Organization	6 Months Ended
Jun. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Note 1. Organization PacWest Bancorp is a bank holding company registered under the Bank Holding Company Act of 1956, as amended. Our principal business is to serve as the holding company for our Los Angeles‑based wholly‑owned banking subsidiary, Pacific Western Bank, which we refer to as “Pacific Western” or the “Bank.” When we say “we,” “our,” or the “Company,” we mean the Company on a consolidated basis with the Bank. When we refer to “PacWest” or to the holding company, we are referring to the parent company on a stand‑alone basis. As of June 30, 2014, we had total assets of $15.7 billion, total loans and leases of $11.1 billion, total deposits of $11.7 billion and total stockholders' equity of $3.4 billion. Pacific Western is a full-service commercial bank offering a broad range of banking products and services including: accepting demand, money market, and time deposits; originating loans and leases, including an array of commercial real estate loans and commercial lending products. The Bank has a foundation of locally generated and relationship-based deposits, with 81 full-service branches located throughout the state of California. Our branch operations are located primarily in Southern California extending from San Diego County to California’s Central Coast, and we operate three banking offices in the San Francisco Bay area and two offices in the Central Valley. Our targeted collateral for our real estate loan offerings includes healthcare properties, office properties, industrial properties, multifamily properties, hospitality properties, and retail properties. Our commercial loan products include equipment loans and leases, asset-based loans, lender finance loans and loans secured by borrower future cash flows. As a result of the CapitalSource Inc. merger, Pacific Western Bank established the CapitalSource Division, which we also refer to as the National Lending segment. The CapitalSource Division provides on a nationwide basis a full spectrum of financing solutions across numerous industries and property types to small to middle market businesses. Pacific Western’s leasing operation, Pacific Western Equipment Finance, and its group specializing in asset-based lending, CapitalSource Business Finance Group (formerly BFI Business Finance and First Community Financial), also became part of the CapitalSource Division. The CapitalSource Division’s loan and lease origination efforts are conducted through offices located in Chevy Chase, Maryland; Los Angeles and San Jose, California; Denver, Colorado; Chicago, Illinois; New York, New York; and Midvale, Utah. When we refer to "CapitalSource Inc." we are referring to the company acquired on April 7, 2014 and when we refer to the "CapitalSource Division" we are referring to a division of Pacific Western Bank that specializes in middle-market lending on a nationwide basis. We generate our revenue primarily from interest received on loans and leases and, to a lesser extent, from interest received on investment securities, and fees received in connection with deposit services, extending credit and other services offered, including foreign exchange services. Our major operating expenses are the interest paid by the Bank on deposits and borrowings, compensation and general operating expenses. We have completed 27 acquisitions from May 2000 through June 30, 2014, including the acquisition of CapitalSource Inc. on April 7, 2014. Since 2000, our acquisitions have been accounted for using the acquisition method of accounting and, accordingly, the operating results of the acquired entities have been included in the condensed consolidated financial statements from their respective acquisition dates. See Note 3, Acquisitions, for more information about the CapitalSource Inc. merger and the acquisition of First California Financial Group, Inc. ("FCAL") on May 31, 2013. Significant Accounting Policies Except as discussed below, our accounting policies are described in Note 1, Nature of Operations and Summary of Significant Accounting Policies, of our audited consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2013 as filed with the Securities and Exchange Commission ("Form 10-K"). Basis of Presentation Our interim consolidated financial statements are prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and pursuant to the requirements for reporting on Form 10-Q and Article 10 of Regulation S-X of the Securities Exchange Act of 1934. Accordingly, certain disclosures accompanying annual consolidated financial statements are omitted. In the opinion of management, all adjustments and eliminations, consisting solely of normal recurring accruals, considered necessary for the fair presentation of financial statements for the interim periods, have been included. The current period's results of operations are not necessarily indicative of the results that ultimately may be achieved for the year. The interim consolidated financial statements and notes thereto should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Form 10-K. The accompanying financial statements reflect our consolidated accounts. All significant intercompany accounts and transactions have been eliminated. Use of Estimates We have made a number of estimates and assumptions relating to the reporting of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period to prepare these condensed consolidated financial statements in conformity with GAAP. Actual results could differ from those estimates. Material estimates subject to change in the near term include, among other items, the allowance for credit losses, the carrying value of intangible assets, the carrying value of the FDIC loss sharing asset, the realization of deferred tax assets, and the fair value estimates of assets acquired and liabilities assumed in acquisitions. As described in Note 3, Acquisitions, the acquired assets and liabilities of CapitalSource Inc. and FCAL were measured at their estimated fair values. We made significant estimates and exercised significant judgment in estimating fair values and accounting for such acquired assets and assumed liabilities. Reclassifications Certain prior period amounts have been reclassified to conform to the current period’s presentation format. As of June 30, 2014, the "Leases" loan portfolio segment is included in the "Equipment finance" class category of the "Commercial" loan portfolio segment; loan-related legal expenses which were previously reported within the "Other professional services" category are reported within the "Other expense" category; and other foreclosed assets which were previously reported within the "Other assets" category are reported within the "Foreclosed assets, net" category.

Note 1. Organization

PacWest Bancorp is a bank holding company registered under the Bank Holding Company Act of 1956, as amended. Our principal business is to serve as the holding company for our Los Angeles‑based wholly‑owned banking subsidiary, Pacific Western Bank, which we refer to as “Pacific Western” or the “Bank.” When we say “we,” “our,” or the “Company,” we mean the Company on a consolidated basis with the Bank. When we refer to “PacWest” or to the holding company, we are referring to the parent company on a stand‑alone basis. As of June 30, 2014, we had total assets of $15.7 billion, total loans and leases of $11.1 billion, total deposits of $11.7 billion and total stockholders' equity of $3.4 billion.

Pacific Western is a full-service commercial bank offering a broad range of banking products and services including: accepting demand, money market, and time deposits; originating loans and leases, including an array of commercial real estate loans and commercial lending products. The Bank has a foundation of locally generated and relationship-based deposits, with 81 full-service branches located throughout the state of California. Our branch operations are located primarily in Southern California extending from San Diego County to California’s Central Coast, and we operate three banking offices in the San Francisco Bay area and two offices in the Central Valley. Our targeted collateral for our real estate loan offerings includes healthcare properties, office properties, industrial properties, multifamily properties, hospitality properties, and retail properties. Our commercial loan products include equipment loans and leases, asset-based loans, lender finance loans and loans secured by borrower future cash flows.

As a result of the CapitalSource Inc. merger, Pacific Western Bank established the CapitalSource Division, which we also refer to as the National Lending segment. The CapitalSource Division provides on a nationwide basis a full spectrum of financing solutions across numerous industries and property types to small to middle market businesses. Pacific Western’s leasing operation, Pacific Western Equipment Finance, and its group specializing in asset-based lending, CapitalSource Business Finance Group (formerly BFI Business Finance and First Community Financial), also became part of the CapitalSource Division. The CapitalSource Division’s loan and lease origination efforts are conducted through offices located in Chevy Chase, Maryland; Los Angeles and San Jose, California; Denver, Colorado; Chicago, Illinois; New York, New York; and Midvale, Utah. When we refer to "CapitalSource Inc." we are referring to the company acquired on April 7, 2014 and when we refer to the "CapitalSource Division" we are referring to a division of Pacific Western Bank that specializes in middle-market lending on a nationwide basis.

We generate our revenue primarily from interest received on loans and leases and, to a lesser extent, from interest received on investment securities, and fees received in connection with deposit services, extending credit and other services offered, including foreign exchange services. Our major operating expenses are the interest paid by the Bank on deposits and borrowings, compensation and general operating expenses.

We have completed 27 acquisitions from May 2000 through June 30, 2014, including the acquisition of CapitalSource Inc. on April 7, 2014. Since 2000, our acquisitions have been accounted for using the acquisition method of accounting and, accordingly, the operating results of the acquired entities have been included in the condensed consolidated financial statements from their respective acquisition dates. See Note 3, Acquisitions, for more information about the CapitalSource Inc. merger and the acquisition of First California Financial Group, Inc. ("FCAL") on May 31, 2013.

Significant Accounting Policies

Except as discussed below, our accounting policies are described in Note 1, Nature of Operations and Summary of Significant Accounting Policies, of our audited consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2013 as filed with the Securities and Exchange Commission ("Form 10-K").

Basis of Presentation

Our interim consolidated financial statements are prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and pursuant to the requirements for reporting on Form 10-Q and Article 10 of Regulation S-X of the Securities Exchange Act of 1934. Accordingly, certain disclosures accompanying annual consolidated financial statements are omitted. In the opinion of management, all adjustments and eliminations, consisting solely of normal recurring accruals, considered necessary for the fair presentation of financial statements for the interim periods, have been included. The current period's results of operations are not necessarily indicative of the results that ultimately may be achieved for the year. The interim consolidated financial statements and notes thereto should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Form 10-K.

The accompanying financial statements reflect our consolidated accounts. All significant intercompany accounts and transactions have been eliminated.

Use of Estimates

We have made a number of estimates and assumptions relating to the reporting of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period to prepare these condensed consolidated financial statements in conformity with GAAP. Actual results could differ from those estimates. Material estimates subject to change in the near term include, among other items, the allowance for credit losses, the carrying value of intangible assets, the carrying value of the FDIC loss sharing asset, the realization of deferred tax assets, and the fair value estimates of assets acquired and liabilities assumed in acquisitions.

As described in Note 3, Acquisitions, the acquired assets and liabilities of CapitalSource Inc. and FCAL were measured at their estimated fair values. We made significant estimates and exercised significant judgment in estimating fair values and accounting for such acquired assets and assumed liabilities.

Reclassifications

Certain prior period amounts have been reclassified to conform to the current period’s presentation format. As of June 30, 2014, the "Leases" loan portfolio segment is included in the "Equipment finance" class category of the "Commercial" loan portfolio segment; loan-related legal expenses which were previously reported within the "Other professional services" category are reported within the "Other expense" category; and other foreclosed assets which were previously reported within the "Other assets" category are reported within the "Foreclosed assets, net" category.