Significant Accounting Policies (Policies)	3 Months Ended
Significant Accounting Policies (Policies)	Mar. 31, 2019
Accounting Policies [Abstract]
Comprehensive Income, Policy [Policy Text Block]	Comprehensive Incom e . GAAP generally requires that recognized revenue, expenses, gains and losses be included in earnings. Although certain changes in assets and liabilities, such as unrealized gains and losses on available-for-sale securities, are reported as a separate component of the equity section of the condensed consolidated balance sheet, such items along with net earnings, are components of comprehensive income. The only component of other comprehensive income (loss) is the net change in the unrealized gain on securities available for sale.
Share-based Payment Arrangement, Director [Policy Text Block]	S tock - Based Compensation. The Company expenses the fair value of stock options and restricted stock granted. The Company recognizes stock-based compensation expense in the condensed consolidated statements of earnings over the vesting period.
Mortgage Banking Activity [Policy Text Block]	Mortgage Banking Revenue. Mortgage banking revenue includes gains and losses on the sale of mortgage loans originated for sale and wholesale brokerage fees, net of commissions and deferred loan costs. The Company recognizes mortgage banking revenue from mortgage loans originated in the condensed consolidated statements of earnings upon sale of the loans.
Reclassification, Policy [Policy Text Block]	Reclassifications. Certain reclassifications of prior period amounts have been made to conform to the current period presentation.
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Standards Update. In January 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016 - 01, Financial Instruments-Overall (Subtopic 825 - 10 ): Recognition and Measurement of Financial Assets and Financial Liabilities, which is intended to enhance the reporting model for financial instruments to provide users of financial statements with more decision-useful information. The ASU requires equity investments to be measured at fair value with changes in fair values recognized in net earnings, (public entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes), simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment and eliminates the requirement to disclose fair values, the methods and significant assumptions used to estimate the fair value of financial instruments measured at amortized cost. The ASU also clarifies that the Company should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale debt securities in combination with the Company's other deferred tax assets. For public business entities, the ASU is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The adoption of this guidance did not have a material impact on the Company's condensed consolidated financial statements. In February 2016, the FASB issued ASU No. 2016 - 2, Leases (Topic 842 ) which will require lessees to recognize on the balance sheet the assets and liabilities for the rights and obligations created by those leases with terms of more than twelve months. Consistent with current GAAP, the recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification as a finance or operating lease. The new ASU will require both types of leases to be recognized on the balance sheet. The ASU also will require disclosures to help investors and other financial statement users better understand the amount, timing, and uncertainty of cash flows arising from leases. These disclosures include qualitative and quantitative requirements, providing additional information about the amounts recorded in the financial statements. For public companies, the ASU is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The effect of this ASU increased its assets and liabilities by approximately $288,000 at January 1, 2019. In June 2016, the FASB issued ASU No. 2016 - 13, Financial Instruments-Credit Losses (Topic 326 ) . The ASU improves financial reporting by requiring timelier recording of credit losses on loans and other financial instruments held by the Company. The ASU requires the Company to measure all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Many of the loss estimation techniques applied today will still be permitted, although the inputs to those techniques will change to reflect the full amount of expected credit losses. The Company will continue to use judgment to determine which loss estimation method is appropriate for its circumstances. The ASU requires enhanced disclosures to help investors and other financial statement users better understand significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards of an organization's portfolio. These disclosures include qualitative and quantitative requirements that provide additional information about the amounts recorded in the financial statements. Additionally, the ASU amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. Recent Accounting Standards Update , Continued. The new guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted. The Company is in the process of determining the effect of the ASU on its condensed consolidated financial statements. In March 2017, the FASB issued ASU No. 2018 - 08, “Premium Amortization on Purchased Callable Debt Securities”, to amend the amortization period for certain purchased callable debt securities held at a premium. Under current GAAP, entities generally amortize the premium as an adjustment of yield over the contractual life of the instrument. The amendments in this update require the premium to be amortized to the earliest call date. No accounting change is required for securities held at a discount. For public business entities, the amendments in this update become effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2018. Early adoption is permitted, including adoption in an interim period. If an entity early adopts the amendments in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. An entity should apply the amendments in this update on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. The Company has adhered to this practice since its inception. In June 2018, the FASB issued ASU No. 2018 - 07, Stock Compensation (Topic 718 ): Improvements to Nonemployee Share-Based Payment Accounting. The ASU is intended to reduce the cost and complexity and to improve financial reporting for nonemployee share-based payments. The ASU expands the scope of Topic 718. Compensation Stock Compensation (which currently only includes share-based payments to employees) to include share-based payments issued to nonemployees for goods or services. Consequently, the accounting for share-based payments to nonemployees and employees will be substantially aligned. The ASU supersedes Subtopic 505 - 50, Equity-Equity-Based payments to Non-Employees. The ASU is effective for the Company for fiscal years beginning after December 15, 2018, including interim periods within that fiscal year. Early adoption is permitted, but no earlier than a company’s adoption date of Topic 606, Revenue from Contracts with Customers. The ASU had no impact on the Company’s condensed consolidated financial statements.