RECENT DEVELOPMENTS AND SIGNIFICANT EVENTS	3 Months Ended
Mar. 31, 2013
Recent Developments and Significant Events [Abstract]
RECENT DEVELOPMENTS AND SIGNIFICANT EVENTS	RECENT DEVELOPMENTS AND SIGNIFICANT EVENTS Regulatory Actions: On March 19, 2012, the Memorandum of Understanding (MOU) by and between Banner Bank and the FDIC and Washington State Department of Financial Institutions, Division of Banks (originally effective March 29, 2010) was terminated. On April 10, 2012, a similar MOU by and between the Company and the Federal Reserve Bank of San Francisco (originally effective March 23, 2010) was also terminated. Income Tax Reporting and Accounting: Amended Federal Income Tax Returns: The Company has years 2008-2012 open under the Statute of Limitations provisions of the Internal Revenue Code of 1986. Refund claims have been filed for 2008 and 2009 for which carry back of NOLs and tax credits has been applied for in 2005-2007. Aside from the refund claims applied for in 2005-2007, those years are otherwise closed under the Statute of Limitations. The amended tax returns, which are under review by the Internal Revenue Service (IRS), could significantly affect the timing for recognition of credit losses within previously filed income tax returns and, if approved, would result in the refund of up to $13.6 million of previously paid taxes from the utilization of net operating loss carryback claims into prior tax years. The outcome of the IRS review is inherently uncertain, and since there can be no assurance of approval of some or all of the tax carryback claims, no asset has been recognized to reflect the possible results of these amendments as of March 31, 2013 and 2012. Accordingly, the Company does not anticipate recognizing any tax benefit until the results of the IRS review have been determined. We expect this review to be completed and the issue resolved during 2013. Deferred Tax Asset Valuation Allowance: The Company and its wholly-owned subsidiaries file consolidated U.S. federal income tax returns, as well as state income tax returns in Oregon and Idaho. Income taxes are accounted for using the asset and liability method. Under this method a deferred tax asset or liability is determined based on the enacted tax rates which are expected to be in effect when the differences between the financial statement carrying amounts and tax basis of existing assets and liabilities are expected to be reported in the Company’s income tax returns. The effect on deferred taxes of a change in tax rates is recognized in income in the period that includes the enactment date. Under GAAP, a valuation allowance is required to be recognized if it is “more likely than not” that all or a portion of Banner’s deferred tax assets will not be realized. During the quarter ended September 30, 2010, the Company evaluated its net deferred tax asset and determined it was prudent to establish a full valuation allowance against the net asset. At each subsequent quarter-end, the Company has re-analyzed that position and the Company continued to maintain a full valuation allowance through March 31, 2012. During the quarter ended June 30, 2012, management analyzed the Company’s performance and trends over the previous five quarters, focusing on trends in asset quality, loan loss provisioning, capital position, net interest margin, core operating income and net income and the likelihood of continued profitability. Based on this analysis, management determined that a full valuation allowance was no longer appropriate and reversed nearly all of the valuation allowance at that time. The Company utilized the remaining valuation allowance to offset tax expense in the third and fourth quarters of 2012. The ultimate utilization of a deferred tax valuation allowance and realization of deferred tax assets is dependent upon the existence, or generation, of taxable income in the periods when those temporary differences and net operating loss and credit carryforwards are deductible. See Note 12 of the Selected Notes to the Consolidated Financial Statements for more information. Stockholder Equity Transactions: Restricted Stock Grants: On April 24, 2012, shareholders approved the Banner Corporation 2012 Restricted Stock Plan (the Plan). Under the Plan, the Company was authorized to issue up to 300,000 shares of its common stock to provide a means for attracting and retaining highly skilled officers of Banner and its affiliates. Shares granted under the Plan have a minimum vesting period of three years. The Plan shall continue in effect for a term of ten years, after which no further awards may be granted. As of March 31, 2013, the Company had granted 97,995 shares of restricted stock from the 2012 Restricted Stock Plan and 34,257 shares in accordance with the CEO's employment agreement. Preferred Stock: On March 29, 2012, the Company’s $124 million of senior preferred stock with a liquidation value of $1,000 per share, originally issued to the U.S. Treasury as part of its Capital Purchase Program, was sold by the Treasury as part of its efforts to manage and recover its investments under the Troubled Asset Relief Program (TARP). While the sale of these preferred shares to new owners did not result in any proceeds to the Company and did not change the Company’s capital position or accounting for these securities, it did eliminate restrictions put in place by the Treasury on TARP recipients. The Treasury retained its related warrants to purchase up to $18.6 million in Banner common stock (243,998 shares). Subsequent to March 29, 2012 and by the end of the year ended December 31, 2012, the Company repurchased or redeemed all of its Series A Preferred Stock.

RECENT DEVELOPMENTS AND SIGNIFICANT EVENTS

Regulatory Actions: On March 19, 2012, the Memorandum of Understanding (MOU) by and between Banner Bank and the FDIC and Washington State Department of Financial Institutions, Division of Banks (originally effective March 29, 2010) was terminated. On April 10, 2012, a similar MOU by and between the Company and the Federal Reserve Bank of San Francisco (originally effective March 23, 2010) was also terminated.

Income Tax Reporting and Accounting:

Amended Federal Income Tax Returns: The Company has years 2008-2012 open under the Statute of Limitations provisions of the Internal Revenue Code of 1986. Refund claims have been filed for 2008 and 2009 for which carry back of NOLs and tax credits has been applied for in 2005-2007. Aside from the refund claims applied for in 2005-2007, those years are otherwise closed under the Statute of Limitations. The amended tax returns, which are under review by the Internal Revenue Service (IRS), could significantly affect the timing for recognition of credit losses within previously filed income tax returns and, if approved, would result in the refund of up to $13.6 million of previously paid taxes from the utilization of net operating loss carryback claims into prior tax years. The outcome of the IRS review is inherently uncertain, and since there can be no assurance of approval of some or all of the tax carryback claims, no asset has been recognized to reflect the possible results of these amendments as of March 31, 2013 and 2012. Accordingly, the Company does not anticipate recognizing any tax benefit until the results of the IRS review have been determined. We expect this review to be completed and the issue resolved during 2013.

Deferred Tax Asset Valuation Allowance: The Company and its wholly-owned subsidiaries file consolidated U.S. federal income tax returns, as well as state income tax returns in Oregon and Idaho. Income taxes are accounted for using the asset and liability method. Under this method a deferred tax asset or liability is determined based on the enacted tax rates which are expected to be in effect when the differences between the financial statement carrying amounts and tax basis of existing assets and liabilities are expected to be reported in the Company’s income tax returns. The effect on deferred taxes of a change in tax rates is recognized in income in the period that includes the enactment date. Under GAAP, a valuation allowance is required to be recognized if it is “more likely than not” that all or a portion of Banner’s deferred tax assets will not be realized. During the quarter ended September 30, 2010, the Company evaluated its net deferred tax asset and determined it was prudent to establish a full valuation allowance against the net asset. At each subsequent quarter-end, the Company has re-analyzed that position and the Company continued to maintain a full valuation allowance through March 31, 2012. During the quarter ended June 30, 2012, management analyzed the Company’s performance and trends over the previous five quarters, focusing on trends in asset quality, loan loss provisioning, capital position, net interest margin, core operating income and net income and the likelihood of continued profitability. Based on this analysis, management determined that a full valuation allowance was no longer appropriate and reversed nearly all of the valuation allowance at that time. The Company utilized the remaining valuation allowance to offset tax expense in the third and fourth quarters of 2012. The ultimate utilization of a deferred tax valuation allowance and realization of deferred tax assets is dependent upon the existence, or generation, of taxable income in the periods when those temporary differences and net operating loss and credit carryforwards are deductible. See Note 12 of the Selected Notes to the Consolidated Financial Statements for more information.

Stockholder Equity Transactions:

Restricted Stock Grants: On April 24, 2012, shareholders approved the Banner Corporation 2012 Restricted Stock Plan (the Plan). Under the Plan, the Company was authorized to issue up to 300,000 shares of its common stock to provide a means for attracting and retaining highly skilled officers of Banner and its affiliates. Shares granted under the Plan have a minimum vesting period of three years. The Plan shall continue in effect for a term of ten years, after which no further awards may be granted. As of March 31, 2013, the Company had granted 97,995 shares of restricted stock from the 2012 Restricted Stock Plan and 34,257 shares in accordance with the CEO's employment agreement.

Preferred Stock: On March 29, 2012, the Company’s $124 million of senior preferred stock with a liquidation value of $1,000 per share, originally issued to the U.S. Treasury as part of its Capital Purchase Program, was sold by the Treasury as part of its efforts to manage and recover its investments under the Troubled Asset Relief Program (TARP). While the sale of these preferred shares to new owners did not result in any proceeds to the Company and did not change the Company’s capital position or accounting for these securities, it did eliminate restrictions put in place by the Treasury on TARP recipients. The Treasury retained its related warrants to purchase up to $18.6 million in Banner common stock (243,998 shares). Subsequent to March 29, 2012 and by the end of the year ended December 31, 2012, the Company repurchased or redeemed all of its Series A Preferred Stock.