Statement of Financial Position [Abstract] Cash and due from banks Interest bearing due from banks Total cash and cash equivalents Cash and cash equivalents at beginning of year Cash and cash equivalents at end of period Securities available-for-sale, at fair value Available-for-sale securities, estimated fair value Total Securities available-for-sale Securities held-to-maturity, at amortized cost Held-to-maturity securities, amortized costs Loans, net of deferred fees and costs Allowance for loan and lease losses Allowance for loan and lease losses Loans and Leases Receivable, Allowance Net loans Net loans Premises and equipment, net Other real estate owned Life insurance Deferred tax asset Other assets Total assets Demand - noninterest bearing Demand - interest bearing Savings accounts Certificates of deposit Total deposits Federal Home Loan Bank of San Francisco borrowings Junior subordinated debentures Other liabilities Total liabilities Preferred stock, no par value, 2,000,000 shares authorized: Series B (liquidation preference $1,000 per share) issued and outstanding: 20,000 as of March 31, 2015 and December 31, 2014 Preferred stock, par value (in Dollars per share) Preferred stock, shares authorized Class of Stock [Axis] Series B Preferred Stock [Member] Preferred stock, liquidation preference (in Dollars per share) Preferred stock, shares issued Preferred stock, shares outstanding Common stock, no par value, 50,000,000 shares authorized; 17,081,780 issued; 13,336,978 outstanding as of March 31, 2015 and 13,294,777 outstanding as of December 31, 2014 Common stock, par value (in Dollars per share) Common stock, shares authorized Common stock, shares outstanding Common stock, shares issued Retained earnings Accumulated other comprehensive income (loss) Accumulated other comprehensive income (loss) Total shareholders’ equity Balance Balance Total liabilities and shareholders' equity Income Statement [Abstract] Interest and fees on loans Interest on taxable securities Interest on tax-exempt securities Interest on interest bearing due from banks Total interest income Interest on demand deposits Interest on savings deposits Interest on certificates of deposit Interest on other borrowings Total interest expense Interest Expense Net interest income Net interest income after provision for loan and lease losses Service charges on deposit accounts Payroll and benefit processing fees Earnings on cash surrender value - life insurance Gain (loss) on investment securities, net Net (gain) loss on sale of securities available-for-sale Other income Total noninterest income Salaries and related benefits Premise and equipment Write down of other real estate owned Impairment of Real Estate Federal Deposit Insurance Corporation insurance premium Data processing fees Professional service fees Deferred compensation Other expenses Total noninterest expense Income before provision for income taxes Provision for income taxes Net income Net income Net Income Less: Preferred dividends Income available to common shareholders Basic earnings per share (in Dollars per share) Basic (in Dollars per share) Average basic shares (in Shares) Weighted average number of common shares outstanding - basic Diluted earnings per share (in Dollars per share) Diluted (in Dollars per share) Average diluted shares (in Shares) Weighted average number of common shares outstanding - diluted Statement of Comprehensive Income [Abstract] Unrealized gains arising during the period Reclassification adjustments for net (gain) loss realized in earnings (net of tax expense (benefit) of $90 and $(101) for the three months ended March 31, 2015 and 2014 respectively. Reclassification adjustments for net (gain) loss realized in earnings, tax expense (benefit) Income tax expense related to unrealized gains Net change in unrealized gains Accretion of held-to-maturity other comprehensive income to municipal yield Net change in unrealized gains Unrealized losses arising during the period Reclassification adjustments for net gains realized in earnings (net of tax expense of $62 for the three months ended March 31, 2014) Reclassification adjustments for net gains realized in earnings, tax expense Income tax benefit related to unrealized losses Net change in unrealized losses Other comprehensive income Comprehensive income – Bank of Commerce Holdings Comprehensive income Statement of Stockholders' Equity [Abstract] Balance (in Shares) Balance (in Shares) Other comprehensive income (loss) Comprehensive income Preferred stock dividend Repurchase of common stock Repurchase of common stock (in Shares) Common cash dividend Common cash dividend Common stock issued under employee plans and related tax benefit Common stock issued under employee plans and related tax benefit (in Shares) Award Type [Axis] Employee Stock Option [Member] Compensation expense Restricted Stock [Member] Equity Components [Axis] Preferred Stock [Member] Common Stock [Member] Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) [Member] Statement of Cash Flows [Abstract] Provision for depreciation and amortization Compensation expense associated with stock options Compensation expense associated with restricted stock Amortization of investment premiums and accretion of discounts, net Amortization of held-to-maturity fair value adjustment Write down of fixed assets Write down of other real estate owned (Gain) on sale of other real estate owned Gains (Losses) on Sales of Other Real Estate Increase in cash surrender value of life insurance Increase in deferred compensation Increase in deferred loan costs Decrease in other assets Decrease in other liabilities Net cash provided by operating activities Proceeds from maturities and payments of available-for-sale securities Proceeds from sale of available-for-sale securities Proceeds from sales of securities Purchases of available-for-sale securities Proceeds from maturities and payments of held-to-maturity securities Purchases of held-to-maturity securities Cash paid for low income housing investments Net redemption of Federal Home Loan Bank of San Francisco stock Loan originations, net of principal repayments Purchase of loan pools Purchase of premises and equipment, net Proceeds from the sale of other real estate owned Proceeds from settlement of note to former mortgage subsidiary Cash received Proceeds from Collection of Notes Receivable Net cash (used) provided by investing activities Net decrease in demand deposits and savings accounts Net increase in certificates of deposit Advances on term debt Repayment of term debt Proceeds from stock options exercised Stock issued under employee plans Repurchase of common stock Cash dividends paid on preferred stock Cash dividends paid on common stock Net cash (used) provided by financing activities Net (decrease) increase in cash and cash equivalents Income taxes Interest Transfer of loans to other real estate owned Changes in unrealized gain on investment securities available-for-sale Changes in net deferred tax asset related to changes in unrealized gain on investment securities available-for-sale Changes in accumulated other comprehensive income due to changes in unrealized gain on investment securities available-for-sale Changes in unrealized (loss) on derivatives Changes in net deferred tax asset related to changes in unrealized loss on derivatives Changes in accumulated other comprehensive income due to changes in unrealized loss on derivatives Reclassification of earnings from gains on derivatives Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Changes in net deferred tax asset related to reclassification of earnings from gains on derivatives Changes in accumulated other comprehensive income due to reclassification of earnings from gain on derivatives Accretion of held-to-maturity from other comprehensive income to interest income Changes in deferred tax related to accretion of held-to-maturity investment securities Changes in accumulated other comprehensive income due to accretion of held-to-maturity investment securities Dividend payable Accounting Policies [Abstract] New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Note Receivable [Abstract] Details of Closing Transaction [Abstract] Net proceeds received Total assets derecognized Loss on settlement of the note Loss On Settlement Of Note Receivable Earnings Per Share [Abstract] Basic and Diluted EPS [Abstract] Net income (in Dollars) Preferred cash dividends (in Dollars) Net income available to common shareholders (in Dollars) Effect of potentially dilutive common shares (1) Antidilutive Securities [Axis] Equity Option [Member] Anti-dilutive options not included in earnings per share calculation