Accounting Policies, by Policy (Policies)	12 Months Ended
Dec. 31, 2012
Use of Estimates, Policy [Policy Text Block]	Accounting Estimates. Certain accounting policies underlying the preparation of these financial statements require Management to make estimates and judgments about future economic and market conditions. These estimates and judgments may affect reported amounts of assets and liabilities, revenues and expenses, and disclosures of contingent assets and liabilities. Although the estimates contemplate current conditions and how Management expects them to change in the future, it is reasonably possible that in 2013 actual conditions could be worse than anticipated in those estimates, which could materially affect our results of operations and financial conditions. The most significant of these involve the Allowance for Credit Losses, as discussed below under “Allowance for Credit Losses,” estimated fair values of purchased loans, as discussed below under “Purchased Loans,” and the evaluation of other than temporary impairment, as discussed below under “Securities.” As described in Note 2 below, the Bank acquired assets and assumed liabilities of the former Sonoma Valley Bank (“Sonoma”) on August 20, 2010. The acquired assets and assumed liabilities were measured at estimated fair values, as required by Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) 805, Business Combinations, formerly FASB Statement No. 141 (revised 2007). Management made significant estimates and exercised significant judgment in accounting for the acquisition. Management judgmentally measured loan fair values based on loan file reviews (including borrower financial statements and tax returns), appraised collateral values, expected cash flows, and historical loss factors. Repossessed loan collateral was primarily valued based upon appraised collateral values. The Bank also recorded an identifiable intangible asset representing the value of the core deposit customer base of Sonoma based on Management’s evaluation of the cost of such deposits relative to alternative funding sources. In determining the value of the identifiable intangible asset, Management used significant estimates including average lives of depository accounts, future interest rate levels, the cost of servicing various depository products, FDIC assessment rates and other significant estimates. Management used quoted market prices to determine the fair value of investment securities and FHLB advances. The Bank acquired assets and assumed liabilities of the former County Bank (“County”) on February 6, 2009 from the Federal Deposit Insurance Corporation (“FDIC”). The acquired assets and assumed liabilities of County were measured at estimated fair values, as required by the acquisition method of accounting for business combinations (FASB ASC 805). Management made significant estimates and exercised significant judgment in accounting for the acquisition of County. Management judgmentally assigned risk ratings to loans. The assigned risk ratings, appraised collateral values, expected cash flows, current interest rates, and statistically derived loss factors were used to measure fair values for loans. Repossessed loan collateral was primarily valued based upon appraised collateral values. Due to the loss-sharing agreements with the FDIC, the Bank recorded a receivable from the FDIC equal to 80 percent of the loss estimates embedded in the fair values of loans and repossessed loan collateral. The Bank also recorded an identifiable intangible asset representing the value of the core deposit customer base of County based on an appraisal performed by an independent third party. In determining the value of the identifiable intangible asset, the third-party appraiser used significant estimates including average lives of depository accounts, future interest rate levels, the cost of servicing various depository products, and other significant estimates. Management used quoted market prices to determine the fair value of investment securities, FHLB advances and other borrowings. The acquired assets of Sonoma include loans which are not indemnified by the FDIC. The acquired loans of County are indemnified under loss-sharing agreements with the FDIC. Pursuant to acquisition accounting, the loans in each business combination were measured at their estimated fair value at the respective acquisition date. This method of measuring the carrying value of purchased loans differs from loans originated by the Company, and as such, the Company identifies purchased loans not indemnified by the FDIC as “Purchased Non-covered Loans” and purchased loans indemnified by the FDIC as “Purchased Covered Loans.” Loans originated by the Company are measured at the principal amount outstanding, net of unearned discount and unamortized deferred fees and costs. These loans are identified as “Originated Loans.”
Consolidation, Policy [Policy Text Block]	Principles of Consolidation. The consolidated financial statements include the accounts of the Company and all the Company’s subsidiaries. Significant intercompany transactions have been eliminated in consolidation. The Company does not maintain or conduct transactions with any unconsolidated special purpose entities.
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash Equivalents. Cash equivalents include Due From Banks balances and Federal Funds Sold which are both readily convertible to known amounts of cash and are generally 90 days or less from maturity at the time of initiation, presenting insignificant risk of changes in value due to interest rate changes.
Marketable Securities, Policy [Policy Text Block]	Securities. Investment securities consist of debt securities of the U.S. Treasury, government sponsored entities, states, counties, municipalities, corporations, mortgage-backed securities, asset-backed securities and equity securities. Securities transactions are recorded on a trade date basis. The Company classifies its debt and marketable equity securities in one of three categories: trading, available for sale or held to maturity. Trading securities are bought and held principally for the purpose of selling them in the near term. Trading securities are recorded at fair value with unrealized gains and losses included in earnings. Held to maturity securities are those debt securities which the Company has the ability and intent to hold until maturity. Held to maturity securities are recorded at cost, adjusted for the amortization of premiums or accretion of discounts. Securities not included in trading or held to maturity are classified as available for sale. Available for sale securities are recorded at fair value. Unrealized gains and losses, net of the related tax effect, on available for sale securities are included in other comprehensive income. A decline in the market value of any available for sale or held to maturity security below cost that is deemed other than temporary results in a charge to earnings and the establishment of a new cost basis for the security. Unrealized investment securities losses are evaluated at least quarterly to determine whether such declines in value should be considered “other than temporary” and therefore be subject to immediate loss recognition in income. Although these evaluations involve significant judgment, an unrealized loss in the fair value of a debt security is generally deemed to be temporary when the fair value of the security is below the carrying value primarily due to changes in risk-free interest rates, there has not been significant deterioration in the financial condition of the issuer, and the Company does not intend to sell or be required to sell the securities before recovery of its amortized cost. An unrealized loss in the value of an equity security is generally considered temporary when the fair value of the security declined primarily due to current market conditions and not deterioration in the financial condition of the issuer, the Company expects the fair value of the security to recover in the near term and the Company does not intend to sell or be required to sell the securities before recovery of its amortized cost. Other factors that may be considered in determining whether a decline in the value of either a debt or an equity security is “other than temporary” include ratings by recognized rating agencies, actions of commercial banks or other lenders relative to the continued extension of credit facilities to the issuer of the security, the financial condition, capital strength and near-term prospects of the issuer, and recommendations of investment advisors or market analysts. Purchase premiums are amortized and purchase discounts are accreted over the estimated life of the related investment security as an adjustment to yield using the effective interest method. Unamortized premiums, unaccreted discounts, and early payment premiums are recognized as a component of gain or loss on sale upon disposition of the related security. Interest and dividend income are recognized when earned. Realized gains and losses from the sale of available for sale securities are included in earnings using the specific identification method.
Cost Method Investments, Policy [Policy Text Block]	Nonmarketable Equity Securities. Nonmarketable equity securities include securities that are not publicly traded, such as Visa Class B common stock, and securities acquired for various purposes, such as to meet regulatory requirements (for example, Federal Home Loan Bank and Federal Reserve Bank stock, which are restricted). These securities are accounted for under the cost method and are included in other assets. The Company reviews those assets accounted for under the cost method at least quarterly for possible declines in value that are considered “other than temporary”. The Company’s review typically includes an analysis of the facts and circumstances of each investment, the expectations for the investment’s cash flows and capital needs, the viability of its business model and exit strategy. The asset value is reduced when a decline in value is considered to be other than temporary. The Company recognizes the estimated loss in noninterest income.
Finance, Loans and Leases Receivable, Policy [Policy Text Block]	Loans. Loans are stated at the principal amount outstanding, net of unearned discount and unamortized deferred fees and costs. Interest is accrued daily on the outstanding principal balances. Loans which are more than 90 days delinquent with respect to interest or principal, unless they are well secured and in the process of collection, and other loans on which full recovery of principal or interest is in doubt, are placed on nonaccrual status. Interest previously accrued on loans placed on nonaccrual status is charged against interest income. In addition, some loans secured by real estate with temporarily impaired values and commercial loans to borrowers experiencing financial difficulties are placed on nonaccrual status (“performing nonaccrual loans”) even though the borrowers continue to repay the loans as scheduled. When the ability to fully collect nonaccrual loan principal is in doubt, payments received are applied against the principal balance of the loans until such time as full collection of the remaining recorded balance is expected. Any additional interest payments received after that time are recorded as interest income on a cash basis. Performing nonaccrual loans are reinstated to accrual status when improvements in credit quality eliminate the doubt as to the full collectability of both interest and principal. Certain consumer loans or auto receivables are charged to the allowance for credit losses when they become 120 days past due. The Company recognizes a loan as impaired when, based on current information and events, it is probable that it will be unable to collect both the contractual interest and principal payments as scheduled in the loan agreement. Income recognition on impaired loans conforms to that used on nonaccrual loans. In certain circumstances, the Company might agree to restructured loan terms with borrowers experiencing financial difficulties; such restructured loans are evaluated under ASC 310-40, “Troubled Debt Restructurings by Creditors.” In general, a restructuring constitutes a troubled debt restructuring when the Company, for reasons related to a borrower’s financial difficulties, grants a concession to the borrower it would not otherwise consider. Loans are evaluated on an individual basis. The Company follows its general nonaccrual policy for troubled debt restructurings. Performing troubled debt restructurings are reinstated to accrual status when improvements in credit quality eliminate the doubt as to full collectability of both principal and interest. Nonrefundable fees and certain costs associated with originating or acquiring loans are deferred and amortized as an adjustment to interest income over the contractual loan lives. Upon prepayment, unamortized loan fees, net of costs, are immediately recognized in interest income. Other fees, including those collected upon principal prepayments, are included in interest income when received. Loans held for sale are identified upon origination and are reported at the lower of cost or market value on an aggregate loan basis. Purchased Loans. Purchased loans are recorded at estimated fair value on the date of purchase. Impaired purchased loans are accounted for under FASB ASC 310-30, Loans and Debt Securities with Deteriorated Credit Quality, when the loans have evidence of credit deterioration since origination and it is probable at the date of acquisition that the Company will not collect all contractually required principal and interest payments. Evidence of credit quality deterioration as of the purchase date may include attributes such as past due and nonaccural status. Generally, purchased loans that meet the Company’s definition for nonaccrual status fall within the scope of FASB ASC 310-30. The difference between contractually required payments at acquisition and the cash flows expected to be collected at acquisition is referred to as the nonaccretable difference. Subsequent decreases to the expected cash flows will generally result in a provision for loan losses. Subsequent increases in cash flows result in a reversal of the provision for loan losses to the extent of prior charges, or a reclassification of the difference from nonaccretable to accretable with a positive impact on interest income. Any excess of expected cash flows over the estimated fair value is referred to as the accretable yield and is recognized into interest income over the remaining life of the loan when there is a reasonable expectation about the amount and timing of such cash flows. Further, the Company elected to analogize to ASC 310-30 and account for all other loans that had a discount due in part to credit not within the scope of ASC 310-30 using the same methodology. Covered Loans. Loans covered under loss-sharing or similar credit protection agreements with the FDIC are reported in loans exclusive of the expected reimbursement cash flows from the FDIC. Covered loans are initially recorded at fair value at the acquisition date. Subsequent decreases in the amount expected to be collected results in a provision for loan losses and a corresponding increase in the estimated FDIC reimbursement, with the estimated net loss impacting earnings. Interest previously accrued on covered loans placed on nonaccrual status is charged against interest income, net of estimated FDIC reimbursements of such accrued interest. The FDIC reimburses the Company up to 80% of 90 days interest on covered loans.
Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block]	Allowance for Credit Losses. The allowance for credit losses is established through provisions for credit losses charged to income. Losses on loans, including impaired loans, are charged to the allowance for loan losses when all or a portion of the recorded amount of a loan is deemed to be uncollectible. Recoveries of loans previously charged off are credited to the allowance when realized. The Company’s allowance for credit losses is maintained at a level considered adequate to provide for losses that can be estimated based upon specific and general conditions. These include conditions unique to individual borrowers, as well as overall credit loss experience, the amount of past due, nonperforming and classified loans, recommendations of regulatory authorities, prevailing economic conditions, FDIC loss-sharing or similar credit protection agreements and other factors. A portion of the allowance is specifically allocated to impaired loans whose full collectability is uncertain. Such allocations are determined by Management based on loan-by-loan analyses. A second allocation is based in part on quantitative analyses of historical credit loss experience, in which criticized and classified loan balances identified through an internal loan review process are analyzed using a statistical model to determine standard loss rates. The results of this analysis are applied to current criticized and classified loan balances to allocate the reserve to the respective commercial, commercial real estate, and construction segments of the loan portfolio. In addition, residential real estate and consumer loans which have similar characteristics and are not usually criticized using regulatory guidelines are analyzed and reserves established based on the historical loss rates and delinquency trends, grouped by the number of days the payments on these loans are delinquent. Last, allocations are made to non-criticized and non-classified commercial, commercial real estate and construction loans based on historical loss rates. The remainder of the reserve is considered to be unallocated. The unallocated allowance is established to provide for probable losses that have been incurred as of the reporting date but not reflected in the allocated allowance. It addresses additional qualitative factors consistent with Management’s analysis of the level of risks inherent in the loan portfolio, which are related to the risks of the Company’s general lending activity. Included in the unallocated allowance is the risk of losses that are attributable to national or local economic or industry trends which have occurred but have not yet been recognized in past loan charge-off history (external factors). The external factors evaluated by the Company include: economic and business conditions, external competitive issues, and other factors. Also included in the unallocated allowance is the risk of losses that are attributable to general attributes of the Company’s loan portfolio and credit administration (internal factors). The internal factors evaluated by the Company include: loan review system, adequacy of lending Management and staff, loan policies and procedures, problem loan trends, concentrations of credit, and other factors. By their nature, these risks are not readily allocable to any specific category in a statistically meaningful manner and are difficult to quantify with a specific number.
Off-Balance-Sheet Credit Exposure, Policy [Policy Text Block]	Liability for Off-Balance Sheet Credit Exposures. A liability for off-balance sheet credit exposures is established through expense recognition. Off-balance sheet credit exposures relate to letters of credit and unfunded loan commitments for commercial and construction loans. Historical credit loss factors for commercial and construction loans are applied to the amount of these off-balance sheet credit exposures to estimate inherent losses.
Loans and Leases Receivable, Real Estate Acquired Through Foreclosure, Policy [Policy Text Block]	Other Real Estate Owned. Other real estate owned is comprised of property acquired through foreclosure proceedings, acceptances of deeds-in-lieu of foreclosure and, if applicable, vacated bank properties. Losses recognized at the time of acquiring property in full or partial satisfaction of debt are charged against the allowance for credit losses. Other real estate owned is recorded at the lower of the related loan carrying value or fair value of the collateral, generally based upon an independent property appraisal, less estimated disposition costs. Subsequently, other real estate owned is valued at the lower of the amount recorded at the date acquired or the then current fair value less estimated disposition costs. Subsequent losses incurred due to any decline in annual independent property appraisals are recognized as noninterest expense. Routine holding costs, such as property taxes, insurance and maintenance, and losses from sales and dispositions, are recognized as noninterest expense. Covered Other Real Estate Owned. Other real estate owned covered under loss-sharing agreements with the FDIC is reported exclusive of expected reimbursement cash flows from the FDIC. Upon transferring covered loan collateral to covered other real estate owned status, acquisition date fair value discounts on the related loans are also transferred to covered other real estate owned. Fair value adjustments on covered other real estate owned result in a reduction of the covered other real estate carrying amount and a corresponding increase in the estimated FDIC reimbursement, with the estimated net loss charged against earnings.
Property, Plant and Equipment, Policy [Policy Text Block]	Premises and Equipment. Premises and equipment are stated at cost, less accumulated depreciation and amortization. Depreciation is computed substantially on the straight-line method over the estimated useful life of each type of asset. Estimated useful lives of premises and equipment range from 20 to 50 years and from 3 to 20 years, respectively. Leasehold improvements are amortized over the terms of the lease or their estimated useful life, whichever is shorter.
Goodwill and Intangible Assets, Policy [Policy Text Block]	Intangible Assets. Intangible assets are comprised of goodwill, core deposit intangibles and other identifiable intangibles acquired in business combinations. Intangible assets with definite useful lives are amortized on an accelerated basis over their respective estimated useful lives not exceeding 15 years. If an event occurs that indicates the carrying amount of an intangible asset may not be recoverable, Management reviews the asset for impairment. Any goodwill and any intangible asset acquired in a purchase business combination determined to have an indefinite useful life is not amortized, but is evaluated for impairment annually. The Company has the option to first assess qualitative factors to determine the likelihood of impairment pursuant to FASB ASU 2011-08, Testing for Goodwill Impairment. Although the Company has to the option to first assess qualitative factors when determining if impairment exists, the Company has opted to perform a quantitative analysis to determine if an impairment exists.
Impairment Of Long Lived Assets [Policy Text Block]	Impairment of Long-Lived Assets. The Company reviews its long-lived and certain intangible assets for impairment whenever events or changes indicate that the carrying amount of an asset may not be recoverable. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets. Assets to be disposed of are reported at the lower of the carrying amount or fair value less costs to sell.
Income Tax, Policy [Policy Text Block]	Income Taxes. The Company and its subsidiaries file consolidated tax returns. The Company accounts for income taxes in accordance with FASB ASC 740, Income Taxes, resulting in two components of income tax expense: current and deferred. Current income tax expense approximates taxes to be paid or refunded for the current period. The Company determines deferred income taxes using the balance sheet method. Under this method, the net deferred tax asset or liability is based on the tax effects of the differences between the book and tax bases of assets and liabilities, and recognizes enacted changes in tax rates and laws in the period in which they occur. Deferred income tax expense results from changes in deferred tax assets and liabilities between periods. Deferred tax assets are recognized subject to Management’s judgment that realization is more likely than not. A tax position that meets the more likely than not recognition threshold is measured to determine the amount of benefit to recognize. The tax position is measured at the largest amount of benefit that is greater than fifty percent likely of being realized upon settlement. Interest and penalties are recognized as a component of income tax expense.
Derivatives, Policy [Policy Text Block]	Derivative Instruments and Hedging Activities. The Company’s accounting policy for derivative instruments requires the Company to recognize those items as assets or liabilities in the statement of financial position and measure them at fair value. Hybrid financial instruments are single financial instruments that contain an embedded derivative. The Company’s accounting policy is to record certain hybrid financial instruments at fair value without separating the embedded derivative.
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]	Stock Options. The Company applies FASB ASC 718 – Compensation – Stock Compensation, to account for stock based awards granted to employees using the fair value method. The Company recognizes compensation expense for restricted performance share grants over the relevant attribution period. Restricted performance share grants have no exercise price, therefore, the intrinsic value is measured using an estimated per share price at the vesting date for each restricted performance share. The estimated per share price is adjusted during the attribution period to reflect actual stock price performance. The Company’s obligation for unvested outstanding restricted performance share grants is classified as a liability until the vesting date due to a cash settlement feature, at which time the issued shares become classified as shareholders’ equity.
Extinguishment Of Debt [Policy Text Block]	Extinguishment of Debt. Gains and losses, including fees, incurred in connection with the early extinguishment of debt are charged to current earnings as reductions in noninterest income.
Postemployment Benefit Plans, Policy [Policy Text Block]	Postretirement Benefits. The Company uses an actuarial-based accrual method of accounting for post-retirement benefits.
Fiduciary [Policy Text Block]	Other. Securities and other property held by the Bank in a fiduciary or agency capacity are not included in the financial statements since such items are not assets of the Company or its subsidiaries.
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Adopted Accounting Pronouncements In 2012, the Company adopted the following new accounting guidance: FASB ASU 2011-03, Reconsideration of Effective Control for Repurchase Agreements, was issued April 2011 addressing the accounting for repurchase agreements and other agreements that both entitle and obligate a transferor to repurchase or redeem financial assets before their maturity. The amendments remove from the assessment of effective control (1) the criterion requiring the transferor to have the ability to repurchase or redeem the financial assets on substantially the agreed terms, even in the event of default by the transferee, and (2) the collateral maintenance implementation guidance related to that criterion. The Company adopted the provisions of the Update in the first quarter of 2012 with prospective application to new transactions or existing transactions modified on or after January 1, 2012. The adoption of the Update did not have a material effect on the Company’s financial statements at the date of adoption. FASB ASU 2011-04, Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRSs, was issued May 2011 as a result of the FASB and International Accounting Standards Board’s (IASB) goal to develop common requirements for measuring fair value and for disclosing information about fair value measurements in accordance with U.S. generally accepted accounting principles and International Financial Reporting Standards. The Company adopted the provisions of the Update in the first quarter of 2012 with prospective application, resulting in expanded fair value disclosure. The adoption of the Update did not have a material effect on the Company’s financial statements at the date of adoption. FASB ASU 2011-05, Presentation of Comprehensive Income, was issued June 2011 requiring that all changes in stockholders’ equity be presented either in a single continuous statement of comprehensive income or in two separate but consecutive statements. This Update also requires that reclassification adjustments for items that are reclassified from other comprehensive income to net income be presented on the face of the financial statements. The Company adopted the provisions of the Update in the first quarter of 2012 with retrospective application, resulting in the addition of a new financial statement titled “Consolidated Statements of Comprehensive Income”. FASB ASU 2011-12, Deferral of the Effective Date for Amendments to the Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income in Accounting Standards Update No. 2011-05, was issued December 2011 updating and superseding certain pending paragraphs relating to the presentation on the face of the financial statements the effects of reclassifications out of accumulated other comprehensive income on the components of net income and other comprehensive income. This Update was effective concurrent with ASU 2011-05, Presentation of Comprehensive Income, and did not have a material effect on the Company’s financial statements at the date of adoption. Recently Issued Accounting Standards FASB ASU 2012-06, Subsequent Accounting for an Indemnification Asset Recognized at the Acquisition Date as a Result of a Government-Assisted Acquisition of a Financial Institution, was issued October 2012 to provide guidance for consistently measuring an indemnification asset subsequent to acquisition. Subsequent accounting for changes in the measurement of the indemnification asset should be on the same basis as a change in the assets subject to indemnification. Any amortization of changes in value is limited to the shorter of the contractual term of the indemnification agreement or the remaining life of the indemnified assets. The amendments are effective for fiscal years, and interim periods within those years, beginning on or after December 15, 2012, with early adoption permitted. The amendments will not have a material effect on the Company’s financial statements at the date of adoption since the Company’s historical accounting treatment is consistent with ASU 2012-06.

Accounting Policies, by Policy (Policies)

12 Months Ended

Dec. 31, 2012

Use of Estimates, Policy [Policy Text Block]

Accounting Estimates. Certain accounting policies underlying the preparation of these financial statements require Management to make estimates and judgments about future economic and market conditions. These estimates and judgments may affect reported amounts of assets and liabilities, revenues and expenses, and disclosures of contingent assets and liabilities. Although the estimates contemplate current conditions and how Management expects them to change in the future, it is reasonably possible that in 2013 actual conditions could be worse than anticipated in those estimates, which could materially affect our results of operations and financial conditions. The most significant of these involve the Allowance for Credit Losses, as discussed below under “Allowance for Credit Losses,” estimated fair values of purchased loans, as discussed below under “Purchased Loans,” and the evaluation of other than temporary impairment, as discussed below under “Securities.”

As described in Note 2 below, the Bank acquired assets and assumed liabilities of the former Sonoma Valley Bank (“Sonoma”) on August 20, 2010. The acquired assets and assumed liabilities were measured at estimated fair values, as required by Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) 805, Business Combinations, formerly FASB Statement No. 141 (revised 2007). Management made significant estimates and exercised significant judgment in accounting for the acquisition. Management judgmentally measured loan fair values based on loan file reviews (including borrower financial statements and tax returns), appraised collateral values, expected cash flows, and historical loss factors. Repossessed loan collateral was primarily valued based upon appraised collateral values. The Bank also recorded an identifiable intangible asset representing the value of the core deposit customer base of Sonoma based on Management’s evaluation of the cost of such deposits relative to alternative funding sources. In determining the value of the identifiable intangible asset, Management used significant estimates including average lives of depository accounts, future interest rate levels, the cost of servicing various depository products, FDIC assessment rates and other significant estimates. Management used quoted market prices to determine the fair value of investment securities and FHLB advances.

The Bank acquired assets and assumed liabilities of the former County Bank (“County”) on February 6, 2009 from the Federal Deposit Insurance Corporation (“FDIC”). The acquired assets and assumed liabilities of County were measured at estimated fair values, as required by the acquisition method of accounting for business combinations (FASB ASC 805). Management made significant estimates and exercised significant judgment in accounting for the acquisition of County. Management judgmentally assigned risk ratings to loans. The assigned risk ratings, appraised collateral values, expected cash flows, current interest rates, and statistically derived loss factors were used to measure fair values for loans. Repossessed loan collateral was primarily valued based upon appraised collateral values. Due to the loss-sharing agreements with the FDIC, the Bank recorded a receivable from the FDIC equal to 80 percent of the loss estimates embedded in the fair values of loans and repossessed loan collateral. The Bank also recorded an identifiable intangible asset representing the value of the core deposit customer base of County based on an appraisal performed by an independent third party. In determining the value of the identifiable intangible asset, the third-party appraiser used significant estimates including average lives of depository accounts, future interest rate levels, the cost of servicing various depository products, and other significant estimates. Management used quoted market prices to determine the fair value of investment securities, FHLB advances and other borrowings.

The acquired assets of Sonoma include loans which are not indemnified by the FDIC. The acquired loans of County are indemnified under loss-sharing agreements with the FDIC. Pursuant to acquisition accounting, the loans in each business combination were measured at their estimated fair value at the respective acquisition date. This method of measuring the carrying value of purchased loans differs from loans originated by the Company, and as such, the Company identifies purchased loans not indemnified by the FDIC as “Purchased Non-covered Loans” and purchased loans indemnified by the FDIC as “Purchased Covered Loans.” Loans originated by the Company are measured at the principal amount outstanding, net of unearned discount and unamortized deferred fees and costs. These loans are identified as “Originated Loans.”

Consolidation, Policy [Policy Text Block]

Principles of Consolidation. The consolidated financial statements include the accounts of the Company and all the Company’s subsidiaries. Significant intercompany transactions have been eliminated in consolidation. The Company does not maintain or conduct transactions with any unconsolidated special purpose entities.

Cash and Cash Equivalents, Policy [Policy Text Block]

Cash Equivalents. Cash equivalents include Due From Banks balances and Federal Funds Sold which are both readily convertible to known amounts of cash and are generally 90 days or less from maturity at the time of initiation, presenting insignificant risk of changes in value due to interest rate changes.

Marketable Securities, Policy [Policy Text Block]

Securities. Investment securities consist of debt securities of the U.S. Treasury, government sponsored entities, states, counties, municipalities, corporations, mortgage-backed securities, asset-backed securities and equity securities. Securities transactions are recorded on a trade date basis. The Company classifies its debt and marketable equity securities in one of three categories: trading, available for sale or held to maturity. Trading securities are bought and held principally for the purpose of selling them in the near term. Trading securities are recorded at fair value with unrealized gains and losses included in earnings. Held to maturity securities are those debt securities which the Company has the ability and intent to hold until maturity. Held to maturity securities are recorded at cost, adjusted for the amortization of premiums or accretion of discounts. Securities not included in trading or held to maturity are classified as available for sale. Available for sale securities are recorded at fair value. Unrealized gains and losses, net of the related tax effect, on available for sale securities are included in other comprehensive income.

A decline in the market value of any available for sale or held to maturity security below cost that is deemed other than temporary results in a charge to earnings and the establishment of a new cost basis for the security. Unrealized investment securities losses are evaluated at least quarterly to determine whether such declines in value should be considered “other than temporary” and therefore be subject to immediate loss recognition in income. Although these evaluations involve significant judgment, an unrealized loss in the fair value of a debt security is generally deemed to be temporary when the fair value of the security is below the carrying value primarily due to changes in risk-free interest rates, there has not been significant deterioration in the financial condition of the issuer, and the Company does not intend to sell or be required to sell the securities before recovery of its amortized cost. An unrealized loss in the value of an equity security is generally considered temporary when the fair value of the security declined primarily due to current market conditions and not deterioration in the financial condition of the issuer, the Company expects the fair value of the security to recover in the near term and the Company does not intend to sell or be required to sell the securities before recovery of its amortized cost. Other factors that may be considered in determining whether a decline in the value of either a debt or an equity security is “other than temporary” include ratings by recognized rating agencies, actions of commercial banks or other lenders relative to the continued extension of credit facilities to the issuer of the security, the financial condition, capital strength and near-term prospects of the issuer, and recommendations of investment advisors or market analysts.

Purchase premiums are amortized and purchase discounts are accreted over the estimated life of the related investment security as an adjustment to yield using the effective interest method. Unamortized premiums, unaccreted discounts, and early payment premiums are recognized as a component of gain or loss on sale upon disposition of the related security. Interest and dividend income are recognized when earned. Realized gains and losses from the sale of available for sale securities are included in earnings using the specific identification method.

Cost Method Investments, Policy [Policy Text Block]

Nonmarketable Equity Securities. Nonmarketable equity securities include securities that are not publicly traded, such as Visa Class B common stock, and securities acquired for various purposes, such as to meet regulatory requirements (for example, Federal Home Loan Bank and Federal Reserve Bank stock, which are restricted). These securities are accounted for under the cost method and are included in other assets. The Company reviews those assets accounted for under the cost method at least quarterly for possible declines in value that are considered “other than temporary”. The Company’s review typically includes an analysis of the facts and circumstances of each investment, the expectations for the investment’s cash flows and capital needs, the viability of its business model and exit strategy. The asset value is reduced when a decline in value is considered to be other than temporary. The Company recognizes the estimated loss in noninterest income.

Finance, Loans and Leases Receivable, Policy [Policy Text Block]

Loans. Loans are stated at the principal amount outstanding, net of unearned discount and unamortized deferred fees and costs. Interest is accrued daily on the outstanding principal balances. Loans which are more than 90 days delinquent with respect to interest or principal, unless they are well secured and in the process of collection, and other loans on which full recovery of principal or interest is in doubt, are placed on nonaccrual status. Interest previously accrued on loans placed on nonaccrual status is charged against interest income. In addition, some loans secured by real estate with temporarily impaired values and commercial loans to borrowers experiencing financial difficulties are placed on nonaccrual status (“performing nonaccrual loans”) even though the borrowers continue to repay the loans as scheduled. When the ability to fully collect nonaccrual loan principal is in doubt, payments received are applied against the principal balance of the loans until such time as full collection of the remaining recorded balance is expected. Any additional interest payments received after that time are recorded as interest income on a cash basis. Performing nonaccrual loans are reinstated to accrual status when improvements in credit quality eliminate the doubt as to the full collectability of both interest and principal. Certain consumer loans or auto receivables are charged to the allowance for credit losses when they become 120 days past due. The Company recognizes a loan as impaired when, based on current information and events, it is probable that it will be unable to collect both the contractual interest and principal payments as scheduled in the loan agreement. Income recognition on impaired loans conforms to that used on nonaccrual loans. In certain circumstances, the Company might agree to restructured loan terms with borrowers experiencing financial difficulties; such restructured loans are evaluated under ASC 310-40, “Troubled Debt Restructurings by Creditors.” In general, a restructuring constitutes a troubled debt restructuring when the Company, for reasons related to a borrower’s financial difficulties, grants a concession to the borrower it would not otherwise consider. Loans are evaluated on an individual basis. The Company follows its general nonaccrual policy for troubled debt restructurings. Performing troubled debt restructurings are reinstated to accrual status when improvements in credit quality eliminate the doubt as to full collectability of both principal and interest.

Nonrefundable fees and certain costs associated with originating or acquiring loans are deferred and amortized as an adjustment to interest income over the contractual loan lives. Upon prepayment, unamortized loan fees, net of costs, are immediately recognized in interest income. Other fees, including those collected upon principal prepayments, are included in interest income when received. Loans held for sale are identified upon origination and are reported at the lower of cost or market value on an aggregate loan basis.

Purchased Loans. Purchased loans are recorded at estimated fair value on the date of purchase. Impaired purchased loans are accounted for under FASB ASC 310-30, Loans and Debt Securities with Deteriorated Credit Quality, when the loans have evidence of credit deterioration since origination and it is probable at the date of acquisition that the Company will not collect all contractually required principal and interest payments. Evidence of credit quality deterioration as of the purchase date may include attributes such as past due and nonaccural status. Generally, purchased loans that meet the Company’s definition for nonaccrual status fall within the scope of FASB ASC 310-30. The difference between contractually required payments at acquisition and the cash flows expected to be collected at acquisition is referred to as the nonaccretable difference. Subsequent decreases to the expected cash flows will generally result in a provision for loan losses. Subsequent increases in cash flows result in a reversal of the provision for loan losses to the extent of prior charges, or a reclassification of the difference from nonaccretable to accretable with a positive impact on interest income. Any excess of expected cash flows over the estimated fair value is referred to as the accretable yield and is recognized into interest income over the remaining life of the loan when there is a reasonable expectation about the amount and timing of such cash flows. Further, the Company elected to analogize to ASC 310-30 and account for all other loans that had a discount due in part to credit not within the scope of ASC 310-30 using the same methodology.

Covered Loans. Loans covered under loss-sharing or similar credit protection agreements with the FDIC are reported in loans exclusive of the expected reimbursement cash flows from the FDIC. Covered loans are initially recorded at fair value at the acquisition date. Subsequent decreases in the amount expected to be collected results in a provision for loan losses and a corresponding increase in the estimated FDIC reimbursement, with the estimated net loss impacting earnings. Interest previously accrued on covered loans placed on nonaccrual status is charged against interest income, net of estimated FDIC reimbursements of such accrued interest. The FDIC reimburses the Company up to 80% of 90 days interest on covered loans.

Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block]

Allowance for Credit Losses. The allowance for credit losses is established through provisions for credit losses charged to income. Losses on loans, including impaired loans, are charged to the allowance for loan losses when all or a portion of the recorded amount of a loan is deemed to be uncollectible. Recoveries of loans previously charged off are credited to the allowance when realized. The Company’s allowance for credit losses is maintained at a level considered adequate to provide for losses that can be estimated based upon specific and general conditions. These include conditions unique to individual borrowers, as well as overall credit loss experience, the amount of past due, nonperforming and classified loans, recommendations of regulatory authorities, prevailing economic conditions, FDIC loss-sharing or similar credit protection agreements and other factors. A portion of the allowance is specifically allocated to impaired loans whose full collectability is uncertain. Such allocations are determined by Management based on loan-by-loan analyses. A second allocation is based in part on quantitative analyses of historical credit loss experience, in which criticized and classified loan balances identified through an internal loan review process are analyzed using a statistical model to determine standard loss rates. The results of this analysis are applied to current criticized and classified loan balances to allocate the reserve to the respective commercial, commercial real estate, and construction segments of the loan portfolio. In addition, residential real estate and consumer loans which have similar characteristics and are not usually criticized using regulatory guidelines are analyzed and reserves established based on the historical loss rates and delinquency trends, grouped by the number of days the payments on these loans are delinquent. Last, allocations are made to non-criticized and non-classified commercial, commercial real estate and construction loans based on historical loss rates. The remainder of the reserve is considered to be unallocated. The unallocated allowance is established to provide for probable losses that have been incurred as of the reporting date but not reflected in the allocated allowance. It addresses additional qualitative factors consistent with Management’s analysis of the level of risks inherent in the loan portfolio, which are related to the risks of the Company’s general lending activity. Included in the unallocated allowance is the risk of losses that are attributable to national or local economic or industry trends which have occurred but have not yet been recognized in past loan charge-off history (external factors). The external factors evaluated by the Company include: economic and business conditions, external competitive issues, and other factors. Also included in the unallocated allowance is the risk of losses that are attributable to general attributes of the Company’s loan portfolio and credit administration (internal factors). The internal factors evaluated by the Company include: loan review system, adequacy of lending Management and staff, loan policies and procedures, problem loan trends, concentrations of credit, and other factors. By their nature, these risks are not readily allocable to any specific category in a statistically meaningful manner and are difficult to quantify with a specific number.

Off-Balance-Sheet Credit Exposure, Policy [Policy Text Block]

Liability for Off-Balance Sheet Credit Exposures. A liability for off-balance sheet credit exposures is established through expense recognition. Off-balance sheet credit exposures relate to letters of credit and unfunded loan commitments for commercial and construction loans. Historical credit loss factors for commercial and construction loans are applied to the amount of these off-balance sheet credit exposures to estimate inherent losses.

Loans and Leases Receivable, Real Estate Acquired Through Foreclosure, Policy [Policy Text Block]

Other Real Estate Owned. Other real estate owned is comprised of property acquired through foreclosure proceedings, acceptances of deeds-in-lieu of foreclosure and, if applicable, vacated bank properties. Losses recognized at the time of acquiring property in full or partial satisfaction of debt are charged against the allowance for credit losses. Other real estate owned is recorded at the lower of the related loan carrying value or fair value of the collateral, generally based upon an independent property appraisal, less estimated disposition costs. Subsequently, other real estate owned is valued at the lower of the amount recorded at the date acquired or the then current fair value less estimated disposition costs. Subsequent losses incurred due to any decline in annual independent property appraisals are recognized as noninterest expense. Routine holding costs, such as property taxes, insurance and maintenance, and losses from sales and dispositions, are recognized as noninterest expense.

Covered Other Real Estate Owned. Other real estate owned covered under loss-sharing agreements with the FDIC is reported exclusive of expected reimbursement cash flows from the FDIC. Upon transferring covered loan collateral to covered other real estate owned status, acquisition date fair value discounts on the related loans are also transferred to covered other real estate owned. Fair value adjustments on covered other real estate owned result in a reduction of the covered other real estate carrying amount and a corresponding increase in the estimated FDIC reimbursement, with the estimated net loss charged against earnings.

Property, Plant and Equipment, Policy [Policy Text Block]

Premises and Equipment. Premises and equipment are stated at cost, less accumulated depreciation and amortization. Depreciation is computed substantially on the straight-line method over the estimated useful life of each type of asset. Estimated useful lives of premises and equipment range from 20 to 50 years and from 3 to 20 years, respectively. Leasehold improvements are amortized over the terms of the lease or their estimated useful life, whichever is shorter.

Goodwill and Intangible Assets, Policy [Policy Text Block]

Intangible Assets. Intangible assets are comprised of goodwill, core deposit intangibles and other identifiable intangibles acquired in business combinations. Intangible assets with definite useful lives are amortized on an accelerated basis over their respective estimated useful lives not exceeding 15 years. If an event occurs that indicates the carrying amount of an intangible asset may not be recoverable, Management reviews the asset for impairment. Any goodwill and any intangible asset acquired in a purchase business combination determined to have an indefinite useful life is not amortized, but is evaluated for impairment annually. The Company has the option to first assess qualitative factors to determine the likelihood of impairment pursuant to FASB ASU 2011-08, Testing for Goodwill Impairment. Although the Company has to the option to first assess qualitative factors when determining if impairment exists, the Company has opted to perform a quantitative analysis to determine if an impairment exists.

Impairment Of Long Lived Assets [Policy Text Block]

Impairment of Long-Lived Assets. The Company reviews its long-lived and certain intangible assets for impairment whenever events or changes indicate that the carrying amount of an asset may not be recoverable. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets. Assets to be disposed of are reported at the lower of the carrying amount or fair value less costs to sell.

Income Tax, Policy [Policy Text Block]

Income Taxes. The Company and its subsidiaries file consolidated tax returns. The Company accounts for income taxes in accordance with FASB ASC 740, Income Taxes, resulting in two components of income tax expense: current and deferred. Current income tax expense approximates taxes to be paid or refunded for the current period. The Company determines deferred income taxes using the balance sheet method. Under this method, the net deferred tax asset or liability is based on the tax effects of the differences between the book and tax bases of assets and liabilities, and recognizes enacted changes in tax rates and laws in the period in which they occur. Deferred income tax expense results from changes in deferred tax assets and liabilities between periods. Deferred tax assets are recognized subject to Management’s judgment that realization is more likely than not. A tax position that meets the more likely than not recognition threshold is measured to determine the amount of benefit to recognize. The tax position is measured at the largest amount of benefit that is greater than fifty percent likely of being realized upon settlement. Interest and penalties are recognized as a component of income tax expense.

Derivatives, Policy [Policy Text Block]

Derivative Instruments and Hedging Activities. The Company’s accounting policy for derivative instruments requires the Company to recognize those items as assets or liabilities in the statement of financial position and measure them at fair value. Hybrid financial instruments are single financial instruments that contain an embedded derivative. The Company’s accounting policy is to record certain hybrid financial instruments at fair value without separating the embedded derivative.

Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]

Stock Options. The Company applies FASB ASC 718 – Compensation – Stock Compensation, to account for stock based awards granted to employees using the fair value method. The Company recognizes compensation expense for restricted performance share grants over the relevant attribution period. Restricted performance share grants have no exercise price, therefore, the intrinsic value is measured using an estimated per share price at the vesting date for each restricted performance share. The estimated per share price is adjusted during the attribution period to reflect actual stock price performance. The Company’s obligation for unvested outstanding restricted performance share grants is classified as a liability until the vesting date due to a cash settlement feature, at which time the issued shares become classified as shareholders’ equity.

Extinguishment Of Debt [Policy Text Block]

Extinguishment of Debt. Gains and losses, including fees, incurred in connection with the early extinguishment of debt are charged to current earnings as reductions in noninterest income.

Postemployment Benefit Plans, Policy [Policy Text Block]

Postretirement Benefits. The Company uses an actuarial-based accrual method of accounting for post-retirement benefits.

Fiduciary [Policy Text Block]

Other. Securities and other property held by the Bank in a fiduciary or agency capacity are not included in the financial statements

since such items are not assets of the Company or its subsidiaries.

New Accounting Pronouncements, Policy [Policy Text Block]

Recently Adopted Accounting Pronouncements

In 2012, the Company adopted the following new accounting guidance:

FASB ASU 2011-03, Reconsideration of Effective Control for Repurchase Agreements, was issued April 2011 addressing the accounting for repurchase agreements and other agreements that both entitle and obligate a transferor to repurchase or redeem financial assets before their maturity. The amendments remove from the assessment of effective control (1) the criterion requiring the transferor to have the ability to repurchase or redeem the financial assets on substantially the agreed terms, even in the event of default by the transferee, and (2) the collateral maintenance implementation guidance related to that criterion. The Company adopted the provisions of the Update in the first quarter of 2012 with prospective application to new transactions or existing transactions modified on or after January 1, 2012. The adoption of the Update did not have a material effect on the Company’s financial statements at the date of adoption.

FASB ASU 2011-04, Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRSs, was issued May 2011 as a result of the FASB and International Accounting Standards Board’s (IASB) goal to develop common requirements for measuring fair value and for disclosing information about fair value measurements in accordance with U.S. generally accepted accounting principles and International Financial Reporting Standards. The Company adopted the provisions of the Update in the first quarter of 2012 with prospective application, resulting in expanded fair value disclosure. The adoption of the Update did not have a material effect on the Company’s financial statements at the date of adoption.

FASB ASU 2011-05, Presentation of Comprehensive Income, was issued June 2011 requiring that all changes in stockholders’ equity be presented either in a single continuous statement of comprehensive income or in two separate but consecutive statements. This Update also requires that reclassification adjustments for items that are reclassified from other comprehensive income to net income be presented on the face of the financial statements. The Company adopted the provisions of the Update in the first quarter of 2012 with retrospective application, resulting in the addition of a new financial statement titled “Consolidated Statements of Comprehensive Income”.

FASB ASU 2011-12, Deferral of the Effective Date for Amendments to the Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income in Accounting Standards Update No. 2011-05, was issued December 2011 updating and superseding certain pending paragraphs relating to the presentation on the face of the financial statements the effects of reclassifications out of accumulated other comprehensive income on the components of net income and other comprehensive income. This Update was effective concurrent with ASU 2011-05, Presentation of Comprehensive Income, and did not have a material effect on the Company’s financial statements at the date of adoption.

Recently Issued Accounting Standards

FASB ASU 2012-06, Subsequent Accounting for an Indemnification Asset Recognized at the Acquisition Date as a Result of a Government-Assisted Acquisition of a Financial Institution, was issued October 2012 to provide guidance for consistently measuring an indemnification asset subsequent to acquisition. Subsequent accounting for changes in the measurement of the indemnification asset should be on the same basis as a change in the assets subject to indemnification. Any amortization of changes in value is limited to the shorter of the contractual term of the indemnification agreement or the remaining life of the indemnified assets. The amendments are effective for fiscal years, and interim periods within those years, beginning on or after December 15, 2012, with early adoption permitted. The amendments will not have a material effect on the Company’s financial statements at the date of adoption since the Company’s historical accounting treatment is consistent with ASU 2012-06.