement should be determined based on the assumptions that market participants would use in pricing the asset or liability. As a basis for considering market participant assumptions in fair value measurements, the guidance establishes a fair value hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity (observable inputs that are classified within Levels 1 and 2 of the hierarchy) and the reporting entity’s own assumptions about market participant assumptions (unobservable inputs classified within Level 3 of the hierarchy).Level 1 - Quoted Market Price in Active MarketsValuation is based upon quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access. Level 1 assets and liabilities include debt and equity securities and derivative contracts that are traded in an active exchange market, as well as U.S. Treasuries and money market funds.Level 2 -Significant Other Observable InputsValuation is based upon quoted prices for similar assets and liabilities in active markets, as well as inputs that are observable for the asset or liability (other than quoted prices), such as interest rates, foreign exchange rates, and yield curves that are observable at commonly quoted intervals. Level 2 assets and liabilities include debt securities with quoted prices that are traded less frequently than exchange-traded instruments, mortgage-backed securities, municipal bonds, corporate debt securities and derivative contracts whose value is determined using a pricing model with inputs that are observable in the market or can be derived principally from or corroborated by observable market data. This category generally includes certain derivative contracts.Level 3 - Significant Unobservable InputsValuation is generated from model-based techniques that use at least one significant assumption based on unobservable inputs for the asset or liability, which are typically based on an entity’s own assumptions, as there is little, if any, related market activity. In instances where the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level input that is significant to the fair value measurement in its entirety. The assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the asset or liability.The following is a description of the valuation methodologies used for assets and liabilities recorded at fair value.Investment Securities Available for SaleInvestment securities available for sale are recorded at fair value on a recurring basis. At March 31, 2019, the Company’s investment portfolio was comprised of student loan pools, government and agency bonds, mortgage-backed securities issued by government agencies or GSEs, private label CMO mortgage-backed securities, municipal securities, and one equity investment. Fair value measurement is based upon prices obtained from third party pricing services that use independent pricing models which rely on a variety of factors including reported trades, broker/dealer quotes, benchmark yields, economic and industry events and other relevant market information. As a result, these securities are classified as Level 2.Mortgage Loans Held for SaleThe Company originates fixed rate residential loans on a servicing released basis in the secondary market. Loans closed but not yet settled with the FHLMC or other investors, are carried in the Company’s loans held for sale portfolio. These loans are fixed rate residential loans that have been originated in the Company’s name and have closed. Virtually all of these loans have commitments to be purchased by investors and the majority of these loans were locked in by price with the investors on the same day or shortly thereafter that the loan was locked in with the Company’s customers. Therefore, these loans present very little market risk for the Company. The Company usually delivers a commitment to, and receives funding from, the investor within 30 days. Commitments to sell these loans to the investor are considered derivative contracts and are sold to investors on a “best efforts" basis. The Company is not obligated to deliver a loan or pay a penalty if a loan is not delivered to the investor. As a result of the short-term nature of these derivative contracts, the fair value of the mortgage loans held for sale in most cases is the same as the value of the loan amount at its origination. These loans are classified as Level 2.10. Carrying Amounts and Fair Value of Financial Instruments, ContinuedImpaired LoansThe Company does not record loans held for investment at fair value on a recurring basis. However, from time to time, a loan is considered impaired and an allowance for loan losses is established as necessary. Loans for which it is probable that payment of interest and principal will not be made in accordance with the contractual terms of the loan agreement are considered impaired. Once a loan is identified as impaired, management measures the impairment by determining the fair value of the collateral for the loan.Fair value is estimated using one of the following methods: fair value of the collateral less estimated costs to sell, discounted cash flows, or market value of the loan based on similar debt. The fair value of the collateral less estimated costs to sell is the most frequently used method. Typically, the Company reviews the most recent appraisal and if it is over 24 months old will request a new third party appraisal. Depending on the particular circumstances surrounding the loan, including the location of the collateral, the date of the most recent appraisal and the value of the collateral relative to the recorded investment in the loan, management may order an independent appraisal immediately or, in some instances, may elect to perform an internal analysis. Specifically as an example, in situations where the collateral on a nonperforming commercial real estate loan is out of the Company’s primary market area, management would typically order an independent appraisal immediately, at the earlier of the date the loan becomes nonperforming or immediately following the determination that the loan is impaired. However, as a second example, on a nonperforming commercial real estate loan where management is familiar with the property and surrounding areas and where the original appraisal value far exceeds the recorded investment in the loan, management may perform an internal analysis whereby the previous appraisal value would be reviewed and adjusted for current conditions including recent sales of similar properties in the area and any other relevant economic trends. These valuations are reviewed at a minimum on a quarterly basis.Those impaired loans not requiring an allowance represent loans for which the fair value of the expected repayments or collateral exceed the recorded investments in such loans. At March 31, 2019, our impaired loans were generally evaluated based on the fair value of the collateral. Impaired loans where an allowance is established based on the fair value of collateral require classification in the fair value hierarchy. The Company records impaired loans as nonrecurring Level 3. At March 31, 2019 and December 31, 2018, the recorded investment in impaired loans was $5.5 million and $9.4 million, respectively. Foreclosed AssetsForeclosed assets are adjusted to fair value upon transfer of the loans to foreclosed assets. Subsequently, foreclosed assets are carried at the lower of carrying value or fair value. Fair value is based upon independent market prices, appraised values of the collateral or management’s estimation of the value of the collateral. Foreclosed assets are recorded as nonrecurring Level 3. Assets measured at fair value on a recurring basis were as follows at March 31, 2019 and December 31, 2018: March 31, 2019 December 31, 2018 Level 1 Level 2 Level 3 Level 1 Level 2 Level 3Student Loan Pools$— $22,911,658 $— $— $12,885,501 $—SBA Bonds— 124,865,995 — — 125,446,531 —Tax Exempt Municipal Bonds— 59,788,776 — — 61,330,369 —Taxable Municipal Bonds— 2,008,585 — — 1,977,885 —Mortgage-Backed Securities— 192,621,678 — — 184,460,551 —Equity Securities— 155,000 — — 155,000 —Total$— $402,351,692 $— $— $386,255,837 $—There were no liabilities measured at fair value on a recurring basis at March 31, 2019 or December 31, 2018. 10. Carrying Amounts and Fair Value of Financial Instruments, ContinuedThe Company may be required, from time to time, to measure certain assets at fair value on a nonrecurring basis. These include assets that are measured at the lower of cost or market that were recognized at fair value below cost at the end of the period. The tables below present assets measured at fair value on a nonrecurring basis at March 31, 2019 and December 31, 2018, aggregated by the level in the fair value hierarchy within which those measurements fall. March 31, 2019Assets:Level 1 Level 2 Level 3 TotalMortgage Loans Held For Sale$— $2,436,445 $— $2,436,445Collateral Dependent Impaired Loans (1)— — 4,849,902 4,849,902Foreclosed Assets— — 809,341 809,341Total$— $2,436,445 $5,659,243 $8,095,688 December 31, 2018Assets:Level 1 Level 2 Level 3 TotalMortgage Loans Held For Sale$— $1,781,985 $— $1,781,985Collateral Dependent Impaired Loans (1)— — 8,613,570 8,613,570Foreclosed Assets— — 722,442 722,442Total$— $1,781,985 $9,336,012 $11,117,997