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Accounting Policies and Basis of Presentation Policies (Policies) | 3 Months Ended
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Mar. 31, 2015
Accounting Policies [Abstract] |
Reclassification, Policy [Policy Text Block] | Reclassifications Prior period financial statements reflect the retrospective application of Accounting Standards Update ("ASU") 2014-01, Investments - Equity Method and Joint Ventures (Topic 323): Accounting for Investments Qualified Affordable Housing Projects which was adopted effective in the fourth quarter of 2014 and did not have a material impact on our consolidated financial condition or results of operations. In certain instances other than the retrospective adoption of ASU 2014-01, amounts reported in prior years' consolidated financial statements have been reclassified to conform to the current financial statement presentation. Such reclassifications had no effect on previously reported shareholders' equity or net income.
Use of Estimates, Policy [Policy Text Block] | Use of Estimates in the Preparation of Financial Statements The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates, and different assumptions in the application of these policies could result in material changes in BancShares' consolidated financial position, the consolidated results of its operations or related disclosures. Material estimates that are particularly susceptible to significant change include:
• | Allowance for loan and lease losses
• | Fair value of financial instruments, including acquired assets and assumed liabilities
• | Pension plan assumptions
• | Cash flow estimates on purchased credit-impaired loans
• | Receivable from and payable to the FDIC for loss share agreements
• | Income tax assets, liabilities and expense
New Accounting Pronouncements, Policy [Policy Text Block] | Recently Issued Accounting Pronouncements FASB ASU 2015-03, Interest–Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs This ASU simplifies the presentation of debt issuance costs by requiring that debt issuance costs be presented in the balance sheet as a direct deduction from the carrying amount of debt liability, consistent with debt discounts or premiums. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this update. This ASU is effective for interim and annual periods beginning after December 15, 2015 for public companies, and is to be applied retrospectively. Early adoption is permitted. We will adopt the guidance effective in the first quarter of 2016. FASB ASU 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis This ASU improves targeted areas of consolidation guidance for reporting organizations that are required to evaluate whether they should consolidate certain legal entities. In addition to reducing the number of consolidation models from four to two, the new standard places more emphasis on risk of loss when determining a controlling financial interest, reducing the frequency of the application of related-party guidance when determining a controlling financial interest in a variable interest entity ("VIE"), and changing consolidation conclusions for public and private companies in several industries that typically make use of limited partnerships or VIEs. The amendments in this ASU are effective for periods beginning after December 15, 2015 for public companies. Early adoption is permitted. We will adopt the guidance effective in the first quarter of 2016 and do not anticipate any significant impact on our consolidated financial position or consolidated results of operations as a result of adoption. FASB ASU 2014-09, Revenue from Contracts with Customers (Topic 606) In May 2014, the FASB issued a standard on the recognition of revenue from contracts with customers with the core principle being for companies to recognize revenue to depict the transfer of goods or services to customers in amounts that reflect the consideration to which the company expects to be entitled in exchange for those goods or services. The new standard also results in enhanced disclosures about revenue, provides guidance for transactions that were not previously addressed comprehensively and improves guidance for multiple-element arrangements. The guidance in this ASU is effective for fiscal periods beginning after December 15, 2016, including interim reporting periods within that reporting period. Early adoption is not permitted. We are currently evaluating the impact of the new standard and we will adopt during the first quarter of 2017 using one of two retrospective application methods.

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- Definition Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact. + References No definition available. + Details
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- Definition Disclosure of accounting policy for reclassifications that affects the comparability of the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6359566&loc=d3e326-107755 + Details
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- Definition Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6143-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6132-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6061-108592 + Details
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