Summary of Significant Accounting Policies (Policies)	12 Months Ended
Summary of Significant Accounting Policies (Policies)	Dec. 31, 2015
Summary of Significant Accounting Policies [Abstract]
Description of Business	Description of Business: Baldwin & Lyons, Inc., (the "Company") based in Carmel, Indiana, is a specialty property-casualty insurer providing liability coverage for large and medium-sized trucking and public transportation fleets as well as coverages for trucking industry independent contractors. Additionally, the Company's product offerings include coverage for small fleet trucking and professional liability as well as workers' compensation for small businesses and casualty reinsurance.
Basis of Presentation	Basis of Presentation: The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All significant inter-company transactions and accounts have been eliminated in consolidation.
Use of Estimate	Use of Estimates: Preparation of the consolidated financial statements requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results will differ from those estimates
Cash and Cash Equivalents	Cash and Cash Equivalents: The Company considers investments in money market funds to be cash equivalents. Carrying amounts for these instruments approximate their fair values.
Investments	Investments: Carrying amounts for fixed maturity securities represent fair value and are based on quoted market prices, where available, or broker/dealer quotes for specific securities where quoted market prices are not available. Equity securities are carried at quoted market prices (fair value). The Company accounts for investments in limited partnerships using the equity method of accounting, which requires an investor in a limited partnership to record its proportionate share of the limited partnership's net income. To the extent that the limited partnership investees include both realized and unrealized investment gains or losses in the determination of net income or loss, then the Company would also recognize, through its statements of operations, its proportionate share of the investee's unrealized as well as realized investment gains or losses. Other investments, if any, are carried at either market value or cost, depending on the nature of the investment. Short-term investments are carried at cost, which approximates their fair values. Realized gains and losses on disposals of investments are determined by specific identification of cost of investments sold and are included in income. All fixed maturity and equity securities are considered to be available for sale; the related unrealized net gains or losses (net of applicable tax effect) are reflected directly in shareholders' equity. Included within available for sale fixed maturity securities are insurance linked securities and convertible debt securities. The changes in fair values of insurance-linked securities and portions of the changes in fair values of convertible debt securities are reflected as a component of net realized gains (losses) on investments. In accordance with the Financial Accounting Standard Board's ("FASB") other-than-temporary impairment ("OTTI") guidance, if a fixed maturity security is in an unrealized loss position and the Company has the intent to sell the fixed maturity security, or it is more likely than not that the Company will have to sell the fixed maturity security before recovery of its amortized cost basis, the decline in value is deemed to be other-than-temporary and is recorded to net realized losses on investments in the consolidated statements of operations. For impaired fixed maturity securities that the Company does not intend to sell or in cases where it is more likely than not that the Company will not have to sell such securities, but the Company expects that it will not fully recover the amortized cost basis, the credit component of the other-than-temporary impairment is recognized in net realized losses on investments in the consolidated statements of operations and the non-credit component of the other-than-temporary impairment is recognized directly in shareholder's equity (accumulated other comprehensive income). The credit component of an other-than-temporary impairment is determined by comparing the net present value of projected future cash flows with the amortized cost basis of the fixed maturity security. The net present value is calculated by discounting the Company's best estimate of projected future cash flows at the appropriate effective interest rate. The unrealized net gains or losses (net of applicable tax effect) related to equity securities are reflected directly in shareholders' equity, unless a decline in value is determined to be other-than-temporary, in which case the loss is charged to income. In determining if and when a decline in market value below cost is other-than-temporary, an objective analysis is made of each individual security where current market value is less than cost. For any equity security where the unrealized loss exceeds 20% of original or adjusted cost, and where that decline has existed for a period of at least six months, the decline is treated as an other-than-temporary impairment. Additionally, for any equity security where the decline has existed for a period of at least one year, the decline is treated as an other-than-temporary impairment. Additionally, the Company takes into account any known subjective information in evaluating for impairment, without consideration to the Company's quantitative criteria defined above, as well as the Company's intent and ability to retain the equity security for a period of time sufficient to allow for such recovery in fair value.
Property and Equipment	Property and Equipment: Property and equipment are carried at cost, less accumulated depreciation. Depreciation is computed principally by the straight-line method.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets: Goodwill is not amortized. Rather, it is tested for impairment in accordance with FASB guidance, at the reporting-unit level. Goodwill is tested annually (during the fourth quarter) or more often if events or circumstances, such as adverse changes in the business climate, indicate there may be impairment. Intangible assets determined to have finite lives, such as customer relationships and employment agreements, are amortized over their estimated useful lives in a manner that best reflects the economic benefits of the intangible asset. In addition, impairment testing is performed on these amortizing intangible assets if impairment indicators are noted.
Reserves for Losses and Loss Expenses	Reserves for Losses and Loss Expenses: The reserves for losses and loss expenses, minor portions of which are discounted, are determined using case basis evaluations and statistical analyses and represent estimates of the ultimate cost of all reported and unreported losses which are unpaid at year end. These reserves include estimates of future trends in claim severity and frequency and other factors which could vary as the losses are ultimately settled. While actual results will differ from such estimates, management believes that the reserves for losses and loss expenses are adequate. The estimates are continually reviewed and as adjustments to these reserves become necessary, such adjustments are reflected in current operations.
Recognition of Revenue and Costs	Recognition of Revenue and Costs: Premiums are earned over the period for which insurance protection is provided. A reserve for unearned premiums, computed by the daily pro-rata method, is established to reflect amounts applicable to subsequent accounting periods. Commissions to unaffiliated companies and premium taxes applicable to unearned premiums are deferred and expensed as the related premiums are earned. The Company does not defer acquisition costs which are not directly variable with the production of premium. If it is determined that expected losses and deferred expenses will likely exceed the related unearned premiums, the asset representing deferred policy acquisition costs is reduced and an expense is charged against current operations to reflect any such premium deficiency. In the event that the expected premium deficiency exceeds deferred policy acquisition costs, an additional liability would be recorded with a corresponding expense to current operations for the amount of the excess premium deficiency. Anticipated investment income is considered in determining recoverability of deferred acquisition costs.
Reinsurance	Reinsurance: Reinsurance premiums, commissions, expense reimbursements and reserves related to reinsured business are accounted for on bases consistent with those used in accounting for the original policies issued and the terms of the reinsurance contracts. Premiums ceded to other insurers have been reported as a reduction of premium earned. Amounts applicable to reinsurance ceded for unearned premium and claim loss reserves have been reported as reinsurance recoverable assets. Certain reinsurance contracts provide for additional or return premiums and commissions based upon profits or losses to the reinsurer over prescribed periods. Estimates of additional or return premiums and commissions are adjusted quarterly to recognize actual loss experience to date as well as projected loss experience applicable to the various contract periods. Estimates of reinstatement premiums on reinsurance contracts covering catastrophic events are, to the extent reasonably determinable, recorded concurrently with the related loss. Should impairment in the ability of a reinsurer to satisfy its obligations to the Company be determined to exist, current year operations would be charged in amounts sufficient to provide for the Company's additional liability. Such charges, when incurred, are included in other operating expenses, rather than losses and loss expenses incurred, since the inability of the Company to collect from reinsurers is a credit risk rather than a deficiency associated with the loss reserving process. The Company accounts for foreign and domestic reinsurance using the periodic method. Under the periodic method, premiums are recognized as revenue ratably over the contract term, and claims, including an estimate of claims incurred but not reported, are recognized as they occur.
Deferred Taxes	Deferred Taxes: Deferred income tax assets and liabilities are recognized for temporary differences between the financial statement and tax return bases of assets and liabilities based on enacted tax rates and laws. The deferred tax benefits of the deferred tax assets are recognized to the extent realization of such benefits is more likely than not. Deferred income tax expense or benefit generally represents the net change in deferred income tax assets and liabilities during the year. Current income tax expense represents the tax liability associated with revenues and expenses currently taxable or deductible on various income tax returns for the year reported.
Restricted Stock	Restricted Stock: Restricted shares vest ratably over the vesting period from the date of grant and are accelerated for retirement eligible recipients in accordance with the non-substantive post-grant date vesting clause of Accounting Standard Codification ("ASC") 715, Compensation-Retirement Benefits. Restricted stock is valued based on the closing price of the stock on the day the award is granted. Non-vested restricted shares will be forfeited should an executive's employment terminate for any reason other than death, disability, or retirement as defined by the Compensation Committee.
Earnings Per Share	Earnings Per Share: Diluted earnings per share of common stock are based on the average number of shares of Class A and Class B common stock outstanding during the year, adjusted for the dilutive effect, if any, of restricted stock awards outstanding. Basic earnings per share are presented exclusive of the effect of share-based awards outstanding.
Comprehensive Income	Comprehensive Income: The Company records accumulated other comprehensive income from unrealized gains and losses on available-for-sale securities as a separate component of shareholders' equity. Foreign exchange adjustments are generally not material and the Company has no defined benefit pension plan. A reclassification adjustment to other comprehensive income is made for gains or losses during the period included in net income.
Fair Value Measurements	Fair Value Measurements: The Company provides disclosures related to recurring and non-recurring fair value measurements with separate disclosures for the amounts of significant transfers in and out of Level 1 and Level 2 fair value measurements, along with an explanation for the transfers. Additionally, separate disclosures are provided for purchases, sales, issuances and settlements on a gross basis for Level 3 fair value measurements as well as additional clarification for both the level of disaggregation reported for each class of assets or liabilities and disclosures of inputs and valuation techniques used to measure fair value for both recurring and non-recurring fair value measurements for assets and liabilities categorized as Level 2 or Level 3.
Recent Accounting Pronouncements	Recent Accounting Pronouncements: In January 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, or ASU 2016-01. The amendments in ASU 2016-01 change the accounting for non-consolidated equity investments that are not accounted for under the equity method of accounting by requiring changes in fair value to be recognized in income. Under current guidance, changes in fair value for investments of this nature are recognized in accumulated other comprehensive income as a component of shareholders' equity. Additionally, ASU 2016-01 simplifies the impairment assessment of equity investments without readily determinable fair values; requires entities to use the exit price when estimating the fair value of financial instruments; and modifies various presentation disclosure requirements for financial instruments. ASU 2016-01 is effective for interim and annual reporting periods beginning after December 15, 2017. The Company has not yet adopted the guidance and the adoption of this guidance is not expected to have a material impact on presentation of data in the consolidated financial statements. In May 2015, the FASB issued ASU 2015-09, Disclosures about Short-Duration Contracts, and this new guidance will enhance disclosures about an entity's insurance liabilities. This guidance will provide additional information about unpaid claims and claim development, including supplemental disaggregated incurred and paid claim data. Under the guidance, enhanced disclosures on claim frequency and reserving methodologies are required. The guidance is effective for annual periods beginning after December 15, 2015 and for interim periods beginning after December 15, 2016, however early adoption is permitted. The Company has not yet adopted the guidance and the adoption of this guidance will not impact our consolidated financial position, results of operations or cash flows. In May 2015, the FASB issued ASU 2015-07 – Fair Value Measurement – (Topic 820) Disclosures for Investments in Certain Entities that Calculate Net Asset Value per Share (or its equivalent) (a consensus of the Emerging Issues Task Force), which will be effective for fiscal years beginning after December 15, 2015. The new pronouncement was issued to ensure that all investments categorized in the fair value hierarchy are classified using a consistent approach. The Company has not yet adopted the guidance and the adoption of this guidance is not expected to have a material impact on presentation of data in the consolidated financial statements. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), to clarify the principles for recognizing revenue. While insurance contracts are not within the scope of this updated guidance, the Company's service and fee income could be subject to this updated guidance. The updated guidance requires an entity to recognize revenue as performance obligations are met, in order to reflect the transfer of promised goods or services to customers in an amount that reflects the consideration the entity is entitled to receive for those goods or services. The following steps are applied in the updated guidance: (1) identify the contract(s) with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when, or as, the entity satisfies a performance obligation. In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, which deferred the effective date of ASU 2014-09 to the quarter ending March 31, 2018. The Company is currently evaluating the impact this guidance will have on its results of operations, financial position or liquidity. The Company does not expect the guidance to have a material impact on its results of operations, financial position or liquidity.