Bank of Marin Bancorp (BMRC) 10-K 11 Mar 16 2015 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Feb. 29, 2016	Jun. 30, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	Bank of Marin Bancorp
Entity Central Index Key	1,403,475
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 293
Entity Common Stock, Shares Outstanding		6,078,363
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015

CONSOLIDATED STATEMENTS OF COND

CONSOLIDATED STATEMENTS OF CONDITION - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 26,343	$ 41,367
Investment securities
Held-to-maturity, at amortized cost	69,637	116,437
Available-for-sale (at fair value; amortized cost $417,410 and $199,045 at December 31, 2015 and 2014, respectively)	417,787	200,848
Total investment securities	487,424	317,285
Loans, net of allowance for loan losses of $14,999 and $15,099 at December 31, 2015 and 2014, respectively	1,436,229	1,348,252
Bank premises and equipment, net	9,305	9,859
Goodwill	6,436	6,436
Core deposit intangible	3,113	3,732
Interest receivable and other assets	62,284	60,199
Total assets	2,031,134	1,787,130
Deposits
Non-interest bearing	770,087	670,890
Interest bearing
Transaction accounts	114,277	93,758
Savings accounts	141,316	133,714
Money market accounts	541,089	503,543
Time accounts	161,457	149,714
Total deposits	1,728,226	1,551,619
Federal Home Loan Bank (FHLB) borrowings	67,000	15,000
Subordinated debentures	5,395	5,185
Interest payable and other liabilities	16,040	15,300
Total liabilities	1,816,661	1,587,104
Stockholders' Equity
Preferred stock, no par value, Authorized - 5,000,000 shares, none issued	0	0
Common stock, no par value, Authorized - 15,000,000 shares; Issued and outstanding - 6,068,543 and 5,939,482 at December 31, 2015 and 2014, respectively	84,727	82,436
Retained earnings	129,553	116,502
Accumulated other comprehensive income, net	193	1,088
Total stockholders' equity	214,473	200,026
Total liabilities and stockholders' equity	$ 2,031,134	$ 1,787,130

CONSOLIDATED STATEMENTS OF CON3

CONSOLIDATED STATEMENTS OF CONDITION (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Investment Securities
Available for sale, amortized cost	$ 417,410	$ 199,045
Loans, allowance for loan losses	$ 14,999	$ 15,099
Stockholders' Equity
Preferred stock, no par value (in dollars per share)	$ 0	$ 0
Preferred stock, authorized (in shares)	5,000,000	5,000,000
Preferred stock, issued, (in shares)	0	0
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, authorized (in shares)	15,000,000	15,000,000
Common stock, issued (in shares)	6,068,543	5,939,482
Common stock, outstanding (in shares)	6,068,543	5,939,482

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest income
Interest and fees on loans	$ 61,754	$ 64,823	$ 54,408
Interest on investment securities
Securities of U.S. government agencies	4,709	4,502	2,573
Obligations of state and political subdivisions	2,155	2,273	2,214
Corporate debt securities and other	685	1,031	1,245
Interest on federal funds sold and short-term investments	135	161	120
Total interest income	69,438	72,790	60,560
Interest expense
Interest on interest bearing transaction accounts	115	99	52
Interest on savings accounts	51	46	35
Interest on money market accounts	495	550	419
Interest on time accounts	853	917	922
Interest on FHLB and overnight borrowings	317	315	322
Interest on subordinated debentures	420	422	35
Total interest expense	2,251	2,349	1,785
Net interest income	67,187	70,441	58,775
Provision for loan losses	500	750	540
Net interest income after provision for loan losses	66,687	69,691	58,235
Non-interest income
Service charges on deposit accounts	1,979	2,167	2,062
Wealth Management and Trust Services	2,391	2,309	2,162
Debit card interchange fees	1,445	1,378	1,104
Merchant interchange fees	545	803	822
Earnings on bank-owned life insurance	814	841	954
Dividends on FHLB stock	1,003	563	259
Gains (losses) on investment securities, net	79	80	(1)
Other income	937	900	704
Total non-interest income	9,193	9,041	8,066
Non-interest expense
Salaries and related benefits	25,764	25,005	21,974
Occupancy and equipment	5,498	5,470	4,347
Depreciation and amortization	1,968	1,585	1,395
Federal Deposit Insurance Corporation insurance	997	1,032	921
Data processing	3,318	3,665	5,334
Professional services	2,121	2,230	2,985
Directors' expense	826	628	537
Information technology	736	675	513
(Reversal of) provision for losses on off-balance sheet commitments	(263)	334	112
Other expense	5,984	6,639	5,974
Total non-interest expense	46,949	47,263	44,092
Income before provision for income taxes	28,931	31,469	22,209
Provision for income taxes	10,490	11,698	7,939
Net income	$ 18,441	$ 19,771	$ 14,270
Net income per common share:
Basic (in dollars per share)	$ 3.09	$ 3.35	$ 2.62
Diluted (in dollars per share)	$ 3.04	$ 3.29	$ 2.57
Weighted-average shares used to compute net income per common share:
Basic (in shares)	5,966	5,893	5,457
Diluted (in shares)	6,065	6,006	5,558
Dividends declared per common share (in dollars per share)	$ 0.90	$ 0.80	$ 0.73
Comprehensive income
Net income	$ 18,441	$ 19,771	$ 14,270
Other comprehensive income
Change in net unrealized (loss) gain on available-for-sale securities	(1,420)	2,939	(4,720)
Reclassification adjustment for (gain) loss on available-for-sale securities included in net income	(6)	24	18
Net change in unrealized (loss) gain on available-for-sale securities, before tax	(1,426)	2,963	(4,702)
Deferred tax (benefit) expense	(531)	1,203	(1,975)
Other comprehensive (loss) income, net of tax	(895)	1,760	(2,727)
Comprehensive income	$ 17,546	$ 21,531	$ 11,543

CONSOLIDATED STATEMENT OF CHANG

CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss), Net of Taxes
Balance (in shares) at Dec. 31, 2012		5,389,210
Balance at Dec. 31, 2012	$ 151,792	$ 58,573	$ 91,164	$ 2,055
Net income	14,270	0	14,270	0
Other comprehensive income (loss)	$ (2,727)	$ 0	0	(2,727)
Stock options exercised (in shares)	71,237	71,237
Stock options exercised	$ 2,218	$ 2,218	0	0
Excess tax benefit - stock-based compensation	125	$ 125	0	0
Stock issued under employee stock purchase plan (in shares)		870
Stock issued under employee stock purchase plan	34	$ 34	0	0
Restricted stock granted (in shares)		11,850
Restricted stock granted	0	$ 0	0	0
Restricted stock forfeited/cancelled (in shares)		(3,998)
Restricted stock forfeited/cancelled	0	$ 0	0	0
Stock-based compensation - stock options	175	175	0	0
Stock-based compensation - restricted stock	228	228	0	0
Cash dividends paid on common stock	(3,970)	$ 0	(3,970)	0
Stock purchased by directors under director stock plan (in shares)		160
Stock purchased by directors under director stock plan	6	$ 6	0	0
Stock issued in payment of director fees (in shares)		5,619
Stock issued in payment of director fees	222	$ 222	0	0
Stock issued to NorCal Community Bancorp shareholders (in shares)		402,576
Stock issued to NorCal Community Bancorp shareholders	18,514	$ 18,514	0	0
Balance (in shares) at Dec. 31, 2013		5,877,524
Balance at Dec. 31, 2013	180,887	$ 80,095	101,464	(672)
Net income	19,771	0	19,771	0
Other comprehensive income (loss)	$ 1,760	$ 0	0	1,760
Stock options exercised (in shares)	49,415	49,415
Stock options exercised	$ 1,452	$ 1,452	0	0
Excess tax benefit - stock-based compensation	172	$ 172	0	0
Stock issued under employee stock purchase plan (in shares)		521
Stock issued under employee stock purchase plan	23	$ 23	0	0
Restricted stock granted (in shares)		8,523
Restricted stock granted	0	$ 0	0	0
Restricted stock forfeited/cancelled (in shares)		(2,067)
Restricted stock forfeited/cancelled	0	$ 0	0	0
Stock-based compensation - stock options	200	200	0	0
Stock-based compensation - restricted stock	246	246	0	0
Cash dividends paid on common stock	(4,733)	$ 0	(4,733)	0
Stock purchased by directors under director stock plan (in shares)		260
Stock purchased by directors under director stock plan	12	$ 12	0	0
Stock issued in payment of director fees (in shares)		5,306
Stock issued in payment of director fees	236	$ 236	0	0
Stock issued to NorCal Community Bancorp shareholders	$ 0
Balance (in shares) at Dec. 31, 2014	5,939,482	5,939,482
Balance at Dec. 31, 2014	$ 200,026	$ 82,436	116,502	1,088
Net income	18,441	0	18,441	0
Other comprehensive income (loss)	$ (895)	$ 0	0	(895)
Stock options exercised (in shares)	37,071	37,071
Stock options exercised	$ 1,139	$ 1,139	0	0
Excess tax benefit - stock-based compensation	212	$ 212	0	0
Stock issued under employee stock purchase plan (in shares)		339
Stock issued under employee stock purchase plan	17	$ 17	0	0
Restricted stock granted (in shares)		15,970
Restricted stock granted	0	$ 0	0	0
Restricted stock forfeited/cancelled (in shares)		(450)
Restricted stock forfeited/cancelled	0	$ 0	0	0
Stock-based compensation - stock options	252	252	0	0
Stock-based compensation - restricted stock	384	384	0	0
Cash dividends paid on common stock	(5,390)	$ 0	(5,390)	0
Stock purchased by directors under director stock plan (in shares)		245
Stock purchased by directors under director stock plan	12	$ 12	0	0
Stock issued in payment of director fees (in shares)		5,295
Stock issued in payment of director fees	275	$ 275	0	0
Stock issued to NorCal Community Bancorp shareholders	$ 0
Stock issued from exercise of warrants (in shares)		70,591
Balance (in shares) at Dec. 31, 2015	6,068,543	6,068,543
Balance at Dec. 31, 2015	$ 214,473	$ 84,727	$ 129,553	$ 193

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Flows from Operating Activities:
Net income	$ 18,441	$ 19,771	$ 14,270
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	500	750	540
(Reversal of) provision for losses on off-balance sheet commitments	(263)	334	112
Compensation expense--common stock for director fees	274	270	215
Stock-based compensation expense	636	446	403
Excess tax benefits from exercised stock options	(187)	(118)	(96)
Amortization of core deposit intangible	619	771	69
Amortization of investment security premiums, net of accretion of discounts	2,825	2,759	3,004
Accretion of discount on acquired loans	(1,883)	(3,906)	(1,871)
Accretion of discount on subordinated debentures	210	216	19
Net amortization of deferred loan origination costs/fees	(281)	(463)	(793)
Write-down of other real estate owned	40	0	0
(Gain) loss on sale of investment securities	(79)	(93)	1
Other-than-temporary impairment on securities available-for-sale	0	13	0
Depreciation and amortization	1,968	1,585	1,395
(Gain) loss on sale of repossessed assets	0	0	(43)
Earnings on bank owned life insurance policies	(814)	(841)	(954)
Net change in operating assets and liabilities:
Interest receivable	(734)	(143)	(694)
Interest payable	(26)	(40)	28
Deferred rent and other rent-related expenses	(4)	160	338
Other assets	1,081	(184)	299
Other liabilities	1,359	(2,430)	4,959
Net cash provided by operating activities	23,682	18,857	21,201
Cash Flows from Investing Activities:
Purchase of held-to-maturity securities	(2,375)	0	0
Purchase of available-for-sale securities	(287,144)	(18,206)	(86,372)
Proceeds from sale of available-for-sale securities	2,099	2,436	7,973
Proceeds from sale of held-to-maturity securities	1,015	2,146	6,442
Proceeds from paydowns/maturities of held-to-maturity securities	47,181	16,793	8,570
Proceeds from paydowns/maturities of available-for-sale securities	64,839	46,371	36,332
Loans originated and principal collected, net	(88,123)	(88,872)	(23,087)
Purchase of bank owned life insurance policies	0	0	(1,421)
Purchase of premises and equipment	(1,418)	(2,334)	(958)
Proceeds from sale of repossessed assets	1,502	0	0
Proceeds from sale of repossessed assets	0	0	270
Cash acquired from acquisitions, net of cash paid	0	0	15,785
Purchase of Federal Home Loan Bank stock	(136)	(492)	(420)
Cash paid for low income housing investment	(718)	(494)	(62)
Net cash used in investing activities	(263,278)	(42,652)	(36,948)
Cash Flows from Financing Activities:
Net increase (decrease) in deposits	176,607	(35,483)	92,787
Proceeds from stock options exercised	1,139	1,452	2,218
Federal Home Loan Bank borrowings	(52,000)	0	0
Cash dividends paid on common stock	(5,390)	(4,733)	(3,970)
Proceeds from stock issued under employee and director stock purchase plans	29	35	40
Excess tax benefits from exercised stock options	187	118	96
Net cash provided (used in) by financing activities	224,572	(38,611)	91,171
Net (decrease) increase in cash and cash equivalents	(15,024)	(62,406)	75,424
Cash and cash equivalents at beginning of period	41,367	103,773	28,349
Cash and cash equivalents at end of period	26,343	41,367	103,773
Supplemental disclosure of cash flow items, non-cash investing and financing activities:
Cash paid in interest	2,066	2,185	1,740
Cash paid in income taxes	9,068	11,290	9,239
Supplemental disclosure of non-cash investing and financing activities:
Change in unrealized gain on available-for-sale securities	(1,426)	2,963	(4,702)
Loans transferred to repossessed assets	0	0	192
Stock issued in payment of director fees	275	236	222
Subscription in low income housing tax credit investment	1,023	1,000	1,000
Securities transferred from available-for-sale to held-to-maturity	0	14,297	0
Transfer of loan to loans held-for-sale at fair value	1,502	0	0
Acquisitions:
Fair value of assets acquired	0	0	280,917
Fair value of liabilities assumed	0	0	246,384
Stock issued to NorCal Community Bancorp shareholders	$ 0	$ 0	$ 18,514

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation : The consolidated financial statements include the accounts of Bank of Marin Bancorp (“Bancorp”), a bank holding company, and its wholly-owned bank subsidiary, Bank of Marin (the “Bank”), a California state-chartered commercial bank. References to “we,” “our,” “us” mean the holding company and the Bank that are consolidated for financial reporting purposes. All material intercompany transactions have been eliminated. We have evaluated subsequent events through the date of filing with the Securities and Exchange Commission (“SEC”) and have determined that there are no subsequent events that require additional recognition or disclosure. On November 29, 2013, we completed the merger of NorCal Community Bancorp ("NorCal"), parent company of Bank of Alameda, to enhance our market presence (the “NorCal Acquisition”). On the date of acquisition, Bancorp assumed ownership of NorCal Community Bancorp Trusts I and II, respectively (the "Trusts"), which were formed for the sole purpose of issuing trust preferred securities. Bancorp is not considered the primary beneficiary of the Trusts (variable interest entities), therefore the Trusts are not consolidated in our consolidated financial statements, but rather the subordinated debentures are shown as a liability on our consolidated statements of condition. Bancorp's investment in the common stock of the Trusts is accounted for under the equity method and is included in interest receivable and other assets on the consolidated statements of condition. Nature of Operations : Bancorp, headquartered in Novato, CA, conducts business primarily through its wholly-owned subsidiary, the Bank, which provides a wide range of financial services to customers, who are predominantly professionals, small and middle-market businesses, and individuals who work and/or reside in Marin, Sonoma, Napa, San Francisco and Alameda counties. Besides the headquarters office in Novato, CA, the Bank operates ten branches in Marin County, one in Napa County, one in San Francisco, five in Sonoma County and three in Alameda County. Our accounting and reporting policies conform to generally accepted accounting principles, general practice, and regulatory guidance within the banking industry. A summary of our significant policies follows. Cash and Cash Equivalents include cash, due from banks, federal funds sold and other short-term investments with maturity less than three months at the time of origination. Investment Securities are classified as "held-to-maturity," "trading securities" or "available-for-sale." Investments classified as held-to-maturity are those that we have the ability and intent to hold until maturity and are reported at cost, adjusted for the amortization or accretion of premiums or discounts. Investments held for resale in anticipation of short-term market movements are classified as trading securities and are reported at fair value, with unrealized gains and losses included in earnings. Investments that are neither held-to-maturity nor trading are classified as available-for-sale and are reported at fair value. Unrealized gains and losses for available-for-sale securities, net of related tax, are reported as a separate component of comprehensive income and included in stockholders' equity until realized. For discussion of our methodology in determining fair value, see Note 10. At each financial statement date, we assess whether declines in the fair value of held-to-maturity and available-for-sale securities below their costs are deemed to be other-than-temporary. We consider, among other things, (i) the length of time and the extent to which the fair value has been less than cost, (ii) the financial condition and near-term prospects of the issuer, and (iii) our intent and ability to retain the investment for a period of time sufficient to allow for any anticipated recovery in fair value. Evidence evaluated includes, but is not limited to, the remaining payment terms of the instrument and economic factors that are relevant to the collectability of the instrument, such as: current prepayment speeds, the current financial condition of the issuer(s), industry analyst reports, credit ratings, credit default rates, interest rate trends, the quality of any credit enhancement and the value of any underlying collateral. For each security in an unrealized loss position ("impaired security"), we assess whether we intend to sell the security or if it is more likely than not that we will be required to sell the security before recovery of its amortized cost basis. If we intend to sell the security or it is more likely than not we will be required to sell the security before recovery of its amortized cost basis, the entire difference between the investment’s amortized cost basis and its fair value at the balance sheet date is recognized against earnings. For impaired securities that are not intended for sale and will not be required to be sold prior to recovery of our amortized cost basis, we determine if the impairment has a credit loss component. For both held-to-maturity and available-for-sale securities, if the amount of cash flows expected to be collected are less than the amortized cost, an other-than-temporary impairment shall be considered to have occurred and the credit loss component is recognized against earnings as the difference between present value of the expected future cash flows and the amortized cost. In determining the present value of the expected cash flows, we discount the expected cash flows at the effective interest rate implicit in the security at the date of purchase. The remaining difference between the fair value and the amortized basis is deemed to be due to factors that are not credit related and is recognized in other comprehensive income, net of applicable taxes. For held-to-maturity securities, if there is no credit loss component, no impairment is recognized. The portion of other-than-temporary impairment recognized in other comprehensive income for credit impaired debt securities classified as held-to-maturity is accreted from other comprehensive income to the amortized cost of the debt security over the remaining life of the debt security in a prospective manner on the basis of the amount and timing of future estimated cash flows. Premiums and discounts are amortized or accreted over the life of the related security as an adjustment to yield using the effective interest method. Dividend and interest income are recognized when earned. Realized gains and losses on the sale of securities and credit losses related to other-than-temporary impairment on available-for-sale and held-to-maturity securities are included in non-interest income as gains (losses) on investment securities, net. The specific identification method is used to calculate realized gains and losses on sales of securities. Originated Loans are reported at the principal amount outstanding net of deferred fees (costs), charge-offs and the allowance for loan losses (“ALLL”). Interest income is accrued daily using the simple interest method. Loans are placed on non-accrual status when Management believes that there is doubt as to the collection of principal or interest, generally when they become contractually past due by ninety days or more with respect to principal or interest, except for loans that are well-secured and in the process of collection. When loans are placed on non-accrual status, any accrued but uncollected interest is reversed from current-period interest income. Non-accrual loans may be returned to accrual status when one of the following occurs: • The loan is brought current or after all principal and past due interest has been collected, and we are satisfied with the borrower's financial position and we are reasonably assured as to repayment. • The loan has become well secured and is in the process of collection. • We are satisfied with the borrower’s financial position, the obligor has resumed paying the full amount of the contractual interest and principal, the amounts contractually due are reasonably assured of repayment within a reasonable period, and there has been a sustained period of repayment performance (generally, six consecutive monthly payments), according to the modified terms for loans whose contractual terms have been restructured in a manner which grants a concession to a borrower experiencing financial difficulties (“troubled debt restructuring”). Loan origination fees and commitment fees, offset by certain direct loan origination costs, are deferred and amortized as yield adjustments over the contractual lives of the related loans. Loan Charge-Off Policy: For all loan types excluding overdraft accounts, we generally make a charge-off determination at or before 90 days past due. A collateral-dependent loan is partially charged down to the fair value of collateral securing it if: (1) it is deemed uncollectable, or (2) it has been classified as a loss by either our internal loan review process or external examiners. A non-collateral-dependent loan is partially charged down to its net realizable value under the same circumstances. For overdraft accounts, we generally charge them off when they exceed 60 days past due. Acquired Loans : From time to time, we acquire loans through business acquisitions. Acquired loans are recorded at their estimated fair values at acquisition date in accordance with ASC 805 Business Combinations , factoring in credit losses expected to be incurred over the life of the loan. Accordingly, an allowance for loan losses is not carried over or recorded for acquired loans as of the acquisition date. The process of calculating fair values of the acquired loans, including estimates of losses that are expected to be incurred over the estimated remaining lives of the loans at acquisition date and the ongoing updates to Management's expectation of future cash flows, requires significant subjective judgments and assumptions, particularly considering the economic environment. The economic environment and the lack of market liquidity and transparency are factors that have influenced, and may continue to affect, these assumptions and estimates. We estimated the fair value of acquired loans at the acquisition date based on a discounted cash flow methodology that considered factors including the type of loan and related collateral, risk classification, fixed or variable interest rate, term of loan, whether or not the loan was amortizing, and current discount rates. Loans, except for purchased credit impaired ("PCI") loans, were grouped together according to similar risk characteristics and treated in the aggregate when applying various valuation techniques. Expected cash flows incorporated our best estimate of key assumptions at the time, such as property values, default rates, loss severity and prepayment speeds. Discount rates were based on market rates for new originations of comparable loans, where available, and included adjustments for liquidity factors. To the extent comparable market rates were not readily available, a discount rate was derived based on the assumptions of market participants' cost of funds, servicing costs and return requirements for comparable risk assets. In either case, the discount rate did not include a factor for credit losses, as that had been considered in estimating the cash flows. The initial estimate of cash flows to be collected was derived from assumptions such as default rates, loss severities and prepayment speeds. We acquired some loans from business combinations with evidence of significant credit quality deterioration subsequent to their origination and for which it was probable, at acquisition, that we would be unable to collect all contractually required payments. Management applied significant subjective judgment in determining which loans were PCI loans. Evidence of credit quality deterioration as of the purchase date may include data such as past due and nonaccrual status, risk grades and charge-off history. Revolving credit agreements (e.g., home equity lines of credit and revolving commercial loans) where the borrower had revolving rights at acquisition date were not considered PCI loans because the timing and amount of cash flows cannot be reasonably estimated. According to the accounting guidance for PCI loans, the nonaccretable difference on the date of acquisition is defined as the difference between the contractually required payments and the cash flows expected to be collected, considering the result of prepayments, and is not recorded. The difference between the undiscounted expected cash flows and the fair value at acquisition date ("accretable difference") is accreted into interest income at a level yield of return over the remaining term of the loan, provided that the timing and amount of future cash flows is reasonably estimable. For purposes of accounting for the PCI loans from past business combinations, we elected not to apply the pooling method but to account for these loans individually. Disposals of loans, which may include sales of loans to third parties, receipt of payments in full by the borrower, or foreclosure of the collateral, result in removal of the loan from the PCI loan portfolio at its carrying amount. If a PCI loan pays off earlier than expected, a gain is recorded as interest income when the payoff amount exceeds the recorded investment. For acquired loans not considered credit impaired ("non-PCI"), we recognize the entire fair value discount accretion to interest income, based on contractual cash flows using an effective interest rate method for term loans, and on a straight line basis for revolving lines. When a non-PCI loan is placed on non-accrual status subsequent to acquisition, accretion stops until the loan is returned to accrual status. The level of accretion on non-PCI loans varies from period to period due to maturities and early pay-offs of these loans during the reporting periods. Subsequent to acquisition, if the probable and estimable losses for non-PCI loans exceed the amount of the remaining unaccreted discount, the excess is established as an allowance for loan losses. All acquired loans were acquired in acquisitions and do not represent loans purchased from third parties. For further information regarding our acquired loans, see Note 4. Allowance for Loan Losses is based upon estimates of loan losses and is maintained at a level considered adequate to provide for probable losses inherent in the loan portfolio. The allowance is increased by provisions for loan losses charged against earnings and reduced by charge-offs, net of recoveries. In periodic evaluations of the adequacy of the allowance balance, Management considers current economic conditions, known and inherent risks in the portfolio, adverse situations that may affect the borrower's ability to repay, the estimated value of any underlying collateral, our past loan loss experience and other factors. The ALLL is based on estimates, and ultimate losses may vary from current estimates. Our Board of Directors' Asset/Liability Management Committee (“ALCO”) reviews the adequacy of the ALLL at least quarterly. The overall allowance consists of 1) specific allowances for individually identified impaired loans ("ASC 310-10") and 2) general allowances for pools of loans ("ASC 450-20"), which incorporate changing qualitative and environmental factors (e.g., portfolio growth and trends, credit concentrations, economic and regulatory factors, etc.). The first component, specific allowances, results from the analysis of identified problem credits and the evaluation of sources of repayment including collateral, as applicable. Through Management's ongoing loan grading and credit monitoring process, individual loans are identified that have conditions indicating the borrower may be unable to pay all amounts due in accordance with the contractual terms. These loans are evaluated for impairment individually by Management. Management considers an originated loan to be impaired when it is probable we will be unable to collect all amounts due according to the contractual terms of the loan agreement. When the fair value of the impaired loan is less than the recorded investment in the loan, the difference is recorded as impairment through the establishment of a specific allowance. For loans determined to be impaired, the extent of the impairment is measured based on the present value of expected future cash flows discounted at the loan's effective interest rate at origination (for originated loans), based on the loan's observable market price, or based on the fair value of the collateral if the loan is collateral dependent or if foreclosure is imminent. Generally with problem credits that are collateral dependent, we obtain appraisals of the collateral at least annually. We may obtain appraisals more frequently if we believe the collateral value is subject to market volatility, if a specific event has occurred to the collateral, or if we believe foreclosure is imminent. The estimate of cash flows expected to be collected on PCI loans is updated each quarter and requires the continued use of key assumptions and estimates. We apply judgment to develop our estimate of cash flows given the current economic environment, changes in collateral values, loan workout plans, changing probability of default, loss severities and prepayments. If we have probable decreases in cash flows expected to be collected on PCI loans, specific allowances are established to account for credit deterioration subsequent to acquisition. The second component is an estimate of the probable inherent losses in each loan pool with similar risk characteristics. This analysis encompasses the entire loan portfolio excluding individually identified impaired loans and acquired loans whose purchase discount has not been fully accreted. Under our allowance model, loans are evaluated on a pool basis by loan segment which is further delineated by Federal regulatory reporting codes ("CALL codes"): • Loans secured by real estate: - 1-4 family residential construction loans - Other construction loans and all land development and other land loans - Secured by farmland (including residential and other improvements) - Revolving, open-end loans secured by 1-4 family residential properties and extended under lines of credit - Closed-end loans secured by 1-4 family residential properties, secured by first liens - Closed-end loans secured by 1-4 family residential properties, secured by junior liens - Secured by multifamily (5 or more) residential properties - Loans secured by owner-occupied non-farm nonresidential properties - Loans secured by other non-farm nonresidential properties • Loans to finance agricultural production and other loans to farmers • Commercial and industrial loans • Loans to individuals for household, family and other personal expenditures (i.e., consumer loans) • Other loans The model determines loan loss reserves by loan segment based on objective and subjective expected loss factors. Objective factors include an historical loss rate using a rolling twenty-quarter look-back, changes in the volume and nature of the loan portfolio, changes in credit quality metrics (past due loans, non-accrual loans, net charge-offs and adversely-graded loans), and the existence of credit concentrations. When a loan segment exceeds 100% of Tier 1 capital, additional reserves are provided due to credit concentration risk. Subjective factors include changes in the overall economic environment, legal and regulatory conditions, experience level of lending management and other relevant staff, uncertainties related to acquisitions, as well as the quality of our loan review process. The total amount allocated is determined by applying loss factors to outstanding loans by CALL code. For further information regarding the allowance for loan losses, see Note 4. Allowance for Losses on Off-Balance Sheet Commitments : We make commitments to extend credit to meet the financing needs of our customers in the form of loans or standby letters of credit. We are exposed to credit loss in the event that a decline in credit quality of the borrower leads to nonperformance. We record an allowance for losses on these off-balance sheet commitments based on an estimate of probabilities of these commitments being drawn upon according to our historical utilization experience on different types of commitments and expected loss severity. This allowance is included in interest payable and other liabilities on the consolidated statements of condition. Transfers of Financial Assets : We have entered into certain participation agreements with other organizations. We account for these transfers of financial assets as sales when control over the transferred financial assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets and liabilities have been isolated from us, (2) the transferee has the right to pledge or exchange the assets (or beneficial interests) it received, free of conditions that constrain it from taking advantage of that right, beyond a trivial benefit and (3) we do not maintain effective control over the transferred financial assets or third-party beneficial interests related to those transferred assets. No gain or loss has been recognized by us on the sale of these participation interests in 2015 , 2014 and 2013 . Premises and Equipment : Premises and equipment consist of leasehold improvements, furniture, fixtures, software and equipment and are stated at cost, less accumulated depreciation and amortization, which are calculated on a straight-line basis. Furniture and fixtures are depreciated over eight years and equipment is generally depreciated over three to twenty years. Leasehold improvements are amortized over the lesser of their estimated useful lives or the terms of the leases. When assets are sold or otherwise disposed of, the cost and related accumulated depreciation or amortization are removed from the accounts and any resulting gain or loss is recognized in income for the period. The cost of maintenance and repairs is charged to expense as incurred. Business Combinations : Business combinations are accounted for under the acquisition method of accounting in accordance with ASC 805, Business Combinations . Under the acquisition method the acquiring entity in a business combination recognizes the acquired assets and assumed liabilities at their estimated fair values as of the date of acquisition. Any excess of the purchase price over the fair value of net assets and other identifiable intangible assets acquired is recorded as goodwill. To the extent the fair value of net assets acquired, including other identifiable assets, exceed the purchase price, a bargain purchase gain is recognized. Assets acquired and liabilities assumed from contingencies must also be recognized at fair value, if the fair value can be determined during the measurement period. Results of operations of an acquired business are included in the statement of operations from the date of acquisition. Acquisition-related costs, including conversion and restructuring charges, are expensed as incurred. Goodwill and Other Intangible Assets : Goodwill is determined as the excess of the fair value of the consideration transferred, plus the fair value of any noncontrolling interests in the acquiree, over the fair value of the net assets acquired and liabilities assumed as of the acquisition date. Goodwill that arises from a business combination determined to have an indefinite useful life is not amortized, but is periodically evaluated for impairment at the reporting unit level, at least annually. Intangible assets with definite useful lives are amortized over their estimated useful lives to their estimated residual values. Core deposit intangible represents estimated future benefit of deposits related to an acquisition and is booked separately from the related deposits and is evaluated periodically for impairment. The core deposit intangible asset is amortized on an accelerated method over its estimated useful life of ten years. We make a qualitative assessment of whether it is more likely than not that the fair value of a reporting unit where goodwill is assigned is less than its carrying amount before applying a two-step goodwill impairment test. If we conclude that it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, we do not perform the two-step impairment test. Goodwill is tested for impairment on an interim basis if circumstances change or an event occurs between annual tests that would more likely than not reduce the fair value of the reporting unit below its carrying amount. The qualitative assessment includes adverse events or circumstances identified that could negatively affect the reporting units’ fair value as well as positive and mitigating events. Such indicators may include, among others, a significant change in legal factors or in the general business climate, significant change in our stock price and market capitalization, unanticipated competition, and an action or assessment by a regulator. Other Real Estate Owned ("OREO") : OREO is comprised of property acquired through foreclosure, in substance repossession or acceptance of deeds-in-lieu of foreclosure when the related loan receivable is de-recognized. OREO is recorded at fair value of the collateral less estimated costs to sell, establishing a new cost basis, and subsequently accounted for at the lower of cost or fair value less estimated costs to sell. Any shortfall of collateral value from the recorded investment of the related loan is recognized as loss at the time of foreclosure and is charged against the allowance for loan losses. Fair value of collateral is generally based on an independent appraisal of the property. Revenues and expenses associated with OREO, and subsequent adjustments to the fair value of the property and to the estimated costs of disposal, are realized and reported as a component of non-interest income and expense when incurred. Bank Owned Life Insurance : The Bank has purchased life insurance policies on certain key current and former officers. Bank owned life insurance ("BOLI") is recorded in interest receivable and other assets on the consolidated statements of condition at the amount that can be realized under the insurance contract at the period end, which is the cash surrender value adjusted for other charges or amounts due that are probable at settlement. Federal Home Loan Bank of San Francisco ("FHLB") Stock : The Bank is a member of the FHLB. Members are required to own a certain amount of stock based on the level of borrowings and other factors. Our investment in FHLB stock is carried at cost and is included as part of interest receivable and other assets on the consolidated statements of condition. We periodically evaluate FHLB stock for impairment based on ultimate recovery of par value. Both cash and stock dividends are reported as non-interest income. Investments in Low Income Housing Tax Credit Funds : We have invested in limited partnerships that were formed to develop and operate affordable housing projects for low or moderate income tenants throughout California. Our ownership in each limited partnership is less than two percent. In accordance with ASU No. 2014-01, Investments - Equity Method and Joint Ventures (Topic 323), we elected to account for the investments in qualified affordable housing tax credit funds using the proportional amortization method. Under the proportional amortization method, the initial cost of the investment is amortized in proportion to the tax credits and other tax benefits received and the net investment performance is recognized as part of income tax expense (benefit). Each of the partnerships must meet the regulatory minimum requirements for affordable housing for a minimum 15-year compliance period to fully utilize the tax credits. If the partnerships cease to qualify during the compliance period, the credit may be denied for any period in which the project is not in compliance and a portion of the credit previously taken is subject to recapture with interest. Employee Stock Ownership Plan (“ESOP”) : We recognize compensation cost of the ESOP contribution when funds become committed for the purchase of Bancorp's common shares into the ESOP in the year in which the employees render service entitling them to the contribution. If we contribute stock, the compensation cost is the fair value of the shares when they are committed to be released, i.e. when the number of shares becomes known. During 2015 , 2014 and 2013 , the Bank only made cash contributions to the ESOP without leveraging. Income Taxes : Income taxes reported in the consolidated financial statements are computed based on an asset and liability approach. We recognize the amount of taxes payable or refundable for the current year and we record deferred tax assets and liabilities for future tax consequences attributable to differences between the financial statement carrying amount of existing assets and liabilities and their respective tax bases using enacted tax rates in effect for the year in which the temporary differences are expected to reverse. We record net deferred tax assets to the extent it is more likely than not that they will be realized. In evaluating our ability to recover the deferred tax assets and the need to establish a valuation allowance against the deferred tax assets, Management considers all available positive and negative evidence, including scheduled reversals of deferred tax liabilities, projected future taxable income, and tax planning strategies. In projecting future taxable income, Management develops assumptions including the amount of future state and federal pretax operating income, the reversal of temporary differences, and the implementation of feasible and prudent tax planning strategies. These assumptions require significant judgment about the forecasts of future taxable income and are consistent with the plans and estimates being used to manage the underlying business. Bancorp files consolidated federal and combined state income tax returns. We recognize the financial statement effect of a tax position when it is more likely than not, based on the technical merits and all available evidence, that the position will be sustained upon examination, including the resolution through protests, appeals or litigation processes. For tax positions that meet the more-likely-than-not threshold, we measure and record the largest amount of tax benefit that is greater than fifty percent likely of being realized upon ultimate settlement with the taxing authority. The remainder of the benefits associated with tax positions taken is recorded as unrecognized tax benefits, along with any related interest and penalties. Interest and penalties related to unrecognized tax benefits are recorded in tax expense. In deciding whether or not our tax positions taken meet the more-likely-than-not recognition threshold, we must make judgments and interpretations about the application of inherently complex state and federal tax laws. To the extent tax authorities disagree with tax positions taken by us, our effective tax rates could be materially affected in the period of settlement with the taxing authorities. Revision of our estimate of accrued income taxes also may result from our own income tax planning, which may affect effective tax rates and results of operations for any reporting period. We present an unrecognized tax benefit as a reduction of a deferred tax asset for a net operating loss ("NOL") carryforward, or similar tax loss or tax credit carryforward, rather than as a liability, when (1) the uncertain tax position would reduce the NOL or other carryforward under the tax law of the applicable jurisdiction and (2) we intend to and are able to use the deferred tax asset for that purpose. Otherwise, the unrecognized tax benefit is presented as a liability instead of being netted with deferred tax assets. Earnings per share (“EPS”) are based upon the weighted average number of common shares outstanding during each year. The following table shows: 1) weighted average basic shares, 2) potentially dilutive weighted average common shares related to stock options, unvested restricted stock awards and stock warrant, and 3) weighted average diluted shares. Basic EPS are calculated by dividing net income by the weighted average number of common shares outstanding

Acquisition

Acquisition	12 Months Ended
	Dec. 31, 2015
Business Combinations [Abstract]
Acquisition	Acquisition On November 29, 2013, we completed the acquisition of NorCal, parent company of Bank of Alameda, to enhance our market presence. The acquisition added $173.8 million in loans, $241.0 million in deposits and $53.7 million in investment securities to Bank of Marin as well as four branch offices serving Alameda, Emeryville, and Oakland. Effective October 31, 2014, the Emeryville branch was closed after Management determined that our customers and the business community can be easily supported from our Oakland location. The assets acquired and liabilities assumed, both tangible and intangible, were recorded at their fair values as of the acquisition date in accordance with ASC 805, Business Combinations . The acquisition was treated as a "reorganization" within the definition of section 368(a) of the Internal Revenue Code and is generally considered tax-free for U.S. federal income tax purposes. Goodwill As a result of the NorCal Acquisition, we recorded $6.4 million in goodwill, which represents the excess of the total purchase price paid over the fair value of the assets acquired, net of the fair values of liabilities assumed. Goodwill mainly reflects expected value created through the combined operations of Bank of Alameda and Bank of Marin and our expanded footprint in the East Bay. At December 31, 2015 and 2014 , we determined that the fair value of our traditional community banking activities (provided through our branch network) exceeded the carrying amount. Therefore, no impairment on goodwill has been recorded. The goodwill is not deductible for tax purposes. Core Deposit Intangible The core deposit intangible represents the estimated future benefits of acquired deposits and is booked separately from the related deposits. The value of the core deposit intangible asset was determined using a discounted cash flow approach to arrive at the cost differential between the core deposits (non-maturity deposits such as transaction, savings and money market accounts) and alternative funding sources. It was calculated as the present value of the difference in cash flows between maintaining the core deposits (interest and net maintenance costs) and the cost of an equal amount of funds with a similar term from an alternative source. The core deposit intangible is amortized on an accelerated basis over an estimated ten -year life, and it is evaluated periodically for impairment. No impairment loss was recognized in 2015 or 2014. We recorded a core deposit intangible asset of $4.6 million at acquisition, of which $69 thousand was amortized in 2013, $771 thousand was amortized in 2014 and $619 thousand was amortized in 2015. At December 31, 2015 , the future estimated amortization expense is as follows: (in thousands) 2016 2017 2018 2019 2020 Thereafter Total Core deposit intangible amortization $ 533 $ 472 $ 413 $ 388 $ 365 $ 942 $ 3,113 Pro Forma Results of Operations The contribution of the acquired operations of the former NorCal Community Bancorp to our results of operations for the period November 29 to December 31, 2013 is as follows: interest income of $1.1 million , interest expense of $68 thousand , non-interest income of $95 thousand , non-interest expense of $1.1 million and income before income taxes of $109 thousand . These amounts include acquisition-related costs, accretion of the discount on the acquired loans, amortization of the fair value mark on time deposits, core deposit intangible amortization, and subordinated debentures amortization. NorCal Community Bancorp's results of operations prior to the acquisition date are not included in our operating results for 2013. The following table presents NorCal Community Bancorp's revenue (interest income and non-interest income) and earnings included in our consolidated statement of comprehensive income for the year ended December 31, 2013. This pro forma information does not necessarily reflect the results of operations that would have resulted had the acquisition been completed on January 1, 2013, nor is it indicative of the results of operations in future periods. Pro Forma Revenue and Earnings (in thousands) Revenue Earnings Actual from November 29, 2013 to December 31, 2013 of NorCal only $ 1,239 $ 70 2013 supplemental pro forma of the combined entity from January 1, 2013 to December 31, 2013 1 $ 79,586 $ 14,514 1 2013 supplemental pro forma earnings include $3.7 million of one-time acquisition related expenses booked at Bank of Marin Bancorp and $1.9 million of one-time acquisition related expenses booked at NorCal Community Bancorp in 2013. Acquisition-related expenses are recognized as incurred and continue until all systems have been converted and operational functions become fully integrated. We did not incur any one-time acquisition-related expenses in 2015. We incurred one-time third-party acquisition-related expenses in the consolidated statements of comprehensive income in 2014 and 2013 as follows: (in thousands) 2014 2013 Data processing $ 442 $ 2,807 * Professional services — 660 Personnel severance 304 203 Other — 74 Total $ 746 $ 3,744 *Primarily relates to NorCal's core processing system contract termination and deconversion fees.

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Investment Securities	12 continuous months Total securities in a loss position (in thousands) Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss Held-to-maturity: Obligations of state & political subdivisions $ 5,830 $ (27 ) $ 359 $ (13 ) $ 6,189 $ (40 ) Corporate bonds 3,009 (1 ) 3,533 (24 ) 6,542 (25 ) Total held-to-maturity 8,839 (28 ) 3,892 (37 ) 12,731 (65 ) Available-for-sale: MBS pass-through securities issued by FHLMC and FNMA 1,960 (11 ) — — 1,960 (11 ) CMOs issued by FNMA — — 4,115 (58 ) 4,115 (58 ) CMOs issued by FHLMC 17,157 (44 ) 2,291 (43 ) 19,448 (87 ) CMOs issued by GNMA 3,262 (16 ) — — 3,262 (16 ) Debentures of government- sponsored agencies 494 (1 ) 9,769 (231 ) 10,263 (232 ) Privately issued CMOs 817 (15 ) — — 817 (15 ) Obligations of state & political subdivisions 2,695 (3 ) 1,112 (5 ) 3,807 (8 ) Corporate bonds 1,002 (1 ) 990 (3 ) 1,992 (4 ) Total available-for-sale 27,387 (91 ) 18,277 (340 ) 45,664 (431 ) Total temporarily impaired securities $ 36,226 $ (119 ) $ 22,169 $ (377 ) $ 58,395 $ (496 ) As of December 31, 2015 , there were six investment positions that had been in a continuous loss position for 12 months or more. These securities consisted of a debenture of government-sponsored agency, an obligation of U.S. state and political subdivisions, one corporate bond and three CMOs. We have evaluated each of the securities and believe that the decline in fair value is primarily driven by factors other than credit. It is probable that we will be able to collect all amounts due according to the contractual terms and no other-than-temporary impairment exists on these securities. The CMOs issued by FNMA, FHLMC and GNMA are supported by the U.S. Federal Government to protect us from credit losses. Additionally, the obligation of state and political subdivisions was deemed creditworthy based on our review of the issuer's recent financial information. The corporate bond subsequently matured and paid off in February 2016. Forty-eight investment securities in our portfolio were in a temporary loss position for less than twelve months as of December 31, 2015 . They consisted of obligations of U.S. state and political subdivisions, corporate bonds, MBS, CMOs, and debentures of government-sponsored agencies. We determine that the strengths of GNMA and FNMA through guarantee or support from the U.S. Federal Government are sufficient to protect us from credit losses. Other temporarily impaired securities are deemed creditworthy after credit analysis. Additionally, all are rated as investment grade by at least one major rating agency. We concluded that these securities were not other-than-temporarily impaired at December 31, 2015 . Non-Marketable Securities As a member of the FHLB, we are required to maintain a minimum investment in the FHLB capital stock determined by the Board of Directors of the FHLB. Investment requirements can increase in the event we increase our borrowings with the FHLB. Shares cannot be purchased or sold except between the FHLB and its members at $100 per share par value. We held $8.4 million and $8.2 million of FHLB stock recorded at cost in other assets at December 31, 2015 and 2014 , respectively. The carrying amounts of these investments are reasonable estimates of fair value because the securities are restricted to member banks and they do not have a readily determinable market value. Management does not believe that the FHLB stock is other-than-temporarily-impaired, as we expect to be able to redeem it at cost. On February 18, 2016, the FHLB announced a cash dividend for the fourth quarter of 2015 at an annualized dividend rate of 7.99% to be distributed in mid-March 2016. As a member bank of Visa U.S.A., we hold 16,939 shares of Visa Inc. Class B common stock with a carrying value of zero , which is equal to our cost basis. These shares are restricted from resale until their conversion into Class A (voting) shares upon the termination of Visa Inc.'s Covered Litigation escrow account. As a result of the restriction, these shares are not considered available-for-sale and are not carried at fair value. Converting this Class B common stock to Class A common stock at a conversion rate of 1.6483 , the value would be $2.2 million and $1.8 million at December 31, 2015 and 2014 , respectively. The conversion rate is subject to further reduction upon the final settlement of the covered litigation against Visa Inc. and its member banks. See Note 13 herein. We invest in low income housing tax credit funds as a limited partner, which totaled $2.7 million and $1.8 million recorded in other assets as of December 31, 2015 and 2014 , respectively. Beginning 2014, we have elected to account for all low income housing investments using the proportional amortization method instead of the cost method. In 2015 , we recognized $225 thousand of low income housing tax credits and other tax benefits, net of $174 thousand of amortization expense of low income housing tax credit investment, as a component of income tax expense for 2015 . As of December 31, 2015 , our unfunded commitments for these low income housing tax credit funds totaled $1.7 million . We did not recognize any impairment losses on these low income housing tax credit investments during 2015 , 2014 or 2013 ." id="sjs-B4">Investment Securities Our investment securities portfolio consists of obligations of state and political subdivisions, corporate bonds, U.S. government agency securities, including mortgage-backed securities (“MBS”) and collateralized mortgage obligations (“CMOs”) issued or guaranteed by Federal National Mortgage Association ("FNMA"), Federal Home Loan Mortgage Corporation ("FHLMC"), or Government National Mortgage Association ("GNMA"), debentures issued by government-sponsored agencies such as FNMA, Federal Farm Credit Bureau, FHLB and FHLMC, as well as privately issued CMOs, as reflected in the table below: December 31, 2015 December 31, 2014 Amortized Fair Gross Unrealized Amortized Fair Gross Unrealized (in thousands) Cost Value Gains (Losses) Cost Value Gains (Losses) Held-to-maturity: Obligations of state and political subdivisions $ 42,919 $ 44,146 $ 1,246 $ (19 ) $ 63,425 $ 65,121 $ 1,736 $ (40 ) Corporate bonds 15,072 15,098 42 (16 ) 40,257 40,448 216 (25 ) MBS pass-through securities issued by FHLMC and FNMA 11,646 11,810 171 (7 ) 12,755 13,074 319 — Total held-to-maturity 69,637 71,054 1,459 (42 ) 116,437 118,643 2,271 (65 ) Available-for-sale: Securities of U.S. government agencies: MBS pass-through securities issued by FHLMC and FNMA 138,222 138,462 694 (454 ) 92,963 94,214 1,262 (11 ) CMOs issued by FNMA 18,266 18,219 97 (144 ) 14,771 14,790 77 (58 ) CMOs issued by FHLMC 22,889 22,932 82 (39 ) 31,238 31,260 109 (87 ) CMOs issued by GNMA 10,326 10,480 169 (15 ) 17,573 17,855 298 (16 ) Debentures of government- sponsored agencies 161,690 160,892 28 (826 ) 14,694 14,557 95 (232 ) Privately issued CMOs 3,960 4,150 190 — 7,137 7,294 172 (15 ) Obligations of state and political subdivisions 57,110 57,673 580 (17 ) 15,733 15,880 155 (8 ) Corporate bonds 4,947 4,979 43 (11 ) 4,936 4,998 66 (4 ) Total available-for-sale 417,410 417,787 1,883 (1,506 ) 199,045 200,848 2,234 (431 ) Total investment securities $ 487,047 $ 488,841 $ 3,342 $ (1,548 ) $ 315,482 $ 319,491 $ 4,505 $ (496 ) The amortized cost and fair value of investment debt securities by contractual maturity at December 31, 2015 and 2014 are shown below. Expected maturities will differ from contractual maturities because the issuers of the securities may have the right to call or prepay obligations with or without call or prepayment penalties. December 31, 2015 December 31, 2014 Held-to-Maturity Available-for-Sale Held-to-Maturity Available-for-Sale (in thousands) Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Within one year $ 18,853 $ 18,920 $ 12,135 $ 12,176 $ 39,778 $ 39,913 $ 2,378 $ 2,388 After one but within five years 31,677 32,360 188,007 187,326 50,983 51,953 43,866 43,919 After five years through ten years 8,580 8,969 64,899 64,999 11,679 12,426 9,644 9,749 After ten years 10,527 10,805 152,369 153,286 13,997 14,351 143,157 144,792 Total $ 69,637 $ 71,054 $ 417,410 $ 417,787 $ 116,437 $ 118,643 $ 199,045 $ 200,848 Sales of investment securities and gross gains and losses are shown in the following table. The sales of the held-to-maturity securities were due to evidence of significant deterioration of the issuers' creditworthiness since purchase. (in thousands) 2015 2014 2013 Available-for-sale: Sales proceeds $ 2,099 $ 2,436 $ 7,973 Gross gains $ 7 $ 4 $ 86 Gross losses, including OTTI $ (1 ) $ (28 ) $ (104 ) Held-to-maturity: Sales proceeds $ 1,015 $ 2,146 $ 6,442 Gross gains $ 73 $ 104 $ 67 Gross losses $ — $ — $ (50 ) Investment securities carried at $87.9 million and $74.7 million at December 31, 2015 and 2014 , respectively, were pledged with the State of California: $87.1 million and $73.8 million to secure public deposits in compliance with the Local Agency Security Program, and $840 thousand and $856 thousand to provide collateral for trust deposits. In addition, investment securities carried at $1.1 million were pledged to collateralize an internal Wealth Management and Trust Services (“WMTS”) checking account at both December 31, 2015 and 2014 . Other-Than-Temporarily Impaired ("OTTI") Debt Securities We have evaluated the credit ratings of our investment securities and their issuers and/or insurers. Based on our evaluation, Management has determined that no investment security in our investment portfolio is other-than-temporarily impaired as of December 31, 2015. We do not have the intent, and it is more likely than not that we will not have to sell the remaining securities temporarily impaired at December 31, 2015 before recovery of the amortized cost basis. Fifty-four and twenty-eight investment securities were in unrealized loss positions at December 31, 2015 and 2014 , respectively. Those securities are summarized and classified according to the duration of the loss period in the tables below: December 31, 2015 < 12 continuous months ≥ 12 continuous months Total securities in a loss position (in thousands) Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss Held-to-maturity: MBS pass-through securities issued by FHLMC and FNMA $ 2,332 $ (7 ) $ — $ — $ 2,332 $ (7 ) Obligations of state & political subdivisions $ 8,297 $ (19 ) $ — $ — $ 8,297 $ (19 ) Corporate bonds 3,523 (15 ) 1,999 (1 ) 5,522 (16 ) Total held-to-maturity 14,152 (41 ) 1,999 (1 ) 16,151 (42 ) Available-for-sale: MBS pass-through securities issued by FHLMC and FNMA 68,809 (454 ) — — 68,809 (454 ) CMOs issued by FNMA 9,277 (80 ) 3,158 (64 ) 12,435 (144 ) CMOs issued by FHLMC — — 1,989 (39 ) 1,989 (39 ) CMOs issued by GNMA 164 — 2,374 (15 ) 2,538 (15 ) Debentures of government- sponsored agencies 136,064 (713 ) 9,887 (113 ) 145,951 (826 ) Obligations of state & political subdivisions 4,557 (15 ) 579 (2 ) 5,136 (17 ) Corporate bonds 2,986 (11 ) — — 2,986 (11 ) Total available-for-sale 221,857 (1,273 ) 17,987 (233 ) 239,844 (1,506 ) Total temporarily impaired securities $ 236,009 $ (1,314 ) $ 19,986 $ (234 ) $ 255,995 $ (1,548 ) December 31, 2014 < 12 continuous months > 12 continuous months Total securities in a loss position (in thousands) Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss Held-to-maturity: Obligations of state & political subdivisions $ 5,830 $ (27 ) $ 359 $ (13 ) $ 6,189 $ (40 ) Corporate bonds 3,009 (1 ) 3,533 (24 ) 6,542 (25 ) Total held-to-maturity 8,839 (28 ) 3,892 (37 ) 12,731 (65 ) Available-for-sale: MBS pass-through securities issued by FHLMC and FNMA 1,960 (11 ) — — 1,960 (11 ) CMOs issued by FNMA — — 4,115 (58 ) 4,115 (58 ) CMOs issued by FHLMC 17,157 (44 ) 2,291 (43 ) 19,448 (87 ) CMOs issued by GNMA 3,262 (16 ) — — 3,262 (16 ) Debentures of government- sponsored agencies 494 (1 ) 9,769 (231 ) 10,263 (232 ) Privately issued CMOs 817 (15 ) — — 817 (15 ) Obligations of state & political subdivisions 2,695 (3 ) 1,112 (5 ) 3,807 (8 ) Corporate bonds 1,002 (1 ) 990 (3 ) 1,992 (4 ) Total available-for-sale 27,387 (91 ) 18,277 (340 ) 45,664 (431 ) Total temporarily impaired securities $ 36,226 $ (119 ) $ 22,169 $ (377 ) $ 58,395 $ (496 ) As of December 31, 2015 , there were six investment positions that had been in a continuous loss position for 12 months or more. These securities consisted of a debenture of government-sponsored agency, an obligation of U.S. state and political subdivisions, one corporate bond and three CMOs. We have evaluated each of the securities and believe that the decline in fair value is primarily driven by factors other than credit. It is probable that we will be able to collect all amounts due according to the contractual terms and no other-than-temporary impairment exists on these securities. The CMOs issued by FNMA, FHLMC and GNMA are supported by the U.S. Federal Government to protect us from credit losses. Additionally, the obligation of state and political subdivisions was deemed creditworthy based on our review of the issuer's recent financial information. The corporate bond subsequently matured and paid off in February 2016. Forty-eight investment securities in our portfolio were in a temporary loss position for less than twelve months as of December 31, 2015 . They consisted of obligations of U.S. state and political subdivisions, corporate bonds, MBS, CMOs, and debentures of government-sponsored agencies. We determine that the strengths of GNMA and FNMA through guarantee or support from the U.S. Federal Government are sufficient to protect us from credit losses. Other temporarily impaired securities are deemed creditworthy after credit analysis. Additionally, all are rated as investment grade by at least one major rating agency. We concluded that these securities were not other-than-temporarily impaired at December 31, 2015 . Non-Marketable Securities As a member of the FHLB, we are required to maintain a minimum investment in the FHLB capital stock determined by the Board of Directors of the FHLB. Investment requirements can increase in the event we increase our borrowings with the FHLB. Shares cannot be purchased or sold except between the FHLB and its members at $100 per share par value. We held $8.4 million and $8.2 million of FHLB stock recorded at cost in other assets at December 31, 2015 and 2014 , respectively. The carrying amounts of these investments are reasonable estimates of fair value because the securities are restricted to member banks and they do not have a readily determinable market value. Management does not believe that the FHLB stock is other-than-temporarily-impaired, as we expect to be able to redeem it at cost. On February 18, 2016, the FHLB announced a cash dividend for the fourth quarter of 2015 at an annualized dividend rate of 7.99% to be distributed in mid-March 2016. As a member bank of Visa U.S.A., we hold 16,939 shares of Visa Inc. Class B common stock with a carrying value of zero , which is equal to our cost basis. These shares are restricted from resale until their conversion into Class A (voting) shares upon the termination of Visa Inc.'s Covered Litigation escrow account. As a result of the restriction, these shares are not considered available-for-sale and are not carried at fair value. Converting this Class B common stock to Class A common stock at a conversion rate of 1.6483 , the value would be $2.2 million and $1.8 million at December 31, 2015 and 2014 , respectively. The conversion rate is subject to further reduction upon the final settlement of the covered litigation against Visa Inc. and its member banks. See Note 13 herein. We invest in low income housing tax credit funds as a limited partner, which totaled $2.7 million and $1.8 million recorded in other assets as of December 31, 2015 and 2014 , respectively. Beginning 2014, we have elected to account for all low income housing investments using the proportional amortization method instead of the cost method. In 2015 , we recognized $225 thousand of low income housing tax credits and other tax benefits, net of $174 thousand of amortization expense of low income housing tax credit investment, as a component of income tax expense for 2015 . As of December 31, 2015 , our unfunded commitments for these low income housing tax credit funds totaled $1.7 million . We did not recognize any impairment losses on these low income housing tax credit investments during 2015 , 2014 or 2013 .

Loans and Allowance for Loan Lo

Loans and Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2015
Receivables [Abstract]
Loans and Allowance for Loan Losses	Loans and Allowance for Loan Losses Credit Quality of Loans Virtually all of our loans are generated from customers located in California, primarily in the counties of Marin, Alameda, Sonoma, San Francisco and Napa. Approximately 85% and 87% at December 31, 2015 and 2014 , respectively, of total loans were secured by real estate, while 2% were unsecured at both December 31, 2015 and 2014 . At December 31, 2015 , 66% of our loans were for commercial real estate, 83% of which were secured by real estate located in Marin, Sonoma, Alameda, San Francisco and Napa counties (California). Outstanding loans by class and payment aging as of December 31, 2015 and 2014 are as follows: Loan Aging Analysis by Class as of December 31, 2015 and 2014 (dollars in thousands) Commercial and industrial Commercial real estate, owner-occupied Commercial real estate, investor Construction Home equity Other residential 1 Installment and other consumer Total December 31, 2015 30-59 days past due $ 36 $ — $ 1,096 $ 1 $ — $ — $ 249 $ 1,382 60-89 days past due — — — — 633 — 89 722 90 days or more past due 21 — — — 99 — — 120 Total past due 57 — 1,096 1 732 — 338 2,224 Current 219,395 242,309 714,783 65,494 111,568 73,154 22,301 1,449,004 Total loans 3 $ 219,452 $ 242,309 $ 715,879 $ 65,495 $ 112,300 $ 73,154 $ 22,639 $ 1,451,228 Non-accrual loans 2 $ 21 $ — $ 1,903 $ 1 $ 171 $ — $ 83 $ 2,179 December 31, 2014 30-59 days past due $ 183 $ — $ — $ — $ 646 $ — $ 180 $ 1,009 Non-accrual loans 2 — 1,403 2,429 5,134 280 — 104 9,350 Total past due 183 1,403 2,429 5,134 926 — 284 10,359 Current 210,040 229,202 671,070 43,279 109,862 73,035 16,504 1,352,992 Total loans 3 $ 210,223 $ 230,605 $ 673,499 $ 48,413 $ 110,788 $ 73,035 $ 16,788 $ 1,363,351 1 Our residential loan portfolio includes no sub-prime loans, nor is it our normal practice to underwrite loans commonly referred to as "Alt-A mortgages," the characteristics of which are loans lacking full documentation, borrowers having low FICO scores or higher loan-to-value ratios. 2 Amounts include $1 thousand and $1.4 million of Purchased Credit Impaired ("PCI") loans that have stopped accreting interest at December 31, 2015 and 2014 , respectively. Amounts exclude accreting PCI loans of $3.7 million and $3.8 million at December 31, 2015 and 2014 , respectively, as we have a reasonable expectation about future cash flows to be collected and we continue to recognize accretable yield on these loans in interest income. There were no accruing loans past due more than ninety days at December 31, 2015 or 2014 . 3 Amounts included deferred loan origination costs, net of deferred loan origination fees, of $768 thousand and $487 thousand at December 31, 2015 and 2014 , respectively. Amounts were also net of unaccreted purchase discounts on non-PCI loans of $3.2 million and $4.4 million at December 31, 2015 and 2014 , respectively. Our commercial loans are generally made to established small and mid-sized businesses to provide financing for their growth and working capital needs, equipment purchases and/or acquisitions. Management examines historical, current, and projected cash flows to determine the ability of the borrower to repay obligations as agreed. Commercial loans are made based primarily on the identified cash flows of the borrower and secondarily on the underlying collateral and/or guarantor support. The cash flows of borrowers, however, may not occur as expected, and the collateral securing these loans may fluctuate in value. Most commercial and industrial loans are secured by the assets being financed, such as accounts receivable and/or inventory, and typically include a personal guarantee. We target stable businesses with guarantors that have proven to be resilient in periods of economic stress. Typically, the guarantors provide an additional source of repayment for most of our credit extensions. Commercial real estate loans are subject to underwriting standards and processes similar to commercial loans discussed above. We underwrite these loans to be repaid from cash flow and to be supported by real property collateral. Underwriting standards for commercial real estate loans include, but are not limited to, debt coverage and loan-to-value ratios. Furthermore, substantially all of our loans are guaranteed by the owners of the properties. Commercial real estate loans may be adversely affected by conditions in the real estate markets or in the general economy. In the event of a vacancy, guarantors are expected to carry the loans until a replacement tenant can be found. The owner's substantial equity investment provides a strong economic incentive to continue to support the commercial real estate projects. As such, we have generally experienced a relatively low level of loss and delinquencies in this portfolio. Construction loans are generally made to developers and builders to finance construction, renovation and occasionally land acquisitions. These loans are underwritten after evaluation of the borrower's financial strength, reputation, prior track record, and independent appraisals. The construction industry can be affected by significant events, including: the inherent volatility of real estate markets and vulnerability to delays due to weather, change orders, inability to obtain construction permits, labor or material shortages, and price changes. Estimates of construction costs and value associated with the completed project may be inaccurate. Repayment of construction loans is largely dependent on the ultimate success of the project. Consumer loans primarily consist of home equity lines of credit, other residential (tenancy-in-common, or “TIC”) loans, and installment and other consumer loans. We originate consumer loans utilizing credit score information, debt-to-income ratio and loan-to-value ratio analysis. Diversification, coupled with relatively small loan amounts that are spread across many individual borrowers, mitigates risk. Additionally, trend reports are reviewed by Management on a regular basis. Our residential loan portfolio includes TIC units almost entirely in San Francisco. These loans tend to have more equity in their properties than conventional residential mortgages, which mitigates risk. Installment and other consumer loans include mostly loans for floating homes and mobile homes along with a small number of installment loans. We use a risk rating system to evaluate asset quality, and to identify and monitor credit risk in individual loans, and ultimately in the portfolio. Definitions of loans that are risk graded “Special Mention” or worse are consistent with those used by the Federal Deposit Insurance Corporation ("FDIC"). Our internally assigned grades are as follows: Pass : Loans to borrowers of acceptable or better credit quality. Borrowers in this category demonstrate fundamentally sound financial positions, repayment capacity, credit history and management expertise. Loans in this category must have an identifiable and stable source of repayment and meet the Bank’s policy regarding debt service coverage ratios. These borrowers are capable of sustaining normal economic, market or operational setbacks without significant financial consequences. Negative external industry factors are generally not present. The loan may be secured, unsecured or supported by non-real estate collateral for which the value is more difficult to determine and/or marketability is more uncertain. This category also includes “Watch” loans, where the primary source of repayment has been delayed. “Watch” is intended to be a transitional grade, with either an upgrade or downgrade within a reasonable period. Special Mention : Potential weaknesses that deserve close attention. If left uncorrected, those potential weaknesses may result in deterioration of the payment prospects for the asset. Special Mention assets do not present sufficient risk to warrant adverse classification. Substandard : Inadequately protected by either the current sound worth and paying capacity of the obligor or the collateral pledged, if any. A Substandard asset has a well-defined weakness or weaknesses that jeopardize(s) the liquidation of the debt. Substandard assets are characterized by the distinct possibility that we will sustain some loss if such weaknesses or deficiencies are not corrected. Well-defined weaknesses include adverse trends or developments of the borrower’s financial condition, managerial weaknesses and/or significant collateral deficiencies. Doubtful : Critical weaknesses that make collection or liquidation in full improbable. There may be specific pending events that work to strengthen the asset; however, the amount or timing of the loss may not be determinable. Pending events generally occur within one year of the asset being classified as Doubtful. Examples include: merger, acquisition, or liquidation; capital injection; guarantee; perfecting liens on additional collateral; and refinancing. Such loans are placed on non-accrual status and usually are collateral-dependent. We regularly review our credits for accuracy of risk grades whenever new information is received. Borrowers are required to submit financial information at regular intervals: • Generally, commercial borrowers with lines of credit are required to submit financial information with reporting intervals ranging from monthly to annually depending on credit size, risk and complexity. • Investor commercial real estate borrowers are generally required to submit rent rolls or property income statements at least annually. • Construction loans are monitored monthly, and reviewed on an ongoing basis. • Home equity and other consumer loans are reviewed based on delinquency. • Loans graded “Watch” or more severe, regardless of loan type, are reviewed no less than quarterly. The following table represents an analysis of loans by internally assigned grades, including PCI loans, at December 31, 2015 and 2014 : (in thousands) Commercial and industrial Commercial real estate, owner-occupied Commercial real estate, investor Construction Home equity Other residential Installment and other consumer Purchased credit-impaired Total Credit Risk Profile by Internally Assigned Grade: December 31, 2015 Pass $ 192,560 $ 219,060 $ 710,042 $ 62,255 $ 109,959 $ 73,154 $ 22,307 $ 3,260 $ 1,392,597 Special Mention 22,457 12,371 372 — 1,100 — — — 36,300 Substandard 4,260 9,167 3,739 3,239 1,173 — 332 421 22,331 Total loans $ 219,277 $ 240,598 $ 714,153 $ 65,494 $ 112,232 $ 73,154 $ 22,639 $ 3,681 $ 1,451,228 December 31, 2014 Pass $ 197,659 $ 205,820 $ 651,548 $ 41,710 $ 107,933 $ 70,987 $ 16,101 $ 2,210 $ 1,293,968 Special Mention 6,776 10,406 13,304 1,008 322 — 190 1,140 33,146 Substandard 5,464 11,763 6,473 5,684 2,466 2,048 497 1,842 36,237 Total loans $ 209,899 $ 227,989 $ 671,325 $ 48,402 $ 110,721 $ 73,035 $ 16,788 $ 5,192 $ 1,363,351 Troubled Debt Restructuring Our loan portfolio includes certain loans that have been modified in a troubled debt restructuring (“TDR”), where economic concessions have been granted to borrowers experiencing financial difficulties. These concessions typically result from our loss mitigation activities and could include reductions in the interest rate, payment extensions, forgiveness of principal, forbearance or other actions. TDRs on non-accrual status at the time of restructure may be returned to accruing status after Management considers the borrower’s sustained repayment performance for a reasonable period, generally six months, and obtains reasonable assurance of repayment and performance. A loan may no longer be reported as a TDR if all of the following conditions are met: • The loan is subsequently refinanced or restructured at current market interest rates and the new terms are consistent with the treatment of creditworthy borrowers under regular underwriting standards; • The borrower is no longer considered to be in financial difficulty; • Performance on the loan is reasonably assured; and; • Existing loan did not have any forgiveness of principal or interest. The removal of TDR status must be approved by the same management level that approved the upgrading of the loan classification. During 2015, five loans with a recorded investment totaling $1.6 million were removed from TDR designation. There were no loans removed from TDR designation during 2014. The table below summarizes outstanding TDR loans by loan class as of December 31, 2015 and December 31, 2014 . The summary includes both TDRs that are on non-accrual status and those that continue to accrue interest. (in thousands) As of Recorded investment in Troubled Debt Restructurings 1 December 31, 2015 December 31, 2014 Commercial and industrial $ 4,698 $ 3,584 Commercial real estate, owner-occupied 6,993 8,459 Commercial real estate, investor 514 524 Construction 2 3,238 5,684 Home equity 460 694 Other residential 2,010 2,045 Installment and other consumer 1,168 1,713 Total $ 19,081 $ 22,703 1 Includes $19.0 million and $15.9 million of TDR loans that were accruing interest as of December 31, 2015 and December 31, 2014 respectively. Includes $137 thousand and $1.8 million of acquired loans at December 31, 2015 and December 31, 2014 , respectively. 2 In June 2015, one TDR loan was transferred to loans held-for-sale at fair value totaling $1.5 million , net of an $839 thousand charge-off to the allowance for loan losses. The loan was subsequently sold in June 2015 for no gain or loss. The table below presents the following information for loans modified in a TDR during the presented periods, number of contracts modified, the recorded investment in the loans prior to modification, and the recorded investment in the loans after being restructured. The table below excludes fully charged-off TDR loans and loans modified in a TDR and subsequently paid-off during the years presented. (dollars in thousands) Number of Contracts Modified Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment at period end Troubled Debt Restructurings during the year ended December 31, 2015: Commercial and industrial 7 $ 3,271 $ 3,251 $ 2,811 Total 7 $ 3,271 $ 3,251 $ 2,811 Troubled Debt Restructurings during the year ended December 31, 2014: Commercial and industrial 6 $ 1,039 $ 1,258 $ 1,251 Commercial real estate, owner occupied 1 4,226 4,216 4,175 Commercial real estate, investor 2 224 224 220 Construction 2 964 1,312 1,309 Installment and other consumer 6 281 278 268 Total 17 $ 6,734 $ 7,288 $ 7,223 Troubled Debt Restructurings during the year ended December 31, 2013: Commercial and industrial 8 $ 1,176 $ 1,377 $ 1,274 Construction 1 2,961 2,956 2,930 Home Equity 1 539 538 534 Other residential 3 7,135 7,156 5,368 Installment and other consumer 2 11 9 7 Total 15 $ 11,822 $ 12,036 $ 10,113 Modifications during 2015 , 2014 and 2013 primarily involved maturity or payment extensions and interest rate concessions or some combination thereof. During 2015 , 2014 and 2013 , there were no defaults on loans that had been modified in a TDR within the prior twelve-month period. We report defaulted TDRs based on a payment default definition of more than ninety days past due. Impaired Loan Balances and Their Related Allowance by Major Classes of Loans The table below summarizes information on impaired loans and their related allowances. Total impaired loans include non-accrual loans, accruing TDR loans and accreting PCI loans that have experienced post-acquisition declines in cash flows expected to be collected. (in thousands) Commercial and industrial Commercial real estate, owner-occupied Commercial real estate, investor Construction Home equity Other residential Installment and other consumer Total December 31, 2015 Recorded investment in impaired loans: With no specific allowance recorded $ 2,198 $ 4,111 $ 2,416 $ 2,687 $ 171 $ 1,214 $ 131 $ 12,928 With a specific allowance recorded 2,522 2,882 — 551 388 797 1,120 8,260 Total recorded investment in impaired loans $ 4,720 $ 6,993 $ 2,416 $ 3,238 $ 559 $ 2,011 $ 1,251 $ 21,188 Unpaid principal balance of impaired loans: With no specific allowance recorded $ 2,198 $ 4,111 $ 4,408 $ 2,687 $ 171 $ 1,214 $ 131 $ 14,920 With a specific allowance recorded 2,565 2,882 — 737 388 797 1,120 8,489 Total unpaid principal balance of impaired loans $ 4,763 $ 6,993 $ 4,408 $ 3,424 $ 559 $ 2,011 $ 1,251 $ 23,409 Specific allowance $ 912 $ 70 $ — $ 1 $ 3 $ 67 $ 116 $ 1,169 Average recorded investment in impaired loans during 2015 $ 4,237 $ 7,886 $ 2,833 $ 4,164 $ 602 $ 2,028 $ 1,523 $ 23,273 Interest income recognized on impaired loans during 2015 $ 238 $ 295 $ 33 $ 86 $ 18 $ 92 $ 64 $ 826 December 31, 2014 Recorded investment in impaired loans: With no specific allowance recorded $ 1,141 $ 5,577 $ 2,954 $ 5,134 $ 393 $ 1,026 $ 239 $ 16,464 With a specific allowance recorded 2,443 2,882 — 561 300 1,019 1,554 8,759 Total recorded investment in impaired loans $ 3,584 $ 8,459 $ 2,954 $ 5,695 $ 693 $ 2,045 $ 1,793 $ 25,223 Unpaid principal balance of impaired loans: With no specific allowance recorded $ 1,186 $ 6,577 $ 4,945 $ 7,824 $ 880 $ 1,026 $ 239 $ 22,677 With a specific allowance recorded 2,524 2,882 — 749 300 1,019 1,554 9,028 Total recorded investment in impaired loans $ 3,710 $ 9,459 $ 4,945 $ 8,573 $ 1,180 $ 2,045 $ 1,793 $ 31,705 Specific allowance $ 694 $ 65 $ — $ 3 $ — $ 92 $ 284 $ 1,138 Average recorded investment in impaired loans during 2014 $ 5,354 $ 6,604 $ 3,138 $ 6,471 $ 741 $ 1,744 $ 1,857 $ 25,909 Interest income recognized on impaired loans during 2014 $ 378 $ 288 $ 28 $ 85 $ 19 $ 74 $ 76 $ 948 Average recorded investment in impaired loans during 2013 $ 7,168 $ 3,519 $ 5,847 $ 7,200 $ 909 $ 2,632 $ 1,872 $ 29,147 Interest income recognized on impaired loans during 2013 $ 476 $ 253 $ 14 $ 249 $ 29 $ 89 $ 71 $ 1,181 Management monitors delinquent loans continuously and identifies problem loans, generally loans graded substandard or worse, to be evaluated individually for impairment testing. Generally, the recorded investment in impaired loans is net of any charge-offs from estimated losses related to specifically-identified impaired loans when they are deemed uncollectible. The charged-off portion of impaired loans outstanding at December 31, 2015 and 2014 totaled approximately $2.1 million and $5.5 million , respectively. In addition, the recorded investment in impaired loans is net of purchase discounts or premiums on acquired loans. At December 31, 2015 and 2014 , outstanding commitments to extend credit on impaired loans, including performing loans to borrowers whose terms have been modified in TDRs, totaled $1.3 million and $1.4 million , respectively. The following tables disclose loans by major portfolio category and activity in the ALLL, as well as the related ALLL disaggregated by impairment evaluation method: Allowance for Loan Losses and Recorded Investment In Loans (dollars in thousands) Commercial and industrial Commercial real estate, owner-occupied Commercial real estate, investor Construction Home equity Other residential Installment and other consumer Unallocated Total As of December 31, 2015: Ending ALLL related to loans collectively evaluated for impairment $ 2,111 $ 2,179 $ 6,178 $ 723 $ 907 $ 327 $ 309 $ 1,096 $ 13,830 Ending ALLL related to loans individually evaluated for impairment 904 70 — — 3 67 116 — 1,160 Ending ALLL related to purchased credit-impaired loans 8 — — 1 — — — — 9 Ending balance $ 3,023 $ 2,249 $ 6,178 $ 724 $ 910 $ 394 $ 425 $ 1,096 $ 14,999 Loans outstanding: Collectively evaluated for impairment $ 214,695 $ 233,605 $ 711,737 $ 62,256 $ 111,673 $ 71,143 $ 21,388 $ — $ 1,426,497 Individually evaluated for impairment 1 4,582 6,993 2,416 3,238 559 2,011 1,251 — 21,050 Purchased credit-impaired 175 1,711 1,726 1 68 — — — 3,681 Total $ 219,452 $ 242,309 $ 715,879 $ 65,495 $ 112,300 $ 73,154 $ 22,639 $ — $ 1,451,228 Ratio of allowance for loan losses to total loans 1.38 % 0.93 % 0.86 % 1.11 % 0.81 % 0.54 % 1.88 % NM 1.03 % Allowance for loan losses to non-accrual loans 14,395 % NM 325 % 72,400 % 532 % NM 512 % NM 688 % 1 Total excludes $138 thousand of PCI loans that have experienced post-acquisition declines in cash flows expected to be collected. These loans are included in the "purchased credit-impaired" amount in the next line below. NM - Not Meaningful Allowance for Loan Losses and Recorded Investment In Loans (dollars in thousands) Commercial and industrial Commercial real estate, owner-occupied Commercial real estate, investor Construction Home equity Other residential Installment and other consumer Unallocated Total As of December 31, 2014: Ending ALLL related to loans collectively evaluated for impairment $ 2,143 $ 1,859 $ 6,672 $ 836 $ 859 $ 341 $ 282 $ 969 $ 13,961 Ending ALLL related to loans individually evaluated for impairment 690 65 — — — 92 284 — 1,131 Ending ALLL related to purchased credit-impaired loans 4 — — 3 — — — — 7 Ending balance $ 2,837 $ 1,924 $ 6,672 $ 839 $ 859 $ 433 $ 566 $ 969 $ 15,099 Loans outstanding: Collectively evaluated for impairment $ 206,603 $ 220,933 $ 668,371 $ 42,718 $ 110,028 $ 70,990 $ 14,995 $ — $ 1,334,638 Individually evaluated for impairment 1 3,296 7,056 2,954 5,684 693 2,045 1,793 — 23,521 Purchased credit-impaired 324 2,616 2,174 11 67 — — — 5,192 Total $ 210,223 $ 230,605 $ 673,499 $ 48,413 $ 110,788 $ 73,035 $ 16,788 $ — $ 1,363,351 Ratio of allowance for loan losses to total loans 1.35 % 0.83 % 0.99 % 1.73 % 0.78 % 0.59 % 3.37 % NM 1.11 % Allowance for loan losses to non-accrual loans NM 137 % 275 % 16 % 307 % NM 544 % NM 161 % 1 Total excludes $1.7 million PCI loans that have experienced credit deterioration post-acquisition, which are included in the "purchased credit-impaired" amount in the next line below. NM - Not Meaningful Allowance for Loan Losses Rollforward for the Period (in thousands) Commercial and industrial Commercial real estate, owner-occupied Commercial real estate, investor Construction Home equity Other residential Installment and other consumer Unallocated Total Year ended December 31, 2015: Allowance for loan losses: Beginning balance 2,837 1,924 6,672 839 859 433 566 969 15,099 Provision (reversal) (45 ) 325 (517 ) 724 48 (39 ) (123 ) 127 500 Charge-offs (5 ) — — (839 ) — — (20 ) — (864 ) Recoveries $ 236 $ — $ 23 $ — $ 3 $ — $ 2 $ — $ 264 Ending balance $ 3,023 $ 2,249 $ 6,178 $ 724 $ 910 $ 394 $ 425 $ 1,096 $ 14,999 Year ended December 31, 2014: Allowance for loan losses: Beginning balance $ 3,056 $ 2,012 $ 6,196 $ 633 $ 875 $ 317 $ 629 $ 506 $ 14,224 Provision (reversal) (321 ) (93 ) 431 314 (19 ) 116 (141 ) 463 750 Charge-offs (66 ) — — (204 ) — — (7 ) — (277 ) Recoveries 168 5 45 96 3 — 85 — 402 Ending balance $ 2,837 $ 1,924 $ 6,672 $ 839 $ 859 $ 433 $ 566 $ 969 $ 15,099 Year ended December 31, 2013: Allowance for loan losses: Beginning balance $ 4,100 $ 1,313 $ 4,372 $ 611 $ 1,264 $ 551 $ 1,231 $ 219 $ 13,661 Provision (reversal) (1,393 ) 615 1,940 83 (223 ) (234 ) (535 ) 287 540 Charge-offs (672 ) — (156 ) (62 ) (176 ) — (88 ) — (1,154 ) Recoveries 1,021 84 40 1 10 — 21 — 1,177 Ending balance $ 3,056 $ 2,012 $ 6,196 $ 633 $ 875 $ 317 $ 629 $ 506 $ 14,224 Purchased Credit-Impaired Loans We evaluated loans purchased in acquisitions in accordance with accounting guidance in ASC 310-30 related to loans acquired with deteriorated credit quality. Acquired loans are considered credit-impaired if there is evidence of significant deterioration of credit quality since origination and it is probable, at the acquisition date, that we will be unable to collect all contractually required payments receivable. Management has determined certain loans purchased in our two acquisitions to be PCI loans based on credit indicators such as nonaccrual status, past due status, loan risk grade, loan-to-value ratio, etc. Revolving credit agreements (e.g., home equity lines of credit and revolving commercial loans) are not considered PCI loans as cash flows cannot be reasonably estimated. For acquired loans not considered credit-impaired, the difference between the contractual amounts due (principal amount) and the fair value is accounted for subsequently through accretion. We recognize discount accretion based on the acquired loan’s contractual cash flows using an effective interest rate method. The accretion is recognized through the net interest margin. The following table presents the fair value of purchased credit-impaired and other loans acquired from Bank of Alameda as of the acquisition date: November 29, 2013 (in thousands) Purchased credit-impaired loans Other purchased loans Total Contractually required payments including interest $ 5,706 $ 211,769 $ 217,475 Less: nonaccretable difference (1,183 ) — (1,183 ) Cash flows expected to be collected (undiscounted) 4,523 211,769 216,292 Accretable yield (707 ) (41,826 ) (42,533 ) Fair value of purchased loans $ 3,816 $ 169,943 $ 173,759 1 $6.6 million of the $41.8 million represents the difference between the contractual principal amounts due and the fair value. This discount is to be accreted to interest income over the remaining lives of the loans. The remaining $35.2 million is the contractual interest to be earned over the life of the loans. The following table reflects the outstanding balance and related carrying value of PCI loans as of the acquisition date: November 29, 2013 PCI Loans (in thousands) Unpaid principal balance Fair value Commercial and industrial $ 847 $ 369 Commercial real estate 3,757 3,362 Construction 150 16 Home equity 239 69 Total purchased credit-impaired loans $ 4,993 $ 3,816 For the PCI loans, the accretable yield initially represents the excess of the cash flows expected to be collected at acquisition over the fair value of the loans at the acquisition date, and is accreted into interest income over the estimated remaining life of the purchased credit-impaired loans using the effective yield method, provided that the timing and amount of future cash flows is reasonably estimable. The accretable yield is affected by: • Changes in interest rate indices for variable rate loans – Expected future cash flows are based on the variable rates in effect at the time of the regular evaluations of cash flows expected to be collected; • Changes in prepayment assumptions – Prepayments affect the estimated life of the loans which may change the amount of interest income, and possibly principal, expected to be collected; and • Changes in the expected principal and interest payments over the estimated life – Updates to expected cash flows are driven by the credit outlook and actions taken with borrowers. Changes in expected future cash flows from loan modifications are included in the regular evaluations of cash flows expected to be collected. The cash flows expected to be collected are updated each quarter based on current assumptions regarding default rates, loss severities, and other factors that are reflective of current market conditions. Probable decreases in expected cash flows after acquisition result in the recognition of impairment as a specific allowance for loan losses or a charge-off to the allowance. The increase of specific allowance for PCI loan losses amounted to $4 thousand , $3 thousand and $203 thousand during 2015 , 2014 and 2013 respectively. Probable and significant increases in expected cash flows would first reverse any related allowance for loan losses and any remaining increases would be recognized prospectively as interest income over the estimated remaining lives of the loans. During 2015 , 2014 and 2013 , the amount of reduction in the allowance for loan losses established for PCI loans due to the increase in the present value of cash flows expected to be collected was $2 thousand , $238 thousand and $237 thousand, respectively. The nonaccretable difference represents the difference between the undiscounted contractual cash flows and the undiscounted expected cash flows, and also reflects the estimated credit losses in the acquired loan portfolio at the acquisition date and can fluctuate due to changes in expected cash flows during the life of the PCI loans. The following table reflects the outstanding balance and related carrying value of PCI loans related to the 2013 NorCal acquisition and the 2011 Charter Oak acquisition as of December 31, 2015 and 2014 : December 31, 2015 December 31, 2014 PCI Loans (dollars in thousands) Unpaid principal balance Carrying value Unpaid principal balance Carrying value Commercial and industrial $ 237 $ 175 $ 479 $ 324 Commercial real estate 4,329 3,437 6,831 4,790 Construction 187 1 136 11 Home equity 224 68 232 67 Total purchased credit-impaired loans $ 4,977 $ 3,681 $ 7,678 $ 5,192 The activities in the accretable yield, or income expected to be earned, for PCI loans were as follows: Accretable Yield Years ended (dollars in thousands) December 31, 2015 December 31, 2014 December 31, 2013 Balance at beginning of period $ 4,027 $ 3,649 $ 3,960 Additions — — 707 Removals 1 (914 ) (273 ) (793 ) Accretion (495 ) (613 ) (725 ) Reclassifications from nonaccretable difference 2 — 1,264 500 Balance at end of period $ 2,618 $ 4,027 $ 3,649 1 Represents the accretable difference that is relieved when a loan exits the PCI population due to payoff, full charge-off, or transfer to repossessed assets, etc. 2 Primarily relates to changes in expected credit performance and changes in expected timing of cash flows. Pledged Loans Our FHLB line of credit is secured under terms of a blanket collateral agreement by a pledge of certain qualifying loans with an unpaid principal balance of $833.8 million and $868.1 million at December 31, 2015 and 2014 , respectively. In addition, we pledge a certain residential loan portfolio, which totaled $45.2 million and $27.7 million at December 31, 2015 and 2014 , respectively, to secure our borrowing capacity with the Federal Reserve Bank ( “ FRB ” ). Also see Note 8 below. Related Party Loans The Bank has, and expects to have in the future, banking transactions in the ordinary course of its business with directors, officers, principal shareholders and their associates. These transactions, including loans, are granted on substantially the same terms, including interest rates and collateral on loans, as those prevailing at the same time for comparable transactions with persons not related to us. Likewise, these transactions do not involve more than the normal risk of collectability or present other unfavorable features. An analysis of net loans to related parties for each of the three years ended December 31, 2015 , 2014 and 2013 is as follows: (in thousands) 2015 2014 2013 Balance at beginning of year $ 3,329 $ 3,749 $ 3,425 Additions — — 550 Advances 165 — 569 Repayments (390 ) (420 ) — Reclassified as unrelated-party loan due to a change in borrower status (542 ) — (795 ) Balance at end of year $ 2,562 $ 3,329 $ 3,749 Undisbursed commitments to related parties totaled $1.0 million as of December 31, 2015 and 2014 .

Bank Premises and Equipment

Bank Premises and Equipment	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Bank Premises and Equipment	Bank Premises and Equipment A summary of Bank premises and equipment at December 31 follows: (in thousands) 2015 2014 Leasehold improvements $ 13,615 $ 13,866 Furniture and equipment 9,887 9,040 Subtotal 23,502 22,906 Accumulated depreciation and amortization (14,197 ) (13,047 ) Bank premises and equipment, net $ 9,305 $ 9,859 The amount of depreciation and amortization totaled $2.0 million , $1.6 million , and $1.4 million for the years ended December 31, 2015 , 2014 and 2013 , respectively.

Bank Owned Life Insurance

Bank Owned Life Insurance	12 Months Ended
	Dec. 31, 2015
Insurance [Abstract]
Bank Owned Life Insurance	Bank Owned Life Insurance We have purchased life insurance policies on the lives of certain officers designated by the Board of Directors to finance employee benefit programs as of December 31, 2015 . Death benefits provided under the specific terms of these programs are estimated to be $64.1 million at December 31, 2015 and the benefits to employees' beneficiaries are limited to the employee's active service period. The investment in bank owned life insurance policies are reported in interest receivable and other assets at their cash surrender value of $29.5 million and $28.6 million at December 31, 2015 and December 31, 2014 , respectively. The cash surrender value includes both the original premiums paid for the life insurance policies and the accumulated accretion of policy income since inception of the policies. Income of $814 thousand , $841 thousand and $954 thousand was recognized on the life insurance policies in 2015 , 2014 and 2013 , respectively. 2013 BOLI income includes a $228 thousand benefit realized on the death of an insured employee. We regularly monitor the credit ratings of our insurance carriers to ensure that they are in compliance with our policy.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2015
Banking and Thrift [Abstract]
Deposits	Deposits A stratification of time deposits at December 31, 2015 and 2014 is presented in the following table: (in thousands) December 31, 2015 December 31, 2014 Time deposits of less than $100 thousand $ 39,534 $ 44,130 Time deposits of $100 thousand to $250 thousand 67,352 58,240 Time deposits of more than $250 thousand 54,571 47,344 Total time deposits $ 161,457 $ 149,714 Interest on time deposits was $853 thousand , $917 thousand and $922 thousand in 2015 , 2014 and 2013 , respectively. Scheduled maturities of time deposits at December 31, 2015 are presented as follows: (in thousands) 2016 2017 2018 2019 2020 Thereafter Total Scheduled maturities of time deposits $ 113,232 $ 23,482 $ 9,317 $ 7,482 $ 7,944 $ — $ 161,457 As of December 31, 2015 , $50.9 million in securities held-to-maturity and $36.2 million securities available-for-sale were pledged as collateral for our local agency deposits. Our deposit portfolio includes deposits offered through the Promontory Interfinancial Network that are comprised of Certificate of Deposit Account Registry Service ® ("CDARS") balances included in time deposits and Insured Cash Sweep ® ("ICS") balances included in money market deposits. Through this network, we are able to offer our customers access to FDIC-insured deposit products in aggregate amounts exceeding current insurance limits. When we place funds through CDARS and ICS on behalf of a customer, we typically receive matching deposits through the network's reciprocal deposit program. We consider the reciprocal deposits to be in-market deposits as distinguished from traditional out-of-market brokered deposits. We also have the ability to place deposits through the network for which we receive no matching deposits. At December 31, 2015, we had $14.3 million in CDARS and $12.2 million in ICS balances in the reciprocal deposit program. At December 31, 2014, we had no CDARS or ICS deposits in the reciprocal deposit program. At December 31, 2015 and 2014 we had placed $355 thousand and $18.3 million , respectively, in CDARS deposits for which we received no matching deposits. The aggregate amount of deposit overdrafts that have been reclassified as loan balances was $84 thousand and $380 thousand at December 31, 2015 and 2014 , respectively. Collectability of these overdrafts is subject to the same credit review process as other loans. The Bank accepts deposits from shareholders, directors and employees in the normal course of business, and the terms are comparable to those with non-affiliated parties. The total deposits from directors and their businesses, and executive officers were $8.3 million and $8.8 million at December 31, 2015 and 2014 , respectively.

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Borrowings	Borrowings Federal Funds Purchased – We had unsecured lines of credit totaling $92.0 million and $72.0 million with correspondent banks for overnight borrowings at December 31, 2015 and 2014 , respectively. In general, interest rates on these lines approximate the federal funds target rate. At December 31, 2015 and December 31, 2014 , we had no overnight borrowings outstanding under these credit facilities. Federal Home Loan Bank Borrowings – As of December 31, 2015 and 2014 , we had lines of credit with the FHLB totaling $470.6 million and $450.6 million , respectively, based on asset size and eligible collateral of certain loans. At December 31, 2015 , FHLB overnight borrowings totaled $52.0 million at a rate of 0.27% . At December 31, 2014 , there were no FHLB overnight borrowings. On February 5, 2008, we entered into a ten -year borrowing agreement under the same FHLB line of credit for $15.0 million at a fixed rate of 2.07% , which remained outstanding at December 31, 2015 . Interest-only payments are required every three months until the entire principal is due on February 5, 2018. The FHLB has the unconditional right to accelerate the due date on May 5, 2016 and every three months thereafter (the “put dates”). If the FHLB exercises its right to accelerate the due date, the FHLB will offer replacement funding at the current market rate, subject to certain conditions. We must comply with the put date, but are not required to accept replacement funding. At December 31, 2015 and 2014 , $403.4 million and $435.3 million , respectively, was remaining as available for borrowing from the FHLB, net of the overnight borrowings, term borrowings, and an unused standby letter of credit totaling $241 thousand . Federal Reserve Line of Credit – The Bank has a line of credit with the Federal Reserve Bank ("FRB") secured by certain residential loans. At December 31, 2015 and 2014 , the Bank had borrowing capacity under this line totaling $37.8 million and $27.7 million , respectively, and had no outstanding borrowings with the FRB. As part of the NorCal Acquisition, Bancorp assumed two subordinated debentures due to NorCal Community Bancorp Trusts I and II (the "Trusts"), established for the sole purpose of issuing trust preferred securities on September 22, 2003 and December 29, 2005, respectively. The subordinated debentures were recorded at fair values totaling $4.95 million at acquisition date with contractual values totaling $8.2 million . The difference between the contractual balance and the fair value at acquisition date is accreted into interest expense over the lives of the debentures. Accretion on the subordinated debentures totaled $210 thousand , $216 thousand and $19 thousand in 2015 , 2014 and 2013 , respectively. Bancorp has the option to defer payment of the interest on the subordinated debentures for a period of up to five years, as long as there is no default on the subordinated debentures. In the event of interest deferral, dividends to Bancorp common stockholders are prohibited. The trust preferred securities were sold and issued in private transactions pursuant to an exemption from registration under the Securities Act of 1933, as amended. Bancorp has guaranteed, on a subordinated basis, distributions and other payments due on trust preferred securities totaling $8.0 million issued by the Trusts which have identical maturity, repricing and payment terms as the subordinated debentures. The following is a summary of the contractual terms of the subordinated debentures due to the Trusts as of December 31, 2015 : (in thousands) Subordinated debentures due to NorCal Community Bancorp Trust I on October 7, 2033 with interest payable quarterly, based on 3-month LIBOR plus 3.05%, repricing quarterly (3.37% as of December 31, 2015), redeemable, in whole or in part, on any interest payment date $ 4,124 Subordinated debentures due to NorCal Community Bancorp Trust II on March 15, 2036 with interest payable quarterly, based on 3-month LIBOR plus 1.40%, repricing quarterly (1.91% as of December 31, 2015), redeemable, in whole or in part, on any interest payment date 4,124 Total $ 8,248 Borrowings at December 31, 2015 and 2014 are summarized as follows: 2015 2014 (dollars in thousands) Carrying Value Average Balance Average Rate Carrying Value Average Balance Average Rate FHLB overnight borrowings $ 52,000 $ 784 0.38 % $ — $ 4 — % FHLB fixed-rate advances $ 15,000 $ 15,000 2.07 % $ 15,000 $ 15,000 2.07 % Subordinated debentures $ 5,395 $ 5,288 7.94 % $ 5,185 $ 5,070 8.36 %

Stockholders' Equity and Stock

Stockholders' Equity and Stock Plans	12 Months Ended
	Dec. 31, 2015
Equity [Abstract]
Stockholders' Equity and Stock Plans	Stockholders' Equity and Stock Plans Warrant Under the United States Department of the Treasury Capital Purchase Program (the “TCPP”), Bancorp issued to the U.S. Treasury a warrant to purchase 154,242 shares of common stock at a per share exercise price of $27.23 . The warrant was immediately exercisable and had an expiration date of December 5, 2018. The warrant was subsequently auctioned to two institutional investors in November 2011 and was exercised in September 2015. The warrant represented the right to purchase 157,711 shares of common stock at $26.63 per share. The cashless exercise resulted in the issuance of 70,591 shares of common stock in September 2015. Share-Based Awards On May 11, 2010, our shareholders approved the 2010 Director Stock Plan to pay director fees in shares of Bancorp common stock up to 150,000 shares. In 2015 , 2014 and 2013 , our directors were awarded a total of 5,295 , 5,306 and 5,619 common shares, respectively, from the 2010 Director Stock Plan in addition to their cash compensation. As of December 31, 2015 , 118,965 shares were available for future grants under this plan. On May 8, 2007, the 2007 Equity Plan was approved by the Bank shareholders. The 2007 Equity Plan was subsequently adopted by Bancorp as part of the holding company formation. All new share-based awards from the approval date forward are granted through the 2007 Equity Plan. The 2007 Equity Plan provides financial incentives for selected employees, advisors and non-employee directors. Terms of the plan provide for the issuance of up to 500,000 shares of common stock for these employees, advisors and non-employee directors. As of December 31, 2015 , there were 205,297 shares available for future grants under the 2007 Equity Plan. The Compensation Committee of the Board of Directors has the discretion to determine which employees, advisors and non-employee directors will receive an award, the timing of awards, the vesting schedule for each award, the type of award to be granted, the number of shares of Bancorp stock to be subject to each option and restricted stock award, and any other terms and conditions. Restricted or unrestricted whole-share awards are limited to 250,000 of the total shares available under the 2007 Equity Plan. Effective July 1, 2007, we adopted an Employee Stock Purchase Plan whereby our employees may purchase Bancorp common shares through payroll deductions of between one percent and fifteen percent of pay in each pay period. Shares are purchased quarterly at a five percent discount from the closing market price on the last day of the quarter. The plan calls for 200,000 common shares to be set aside for employee purchases, and there were 193,586 shares available for future grants under the plan as of December 31, 2015 . The inactive 1999 Stock Option Plan covered certain full-time employees and directors who had substantial responsibility for the successful operation of the Bank. Stock options granted pursuant to the 1999 Stock Option Plan were subsequently adopted by Bancorp as part of the holding company formation. Stock options under that plan now relate to shares of common stock of Bancorp. Upon approval of the 2007 Equity Plan, no new awards have been granted under the 1999 Stock Option Plan. Options are issued at an exercise price equal to the fair value of the stock at the date of grant. Options to officers and employees granted prior to January 1, 2006 vested 20% immediately and 20% on each anniversary of the grant date for four years . Options and restricted stock awarded during 2006 through 2014 vest 20% on each anniversary of the grant date for five years. Beginning in 2015, options and restricted stock awards generally vest by approximately 33% on each anniversary of the grant date for three years. All officer and employee options expire ten years from the grant date. Options granted to non-employee directors vest 20% immediately and 20% on each anniversary of the grant date for four years. Director options expire seven years from the grant date. Beginning in 2015, performance-based stock awards were issued to a selected group of employees. Stock award vesting is contingent upon the achievement of pre-established long-term performance goals set by the Compensation Committee of the Board of Directors. Performance is measured over a three -year period and cliff vested. These performance-based stock awards were granted at a maximum opportunity level, and based on the achievement of the pre-established goals, the actual payouts can range from 0% to 200% of the target award. For performance-based stock awards, an estimate is made of the number of shares expected to vest based on the probability that the performance criteria will be achieved to determine the amount of compensation expense to be recognized. The estimate is re-evaluated quarterly and total compensation expense is adjusted for any change in the current period. A summary of activity for stock options for the years ended December 31, 2015 , 2014 and 2013 is presented below. The intrinsic value of options outstanding and exercisable is calculated as the number of in-the-money options times the difference between the market price of our stock as of each year end presented and the exercise prices of the in-the-money options. Weighted Average Weighted Weighted Remaining Average Aggregate Average Contractual Number of Exercise Intrinsic Value Grant-Date Term Shares Price (in thousands) Fair Value (in years) Options outstanding at December 31, 2012 285,533 $ 31.73 $ 1,661 4.43 Granted 30,000 39.99 $ 10.59 Cancelled, expired or forfeited (23,840 ) 35.12 Exercised (71,237 ) 31.13 664 Options outstanding at December 31, 2013 220,456 32.74 2,349 4.05 Exercisable (vested) at December 31, 2013 163,301 31.09 2,008 2.56 Options outstanding at December 31, 2013 220,456 32.74 2,349 4.05 Granted 26,421 44.83 12.04 Cancelled, expired or forfeited (2,790 ) 39.01 Exercised (49,415 ) 29.39 771 Options outstanding at December 31, 2014 194,672 35.14 3,398 4.48 Exercisable (vested) at December 31, 2014 133,153 32.31 2,701 2.88 Options outstanding at December 31, 2014 194,672 35.14 3,398 4.48 Granted 28,320 50.70 12.21 Cancelled, expired or forfeited (652 ) 48.38 Exercised (37,071 ) 30.72 755 Options outstanding at December 31, 2015 185,269 38.35 2,788 5.00 Exercisable (vested) at December 31, 2015 114,581 34.12 2,209 3.21 The following table shows the number, weighted average exercise price, intrinsic value, and weighted average remaining contractual life of options outstanding, vested and expected to vest as of December 31, 2015 . Number of options 179,883 Weighted average exercise price $ 38.14 Aggregate intrinsic value (in thousands) $ 2,745 Weighted average remaining contractual term (in years) 4.91 The following table summarizes non-vested restricted stock awards and changes during the years ended December 31, 2015 , 2014 and 2013 . Restricted Stock Awards Weighted Average Number of Grant-Date Shares Fair Value Non-vested awards at December 31, 2012 21,610 $ 34.05 Granted 11,850 39.96 Vested (6,941 ) 31.42 Forfeited (3,998 ) 36.19 Non-vested awards at December 31, 2013 22,521 37.59 Non-vested awards at December 31, 2013 22,521 $ 37.59 Granted 8,523 45.36 Vested (6,554 ) 34.65 Forfeited (2,067 ) 39.32 Non-vested awards at December 31, 2014 22,423 41.25 Non-vested awards at December 31, 2014 22,423 $ 41.25 Granted 15,970 50.75 Vested (6,555 ) 40.00 Forfeited (450 ) 48.45 Non-vested awards at December 31, 2015 31,388 46.24 As of December 31, 2015 , there was $1.5 million of total unrecognized compensation expense related to non-vested stock options and restricted stock awards. This cost is expected to be recognized over a weighted-average period of approximately 2.3 years . The total grant-date fair value of option shares vested during the years ended December 31, 2015 , 2014 and 2013 was $202 thousand , $182 thousand and $187 thousand , respectively. The total grant-date fair value of restricted stock awards vested during 2015 , 2014 and 2013 was $262 thousand , $227 thousand and $218 thousand , respectively. A summary of the options outstanding and exercisable by price range as of December 31, 2015 is presented in the following table: Stock Options Outstanding as of December 31, 2015 Stock Options Exercisable as of December 31, 2015 Remaining Weighted Weighted Stock Options Contractual Life Average Stock Options Average Range of Exercise Prices Outstanding (in years) Exercise Price Exercisable Exercise Price $20.01 - $25.00 13,138 3.3 $ 22.25 13,138 $ 22.25 $25.01 - $30.00 10,180 2.3 28.75 10,180 28.75 $30.01 - $35.00 41,270 1.3 33.67 41,270 33.67 $35.01 - $40.00 50,630 4.8 37.50 35,663 37.02 $40.01 - $45.00 29,551 6.9 41.95 11,220 41.89 $45.01 - $50.00 12,550 8.3 45.88 2,510 45.88 $45.01 - $50.00 27,950 9.2 50.70 600 50.27 185,269 5.0 38.35 114,581 34.12 The fair value of stock options on the grant date is recorded as a stock-based compensation expense in the consolidated statements of comprehensive income over the requisite service period with a corresponding increase in common stock. Stock-based compensation also includes compensation expense related to the issuance of restricted stock awards pursuant to the 2007 Equity Plan. The grant-date fair value of the restricted stock awards, which equals intrinsic value on that date, is being recorded as compensation expense over the requisite service period with a corresponding increase in common stock as the shares vest. Total compensation cost for these share-based payment arrangements was $636 thousand , $446 thousand and $403 thousand during 2015 , 2014 and 2013 , respectively, and the total recognized tax benefits related thereto were $194 thousand , $128 thousand and $109 thousand , respectively. In addition, we record excess tax benefits, if any, on the exercise of non-qualified stock options, the disqualifying disposition of incentive stock options and vesting of restricted stock awards as an addition to common stock with a corresponding decrease in current taxes payable. The tax benefit realized from disqualifying dispositions of incentive stock options recognized in the consolidated statements of comprehensive income during 2015 , 2014 and 2013 was $49 thousand , $76 thousand and $94 thousand , respectively. We determine the fair value of stock options at the grant date using the Black-Scholes pricing model that takes into account the stock price at the grant date, the exercise price, the expected life of the option, the volatility of the underlying stock, the expected dividend yield and the risk-free interest rate over the expected life of the option. The expected term of options granted is derived from historical data on employee exercise and post-vesting employment termination behavior. The risk-free rate for periods within the expected life of the option is based on the U.S. Treasury yield curve in effect at the time of the grant. Expected volatility is based on the historical volatility of the common stock over the most recent period that is generally commensurate with the expected life of the options. The weighted-average assumptions used in the pricing model are noted in the table below. Years ended December 31, 2015 2014 2013 Risk-free interest rate 1.67 % 2.04 % 1.60 % Expected dividend yield on common stock 1.75 % 1.70 % 1.80 % Expected life in years 6.0 6.0 6.8 Expected price volatility 28.06 % 30.32 % 30.01 % The fair value of the option is expensed on a straight-line basis over the vesting period. Forfeitures are estimated based on historical forfeiture experience and expense is recognized only for those shares expected to vest. The Black-Scholes option valuation model requires the input of highly subjective assumptions, including the expected life of the stock-based award and stock price volatility. The assumptions listed above represent Management's best estimates based on historical information, but these estimates involve inherent uncertainties and the application of Management's judgment. As a result, if other assumptions had been used, the recorded share-based compensation expense could have been materially different from that reflected in these financial statements. If the actual forfeiture rate is materially different from the estimate, the share-based compensation expense could also be materially different. Dividends Presented below is a summary of cash dividends paid to common shareholders, recorded as a reduction of retained earnings. Years ended December 31, (in thousands except per share data) 2015 2014 2013 Cash dividends to common stockholders $ 5,390 $ 4,733 $ 3,970 Cash dividends per common share $ 0.90 $ 0.80 $ 0.73 The holders of the unvested restricted common stock awards are entitled to dividends on the same per-share ratio as the holders of common stock. Dividends paid on the portion of share-based awards not expected to vest are also included in stock-based compensation expense. Tax benefits on dividends paid on the portion of share-based awards expected to vest are recorded as an increase to common stock with a corresponding decrease in current taxes payable. Under the California Corporations Code effective January 1, 2012, payment of dividends by Bancorp is restricted to the amount of retained earnings immediately prior to the distribution or the amount of assets that exceeds the total liabilities immediately after the distribution. As of December 31, 2015 , Bancorp's retained earnings and the amount of assets that exceeds the total liabilities were $129.6 million and $214.5 million , respectively. Under the California Financial Code, payment of dividends by the Bank to Bancorp is restricted to the lesser of retained earnings or the amount of undistributed net profits of the Bank from the three most recent fiscal years. Under this restriction, approximately $20.5 million of the Bank's retained earnings balance was available for payment of dividends to Bancorp as of December 31, 2015 . Bancorp held $3.8 million in cash at December 31, 2015 . This cash, combined with the $20.5 million dividends available to be distributed from the Bank, is expected to be adequate to cover Bancorp's estimated operational needs and cash dividends to shareholders for 2016. Preferred Stock and Shareholder Rights Plan On July 2, 2007, Bancorp executed a shareholder rights agreement (“Rights Agreement”) designed to discourage takeovers that involve abusive tactics or do not provide fair value to shareholders. As of December 31, 2015 , Bancorp was also authorized to issue five million shares of preferred stock with no par value under the Rights Agreement. In the event of a proposed merger, tender offer or other attempt to gain control of Bancorp that the Board of Directors does not approve, it might be possible for the Board of Directors to authorize the issuance of shares of common or preferred stock that would impede the completion of such a transaction. An effect of the possible issuance of common or preferred stock, therefore, may be to deter a future takeover attempt. The Board of Directors has no present plans or understandings for the issuance of any common or preferred stock in connection with the Rights Agreement.

Fair Value of Assets and Liabil

Fair Value of Assets and Liabilities	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value of Assets and Liabilities	Fair Value of Assets and Liabilities Fair Value Hierarchy and Fair Value Measurement We group our assets and liabilities that are measured at fair value in three levels within the fair value hierarchy, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. These levels are: Level 1: Valuations are based on unadjusted quoted prices in active markets for identical assets or liabilities. Level 2: Valuations are based on quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active and model-based valuations for which all significant assumptions are observable or can be corroborated by observable market data. Level 3: Valuations are based on unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Values are determined using pricing models and discounted cash flow models and may include significant Management judgment and estimation. Transfers between levels of the fair value hierarchy are recognized through our monthly and/or quarterly valuation process in the reporting period during which the event or circumstances that caused the transfer occurred. The following table summarizes our assets and liabilities that were required to be recorded at fair value on a recurring basis. (in thousands) Description of Financial Instruments Carrying Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) December 31, 2015 Securities available-for-sale: Mortgage-backed securities and collateralized mortgage obligations issued by U.S. government-sponsored agencies $ 190,093 $ — $ 188,381 $ 1,712 Debentures of government-sponsored agencies $ 160,892 $ — $ 160,892 $ — Privately-issued collateralized mortgage obligations $ 4,150 $ — $ 4,150 $ — Obligations of state and political subdivisions $ 57,673 $ — $ 57,673 $ — Corporate bonds $ 4,979 $ — $ 4,979 $ — Derivative financial assets (interest rate contracts) $ 3 $ — $ 3 $ — Derivative financial liabilities (interest rate contracts) $ 1,658 $ — $ 1,658 $ — December 31, 2014 Securities available-for-sale: Mortgage-backed securities and collateralized mortgage obligations issued by U.S. government-sponsored agencies $ 158,119 $ — $ 155,421 $ 2,698 Debentures of government-sponsored agencies $ 14,557 $ — $ 14,557 $ — Privately-issued collateralized mortgage obligations $ 7,294 $ — $ 7,294 $ — Obligations of state and political subdivisions $ 15,880 $ — $ 15,771 $ — Corporate bonds $ 4,998 $ — $ 5,437 $ — Derivative financial assets (interest rate contracts) $ 61 $ — $ 61 $ — Derivative financial liabilities (interest rate contracts) $ 1,996 $ — $ 1,996 $ — Securities available-for-sale are recorded at fair value on a recurring basis. When available, quoted market prices (Level 1) are used to determine the fair value of securities available-for-sale. If quoted market prices are not available, we obtain pricing information from a reputable third-party service provider, who may utilize valuation techniques that use current market-based or independently sourced parameters, such as bid/ask prices, dealer-quoted prices, interest rates, benchmark yield curves, prepayment speeds, probability of default, loss severity and credit spreads (Level 2). Level 2 securities include obligations of state and political subdivisions, U.S. agencies or government sponsored agencies' debt securities, mortgage-backed securities, government agency-issued and privately-issued collateralized mortgage obligations. As of December 31, 2015 and 2014, there are no securities that are considered Level 1 securities. As of December 31, 2015 , we have one available-for-sale security that is considered Level 3 security. The security is a U.S. government agency obligation collateralized by a small pool of business equipment loans guaranteed by the Small Business Administration program. This security is not actively traded and is owned by a few investors. The significant unobservable data reflected in the fair value measurement include dealer quotes, projected prepayment speeds/average lives and credit information, among other things. It was transferred to Level 3 during the second quarter of 2014. During 2015, the decrease in unrealized gain was $7 thousand . Securities held-to-maturity may be written down to fair value (determined using the same techniques discussed above for securities available-for-sale) as a result of an other-than-temporary impairment, if any. On a recurring basis, derivative financial instruments are recorded at fair value, which is based on the income approach using observable Level 2 market inputs, reflecting market expectations of future interest rates as of the measurement date. Standard valuation techniques are used to calculate the present value of the future expected cash flows assuming an orderly transaction. Valuation adjustments may be made to reflect both our own credit risk and the counterparties’ credit quality in determining the fair value of derivatives. Level 2 inputs for the valuations are limited to observable market prices for London Interbank Offered Rate (“LIBOR”) and Overnight Index Swap ("OIS") rates (for the very short term), quoted prices for LIBOR futures contracts, observable market prices for LIBOR and OIS swap rates, and one-month and three-month LIBOR basis spreads at commonly quoted intervals. Mid-market pricing of the inputs is used as a practical expedient in the fair value measurements. We project spot rates at reset days specified by each swap contract to determine future cash flows, then discount to present value using either LIBOR or OIS curves depending on the collateral posted as of the measurement date. When the value of any collateral placed with counterparties is less than the interest rate derivative liability, a credit valuation adjustment ("CVA") is applied to reflect the credit risk we pose to counterparties. We have used the spread between the Standard & Poor's BBB rated U.S. Bank Composite rate and LIBOR for the closest maturity term corresponding to the duration of the swaps to derive the CVA. A similar credit risk adjustment, correlated to the credit standing of the counterparty, is made when collateral posted by the counterparty does not fully cover their liability to Bank of Marin. For further discussion on our methodology in valuing our derivative financial instruments, refer to Note 15. Certain financial assets may be measured at fair value on a non-recurring basis. These assets are subject to fair value adjustments that result from the application of the lower of cost or fair value accounting or write-downs of individual assets, such as impaired loans and other real estate owned ("OREO"). The following table presents the carrying value of financial instruments that were measured at fair value on a non-recurring basis and were still held in the consolidated statements of condition at each respective period end, by level within the fair value hierarchy as of December 31, 2015 and 2014 . (in thousands) Description of Financial Instruments Carrying Value 1 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) 1 December 31, 2015 Other real estate $ 421 $ — $ — $ 421 December 31, 2014 Impaired loans carried at fair value: Installment and other consumer 1 $ 77 $ — $ — $ 77 Other real estate $ 461 $ — $ — $ 461 1 Represents collateral-dependent loan principal balances that had been generally written down to the values of the underlying collateral, net of specific valuation allowances. At December 31, 2014, the $77 thousand carrying value of a consumer loan was net of a $26 thousand specific valuation allowance. The carrying value of loans fully charged-off, which includes unsecured lines of credit, overdrafts and all other loans, is zero. When a loan is identified as impaired, it is reported at the lower of cost or fair value, measured based on the loan's observable market price (Level 1) or the current net realizable value of the underlying collateral securing the loan, if the loan is collateral dependent (Level 3). Net realizable value of the underlying collateral is the fair value of the collateral less estimated selling costs and any prior liens. Appraisals, recent comparable sales, offers and listing prices are factored in when valuing the collateral. We review and verify the qualifications and licenses of the certified general appraisers used for appraising commercial properties or certified residential appraisers for residential properties. Real estate appraisals may utilize a combination of approaches including replacement cost, sales comparison and the income approach. Comparable sales and income data are analyzed by the appraisers and adjusted to reflect differences between them and the subject property such as type, leasing status and physical condition. When appraisals are received, Management reviews the assumptions and methodology utilized in the appraisal as well as the overall resulting value in conjunction with independent data sources such as recent market data and industry-wide statistics. We generally use a 6% discount for selling costs which is applied to all properties, regardless of size. Appraised values may be adjusted to reflect changes in market conditions that have occurred subsequent to the appraisal date, or for revised estimates regarding the timing or cost of the property sale. These adjustments are based on qualitative judgments made by Management on a case-by-case basis and are generally unobservable valuation inputs as they are specific to each underlying collateral. There have been no significant changes in the valuation techniques during the period ended December 31, 2015 . OREO represents collateral acquired through foreclosure and is initially recorded at fair value as established by a current appraisal, adjusted for disposition costs. Subsequently, OREO is measured at lower of cost or fair value. OREO values are reviewed on an ongoing basis and any subsequent decline in fair value is recorded as a foreclosed asset expense in the current period. The value of OREO is determined based on independent appraisals, similar to the process used for impaired loans, discussed above, and is classified as Level 3. There was a $40 thousand decline in the estimated fair value of the OREO during the year ended December 31, 2015 . The OREO was acquired from Bank of Alameda as part of the NorCal Acquisition. Disclosures about Fair Value of Financial Instruments The table below is a summary of fair value estimates for financial instruments as of December 31, 2015 and 2014 , excluding financial instruments recorded at fair value on a recurring basis (summarized in the first table in this note). The carrying amounts in the following table are recorded in the consolidated statements of condition under the indicated captions. We have excluded non-financial assets and non-financial liabilities defined by the Codification (ASC 820-10-15-1A), such as Bank premises and equipment, deferred taxes and other liabilities. In addition, we have not disclosed the fair value of financial instruments specifically excluded from disclosure requirements of the Financial Instruments Topic of the Codification (ASC 825-10-50-8), such as Bank-owned life insurance policies. December 31, 2015 December 31, 2014 (in thousands) Carrying Amounts Fair Value Fair Value Hierarchy Carrying Amounts Fair Value Fair Value Hierarchy Financial assets: Cash and cash equivalents $ 26,343 $ 26,343 Level 1 $ 41,367 $ 41,367 Level 1 Investment securities held-to-maturity 69,637 71,054 Level 2 116,437 118,643 Level 2 Loans, net 1,436,229 1,470,380 Level 3 1,348,252 1,361,244 Level 3 Interest receivable 6,643 6,643 Level 2 5,909 5,909 Level 2 Financial liabilities: Deposits 1,728,226 1,728,717 Level 2 1,551,619 1,552,446 Level 2 Federal Home Loan Bank borrowing 67,000 67,279 Level 2 15,000 15,484 Level 2 Subordinated debentures 5,395 5,132 Level 3 5,185 5,290 Level 3 Interest payable 187 187 Level 2 213 213 Level 2 Following is a description of methods and assumptions used to estimate the fair value of each class of financial instrument not recorded at fair value but required for disclosure purposes: Cash and Cash Equivalents - The carrying amounts of cash and cash equivalents approximate their fair value because of the short-term nature of these instruments. Held-to-maturity Securities - Held-to-maturity securities, which generally consist of obligations of state and political subdivisions and corporate bonds, are recorded at their amortized cost. Their fair value for disclosure purposes is determined using methodologies similar to those described above for available-for-sale securities using Level 2 inputs. If Level 2 inputs are not available, we may utilize pricing models that incorporate unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities (Level 3). As of December 31, 2015 and 2014 , we did not hold any securities whose fair value was measured using significant unobservable inputs. Loans - The fair value of loans with variable interest rates approximates their current carrying value, because their rates are regularly adjusted to current market rates. The fair value of fixed rate loans or variable loans at negotiated interest rate floors or ceilings with remaining maturities in excess of one year is estimated by discounting the future cash flows using current market rates at which similar loans would be made to borrowers with similar credit worthiness and similar remaining maturities. The allowance for loan losses (“ALLL”) is considered to be a reasonable estimate of the portion of loan discount attributable to credit risks. Interest Receivable and Payable - The interest receivable and payable balances approximate their fair value due to the short-term nature of their settlement dates. Deposits - The fair value of deposits without stated maturity, such as transaction accounts, savings accounts and money market accounts, is the amount payable on demand at the reporting date. The fair value of time deposits is estimated by discounting the future cash flows using current rates offered for deposits of similar remaining maturities. Federal Home Loan Bank Borrowing - The fair value is estimated by discounting the future cash flows using current rates offered by the Federal Home Loan Bank of San Francisco ("FHLB") for similar credit advances corresponding to the remaining duration of our fixed-rate borrowing. Subordinated Debentures - As part of the NorCal Acquisition, we assumed two subordinated debentures. See Notes 2 and 8 for further information. The fair values of the subordinated debentures were estimated by discounting the future cash flows (interest payment at a rate of forward three-month LIBOR plus 3.05% and 1.40% , respectively) to their present values using current market rates at which similar bonds would be issued with similar credit ratings as ours and similar remaining maturities. Each payment was discounted at a spot rate of the corresponding term, determined based on the yields and terms of comparable trust preferred securities, plus a liquidity premium. In July 2010, the Dodd-Frank Act was signed into law and limits the ability of certain bank holding companies to treat trust preferred security debt issuances as Tier 1 capital. This law effectively closed the trust-preferred securities markets for new issuance and led to the absence of observable or comparable transactions in the market place. Due to the unobservable inputs of trust preferred securities, we consider the fair value to be a Level 3 measurement. Commitments - The value of unrecognized financial instruments is estimated based on the fee income associated with the commitments which, in the absence of credit exposure, is considered to approximate their settlement value. The fair value of commitment fees was not material as of December 31, 2015 and 2014 , respectively.

Benefit Plans

Benefit Plans	12 Months Ended
	Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Benefit Plans	Benefit Plans In 2003, we established a Deferred Compensation Plan that allows certain key management personnel designated by the Board of Directors of the Bank to defer up to 80% of their salary and 100% of their annual bonus. The plan was amended in 2007 in order to comply with the most recent Internal Revenue Code Section 409A changes. Under the amended plan, amounts deferred earn interest that is equal to the prime rate as published in the Wall Street Journal, on the first business day of the year, which remained unchanged at 3.25% on January 1, 2015, 2014 and 2013. In January 2016, the crediting rate increased to 3.50% . Our deferred compensation obligation totaled $3.0 million and $2.9 million at December 31, 2015 and 2014 , respectively, and is included in interest payable and other liabilities. Our 401(k) Defined Contribution Plan (the “401(k) Plan”) commenced in May 1990 and is available to all regular employees at least eighteen years of age who complete ninety days of service, and enter the plan during one of the four open enrollment dates (January 1, April 1, July 1, and October 1) of each year. Under the 401(k) Plan, employees can defer between 1% and 50% of their eligible compensation, up to the maximum amount allowed by the Internal Revenue Code. Contributions to the 401 (k) Plan for the employer match are vested at a rate of 20% per year over a five year period. The Bank matched 50% of each participant's contribution prior to 2013 at which time the Bank increased the match to 60% , with a maximum of $4 thousand annually. Employer contributions totaled $555 thousand , $548 thousand and $473 thousand for the years ended December 31, 2015 , 2014 and 2013 , respectively. In 1999, the 401(k) Plan was amended to include an employee stock ownership component and was renamed the Bank of Marin Employee Stock Ownership and Savings Plan (the “Plan”). Under the terms of the Plan, as amended, the Board of Directors determines a specific portion of the Bank's profits to be contributed to the employee stock ownership each year either in common stock or in cash for the purchase of Bancorp stock to be allocated to all eligible employees based on a percentage of their salaries, regardless of whether an employee is participating in the 401(k) plan or not. In January 2010, the Bank of Marin Employee Stock Ownership and Savings Plan was split into two plans: Bank of Marin 401(k) Plan and Bank of Marin Employee Stock Ownership Plan ("ESOP"). The same eligibility criteria apply under the ESOP, while employees' contributions are not permitted. For all participants, employer contributions vest over a five year period of service. After five years of service, all past and future employer contributions vest immediately. The Bank contributed cash in the amount of $1.1 million for the year ended December 31, 2015 , $1.2 million in 2014, and $886 thousand in 2013, to the ESOP, which purchased Bancorp stock from the open market or private parties. Cash dividends paid on Bancorp stock held by the ESOP are used to purchase additional shares in the open market. All shares of Bancorp stock held by the ESOP are included in the calculations of basic and diluted earnings per share. The employer contributions to the ESOP and the 401(k) Plan are included in salaries and benefits expense. On January 1, 2011, we established a Salary Continuation Plan for a select group of Executive Management, who will receive twenty-five percent of their estimated salary at retirement as salary continuation benefit payments upon retirement. Each participant will need to participate in this plan for five years before vesting begins. After five years, the participant will vest ratably in the benefit over the remaining period until age 65 . This Plan is unfunded and nonqualified for tax purposes and for purposes of Title I of the Employee Retirement Income Security Act of 1974. Our liability under the Salary Continuation Plan was $823 thousand and $644 thousand recorded in interest payable and other liabilities at December 31, 2015 and 2014 , respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The current and deferred components of the income tax provision for each of the three years ended December 31 are as follows: (in thousands) 2015 2014 2013 Current tax provision Federal $ 7,097 $ 8,523 $ 6,717 State 2,931 3,195 2,574 Total current 10,028 11,718 9,291 Deferred tax provision (benefit) Federal 382 (146 ) (873 ) State 80 126 (479 ) Total deferred 462 (20 ) (1,352 ) Total income tax provision $ 10,490 $ 11,698 $ 7,939 The following table shows the tax effect of our cumulative temporary differences as of December 31: (in thousands) 2015 2014 Deferred tax assets: Allowance for loan losses and off-balance sheet credit commitments $ 5,918 $ 5,544 Net operating loss carryforwards from the NorCal Acquisition 4,090 4,598 Deferred compensation plan and salary continuation plan 1,619 1,499 Fair value adjustment on loans acquired from the NorCal Acquisition 1,197 1,647 Accrued but unpaid expenses 1,188 1,119 State franchise tax 1,005 1,100 Interest received on non-accrual loans 864 651 Deferred rent and other lease incentives 595 584 Other real estate owned 448 448 Stock-based compensation 273 231 Depreciation and disposals on premises and equipment 231 94 Accretion on loans and investment securities 110 630 Net unrealized loss on securities available-for-sale 59 — Other 174 195 Total gross deferred tax assets 17,771 18,340 Deferred tax liabilities: Deferred loan origination costs and fees (2,567 ) (2,385 ) Core deposit intangible asset (1,309 ) (1,569 ) Unaccreted discount on subordinated debentures from the NorCal Acquisition (1,200 ) (1,288 ) Net unrealized gain on securities available-for-sale — (498 ) Total gross deferred tax liabilities (5,076 ) (5,740 ) Net deferred tax assets $ 12,695 $ 12,600 As of December 31, 2015 , we had Federal and California net operating loss carryforwards ("NOLs") from the NorCal Acquisition of approximately $7.6 million and $21.3 million , respectively. If not fully utilized, the federal NOLs will begin to expire in 2029, and the California NOLs will begin to expire in 2028. The acquisition resulted in limitations on the annual utilization of these NOLs under section 382 of the Internal Revenue Code. Although we expect to fully utilize all of the federal NOLs prior to their expiration, $819 thousand of California NOLs are expected to expire unutilized in 2031. As a result, we wrote down $58 thousand of deferred tax assets associated with these California NOLs as part of the purchase accounting adjustments in 2013. Based upon the level of historical taxable income and projections for future taxable income over the periods during which the deferred tax assets are expected to be deductible, Management believes it is more likely than not we will realize the benefit of the remaining deferred tax assets. Accordingly, no other valuation allowance has been established as of December 31, 2015 or 2014 . The effective tax rate for 2015 , 2014 and 2013 differs from the current Federal statutory income tax rate as follows: 2015 2014 2013 Federal statutory income tax rate 35.0 % 35.0 % 35.0 % Increase (decrease) due to: California franchise tax, net of federal tax benefit 6.8 % 6.8 % 6.5 % Tax exempt interest on municipal securities and loans (4.2 )% (3.3 )% (4.0 )% Tax exempt earnings on bank owned life insurance (1.0 )% (0.9 )% (1.5 )% Low income housing tax credits (0.2 )% (0.1 )% (0.3 )% Other (0.1 )% (0.3 )% — % Effective Tax Rate 36.3 % 37.2 % 35.7 % Bancorp and the Bank have entered into a tax allocation agreement which provides that income taxes shall be allocated between the parties on a separate entity basis. The intent of this agreement is that each member of the consolidated group will incur no greater tax liability than it would have incurred on a stand-alone basis. We file a consolidated return in the U.S. Federal tax jurisdiction and a combined return in the State of California tax jurisdiction. There were no ongoing federal or state income tax examinations at the issuance of this report. In June 2015, the State of California completed its examination of the 2011 and 2012 corporate income tax returns, resulting in a minor adjustment. At December 31, 2015 and 2014, neither the Bank nor Bancorp had accruals for interest and penalties related to unrecognized tax benefits.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies We rent certain premises and equipment under long-term, non-cancelable operating leases expiring at various dates through the year 2028. Most of the leases contain certain renewal options and escalation clauses. At December 31, 2015, the approximate minimum future commitments payable under non-cancelable contracts for leased premises are as follows: (in thousands) 2016 2017 2018 2019 2020 Thereafter Total Operating leases 1 $ 3,763 $ 3,755 $ 3,784 $ 3,526 $ 3,018 $ 3,659 $ 21,505 1 Minimum payments have not been reduced by minimum sublease rentals of $248 thousand due in the future under non-cancelable subleases. Rent expense included in occupancy expense totaled $4.2 million in 2015 and 2014 , and $3.3 million in 2013 . We may be party to legal actions which arise from time to time as part of the normal course of our business. We believe, after consultation with legal counsel, that we have meritorious defenses in these actions, and that litigation contingent liability, if any, will not have a material adverse effect on our financial position, results of operations, or cash flows. We are responsible for our proportionate share of certain litigation indemnifications provided to Visa U.S.A. ("Visa") by its member banks in connection with lawsuits related to anti-trust charges and interchange fees ("Covered Litigation"). Visa Inc. maintains an escrow account from which settlements of, or judgments in, the Covered Litigation are paid. While the accrual related to the Covered Litigation could be higher or lower than the litigation escrow account balance, Visa did not record an additional accrual for the Covered Litigation during 2015. At December 31, 2015, the balance of the escrow account was $1.0 billion . According to the latest SEC Form 10-Q filed by VISA, Inc. on January 28, 2016, Visa has reached settlement agreements with a number of opt-out merchants. They represent approximately 49% of the Visa-branded payment card sales volume of merchants who opted out of interchange multidistrict litigation class settlement agreement, under which an estimated $4.0 billion is due to the class plaintiffs. The conversion rate of Visa Class B common stock held by us to Class A common stock (as discussed in Note 3) may decrease if Visa makes more Covered Litigation settlement payments in the future, and the full effect on member banks is still uncertain. However, we are not aware of significant future cash settlement payments required by us on the Covered Litigation. As permitted or required under California law and to the maximum extent allowable under that law, we have certain obligations to indemnify our current and former officers and directors for certain events or occurrences while the officer or director is, or was, serving at our request in such capacity. These indemnification obligations are valid as long as the director or officer acted in good faith and in a manner the person reasonably believed to be in or not opposed to the best interests of the corporation, and, with respect to any criminal action or proceeding, had no reasonable cause to believe his or her conduct was unlawful. The maximum potential amount of future payments we could be required to make under these indemnification obligations is unlimited; however, we have a director and officer insurance policy that mitigates our exposure and enables us to recover a portion of any future amounts paid. We believe the estimated fair value of these indemnification obligations is minimal.

Concentrations of Credit Risk

Concentrations of Credit Risk	12 Months Ended
	Dec. 31, 2015
Risks and Uncertainties [Abstract]
Concentrations of Credit Risk	Concentrations of Credit Risk Concentration of credit risk is the risk associated with a lack of diversification, such as having substantial investments in a few individual issuers, thereby exposing us to greater risks resulting from adverse economic, political, regulatory, geographic, industrial or credit developments. Financial instruments that potentially subject us to concentrations of credit risk consist primarily of cash and cash equivalents, investment securities and loans. Our cash in correspondent bank accounts, at times, may exceed FDIC insured limits. We place cash and cash equivalents with high quality financial institutions, periodically monitor their credit worthiness and limit the amount of credit exposure with any one institution. Concentrations of credit risk with respect to investment securities are limited to the U.S. Government, its agencies and Government Sponsored Enterprises ("GSEs"). Our exposure, which primarily results from positions in securities issued by the U.S. Government, its agencies, and GSEs was $362.6 million , or 74% of our total investment portfolio at December 31, 2015 and $185.4 million , or 58% at December 31, 2014. We also manage our credit exposure related to our loan portfolio to avoid the risk of undue concentration of credits in a particular industry by reducing significant exposure to highly leveraged transactions or to any individual customer or counterparty, and by obtaining collateral as appropriate. No individual borrower accounts for more than 5% of loans held in the portfolio. The largest loan concentration group by industry of the borrowers is real estate, which accounts for 80% of our loan portfolio at both December 31, 2015 and 2014.

Derivative Financial Instrument

Derivative Financial Instruments and Hedging Activities	12 Months Ended
	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments and Hedging Activities	Derivative Financial Instruments and Hedging Activities We have entered into interest rate swap agreements, primarily as an asset/liability management strategy, in order to mitigate the changes in the fair value of specified long-term fixed-rate loans (or firm commitments to enter into long-term fixed-rate loans) caused by changes in interest rates. These hedges allow us to offer long-term fixed rate loans to customers without assuming the interest rate risk of a long-term asset. Converting our fixed-rate interest payments to floating-rate interest payments, generally benchmarked to the one-month U.S. dollar LIBOR index, protects us against changes in the fair value of our loans associated with fluctuating interest rates. The fixed-rate payment features of the interest rate swap agreements are generally structured at inception to mirror substantially all of the provisions of the hedged loan agreements. These interest rate swaps, designated and qualified as fair value hedges, are carried on the consolidated statements of condition at their fair value in other assets (when the fair value is positive) or in other liabilities (when the fair value is negative). The unrealized gain or loss in fair value of the hedged fixed-rate loan due to LIBOR interest rate movements is recorded as an adjustment to the hedged loan. From time to time, we make firm commitments to enter into long-term fixed-rate loans with borrowers backed by yield maintenance agreements and simultaneously enter into forward interest rate swap agreements with correspondent banks to mitigate the change in fair value of the yield maintenance agreement. Prior to loan funding, yield maintenance agreements with net settlement features that meet the definition of a derivative are considered as non-designated hedges and are carried on the consolidated statements of condition at their fair value in other assets (when the fair value is positive) or in other liabilities (when the fair value is negative). The offsetting changes in the fair value of the forward swap and the yield maintenance agreement are recorded in interest income . When the fixed-rate loans are originated, the forward swaps are designated to offset the change in fair value in the loans. Subsequent to the point of the swap designations, the related yield maintenance agreements are no longer considered derivatives. Their fair value at the designation date was recorded in other assets and is amortized using the effective yield method over the life of the respective designated loans. The net effect of the change in fair value of interest rate swaps, the amortization of the yield maintenance agreement and the change in the fair value of the hedged loans result in an insignificant amount of hedge ineffectiveness recognized in interest income . Our credit exposure, if any, on interest rate swaps is limited to the favorable value (net of any collateral pledged to us) and interest payments of all swaps by each counterparty. Conversely, when an interest rate swap is in a liability position exceeding a certain threshold, we may be required to post collateral to the counterparty in an amount determined by the agreements. Collateral levels are monitored and adjusted on a regular basis for changes in interest rate swap values. As of December 31, 2015 , we had seven interest rate swap agreements, which are scheduled to mature in June 2020, August 2020, June 2031, October 2031, July 2032, August 2037 and October 2037. All of our derivatives are accounted for as fair value hedges. Our interest rate swaps are settled monthly with counterparties. Accrued interest on the swaps totaled $28 thousand and $41 thousand as of December 31, 2015 and December 31, 2014 , respectively. Information on our derivatives follows: Asset derivatives Liability derivatives (in thousands) December 31, 2015 December 31, 2014 December 31, 2015 December 31, 2014 Fair value hedges: Interest rate contracts notional amount $ 4,407 $ 4,589 $ 22,187 $ 26,899 Interest rate contracts fair value 1 $ 3 $ 61 $ 1,658 $ 1,996 Years ended December 31, (in thousands) 2015 2014 2013 Increase (decrease) in value of designated interest rate swaps recognized in interest income $ 280 $ (377 ) $ 3,680 Payment on interest rate swaps recorded in interest income (918 ) (1,002 ) (1,422 ) Decrease (increase) in value of hedged loans recognized in interest income (308 ) 662 (3,971 ) Decrease in value of yield maintenance agreement recognized against interest income (52 ) (91 ) (71 ) Net loss on derivatives recognized against interest income 2 $ (998 ) $ (808 ) $ (1,784 ) 1 See Note 10 for valuation methodology. 2 Includes hedge ineffectiveness loss of $80 thousand , gain of $194 thousand and loss of $362 thousand for the years December 31, 2015 , 2014 and 2013 , respectively. Changes in value of swaps were included in the assessment of hedge effectiveness. Hedge ineffectiveness is the measure of the extent to which the change in the fair value of the hedging instruments does not offset the change in the fair value of the hedged item. Our derivative transactions with counterparties are under International Swaps and Derivative Association (“ISDA”) master agreements that include “right of set-off” provisions. “Right of set-off” provisions are legally enforceable rights to offset recognized amounts and there may be an intention to settle such amounts on a net basis. We do not offset such financial instruments for financial reporting purposes. Information on financial instruments that are eligible for offset in the consolidated statements of condition follows: Offsetting of Financial Assets and Derivative Assets Gross Amounts Not Offset in the Statements of Condition Gross Amounts Net Amounts Gross Amounts Offset in the of Assets Presented of Recognized Statements of in the Statements Financial Cash Collateral (in thousands) Assets 1 Condition of Condition 1 Instruments Received Net Amount As of December 31, 2015 Derivatives by Counterparty Counterparty A $ 3 $ — $ 3 $ (3 ) $ — $ — Counterparty B — — — — — — Total $ 3 $ — $ 3 $ (3 ) $ — $ — As of December 31, 2014 Derivatives by Counterparty Counterparty A $ 61 $ — $ 61 $ (61 ) $ — $ — Counterparty B — — — — — — Total $ 61 $ — $ 61 $ (61 ) $ — $ — 1 Amounts exclude accrued interest totaling $1 thousand at both December 31, 2015 and December 31, 2014, respectively. Offsetting of Financial Liabilities and Derivative Liabilities Gross Amounts Not Offset in the Statements of Condition Gross Amounts Net Amounts of Gross Amounts Offset in the Liabilities Presented of Recognized Statements of in the Statements of Financial Cash Collateral (in thousands) Liabilities 2 Condition Condition 2 Instruments Pledged Net Amount As of December 31, 2015 Derivatives by Counterparty Counterparty A $ 1,390 $ — $ 1,390 $ (3 ) (1,387 ) $ — Counterparty B 268 — 268 — (268 ) — Total $ 1,658 $ — $ 1,658 $ (3 ) $ (1,655 ) $ — As of December 31, 2014 Derivatives by Counterparty Counterparty A $ 1,616 $ — $ 1,616 $ (61 ) $ (1,360 ) $ 195 Counterparty B 380 — 380 — (380 ) — Total $ 1,996 $ — $ 1,996 $ (61 ) $ (1,740 ) $ 195 2 Amounts exclude accrued interest totaling $27 thousand and $39 thousand at December 31, 2015 and December 31, 2014, respectively.

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2015
Banking and Thrift [Abstract]
Regulatory Matters	Regulatory Matters We are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a material effect on our consolidated financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, we must meet specific capital guidelines that involve quantitative measures of our assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. The capital amounts and the Bank’s prompt corrective action classification are also subject to qualitative judgments by the regulators about components of capital, risk weightings and other factors. Quantitative measures established by regulation to ensure capital adequacy require Bancorp and the Bank to maintain minimum amounts and ratios (set forth in the table below) of total and Tier 1 capital to risk-weighted assets and of Tier 1 capital to quarterly average assets. Capital ratios are reviewed by Management on a regular basis to ensure that capital exceeds the prescribed regulatory minimums and is adequate to meet our anticipated future needs. For all periods presented, the Bank’s ratios exceed the regulatory definition of “well capitalized” under the regulatory framework for prompt corrective action and Bancorp’s ratios exceed the required minimum ratios for capital adequacy purposes. In July 2013, the Board of Governors of the Federal Reserve, the FDIC and the Office of the Comptroller of the Currency, finalized regulatory capital rules known as “Basel III.” The rules became effective beginning January 2015, and will be phased-in and become fully implemented by January 2019. The guidelines, among other things, changed the minimum capital requirements of bank holding companies, by increasing the Tier 1 capital to risk-weighted assets ratio to 6% , and introducing a new requirement to maintain a minimum ratio of common equity Tier 1 capital to risk-weighted assets of 4.5% . By 2019, when fully phased in, the rules will require further increases to certain minimum capital requirements and a capital conservation buffer of an additional 2.5% of risk-weighted assets. Basel III permits certain banks such as us to exclude accumulated other comprehensive income or loss from regulatory capital through a one-time election in the first quarter of 2015. As it was consistent with our existing treatment, there were no changes to our capital ratios as a result of making this election. The changes that affected us most significantly include: • shifting off-balance sheet items with an original maturity of one year or less from 0% to 20% risk weight, • moving past due loan balances from 100% to 150% risk weight, • deducting deferred tax assets associated with NOLs and tax credits from common equity Tier 1 capital, and • subjecting deferred tax assets related to temporary timing differences that exceed certain thresholds to 250% risk-weighting, beginning in 2018. We have modeled our ratios under fully phased-in Basel III rules and, based on present facts, we do not expect that we will be required to raise additional capital as a result of the fully phased-in rules. To be categorized as well capitalized the Bank must maintain minimum total risk-based, Tier 1 risk-based, Tier 1 leverage, and common equity Tier 1 ratios as set forth in the second table below. The most recent notification from the FDIC categorized the Bank as well capitalized under the regulatory framework for prompt corrective action as of December 31, 2015. There are no conditions or events since that notification that Management believes have changed the Bank’s categories and we expect the Bank to remain well capitalized under the minimum requirements for capital adequacy in accordance with Basel III rules for prompt corrective action pursuant to Section 38 of the Federal Deposit Insurance Act on a fully phased-in basis. The Bancorp’s and Bank's capital adequacy ratios as of December 31, 2015 and 2014 are presented in the following tables. Bancorp's Tier 1 capital includes the subordinated debentures, which are not included at the Bank level. We continued to deploy capital in 2015 accumulated from net income into lending and investing. Capital Ratios for Bancorp (dollars in thousands) Actual Ratio Ratio for Capital Adequacy Purposes As of December 31, 2015 Amount Ratio Amount Ratio Total Capital (to risk-weighted assets) $ 227,269 13.37 % ≥ $ 135,996 ≥ 8.0 % Tier 1 Capital (to risk-weighted assets) $ 211,521 12.44 % ≥ $ 101,997 ≥ 6.0 % Tier 1 Capital (to average assets) $ 211,521 10.67 % ≥ $ 79,296 ≥ 4.0 % Common Equity Tier 1 (to risk-weighted assets) $ 206,724 12.16 % ≥ $ 76,498 ≥ 4.5 % As of December 31, 2014 Total Capital (to risk-weighted assets) $ 210,067 13.94 % ≥ $ 120,580 ≥ 8.0 % Tier 1 Capital (to risk-weighted assets) $ 193,956 12.87 % ≥ $ 60,290 ≥ 4.0 % Tier 1 Capital (to average assets) $ 193,956 10.62 % ≥ $ 73,079 ≥ 4.0 % Capital Ratios for the Bank (dollars in thousands) Actual Ratio Ratio for Capital Adequacy Purposes Ratio to be Well Capitalized under Prompt Corrective Action Provisions As of December 31, 2015 Amount Ratio Amount Ratio Amount Ratio Total Capital (to risk-weighted assets) $ 222,830 13.11 % ≥ $ 135,968 ≥ 8.0 % ≥ $ 169,960 ≥ 10.0 % Tier 1 Capital (to risk-weighted assets) $ 207,082 12.18 % ≥ $ 101,976 ≥ 6.0 % ≥ $ 135,968 ≥ 8.0 % Tier 1 Capital (to average assets) $ 207,082 10.45 % ≥ $ 79,268 ≥ 4.0 % ≥ $ 99,085 ≥ 5.0 % Common Equity Tier 1 (to risk-weighted assets) $ 207,082 12.18 % ≥ $ 76,482 ≥ 4.5 % ≥ $ 110,474 ≥ 6.5 % As of December 31, 2014 Total Capital (to risk-weighted assets) $ 206,465 13.70 % ≥ $ 120,553 ≥ 8.0 % ≥ $ 150,692 ≥ 10.0 % Tier 1 Capital (to risk-weighted assets) $ 190,354 12.63 % ≥ $ 60,277 ≥ 4.0 % ≥ $ 90,415 ≥ 6.0 % Tier 1 Capital (to average assets) $ 190,354 10.42 % ≥ $ 73,064 ≥ 4.0 % ≥ $ 91,330 ≥ 5.0 %

Financial Instruments with Off-

Financial Instruments with Off-Balance Sheet Risk	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Financial Instruments with Off-Balance Sheet Risk	Financial Instruments with Off-Balance Sheet Risk We make commitments to extend credit in the normal course of business to meet the financing needs of our customers. These financial instruments include commitments to extend credit in the form of loans or through standby letters of credit. Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since some of the commitments are expected to expire without being fully drawn upon, the total commitment amount does not necessarily represent future cash requirements. We are exposed to credit loss equal to the contract amount of the commitment in the event of nonperformance by the borrower. We use the same credit policies in making commitments as we do for on-balance-sheet instruments and we evaluate each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by us, is based on Management's credit evaluation of the borrower. Collateral held varies, but may include accounts receivable, inventory, property, plant and equipment, and real property. The contractual amount of loan commitments and standby letters of credit not reflected on the consolidated statements of condition was $376.6 million and $349.3 million at December 31, 2015 and 2014 , respectively. This amount included $191.3 million and $173.3 million under commercial lines of credit (these commitments are contingent upon customers maintaining specific credit standards), $130.4 million and $115.6 million under revolving home equity lines, $39.4 million and $46.7 million under undisbursed construction loans, $11.1 million and $11.6 million under personal and other lines of credit, and a remaining $4.4 million and $2.1 million under standby letters of credit at December 31, 2015 and 2014 , respectively. We record an allowance for losses on these off-balance sheet commitments based on an estimate of probabilities of these commitments being drawn upon according to our historical utilization experience on different types of commitments and expected loss severity. In 2015 we refined our methodology used in the calculation of the loss reserve on off-balance sheet commitments to more appropriately reflect the inherent credit risks, which totaled $749 thousand and $1.0 million as of December 31, 2015 and 2014 , respectively. Approximately 42% of the commitments expire in 2016, approximately 41% expire between 2017 and 2023 and approximately 17% expire thereafter.

Condensed Bank of Marin Bancorp

Condensed Bank of Marin Bancorp Parent Only Financial Statements	12 Months Ended
	Dec. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Bank of Marin Bancorp Parent Only Financial Statements	Condensed Bank of Marin Bancorp Parent Only Financial Statements Presented below is financial information for Bank of Marin Bancorp, parent holding company only. CONDENSED UNCONSOLIDATED STATEMENTS OF CONDITION December 31, 2015 and 2014 (in thousands) 2015 2014 Assets Cash and due from Bank of Marin $ 3,796 $ 3,228 Investment in bank subsidiary 215,722 201,609 Other assets 770 454 Total assets $ 220,288 $ 205,291 Liabilities and Stockholders' Equity Subordinated debentures $ 5,395 $ 5,185 Accrued expenses payable 109 80 Other liabilities 311 — Total liabilities 5,815 5,265 Stockholders' equity 214,473 200,026 Total liabilities and stockholders' equity $ 220,288 $ 205,291 CONDENSED UNCONSOLIDATED STATEMENTS OF INCOME Years ended December 31, 2015, 2014 and 2013 (in thousands) 2015 2014 2013 Income Dividends from bank subsidiary $ 6,500 $ — $ 28,000 Miscellaneous Income 6 8 — Total income 6,506 8 28,000 Expense Interest expense 420 421 34 Non-interest expense 973 851 1,313 Total expense 1,393 1,272 1,347 Income (loss) before income taxes and equity in undistributed net income of subsidiary 5,113 (1,264 ) 26,653 Income tax benefit 583 532 382 Income (loss) before equity in undistributed net income of subsidiary 5,696 (732 ) 27,035 Earnings of bank subsidiary greater (less) than dividends received from bank subsidiary 12,745 20,503 (12,765 ) Net income $ 18,441 $ 19,771 $ 14,270 CONDENSED UNCONSOLIDATED STATEMENTS OF CASH FLOWS Years ended December 31, 2015, 2014 and 2013 (in thousands) 2015 2014 2013 Cash Flows from Operating Activities: Net income $ 18,441 $ 19,771 $ 14,270 Adjustments to reconcile net income to net cash provided by(used in) operating activities: Earnings of bank subsidiary (greater) less than dividends received from bank subsidiary (12,745 ) (20,503 ) 12,765 Net change in operating assets and liabilities: Accretion of discount on subordinated debentures 210 216 19 Other assets (298 ) (88 ) 74 Intercompany receivable (18 ) — — Other liabilities 368 (99 ) 165 Net cash provided by (used in) operating activities 5,958 (703 ) 27,293 Cash Flows from Investing Activities: Capital contribution to subsidiary (1,156 ) (1,475 ) (2,258 ) Cash consideration paid for acquisition, net of cash acquired — — (15,952 ) Net cash used in investing activities (1,156 ) (1,475 ) (18,210 ) Cash Flows from Financing Activities: Stock options exercised and stock purchases 1,156 1,475 2,258 Dividends paid on common stock (5,390 ) (4,733 ) (3,970 ) Net cash used by financing activities (4,234 ) (3,258 ) (1,712 ) Net increase (decrease) in cash and cash equivalents 568 (5,436 ) 7,371 Cash and cash equivalents at beginning of period 3,228 8,664 1,293 Cash and cash equivalents at end of period $ 3,796 $ 3,228 $ 8,664 Supplemental schedule of non-cash investing and financing activities: Stock issued in payment of director fees $ 275 $ 236 $ 222 Acquisition: Fair value of assets acquired $ — $ — $ 39,503 Fair value of liabilities assumed $ — $ — $ 4,970 Stock issued to NorCal Community Bancorp shareholders $ — $ — $ 18,514 End of 2015 Audited Consolidated Financial Statements

Summary of Significant Accoun25

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation : The consolidated financial statements include the accounts of Bank of Marin Bancorp (“Bancorp”), a bank holding company, and its wholly-owned bank subsidiary, Bank of Marin (the “Bank”), a California state-chartered commercial bank. References to “we,” “our,” “us” mean the holding company and the Bank that are consolidated for financial reporting purposes. All material intercompany transactions have been eliminated. We have evaluated subsequent events through the date of filing with the Securities and Exchange Commission (“SEC”) and have determined that there are no subsequent events that require additional recognition or disclosure. On November 29, 2013, we completed the merger of NorCal Community Bancorp ("NorCal"), parent company of Bank of Alameda, to enhance our market presence (the “NorCal Acquisition”). On the date of acquisition, Bancorp assumed ownership of NorCal Community Bancorp Trusts I and II, respectively (the "Trusts"), which were formed for the sole purpose of issuing trust preferred securities. Bancorp is not considered the primary beneficiary of the Trusts (variable interest entities), therefore the Trusts are not consolidated in our consolidated financial statements, but rather the subordinated debentures are shown as a liability on our consolidated statements of condition. Bancorp's investment in the common stock of the Trusts is accounted for under the equity method and is included in interest receivable and other assets on the consolidated statements of condition.
Cash and Cash Equivalents	Cash and Cash Equivalents include cash, due from banks, federal funds sold and other short-term investments with maturity less than three months at the time of origination.
Investment Securities	Investment Securities are classified as "held-to-maturity," "trading securities" or "available-for-sale." Investments classified as held-to-maturity are those that we have the ability and intent to hold until maturity and are reported at cost, adjusted for the amortization or accretion of premiums or discounts. Investments held for resale in anticipation of short-term market movements are classified as trading securities and are reported at fair value, with unrealized gains and losses included in earnings. Investments that are neither held-to-maturity nor trading are classified as available-for-sale and are reported at fair value. Unrealized gains and losses for available-for-sale securities, net of related tax, are reported as a separate component of comprehensive income and included in stockholders' equity until realized. For discussion of our methodology in determining fair value, see Note 10. At each financial statement date, we assess whether declines in the fair value of held-to-maturity and available-for-sale securities below their costs are deemed to be other-than-temporary. We consider, among other things, (i) the length of time and the extent to which the fair value has been less than cost, (ii) the financial condition and near-term prospects of the issuer, and (iii) our intent and ability to retain the investment for a period of time sufficient to allow for any anticipated recovery in fair value. Evidence evaluated includes, but is not limited to, the remaining payment terms of the instrument and economic factors that are relevant to the collectability of the instrument, such as: current prepayment speeds, the current financial condition of the issuer(s), industry analyst reports, credit ratings, credit default rates, interest rate trends, the quality of any credit enhancement and the value of any underlying collateral. For each security in an unrealized loss position ("impaired security"), we assess whether we intend to sell the security or if it is more likely than not that we will be required to sell the security before recovery of its amortized cost basis. If we intend to sell the security or it is more likely than not we will be required to sell the security before recovery of its amortized cost basis, the entire difference between the investment’s amortized cost basis and its fair value at the balance sheet date is recognized against earnings. For impaired securities that are not intended for sale and will not be required to be sold prior to recovery of our amortized cost basis, we determine if the impairment has a credit loss component. For both held-to-maturity and available-for-sale securities, if the amount of cash flows expected to be collected are less than the amortized cost, an other-than-temporary impairment shall be considered to have occurred and the credit loss component is recognized against earnings as the difference between present value of the expected future cash flows and the amortized cost. In determining the present value of the expected cash flows, we discount the expected cash flows at the effective interest rate implicit in the security at the date of purchase. The remaining difference between the fair value and the amortized basis is deemed to be due to factors that are not credit related and is recognized in other comprehensive income, net of applicable taxes. For held-to-maturity securities, if there is no credit loss component, no impairment is recognized. The portion of other-than-temporary impairment recognized in other comprehensive income for credit impaired debt securities classified as held-to-maturity is accreted from other comprehensive income to the amortized cost of the debt security over the remaining life of the debt security in a prospective manner on the basis of the amount and timing of future estimated cash flows. Premiums and discounts are amortized or accreted over the life of the related security as an adjustment to yield using the effective interest method. Dividend and interest income are recognized when earned. Realized gains and losses on the sale of securities and credit losses related to other-than-temporary impairment on available-for-sale and held-to-maturity securities are included in non-interest income as gains (losses) on investment securities, net. The specific identification method is used to calculate realized gains and losses on sales of securities.
Originated Loans	Originated Loans are reported at the principal amount outstanding net of deferred fees (costs), charge-offs and the allowance for loan losses (“ALLL”). Interest income is accrued daily using the simple interest method. Loans are placed on non-accrual status when Management believes that there is doubt as to the collection of principal or interest, generally when they become contractually past due by ninety days or more with respect to principal or interest, except for loans that are well-secured and in the process of collection. When loans are placed on non-accrual status, any accrued but uncollected interest is reversed from current-period interest income. Non-accrual loans may be returned to accrual status when one of the following occurs: • The loan is brought current or after all principal and past due interest has been collected, and we are satisfied with the borrower's financial position and we are reasonably assured as to repayment. • The loan has become well secured and is in the process of collection. • We are satisfied with the borrower’s financial position, the obligor has resumed paying the full amount of the contractual interest and principal, the amounts contractually due are reasonably assured of repayment within a reasonable period, and there has been a sustained period of repayment performance (generally, six consecutive monthly payments), according to the modified terms for loans whose contractual terms have been restructured in a manner which grants a concession to a borrower experiencing financial difficulties (“troubled debt restructuring”). Loan origination fees and commitment fees, offset by certain direct loan origination costs, are deferred and amortized as yield adjustments over the contractual lives of the related loans.
Loan Charge-Off Policy	Loan Charge-Off Policy: For all loan types excluding overdraft accounts, we generally make a charge-off determination at or before 90 days past due. A collateral-dependent loan is partially charged down to the fair value of collateral securing it if: (1) it is deemed uncollectable, or (2) it has been classified as a loss by either our internal loan review process or external examiners. A non-collateral-dependent loan is partially charged down to its net realizable value under the same circumstances. For overdraft accounts, we generally charge them off when they exceed 60 days past due.
Acquired Loans	Acquired Loans : From time to time, we acquire loans through business acquisitions. Acquired loans are recorded at their estimated fair values at acquisition date in accordance with ASC 805 Business Combinations , factoring in credit losses expected to be incurred over the life of the loan. Accordingly, an allowance for loan losses is not carried over or recorded for acquired loans as of the acquisition date. The process of calculating fair values of the acquired loans, including estimates of losses that are expected to be incurred over the estimated remaining lives of the loans at acquisition date and the ongoing updates to Management's expectation of future cash flows, requires significant subjective judgments and assumptions, particularly considering the economic environment. The economic environment and the lack of market liquidity and transparency are factors that have influenced, and may continue to affect, these assumptions and estimates. We estimated the fair value of acquired loans at the acquisition date based on a discounted cash flow methodology that considered factors including the type of loan and related collateral, risk classification, fixed or variable interest rate, term of loan, whether or not the loan was amortizing, and current discount rates. Loans, except for purchased credit impaired ("PCI") loans, were grouped together according to similar risk characteristics and treated in the aggregate when applying various valuation techniques. Expected cash flows incorporated our best estimate of key assumptions at the time, such as property values, default rates, loss severity and prepayment speeds. Discount rates were based on market rates for new originations of comparable loans, where available, and included adjustments for liquidity factors. To the extent comparable market rates were not readily available, a discount rate was derived based on the assumptions of market participants' cost of funds, servicing costs and return requirements for comparable risk assets. In either case, the discount rate did not include a factor for credit losses, as that had been considered in estimating the cash flows. The initial estimate of cash flows to be collected was derived from assumptions such as default rates, loss severities and prepayment speeds. We acquired some loans from business combinations with evidence of significant credit quality deterioration subsequent to their origination and for which it was probable, at acquisition, that we would be unable to collect all contractually required payments. Management applied significant subjective judgment in determining which loans were PCI loans. Evidence of credit quality deterioration as of the purchase date may include data such as past due and nonaccrual status, risk grades and charge-off history. Revolving credit agreements (e.g., home equity lines of credit and revolving commercial loans) where the borrower had revolving rights at acquisition date were not considered PCI loans because the timing and amount of cash flows cannot be reasonably estimated. According to the accounting guidance for PCI loans, the nonaccretable difference on the date of acquisition is defined as the difference between the contractually required payments and the cash flows expected to be collected, considering the result of prepayments, and is not recorded. The difference between the undiscounted expected cash flows and the fair value at acquisition date ("accretable difference") is accreted into interest income at a level yield of return over the remaining term of the loan, provided that the timing and amount of future cash flows is reasonably estimable. For purposes of accounting for the PCI loans from past business combinations, we elected not to apply the pooling method but to account for these loans individually. Disposals of loans, which may include sales of loans to third parties, receipt of payments in full by the borrower, or foreclosure of the collateral, result in removal of the loan from the PCI loan portfolio at its carrying amount. If a PCI loan pays off earlier than expected, a gain is recorded as interest income when the payoff amount exceeds the recorded investment. For acquired loans not considered credit impaired ("non-PCI"), we recognize the entire fair value discount accretion to interest income, based on contractual cash flows using an effective interest rate method for term loans, and on a straight line basis for revolving lines. When a non-PCI loan is placed on non-accrual status subsequent to acquisition, accretion stops until the loan is returned to accrual status. The level of accretion on non-PCI loans varies from period to period due to maturities and early pay-offs of these loans during the reporting periods. Subsequent to acquisition, if the probable and estimable losses for non-PCI loans exceed the amount of the remaining unaccreted discount, the excess is established as an allowance for loan losses. All acquired loans were acquired in acquisitions and do not represent loans purchased from third parties. For further information regarding our acquired loans, see Note 4.
Allowance for Loan Losses	Allowance for Loan Losses is based upon estimates of loan losses and is maintained at a level considered adequate to provide for probable losses inherent in the loan portfolio. The allowance is increased by provisions for loan losses charged against earnings and reduced by charge-offs, net of recoveries. In periodic evaluations of the adequacy of the allowance balance, Management considers current economic conditions, known and inherent risks in the portfolio, adverse situations that may affect the borrower's ability to repay, the estimated value of any underlying collateral, our past loan loss experience and other factors. The ALLL is based on estimates, and ultimate losses may vary from current estimates. Our Board of Directors' Asset/Liability Management Committee (“ALCO”) reviews the adequacy of the ALLL at least quarterly. The overall allowance consists of 1) specific allowances for individually identified impaired loans ("ASC 310-10") and 2) general allowances for pools of loans ("ASC 450-20"), which incorporate changing qualitative and environmental factors (e.g., portfolio growth and trends, credit concentrations, economic and regulatory factors, etc.). The first component, specific allowances, results from the analysis of identified problem credits and the evaluation of sources of repayment including collateral, as applicable. Through Management's ongoing loan grading and credit monitoring process, individual loans are identified that have conditions indicating the borrower may be unable to pay all amounts due in accordance with the contractual terms. These loans are evaluated for impairment individually by Management. Management considers an originated loan to be impaired when it is probable we will be unable to collect all amounts due according to the contractual terms of the loan agreement. When the fair value of the impaired loan is less than the recorded investment in the loan, the difference is recorded as impairment through the establishment of a specific allowance. For loans determined to be impaired, the extent of the impairment is measured based on the present value of expected future cash flows discounted at the loan's effective interest rate at origination (for originated loans), based on the loan's observable market price, or based on the fair value of the collateral if the loan is collateral dependent or if foreclosure is imminent. Generally with problem credits that are collateral dependent, we obtain appraisals of the collateral at least annually. We may obtain appraisals more frequently if we believe the collateral value is subject to market volatility, if a specific event has occurred to the collateral, or if we believe foreclosure is imminent. The estimate of cash flows expected to be collected on PCI loans is updated each quarter and requires the continued use of key assumptions and estimates. We apply judgment to develop our estimate of cash flows given the current economic environment, changes in collateral values, loan workout plans, changing probability of default, loss severities and prepayments. If we have probable decreases in cash flows expected to be collected on PCI loans, specific allowances are established to account for credit deterioration subsequent to acquisition. The second component is an estimate of the probable inherent losses in each loan pool with similar risk characteristics. This analysis encompasses the entire loan portfolio excluding individually identified impaired loans and acquired loans whose purchase discount has not been fully accreted. Under our allowance model, loans are evaluated on a pool basis by loan segment which is further delineated by Federal regulatory reporting codes ("CALL codes"): • Loans secured by real estate: - 1-4 family residential construction loans - Other construction loans and all land development and other land loans - Secured by farmland (including residential and other improvements) - Revolving, open-end loans secured by 1-4 family residential properties and extended under lines of credit - Closed-end loans secured by 1-4 family residential properties, secured by first liens - Closed-end loans secured by 1-4 family residential properties, secured by junior liens - Secured by multifamily (5 or more) residential properties - Loans secured by owner-occupied non-farm nonresidential properties - Loans secured by other non-farm nonresidential properties • Loans to finance agricultural production and other loans to farmers • Commercial and industrial loans • Loans to individuals for household, family and other personal expenditures (i.e., consumer loans) • Other loans The model determines loan loss reserves by loan segment based on objective and subjective expected loss factors. Objective factors include an historical loss rate using a rolling twenty-quarter look-back, changes in the volume and nature of the loan portfolio, changes in credit quality metrics (past due loans, non-accrual loans, net charge-offs and adversely-graded loans), and the existence of credit concentrations. When a loan segment exceeds 100% of Tier 1 capital, additional reserves are provided due to credit concentration risk. Subjective factors include changes in the overall economic environment, legal and regulatory conditions, experience level of lending management and other relevant staff, uncertainties related to acquisitions, as well as the quality of our loan review process. The total amount allocated is determined by applying loss factors to outstanding loans by CALL code. For further information regarding the allowance for loan losses, see Note 4.
Allowance for Losses on Off-Balance-Sheet Commitments	Allowance for Losses on Off-Balance Sheet Commitments : We make commitments to extend credit to meet the financing needs of our customers in the form of loans or standby letters of credit. We are exposed to credit loss in the event that a decline in credit quality of the borrower leads to nonperformance. We record an allowance for losses on these off-balance sheet commitments based on an estimate of probabilities of these commitments being drawn upon according to our historical utilization experience on different types of commitments and expected loss severity. This allowance is included in interest payable and other liabilities on the consolidated statements of condition.
Transfers of Financial Assets	Transfers of Financial Assets : We have entered into certain participation agreements with other organizations. We account for these transfers of financial assets as sales when control over the transferred financial assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets and liabilities have been isolated from us, (2) the transferee has the right to pledge or exchange the assets (or beneficial interests) it received, free of conditions that constrain it from taking advantage of that right, beyond a trivial benefit and (3) we do not maintain effective control over the transferred financial assets or third-party beneficial interests related to those transferred assets.
Premises and Equipment	Premises and Equipment : Premises and equipment consist of leasehold improvements, furniture, fixtures, software and equipment and are stated at cost, less accumulated depreciation and amortization, which are calculated on a straight-line basis. Furniture and fixtures are depreciated over eight years and equipment is generally depreciated over three to twenty years. Leasehold improvements are amortized over the lesser of their estimated useful lives or the terms of the leases. When assets are sold or otherwise disposed of, the cost and related accumulated depreciation or amortization are removed from the accounts and any resulting gain or loss is recognized in income for the period. The cost of maintenance and repairs is charged to expense as incurred.
Business Combinations	Business Combinations : Business combinations are accounted for under the acquisition method of accounting in accordance with ASC 805, Business Combinations . Under the acquisition method the acquiring entity in a business combination recognizes the acquired assets and assumed liabilities at their estimated fair values as of the date of acquisition. Any excess of the purchase price over the fair value of net assets and other identifiable intangible assets acquired is recorded as goodwill. To the extent the fair value of net assets acquired, including other identifiable assets, exceed the purchase price, a bargain purchase gain is recognized. Assets acquired and liabilities assumed from contingencies must also be recognized at fair value, if the fair value can be determined during the measurement period. Results of operations of an acquired business are included in the statement of operations from the date of acquisition. Acquisition-related costs, including conversion and restructuring charges, are expensed as incurred.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets : Goodwill is determined as the excess of the fair value of the consideration transferred, plus the fair value of any noncontrolling interests in the acquiree, over the fair value of the net assets acquired and liabilities assumed as of the acquisition date. Goodwill that arises from a business combination determined to have an indefinite useful life is not amortized, but is periodically evaluated for impairment at the reporting unit level, at least annually. Intangible assets with definite useful lives are amortized over their estimated useful lives to their estimated residual values. Core deposit intangible represents estimated future benefit of deposits related to an acquisition and is booked separately from the related deposits and is evaluated periodically for impairment. The core deposit intangible asset is amortized on an accelerated method over its estimated useful life of ten years. We make a qualitative assessment of whether it is more likely than not that the fair value of a reporting unit where goodwill is assigned is less than its carrying amount before applying a two-step goodwill impairment test. If we conclude that it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, we do not perform the two-step impairment test. Goodwill is tested for impairment on an interim basis if circumstances change or an event occurs between annual tests that would more likely than not reduce the fair value of the reporting unit below its carrying amount. The qualitative assessment includes adverse events or circumstances identified that could negatively affect the reporting units’ fair value as well as positive and mitigating events. Such indicators may include, among others, a significant change in legal factors or in the general business climate, significant change in our stock price and market capitalization, unanticipated competition, and an action or assessment by a regulator.
Other Real Estate Owned (OREO)	Other Real Estate Owned ("OREO") : OREO is comprised of property acquired through foreclosure, in substance repossession or acceptance of deeds-in-lieu of foreclosure when the related loan receivable is de-recognized. OREO is recorded at fair value of the collateral less estimated costs to sell, establishing a new cost basis, and subsequently accounted for at the lower of cost or fair value less estimated costs to sell. Any shortfall of collateral value from the recorded investment of the related loan is recognized as loss at the time of foreclosure and is charged against the allowance for loan losses. Fair value of collateral is generally based on an independent appraisal of the property. Revenues and expenses associated with OREO, and subsequent adjustments to the fair value of the property and to the estimated costs of disposal, are realized and reported as a component of non-interest income and expense when incurred.
Bank Owned Life Insurance	Bank Owned Life Insurance : The Bank has purchased life insurance policies on certain key current and former officers. Bank owned life insurance ("BOLI") is recorded in interest receivable and other assets on the consolidated statements of condition at the amount that can be realized under the insurance contract at the period end, which is the cash surrender value adjusted for other charges or amounts due that are probable at settlement.
Federal Home Loan Bank of San Francisco (FHLB) Stock	Federal Home Loan Bank of San Francisco ("FHLB") Stock : The Bank is a member of the FHLB. Members are required to own a certain amount of stock based on the level of borrowings and other factors. Our investment in FHLB stock is carried at cost and is included as part of interest receivable and other assets on the consolidated statements of condition. We periodically evaluate FHLB stock for impairment based on ultimate recovery of par value. Both cash and stock dividends are reported as non-interest income.
Investments in Low Income Housing Tax Credit Funds	Investments in Low Income Housing Tax Credit Funds : We have invested in limited partnerships that were formed to develop and operate affordable housing projects for low or moderate income tenants throughout California. Our ownership in each limited partnership is less than two percent. In accordance with ASU No. 2014-01, Investments - Equity Method and Joint Ventures (Topic 323), we elected to account for the investments in qualified affordable housing tax credit funds using the proportional amortization method. Under the proportional amortization method, the initial cost of the investment is amortized in proportion to the tax credits and other tax benefits received and the net investment performance is recognized as part of income tax expense (benefit). Each of the partnerships must meet the regulatory minimum requirements for affordable housing for a minimum 15-year compliance period to fully utilize the tax credits. If the partnerships cease to qualify during the compliance period, the credit may be denied for any period in which the project is not in compliance and a portion of the credit previously taken is subject to recapture with interest.
Employee Stock Ownership Plan (ESOP)	Employee Stock Ownership Plan (“ESOP”) : We recognize compensation cost of the ESOP contribution when funds become committed for the purchase of Bancorp's common shares into the ESOP in the year in which the employees render service entitling them to the contribution. If we contribute stock, the compensation cost is the fair value of the shares when they are committed to be released, i.e. when the number of shares becomes known. During 2015 , 2014 and 2013 , the Bank only made cash contributions to the ESOP without leveraging.
Income Taxes	Income Taxes : Income taxes reported in the consolidated financial statements are computed based on an asset and liability approach. We recognize the amount of taxes payable or refundable for the current year and we record deferred tax assets and liabilities for future tax consequences attributable to differences between the financial statement carrying amount of existing assets and liabilities and their respective tax bases using enacted tax rates in effect for the year in which the temporary differences are expected to reverse. We record net deferred tax assets to the extent it is more likely than not that they will be realized. In evaluating our ability to recover the deferred tax assets and the need to establish a valuation allowance against the deferred tax assets, Management considers all available positive and negative evidence, including scheduled reversals of deferred tax liabilities, projected future taxable income, and tax planning strategies. In projecting future taxable income, Management develops assumptions including the amount of future state and federal pretax operating income, the reversal of temporary differences, and the implementation of feasible and prudent tax planning strategies. These assumptions require significant judgment about the forecasts of future taxable income and are consistent with the plans and estimates being used to manage the underlying business. Bancorp files consolidated federal and combined state income tax returns. We recognize the financial statement effect of a tax position when it is more likely than not, based on the technical merits and all available evidence, that the position will be sustained upon examination, including the resolution through protests, appeals or litigation processes. For tax positions that meet the more-likely-than-not threshold, we measure and record the largest amount of tax benefit that is greater than fifty percent likely of being realized upon ultimate settlement with the taxing authority. The remainder of the benefits associated with tax positions taken is recorded as unrecognized tax benefits, along with any related interest and penalties. Interest and penalties related to unrecognized tax benefits are recorded in tax expense. In deciding whether or not our tax positions taken meet the more-likely-than-not recognition threshold, we must make judgments and interpretations about the application of inherently complex state and federal tax laws. To the extent tax authorities disagree with tax positions taken by us, our effective tax rates could be materially affected in the period of settlement with the taxing authorities. Revision of our estimate of accrued income taxes also may result from our own income tax planning, which may affect effective tax rates and results of operations for any reporting period. We present an unrecognized tax benefit as a reduction of a deferred tax asset for a net operating loss ("NOL") carryforward, or similar tax loss or tax credit carryforward, rather than as a liability, when (1) the uncertain tax position would reduce the NOL or other carryforward under the tax law of the applicable jurisdiction and (2) we intend to and are able to use the deferred tax asset for that purpose. Otherwise, the unrecognized tax benefit is presented as a liability instead of being netted with deferred tax assets.
Earnings per share (EPS)	Earnings per share (“EPS”) are based upon the weighted average number of common shares outstanding during each year. The following table shows: 1) weighted average basic shares, 2) potentially dilutive weighted average common shares related to stock options, unvested restricted stock awards and stock warrant, and 3) weighted average diluted shares. Basic EPS are calculated by dividing net income by the weighted average number of common shares outstanding during each period, excluding unvested restricted stock awards. Diluted EPS are calculated using the weighted average number of potentially dilutive common shares. The number of potentially dilutive common shares included in quarterly diluted EPS is computed using the average market prices during the three months included in the reporting period under the treasury stock method. The number of potentially dilutive common shares included in year-to-date diluted EPS is a year-to-date weighted average of potentially dilutive common shares included in each quarterly diluted EPS computation. We have two forms of our outstanding common stock: common stock and unvested restricted stock awards. Holders of unvested restricted stock awards receive non-forfeitable dividends at the same rate as common shareholders and they both share equally in undistributed earnings. Therefore, under the two-class method, the difference in EPS is not significant for these participating securities.
Share-Based Compensation	Share-Based Compensation : All share-based payments granted subsequent to January 1, 2006, including stock options and restricted stock, are recognized as stock-based compensation expense in the statements of comprehensive income based on the grant-date fair value of the award with a corresponding increase in common stock. The grant-date fair value of the award is amortized on a straight-line basis over the requisite service period, which is generally the vesting period. The stock-based compensation expense excludes stock grants to directors as compensation for their services, which are recognized as director expenses separately based on the grant-date value of the stock. See Note 9 for further discussion. We determine fair value of stock options at grant date using the Black-Scholes pricing model that takes into account the stock price at the grant date, the exercise price, the expected life of the option, the volatility of the underlying stock, the expected dividend yield and the risk-free interest rate over the expected life of the option. The Black-Scholes option valuation model requires the input of highly subjective assumptions, including the expected life of the stock-based award and stock price volatility. The assumptions used represent Management's best estimates based on historical information, but these estimates involve inherent uncertainties and the application of Management's judgment. As a result, if other assumptions had been used, the recorded stock-based compensation expense could have been materially different from that recorded in the consolidated financial statements. In addition, we are required to estimate the expected forfeiture rates. If our actual forfeiture rate is materially different from the estimate, the share-based compensation expense could be materially different. Fair value of restricted stock is based on the stock price on grant date.
Derivative Financial Instruments and Hedging Activities	Derivative Financial Instruments and Hedging Activities Fair Value Hedges : All of our interest rate swap contracts are designated and qualified as fair value hedges. We apply shortcut hedge accounting for one of our interest rate swap contracts, as it is structured to mirror all of the provisions of the hedged loan agreement. This interest rate swap is carried on the consolidated statements of condition at its fair value in other assets (when the fair value is positive) or in other liabilities (when the fair value is negative). The change in the fair value of the interest rate swap is recorded in non-interest income. As a result of interest rate fluctuations, the hedged fixed-rate loan also gains or loses value. The unrealized gain or loss resulting from the change in fair value of the hedged-loan is recorded as an adjustment to the hedged loan and offset in non-interest income. Under shortcut hedge accounting treatment, the change in fair value of the interest rate swap is deemed perfectly offset by the change in fair value of the hedged loan, resulting in zero impact to net income. The six remaining interest rate swap contracts are accounted for using non-shortcut hedge accounting treatment. The interest rate swaps are closely aligned to the terms of the designated fixed-rate loans. The hedging relationships are tested for effectiveness on a quarterly basis. The interest rate swaps are carried on the consolidated statements of condition at their fair value in other assets (when the fair value is positive) or in other liabilities (when the fair value is negative). The changes in the fair value of the interest rate swaps are recorded in interest income. The unrealized gains or losses due to changes in fair value of the hedged fixed-rate loans are recorded as an adjustment to the hedged loans and offset in interest income. For derivative instruments executed with the same counterparty under a master netting arrangement, we do not offset fair value amounts of interest rate swaps in liability position with the ones in asset position.
Advertising Costs	Advertising Costs are expensed as incurred.
Comprehensive Income	Comprehensive Income includes net income and changes in the unrealized gain or loss of available-for-sale investment securities, net of related taxes, reported on the statements of comprehensive income and as components of stockholders' equity.
Fair Value Measurements	Fair Value Measurements : We use fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. We base our fair values on the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Securities available-for-sale and derivatives are recorded at fair value on a recurring basis. Additionally, from time to time, we may be required to record certain assets at fair value on a non-recurring basis, such as purchased loans recorded at acquisition date, certain impaired loans, other real estate owned and securities held-to-maturity that are other-than-temporarily impaired. These non-recurring fair value adjustments typically involve write-downs of individual assets due to application of lower-of-cost or market accounting. When we develop our fair value measurement process, we maximize the use of observable inputs. Whenever there is no readily available market data, we use our best estimates and assumptions in determining fair value, but these estimates involve inherent uncertainties and the application of Management's judgment. As a result, if other assumptions had been used, our recorded earnings or disclosures could have been materially different from those reflected in these financial statements. For detailed information on our use of fair value measurements and our related valuation methodologies, see Note 10.
Use of Estimates	Use of Estimates : The preparation of financial statements in conformity with generally accepted accounting principles in the United States of America requires Management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Significant accounting estimates reflected in the consolidated financial statements include ALLL, other-than-temporary impairment of investment securities, accrued liabilities, accounting for income taxes and fair value measurements (including fair values of acquired assets and assumed liabilities at acquisition dates) as discussed in the Notes herein.
Recently Adopted and Issued Accounting Standards	Recently Adopted and Issued Accounting Standards In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2014-09, Revenue from Contracts with Customers (Topic 606). The ASU is a converged standard involving FASB and International Financial Reporting Standards that provides a single comprehensive revenue recognition model for all contracts with customers across transactions and industries. The core principal of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount and at a time that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In August 2015, the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606) Deferral of the Effective Date which institutes a one-year deferral of the effective date of this amendment to annual reporting periods beginning after December 15, 2017. We are currently evaluating the provisions of this ASU and will be monitoring developments and additional guidance to determine the potential outcome the new standard will have on our financial condition and results of operations. In June 2014, the FASB issued ASU No. 2014-12, Compensation - Stock Compensation (Topic 718) Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period . This ASU provides guidance for entities that grant their employees share-based payment awards where a performance target that affects vesting could be achieved after the requisite service period. That is the case when an employee is eligible to retire or otherwise terminate employment before the end of the period in which a performance target could be achieved and still be eligible to vest in the award if and when the performance target is achieved. This ASU stipulates that compensation expense should be recognized in the period where the performance target becomes probable of being achieved as opposed to the date that the award was granted. ASU 2014-12 is effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. We do not expect this ASU to have a material impact on our financial condition or results of operations. In April 2015, the FASB issued ASU No. 2015-05, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40) Customer's Accounting for Fees Paid in a Cloud Computing Arrangement . The amendments in this ASU provide guidance about a customer's accounting for fees paid in a cloud computing arrangement. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, then the customer should account for the arrangement as a service contract. The two criteria that must be met to be considered a software license are: 1) the customer has the contractual right to take possession of the software at any time during the hosting period without significant penalty; and 2) it is feasible for the customer to either run the software on its own hardware or contract with another party unrelated to the vendor to host the software. ASU 2015-05 is effective for annual periods, including interim periods within those annual periods beginning after December 15, 2015. We do not expect this ASU to have a material impact on our financial condition or results of operations. In September 2015, the FASB issued ASU No. 2015-16, Business Combinations (Topic 805) Simplifying the Accounting for Measurement-Period Adjustments . The amendments in this ASU require that an acquirer recognize adjustments to estimated amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. Prior to the amendments, an acquirer was required to retrospectively adjust the provisional amounts recognized at the acquisition date with a corresponding adjustment to goodwill. ASU 2015-16 is effective for public business entities for fiscal years beginning after December 15, 2015, including interim periods within those fiscal years. We do not expect this ASU to have a material impact on our financial condition or results of operations. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities . The amendments in this ASU make improvements to GAAP related to financial instruments that include the following as applicable to us. • Equity investments, except for those accounted for under the equity method of accounting or those that result in consolidation of the investee, are required to be measured at fair value with changes in fair value recognized in net income. However, an entity may choose to measure equity investments that do not have readily determinable fair values at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. • Simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment - if impairment exists, this requires measuring the investment at fair value. • Eliminates the requirement for public companies to disclose the method(s) and significant assumptions used to estimate the fair value that is currently required to be disclosed for financial instruments measured at amortized cost on the balance sheet. • Public companies will be required to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes. • Requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements. • The reporting entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity's other deferred tax assets. ASU 2016-01 is effective for public business entities for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. This ASU will impact our financial statement disclosures, however, we do not expect this ASU to have a material impact on our financial condition or results of operations. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) . This ASU was issued to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities, including leases classified as operating leases under previous GAAP, on the balance sheet and requiring additional disclosures of key information about leasing arrangements. ASU 2016-02 is effective for annual periods, including interim periods within those annual periods beginning after December 15, 2018 and requires a modified retrospective approach to adoption. Early application of the amendments is permitted. We are currently evaluating the provisions of this ASU and will be monitoring developments and additional guidance to determine the potential outcome the amendments will have on our financial condition and results of operations.

Summary of Significant Accoun26

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Schedule of Earnings Per Share Reconciliation	The following table shows: 1) weighted average basic shares, 2) potentially dilutive weighted average common shares related to stock options, unvested restricted stock awards and stock warrant, and 3) weighted average diluted shares. Basic EPS are calculated by dividing net income by the weighted average number of common shares outstanding during each period, excluding unvested restricted stock awards. Diluted EPS are calculated using the weighted average number of potentially dilutive common shares. The number of potentially dilutive common shares included in quarterly diluted EPS is computed using the average market prices during the three months included in the reporting period under the treasury stock method. The number of potentially dilutive common shares included in year-to-date diluted EPS is a year-to-date weighted average of potentially dilutive common shares included in each quarterly diluted EPS computation. We have two forms of our outstanding common stock: common stock and unvested restricted stock awards. Holders of unvested restricted stock awards receive non-forfeitable dividends at the same rate as common shareholders and they both share equally in undistributed earnings. Therefore, under the two-class method, the difference in EPS is not significant for these participating securities. (in thousands, except per share data) 2015 2014 2013 Weighted average basic shares outstanding 5,966 5,893 5,457 Potentially dilutive common shares related to: Stock options 41 43 44 Unvested restricted stock awards 5 5 4 Warrant 53 65 53 Weighted average diluted shares outstanding 6,065 6,006 5,558 Net income $ 18,441 $ 19,771 $ 14,270 Basic EPS $ 3.09 $ 3.35 $ 2.62 Diluted EPS $ 3.04 $ 3.29 $ 2.57 Weighted average anti-dilutive shares not included in the calculation of diluted EPS 36 45 49

Acquisition (Tables)

Acquisition (Tables)	12 Months Ended
	Dec. 31, 2015
Business Combinations [Abstract]
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	At December 31, 2015 , the future estimated amortization expense is as follows: (in thousands) 2016 2017 2018 2019 2020 Thereafter Total Core deposit intangible amortization $ 533 $ 472 $ 413 $ 388 $ 365 $ 942 $ 3,113
Schedule of Pro Forma Revenue and Earnings	The following table presents NorCal Community Bancorp's revenue (interest income and non-interest income) and earnings included in our consolidated statement of comprehensive income for the year ended December 31, 2013. This pro forma information does not necessarily reflect the results of operations that would have resulted had the acquisition been completed on January 1, 2013, nor is it indicative of the results of operations in future periods. Pro Forma Revenue and Earnings (in thousands) Revenue Earnings Actual from November 29, 2013 to December 31, 2013 of NorCal only $ 1,239 $ 70 2013 supplemental pro forma of the combined entity from January 1, 2013 to December 31, 2013 1 $ 79,586 $ 14,514 1 2013 supplemental pro forma earnings include $3.7 million of one-time acquisition related expenses booked at Bank of Marin Bancorp and $1.9 million of one-time acquisition related expenses booked at NorCal Community Bancorp in 2013.
Schedule of Acquisition Related Costs	We incurred one-time third-party acquisition-related expenses in the consolidated statements of comprehensive income in 2014 and 2013 as follows: (in thousands) 2014 2013 Data processing $ 442 $ 2,807 * Professional services — 660 Personnel severance 304 203 Other — 74 Total $ 746 $ 3,744 *Primarily relates to NorCal's core processing system contract termination and deconversion fees.

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Schedule of Available-for-sale Securities and Held-to-maturity Securities Reconciliation	Our investment securities portfolio consists of obligations of state and political subdivisions, corporate bonds, U.S. government agency securities, including mortgage-backed securities (“MBS”) and collateralized mortgage obligations (“CMOs”) issued or guaranteed by Federal National Mortgage Association ("FNMA"), Federal Home Loan Mortgage Corporation ("FHLMC"), or Government National Mortgage Association ("GNMA"), debentures issued by government-sponsored agencies such as FNMA, Federal Farm Credit Bureau, FHLB and FHLMC, as well as privately issued CMOs, as reflected in the table below: December 31, 2015 December 31, 2014 Amortized Fair Gross Unrealized Amortized Fair Gross Unrealized (in thousands) Cost Value Gains (Losses) Cost Value Gains (Losses) Held-to-maturity: Obligations of state and political subdivisions $ 42,919 $ 44,146 $ 1,246 $ (19 ) $ 63,425 $ 65,121 $ 1,736 $ (40 ) Corporate bonds 15,072 15,098 42 (16 ) 40,257 40,448 216 (25 ) MBS pass-through securities issued by FHLMC and FNMA 11,646 11,810 171 (7 ) 12,755 13,074 319 — Total held-to-maturity 69,637 71,054 1,459 (42 ) 116,437 118,643 2,271 (65 ) Available-for-sale: Securities of U.S. government agencies: MBS pass-through securities issued by FHLMC and FNMA 138,222 138,462 694 (454 ) 92,963 94,214 1,262 (11 ) CMOs issued by FNMA 18,266 18,219 97 (144 ) 14,771 14,790 77 (58 ) CMOs issued by FHLMC 22,889 22,932 82 (39 ) 31,238 31,260 109 (87 ) CMOs issued by GNMA 10,326 10,480 169 (15 ) 17,573 17,855 298 (16 ) Debentures of government- sponsored agencies 161,690 160,892 28 (826 ) 14,694 14,557 95 (232 ) Privately issued CMOs 3,960 4,150 190 — 7,137 7,294 172 (15 ) Obligations of state and political subdivisions 57,110 57,673 580 (17 ) 15,733 15,880 155 (8 ) Corporate bonds 4,947 4,979 43 (11 ) 4,936 4,998 66 (4 ) Total available-for-sale 417,410 417,787 1,883 (1,506 ) 199,045 200,848 2,234 (431 ) Total investment securities $ 487,047 $ 488,841 $ 3,342 $ (1,548 ) $ 315,482 $ 319,491 $ 4,505 $ (496 )
Investments Classified by Contractual Maturity Date	The amortized cost and fair value of investment debt securities by contractual maturity at December 31, 2015 and 2014 are shown below. Expected maturities will differ from contractual maturities because the issuers of the securities may have the right to call or prepay obligations with or without call or prepayment penalties. December 31, 2015 December 31, 2014 Held-to-Maturity Available-for-Sale Held-to-Maturity Available-for-Sale (in thousands) Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Within one year $ 18,853 $ 18,920 $ 12,135 $ 12,176 $ 39,778 $ 39,913 $ 2,378 $ 2,388 After one but within five years 31,677 32,360 188,007 187,326 50,983 51,953 43,866 43,919 After five years through ten years 8,580 8,969 64,899 64,999 11,679 12,426 9,644 9,749 After ten years 10,527 10,805 152,369 153,286 13,997 14,351 143,157 144,792 Total $ 69,637 $ 71,054 $ 417,410 $ 417,787 $ 116,437 $ 118,643 $ 199,045 $ 200,848
Schedule of Unrealized Loss on Investments	Fifty-four and twenty-eight investment securities were in unrealized loss positions at December 31, 2015 and 2014 , respectively. Those securities are summarized and classified according to the duration of the loss period in the tables below: December 31, 2015 < 12 continuous months ≥ 12 continuous months Total securities in a loss position (in thousands) Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss Held-to-maturity: MBS pass-through securities issued by FHLMC and FNMA $ 2,332 $ (7 ) $ — $ — $ 2,332 $ (7 ) Obligations of state & political subdivisions $ 8,297 $ (19 ) $ — $ — $ 8,297 $ (19 ) Corporate bonds 3,523 (15 ) 1,999 (1 ) 5,522 (16 ) Total held-to-maturity 14,152 (41 ) 1,999 (1 ) 16,151 (42 ) Available-for-sale: MBS pass-through securities issued by FHLMC and FNMA 68,809 (454 ) — — 68,809 (454 ) CMOs issued by FNMA 9,277 (80 ) 3,158 (64 ) 12,435 (144 ) CMOs issued by FHLMC — — 1,989 (39 ) 1,989 (39 ) CMOs issued by GNMA 164 — 2,374 (15 ) 2,538 (15 ) Debentures of government- sponsored agencies 136,064 (713 ) 9,887 (113 ) 145,951 (826 ) Obligations of state & political subdivisions 4,557 (15 ) 579 (2 ) 5,136 (17 ) Corporate bonds 2,986 (11 ) — — 2,986 (11 ) Total available-for-sale 221,857 (1,273 ) 17,987 (233 ) 239,844 (1,506 ) Total temporarily impaired securities $ 236,009 $ (1,314 ) $ 19,986 $ (234 ) $ 255,995 $ (1,548 ) December 31, 2014 < 12 continuous months > 12 continuous months Total securities in a loss position (in thousands) Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss Held-to-maturity: Obligations of state & political subdivisions $ 5,830 $ (27 ) $ 359 $ (13 ) $ 6,189 $ (40 ) Corporate bonds 3,009 (1 ) 3,533 (24 ) 6,542 (25 ) Total held-to-maturity 8,839 (28 ) 3,892 (37 ) 12,731 (65 ) Available-for-sale: MBS pass-through securities issued by FHLMC and FNMA 1,960 (11 ) — — 1,960 (11 ) CMOs issued by FNMA — — 4,115 (58 ) 4,115 (58 ) CMOs issued by FHLMC 17,157 (44 ) 2,291 (43 ) 19,448 (87 ) CMOs issued by GNMA 3,262 (16 ) — — 3,262 (16 ) Debentures of government- sponsored agencies 494 (1 ) 9,769 (231 ) 10,263 (232 ) Privately issued CMOs 817 (15 ) — — 817 (15 ) Obligations of state & political subdivisions 2,695 (3 ) 1,112 (5 ) 3,807 (8 ) Corporate bonds 1,002 (1 ) 990 (3 ) 1,992 (4 ) Total available-for-sale 27,387 (91 ) 18,277 (340 ) 45,664 (431 ) Total temporarily impaired securities $ 36,226 $ (119 ) $ 22,169 $ (377 ) $ 58,395 $ (496 )
Gain (Loss) on Investments [Table Text Block]	Sales of investment securities and gross gains and losses are shown in the following table. The sales of the held-to-maturity securities were due to evidence of significant deterioration of the issuers' creditworthiness since purchase. (in thousands) 2015 2014 2013 Available-for-sale: Sales proceeds $ 2,099 $ 2,436 $ 7,973 Gross gains $ 7 $ 4 $ 86 Gross losses, including OTTI $ (1 ) $ (28 ) $ (104 ) Held-to-maturity: Sales proceeds $ 1,015 $ 2,146 $ 6,442 Gross gains $ 73 $ 104 $ 67 Gross losses $ — $ — $ (50 )

Loans and Allowance for Loan 29

Loans and Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2015
Receivables [Abstract]
Past Due Financing Receivables	Outstanding loans by class and payment aging as of December 31, 2015 and 2014 are as follows: Loan Aging Analysis by Class as of December 31, 2015 and 2014 (dollars in thousands) Commercial and industrial Commercial real estate, owner-occupied Commercial real estate, investor Construction Home equity Other residential 1 Installment and other consumer Total December 31, 2015 30-59 days past due $ 36 $ — $ 1,096 $ 1 $ — $ — $ 249 $ 1,382 60-89 days past due — — — — 633 — 89 722 90 days or more past due 21 — — — 99 — — 120 Total past due 57 — 1,096 1 732 — 338 2,224 Current 219,395 242,309 714,783 65,494 111,568 73,154 22,301 1,449,004 Total loans 3 $ 219,452 $ 242,309 $ 715,879 $ 65,495 $ 112,300 $ 73,154 $ 22,639 $ 1,451,228 Non-accrual loans 2 $ 21 $ — $ 1,903 $ 1 $ 171 $ — $ 83 $ 2,179 December 31, 2014 30-59 days past due $ 183 $ — $ — $ — $ 646 $ — $ 180 $ 1,009 Non-accrual loans 2 — 1,403 2,429 5,134 280 — 104 9,350 Total past due 183 1,403 2,429 5,134 926 — 284 10,359 Current 210,040 229,202 671,070 43,279 109,862 73,035 16,504 1,352,992 Total loans 3 $ 210,223 $ 230,605 $ 673,499 $ 48,413 $ 110,788 $ 73,035 $ 16,788 $ 1,363,351 1 Our residential loan portfolio includes no sub-prime loans, nor is it our normal practice to underwrite loans commonly referred to as "Alt-A mortgages," the characteristics of which are loans lacking full documentation, borrowers having low FICO scores or higher loan-to-value ratios. 2 Amounts include $1 thousand and $1.4 million of Purchased Credit Impaired ("PCI") loans that have stopped accreting interest at December 31, 2015 and 2014 , respectively. Amounts exclude accreting PCI loans of $3.7 million and $3.8 million at December 31, 2015 and 2014 , respectively, as we have a reasonable expectation about future cash flows to be collected and we continue to recognize accretable yield on these loans in interest income. There were no accruing loans past due more than ninety days at December 31, 2015 or 2014 . 3 Amounts included deferred loan origination costs, net of deferred loan origination fees, of $768 thousand and $487 thousand at December 31, 2015 and 2014 , respectively. Amounts were also net of unaccreted purchase discounts on non-PCI loans of $3.2 million and $4.4 million at December 31, 2015 and 2014 , respectively.
Financing Receivable Credit Quality Indicators	The following table represents an analysis of loans by internally assigned grades, including PCI loans, at December 31, 2015 and 2014 : (in thousands) Commercial and industrial Commercial real estate, owner-occupied Commercial real estate, investor Construction Home equity Other residential Installment and other consumer Purchased credit-impaired Total Credit Risk Profile by Internally Assigned Grade: December 31, 2015 Pass $ 192,560 $ 219,060 $ 710,042 $ 62,255 $ 109,959 $ 73,154 $ 22,307 $ 3,260 $ 1,392,597 Special Mention 22,457 12,371 372 — 1,100 — — — 36,300 Substandard 4,260 9,167 3,739 3,239 1,173 — 332 421 22,331 Total loans $ 219,277 $ 240,598 $ 714,153 $ 65,494 $ 112,232 $ 73,154 $ 22,639 $ 3,681 $ 1,451,228 December 31, 2014 Pass $ 197,659 $ 205,820 $ 651,548 $ 41,710 $ 107,933 $ 70,987 $ 16,101 $ 2,210 $ 1,293,968 Special Mention 6,776 10,406 13,304 1,008 322 — 190 1,140 33,146 Substandard 5,464 11,763 6,473 5,684 2,466 2,048 497 1,842 36,237 Total loans $ 209,899 $ 227,989 $ 671,325 $ 48,402 $ 110,721 $ 73,035 $ 16,788 $ 5,192 $ 1,363,351
Troubled Debt Restructurings on Financing Receivables	(dollars in thousands) Number of Contracts Modified Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment at period end Troubled Debt Restructurings during the year ended December 31, 2015: Commercial and industrial 7 $ 3,271 $ 3,251 $ 2,811 Total 7 $ 3,271 $ 3,251 $ 2,811 Troubled Debt Restructurings during the year ended December 31, 2014: Commercial and industrial 6 $ 1,039 $ 1,258 $ 1,251 Commercial real estate, owner occupied 1 4,226 4,216 4,175 Commercial real estate, investor 2 224 224 220 Construction 2 964 1,312 1,309 Installment and other consumer 6 281 278 268 Total 17 $ 6,734 $ 7,288 $ 7,223 Troubled Debt Restructurings during the year ended December 31, 2013: Commercial and industrial 8 $ 1,176 $ 1,377 $ 1,274 Construction 1 2,961 2,956 2,930 Home Equity 1 539 538 534 Other residential 3 7,135 7,156 5,368 Installment and other consumer 2 11 9 7 Total 15 $ 11,822 $ 12,036 $ 10,113 The table below summarizes outstanding TDR loans by loan class as of December 31, 2015 and December 31, 2014 . The summary includes both TDRs that are on non-accrual status and those that continue to accrue interest. (in thousands) As of Recorded investment in Troubled Debt Restructurings 1 December 31, 2015 December 31, 2014 Commercial and industrial $ 4,698 $ 3,584 Commercial real estate, owner-occupied 6,993 8,459 Commercial real estate, investor 514 524 Construction 2 3,238 5,684 Home equity 460 694 Other residential 2,010 2,045 Installment and other consumer 1,168 1,713 Total $ 19,081 $ 22,703 1 Includes $19.0 million and $15.9 million of TDR loans that were accruing interest as of December 31, 2015 and December 31, 2014 respectively. Includes $137 thousand and $1.8 million of acquired loans at December 31, 2015 and December 31, 2014 , respectively. 2 In June 2015, one TDR loan was transferred to loans held-for-sale at fair value totaling $1.5 million , net of an $839 thousand charge-off to the allowance for loan losses. The loan was subsequently sold in June 2015 for no gain or loss.
Impaired Financing Receivables	The table below summarizes information on impaired loans and their related allowances. Total impaired loans include non-accrual loans, accruing TDR loans and accreting PCI loans that have experienced post-acquisition declines in cash flows expected to be collected. (in thousands) Commercial and industrial Commercial real estate, owner-occupied Commercial real estate, investor Construction Home equity Other residential Installment and other consumer Total December 31, 2015 Recorded investment in impaired loans: With no specific allowance recorded $ 2,198 $ 4,111 $ 2,416 $ 2,687 $ 171 $ 1,214 $ 131 $ 12,928 With a specific allowance recorded 2,522 2,882 — 551 388 797 1,120 8,260 Total recorded investment in impaired loans $ 4,720 $ 6,993 $ 2,416 $ 3,238 $ 559 $ 2,011 $ 1,251 $ 21,188 Unpaid principal balance of impaired loans: With no specific allowance recorded $ 2,198 $ 4,111 $ 4,408 $ 2,687 $ 171 $ 1,214 $ 131 $ 14,920 With a specific allowance recorded 2,565 2,882 — 737 388 797 1,120 8,489 Total unpaid principal balance of impaired loans $ 4,763 $ 6,993 $ 4,408 $ 3,424 $ 559 $ 2,011 $ 1,251 $ 23,409 Specific allowance $ 912 $ 70 $ — $ 1 $ 3 $ 67 $ 116 $ 1,169 Average recorded investment in impaired loans during 2015 $ 4,237 $ 7,886 $ 2,833 $ 4,164 $ 602 $ 2,028 $ 1,523 $ 23,273 Interest income recognized on impaired loans during 2015 $ 238 $ 295 $ 33 $ 86 $ 18 $ 92 $ 64 $ 826 December 31, 2014 Recorded investment in impaired loans: With no specific allowance recorded $ 1,141 $ 5,577 $ 2,954 $ 5,134 $ 393 $ 1,026 $ 239 $ 16,464 With a specific allowance recorded 2,443 2,882 — 561 300 1,019 1,554 8,759 Total recorded investment in impaired loans $ 3,584 $ 8,459 $ 2,954 $ 5,695 $ 693 $ 2,045 $ 1,793 $ 25,223 Unpaid principal balance of impaired loans: With no specific allowance recorded $ 1,186 $ 6,577 $ 4,945 $ 7,824 $ 880 $ 1,026 $ 239 $ 22,677 With a specific allowance recorded 2,524 2,882 — 749 300 1,019 1,554 9,028 Total recorded investment in impaired loans $ 3,710 $ 9,459 $ 4,945 $ 8,573 $ 1,180 $ 2,045 $ 1,793 $ 31,705 Specific allowance $ 694 $ 65 $ — $ 3 $ — $ 92 $ 284 $ 1,138 Average recorded investment in impaired loans during 2014 $ 5,354 $ 6,604 $ 3,138 $ 6,471 $ 741 $ 1,744 $ 1,857 $ 25,909 Interest income recognized on impaired loans during 2014 $ 378 $ 288 $ 28 $ 85 $ 19 $ 74 $ 76 $ 948 Average recorded investment in impaired loans during 2013 $ 7,168 $ 3,519 $ 5,847 $ 7,200 $ 909 $ 2,632 $ 1,872 $ 29,147 Interest income recognized on impaired loans during 2013 $ 476 $ 253 $ 14 $ 249 $ 29 $ 89 $ 71 $ 1,181
Allowance for Credit Losses on Financing Receivables	The following tables disclose loans by major portfolio category and activity in the ALLL, as well as the related ALLL disaggregated by impairment evaluation method: Allowance for Loan Losses and Recorded Investment In Loans (dollars in thousands) Commercial and industrial Commercial real estate, owner-occupied Commercial real estate, investor Construction Home equity Other residential Installment and other consumer Unallocated Total As of December 31, 2015: Ending ALLL related to loans collectively evaluated for impairment $ 2,111 $ 2,179 $ 6,178 $ 723 $ 907 $ 327 $ 309 $ 1,096 $ 13,830 Ending ALLL related to loans individually evaluated for impairment 904 70 — — 3 67 116 — 1,160 Ending ALLL related to purchased credit-impaired loans 8 — — 1 — — — — 9 Ending balance $ 3,023 $ 2,249 $ 6,178 $ 724 $ 910 $ 394 $ 425 $ 1,096 $ 14,999 Loans outstanding: Collectively evaluated for impairment $ 214,695 $ 233,605 $ 711,737 $ 62,256 $ 111,673 $ 71,143 $ 21,388 $ — $ 1,426,497 Individually evaluated for impairment 1 4,582 6,993 2,416 3,238 559 2,011 1,251 — 21,050 Purchased credit-impaired 175 1,711 1,726 1 68 — — — 3,681 Total $ 219,452 $ 242,309 $ 715,879 $ 65,495 $ 112,300 $ 73,154 $ 22,639 $ — $ 1,451,228 Ratio of allowance for loan losses to total loans 1.38 % 0.93 % 0.86 % 1.11 % 0.81 % 0.54 % 1.88 % NM 1.03 % Allowance for loan losses to non-accrual loans 14,395 % NM 325 % 72,400 % 532 % NM 512 % NM 688 % 1 Total excludes $138 thousand of PCI loans that have experienced post-acquisition declines in cash flows expected to be collected. These loans are included in the "purchased credit-impaired" amount in the next line below. NM - Not Meaningful Allowance for Loan Losses and Recorded Investment In Loans (dollars in thousands) Commercial and industrial Commercial real estate, owner-occupied Commercial real estate, investor Construction Home equity Other residential Installment and other consumer Unallocated Total As of December 31, 2014: Ending ALLL related to loans collectively evaluated for impairment $ 2,143 $ 1,859 $ 6,672 $ 836 $ 859 $ 341 $ 282 $ 969 $ 13,961 Ending ALLL related to loans individually evaluated for impairment 690 65 — — — 92 284 — 1,131 Ending ALLL related to purchased credit-impaired loans 4 — — 3 — — — — 7 Ending balance $ 2,837 $ 1,924 $ 6,672 $ 839 $ 859 $ 433 $ 566 $ 969 $ 15,099 Loans outstanding: Collectively evaluated for impairment $ 206,603 $ 220,933 $ 668,371 $ 42,718 $ 110,028 $ 70,990 $ 14,995 $ — $ 1,334,638 Individually evaluated for impairment 1 3,296 7,056 2,954 5,684 693 2,045 1,793 — 23,521 Purchased credit-impaired 324 2,616 2,174 11 67 — — — 5,192 Total $ 210,223 $ 230,605 $ 673,499 $ 48,413 $ 110,788 $ 73,035 $ 16,788 $ — $ 1,363,351 Ratio of allowance for loan losses to total loans 1.35 % 0.83 % 0.99 % 1.73 % 0.78 % 0.59 % 3.37 % NM 1.11 % Allowance for loan losses to non-accrual loans NM 137 % 275 % 16 % 307 % NM 544 % NM 161 % 1 Total excludes $1.7 million PCI loans that have experienced credit deterioration post-acquisition, which are included in the "purchased credit-impaired" amount in the next line below. NM - Not Meaningful Allowance for Loan Losses Rollforward for the Period (in thousands) Commercial and industrial Commercial real estate, owner-occupied Commercial real estate, investor Construction Home equity Other residential Installment and other consumer Unallocated Total Year ended December 31, 2015: Allowance for loan losses: Beginning balance 2,837 1,924 6,672 839 859 433 566 969 15,099 Provision (reversal) (45 ) 325 (517 ) 724 48 (39 ) (123 ) 127 500 Charge-offs (5 ) — — (839 ) — — (20 ) — (864 ) Recoveries $ 236 $ — $ 23 $ — $ 3 $ — $ 2 $ — $ 264 Ending balance $ 3,023 $ 2,249 $ 6,178 $ 724 $ 910 $ 394 $ 425 $ 1,096 $ 14,999 Year ended December 31, 2014: Allowance for loan losses: Beginning balance $ 3,056 $ 2,012 $ 6,196 $ 633 $ 875 $ 317 $ 629 $ 506 $ 14,224 Provision (reversal) (321 ) (93 ) 431 314 (19 ) 116 (141 ) 463 750 Charge-offs (66 ) — — (204 ) — — (7 ) — (277 ) Recoveries 168 5 45 96 3 — 85 — 402 Ending balance $ 2,837 $ 1,924 $ 6,672 $ 839 $ 859 $ 433 $ 566 $ 969 $ 15,099 Year ended December 31, 2013: Allowance for loan losses: Beginning balance $ 4,100 $ 1,313 $ 4,372 $ 611 $ 1,264 $ 551 $ 1,231 $ 219 $ 13,661 Provision (reversal) (1,393 ) 615 1,940 83 (223 ) (234 ) (535 ) 287 540 Charge-offs (672 ) — (156 ) (62 ) (176 ) — (88 ) — (1,154 ) Recoveries 1,021 84 40 1 10 — 21 — 1,177 Ending balance $ 3,056 $ 2,012 $ 6,196 $ 633 $ 875 $ 317 $ 629 $ 506 $ 14,224
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Table Text Block]	The following table presents the fair value of purchased credit-impaired and other loans acquired from Bank of Alameda as of the acquisition date: November 29, 2013 (in thousands) Purchased credit-impaired loans Other purchased loans Total Contractually required payments including interest $ 5,706 $ 211,769 $ 217,475 Less: nonaccretable difference (1,183 ) — (1,183 ) Cash flows expected to be collected (undiscounted) 4,523 211,769 216,292 Accretable yield (707 ) (41,826 ) (42,533 ) Fair value of purchased loans $ 3,816 $ 169,943 $ 173,759 1 $6.6 million of the $41.8 million represents the difference between the contractual principal amounts due and the fair value. This discount is to be accreted to interest income over the remaining lives of the loans. The remaining $35.2 million is the contractual interest to be earned over the life of the loans. The following table reflects the outstanding balance and related carrying value of PCI loans as of the acquisition date: November 29, 2013 PCI Loans (in thousands) Unpaid principal balance Fair value Commercial and industrial $ 847 $ 369 Commercial real estate 3,757 3,362 Construction 150 16 Home equity 239 69 Total purchased credit-impaired loans $ 4,993 $ 3,816 The following table reflects the outstanding balance and related carrying value of PCI loans related to the 2013 NorCal acquisition and the 2011 Charter Oak acquisition as of December 31, 2015 and 2014 : December 31, 2015 December 31, 2014 PCI Loans (dollars in thousands) Unpaid principal balance Carrying value Unpaid principal balance Carrying value Commercial and industrial $ 237 $ 175 $ 479 $ 324 Commercial real estate 4,329 3,437 6,831 4,790 Construction 187 1 136 11 Home equity 224 68 232 67 Total purchased credit-impaired loans $ 4,977 $ 3,681 $ 7,678 $ 5,192
Accretable Yield Activity	The activities in the accretable yield, or income expected to be earned, for PCI loans were as follows: Accretable Yield Years ended (dollars in thousands) December 31, 2015 December 31, 2014 December 31, 2013 Balance at beginning of period $ 4,027 $ 3,649 $ 3,960 Additions — — 707 Removals 1 (914 ) (273 ) (793 ) Accretion (495 ) (613 ) (725 ) Reclassifications from nonaccretable difference 2 — 1,264 500 Balance at end of period $ 2,618 $ 4,027 $ 3,649 1 Represents the accretable difference that is relieved when a loan exits the PCI population due to payoff, full charge-off, or transfer to repossessed assets, etc. 2 Primarily relates to changes in expected credit performance and changes in expected timing of cash flows.
Schedule of Related Party Transactions	An analysis of net loans to related parties for each of the three years ended December 31, 2015 , 2014 and 2013 is as follows: (in thousands) 2015 2014 2013 Balance at beginning of year $ 3,329 $ 3,749 $ 3,425 Additions — — 550 Advances 165 — 569 Repayments (390 ) (420 ) — Reclassified as unrelated-party loan due to a change in borrower status (542 ) — (795 ) Balance at end of year $ 2,562 $ 3,329 $ 3,749

Bank Premises and Equipment (Ta

Bank Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Summary of Bank Premises and Equipment	A summary of Bank premises and equipment at December 31 follows: (in thousands) 2015 2014 Leasehold improvements $ 13,615 $ 13,866 Furniture and equipment 9,887 9,040 Subtotal 23,502 22,906 Accumulated depreciation and amortization (14,197 ) (13,047 ) Bank premises and equipment, net $ 9,305 $ 9,859

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2015
Banking and Thrift [Abstract]
Schedule of Time Deposits	A stratification of time deposits at December 31, 2015 and 2014 is presented in the following table: (in thousands) December 31, 2015 December 31, 2014 Time deposits of less than $100 thousand $ 39,534 $ 44,130 Time deposits of $100 thousand to $250 thousand 67,352 58,240 Time deposits of more than $250 thousand 54,571 47,344 Total time deposits $ 161,457 $ 149,714
Schedule of Maturities for Time Deposits	Scheduled maturities of time deposits at December 31, 2015 are presented as follows: (in thousands) 2016 2017 2018 2019 2020 Thereafter Total Scheduled maturities of time deposits $ 113,232 $ 23,482 $ 9,317 $ 7,482 $ 7,944 $ — $ 161,457

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Schedule of Subordinated Debentures	The following is a summary of the contractual terms of the subordinated debentures due to the Trusts as of December 31, 2015 : (in thousands) Subordinated debentures due to NorCal Community Bancorp Trust I on October 7, 2033 with interest payable quarterly, based on 3-month LIBOR plus 3.05%, repricing quarterly (3.37% as of December 31, 2015), redeemable, in whole or in part, on any interest payment date $ 4,124 Subordinated debentures due to NorCal Community Bancorp Trust II on March 15, 2036 with interest payable quarterly, based on 3-month LIBOR plus 1.40%, repricing quarterly (1.91% as of December 31, 2015), redeemable, in whole or in part, on any interest payment date 4,124 Total $ 8,248
Schedule of Borrowings	Borrowings at December 31, 2015 and 2014 are summarized as follows: 2015 2014 (dollars in thousands) Carrying Value Average Balance Average Rate Carrying Value Average Balance Average Rate FHLB overnight borrowings $ 52,000 $ 784 0.38 % $ — $ 4 — % FHLB fixed-rate advances $ 15,000 $ 15,000 2.07 % $ 15,000 $ 15,000 2.07 % Subordinated debentures $ 5,395 $ 5,288 7.94 % $ 5,185 $ 5,070 8.36 %

Stockholders' Equity and Stoc33

Stockholders' Equity and Stock Plans (Tables)	12 Months Ended
	Dec. 31, 2015
Equity [Abstract]
Schedule of Share-based Compensation, Stock Options, Activity	A summary of activity for stock options for the years ended December 31, 2015 , 2014 and 2013 is presented below. The intrinsic value of options outstanding and exercisable is calculated as the number of in-the-money options times the difference between the market price of our stock as of each year end presented and the exercise prices of the in-the-money options. Weighted Average Weighted Weighted Remaining Average Aggregate Average Contractual Number of Exercise Intrinsic Value Grant-Date Term Shares Price (in thousands) Fair Value (in years) Options outstanding at December 31, 2012 285,533 $ 31.73 $ 1,661 4.43 Granted 30,000 39.99 $ 10.59 Cancelled, expired or forfeited (23,840 ) 35.12 Exercised (71,237 ) 31.13 664 Options outstanding at December 31, 2013 220,456 32.74 2,349 4.05 Exercisable (vested) at December 31, 2013 163,301 31.09 2,008 2.56 Options outstanding at December 31, 2013 220,456 32.74 2,349 4.05 Granted 26,421 44.83 12.04 Cancelled, expired or forfeited (2,790 ) 39.01 Exercised (49,415 ) 29.39 771 Options outstanding at December 31, 2014 194,672 35.14 3,398 4.48 Exercisable (vested) at December 31, 2014 133,153 32.31 2,701 2.88 Options outstanding at December 31, 2014 194,672 35.14 3,398 4.48 Granted 28,320 50.70 12.21 Cancelled, expired or forfeited (652 ) 48.38 Exercised (37,071 ) 30.72 755 Options outstanding at December 31, 2015 185,269 38.35 2,788 5.00 Exercisable (vested) at December 31, 2015 114,581 34.12 2,209 3.21
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding	The following table shows the number, weighted average exercise price, intrinsic value, and weighted average remaining contractual life of options outstanding, vested and expected to vest as of December 31, 2015 . Number of options 179,883 Weighted average exercise price $ 38.14 Aggregate intrinsic value (in thousands) $ 2,745 Weighted average remaining contractual term (in years) 4.91
Schedule of Unrecognized Compensation Cost, Nonvested Awards	The following table summarizes non-vested restricted stock awards and changes during the years ended December 31, 2015 , 2014 and 2013 . Restricted Stock Awards Weighted Average Number of Grant-Date Shares Fair Value Non-vested awards at December 31, 2012 21,610 $ 34.05 Granted 11,850 39.96 Vested (6,941 ) 31.42 Forfeited (3,998 ) 36.19 Non-vested awards at December 31, 2013 22,521 37.59 Non-vested awards at December 31, 2013 22,521 $ 37.59 Granted 8,523 45.36 Vested (6,554 ) 34.65 Forfeited (2,067 ) 39.32 Non-vested awards at December 31, 2014 22,423 41.25 Non-vested awards at December 31, 2014 22,423 $ 41.25 Granted 15,970 50.75 Vested (6,555 ) 40.00 Forfeited (450 ) 48.45 Non-vested awards at December 31, 2015 31,388 46.24
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range	A summary of the options outstanding and exercisable by price range as of December 31, 2015 is presented in the following table: Stock Options Outstanding as of December 31, 2015 Stock Options Exercisable as of December 31, 2015 Remaining Weighted Weighted Stock Options Contractual Life Average Stock Options Average Range of Exercise Prices Outstanding (in years) Exercise Price Exercisable Exercise Price $20.01 - $25.00 13,138 3.3 $ 22.25 13,138 $ 22.25 $25.01 - $30.00 10,180 2.3 28.75 10,180 28.75 $30.01 - $35.00 41,270 1.3 33.67 41,270 33.67 $35.01 - $40.00 50,630 4.8 37.50 35,663 37.02 $40.01 - $45.00 29,551 6.9 41.95 11,220 41.89 $45.01 - $50.00 12,550 8.3 45.88 2,510 45.88 $45.01 - $50.00 27,950 9.2 50.70 600 50.27 185,269 5.0 38.35 114,581 34.12
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	The expected term of options granted is derived from historical data on employee exercise and post-vesting employment termination behavior. The risk-free rate for periods within the expected life of the option is based on the U.S. Treasury yield curve in effect at the time of the grant. Expected volatility is based on the historical volatility of the common stock over the most recent period that is generally commensurate with the expected life of the options. The weighted-average assumptions used in the pricing model are noted in the table below. Years ended December 31, 2015 2014 2013 Risk-free interest rate 1.67 % 2.04 % 1.60 % Expected dividend yield on common stock 1.75 % 1.70 % 1.80 % Expected life in years 6.0 6.0 6.8 Expected price volatility 28.06 % 30.32 % 30.01 %
Summary of Cash Dividends Paid to Common Shareholders	Presented below is a summary of cash dividends paid to common shareholders, recorded as a reduction of retained earnings. Years ended December 31, (in thousands except per share data) 2015 2014 2013 Cash dividends to common stockholders $ 5,390 $ 4,733 $ 3,970 Cash dividends per common share $ 0.90 $ 0.80 $ 0.73

Fair Value of Assets and Liab34

Fair Value of Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following table summarizes our assets and liabilities that were required to be recorded at fair value on a recurring basis. (in thousands) Description of Financial Instruments Carrying Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) December 31, 2015 Securities available-for-sale: Mortgage-backed securities and collateralized mortgage obligations issued by U.S. government-sponsored agencies $ 190,093 $ — $ 188,381 $ 1,712 Debentures of government-sponsored agencies $ 160,892 $ — $ 160,892 $ — Privately-issued collateralized mortgage obligations $ 4,150 $ — $ 4,150 $ — Obligations of state and political subdivisions $ 57,673 $ — $ 57,673 $ — Corporate bonds $ 4,979 $ — $ 4,979 $ — Derivative financial assets (interest rate contracts) $ 3 $ — $ 3 $ — Derivative financial liabilities (interest rate contracts) $ 1,658 $ — $ 1,658 $ — December 31, 2014 Securities available-for-sale: Mortgage-backed securities and collateralized mortgage obligations issued by U.S. government-sponsored agencies $ 158,119 $ — $ 155,421 $ 2,698 Debentures of government-sponsored agencies $ 14,557 $ — $ 14,557 $ — Privately-issued collateralized mortgage obligations $ 7,294 $ — $ 7,294 $ — Obligations of state and political subdivisions $ 15,880 $ — $ 15,771 $ — Corporate bonds $ 4,998 $ — $ 5,437 $ — Derivative financial assets (interest rate contracts) $ 61 $ — $ 61 $ — Derivative financial liabilities (interest rate contracts) $ 1,996 $ — $ 1,996 $ —
Fair Value Measurements, Nonrecurring	The following table presents the carrying value of financial instruments that were measured at fair value on a non-recurring basis and were still held in the consolidated statements of condition at each respective period end, by level within the fair value hierarchy as of December 31, 2015 and 2014 . (in thousands) Description of Financial Instruments Carrying Value 1 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) 1 December 31, 2015 Other real estate $ 421 $ — $ — $ 421 December 31, 2014 Impaired loans carried at fair value: Installment and other consumer 1 $ 77 $ — $ — $ 77 Other real estate $ 461 $ — $ — $ 461 1 Represents collateral-dependent loan principal balances that had been generally written down to the values of the underlying collateral, net of specific valuation allowances. At December 31, 2014, the $77 thousand carrying value of a consumer loan was net of a $26 thousand specific valuation allowance. The carrying value of loans fully charged-off, which includes unsecured lines of credit, overdrafts and all other loans, is zero. When a loan is identified as impaired, it is reported at the lower of cost or fair value, measured based on the loan's observable market price (Level 1) or the current net realizable value of the underlying collateral securing the loan, if the loan is collateral dependent (Level 3). Net realizable value of the underlying collateral is the fair value of the collateral less estimated selling costs and any prior liens. Appraisals, recent comparable sales, offers and listing prices are factored in when valuing the collateral. We review and verify the qualifications and licenses of the certified general appraisers used for appraising commercial properties or certified residential appraisers for residential properties. Real estate appraisals may utilize a combination of approaches including replacement cost, sales comparison and the income approach. Comparable sales and income data are analyzed by the appraisers and adjusted to reflect differences between them and the subject property such as type, leasing status and physical condition. When appraisals are received, Management reviews the assumptions and methodology utilized in the appraisal as well as the overall resulting value in conjunction with independent data sources such as recent market data and industry-wide statistics. We generally use a 6% discount for selling costs which is applied to all properties, regardless of size. Appraised values may be adjusted to reflect changes in market conditions that have occurred subsequent to the appraisal date, or for revised estimates regarding the timing or cost of the property sale. These adjustments are based on qualitative judgments made by Management on a case-by-case basis and are generally unobservable valuation inputs as they are specific to each underlying collateral. There have been no significant changes in the valuation techniques during the period ended December 31, 2015 . OREO represents collateral acquired through foreclosure and is initially recorded at fair value as established by a current appraisal, adjusted for disposition costs. Subsequently, OREO is measured at lower of cost or fair value. OREO values are reviewed on an ongoing basis and any subsequent decline in fair value is recorded as a foreclosed asset expense in the current period. The value of OREO is determined based on independent appraisals, similar to the process used for impaired loans, discussed above, and is classified as Level 3. There was a $40 thousand decline in the estimated fair value of the OREO during the year ended December 31, 2015 . The OREO was acquired from Bank of Alameda as part of the NorCal Acquisition.
Fair Value, by Balance Sheet Grouping	The table below is a summary of fair value estimates for financial instruments as of December 31, 2015 and 2014 , excluding financial instruments recorded at fair value on a recurring basis (summarized in the first table in this note). The carrying amounts in the following table are recorded in the consolidated statements of condition under the indicated captions. We have excluded non-financial assets and non-financial liabilities defined by the Codification (ASC 820-10-15-1A), such as Bank premises and equipment, deferred taxes and other liabilities. In addition, we have not disclosed the fair value of financial instruments specifically excluded from disclosure requirements of the Financial Instruments Topic of the Codification (ASC 825-10-50-8), such as Bank-owned life insurance policies. December 31, 2015 December 31, 2014 (in thousands) Carrying Amounts Fair Value Fair Value Hierarchy Carrying Amounts Fair Value Fair Value Hierarchy Financial assets: Cash and cash equivalents $ 26,343 $ 26,343 Level 1 $ 41,367 $ 41,367 Level 1 Investment securities held-to-maturity 69,637 71,054 Level 2 116,437 118,643 Level 2 Loans, net 1,436,229 1,470,380 Level 3 1,348,252 1,361,244 Level 3 Interest receivable 6,643 6,643 Level 2 5,909 5,909 Level 2 Financial liabilities: Deposits 1,728,226 1,728,717 Level 2 1,551,619 1,552,446 Level 2 Federal Home Loan Bank borrowing 67,000 67,279 Level 2 15,000 15,484 Level 2 Subordinated debentures 5,395 5,132 Level 3 5,185 5,290 Level 3 Interest payable 187 187 Level 2 213 213 Level 2

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	The current and deferred components of the income tax provision for each of the three years ended December 31 are as follows: (in thousands) 2015 2014 2013 Current tax provision Federal $ 7,097 $ 8,523 $ 6,717 State 2,931 3,195 2,574 Total current 10,028 11,718 9,291 Deferred tax provision (benefit) Federal 382 (146 ) (873 ) State 80 126 (479 ) Total deferred 462 (20 ) (1,352 ) Total income tax provision $ 10,490 $ 11,698 $ 7,939
Schedule of Deferred Tax Assets and Liabilities	The following table shows the tax effect of our cumulative temporary differences as of December 31: (in thousands) 2015 2014 Deferred tax assets: Allowance for loan losses and off-balance sheet credit commitments $ 5,918 $ 5,544 Net operating loss carryforwards from the NorCal Acquisition 4,090 4,598 Deferred compensation plan and salary continuation plan 1,619 1,499 Fair value adjustment on loans acquired from the NorCal Acquisition 1,197 1,647 Accrued but unpaid expenses 1,188 1,119 State franchise tax 1,005 1,100 Interest received on non-accrual loans 864 651 Deferred rent and other lease incentives 595 584 Other real estate owned 448 448 Stock-based compensation 273 231 Depreciation and disposals on premises and equipment 231 94 Accretion on loans and investment securities 110 630 Net unrealized loss on securities available-for-sale 59 — Other 174 195 Total gross deferred tax assets 17,771 18,340 Deferred tax liabilities: Deferred loan origination costs and fees (2,567 ) (2,385 ) Core deposit intangible asset (1,309 ) (1,569 ) Unaccreted discount on subordinated debentures from the NorCal Acquisition (1,200 ) (1,288 ) Net unrealized gain on securities available-for-sale — (498 ) Total gross deferred tax liabilities (5,076 ) (5,740 ) Net deferred tax assets $ 12,695 $ 12,600
Schedule of Effective Income Tax Rate Reconciliation	The effective tax rate for 2015 , 2014 and 2013 differs from the current Federal statutory income tax rate as follows: 2015 2014 2013 Federal statutory income tax rate 35.0 % 35.0 % 35.0 % Increase (decrease) due to: California franchise tax, net of federal tax benefit 6.8 % 6.8 % 6.5 % Tax exempt interest on municipal securities and loans (4.2 )% (3.3 )% (4.0 )% Tax exempt earnings on bank owned life insurance (1.0 )% (0.9 )% (1.5 )% Low income housing tax credits (0.2 )% (0.1 )% (0.3 )% Other (0.1 )% (0.3 )% — % Effective Tax Rate 36.3 % 37.2 % 35.7 %

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	At December 31, 2015, the approximate minimum future commitments payable under non-cancelable contracts for leased premises are as follows: (in thousands) 2016 2017 2018 2019 2020 Thereafter Total Operating leases 1 $ 3,763 $ 3,755 $ 3,784 $ 3,526 $ 3,018 $ 3,659 $ 21,505

Derivative Financial Instrume37

Derivative Financial Instruments and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	Information on our derivatives follows: Asset derivatives Liability derivatives (in thousands) December 31, 2015 December 31, 2014 December 31, 2015 December 31, 2014 Fair value hedges: Interest rate contracts notional amount $ 4,407 $ 4,589 $ 22,187 $ 26,899 Interest rate contracts fair value 1 $ 3 $ 61 $ 1,658 $ 1,996
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance	Years ended December 31, (in thousands) 2015 2014 2013 Increase (decrease) in value of designated interest rate swaps recognized in interest income $ 280 $ (377 ) $ 3,680 Payment on interest rate swaps recorded in interest income (918 ) (1,002 ) (1,422 ) Decrease (increase) in value of hedged loans recognized in interest income (308 ) 662 (3,971 ) Decrease in value of yield maintenance agreement recognized against interest income (52 ) (91 ) (71 ) Net loss on derivatives recognized against interest income 2 $ (998 ) $ (808 ) $ (1,784 ) 1 See Note 10 for valuation methodology. 2 Includes hedge ineffectiveness loss of $80 thousand , gain of $194 thousand and loss of $362 thousand for the years December 31, 2015 , 2014 and 2013 , respectively. Changes in value of swaps were included in the assessment of hedge effectiveness.
Offsetting Assets	Information on financial instruments that are eligible for offset in the consolidated statements of condition follows: Offsetting of Financial Assets and Derivative Assets Gross Amounts Not Offset in the Statements of Condition Gross Amounts Net Amounts Gross Amounts Offset in the of Assets Presented of Recognized Statements of in the Statements Financial Cash Collateral (in thousands) Assets 1 Condition of Condition 1 Instruments Received Net Amount As of December 31, 2015 Derivatives by Counterparty Counterparty A $ 3 $ — $ 3 $ (3 ) $ — $ — Counterparty B — — — — — — Total $ 3 $ — $ 3 $ (3 ) $ — $ — As of December 31, 2014 Derivatives by Counterparty Counterparty A $ 61 $ — $ 61 $ (61 ) $ — $ — Counterparty B — — — — — — Total $ 61 $ — $ 61 $ (61 ) $ — $ — 1 Amounts exclude accrued interest totaling $1 thousand at both December 31, 2015 and December 31, 2014, respectively. Offsetting of Financial Liabilities and Derivative Liabilities Gross Amounts Not Offset in the Statements of Condition Gross Amounts Net Amounts of Gross Amounts Offset in the Liabilities Presented of Recognized Statements of in the Statements of Financial Cash Collateral (in thousands) Liabilities 2 Condition Condition 2 Instruments Pledged Net Amount As of December 31, 2015 Derivatives by Counterparty Counterparty A $ 1,390 $ — $ 1,390 $ (3 ) (1,387 ) $ — Counterparty B 268 — 268 — (268 ) — Total $ 1,658 $ — $ 1,658 $ (3 ) $ (1,655 ) $ — As of December 31, 2014 Derivatives by Counterparty Counterparty A $ 1,616 $ — $ 1,616 $ (61 ) $ (1,360 ) $ 195 Counterparty B 380 — 380 — (380 ) — Total $ 1,996 $ — $ 1,996 $ (61 ) $ (1,740 ) $ 195
Offsetting Liabilities	Offsetting of Financial Liabilities and Derivative Liabilities Gross Amounts Not Offset in the Statements of Condition Gross Amounts Net Amounts of Gross Amounts Offset in the Liabilities Presented of Recognized Statements of in the Statements of Financial Cash Collateral (in thousands) Liabilities 2 Condition Condition 2 Instruments Pledged Net Amount As of December 31, 2015 Derivatives by Counterparty Counterparty A $ 1,390 $ — $ 1,390 $ (3 ) (1,387 ) $ — Counterparty B 268 — 268 — (268 ) — Total $ 1,658 $ — $ 1,658 $ (3 ) $ (1,655 ) $ — As of December 31, 2014 Derivatives by Counterparty Counterparty A $ 1,616 $ — $ 1,616 $ (61 ) $ (1,360 ) $ 195 Counterparty B 380 — 380 — (380 ) — Total $ 1,996 $ — $ 1,996 $ (61 ) $ (1,740 ) $ 195 2 Amounts exclude accrued interest totaling $27 thousand and $39 thousand at December 31, 2015 and December 31, 2014, respectively.

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2015
Banking and Thrift [Abstract]
Schedule of Capital Adequacy Ratios	To be categorized as well capitalized the Bank must maintain minimum total risk-based, Tier 1 risk-based, Tier 1 leverage, and common equity Tier 1 ratios as set forth in the second table below. The most recent notification from the FDIC categorized the Bank as well capitalized under the regulatory framework for prompt corrective action as of December 31, 2015. There are no conditions or events since that notification that Management believes have changed the Bank’s categories and we expect the Bank to remain well capitalized under the minimum requirements for capital adequacy in accordance with Basel III rules for prompt corrective action pursuant to Section 38 of the Federal Deposit Insurance Act on a fully phased-in basis. The Bancorp’s and Bank's capital adequacy ratios as of December 31, 2015 and 2014 are presented in the following tables. Bancorp's Tier 1 capital includes the subordinated debentures, which are not included at the Bank level. We continued to deploy capital in 2015 accumulated from net income into lending and investing. Capital Ratios for Bancorp (dollars in thousands) Actual Ratio Ratio for Capital Adequacy Purposes As of December 31, 2015 Amount Ratio Amount Ratio Total Capital (to risk-weighted assets) $ 227,269 13.37 % ≥ $ 135,996 ≥ 8.0 % Tier 1 Capital (to risk-weighted assets) $ 211,521 12.44 % ≥ $ 101,997 ≥ 6.0 % Tier 1 Capital (to average assets) $ 211,521 10.67 % ≥ $ 79,296 ≥ 4.0 % Common Equity Tier 1 (to risk-weighted assets) $ 206,724 12.16 % ≥ $ 76,498 ≥ 4.5 % As of December 31, 2014 Total Capital (to risk-weighted assets) $ 210,067 13.94 % ≥ $ 120,580 ≥ 8.0 % Tier 1 Capital (to risk-weighted assets) $ 193,956 12.87 % ≥ $ 60,290 ≥ 4.0 % Tier 1 Capital (to average assets) $ 193,956 10.62 % ≥ $ 73,079 ≥ 4.0 % Capital Ratios for the Bank (dollars in thousands) Actual Ratio Ratio for Capital Adequacy Purposes Ratio to be Well Capitalized under Prompt Corrective Action Provisions As of December 31, 2015 Amount Ratio Amount Ratio Amount Ratio Total Capital (to risk-weighted assets) $ 222,830 13.11 % ≥ $ 135,968 ≥ 8.0 % ≥ $ 169,960 ≥ 10.0 % Tier 1 Capital (to risk-weighted assets) $ 207,082 12.18 % ≥ $ 101,976 ≥ 6.0 % ≥ $ 135,968 ≥ 8.0 % Tier 1 Capital (to average assets) $ 207,082 10.45 % ≥ $ 79,268 ≥ 4.0 % ≥ $ 99,085 ≥ 5.0 % Common Equity Tier 1 (to risk-weighted assets) $ 207,082 12.18 % ≥ $ 76,482 ≥ 4.5 % ≥ $ 110,474 ≥ 6.5 % As of December 31, 2014 Total Capital (to risk-weighted assets) $ 206,465 13.70 % ≥ $ 120,553 ≥ 8.0 % ≥ $ 150,692 ≥ 10.0 % Tier 1 Capital (to risk-weighted assets) $ 190,354 12.63 % ≥ $ 60,277 ≥ 4.0 % ≥ $ 90,415 ≥ 6.0 % Tier 1 Capital (to average assets) $ 190,354 10.42 % ≥ $ 73,064 ≥ 4.0 % ≥ $ 91,330 ≥ 5.0 %

Condensed Bank of Marin Banco39

Condensed Bank of Marin Bancorp Parent Only Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Schedule of Condensed Balance Sheet	Presented below is financial information for Bank of Marin Bancorp, parent holding company only. CONDENSED UNCONSOLIDATED STATEMENTS OF CONDITION December 31, 2015 and 2014 (in thousands) 2015 2014 Assets Cash and due from Bank of Marin $ 3,796 $ 3,228 Investment in bank subsidiary 215,722 201,609 Other assets 770 454 Total assets $ 220,288 $ 205,291 Liabilities and Stockholders' Equity Subordinated debentures $ 5,395 $ 5,185 Accrued expenses payable 109 80 Other liabilities 311 — Total liabilities 5,815 5,265 Stockholders' equity 214,473 200,026 Total liabilities and stockholders' equity $ 220,288 $ 205,291
Schedule of Condensed Income Statement	CONDENSED UNCONSOLIDATED STATEMENTS OF INCOME Years ended December 31, 2015, 2014 and 2013 (in thousands) 2015 2014 2013 Income Dividends from bank subsidiary $ 6,500 $ — $ 28,000 Miscellaneous Income 6 8 — Total income 6,506 8 28,000 Expense Interest expense 420 421 34 Non-interest expense 973 851 1,313 Total expense 1,393 1,272 1,347 Income (loss) before income taxes and equity in undistributed net income of subsidiary 5,113 (1,264 ) 26,653 Income tax benefit 583 532 382 Income (loss) before equity in undistributed net income of subsidiary 5,696 (732 ) 27,035 Earnings of bank subsidiary greater (less) than dividends received from bank subsidiary 12,745 20,503 (12,765 ) Net income $ 18,441 $ 19,771 $ 14,270
Schedule of Condensed Cash Flow Statement	CONDENSED UNCONSOLIDATED STATEMENTS OF CASH FLOWS Years ended December 31, 2015, 2014 and 2013 (in thousands) 2015 2014 2013 Cash Flows from Operating Activities: Net income $ 18,441 $ 19,771 $ 14,270 Adjustments to reconcile net income to net cash provided by(used in) operating activities: Earnings of bank subsidiary (greater) less than dividends received from bank subsidiary (12,745 ) (20,503 ) 12,765 Net change in operating assets and liabilities: Accretion of discount on subordinated debentures 210 216 19 Other assets (298 ) (88 ) 74 Intercompany receivable (18 ) — — Other liabilities 368 (99 ) 165 Net cash provided by (used in) operating activities 5,958 (703 ) 27,293 Cash Flows from Investing Activities: Capital contribution to subsidiary (1,156 ) (1,475 ) (2,258 ) Cash consideration paid for acquisition, net of cash acquired — — (15,952 ) Net cash used in investing activities (1,156 ) (1,475 ) (18,210 ) Cash Flows from Financing Activities: Stock options exercised and stock purchases 1,156 1,475 2,258 Dividends paid on common stock (5,390 ) (4,733 ) (3,970 ) Net cash used by financing activities (4,234 ) (3,258 ) (1,712 ) Net increase (decrease) in cash and cash equivalents 568 (5,436 ) 7,371 Cash and cash equivalents at beginning of period 3,228 8,664 1,293 Cash and cash equivalents at end of period $ 3,796 $ 3,228 $ 8,664 Supplemental schedule of non-cash investing and financing activities: Stock issued in payment of director fees $ 275 $ 236 $ 222 Acquisition: Fair value of assets acquired $ — $ — $ 39,503 Fair value of liabilities assumed $ — $ — $ 4,970 Stock issued to NorCal Community Bancorp shareholders $ — $ — $ 18,514

Summary of Significant Accoun40

Summary of Significant Accounting Policies - Premises and Equipment (Details)	12 Months Ended
	Dec. 31, 2015
Furniture and equipment
Property, Plant and Equipment [Line Items]
Premises and equipment useful life	8 years
Minimum | Equipment
Property, Plant and Equipment [Line Items]
Premises and equipment useful life	3 years
Maximum | Equipment
Property, Plant and Equipment [Line Items]
Premises and equipment useful life	20 years

Summary of Significant Accoun41

Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share, Basic and Diluted [Abstract]
Weighted average basic shares outstanding (in shares)	5,966	5,893	5,457
Potential common shares related to stock options (in shares)	41	43	44
Potential common shares related to unvested restricted stock awards (in shares)	5	5	4
Potential common shares related to warrants (in shares)	53	65	53
Weighted average diluted shares outstanding (in shares)	6,065	6,006	5,558
Net income	$ 18,441	$ 19,771	$ 14,270
Basic EPS (in dollars per share)	$ 3.09	$ 3.35	$ 2.62
Diluted EPS (in dollars per share)	$ 3.04	$ 3.29	$ 2.57
Weighted average anti-dilutive shares not included in the calculation of diluted EPS (shares)	36	45	49

Summary of Significant Accoun42

Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)branchcontract	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Accounting Policies [Abstract]
Threshold period a past due loan is charged off	90 days
Threshold period a past due overdraft account is charged off	60 days
Derivatives, Fair Value [Line Items]
Advertising costs | $	$ 334	$ 400	$ 490
Interest rate swap | Designated as hedging instrument | Shortcut hedge accounting
Derivatives, Fair Value [Line Items]
Number of instrument rate swap contracts accounted for using hedge accounting | contract	1
Interest rate swap | Designated as hedging instrument | Non-shortcut Hedge Accounting
Derivatives, Fair Value [Line Items]
Number of instrument rate swap contracts accounted for using hedge accounting | contract	6
Marin County
Derivatives, Fair Value [Line Items]
Number of branches	10
Napa County
Derivatives, Fair Value [Line Items]
Number of branches	1
San Francisco
Derivatives, Fair Value [Line Items]
Number of branches	1
Sonoma County
Derivatives, Fair Value [Line Items]
Number of branches	5
Alameda County
Derivatives, Fair Value [Line Items]
Number of branches	3

Acquisition - Narrative (Detail

Acquisition - Narrative (Details)	1 Months Ended	12 Months Ended
	Dec. 31, 2013USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Nov. 29, 2013USD ($)branch
Business Acquisition [Line Items]
Goodwill		$ 6,436,000	$ 6,436,000
Impairment on goodwill		0	0
Impairment loss on core deposit intangible asset		0	0
Future amortization expense:
Total		3,113,000	3,732,000
Business Acquisition, Pro Forma Information [Abstract]
Interest income included in acquired operations		67,187,000	70,441,000	$ 58,775,000
Interest expense included in acquired operations		2,251,000	2,349,000	1,785,000
Non-interest income included in acquired operations		9,193,000	9,041,000	8,066,000
Non-interest expense included in acquired operations		46,949,000	47,263,000	44,092,000
Income before income taxes included in acquired operations		$ 28,931,000	31,469,000	$ 22,209,000
NorCal Community Bancorp
Business Acquisition [Line Items]
Loans acquired					$ 173,800,000
Deposits acquired					241,000,000
Investment securities					$ 53,700,000
Number of branches | branch					4
Goodwill					$ 6,400,000
Period core deposit is amortized for income tax purposes		10 years
Future amortization expense:
2,016		$ 533,000
2,017		472,000
2,018		413,000
2,019		388,000
2,020		365,000
Thereafter		942,000
Total		3,113,000
Business Acquisition, Pro Forma Information [Abstract]
Interest income included in acquired operations	$ 1,100,000
Interest expense included in acquired operations	68,000
Non-interest income included in acquired operations	95,000
Non-interest expense included in acquired operations	1,100,000
Income before income taxes included in acquired operations	109,000
Core Deposits | NorCal Community Bancorp
Business Acquisition [Line Items]
Core deposit intangible asset					$ 4,600,000
Amount of core deposit intangible asset amortized	$ 69,000	$ 619,000	$ 771,000

Acquisition - Pro Forma Revenue

Acquisition - Pro Forma Revenue and Earnings (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
NorCal Community Bancorp
Business Acquisition [Line Items]
Actual revenue since acquisition date	$ 1,239
Actual earnings since acquisition date	$ 70
Pro forma revenue			$ 79,586
Earnings			14,514
Acquisition related expenses		$ 746	$ 3,744
Bancorp
Business Acquisition [Line Items]
Acquisition related expenses		3,700
NorCal Community Bancorp
Business Acquisition [Line Items]
Acquisition related expenses		$ 1,900

Acquisition - Acquisition Relat

Acquisition - Acquisition Related Costs (Details) - NorCal Community Bancorp - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Acquisition related expenses	$ 746	$ 3,744
Data processing
Business Acquisition [Line Items]
Acquisition related expenses	442	2,807
Professional services
Business Acquisition [Line Items]
Acquisition related expenses	0	660
Personnel severance
Business Acquisition [Line Items]
Acquisition related expenses	304	203
Other
Business Acquisition [Line Items]
Acquisition related expenses	$ 0	$ 74

Investment Securities - Amortiz

Investment Securities - Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Held to maturity, Amortized Cost	$ 69,637	$ 116,437
Held-to-maturity, Fair Value	71,054	118,643
Held-to-maturity, Gross Unrealized Gains	1,459	2,271
Held-to-maturity, Gross Unrealized (Losses)	(42)	(65)
Available for sale, Amortized Cost	417,410	199,045
Available for sale, Fair Value	417,787	200,848
Available-for-sale, Gross Unrealized Gains	1,883	2,234
Available-for-sale, Gross Unrealized (Losses)	(1,506)	(431)
Total investment securities, Amortized Cost	487,047	315,482
Total investment securities, Fair Value	488,841	319,491
Total investment securities, Gross Unrealized Gains	3,342	4,505
Total investment securities, Gross Unrealized (Losses)	(1,548)	(496)
MBS pass-through securities
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for sale, Amortized Cost	138,222	92,963
Available for sale, Fair Value	138,462	94,214
Available-for-sale, Gross Unrealized Gains	694	1,262
Available-for-sale, Gross Unrealized (Losses)	(454)	(11)
CMOs issued by FNMA
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for sale, Amortized Cost	18,266	14,771
Available for sale, Fair Value	18,219	14,790
Available-for-sale, Gross Unrealized Gains	97	77
Available-for-sale, Gross Unrealized (Losses)	(144)	(58)
CMOs issued by FHLMC
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for sale, Amortized Cost	22,889	31,238
Available for sale, Fair Value	22,932	31,260
Available-for-sale, Gross Unrealized Gains	82	109
Available-for-sale, Gross Unrealized (Losses)	(39)	(87)
CMOs issued by GNMA
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for sale, Amortized Cost	10,326	17,573
Available for sale, Fair Value	10,480	17,855
Available-for-sale, Gross Unrealized Gains	169	298
Available-for-sale, Gross Unrealized (Losses)	(15)	(16)
Debentures of government-sponsored agencies
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for sale, Amortized Cost	161,690	14,694
Available for sale, Fair Value	160,892	14,557
Available-for-sale, Gross Unrealized Gains	28	95
Available-for-sale, Gross Unrealized (Losses)	(826)	(232)
Privately-issued CMOs
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for sale, Amortized Cost	3,960	7,137
Available for sale, Fair Value	4,150	7,294
Available-for-sale, Gross Unrealized Gains	190	172
Available-for-sale, Gross Unrealized (Losses)	0	(15)
Obligations of state and political subdivisions
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Held to maturity, Amortized Cost	42,919	63,425
Held-to-maturity, Fair Value	44,146	65,121
Held-to-maturity, Gross Unrealized Gains	1,246	1,736
Held-to-maturity, Gross Unrealized (Losses)	(19)	(40)
Available for sale, Amortized Cost	57,110	15,733
Available for sale, Fair Value	57,673	15,880
Available-for-sale, Gross Unrealized Gains	580	155
Available-for-sale, Gross Unrealized (Losses)	(17)	(8)
Corporate bonds
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Held to maturity, Amortized Cost	15,072	40,257
Held-to-maturity, Fair Value	15,098	40,448
Held-to-maturity, Gross Unrealized Gains	42	216
Held-to-maturity, Gross Unrealized (Losses)	(16)	(25)
Available for sale, Amortized Cost	4,947	4,936
Available for sale, Fair Value	4,979	4,998
Available-for-sale, Gross Unrealized Gains	43	66
Available-for-sale, Gross Unrealized (Losses)	(11)	(4)
MBS pass-through securities
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Held to maturity, Amortized Cost	11,646	12,755
Held-to-maturity, Fair Value	11,810	13,074
Held-to-maturity, Gross Unrealized Gains	171	319
Held-to-maturity, Gross Unrealized (Losses)	$ (7)	$ 0

Investment Securities - Maturit

Investment Securities - Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Held to Maturity, Amortized Cost, Within one year	$ 18,853	$ 39,778
Held to Maturity, Fair Value, Within one year	18,920	39,913
Available for Sale Securities, Amortized Cost, Within one year	12,135	2,378
Available for Sale Securities, Debt Maturities, Fair Value, Within one year	12,176	2,388
Held to Maturity, Amortized Cost, After one but within five years	31,677	50,983
Held to Maturity, Fair Value, After one but within five years	32,360	51,953
Available for Sale, Amortized Cost, After one but within five years	188,007	43,866
Available for Sale, Fair Value, After one but within five years	187,326	43,919
Held to Maturity, Amortized Cost, After five years through ten years	8,580	11,679
Held to Maturity, Fair Value, After five years through ten years	8,969	12,426
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	64,899	9,644
Available for Sale, Fair Value, After five years through ten years	64,999	9,749
Held to Maturity, Amortized Cost, After ten years	10,527	13,997
Held to Maturity, Fair Value, After ten years	10,805	14,351
Available for Sale, Amortized Cost, After five years through ten years	152,369	143,157
Available for Sale, Fair Value, After ten years	153,286	144,792
Held to Maturity, Amortized Cost, Total	69,637	116,437
Held-to-Maturity, Fair Value, Total	71,054	118,643
Available for Sale, Amortized Cost, Total	417,410	199,045
Available for Sale, Fair Value, Total	$ 417,787	$ 200,848

Investment Securities - Securit

Investment Securities - Securities Sold and Pledged as Collateral (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financial Instruments Owned and Pledged as Collateral [Line Items]
Proceeds from sale of available-for-sale securities	$ 2,099	$ 2,436	$ 7,973
Available-for-sale Securities, Gross Realized Gains	7	4	86
Proceeds from sale of held-to-maturity securities	1,015	2,146	6,442
Net loss on sale of available for sale securities sold	(1)	(28)	(104)
Net gain on sale of held to maturity securities sold	73	104	67
Held-to-maturity Securities, Sold Security, Realized Loss	0	0	$ (50)
State of California
Financial Instruments Owned and Pledged as Collateral [Line Items]
Available-for-sale securities pledged as collateral	87,900	74,700
Public Deposits
Financial Instruments Owned and Pledged as Collateral [Line Items]
Available-for-sale securities pledged as collateral	87,100	73,800
Trust Deposits
Financial Instruments Owned and Pledged as Collateral [Line Items]
Available-for-sale securities pledged as collateral	840	856
Internal checking account
Financial Instruments Owned and Pledged as Collateral [Line Items]
Available-for-sale securities pledged as collateral	$ 1,100	$ 1,100

Investment Securities - Other T

Investment Securities - Other Than Temporarily Impaired Debt Securities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)security	Dec. 31, 2014USD ($)security	Dec. 31, 2013USD ($)
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Number of securities considered other than temporarily impaired | security	0
Other-than-temporary impairment on securities available-for-sale	$ 0	$ 13	$ 0
Number of investment securities in unrealized loss positions | security	54	28
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Held-to-maturity, Less than 12 continuous months, Fair value	$ 14,152	$ 8,839
Held-to-maturity, Less than 12 continuous months, Unrealized loss	(41)	(28)
Held-to-maturity, Greater than 12 continuous months, Fair value	1,999	3,892
Held-to-maturity, Greater than 12 continuous months, Unrealized loss	(1)	(37)
Held-to-maturity, Total securities in a loss position, Fair value	16,151	12,731
Held-to-maturity, Total securities in a loss position, Unrealized loss	(42)	(65)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale, Less than 12 continuous months, Fair value	221,857	27,387
Available-for-sale, Less than 12 continuous months, Unrealized loss	(1,273)	(91)
Available-for-sale, Greater than 12 continuous months, Fair value	17,987	18,277
Available-for-sale, Greater than 12 continuous months, Unrealized loss	(233)	(340)
Available-for-sale, Total securities in a loss position, Fair value	239,844	45,664
Available-for-sale, Total securities in a loss position, Unrealized loss	(1,506)	(431)
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] [Abstract]
Total temporarily impaired securities, Less than 12 continuous months, Fair value	236,009	36,226
Total temporarily impaired securities, Less than 12 continuous months, Unrealized loss	(1,314)	(119)
Total temporarily impaired securities, Greater than 12 continuous months, Fair value	19,986	22,169
Total temporarily impaired securities, Greater than 12 continuous months, Unrealized loss	(234)	(377)
Total temporarily impaired securities, Total securities in a loss position, Fair value	255,995	58,395
Total temporarily impaired securities, Total securities in a loss position, Unrealized loss	$ (1,548)	(496)
Number of securities in continuous loss position for more than 12 months | security	6
Number of securities in continuous loss position for less than 12 months | security	48
Net loss on sale of available for sale securities sold	$ 1	28	$ 104
Collateralized Mortgage Obligations
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] [Abstract]
Number of securities in continuous loss position for more than 12 months | security	3
CMOs issued by FNMA
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale, Less than 12 continuous months, Fair value	$ 9,277	0
Available-for-sale, Less than 12 continuous months, Unrealized loss	(80)	0
Available-for-sale, Greater than 12 continuous months, Fair value	3,158	4,115
Available-for-sale, Greater than 12 continuous months, Unrealized loss	(64)	(58)
Available-for-sale, Total securities in a loss position, Fair value	12,435	4,115
Available-for-sale, Total securities in a loss position, Unrealized loss	(144)	(58)
CMOs issued by FHLMC
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale, Less than 12 continuous months, Fair value	0	17,157
Available-for-sale, Less than 12 continuous months, Unrealized loss	0	(44)
Available-for-sale, Greater than 12 continuous months, Fair value	1,989	2,291
Available-for-sale, Greater than 12 continuous months, Unrealized loss	(39)	(43)
Available-for-sale, Total securities in a loss position, Fair value	1,989	19,448
Available-for-sale, Total securities in a loss position, Unrealized loss	(39)	(87)
Privately-issued CMOs
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale, Less than 12 continuous months, Fair value		817
Available-for-sale, Less than 12 continuous months, Unrealized loss		(15)
Available-for-sale, Greater than 12 continuous months, Fair value		0
Available-for-sale, Greater than 12 continuous months, Unrealized loss		0
Available-for-sale, Total securities in a loss position, Fair value		817
Available-for-sale, Total securities in a loss position, Unrealized loss		(15)
CMOs issued by GNMA
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale, Less than 12 continuous months, Fair value	164	3,262
Available-for-sale, Less than 12 continuous months, Unrealized loss	0	(16)
Available-for-sale, Greater than 12 continuous months, Fair value	2,374	0
Available-for-sale, Greater than 12 continuous months, Unrealized loss	(15)	0
Available-for-sale, Total securities in a loss position, Fair value	2,538	3,262
Available-for-sale, Total securities in a loss position, Unrealized loss	(15)	(16)
Debentures of government-sponsored agencies
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale, Less than 12 continuous months, Fair value	136,064	494
Available-for-sale, Less than 12 continuous months, Unrealized loss	(713)	(1)
Available-for-sale, Greater than 12 continuous months, Fair value	9,887	9,769
Available-for-sale, Greater than 12 continuous months, Unrealized loss	(113)	(231)
Available-for-sale, Total securities in a loss position, Fair value	145,951	10,263
Available-for-sale, Total securities in a loss position, Unrealized loss	(826)	(232)
MBS pass-through securities
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale, Less than 12 continuous months, Fair value	68,809	1,960
Available-for-sale, Less than 12 continuous months, Unrealized loss	(454)	(11)
Available-for-sale, Greater than 12 continuous months, Fair value	0	0
Available-for-sale, Greater than 12 continuous months, Unrealized loss	0	0
Available-for-sale, Total securities in a loss position, Fair value	68,809	1,960
Available-for-sale, Total securities in a loss position, Unrealized loss	(454)	(11)
MBS pass-through securities
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Held-to-maturity, Less than 12 continuous months, Fair value	2,332
Held-to-maturity, Less than 12 continuous months, Unrealized loss	(7)
Held-to-maturity, Greater than 12 continuous months, Fair value	0
Held-to-maturity, Greater than 12 continuous months, Unrealized loss	0
Held-to-maturity, Total securities in a loss position, Fair value	2,332
Held-to-maturity, Total securities in a loss position, Unrealized loss	(7)	0
Obligations of state and political subdivisions
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Held-to-maturity, Less than 12 continuous months, Fair value	8,297	5,830
Held-to-maturity, Less than 12 continuous months, Unrealized loss	(19)	(27)
Held-to-maturity, Greater than 12 continuous months, Fair value	0	359
Held-to-maturity, Greater than 12 continuous months, Unrealized loss	0	(13)
Held-to-maturity, Total securities in a loss position, Fair value	8,297	6,189
Held-to-maturity, Total securities in a loss position, Unrealized loss	(19)	(40)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale, Less than 12 continuous months, Fair value	4,557	2,695
Available-for-sale, Less than 12 continuous months, Unrealized loss	(15)	(3)
Available-for-sale, Greater than 12 continuous months, Fair value	579	1,112
Available-for-sale, Greater than 12 continuous months, Unrealized loss	(2)	(5)
Available-for-sale, Total securities in a loss position, Fair value	5,136	3,807
Available-for-sale, Total securities in a loss position, Unrealized loss	(17)	(8)
Corporate bonds
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Held-to-maturity, Less than 12 continuous months, Fair value	3,523	3,009
Held-to-maturity, Less than 12 continuous months, Unrealized loss	(15)	(1)
Held-to-maturity, Greater than 12 continuous months, Fair value	1,999	3,533
Held-to-maturity, Greater than 12 continuous months, Unrealized loss	(1)	(24)
Held-to-maturity, Total securities in a loss position, Fair value	5,522	6,542
Held-to-maturity, Total securities in a loss position, Unrealized loss	(16)	(25)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale, Less than 12 continuous months, Fair value	2,986	1,002
Available-for-sale, Less than 12 continuous months, Unrealized loss	(11)	(1)
Available-for-sale, Greater than 12 continuous months, Fair value	0	990
Available-for-sale, Greater than 12 continuous months, Unrealized loss	0	(3)
Available-for-sale, Total securities in a loss position, Fair value	2,986	1,992
Available-for-sale, Total securities in a loss position, Unrealized loss	$ (11)	$ (4)
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] [Abstract]
Number of securities in continuous loss position for more than 12 months | security	1

Investment Securities - Non-mar

Investment Securities - Non-marketable Securities (Details)	12 Months Ended
	Dec. 31, 2015USD ($)$ / sharesshares	Feb. 18, 2016	Dec. 31, 2014USD ($)
Schedule of Cost-method Investments [Line Items]
Federal Home Loan Bank stock, par value | $ / shares	$ 100
Investments in low income housing tax credit funds	$ 2,700,000		$ 1,800,000
Low income housing tax credits and other tax benefits	225,000
Low income housing amortization expense	174,000
Unfunded commitments for low income housing tax credit funds	$ 1,700,000
Subsequent event
Schedule of Cost-method Investments [Line Items]
Federal Home Loan Bank, dividend rate percentage		7.99%
Visa Inc. Class B common stock
Schedule of Cost-method Investments [Line Items]
Number of shares of securities carried at cost | shares	16,939
Carrying value of securities carried at cost	$ 0
Fair value of Class B common stock	$ 2,200,000		1,800,000
Conversion ratio for common stock	1.6483
Other assets
Schedule of Cost-method Investments [Line Items]
Federal Home Loan Bank stock	$ 8,400,000		$ 8,200,000

Loans and Allowance for Loan 51

Loans and Allowance for Loan Losses - Loans Outstanding and Aging Analysis (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	$ 2,224	$ 10,359
Current	1,449,004	1,352,992
Total loans	$ 1,451,228	1,363,351
Non-accrual loans to total loans	217900000.00%
Purchased Credit Impaired (PCI) loans no longer accreting interest	$ 1	1,400
Purchased Credit-impaired (PCI) loans accreting interest	3,700	3,800
Deferred loan fees	768	487
Unaccreted purchase discounts on non-PCI loans	$ 3,200	$ 4,400
Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loans by class to all loans	66.00%
Commercial real estate loans | CALIFORNIA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loans by class and geographic location	83.00%
Real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loans by class to all loans	85.00%	87.00%
Unsecured loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loans by class to all loans	2.00%
Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	$ 1,382	$ 1,009
Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	722
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	120	9,350
Residential loans | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	732	926
Current	111,568	109,862
Total loans	$ 112,300	110,788
Non-accrual loans to total loans	17100000.00%
Residential loans | Other residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	$ 0	0
Current	73,154	73,035
Total loans	$ 73,154	73,035
Non-accrual loans to total loans	0.00%
Residential loans | Financing Receivables, 30 to 59 Days Past Due [Member] | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	$ 0	646
Residential loans | Financing Receivables, 30 to 59 Days Past Due [Member] | Other residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0	0
Residential loans | Financing Receivables, 60 to 89 Days Past Due [Member] | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	633
Residential loans | Financing Receivables, 60 to 89 Days Past Due [Member] | Other residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0
Residential loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	99	280
Residential loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Other residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0	0
Commercial loans | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	57	183
Current	219,395	210,040
Total loans	$ 219,452	210,223
Non-accrual loans to total loans	2100000.00%
Commercial loans | Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	$ 36	183
Commercial loans | Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0
Commercial loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	21	0
Commercial real estate loans | Commercial real estate, owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0	1,403
Current	242,309	229,202
Total loans	$ 242,309	230,605
Non-accrual loans to total loans	0.00%
Commercial real estate loans | Commercial real estate, investor
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	$ 1,096	2,429
Current	714,783	671,070
Total loans	$ 715,879	673,499
Non-accrual loans to total loans	190300000.00%
Commercial real estate loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	$ 1	5,134
Current	65,494	43,279
Total loans	$ 65,495	48,413
Non-accrual loans to total loans	100000.00%
Commercial real estate loans | Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate, owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	$ 0	0
Commercial real estate loans | Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate, investor
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	1,096	0
Commercial real estate loans | Financing Receivables, 30 to 59 Days Past Due [Member] | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	1	0
Commercial real estate loans | Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate, owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0
Commercial real estate loans | Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate, investor
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0
Commercial real estate loans | Financing Receivables, 60 to 89 Days Past Due [Member] | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0
Commercial real estate loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate, owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0	1,403
Commercial real estate loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate, investor
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0	2,429
Commercial real estate loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0	5,134
Consumer loans | Installment and other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	338	284
Current	22,301	16,504
Total loans	$ 22,639	16,788
Non-accrual loans to total loans	8300000.00%
Consumer loans | Financing Receivables, 30 to 59 Days Past Due [Member] | Installment and other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	$ 249	180
Consumer loans | Financing Receivables, 60 to 89 Days Past Due [Member] | Installment and other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	89
Consumer loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Installment and other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	$ 0	$ 104

Loans and Allowance for Loan 52

Loans and Allowance for Loan Losses - Credit Quality of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 1,451,228	$ 1,363,351
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,392,597	1,293,968
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	36,300	33,146
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	22,331	36,237
Commercial loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	219,277	209,899
Total loans	219,452	210,223
Commercial loans | Pass | Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	192,560	197,659
Commercial loans | Special Mention | Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	22,457	6,776
Commercial loans | Substandard | Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	4,260	5,464
Commercial real estate loans | Commercial real estate, owner-occupied
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	240,598	227,989
Total loans	242,309	230,605
Commercial real estate loans | Commercial real estate, investor
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	714,153	671,325
Total loans	715,879	673,499
Commercial real estate loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	65,494	48,402
Total loans	65,495	48,413
Commercial real estate loans | Pass | Commercial real estate, owner-occupied
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	219,060	205,820
Commercial real estate loans | Pass | Commercial real estate, investor
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	710,042	651,548
Commercial real estate loans | Pass | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	62,255	41,710
Commercial real estate loans | Special Mention | Commercial real estate, owner-occupied
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	12,371	10,406
Commercial real estate loans | Special Mention | Commercial real estate, investor
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	372	13,304
Commercial real estate loans | Special Mention | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	0	1,008
Commercial real estate loans | Substandard | Commercial real estate, owner-occupied
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	9,167	11,763
Commercial real estate loans | Substandard | Commercial real estate, investor
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	3,739	6,473
Commercial real estate loans | Substandard | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	3,239	5,684
Residential loans | Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	112,232	110,721
Total loans	112,300	110,788
Residential loans | Other residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	73,154	73,035
Residential loans | Pass | Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	109,959	107,933
Residential loans | Pass | Other residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	73,154	70,987
Residential loans | Special Mention | Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	1,100	322
Residential loans | Special Mention | Other residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Residential loans | Substandard | Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	1,173	2,466
Residential loans | Substandard | Other residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	2,048
Consumer loans | Installment and other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	22,639	16,788
Consumer loans | Pass | Installment and other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	22,307	16,101
Consumer loans | Special Mention | Installment and other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	190
Consumer loans | Substandard | Installment and other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	332	497
Receivables Acquired with Deteriorated Credit Quality
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	3,681	5,192
Receivables Acquired with Deteriorated Credit Quality | Pass
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	3,260	2,210
Receivables Acquired with Deteriorated Credit Quality | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	0	1,140
Receivables Acquired with Deteriorated Credit Quality | Substandard
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	421	1,842
Receivables Acquired with Deteriorated Credit Quality | Commercial loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	175	324
Receivables Acquired with Deteriorated Credit Quality | Commercial real estate loans | Commercial real estate, owner-occupied
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	1,711	2,616
Receivables Acquired with Deteriorated Credit Quality | Commercial real estate loans | Commercial real estate, investor
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	1,726	2,174
Receivables Acquired with Deteriorated Credit Quality | Commercial real estate loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	1	11
Receivables Acquired with Deteriorated Credit Quality | Residential loans | Home equity
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	68	67
Receivables Acquired with Deteriorated Credit Quality | Residential loans | Other residential
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	0	0
Receivables Acquired with Deteriorated Credit Quality | Consumer loans | Installment and other consumer
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	$ 0	$ 0

Loans and Allowance for Loan 53

Loans and Allowance for Loan Losses - Troubled Debt Restructuring by Class (Details)	1 Months Ended	12 Months Ended
	Jun. 30, 2015USD ($)loans	Dec. 31, 2015USD ($)loans	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans removed from TDR resignation | loans		5
Recorded investment of loans removed from TDR resignation		$ 1,600,000	$ 0
Recorded investment in Troubled Debt Restructurings		19,081,000	22,703,000
TDR loans accruing interest as of period end		19,000,000	15,900,000
Acquired loans included in TDR		137,000	1,800,000
Number of loans transferred to loans held-for-sale | loans	1
Charge-off on loan transferred to held-for-sale		864,000	277,000	$ 1,154,000
Gain (loss) on transfer of loans to held-for-sale	$ 0
Commercial | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment in Troubled Debt Restructurings		4,698,000	3,584,000
Charge-off on loan transferred to held-for-sale		5,000	66,000	672,000
Commercial real estate, owner-occupied | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment in Troubled Debt Restructurings		6,993,000	8,459,000
Charge-off on loan transferred to held-for-sale		0	0	0
Commercial real estate, investor | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment in Troubled Debt Restructurings		514,000	524,000
Charge-off on loan transferred to held-for-sale		0	0	156,000
Construction | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment in Troubled Debt Restructurings		3,238,000	5,684,000
Loans reclassified to held-for-sale	1,500,000
Charge-off on loan transferred to held-for-sale	$ 839,000	839,000	204,000	62,000
Home equity | Residential loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment in Troubled Debt Restructurings		460,000	694,000
Charge-off on loan transferred to held-for-sale		0	0	176,000
Other residential | Residential loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment in Troubled Debt Restructurings		2,010,000	2,045,000
Charge-off on loan transferred to held-for-sale		0	0	0
Installment and other consumer | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment in Troubled Debt Restructurings		1,168,000	1,713,000
Charge-off on loan transferred to held-for-sale		$ 20,000	$ 7,000	$ 88,000

Loans and Allowance for Loan 54

Loans and Allowance for Loan Losses - Troubled Debt Restructuring Modifications (Details)	12 Months Ended
	Dec. 31, 2015USD ($)contract	Dec. 31, 2014USD ($)contract	Dec. 31, 2013USD ($)contract
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	7	17	15
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 3,271,000	$ 6,734,000	$ 11,822,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	3,251,000	7,288,000	12,036,000
Post-Modification Outstanding Recorded Investment at period end	2,811,000	7,223,000	10,113,000
Total of TDR loans charged-off within previous 12 months	$ 0	$ 0	$ 0
Commercial | Commercial loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	7	6	8
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 3,271,000	$ 1,039,000	$ 1,176,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	3,251,000	1,258,000	1,377,000
Post-Modification Outstanding Recorded Investment at period end	$ 2,811,000	$ 1,251,000	$ 1,274,000
Commercial real estate, owner-occupied | Commercial real estate loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract		1
Financing Receivable, Modifications, Pre-Modification Recorded Investment		$ 4,226,000
Financing Receivable, Modifications, Post-Modification Recorded Investment		4,216,000
Post-Modification Outstanding Recorded Investment at period end		$ 4,175,000
Commercial real estate, investor | Commercial real estate loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract		2
Financing Receivable, Modifications, Pre-Modification Recorded Investment		$ 224,000
Financing Receivable, Modifications, Post-Modification Recorded Investment		224,000
Post-Modification Outstanding Recorded Investment at period end		$ 220,000
Construction | Commercial real estate loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract		2	1
Financing Receivable, Modifications, Pre-Modification Recorded Investment		$ 964,000	$ 2,961,000
Financing Receivable, Modifications, Post-Modification Recorded Investment		1,312,000	2,956,000
Post-Modification Outstanding Recorded Investment at period end		$ 1,309,000	$ 2,930,000
Home equity | Residential loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract			1
Financing Receivable, Modifications, Pre-Modification Recorded Investment			$ 539,000
Financing Receivable, Modifications, Post-Modification Recorded Investment			538,000
Post-Modification Outstanding Recorded Investment at period end			$ 534,000
Other residential | Residential loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract			3
Financing Receivable, Modifications, Pre-Modification Recorded Investment			$ 7,135,000
Financing Receivable, Modifications, Post-Modification Recorded Investment			7,156,000
Post-Modification Outstanding Recorded Investment at period end			$ 5,368,000
Installment and other consumer | Consumer loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract		6	2
Financing Receivable, Modifications, Pre-Modification Recorded Investment		$ 281,000	$ 11,000
Financing Receivable, Modifications, Post-Modification Recorded Investment		278,000	9,000
Post-Modification Outstanding Recorded Investment at period end		$ 268,000	$ 7,000

Loans and Allowance for Loan 55

Loans and Allowance for Loan Losses - Impaired Loans and Related Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Recorded investment in impaired loans:
With no specific allowance recorded	$ 12,928	$ 16,464
With a specific allowance recorded	8,260	8,759
Total recorded investment in impaired loans	21,188	25,223
Unpaid principal balance of impaired loans:
With no specific allowance recorded	14,920	22,677
With a specific allowance recorded	8,489	9,028
Total unpaid principal balance of impaired loans	23,409	31,705
Specific valuation	1,169	1,138
Average recorded investment in impaired loans during the period	23,273	25,909	$ 29,147
Interest income recognized on impaired loans	826	948	1,181
Charged-off portion of impaired loans	2,100	5,500
Outstanding commitments to extend credit on impaired loans	1,300	1,400
Commercial loans | Commercial
Recorded investment in impaired loans:
With no specific allowance recorded	2,198	1,141
With a specific allowance recorded	2,522	2,443
Total recorded investment in impaired loans	4,720	3,584
Unpaid principal balance of impaired loans:
With no specific allowance recorded	2,198	1,186
With a specific allowance recorded	2,565	2,524
Total unpaid principal balance of impaired loans	4,763	3,710
Specific valuation	912	694
Average recorded investment in impaired loans during the period	4,237	5,354	7,168
Interest income recognized on impaired loans	238	378	476
Commercial real estate loans | Commercial real estate, owner-occupied
Recorded investment in impaired loans:
With no specific allowance recorded	4,111	5,577
With a specific allowance recorded	2,882	2,882
Total recorded investment in impaired loans	6,993	8,459
Unpaid principal balance of impaired loans:
With no specific allowance recorded	4,111	6,577
With a specific allowance recorded	2,882	2,882
Total unpaid principal balance of impaired loans	6,993	9,459
Specific valuation	70	65
Average recorded investment in impaired loans during the period	7,886	6,604	3,519
Interest income recognized on impaired loans	295	288	253
Commercial real estate loans | Commercial real estate, investor
Recorded investment in impaired loans:
With no specific allowance recorded	2,416	2,954
With a specific allowance recorded	0	0
Total recorded investment in impaired loans	2,416	2,954
Unpaid principal balance of impaired loans:
With no specific allowance recorded	4,408	4,945
With a specific allowance recorded	0	0
Total unpaid principal balance of impaired loans	4,408	4,945
Specific valuation	0	0
Average recorded investment in impaired loans during the period	2,833	3,138	5,847
Interest income recognized on impaired loans	33	28	14
Commercial real estate loans | Construction
Recorded investment in impaired loans:
With no specific allowance recorded	2,687	5,134
With a specific allowance recorded	551	561
Total recorded investment in impaired loans	3,238	5,695
Unpaid principal balance of impaired loans:
With no specific allowance recorded	2,687	7,824
With a specific allowance recorded	737	749
Total unpaid principal balance of impaired loans	3,424	8,573
Specific valuation	1	3
Average recorded investment in impaired loans during the period	4,164	6,471	7,200
Interest income recognized on impaired loans	86	85	249
Residential loans | Home equity
Recorded investment in impaired loans:
With no specific allowance recorded	171	393
With a specific allowance recorded	388	300
Total recorded investment in impaired loans	559	693
Unpaid principal balance of impaired loans:
With no specific allowance recorded	171	880
With a specific allowance recorded	388	300
Total unpaid principal balance of impaired loans	559	1,180
Specific valuation	3	0
Average recorded investment in impaired loans during the period	602	741	909
Interest income recognized on impaired loans	18	19	29
Residential loans | Other residential
Recorded investment in impaired loans:
With no specific allowance recorded	1,214	1,026
With a specific allowance recorded	797	1,019
Total recorded investment in impaired loans	2,011	2,045
Unpaid principal balance of impaired loans:
With no specific allowance recorded	1,214	1,026
With a specific allowance recorded	797	1,019
Total unpaid principal balance of impaired loans	2,011	2,045
Specific valuation	67	92
Average recorded investment in impaired loans during the period	2,028	1,744	2,632
Interest income recognized on impaired loans	92	74	89
Consumer loans | Installment and other consumer
Recorded investment in impaired loans:
With no specific allowance recorded	131	239
With a specific allowance recorded	1,120	1,554
Total recorded investment in impaired loans	1,251	1,793
Unpaid principal balance of impaired loans:
With no specific allowance recorded	131	239
With a specific allowance recorded	1,120	1,554
Total unpaid principal balance of impaired loans	1,251	1,793
Specific valuation	116	284
Average recorded investment in impaired loans during the period	1,523	1,857	1,872
Interest income recognized on impaired loans	$ 64	$ 76	$ 71

Loans and Allowance for Loan 56

Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		$ 15,099	$ 14,224	$ 13,661
Provision (reversal)		500	750	540
Charge-offs		(864)	(277)	(1,154)
Recoveries		264	402	1,177
Ending balance		14,999	15,099	14,224
Ending ALLL related to loans collectively evaluated for impairment		13,830	13,961
Ending ALLL related to loans individually evaluated for impairment		1,160	1,131
Ending ALLL		14,999	15,099
Collectively evaluated for impairment		1,426,497	1,334,638
Individually evaluated for impairment		21,050	23,521
Total loans		$ 1,451,228	$ 1,363,351
Ratio of allowance for loan losses to total loans		1.03%	1.11%
Allowance for loan losses to non-accrual loans		688.00%	161.00%
PCI loans impaired post-acquisition		$ 138	$ 1,700
Receivables Acquired with Deteriorated Credit Quality
Allowance for Loan and Lease Losses [Roll Forward]
Ending ALLL		9	7
Purchased credit-impaired		3,681	5,192
Commercial loans | Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		2,837	3,056	4,100
Provision (reversal)		(45)	(321)	(1,393)
Charge-offs		(5)	(66)	(672)
Recoveries		236	168	1,021
Ending balance		3,023	2,837	3,056
Ending ALLL related to loans collectively evaluated for impairment		2,111	2,143
Ending ALLL related to loans individually evaluated for impairment		904	690
Ending ALLL		3,023	2,837
Collectively evaluated for impairment		214,695	206,603
Individually evaluated for impairment		4,582	3,296
Total loans		$ 219,452	$ 210,223
Ratio of allowance for loan losses to total loans		1.38%	1.35%
Allowance for loan losses to non-accrual loans		14395.00%
Commercial loans | Commercial | Receivables Acquired with Deteriorated Credit Quality
Allowance for Loan and Lease Losses [Roll Forward]
Ending ALLL		$ 8	$ 4
Purchased credit-impaired		175	324
Commercial real estate loans | Commercial real estate, owner-occupied
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		1,924	2,012	1,313
Provision (reversal)		325	(93)	615
Charge-offs		0	0	0
Recoveries		0	5	84
Ending balance		2,249	1,924	2,012
Ending ALLL related to loans collectively evaluated for impairment		2,179	1,859
Ending ALLL related to loans individually evaluated for impairment		70	65
Ending ALLL		2,249	1,924
Collectively evaluated for impairment		233,605	220,933
Individually evaluated for impairment		6,993	7,056
Total loans		$ 242,309	$ 230,605
Ratio of allowance for loan losses to total loans		0.93%	0.83%
Allowance for loan losses to non-accrual loans			137.00%
Commercial real estate loans | Commercial real estate, owner-occupied | Receivables Acquired with Deteriorated Credit Quality
Allowance for Loan and Lease Losses [Roll Forward]
Ending ALLL		$ 0	$ 0
Purchased credit-impaired		1,711	2,616
Commercial real estate loans | Commercial real estate, investor
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		6,672	6,196	4,372
Provision (reversal)		(517)	431	1,940
Charge-offs		0	0	(156)
Recoveries		23	45	40
Ending balance		6,178	6,672	6,196
Ending ALLL related to loans collectively evaluated for impairment		6,178	6,672
Ending ALLL related to loans individually evaluated for impairment		0	0
Ending ALLL		6,178	6,672
Collectively evaluated for impairment		711,737	668,371
Individually evaluated for impairment		2,416	2,954
Total loans		$ 715,879	$ 673,499
Ratio of allowance for loan losses to total loans		0.86%	0.99%
Allowance for loan losses to non-accrual loans		325.00%	275.00%
Commercial real estate loans | Commercial real estate, investor | Receivables Acquired with Deteriorated Credit Quality
Allowance for Loan and Lease Losses [Roll Forward]
Ending ALLL		$ 0	$ 0
Purchased credit-impaired		1,726	2,174
Commercial real estate loans | Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		839	633	611
Provision (reversal)		724	314	83
Charge-offs	$ (839)	(839)	(204)	(62)
Recoveries		0	96	1
Ending balance		724	839	633
Ending ALLL related to loans collectively evaluated for impairment		723	836
Ending ALLL related to loans individually evaluated for impairment		0	0
Ending ALLL		724	839
Collectively evaluated for impairment		62,256	42,718
Individually evaluated for impairment		3,238	5,684
Total loans		$ 65,495	$ 48,413
Ratio of allowance for loan losses to total loans		1.11%	1.73%
Allowance for loan losses to non-accrual loans		72400.00%	16.00%
Commercial real estate loans | Construction | Receivables Acquired with Deteriorated Credit Quality
Allowance for Loan and Lease Losses [Roll Forward]
Ending ALLL		$ 1	$ 3
Purchased credit-impaired		1	11
Residential loans | Home equity
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		859	875	1,264
Provision (reversal)		48	(19)	(223)
Charge-offs		0	0	(176)
Recoveries		3	3	10
Ending balance		910	859	875
Ending ALLL related to loans collectively evaluated for impairment		907	859
Ending ALLL related to loans individually evaluated for impairment		3	0
Ending ALLL		910	859
Collectively evaluated for impairment		111,673	110,028
Individually evaluated for impairment		559	693
Total loans		$ 112,300	$ 110,788
Ratio of allowance for loan losses to total loans		0.81%	0.78%
Allowance for loan losses to non-accrual loans		532.00%	307.00%
Residential loans | Home equity | Receivables Acquired with Deteriorated Credit Quality
Allowance for Loan and Lease Losses [Roll Forward]
Ending ALLL		$ 0	$ 0
Purchased credit-impaired		68	67
Residential loans | Other residential
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		433	317	551
Provision (reversal)		(39)	116	(234)
Charge-offs		0	0	0
Recoveries		0	0	0
Ending balance		394	433	317
Ending ALLL related to loans collectively evaluated for impairment		327	341
Ending ALLL related to loans individually evaluated for impairment		67	92
Ending ALLL		394	433
Collectively evaluated for impairment		71,143	70,990
Individually evaluated for impairment		2,011	2,045
Total loans		$ 73,154	$ 73,035
Ratio of allowance for loan losses to total loans		0.54%	0.59%
Residential loans | Other residential | Receivables Acquired with Deteriorated Credit Quality
Allowance for Loan and Lease Losses [Roll Forward]
Ending ALLL		$ 0	$ 0
Purchased credit-impaired		0	0
Consumer loans | Installment and other consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		566	629	1,231
Provision (reversal)		(123)	(141)	(535)
Charge-offs		(20)	(7)	(88)
Recoveries		2	85	21
Ending balance		425	566	629
Ending ALLL related to loans collectively evaluated for impairment		309	282
Ending ALLL related to loans individually evaluated for impairment		116	284
Ending ALLL		425	566
Collectively evaluated for impairment		21,388	14,995
Individually evaluated for impairment		1,251	1,793
Total loans		$ 22,639	$ 16,788
Ratio of allowance for loan losses to total loans		1.88%	3.37%
Allowance for loan losses to non-accrual loans		512.00%	544.00%
Consumer loans | Installment and other consumer | Receivables Acquired with Deteriorated Credit Quality
Allowance for Loan and Lease Losses [Roll Forward]
Ending ALLL		$ 0	$ 0
Purchased credit-impaired		0	0
Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		969	506	219
Provision (reversal)		127	463	287
Charge-offs		0	0	0
Recoveries		0	0	0
Ending balance		1,096	969	$ 506
Ending ALLL related to loans collectively evaluated for impairment		1,096	969
Ending ALLL related to loans individually evaluated for impairment		0	0
Ending ALLL		1,096	969
Collectively evaluated for impairment		0	0
Individually evaluated for impairment		0	0
Total loans		0	0
Unallocated | Receivables Acquired with Deteriorated Credit Quality
Allowance for Loan and Lease Losses [Roll Forward]
Ending ALLL		0	0
Purchased credit-impaired		$ 0	$ 0

Loans and Allowance for Loan 57

Loans and Allowance for Loan Losses - Purchased Credit-Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Nov. 29, 2013
PCI Loans, Fair Value [Abstract]
Contractually required payments including interest, Purchased credit-impaired loans				$ 5,706
Contractually required payments including interest, Other purchased loans				211,769
Contractually required payments including interest, Total				217,475
Less: nonaccretable difference, Purchased credit-impaired loans				(1,183)
Less: nonaccretable difference, Other purchased loans				0
Less: nonaccretable difference, Total				(1,183)
Cash flows expected to be collected (undiscounted), Purchased credit-impaired loans				4,523
Cash flows expected to be collected (undiscounted), Other purchased loans				211,769
Cash flows expected to be collected (undiscounted), Total				216,292
Accretable yield, Purchased credit-impaired loans				(707)
Accretable Yield, Other Purchased Loans				(41,826)
Accretable Yield, Total				(42,533)
Fair value of purchased credit-impaired loans				3,816
Fair value of other purchased loans				169,943
Fair value of purchased loans				173,759
Increase of specific allowance for PCI loan losses	$ 4	$ 3	$ 203
PCI Loans, Carrying Value [Abstract]
Unpaid principal balance	4,977	7,678		4,993
Carrying value	3,681	5,192		3,816
Accretable Yield [Roll Forward]
Balance at beginning of period	4,027	3,649	3,960
Additions	0	0	707
Removals	(914)	(273)	(793)
Accretion	(495)	(613)	(725)
Reclassifications (to)/from nonaccretable difference	0	1,264	500
Balance at end of period	2,618	4,027	3,649
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses, Decreases	2	238	$ 237
Other purchased loans
PCI Loans, Fair Value [Abstract]
Difference between the contractual principal amounts due and the fair value				6,600
Contractual interest to be earned over the life of the loans				35,200
Residential loans | Home equity
PCI Loans, Carrying Value [Abstract]
Unpaid principal balance	224	232		239
Carrying value	68	67		69
Commercial loans | Commercial
PCI Loans, Carrying Value [Abstract]
Unpaid principal balance	237	479		847
Carrying value	175	324		369
Commercial real estate loans
PCI Loans, Carrying Value [Abstract]
Unpaid principal balance	4,329	6,831		3,757
Carrying value	3,437	4,790		3,362
Commercial real estate loans | Construction
PCI Loans, Carrying Value [Abstract]
Unpaid principal balance	187	136		150
Carrying value	$ 1	$ 11		$ 16

Loans and Allowance for Loan 58

Loans and Allowance for Loan Losses - Pledged Loans (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Financial Instruments Owned and Pledged as Collateral [Line Items]
Certain qualifying loans pledged for FHLB line of credit	$ 833.8	$ 868.1
Other residential
Financial Instruments Owned and Pledged as Collateral [Line Items]
Residential loans pledged for FRB borrowings	$ 45.2	$ 27.7

Loans and Allowance for Loan 59

Loans and Allowance for Loan Losses - Related Party Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Receivables [Abstract]
Balance at beginning of year	$ 3,329	$ 3,749	$ 3,425
Additions	0	0	550
Advances	165	0	569
Repayments	(390)	(420)	0
Reclassified as unrelated-party loan due to a change in borrower status	(542)	0	(795)
Balance at end of year	2,562	$ 3,329	$ 3,749
Undisbursed commitment to related parties	$ 1,000

Bank Premises and Equipment (De

Bank Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Bank premises and equipment, Gross	$ 23,502	$ 22,906
Accumulated depreciation and amortization	(14,197)	(13,047)
Bank premises and equipment, net	9,305	9,859
Depreciation and amortization	2,000	1,600	$ 1,400
Leasehold improvements
Property, Plant and Equipment [Line Items]
Bank premises and equipment, Gross	13,615	13,866
Furniture and equipment
Property, Plant and Equipment [Line Items]
Bank premises and equipment, Gross	$ 9,887	$ 9,040

Bank Owned Life Insurance (Deta

Bank Owned Life Insurance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Insurance [Abstract]
Estimated death benefits	$ 64,100
Death benefits provided under terms of the programs	29,500	$ 28,600
Earnings on bank-owned life insurance	$ 814	$ 841	$ 954
Bank owned life insurance benefit realized			$ 228

Deposits - Stratification of Ti

Deposits - Stratification of Time Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Banking and Thrift [Abstract]
Time deposits of less than $100 thousand	$ 39,534	$ 44,130
Time deposits of $100 thousand to $250 thousand	67,352	58,240
Time deposits of more than $250 thousand	54,571	47,344
Time accounts	$ 161,457	$ 149,714

Deposits - Narrative (Details)

Deposits - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Banking and Thrift [Abstract]
Interest on time accounts	$ 853,000	$ 917,000	$ 922,000
Held-to-maturity securities pledged as collateral	50,900,000
Available-for-sale securities pledged as collateral	36,200,000
Certificate Of Deposit Account Registry Service (CDARS) in time deposits	14,300,000
Insured Cash Sweep (ICS) in money market accounts	12,200,000
Amount placed in CDARS deposits	355,000	18,300,000
Amount of matching deposits on CDARS placed	0	0
Deposit overdrafts reclassified as loan balances	84,000	380,000
Related party deposit liabilities	$ 8,300,000	$ 8,800,000

Deposits - Time Deposit Maturit

Deposits - Time Deposit Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Maturities of Time Deposits [Abstract]
2,016	$ 113,232
2,017	23,482
2,018	9,317
2,019	7,482
2,020	7,944
Thereafter	0
Time accounts	$ 161,457	$ 149,714

Borrowings - Lines of Credit an

Borrowings - Lines of Credit and Borrowing Agreements (Details) - USD ($)	Feb. 05, 2008	Dec. 31, 2015	Dec. 31, 2014
Line of Credit | Federal Home Loan Bank Borrowings
Line of Credit Facility [Line Items]
Amount of FHLB borrowings outstanding		$ 15,000,000	$ 15,000,000
Term of FHLB borrowing agreements	10 years
Principal amount of borrowing agreements with FHLB	$ 15,000,000
Fixed interest rate of FHLB borrowing agreement	2.07%
Line of Credit | Federal Home Loan Bank
Line of Credit Facility [Line Items]
Lines of credit		470,600,000	450,600,000
Remaining available line of credit from FHLB		$ 403,400,000	435,300,000
Periodic term interest-only payments are due		3 months
Periodic term lender may accelerate due date		3 months
Letters of credit | Federal Home Loan Bank Borrowings
Line of Credit Facility [Line Items]
Amount of FHLB borrowings outstanding		$ 241,000
Federal Funds Purchased | Line of Credit
Line of Credit Facility [Line Items]
Lines of credit		92,000,000	72,000,000
Short-term Debt		0	0
Federal Home Loan Bank Borrowings | Line of Credit
Line of Credit Facility [Line Items]
Short-term Debt		$ 52,000,000	0
Fixed interest rate of FHLB borrowing agreement		0.27%
Federal Reserve Line of Credit | Line of Credit
Line of Credit Facility [Line Items]
Lines of credit		$ 37,800,000	27,700,000
Short-term Debt			0
Amount of FHLB borrowings outstanding		$ 0	$ 0

Borrowings - Subordinated Debt

Borrowings - Subordinated Debt (Details) $ in Thousands	Nov. 29, 2013USD ($)debenture	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Debt Instrument [Line Items]
Subordinated debentures		$ 5,395	$ 5,185
Number of subordinated debentures acquired | debenture	2
Accretion of discount on subordinated debentures		210	216	$ 19
Amount guaranteed, on subordinated basis, distributions and other payments on trust preferred securities		8,000
Subordinated debenture
Debt Instrument [Line Items]
Subordinated debentures		5,395	5,185
Subordinated debenture	$ 4,950
Long-term Debt, Gross	$ 8,200	8,248
Accretion of discount on subordinated debentures		$ 210	$ 216	$ 19
Subordinated debenture | NorCal Community Bancorp Trust I
Debt Instrument [Line Items]
Basis spread on subordinated debenture		3.05%
Long-term Debt, Gross		$ 4,124
Effective interest rate		3.37%
Subordinated debenture | NorCal Community Bancorp Trust II
Debt Instrument [Line Items]
Basis spread on subordinated debenture		1.40%
Long-term Debt, Gross		$ 4,124
Effective interest rate		1.91%
Subordinated debenture | Maximum
Debt Instrument [Line Items]
Debenture distribution deferral period	5 years

Borrowings - Schedule of Borrow

Borrowings - Schedule of Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Subordinated debenture, Carrying Value	$ 5,395	$ 5,185
Subordinated debenture
Debt Instrument [Line Items]
Subordinated debenture, Carrying Value	5,395	5,185
Subordinated debenture, Average Balance	$ 5,288	$ 5,070
Borrowings, Average Rate	7.94%	8.36%
Line of Credit | Federal Home Loan Bank Borrowings
Debt Instrument [Line Items]
FHLB overnight borrowings and advances, Carrying Value	$ 15,000	$ 15,000
FHLB overnight borrowings and advances, Average Balance	$ 15,000	$ 15,000
Borrowings, Average Rate	2.07%	2.07%
Federal Home Loan Bank Borrowings | Line of Credit
Debt Instrument [Line Items]
Short-term Debt	$ 52,000	$ 0
FHLB overnight borrowings and advances, Average Balance	$ 784	$ 4
Borrowings, Average Rate	0.38%	0.00%

Stockholders' Equity and Stoc68

Stockholders' Equity and Stock Plans - Narrative (Details) $ / shares in Units, $ in Thousands	1 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2015$ / sharesshares	Nov. 30, 2011investor	Sep. 30, 2015$ / sharesshares	Dec. 31, 2015USD ($)$ / sharesshares	Dec. 31, 2014USD ($)$ / sharesshares	Dec. 31, 2013USD ($)shares	Dec. 31, 2005	May. 11, 2010shares	Jul. 01, 2007shares	May. 08, 2007shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of institutional investors that purchased warrant | investor		2
Unrecognized compensation expense | $				$ 1,500
Weighted average period unrecognized compensation expense will be recognized				2 years 3 months 18 days
Total compensation cost for share-based payment arrangements | $				$ 636	$ 446	$ 403
Share-based compensation income tax benefit recognized | $				194	128	109
Tax benefit realized from disqualifying dispositions of incentive stock options | $				$ 49	$ 76	$ 94
Preferred stock, authorized (in shares)				5,000,000	5,000,000
Preferred stock, no par value (in dollars per share) | $ / shares				$ 0	$ 0
Director Stock Plan, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares approved to be issued in each plan								150,000
Number of shares available for future grants under plan				118,965
Equity Plan, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares approved to be issued in each plan										500,000
Number of shares available for future grants under plan				205,297
Number of shares to be granted				250,000
Employee Stock Purchase Plan, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares approved to be issued in each plan									200,000
Number of shares available for future grants under plan				193,586
Discount from closing market price at end of each quarter				5.00%
Former 1999 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted				0
Nonemployee Director | Vesting Rate, Year Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Nonemployee Director | Vesting Rate, Year Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Nonemployee Director | Vesting Rate Year Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock shares authorized to be purchased by warrant	157,711		157,711
Exercise price of warrant to purchase common stock | $ / shares	$ 26.63		$ 26.63
Net issuance of shares of common stock from cashless exercise (in shares)	70,591
Common Stock | Director Stock Plan, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded in period from plan				5,295	5,306	5,619
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant-date fair value of option shares vested | $				$ 202	$ 182	$ 187
Stock options | Officer and Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period of grants				10 years
Stock options | Nonemployee Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period							4 years
Expiration period of grants				7 years
Stock options | Nonemployee Director | Immediately Upon Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Stock options | Nonemployee Director | Vesting Rate, Year One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Restricted stock award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant-date fair value of option shares vested | $				$ 262	$ 227	$ 218
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Prior to January 1, 2006 | Stock options | Officer and Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period							4 years
Prior to January 1, 2006 | Stock options | Officer and Employee | Immediately Upon Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage							20.00%
Prior to January 1, 2006 | Stock options | Officer and Employee | Vesting Rate, Year One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage							20.00%
Prior to January 1, 2006 | Stock options | Officer and Employee | Vesting Rate, Year Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage							20.00%
Prior to January 1, 2006 | Stock options | Officer and Employee | Vesting Rate, Year Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage							20.00%
Prior to January 1, 2006 | Stock options | Officer and Employee | Vesting Rate Year Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage							20.00%
Subsequent to January 1, 2006 | Stock options | Vesting Rate, Year One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					20.00%
Subsequent to January 1, 2006 | Stock options | Vesting Rate, Year Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					20.00%
Subsequent to January 1, 2006 | Stock options | Vesting Rate, Year Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					20.00%
Subsequent to January 1, 2006 | Stock options | Vesting Rate Year Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					20.00%
Subsequent to January 1, 2006 | Stock options | Vesting Rate Year Five
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					20.00%
Subsequent to January 1, 2006 | Restricted stock award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					5 years
Subsequent to January 1, 2006 | Restricted stock award | Vesting Rate, Year One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					20.00%
Subsequent to January 1, 2006 | Restricted stock award | Vesting Rate, Year Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					20.00%
Subsequent to January 1, 2006 | Restricted stock award | Vesting Rate, Year Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					20.00%
Subsequent to January 1, 2006 | Restricted stock award | Vesting Rate Year Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					20.00%
Subsequent to January 1, 2006 | Restricted stock award | Vesting Rate Year Five
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					20.00%
Subsequent To January 1, 2015 | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				33000.00%
Subsequent To January 1, 2015 | Stock options | Vesting Rate, Year One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period							3 years
Subsequent To January 1, 2015 | Restricted stock award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				33.00%
Award vesting period							3 years
Minimum | Employee Stock Purchase Plan, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Approved payroll deduction to purchase shares, percentage				1.00%
Minimum | Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			0.00%
Maximum | Employee Stock Purchase Plan, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Approved payroll deduction to purchase shares, percentage				15.00%
Maximum | Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			200.00%
U.S. Treasury Capital Purchase Program (TCPP) | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock shares authorized to be purchased by warrant				154,242
Exercise price of warrant to purchase common stock | $ / shares				$ 27.23

Stockholders' Equity and Stoc69

Stockholders' Equity and Stock Plans - Options Outstanding Rollforward (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Number of Shares
Options outstanding, beginning balance	194,672	220,456	285,533
Granted	28,320	26,421	30,000
Cancelled, expired or forfeited	(652)	(2,790)	(23,840)
Exercised	(37,071)	(49,415)	(71,237)
Options outstanding, ending balance	185,269	194,672	220,456	285,533
Exercisable (vested), ending balance	114,581	133,153	163,301
Weighted Average Exercise Price
Options outstanding, beginning balance	$ 35.14	$ 32.74	$ 31.73
Granted	50.70	44.83	39.99
Cancelled, expired or forfeited	48.38	39.01	35.12
Exercised	30.72	29.39	31.13
Options outstanding, ending balance	38.35	35.14	32.74	$ 31.73
Exercisable (vested), ending balance	$ 34.12	$ 32.31	$ 31.09
Aggregate Intrinsic Value
Options outstanding, beginning balance	$ 3,398	$ 2,349	$ 1,661
Exercised	755	771	664
Options outstanding, ending balance	2,788	3,398	2,349	$ 1,661
Exercisable (vested) at year end	$ 2,209	$ 2,701	$ 2,008
Weighted Average Grant-Date Fair Value
Granted	$ 12.21	$ 12.04	$ 10.59
Weighted Average Remaining Contractual Term
Options outstanding	5 years	4 years 5 months 22 days	4 years 18 days	4 years 5 months 5 days
Exercisable (vested)	3 years 2 months 16 days	2 years 10 months 16 days	2 years 6 months 21 days

Stockholders' Equity and Stoc70

Stockholders' Equity and Stock Plans - Options Outstanding, Vested and Expected to Vest (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)$ / sharesshares
Equity [Abstract]
Number of options | shares	179,883
Weighted average exercise price | $ / shares	$ 38.14
Aggregate intrinsic value (in thousands) | $	$ 2,745
Weighted average remaining contractual term (in years)	4 years 10 months 28 days

Stockholders' Equity and Stoc71

Stockholders' Equity and Stock Plans - Non-vested Awards Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Number of Shares
Non-vested awards, beginning balance	22,423	22,521	21,610
Granted	15,970	8,523	11,850
Vested	(6,555)	(6,554)	(6,941)
Forfeited	(450)	(2,067)	(3,998)
Non-vested awards, ending balance	31,388	22,423	22,521
Weighted Average Grant-Date Fair Value
Non-vested awards, beginning balance	$ 41.25	$ 37.59	$ 34.05
Granted	50.75	45.36	39.96
Vested	40	34.65	31.42
Forfeited	48.45	39.32	36.19
Non-vested awards, ending balance	$ 46.24	$ 41.25	$ 37.59

Stockholders' Equity and Stoc72

Stockholders' Equity and Stock Plans - Options Outstanding by Price Range (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options Outstanding	185,269	194,672	220,456	285,533
Stock Options Outstanding, Remaining Contractual Life (in years)	5 years	4 years 5 months 22 days	4 years 18 days	4 years 5 months 5 days
Stock Options Outstanding, Weighted Average Exercise Price	$ 38.35	$ 35.14	$ 32.74	$ 31.73
$20.01 - $25.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Limit	20.01
Range of Exercise Prices, Upper Limit	25
$25.01 - $30.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Limit	25.01
Range of Exercise Prices, Upper Limit	30
$30.01 - $35.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Limit	30.01
Range of Exercise Prices, Upper Limit	35
$35.01 - $40.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Limit	35.01
Range of Exercise Prices, Upper Limit	40
$40.01 - $45.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Limit	40.01
Range of Exercise Prices, Upper Limit	45
$45.01 - $50.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Limit	45.01
Range of Exercise Prices, Upper Limit	50
$45.01 - $50.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Limit	45.01
Range of Exercise Prices, Upper Limit	$ 50
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options Outstanding	185,269
Stock Options Outstanding, Remaining Contractual Life (in years)	5 years
Stock Options Outstanding, Weighted Average Exercise Price	$ 38.35
Stock Options Exercisable	114,581
Stock Options Exercisable, Weighted Average Exercise Price	$ 34.12
Stock options | $20.01 - $25.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options Outstanding	13,138
Stock Options Outstanding, Remaining Contractual Life (in years)	3 years 3 months 18 days
Stock Options Outstanding, Weighted Average Exercise Price	$ 22.25
Stock Options Exercisable	13,138
Stock Options Exercisable, Weighted Average Exercise Price	$ 22.25
Stock options | $25.01 - $30.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options Outstanding	10,180
Stock Options Outstanding, Remaining Contractual Life (in years)	2 years 3 months 18 days
Stock Options Outstanding, Weighted Average Exercise Price	$ 28.75
Stock Options Exercisable	10,180
Stock Options Exercisable, Weighted Average Exercise Price	$ 28.75
Stock options | $30.01 - $35.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options Outstanding	41,270
Stock Options Outstanding, Remaining Contractual Life (in years)	1 year 3 months 18 days
Stock Options Outstanding, Weighted Average Exercise Price	$ 33.67
Stock Options Exercisable	41,270
Stock Options Exercisable, Weighted Average Exercise Price	$ 33.67
Stock options | $35.01 - $40.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options Outstanding	50,630
Stock Options Outstanding, Remaining Contractual Life (in years)	4 years 9 months 18 days
Stock Options Outstanding, Weighted Average Exercise Price	$ 37.50
Stock Options Exercisable	35,663
Stock Options Exercisable, Weighted Average Exercise Price	$ 37.02
Stock options | $40.01 - $45.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options Outstanding	29,551
Stock Options Outstanding, Remaining Contractual Life (in years)	6 years 10 months 24 days
Stock Options Outstanding, Weighted Average Exercise Price	$ 41.95
Stock Options Exercisable	11,220
Stock Options Exercisable, Weighted Average Exercise Price	$ 41.89
Stock options | $45.01 - $50.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options Outstanding	12,550
Stock Options Outstanding, Remaining Contractual Life (in years)	8 years 3 months 18 days
Stock Options Outstanding, Weighted Average Exercise Price	$ 45.88
Stock Options Exercisable	2,510
Stock Options Exercisable, Weighted Average Exercise Price	$ 45.88
Stock options | $45.01 - $50.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options Outstanding	27,950
Stock Options Outstanding, Remaining Contractual Life (in years)	9 years 2 months 12 days
Stock Options Outstanding, Weighted Average Exercise Price	$ 50.70
Stock Options Exercisable	600
Stock Options Exercisable, Weighted Average Exercise Price	$ 50.27

Stockholders' Equity and Stoc73

Stockholders' Equity and Stock Plans - Valuation Assumptions (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	1.67%	2.04%	1.60%
Expected dividend yield on common stock	1.75%	1.70%	1.80%
Expected life in years	6 years	6 years	6 years 9 months 17 days
Expected price volatility	28.06%	30.32%	30.01%

Stockholders' Equity and Stoc74

Stockholders' Equity and Stock Plans - Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Equity [Abstract]
Cash dividends to common stockholders	$ 5,390	$ 4,733	$ 3,970
Cash dividends paid per common share	$ 0.90	$ 0.80	$ 0.73
Retained earnings	$ 129,553	$ 116,502
Stockholders' equity	$ 214,473	$ 200,026	$ 180,887	$ 151,792
Period used to determine amount available for payment of dividends based on restriction	3 years
Amount of retained earnings available for payment of dividends based on restriction	$ 20,500
Cash held	$ 3,800

Fair Value of Assets and Liab75

Fair Value of Assets and Liabilities - Recorded on a Recurring Basis (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)security	Dec. 31, 2014USD ($)security
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale, Fair Value	$ 417,787	$ 200,848
Derivative financial assets (interest rate contracts)	3	61
Derivative financial liabilities (interest rate contracts)	$ 1,658	$ 1,996
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of securities | security	0	0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of securities | security	1
Assets and liabilities at fair value measured on a recurring basis | Carrying Value | Interest rate contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial assets (interest rate contracts)	$ 3	$ 61
Derivative financial liabilities (interest rate contracts)	1,658	1,996
Assets and liabilities at fair value measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial assets (interest rate contracts)	0	0
Derivative financial liabilities (interest rate contracts)	0	0
Assets and liabilities at fair value measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Interest rate contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial assets (interest rate contracts)	3	61
Derivative financial liabilities (interest rate contracts)	1,658	1,996
Assets and liabilities at fair value measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Interest rate contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial assets (interest rate contracts)	0	0
Derivative financial liabilities (interest rate contracts)	0	0
MBS pass-through securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale, Fair Value	138,462	94,214
Decrease in unrealized gain due to transfers to Level 3	7
MBS pass-through securities | Assets and liabilities at fair value measured on a recurring basis | Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale, Fair Value	190,093	158,119
MBS pass-through securities | Assets and liabilities at fair value measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale, Fair Value	0	0
MBS pass-through securities | Assets and liabilities at fair value measured on a recurring basis | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale, Fair Value	188,381	155,421
MBS pass-through securities | Assets and liabilities at fair value measured on a recurring basis | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale, Fair Value	1,712	2,698
Debentures of government sponsored agencies | Assets and liabilities at fair value measured on a recurring basis | Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale, Fair Value	160,892	14,557
Debentures of government sponsored agencies | Assets and liabilities at fair value measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale, Fair Value	0	0
Debentures of government sponsored agencies | Assets and liabilities at fair value measured on a recurring basis | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale, Fair Value	160,892	14,557
Debentures of government sponsored agencies | Assets and liabilities at fair value measured on a recurring basis | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale, Fair Value	0	0
Privately-issued CMOs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale, Fair Value	4,150	7,294
Privately-issued CMOs | Assets and liabilities at fair value measured on a recurring basis | Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale, Fair Value	4,150	7,294
Privately-issued CMOs | Assets and liabilities at fair value measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale, Fair Value	0	0
Privately-issued CMOs | Assets and liabilities at fair value measured on a recurring basis | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale, Fair Value	4,150	7,294
Privately-issued CMOs | Assets and liabilities at fair value measured on a recurring basis | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale, Fair Value	0	0
Obligations of state and political subdivisions | Assets and liabilities at fair value measured on a recurring basis | Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale, Fair Value	57,673	15,880
Obligations of state and political subdivisions | Assets and liabilities at fair value measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale, Fair Value	0	0
Obligations of state and political subdivisions | Assets and liabilities at fair value measured on a recurring basis | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale, Fair Value	57,673	15,771
Obligations of state and political subdivisions | Assets and liabilities at fair value measured on a recurring basis | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale, Fair Value	0	0
Corporate bonds | Assets and liabilities at fair value measured on a recurring basis | Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale, Fair Value	4,979	4,998
Corporate bonds | Assets and liabilities at fair value measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale, Fair Value	0	0
Corporate bonds | Assets and liabilities at fair value measured on a recurring basis | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale, Fair Value	4,979	5,437
Corporate bonds | Assets and liabilities at fair value measured on a recurring basis | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale, Fair Value	$ 0	$ 0

Fair Value of Assets and Liab76

Fair Value of Assets and Liabilities - Recorded on Nonrecurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans carried at fair value, carrying value	$ 21,188	$ 25,223
Specific valuation allowance for impaired loans	$ 1,169	1,138
Discount rate for selling costs applied to all properties	6.00%
Change in estimated fair value of OREO as of acquisition date	$ 40
Financial instruments at fair value measured on a nonrecurring basis | Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real Estate Acquired Through Foreclosure	421	461
Financial instruments at fair value measured on a nonrecurring basis | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real Estate Acquired Through Foreclosure	421	461
Financial instruments at fair value measured on a nonrecurring basis | Fair Value Hierarcy (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real Estate Acquired Through Foreclosure	0	0
Financial instruments at fair value measured on a nonrecurring basis | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real Estate Acquired Through Foreclosure	0	0
Consumer loans | Consumer loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans carried at fair value, carrying value		77
Specific valuation allowance for impaired loans		26
Consumer loans | Financial instruments at fair value measured on a nonrecurring basis | Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans carried at fair value, carrying value		77
Consumer loans | Financial instruments at fair value measured on a nonrecurring basis | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans carried at fair value, carrying value		77
Consumer loans | Financial instruments at fair value measured on a nonrecurring basis | Fair Value Hierarcy (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans carried at fair value, carrying value		0
Consumer loans | Financial instruments at fair value measured on a nonrecurring basis | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans carried at fair value, carrying value		0
Consumer loans | Installment and other consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans carried at fair value, carrying value	1,251	1,793
Specific valuation allowance for impaired loans	$ 116	$ 284

Fair Value of Assets and Liab77

Fair Value of Assets and Liabilities - Fair Value of Financial Instruments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Nov. 29, 2013USD ($)debenture
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investment securities held to maturity	$ 71,054	$ 118,643
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Number of subordinated debentures acquired | debenture			2
Subordinated debenture
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Subordinated debentures			$ 4,950
Subordinated debenture | NorCal Community Bancorp Trust I
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Basis spread on subordinated debenture	3.05%
Subordinated debenture | NorCal Community Bancorp Trust II
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Basis spread on subordinated debenture	1.40%
Fair Value Hierarcy (Level 1) | Carrying Value
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and cash equivalents	$ 26,343	41,367
Fair Value Hierarcy (Level 1) | Fair Value
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and cash equivalents	26,343	41,367
Fair Value Hierarchy (Level 2) | Carrying Value
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investment securities held to maturity	69,637	116,437
Interest receivable	6,643	5,909
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Deposits	1,728,226	1,551,619
Federal Home Loan Bank borrowing	67,000	15,000
Interest payable	187	213
Fair Value Hierarchy (Level 2) | Fair Value
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investment securities held to maturity	71,054	118,643
Interest receivable	6,643	5,909
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Deposits	1,728,717	1,552,446
Federal Home Loan Bank borrowing	67,279	15,484
Interest payable	187	213
Fair Value Hierarchy (Level 3) | Carrying Value
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans, net	1,436,229	1,348,252
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Subordinated debentures	5,395	5,185
Fair Value Hierarchy (Level 3) | Fair Value
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans, net	1,470,380	1,361,244
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Subordinated debentures	$ 5,132	$ 5,290

Benefit Plans - Deferred Compen

Benefit Plans - Deferred Compensation Plan (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Interest rate earned on deferred amounts, prime rate first business day of year		3.25%	3.25%	3.25%
Deferred compensation obligation		$ 3	$ 2.9
Subsequent event
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Interest rate earned on deferred amounts, prime rate first business day of year	3.50%
Annual Salary | Management
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Maximum percentage of compensation allowed to be deferred		80.00%
Deferred Bonus | Management
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Maximum percentage of compensation allowed to be deferred		100.00%

Benefit Plans - Defined Contrib

Benefit Plans - Defined Contribution Plan (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)date	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Defined Contribution Plan Disclosure [Line Items]
Minimum age of eligible employee for 401(k) plan	18 years
Minimum employment period to qualify for 401(k) plan	90 days
Number of open enrollment dates for 401(k) plan | date	4
Minimum annual contribution per employee, percent of eligible compensation	1.00%
Maximum annual contribution per employee, percent of eligible compensation	50.00%
Employer matching contribution percentage	60.00%	50.00%
Employer matching contribution maximum amount	$ 4
Employer contributions	$ 555	$ 548	$ 473
Bank of Marin Employee Stock Ownership and Savings Plan (the Plan)
Defined Contribution Plan Disclosure [Line Items]
Annual vesting percentage	20.00%
Defined contribution plan, number of years to be fully vested	5 years
Cash contributed to the ESOP	$ 1,100	$ 1,200	$ 886
Employee Stock Option Plan (ESOP), January 2010
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, number of years to be fully vested	5 years

Benefit Plans - Defined Benefit

Benefit Plans - Defined Benefit Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Percentage of salary paid upon retirement	25.00%
Period before ratable vesting begins	5 years
Age ratable vesting ends	65 years
Liability under the Salary Continuation Plan	$ 823	$ 644

Income Taxes - Components of In

Income Taxes - Components of Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current tax provision
Federal	$ 7,097	$ 8,523	$ 6,717
State	2,931	3,195	2,574
Total current	10,028	11,718	9,291
Deferred tax provision (benefit)
Federal	382	(146)	(873)
State	80	126	(479)
Total deferred	462	(20)	(1,352)
Total income tax provision	$ 10,490	$ 11,698	$ 7,939

Income Taxes - Deferred Tax Ass

Income Taxes - Deferred Tax Asset and Liability (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Allowance for loan losses and off-balance sheet credit commitments	$ 5,918,000	$ 5,544,000
Net operating loss carryforwards from the NorCal acquisition	4,090,000	4,598,000
Deferred compensation plan and salary continuation plan	1,619,000	1,499,000
Fair value adjustment on loans acquired from the NorCal acquisition	1,197,000	1,647,000
Accrued but unpaid expenses	1,188,000	1,119,000
State franchise tax	1,005,000	1,100,000
Interest received on nonaccrual loans	864,000	651,000
Deferred rent and other lease incentives	595,000	584,000
Other real estate owned	448,000	448,000
Stock-based compensation	273,000	231,000
Depreciation and disposals on premises and equipment	231,000	94,000
Accretion on loans and investment securities	110,000	630,000
Net unrealized loss on securities available-for-sale	59,000	0
Other	174,000	195,000
Total gross deferred tax assets	17,771,000	18,340,000
Deferred tax liabilities:
Deferred loan origination costs and fees	(2,567,000)	(2,385,000)
Core deposit intangible asset	(1,309,000)	(1,569,000)
Unaccreted discount on subordinated debentures from the NorCal Acquisition	(1,200,000)	(1,288,000)
Net unrealized gain on securities available-for-sale	0	(498,000)
Total gross deferred tax liabilities	(5,076,000)	(5,740,000)
Net deferred tax assets	12,695,000	12,600,000
Valuation allowance of deferred tax assets	0	$ 0
Federal
Deferred tax liabilities:
Net operating loss carryforwards expected to expire	7,600,000
California
Deferred tax liabilities:
Net operating loss carryforwards expected to expire	21,300,000
Write-down of deferred tax asset	58,000
Expiration in Tax Year 2031 | California
Deferred tax liabilities:
Net operating loss carryforwards expected to expire	$ 819,000

Income Taxes - Effective Income

Income Taxes - Effective Income Tax Reconciliation (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effective Income Tax Rate Reconciliation, Percent
Federal statutory income tax rate	35.00%	35.00%	35.00%
California franchise tax, net of federal tax benefit	6.80%	6.80%	6.50%
Tax exempt interest on municipal securities and loans	(4.20%)	(3.30%)	(4.00%)
Tax exempt earnings on bank owned life insurance	(1.00%)	(0.90%)	(1.50%)
Low income housing tax credits	(0.20%)	(0.10%)	(0.30%)
Other	(0.10%)	(0.30%)	0.00%
Effective Tax Rate	36.30%	37.20%	35.70%

Commitments and Contingencies84

Commitments and Contingencies (Details) - USD ($) $ in Thousands	Jan. 28, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Leases
Commitments under operating leases, 2016		$ 3,763
Commitments under operating leases, 2017		3,755
Commitments under operating leases, 2018		3,784
Commitments under operating leases, 2019		3,526
Commitments under operating leases, 2020		3,018
Commitments under operating leases, Thereafter		3,659
Commitments under operating leases, Total		21,505
Minimum payments due on minimum sublease rentals under non-cancelable subleases		248
Rent expense included in occupancy expense		4,200	$ 4,200	$ 3,300
Visa Inc.
Loss Contingencies [Line Items]
Balance of escrow account for legal settlements maintained by Visa		$ 1,000,000
Visa Inc. | Subsequent event
Loss Contingencies [Line Items]
Settlements reached by percentage of sales volume of merchants who opted out (percent) in Visa litigation	49.00%
Estimated amount due to class plaintiffs in Visa litigation	$ 4,000,000

Concentrations of Credit Risk (

Concentrations of Credit Risk (Details) - Credit concentration risk $ in Millions	12 Months Ended
	Dec. 31, 2015USD ($)customer	Dec. 31, 2014USD ($)
U.S. Government, its agencies and Government Sponsored Enterprises (GSEs)
Concentration Risk [Line Items]
Concentration risk percentage	74.00%	58.00%
Concentration risk amount | $	$ 362.6	$ 185.4
Loans on real estate
Concentration Risk [Line Items]
Concentration risk percentage	80.00%	80.00%
Loans portfolio
Concentration Risk [Line Items]
Number of major borrowers | customer	0
Concentration risk, threshold for major borrower, percentage	5.00%

Derivative Financial Instrume86

Derivative Financial Instruments and Hedging Activities - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)derivative	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Derivatives, Fair Value [Line Items]
Interest rate contracts fair value, Asset derivatives	$ 3	$ 61
Interest rate contracts fair value	1,658	1,996
Fair value hedge
Derivatives, Fair Value [Line Items]
Net hedge ineffectiveness gain (loss), derivatives	80	(194)	$ 362
Fair value hedge | Interest income
Derivatives, Fair Value [Line Items]
Increase (decrease) in value of designated interest rate swaps recognized in interest income	280	(377)	3,680
Payment on interest rate swaps recorded in interest income	(918)	(1,002)	(1,422)
Decrease (increase) in value of hedged loans recognized in interest income	(308)	662	(3,971)
Decrease in value of yield maintenance agreement recognized against interest income	(52)	(91)	(71)
Net loss on derivatives recognized against interest income	(998)	(808)	$ (1,784)
Fair value hedge | Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Derivatives, accrued interest, interest rate swaps	$ 28	41
Interest rate swap | Fair value hedge | Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Number of derivative instruments | derivative	7
Interest rate swap | Fair value hedge | Designated as hedging instrument | Other assets
Derivatives, Fair Value [Line Items]
Interest rate contracts notional amounts, Asset derivatives	$ 4,407	4,589
Interest rate swap | Fair value hedge | Designated as hedging instrument | Other liabilities
Derivatives, Fair Value [Line Items]
Interest rate contracts notional amount, Liability derivatives	22,187	26,899
Interest rate contract | Fair value hedge | Designated as hedging instrument | Other assets
Derivatives, Fair Value [Line Items]
Interest rate contracts fair value, Asset derivatives	3	61
Interest rate contract | Fair value hedge | Designated as hedging instrument | Other liabilities
Derivatives, Fair Value [Line Items]
Interest rate contracts fair value	$ 1,658	$ 1,996

Derivative Financial Instrume87

Derivative Financial Instruments and Hedging Activities - Offsetting of Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	$ 3	$ 61
Offset in the Statements of Condition	0	0
Net Amounts of Assets Presented in the Statements of Condition	3	61
Derivative, Collateral, Obligation to Return Securities	(3)	(61)
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Received	0	0
Net Amount	0	0
Other assets | Interest rate swap
Offsetting Assets [Line Items]
Derivative assets, accrued interest, interest rate swaps	1	1
Counterparty A
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	3	61
Offset in the Statements of Condition	0	0
Net Amounts of Assets Presented in the Statements of Condition	3	61
Derivative, Collateral, Obligation to Return Securities	(3)	(61)
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Received	0	0
Net Amount	0	0
Counterparty B
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	0	0
Offset in the Statements of Condition	0	0
Net Amounts of Assets Presented in the Statements of Condition	0	0
Derivative, Collateral, Obligation to Return Securities	0	0
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Received	0	0
Net Amount	$ 0	$ 0

Derivative Financial Instrume88

Derivative Financial Instruments and Hedging Activities - Offsetting of Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	$ 1,658	$ 1,996
Gross Amounts Offset in the Statements of Condition	0	0
Net Amounts of Liabilities Presented in the Statements of Condition	1,658	1,996
Gross Amounts Not Offset in the Statements of Condition, Financial Instruments	(3)	(61)
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Pledged	(1,655)	(1,740)
Net Amount	0	195
Other liabilities | Interest rate swap
Offsetting Liabilities [Line Items]
Derivative liabilities, accrued interest, interest rate swaps	27	39
Counterparty A
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	1,390	1,616
Gross Amounts Offset in the Statements of Condition	0	0
Net Amounts of Liabilities Presented in the Statements of Condition	1,390	1,616
Gross Amounts Not Offset in the Statements of Condition, Financial Instruments	(3)	(61)
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Pledged	(1,387)	(1,360)
Net Amount	0	195
Counterparty B
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	268	380
Gross Amounts Offset in the Statements of Condition	0	0
Net Amounts of Liabilities Presented in the Statements of Condition	268	380
Gross Amounts Not Offset in the Statements of Condition, Financial Instruments	0	0
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Pledged	(268)	(380)
Net Amount	$ 0	$ 0

Regulatory Matters (Details)

Regulatory Matters (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Bancorp
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital, Actual, Amount	$ 227,269	$ 210,067
Total Capital (to risk-weighted assets), Actual, Ratio	13.37%	13.94%
Total Capital, Minimum Capital for Capital Adequacy Purposes, Amount	$ 135,996	$ 120,580
Total Capital (to risk-weighted assets), Minimum Capital for Capital Adequacy Purposes, Ratio	8.00%	8.00%
Tier 1 Risk Based Capital, Actual, Amount	$ 211,521	$ 193,956
Tier 1 Risk Based Capital (to risk-weighted assets), Actual, Ratio	12.44%	12.87%
Tier 1 Capital, Minimum Capital for Capital Adequacy Purposes, Amount	$ 101,997	$ 60,290
Tier 1 Risk Based Capital (to risk-weighted assets), Minimum Capital for Capital Adequacy Purposes, Ratio	6.00%	4.00%
Tier 1 Leverage Capital, Amount, Actual	$ 211,521	$ 193,956
Tier 1 Leverage Capital (to average assets), Actual, Ratio	10.67%	10.62%
Tier 1 Leverage Capital, Minimum Capital for Capital Adequacy Purposes, Amount	$ 79,296	$ 73,079
Tier 1 Leverage Capital (to average assets), Minimum Capital for Capital Adequacy Purposes, Ratio	4.00%	4.00%
Tier 1 Common Equity	$ 206,724
Tier 1 Common Equity To Average Assets	12.16%
Tier 1 Common Equity Required for Capital Adequacy	$ 76,498
Tier 1 Common Equity Required for Capital Adequacy to Average Assets	4.50%
The Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital, Actual, Amount	$ 222,830	$ 206,465
Total Capital (to risk-weighted assets), Actual, Ratio	13.11%	13.70%
Total Capital, Minimum Capital for Capital Adequacy Purposes, Amount	$ 135,968	$ 120,553
Total Capital (to risk-weighted assets), Minimum Capital for Capital Adequacy Purposes, Ratio	8.00%	8.00%
Total Capital, Minimum Capital to be Well Capitalized, Amount	$ 169,960	$ 150,692
Total Capital (to risk-weighted assets), Minimum to be Well Capitalized, Ratio	10.00%	10.00%
Tier 1 Risk Based Capital, Actual, Amount	$ 207,082	$ 190,354
Tier 1 Risk Based Capital (to risk-weighted assets), Actual, Ratio	12.18%	12.63%
Tier 1 Capital, Minimum Capital for Capital Adequacy Purposes, Amount	$ 101,976	$ 60,277
Tier 1 Risk Based Capital (to risk-weighted assets), Minimum Capital for Capital Adequacy Purposes, Ratio	6.00%	4.00%
Tier 1 Risk Based Capital, Minimum Capital to be Well Capitalized, Amount	$ 135,968	$ 90,415
Tier 1 Risk Based Capital (to risk-weighted assets), Minimum Capital to be Well Capitalized, Ratio	8.00%	6.00%
Tier 1 Leverage Capital, Amount, Actual	$ 207,082	$ 190,354
Tier 1 Leverage Capital (to average assets), Actual, Ratio	10.45%	10.42%
Tier 1 Leverage Capital, Minimum Capital for Capital Adequacy Purposes, Amount	$ 79,268	$ 73,064
Tier 1 Leverage Capital (to average assets), Minimum Capital for Capital Adequacy Purposes, Ratio	4.00%	4.00%
Tier 1 Leverage Capital, Actual, Amount	$ 99,085	$ 91,330
Tier 1 Leverage Capital (to average assets), Minimum Capital to be Well Capitalized, Ratio	5.00%	5.00%
Tier 1 Common Equity	$ 207,082
Tier 1 Common Equity To Average Assets	12.18%
Tier 1 Common Equity Required for Capital Adequacy	$ 76,482
Tier 1 Common Equity Required for Capital Adequacy to Average Assets	4.50%
Tier 1 Common Equity Required to be Well Capitalized	$ 110,474
Tier 1 Common Equity Required to be Well Capitalized to Average Assets	6.50%

Financial Instruments with Of90

Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Lines of credit and standby letters of credit, unused
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loan commitments and standby letters of credit, off-balance sheet	$ 376,600	$ 349,300
Percentage of commitments expiring in 2016	42.00%
Percentage of commitments expiring between 2017 and 2023	41.00%
Percentage of commitments expiring 2024 and thereafter	17.00%
Lines of credit and standby letters of credit, unused | Interest Payable and Other Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Allowance for off-balance sheet commitments	$ 749	1,000
Commercial lines of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loan commitments and standby letters of credit, off-balance sheet	191,300	173,300
Revolving home equity lines
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loan commitments and standby letters of credit, off-balance sheet	130,400	115,600
Undisbursed construction loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loan commitments and standby letters of credit, off-balance sheet	39,400	46,700
Personal and other lines of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loan commitments and standby letters of credit, off-balance sheet	11,100	11,600
Standby letters of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loan commitments and standby letters of credit, off-balance sheet	$ 4,400	$ 2,100

Condensed Bank of Marin Banco91

Condensed Bank of Marin Bancorp Parent Only Financial Statements - Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Other assets	$ 62,284	$ 60,199
Total assets	2,031,134	1,787,130
Subordinated debentures	5,395	5,185
Other liabilities	16,040	15,300
Total liabilities	1,816,661	1,587,104
Stockholders' equity	214,473	200,026	$ 180,887	$ 151,792
Total liabilities and stockholders' equity	2,031,134	1,787,130
Bancorp
Condensed Financial Statements, Captions [Line Items]
Cash and due from Bank of Marin	3,796	3,228
Investment in bank subsidiary	215,722	201,609
Other assets	770	454
Total assets	220,288	205,291
Subordinated debentures	5,395	5,185
Accrued expenses payable	109	80
Other liabilities	311	0
Total liabilities	5,815	5,265
Stockholders' equity	214,473	200,026
Total liabilities and stockholders' equity	$ 220,288	$ 205,291

Condensed Bank of Marin Banco92

Condensed Bank of Marin Bancorp Parent Only Financial Statements - Income Statement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Interest expense	$ 2,251	$ 2,349	$ 1,785
Non-interest expense	46,949	47,263	44,092
Income tax benefit	(10,490)	(11,698)	(7,939)
Net income	18,441	19,771	14,270
Bancorp
Condensed Financial Statements, Captions [Line Items]
Dividends from bank subsidiary	6,500	0	28,000
Miscellaneous Income	6	8	0
Total income	6,506	8	28,000
Interest expense	420	421	34
Non-interest expense	973	851	1,313
Total expense	1,393	1,272	1,347
Income (loss) before income taxes and equity in undistributed net income of subsidiary	5,113	(1,264)	26,653
Income tax benefit	583	532	382
Income (loss) before equity in undistributed net income of subsidiary	5,696	(732)	27,035
Earnings of bank subsidiary greater (less) than dividends received from bank subsidiary	12,745	20,503	(12,765)
Net income	$ 18,441	$ 19,771	$ 14,270

Condensed Bank of Marin Banco93

Condensed Bank of Marin Bancorp Parent Only Financial Statements - Cash Flow Statement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Net income	$ 18,441	$ 19,771	$ 14,270
Accretion of discount on subordinated debentures	210	216	19
Other assets	1,081	(184)	299
Other liabilities	1,359	(2,430)	4,959
Net cash provided by operating activities	23,682	18,857	21,201
Net cash used in investing activities	(263,278)	(42,652)	(36,948)
Dividends paid on common stock	(5,390)	(4,733)	(3,970)
Net cash provided (used in) by financing activities	224,572	(38,611)	91,171
Net increase (decrease) in cash and cash equivalents	(15,024)	(62,406)	75,424
Stock issued in payment of director fees	275	236	222
Fair value of assets acquired	0	0	280,917
Fair value of liabilities assumed	0	0	246,384
Stock issued to NorCal Community Bancorp shareholders	0	0	18,514
Bancorp
Condensed Financial Statements, Captions [Line Items]
Net income	18,441	19,771	14,270
Earnings of bank subsidiary (greater) less than dividends received from bank subsidiary	(12,745)	(20,503)	12,765
Accretion of discount on subordinated debentures	210	216	19
Other assets	(298)	(88)	74
Intercompany receivable	(18)	0	0
Other liabilities	368	(99)	165
Net cash provided by operating activities	5,958	(703)	27,293
Capital contribution to subsidiary	(1,156)	(1,475)	(2,258)
Cash consideration paid for acquisition, net of cash acquired	0	0	(15,952)
Net cash used in investing activities	(1,156)	(1,475)	(18,210)
Stock options exercised and stock purchases	1,156	1,475	2,258
Dividends paid on common stock	(5,390)	(4,733)	(3,970)
Net cash provided (used in) by financing activities	(4,234)	(3,258)	(1,712)
Net increase (decrease) in cash and cash equivalents	568	(5,436)	7,371
Cash and cash equivalents at beginning of period	3,228	8,664	1,293
Cash and cash equivalents at end of period	3,796	3,228	8,664
Stock issued in payment of director fees	275	236	222
Fair value of assets acquired	0	0	39,503
Fair value of liabilities assumed	0	0	4,970
Stock issued to NorCal Community Bancorp shareholders	$ 0	$ 0	$ 18,514