Bank of Marin Bancorp (BMRC) 10-K 14 Mar 17 2016 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Feb. 28, 2017	Jun. 30, 2016
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			$ 292
Entity Common Stock, Shares Outstanding		6,129,817
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2016

CONSOLIDATED STATEMENTS OF COND

CONSOLIDATED STATEMENTS OF CONDITION - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets
Cash and due from banks	$ 48,804	$ 26,343
Investment securities
Held-to-maturity, at amortized cost	44,438	69,637
Available-for-sale, at fair value	372,580	417,787
Total investment securities	417,018	487,424
Loans, net of allowance for loan losses of $15,442 and $14,999 at December 31, 2016 and 2015, respectively	1,471,174	1,436,229
Bank premises and equipment, net	8,520	9,305
Goodwill	6,436	6,436
Core deposit intangible	2,580	3,113
Interest receivable and other assets	68,961	62,284
Total assets	2,023,493	2,031,134
Deposits
Non-interest bearing	817,031	770,087
Interest bearing
Transaction accounts	100,723	114,277
Savings accounts	163,516	141,316
Money market accounts	539,967	541,089
Time accounts	151,463	161,457
Total deposits	1,772,700	1,728,226
Federal Home Loan Bank (FHLB) borrowings	0	67,000
Subordinated debentures	5,586	5,395
Interest payable and other liabilities	14,644	16,040
Total liabilities	1,792,930	1,816,661
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 - 6,127,314 and 6,068,543 at December 31, 2016 and 2015, respectively	87,392	84,727
Retained earnings	146,464	129,553
Accumulated other comprehensive (loss) income, net	(3,293)	193
Total stockholders' equity	230,563	214,473
Total liabilities and stockholders' equity	$ 2,023,493	$ 2,031,134

CONSOLIDATED STATEMENTS OF CON3

CONSOLIDATED STATEMENTS OF CONDITION (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investment Securities
Loans, allowance for loan losses	$ 15,442	$ 14,999
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)	6,127,314	6,068,543
Common stock, outstanding (in shares)	6,127,314	6,068,543

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest income
Interest and fees on loans	$ 67,472	$ 61,754	$ 64,823
Interest on investment securities
Securities of U.S. government agencies	5,155	4,709	4,502
Obligations of state and political subdivisions	2,339	2,155	2,273
Corporate debt securities and other	256	685	1,031
Interest on federal funds sold and due from banks	208	135	161
Total interest income	75,430	69,438	72,790
Interest expense
Interest on interest-bearing transaction accounts	109	115	99
Interest on savings accounts	58	51	46
Interest on money market accounts	445	495	550
Interest on time accounts	743	853	917
Interest on FHLB and overnight borrowings	478	317	315
Interest on subordinated debentures	436	420	422
Total interest expense	2,269	2,251	2,349
Net interest income	73,161	67,187	70,441
(Reversal of) provision for loan losses	(1,850)	500	750
Net interest income after provision for loan losses	75,011	66,687	69,691
Non-interest income
Service charges on deposit accounts	1,789	1,979	2,167
Wealth Management and Trust Services	2,090	2,391	2,309
Debit card interchange fees	1,503	1,445	1,378
Merchant interchange fees	449	545	803
Earnings on bank-owned life Insurance	844	814	841
Dividends on FHLB stock	1,153	1,003	563
Gains on investment securities, net	425	79	80
Other income	908	937	900
Total non-interest income	9,161	9,193	9,041
Non-interest expense
Salaries and related benefits	26,663	25,764	25,005
Occupancy and equipment	5,081	5,498	5,470
Depreciation and amortization	1,822	1,968	1,585
Federal Deposit Insurance Corporation insurance	825	997	1,032
Data processing	3,625	3,318	3,665
Professional services	2,044	2,121	2,230
Directors' expense	553	826	628
Information technology	862	736	675
Provision for (reversal of) losses on off-balance sheet commitments	150	(263)	334
Other expense	6,067	5,984	6,639
Total non-interest expense	47,692	46,949	47,263
Income before provision for income taxes	36,480	28,931	31,469
Provision for income taxes	13,346	10,490	11,698
Net income	$ 23,134	$ 18,441	$ 19,771
Net income per common share:
Basic (in dollars per share)	$ 3.81	$ 3.09	$ 3.35
Diluted (in dollars per share)	$ 3.78	$ 3.04	$ 3.29
Weighted average shares:
Basic (in shares)	6,073	5,966	5,893
Diluted (in shares)	6,115	6,065	6,006
Dividends declared per common share (in dollars per share)	$ 1.02	$ 0.90	$ 0.80
Comprehensive income:
Net income	$ 23,134	$ 18,441	$ 19,771
Other comprehensive income
Change in net unrealized gain or loss on available-for-sale securities	(5,658)	(1,420)	2,939
Reclassification adjustment for (gains) losses on available-for-sale securities included in net income	(394)	(6)	24
Net change in unrealized gain or loss on available-for-sale securities, before tax	(6,052)	(1,426)	2,963
Deferred tax (benefit) expense	(2,566)	(531)	1,203
Other comprehensive (loss) income, net of tax	(3,486)	(895)	1,760
Comprehensive income	$ 19,648	$ 17,546	$ 21,531

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, 2013		5,877,524
Balance at Dec. 31, 2013	$ 180,887	$ 80,095	$ 101,464	$ (672)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	19,771		19,771
Other comprehensive income (loss)	$ 1,760			1,760
Stock options exercised (in shares)	49,415	49,415
Stock options exercised	$ 1,452	$ 1,452
Excess tax benefit - stock-based compensation	172	$ 172
Stock issued under employee stock purchase plan (in shares)		521
Stock issued under employee stock purchase plan	23	$ 23
Restricted stock granted (in shares)		8,523
Restricted stock granted	0	$ 0
Restricted stock forfeited/cancelled (in shares)		(2,067)
Restricted stock forfeited/cancelled	0	$ 0
Stock-based compensation - stock options	200	200
Stock-based compensation - restricted stock	246	$ 246
Cash dividends paid on common stock	(4,733)		(4,733)
Stock purchased by directors under director stock plan (in shares)		260
Stock purchased by directors under director stock plan	12	$ 12
Stock issued in payment of director fees (in shares)		5,306
Stock issued in payment of director fees	236	$ 236
Balance (in shares) at Dec. 31, 2014		5,939,482
Balance at Dec. 31, 2014	200,026	$ 82,436	116,502	1,088
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	18,441		18,441
Other comprehensive income (loss)	$ (895)			(895)
Stock options exercised (in shares)	37,071	37,071
Stock options exercised	$ 1,139	$ 1,139
Excess tax benefit - stock-based compensation	212	$ 212
Stock issued under employee stock purchase plan (in shares)		339
Stock issued under employee stock purchase plan	17	$ 17
Restricted stock granted (in shares)		15,970
Restricted stock granted	0	$ 0
Restricted stock forfeited/cancelled (in shares)		(450)
Restricted stock forfeited/cancelled	0	$ 0
Stock-based compensation - stock options	252	252
Stock-based compensation - restricted stock	384	$ 384
Cash dividends paid on common stock	(5,390)		(5,390)
Stock purchased by directors under director stock plan (in shares)		245
Stock purchased by directors under director stock plan	12	$ 12
Stock issued in payment of director fees (in shares)		5,295
Stock issued in payment of director fees	275	$ 275
Stock issued from exercise of warrants (in shares)		70,591
Stock issued from exercise of warrants	$ 0	$ 0
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	23,134	0	23,134	0
Other comprehensive income (loss)	$ (3,486)	$ 0	0
Stock options exercised (in shares)	36,117	36,117
Stock options exercised	$ 1,227	$ 1,227
Excess tax benefit - stock-based compensation	161	$ 161
Stock issued under employee stock purchase plan (in shares)		621
Stock issued under employee stock purchase plan	32	$ 32
Restricted stock granted (in shares)		16,910
Restricted stock granted	0	$ 0
Stock-based compensation - stock options	347	347
Stock-based compensation - restricted stock	638	$ 638
Cash dividends paid on common stock	(6,223)		(6,223)
Stock purchased by directors under director stock plan (in shares)		516
Stock purchased by directors under director stock plan	26	$ 26
Stock issued in payment of director fees (in shares)		4,607
Stock issued in payment of director fees	$ 234	$ 234
Balance (in shares) at Dec. 31, 2016	6,127,314	6,127,314
Balance at Dec. 31, 2016	$ 230,563	$ 87,392	$ 146,464	$ (3,293)

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows from Operating Activities:
Net income	$ 23,134	$ 18,441	$ 19,771
Adjustments to reconcile net income to net cash provided by operating activities:
(Reversal of) provision for loan losses	(1,850)	500	750
Provision for (reversal of) losses on off-balance sheet commitments	150	(263)	334
Compensation expense--common stock for director fees	180	274	270
Stock-based compensation expense	985	636	446
Excess tax benefits from exercised stock options	(161)	(187)	(118)
Amortization of core deposit intangible	533	619	771
Amortization of investment security premiums, net of accretion of discounts	3,212	2,825	2,759
Accretion of discount on acquired loans	(1,775)	(1,883)	(3,906)
Accretion of discount on subordinated debentures	191	210	216
Net amortization of deferred loan origination costs/fees	114	(281)	(463)
Write-down of other real estate owned	13	40	0
Gain on sale of investment securities	(425)	(79)	(93)
Other-than-temporary impairment on securities available-for-sale	0	0	13
Depreciation and amortization	1,822	1,968	1,585
Loss on disposal of premises and equipment	3	4	0
Earnings on bank owned life insurance policies	(844)	(814)	(841)
Net change in operating assets and liabilities:
Interest receivable	324	(734)	(143)
Interest payable	(53)	(26)	(40)
Deferred rent and other rent-related expenses	(254)	(4)	160
Other assets	257	1,081	(184)
Other liabilities	(110)	1,355	(2,430)
Net cash provided by operating activities	25,446	23,682	18,857
Cash Flows from Investing Activities:
Purchase of held-to-maturity securities	(2,424)	(2,375)	0
Purchase of available-for-sale securities	(161,374)	(287,144)	(18,206)
Proceeds from sale of available-for-sale securities	68,673	2,099	2,436
Proceeds from sale of held-to-maturity securities	1,265	1,015	2,146
Proceeds from paydowns/maturities of held-to-maturity securities	25,779	47,181	16,793
Proceeds from paydowns/maturities of available-for-sale securities	129,669	64,839	46,371
Loans originated and principal collected, net	(32,005)	(88,123)	(88,872)
Purchase of bank owned life insurance policies	(2,133)	0	0
Purchase of premises and equipment	(1,040)	(1,418)	(2,334)
Proceeds from sale of repossessed assets	0	1,502	0
Purchase of Federal Home Loan Bank stock	(1,791)	(136)	(492)
Cash paid for low income housing investment	(301)	(718)	(494)
Net cash provided by (used in) investing activities	24,318	(263,278)	(42,652)
Cash Flows from Financing Activities:
Net increase (decrease) in deposits	44,474	176,607	(35,483)
Proceeds from stock options exercised	1,227	1,139	1,452
Federal Home Loan Bank (repayments) borrowings	(67,000)	52,000	0
Cash dividends paid on common stock	(6,223)	(5,390)	(4,733)
Proceeds from stock issued under employee and director stock purchase plans	58	29	35
Excess tax benefits from exercised stock options	161	187	118
Net cash (used in) provided by financing activities	(27,303)	224,572	(38,611)
Net increase (decrease) in cash and cash equivalents	22,461	(15,024)	(62,406)
Cash and cash equivalents at beginning of period	26,343	41,367	103,773
Cash and cash equivalents at end of period	48,804	26,343	41,367
Supplemental disclosure of cash flow items, non-cash investing and financing activities:
Cash paid in interest	2,131	2,066	2,185
Cash paid in income taxes	13,365	9,068	11,290
Change in unrealized gain on available-for-sale securities	(6,052)	(1,426)	2,963
Stock issued in payment of director fees	234	275	236
Subscription in low income housing tax credit investment	0	1,023	1,000
Securities transferred from available-for-sale to held-to-maturity	0	0	14,297
Transfer of loan to loans held-for-sale at fair value	$ 0	$ 1,502	$ 0

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2016
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, except for the transfer of certain investment securities from the available-for-sale category to held-to-maturity as discussed in Note 2, Investment Securities, herein. The NorCal Community Bancorp Trusts I and II, respectively (the "Trusts"), 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 (See Note 7, Borrowings). Bancorp's investment in the securities 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 9, Fair Value of Assets and Liabilities. 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 borrower has resumed paying the full amount of the principal and interest and we are satisfied with the borrower's financial position. In order to meet this test, we must have received repayment of all past due principal and interest unless the amounts contractually due are reasonably assured of repayment within a reasonable period of time, and there has been a sustained period of repayment performance (generally, six consecutive monthly payments), according to the original contractual terms or 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”). • The loan has become well secured and is in the process of collection. 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. Overdraft accounts are generally charged off when they exceed 60 days past due. Acquired Loans : 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. 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 process of calculating fair values of acquired loans, including estimates of losses expected to be incurred over the estimated remaining lives of the loans at acquisition date and ongoing updates to Management's expectation of future cash flows, requires significant subjective judgments and assumptions. The economic environment and lack of market liquidity and transparency are factors that have influenced, and may continue to affect, these assumptions and estimates. We acquired loans 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 could not be reasonably estimated. The difference between the undiscounted expected cash flows expected to be collected and the fair value at acquisition date ("accretable difference") is accreted into interest income at a level yield of return over the estimated remaining life of the PCI loan, 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 financial conditions of the borrowers and the market conditions. Probable decreases in expected cash flows after acquisition result in impairment recorded as a specific allowance for loan losses or a charge-off to the allowance. Impairment is calculated as the present value of the expected future cash flows on the PCI loan, discounted at the loan's effective interest rate implicit in the loan. 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. 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. For further information regarding our acquired loans, see Note 3, Loans and 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 quantitative (e.g., historical loan loss rates) and qualitative risk 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 an 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 second component is an estimate of the probable inherent losses in each loan pool with similar 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 federal regulatory reporting codes ("CALL codes" or "segments"), which are further delineated by assigned credit risk ratings, as described in Note 3, Loans and Allowance for Loan Losses. Segments include the following: • 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 general allowances by loan segment based on quantitative (loss history) and qualitative risk factors. Qualitative internal and external risk factors include, but are not limited to, the following: • Changes in the nature and volume of the loan portfolio. • Changes in the volume and severity of past due loans, the volume of non-accruals loans, and the volume and severity of adversely classified or graded loans. • The existence and effect of individual loan and loan segment concentrations. • Changes in lending policies and procedures, including changes in underwriting standards and collection, charge-off, and recovery practices not considered elsewhere. • Changes in the experience, ability, and depth of lending management and other relevant staff. • Changes in the quality of our systematic loan review processes. • Changes in economic and business conditions, and developments that affect the collectability of the portfolio. • Changes in the value of underlying collateral, where applicable. • The effect of other external factors such as legal and regulatory requirements on the level of estimated credit losses in the portfolio. • The effect of acquisitions of other loan portfolios on our infrastructure, including risk associated with entering new geographic areas as a result of such acquisitions. • The presence of specialized lending segments in the portfolio. Beginning with the quarter ended March 31, 2016, Management enhanced its methodology for determining the quantitative and qualitative risk factors assigned to unimpaired loans in order to capture historical loss information at the loan level, track loss migration through risk grade deterioration, increase efficiencies related to performing the calculations, and refine how we incorporate environmental and other unique risk elements into our estimation of credit losses. The changes in methodology did not result in a material difference in general allowances. Prior to March 31, 2016, under the Bank's allowance model, each segment was assigned a quantitative loss factor that was primarily based on a rolling twenty-quarter look-back at our historical losses for that particular segment, as well as a number of other assumptions. Under the current methodology, the quantitative risk factor for each segment utilizes the greater of either the historical loss method based on a rolling twenty-four-quarter look-back period or migration analysis loss method based on loss history beginning March 2010. Under the historical loss method, quarterly loss rates are calculated for each segment by dividing annualized net charge-offs during each quarter by the quarter's average segment balances. The quarterly loss rates are averaged over the entire loss history period. Under the migration analysis method, loss rates are calculated at the risk grade and segment levels by dividing the net charge-off amount by the total segment balance at the beginning of each migration period where the charged-off loan in question was present. Migration loss rates are averaged for each risk grade and segment for the entire loss history period. For each segment, the loss rates that result in the larger of the migration loss reserves or segment historical loss reserves are applied to the current loan balances. Qualitative factors are combined with these quantitative factors at the segment level to arrive at the overall general allowances. We establish specific allowances to account for credit deterioration for probable decreases in cash flows for PCI loans subsequent to acquisition. The estimated cash flows expected to be collected on PCI loans is updated quarterly and requires the use of key assumptions and estimates based on factors such as the current economic environment, changes in collateral values, loan workout plans, changes in the probability of default, loss severities, and prepayments. Probable decreases in expected cash flows after acquisition result in impairment recorded as a specific allowance for loan losses or a charge-off to the allowance. Impairment is calculated as the present value of the expected future cash flows on the PCI loan, discounted at the loan's effective interest rate implicit in the loan. While we believe we use the best information available to determine the allowance for loan losses, our results of operations could be significantly affected if circumstances differ substantially from the assumptions used in determining the allowance. A decline in local and national economic conditions, or significant changes in other assumptions, could result in a material increase in the allowance for loan losses and may adversely affect our financial condition and results of operations. In addition, the determination of the amount of the allowance for loan losses is subject to review by bank regulators as part of their routine examination process, which may result in the establishment of additional allowance for loan losses based upon their judgment of information available to them at the time of their examination. For further information regarding the allowance for loan losses, see Note 3, Loans and Allowance for Loan Losses. 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 estimates of probability that these commitments will be 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 2016 , 2015 and 2014 . 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 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 the estimated future benefit of deposits related to an acquisition and is booked separately from the related deposits and evaluated periodically for impairment. The core deposit intangible asset is amortized on an accelerated method over its estimated useful life of ten years. At December 31, 2016, the future estimated amortization expense is as follows: (in thousands) 2017 2018 2019 2020 2021 Thereafter Total Core deposit intangible amortization $ 472 $ 413 $ 388 $ 365 $ 343 $ 599 $ 2,580 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 more likely than not that the fair value is more 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 ("BOLI") : The Bank owns life insurance policies on certain key current and former officers. 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 expens

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2016
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: MBS pass-through securities issued by FHLMC and FNMA $ 2,332 $ (7 ) $ — $ — $ 2,332 $ (7 ) Obligations of state and 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 and 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 ) As of December 31, 2016 , there was one debenture of government-sponsored agency security that had been in a continuous loss position for twelve months or more. We have evaluated it 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 as it is supported by the U.S. Federal Government, which protects us from credit losses. Based upon our assessment of the credit fundamentals, we concluded that this security was not other-than-temporarily impaired at December 31, 2016 . One hundred thirty-three investment securities in our portfolio were in a temporary loss position for less than twelve months as of December 31, 2016 , and their temporary loss positions mainly arose from changes in interest rates since purchase. They consisted of eighty-six obligations of U.S. state and political subdivisions, one corporate bond, thirty-one MBS securities, thirteen CMOs, one privately issued CMO and one debenture of government-sponsored agencies. The MBS, CMOs and debentures issued by government-sponsored agencies are supported by the U.S. Federal Government, which protects us from credit losses. Other temporarily impaired securities are deemed creditworthy after internal analysis of the issuers' latest financial information and credit enhancement. Additionally, all are rated as investment grade by at least one major rating agency. As a result of this impairment analysis, we concluded that these securities were not other-than-temporarily impaired at December 31, 2016 . Non-Marketable Securities As a member of the FHLB, we are required to maintain a minimum investment in FHLB capital stock determined by the Board of Directors of the FHLB. The minimum investment requirements can increase in the event we increase our total asset size or borrowings with the FHLB. Shares cannot be purchased or sold except between the FHLB and its members at the $100 per share par value. We held $10.2 million and $8.4 million of FHLB stock recorded at cost in other assets on the consolidated statements of condition at December 31, 2016 and 2015 , 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, due to FHLB's current financial position. On February 21, 2017, FHLB announced a cash dividend for the fourth quarter of 2016 at an annualized dividend rate of 9.08% to be distributed in mid-March 2017. Cash dividends paid on FHLB capital stock are recorded as non-interest income. 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. When converting this Class B common stock to Class A common stock under the conversion rate of 1.6483 , as of the latest SEC Form 10-Q filed by Visa, Inc. on February 2, 2017, and the closing stock price of Class A shares, the value of our shares of Class B common stock would have been $2.2 million at both December 31, 2016 and 2015 . 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 12, Commitments and Contingencies herein. We invest in low income housing tax credit funds as a limited partner, which totaled $2.5 million and $2.7 million recorded in other assets as of December 31, 2016 and 2015 , respectively. In 2016 , we recognized $297 thousand of low income housing tax credits and other tax benefits, net of $236 thousand of amortization expense of low income housing tax credit investment, as a component of income tax expense. As of December 31, 2016 , our unfunded commitments for these low income housing tax credit funds totaled $1.4 million . We did not recognize any impairment losses on these low income housing tax credit investments during 2016 or 2015 ." 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, 2016 December 31, 2015 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 $ 30,856 $ 31,544 $ 694 $ (6 ) $ 42,919 $ 44,146 $ 1,246 $ (19 ) Corporate bonds 3,519 3,518 — (1 ) 15,072 15,098 42 (16 ) MBS pass-through securities issued by FHLMC and FNMA 10,063 10,035 126 (154 ) 11,646 11,810 171 (7 ) Total held-to-maturity 44,438 45,097 820 (161 ) 69,637 71,054 1,459 (42 ) Available-for-sale: Securities of U.S. government agencies: MBS pass-through securities issued by FHLMC and FNMA 193,998 190,566 145 (3,577 ) 138,222 138,462 694 (454 ) CMOs issued by FNMA 13,790 13,772 91 (109 ) 18,266 18,219 97 (144 ) CMOs issued by FHLMC 43,452 42,758 37 (731 ) 22,889 22,932 82 (39 ) CMOs issued by GNMA 6,844 6,945 102 (1 ) 10,326 10,480 169 (15 ) Debentures of government- sponsored agencies 35,486 35,403 7 (90 ) 161,690 160,892 28 (826 ) Privately issued CMOs 419 419 1 (1 ) 3,960 4,150 190 — Obligations of state and political subdivisions 79,306 77,701 135 (1,740 ) 57,110 57,673 580 (17 ) Corporate bonds 4,959 5,016 57 — 4,947 4,979 43 (11 ) Total available-for-sale 378,254 372,580 575 (6,249 ) 417,410 417,787 1,883 (1,506 ) Total investment securities $ 422,692 $ 417,677 $ 1,395 $ (6,410 ) $ 487,047 $ 488,841 $ 3,342 $ (1,548 ) The amortized cost and fair value of investment debt securities by contractual maturity at December 31, 2016 are shown below. Expected maturities may differ from contractual maturities if the issuers of the securities have the right to call or prepay obligations with or without call or prepayment penalties. December 31, 2016 December 31, 2015 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 $ 13,473 $ 13,506 $ 20,136 $ 20,109 $ 18,853 $ 18,920 $ 12,135 $ 12,176 After one but within five years 16,706 17,150 58,334 58,267 31,677 32,360 188,007 187,326 After five years through ten years 3,000 3,125 113,576 110,842 8,580 8,969 64,899 64,999 After ten years 11,259 11,316 186,208 183,362 10,527 10,805 152,369 153,286 Total $ 44,438 $ 45,097 $ 378,254 $ 372,580 $ 69,637 $ 71,054 $ 417,410 $ 417,787 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) 2016 2015 2014 Available-for-sale: Sales proceeds $ 68,673 $ 2,099 $ 2,436 Gross realized gains $ 458 $ 7 $ 4 Gross realized losses $ (64 ) $ (1 ) $ (28 ) Held-to-maturity: Sales proceeds $ 1,265 $ 1,015 $ 2,146 Gross realized gains $ 32 $ 73 $ 104 Gross realized losses $ — $ — $ — Investment securities carried at $109.1 million and $87.9 million at December 31, 2016 and 2015 , respectively, were pledged with the State of California: $108.3 million million and $87.1 million to secure public deposits in compliance with the Local Agency Security Program at December 31, 2016 and 2015 , respectively, and $822 thousand and $840 thousand to provide collateral for trust deposits. In addition, investment securities carried at $2.1 million and $1.1 million were pledged to collateralize a Wealth Management and Trust Services (“WMTS”) checking account at December 31, 2016 and 2015 , respectively. As part of our ongoing review of our investment securities portfolio, we reassessed the classification of certain MBS pass-through and CMOs securities issued by FHLMC and FNMA. Effective February 24, 2017, we transferred $129 million of these securities, which we intend and have the ability to hold to maturity, from available-for-sale securities to held-to-maturity at fair value. The unrealized pre-tax loss of $3.0 million at the date of transfer remained in accumulated other comprehensive income and is amortized over the remaining lives of the securities. Other-Than-Temporarily Impaired ("OTTI") Debt Securities We have evaluated the credit 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, 2016 . 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, 2016 before recovery of the amortized cost basis. One hundred thirty-four and fifty-four investment securities were in unrealized loss positions at December 31, 2016 and 2015 , respectively. Those securities are summarized and classified according to the duration of the loss period in the tables below: December 31, 2016 < 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 $ 2,250 $ (154 ) $ 2,250 $ (154 ) Obligations of state and political subdivisions 3,362 (6 ) 3,362 (6 ) Corporate bonds 3,518 (1 ) 3,518 (1 ) Total held-to-maturity 9,130 (161 ) — — 9,130 (161 ) Available-for-sale: MBS pass-through securities issued by FHLMC and FNMA 162,016 (3,577 ) 162,016 (3,577 ) CMOs issued by FNMA 9,498 (109 ) 9,498 (109 ) CMOs issued by FHLMC 31,545 (731 ) 31,545 (731 ) CMOs issued by GNMA 1,583 (1 ) 1,583 (1 ) Debentures of government- sponsored agencies 19,951 (38 ) 9,946 (52 ) 29,897 (90 ) Obligations of state and political subdivisions 59,567 (1,740 ) 59,567 (1,740 ) Privately issued CMO's 154 (1 ) 154 (1 ) Total available-for-sale 284,314 (6,197 ) 9,946 (52 ) 294,260 (6,249 ) Total temporarily impaired securities $ 293,444 $ (6,358 ) $ 9,946 $ (52 ) $ 303,390 $ (6,410 ) 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 and 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 and 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 ) As of December 31, 2016 , there was one debenture of government-sponsored agency security that had been in a continuous loss position for twelve months or more. We have evaluated it 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 as it is supported by the U.S. Federal Government, which protects us from credit losses. Based upon our assessment of the credit fundamentals, we concluded that this security was not other-than-temporarily impaired at December 31, 2016 . One hundred thirty-three investment securities in our portfolio were in a temporary loss position for less than twelve months as of December 31, 2016 , and their temporary loss positions mainly arose from changes in interest rates since purchase. They consisted of eighty-six obligations of U.S. state and political subdivisions, one corporate bond, thirty-one MBS securities, thirteen CMOs, one privately issued CMO and one debenture of government-sponsored agencies. The MBS, CMOs and debentures issued by government-sponsored agencies are supported by the U.S. Federal Government, which protects us from credit losses. Other temporarily impaired securities are deemed creditworthy after internal analysis of the issuers' latest financial information and credit enhancement. Additionally, all are rated as investment grade by at least one major rating agency. As a result of this impairment analysis, we concluded that these securities were not other-than-temporarily impaired at December 31, 2016 . Non-Marketable Securities As a member of the FHLB, we are required to maintain a minimum investment in FHLB capital stock determined by the Board of Directors of the FHLB. The minimum investment requirements can increase in the event we increase our total asset size or borrowings with the FHLB. Shares cannot be purchased or sold except between the FHLB and its members at the $100 per share par value. We held $10.2 million and $8.4 million of FHLB stock recorded at cost in other assets on the consolidated statements of condition at December 31, 2016 and 2015 , 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, due to FHLB's current financial position. On February 21, 2017, FHLB announced a cash dividend for the fourth quarter of 2016 at an annualized dividend rate of 9.08% to be distributed in mid-March 2017. Cash dividends paid on FHLB capital stock are recorded as non-interest income. 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. When converting this Class B common stock to Class A common stock under the conversion rate of 1.6483 , as of the latest SEC Form 10-Q filed by Visa, Inc. on February 2, 2017, and the closing stock price of Class A shares, the value of our shares of Class B common stock would have been $2.2 million at both December 31, 2016 and 2015 . 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 12, Commitments and Contingencies herein. We invest in low income housing tax credit funds as a limited partner, which totaled $2.5 million and $2.7 million recorded in other assets as of December 31, 2016 and 2015 , respectively. In 2016 , we recognized $297 thousand of low income housing tax credits and other tax benefits, net of $236 thousand of amortization expense of low income housing tax credit investment, as a component of income tax expense. As of December 31, 2016 , our unfunded commitments for these low income housing tax credit funds totaled $1.4 million . We did not recognize any impairment losses on these low income housing tax credit investments during 2016 or 2015 .

Loans and Allowance for Loan Lo

Loans and Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2016
Receivables [Abstract]
Loans and Allowance for Loan Losses	Loans and Allowance for Loan Losses Credit Quality of Loans Virtually all of our loans are from customers located in California, primarily in Marin, Alameda, Sonoma, San Francisco and Napa counties. Approximately 85% of total loans were secured by real estate at both December 31, 2016 and 2015 . At December 31, 2016 , 65% 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). The following table shows outstanding loans by class and payment aging as of December 31, 2016 and 2015 . Loan Aging Analysis by Class (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, 2016 30-59 days past due $ 283 $ — $ — $ — $ 77 $ — $ 2 $ 362 60-89 days past due — — — — — 49 49 90 days or more past due — — — — 91 — — 91 Total past due 283 — — — 168 — 51 502 Current 218,332 247,713 724,228 74,809 117,039 78,549 25,444 1,486,114 Total loans 3 $ 218,615 $ 247,713 $ 724,228 $ 74,809 $ 117,207 $ 78,549 $ 25,495 $ 1,486,616 Non-accrual loans 2 $ — $ — $ — $ — $ 91 $ — $ 54 $ 145 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 1 Our residential loan portfolio does not include sub-prime loans, nor is it our 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 There were no purchased credit impaired ("PCI") loans that had stopped accreting interest at December 31, 2016 . Amounts include $1 thousand of PCI loans that had stopped accreting interest at December 31, 2015 . Amounts exclude accreting PCI loans of $2.9 million and $3.7 million at December 31, 2016 and 2015 , 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, 2016 or 2015 . 3 Amounts include net deferred loan origination costs of $883 thousand and $768 thousand at December 31, 2016 and 2015 , respectively. Amounts are also net of unaccreted purchase discounts on non-PCI loans of $1.8 million and $3.2 million at December 31, 2016 and 2015 , 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 in anticipation of near-term development. 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 among loan types, 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, California. 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 and Watch : 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 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 worse, regardless of loan type, are reviewed no less than quarterly. The following table represents an analysis of the carrying amount in loans, net of deferred fees or costs and purchase premiums or discounts, by internally assigned risk grades, including PCI loans, at December 31, 2016 and 2015 . Credit Risk Profile by Internally Assigned Risk Grade (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 December 31, 2016 Pass $ 201,987 $ 234,849 $ 720,417 $ 71,564 $ 115,680 $ 78,549 $ 25,083 $ 2,920 $ 1,451,049 Special Mention 9,197 4,799 607 — 1,334 — — — 15,937 Substandard 7,391 6,993 1,498 3,245 91 — 412 — 19,630 Total loans $ 218,575 $ 246,641 $ 722,522 $ 74,809 $ 117,105 $ 78,549 $ 25,495 $ 2,920 $ 1,486,616 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 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. There we no loans removed from TDR designation during 2016. During 2015, five loans with a recorded investment totaling $1.6 million were removed from TDR designation, after meeting all of the conditions noted above. The table below summarizes the carrying amount of TDR loans by loan class as of December 31, 2016 and December 31, 2015 . 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, 2016 December 31, 2015 Commercial and industrial $ 2,207 $ 4,698 Commercial real estate, owner-occupied 6,993 6,993 Commercial real estate, investor 2,256 514 Construction 2 3,245 3,238 Home equity 625 460 Other residential 1,965 2,010 Installment and other consumer 877 1,168 Total $ 18,168 $ 19,081 1 There were no TDR loans on non-accrual status at December 31, 2016 and $72 thousand in TDR loans on non-accrual status as of December 31, 2015 . Includes no acquired loans as of December 31, 2016 and $137 thousand in acquired loans at December 31, 2015 . 2 In 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 2015 for no additional 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 TDRs modified during 2016: Commercial real estate, investor 2 $ 1,830 $ 1,826 $ 1,752 Home equity 1 1 $ 87 $ 222 $ 245 Installment and other consumer 1 $ 68 $ 67 $ 66 Total 4 $ 1,985 $ 2,115 $ 2,063 1 The home equity line of credit modified in 2016 included debt consolidation, which increased the post-modification balance. TDRs modified during 2015: Commercial and industrial 7 $ 3,271 $ 3,251 $ 2,811 TDRs modified during 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 Modifications during 2016 , 2015 and 2014 primarily involved maturity or payment extensions and interest rate concessions or some combination thereof. During 2016 , 2015 and 2014 , 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 Loans The table below summarizes information by class 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, 2016 Recorded investment in impaired loans: With no specific allowance recorded $ 315 $ — $ — $ 2,692 $ 91 $ 1,008 $ 103 $ 4,209 With a specific allowance recorded 1,892 6,993 2,256 553 624 957 829 14,104 Total recorded investment in impaired loans $ 2,207 $ 6,993 $ 2,256 $ 3,245 $ 715 $ 1,965 $ 932 $ 18,313 Unpaid principal balance of impaired loans $ 2,177 $ 6,993 $ 2,252 $ 3,238 $ 713 $ 1,965 $ 932 $ 18,270 Specific allowance $ 285 $ 163 $ 375 $ 8 $ 7 $ 55 $ 98 $ 991 Average recorded investment in impaired loans during 2016 $ 3,514 $ 7,069 $ 2,950 $ 3,242 $ 945 $ 1,988 $ 1,127 $ 20,835 Interest income recognized on impaired loans during 2016 1 $ 175 $ 199 $ 1,514 $ 137 $ 60 $ 90 $ 48 $ 2,223 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 $ 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 1 $ 238 $ 295 $ 33 $ 86 $ 18 $ 92 $ 64 $ 826 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 1 $ 378 $ 288 $ 28 $ 85 $ 19 $ 74 $ 76 $ 948 1 Interest income recognized on a cash basis totaled $1.4 million in 2016 and was primarily related to the interest recovery upon the pay-off of a partially charged off non-accrual commercial real estate loan during the third quarter. No interest interest income on impaired loans was recognized on a cash basis in 2015 and 2014. Management monitors delinquent loans continuously and identifies problem loans, generally loans graded substandard or worse, loans on non-accrual status and loans modified in a TDR, 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. There were no charged-off portions of impaired loans outstanding at December 31, 2016 . The charged-off portion of impaired loans outstanding at December 31, 2015 totaled approximately $2.1 million . In addition, the recorded investment in impaired loans is net of purchase discounts or premiums on acquired loans and net deferred fees and cost. At December 31, 2016 and 2015 , outstanding commitments to extend credit on impaired loans, including performing loans to borrowers whose terms have been modified in TDRs, totaled $1.6 million and $1.3 million , respectively. The following tables disclose activity in the ALLL and the recorded investment in loans by class, as well as the related ALLL disaggregated by impairment evaluation method. 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, 2016 Beginning balance $ 3,023 $ 2,249 $ 6,178 $ 724 $ 910 $ 394 $ 425 $ 1,096 $ 14,999 Provision (reversal) 93 (476 ) (2,014 ) 57 60 60 (75 ) 445 (1,850 ) Charge-offs (11 ) (20 ) — — — — (5 ) — (36 ) Recoveries 143 — 2,156 — 3 — 27 — 2,329 Ending balance $ 3,248 $ 1,753 $ 6,320 $ 781 $ 973 $ 454 $ 372 $ 1,541 $ 15,442 Year ended December 31, 2015 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 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 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 December 31, 2016 Ending ALLL related to loans collectively evaluated for impairment $ 2,963 $ 1,590 $ 5,945 $ 773 $ 966 $ 399 $ 274 $ 1,541 $ 14,451 Ending ALLL related to loans individually evaluated for impairment 285 163 375 8 7 55 98 — 991 Ending ALLL related to purchased credit-impaired loans — — — — — — — — — Ending balance $ 3,248 $ 1,753 $ 6,320 $ 781 $ 973 $ 454 $ 372 $ 1,541 $ 15,442 Recorded Investment: Collectively evaluated for impairment $ 216,368 $ 239,648 $ 720,266 $ 71,564 $ 116,390 $ 76,584 $ 24,563 $ — $ 1,465,383 Individually evaluated for impairment 2,207 6,993 2,256 3,245 715 1,965 932 — 18,313 Purchased credit-impaired 40 1,072 1,706 — 102 — — — 2,920 Total $ 218,615 $ 247,713 $ 724,228 $ 74,809 $ 117,207 $ 78,549 $ 25,495 $ — $ 1,486,616 Ratio of allowance for loan losses to total loans 1.49 % 0.71 % 0.87 % 1.04 % 0.83 % 0.58 % 1.46 % NM 1.04 % Allowance for loan losses to non-accrual loans NM NM NM NM 1,071 % NM 683 % NM 10,650 % 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 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 Totals exclude $138 thousand in 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 Purchased Credit-Impaired Loans 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 bank 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. The following table reflects the unpaid principal balance and related carrying value of PCI loans: PCI Loans December 31, 2016 December 31, 2015 (in thousands) Unpaid Principal Balance Carrying Value Unpaid Principal Balance Carrying Value Commercial and industrial $ 45 $ 40 $ 237 $ 175 Commercial real estate, owner occupied 1,344 1,072 2,573 1,711 Commercial real estate, investor 1,713 1,706 1,756 1,726 Construction — — 187 1 Home equity 248 102 224 68 Total purchased credit-impaired loans $ 3,350 $ 2,920 $ 4,977 $ 3,681 There were no fluctuations in expected future cash flows on the remaining PCI loans that resulted in changes to the allowance for loan losses during 2016. The specific allowance for PCI loan losses increased by $4 thousand and $3 thousand during 2015 and 2014 , 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. The specific allowance for PCI loan losses decreased by $6 thousand during 2016 as a result of loan pay-offs. The allowance for loan losses for PCI loans, due to increases in the present value of cash flows expected to be collected, decreased by $2 thousand and $238 thousand during 2015 and 2014, respectively. The activities in the accretable yield, or income expected to be earned over the remaining lives of the PCI loans were as follows: Accretable Yield Years ended (in thousands) December 31, 2016 December 31, 2015 December 31, 2014 Balance at beginning of period $ 2,618 $ 4,027 $ 3,649 Additions — — — Removals 1 (778 ) (914 ) (273 ) Accretion (364 ) (495 ) (613 ) Reclassifications from nonaccretable difference 2 — — 1,264 Balance at end of period $ 1,476 $ 2,618 $ 4,027 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 $869.2 million and $833.8 million at December 31, 2016 and 2015 , respectively. In addition, we pledge a certain residential loan portfolio, which totaled $54.6 million and $45.2 million at December 31, 2016 and 2015 , respectively, to secure our borrowing capacity with the Federal Reserve Bank ( “ FRB ” ). Also see Note 7, Borrowings, 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, 2016 , 2015 and 2014 is as follows: (in thousands) 2016 2015 2014 Balance at beginning of year $ 2,562 $ 3,329 $ 3,749 Additions — — — Advances — 165 — Repayments (574 ) (390 ) (420 ) Reclassified as unrelated-party loan due to a change in borrower status — (542 ) — Balance at end of year $ 1,988 $ 2,562 $ 3,329 Undisbursed commitments to related parties totaled $1.1 million and $1.0 million as of December 31, 2016 and 2015 , respectively.

Bank Premises and Equipment

Bank Premises and Equipment	12 Months Ended
	Dec. 31, 2016
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) 2016 2015 Leasehold improvements $ 13,883 $ 13,615 Furniture and equipment 10,627 9,887 Subtotal 24,510 23,502 Accumulated depreciation and amortization (15,990 ) (14,197 ) Bank premises and equipment, net $ 8,520 $ 9,305 The amount of depreciation and amortization totaled $1.8 million , $2.0 million , and $1.6 million for the years ended December 31, 2016 , 2015 and 2014 , respectively.

Bank Owned Life Insurance

Bank Owned Life Insurance	12 Months Ended
	Dec. 31, 2016
Insurance [Abstract]
Bank Owned Life Insurance	Bank Owned Life Insurance We own life insurance policies on the lives of certain officers designated by the Board of Directors to finance employee benefit programs, and death benefits provided under the specific terms of these programs are estimated to be $71.0 million at December 31, 2016 . 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 $32.4 million and $29.5 million at December 31, 2016 and 2015 , 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 $844 thousand , $814 thousand and $841 thousand was recognized on the life insurance policies in 2016 , 2015 and 2014 , respectively. 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, 2016
Banking and Thrift [Abstract]
Deposits	Deposits A stratification of time deposits at December 31, 2016 and 2015 is presented in the following table: (in thousands) December 31, 2016 December 31, 2015 Time deposits of less than $100 thousand $ 36,346 $ 39,534 Time deposits of $100 thousand to $250 thousand 66,092 67,352 Time deposits of more than $250 thousand 49,025 54,571 Total time deposits $ 151,463 $ 161,457 Interest on time deposits was $743 thousand , $853 thousand and $917 thousand in 2016 , 2015 and 2014 , respectively. Scheduled maturities of time deposits at December 31, 2016 are presented as follows: (in thousands) 2017 2018 2019 2020 2021 Thereafter Total Scheduled maturities of time deposits $ 104,616 $ 12,325 $ 7,891 $ 7,246 $ 19,385 $ — $ 151,463 As of December 31, 2016 , $36.4 million in securities held-to-maturity and $71.9 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. In addition, in 2016, we began offering deposits through Reich & Tang Deposit Networks, LLC, comprised of Demand Deposit Marketplace SM ("DDM") balances, mostly in money market deposits. Through these two networks 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, ICS and DDM, 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 had $15.1 million and $14.3 million in CDARS and $29.0 million and $12.2 million in ICS balances in the reciprocal deposit program at December 31, 2016 and 2015 , respectively. In addition, we had $36.4 million in DDM balances in the reciprocal deposit program at December 31, 2016. We also have the ability to place deposits through the networks for which we receive no matching deposits ("one-way" deposits). One-way CDARS deposits totaled $361 thousand and $355 thousand at December 31, 2016 and 2015 , respectively. The aggregate amount of deposit overdrafts that have been reclassified as loan balances was $229 thousand and $84 thousand at December 31, 2016 and 2015 , 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 $7.3 million and $8.3 million at December 31, 2016 and 2015 , respectively.

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2016
Debt Disclosure [Abstract]
Borrowings	Borrowings Federal Funds Purchased – The Bank had unsecured lines of credit totaling $92.0 million with correspondent banks for overnight borrowings at both December 31, 2016 and 2015 . In general, interest rates on these lines approximate the federal funds target rate. We had no overnight borrowings under these credit facilities at December 31, 2016 and December 31, 2015 . Federal Home Loan Bank Borrowings – As of December 31, 2016 and 2015 , the Bank had lines of credit with the FHLB totaling $513.7 million and $470.6 million , respectively, based on eligible collateral of certain loans. At December 31, 2016 there were no FHLB overnight borrowings compared to $52.0 million in FHLB overnight borrowings at a rate of 0.27% at December 31, 2015 . On February 5, 2008, the Bank 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% . On June 15, 2016, the Bank repaid the $15.0 million early and incurred a prepayment fee of $312 thousand recorded in interest expense. At December 31, 2016 and 2015 , $513.7 million and $403.4 million , respectively, were remaining as available for borrowing from the FHLB, net of outstanding borrowings and an unused standby letter of credit totaling $241 thousand at December 31, 2015. Federal Reserve Line of Credit – The Bank has a line of credit with the Federal Reserve Bank of San Francisco ("FRBSF") secured by certain residential loans. At December 31, 2016 and 2015 , the Bank had borrowing capacity under this line totaling $43.1 million and $37.8 million , respectively, and had no outstanding borrowings with the FRBSF. As part of an 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 $191 thousand , $210 thousand and $216 thousand in 2016 , 2015 and 2014 , 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, 2016 : (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 (3.93% as of December 31, 2016), 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 (2.36% as of December 31, 2016), redeemable, in whole or in part, on any interest payment date 4,124 Total $ 8,248 Borrowings at December 31, 2016 and 2015 are summarized as follows: 2016 2015 (dollars in thousands) Carrying Value Average Balance Average Rate Carrying Value Average Balance Average Rate FHLB overnight borrowings $ — $ 5,383 0.42 % $ 52,000 $ 784 0.38 % FHLB fixed-rate advances $ — $ 6,803 6.59 % 1 $ 15,000 $ 15,000 2.07 % Subordinated debentures $ 5,586 $ 5,493 7.80 % $ 5,395 $ 5,288 7.94 % 1 Amount includes the impact of the $312 thousand prepayment fee in 2016 discussed above.

Stockholders' Equity and Stock

Stockholders' Equity and Stock Plans	12 Months Ended
	Dec. 31, 2016
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 was subsequently auctioned to two institutional investors in November 2011. The warrant, as adjusted, represented the right to purchase 157,711 shares of common stock at $26.63 per share when it was exercised in September 2015 and the cashless exercise resulted in the issuance of 70,591 shares of common stock. 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 2016 , 2015 and 2014 , our directors were awarded a total of 4,607 , 5,295 and 5,306 common shares, respectively, from the 2010 Director Stock Plan in addition to their cash compensation. As of December 31, 2016 , 113,842 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, 2016 , there were 155,750 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 192,965 shares available for future grants under the plan as of December 31, 2016 . 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 and restricted stock awarded to officers and employees during 2006 through 2014 vest 20% on each anniversary of the grant date for five years and expire ten years from the grant date. Options granted to non-employee directors prior to 2016 vest 20% immediately and 20% on each anniversary of the grant date for four years and expire seven years from the grant date. All options granted after 2014 for employees and in 2016 for non-employee directors generally vest by one-third on each anniversary of the grant for three years and expire ten 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, 2016 , 2015 and 2014 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. Number of Shares Weighted Average Exercise Price Aggregate Intrinsic Value (in thousands) Weighted Average Grant-Date Fair Value Weighted Average Remaining Contractual Term (in years) 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 Options outstanding at December 31, 2015 185,269 38.35 2,788 5.00 Granted 32,637 49.37 10.11 Exercised (36,117 ) 33.98 661 Options outstanding at December 31, 2016 181,789 41.20 5,190 5.77 Exercisable (vested) at December 31, 2016 103,211 36.65 3,416 4.18 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, 2016 . Number of options 177,122 Weighted average exercise price $ 41.03 Aggregate intrinsic value (in thousands) $ 5,086 Weighted average remaining contractual term (in years) 5.71 The following table summarizes non-vested restricted stock awards and changes during the years ended December 31, 2016 , 2015 and 2014 . Restricted Stock Awards Number of Shares Weighted Average Grant-Date Fair Value 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 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 Granted 16,910 49.65 Vested (8,599 ) 44.14 Non-vested awards at December 31, 2016 39,699 48.15 As of December 31, 2016 , there was $1.6 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 1.8 years. The total grant-date fair value of stock options vested during the years ended December 31, 2016 , 2015 and 2014 was $282 thousand , $202 thousand and $187 thousand , respectively. The total grant-date fair value of restricted stock awards vested during 2016 , 2015 and 2014 was $380 thousand , $262 thousand and $227 thousand , respectively. A summary of the options outstanding and exercisable by price range as of December 31, 2016 is presented in the following table: Stock Options Outstanding as of December 31, 2016 Stock Options Exercisable as of December 31, 2016 Range of Exercise Prices Stock Options Outstanding Remaining Contractual Life (in years) Weighted Average Exercise Price Stock Options Exercisable Weighted Average Exercise Price $20.00 - $25.00 13,138 2.3 $ 22.25 13,138 $ 22.25 $25.01 - $30.00 10,180 1.3 28.75 10,180 28.75 $30.01 - $35.00 9,195 3.3 33.10 9,195 33.10 $35.01 - $40.00 46,588 4.1 37.70 39,038 37.48 $40.01 - $45.00 29,551 5.9 41.95 17,130 41.91 $45.01 - $50.00 45,187 8.7 48.40 5,020 45.88 $50.01 - $55.00 27,950 7.9 50.70 9,510 50.69 181,789 103,211 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. Total compensation cost for these share-based payment arrangements was $994 thousand , $636 thousand and $446 thousand during 2016 , 2015 and 2014 , respectively, and the total recognized tax benefits related thereto were $318 thousand , $194 thousand and $128 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 2016 , 2015 and 2014 was $70 thousand , $49 thousand and $76 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, and the following assumptions (weighted-average shown). Years ended December 31, 2016 2015 2014 Risk-free interest rate 1.37 % 1.67 % 2.04 % Expected dividend yield on common stock 2.02 % 1.75 % 1.70 % Expected life in years 6.0 6.0 6.0 Expected price volatility 25.56 % 28.06 % 30.32 % Dividends Presented below is a summary of cash dividends paid to common shareholders, recorded as a reduction of retained earnings. On January 20, 2017, the Board of Directors declared a cash dividend of $0.27 per share, payable on February 10, 2017 to shareholders of record at the close of business on February 3, 2017. Years ended December 31, (in thousands except per share data) 2016 2015 2014 Cash dividends to common stockholders $ 6,223 $ 5,390 $ 4,733 Cash dividends per common share $ 1.02 $ 0.90 $ 0.80 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 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, payment of dividends by Bancorp to its shareholders 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, 2016 , Bancorp's retained earnings and the amount of assets that exceeds the total liabilities were $146.5 million and $230.6 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 $50.8 million of the Bank's retained earnings balance was available for payment of dividends to Bancorp as of December 31, 2016 . Bancorp held $3.5 million in cash at December 31, 2016 . This cash, combined with the $50.8 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 2017. 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. The Rights Agreement was amended on June 17, 2016 to reduce the percentage of share ownership defining an "acquiring person" and certain related terms from 15% to 10% of the outstanding common shares. As of December 31, 2016 , Bancorp was 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, 2016
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, 2016 Securities available for sale: Mortgage-backed securities and collaterized mortgage obligations issued by U.S. government agencies $ 254,041 $ — $ 253,434 $ 607 Debentures of government sponsored agencies $ 35,403 $ — $ 35,403 $ — Privately-issued collateralized mortgage obligations $ 419 $ — $ 419 $ — Obligations of state and political subdivisions $ 77,701 $ — $ 77,701 $ — Corporate bonds $ 5,016 $ — $ 5,016 $ — Derivative financial assets (interest rate contracts) $ 55 $ — $ 55 $ — Derivative financial liabilities (interest rate contracts) $ 933 $ — $ 933 $ — December 31, 2015 Securities available for sale: Mortgage-backed securities and collaterized mortgage obligations issued by U.S. government 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 $ — 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, privately-issued collateralized mortgage obligations and corporate bonds. As of December 31, 2016 and 2015 , there were no securities that were considered Level 1 securities. As of December 31, 2016 , we have one available-for-sale security that is considered a Level 3 security. The security is a U.S. government agency obligation collateralized by a small number of business equipment loans guaranteed by the Small Business Administration ("SBA") program. This security is not actively traded and is owned only by a few investors. The significant unobservable data that is reflected in the fair value measurement include dealer quotes, projected prepayment speeds/average life and credit information, among other things. The decrease in fair value during 2016 was due to the pay-off of one of the larger loans in the pool collateralizing the security. The unrealized gain or loss on this SBA-guaranteed security decreased by $15 thousand in the same period recorded as part of other comprehensive income. 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, and we did not record any write-downs during 2016 or 2015. 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 risk in determining the fair value of the 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 whether the swap positions are fully collateralized 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 the Bank. For further discussion on our methodology in valuing our derivative financial instruments, refer to Note 14, Derivative Financial Instruments and Hedging Activities. 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 assets and liabilities measured at fair value on a non-recurring basis and that were held in the consolidated statements of condition at each respective period end, by level within the fair value hierarchy as of December 31, 2016 and 2015 . (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, 2016 Other real estate $ 408 $ — $ — $ 408 December 31, 2015 Other real estate $ 421 $ — $ — $ 421 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 property characteristics, leasing status and physical condition. When appraisals are received, Management reviews the underlying assumptions and methodology utilized, 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 the underlying collateral. There have been no significant changes in the valuation techniques during 2016. 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. All OREO resulted from an acquisition. Decreases in the estimated fair value of OREO totaled $13 thousand and $40 thousand during 2016 and 2015, respectively. Disclosures about Fair Value of Financial Instruments The table below is a summary of fair value estimates for financial instruments as of December 31, 2016 and 2015 , 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. Further, 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 BOLI. Additionally, we hold shares of FHLB stock and Visa Inc. Class B common stock at cost. These shares are restricted from resale and their values were discussed in Note 2, Investment Securities, above. December 31, 2016 December 31, 2015 (in thousands) Carrying Amounts Fair Value Fair Value Hierarchy Carrying Amounts Fair Value Fair Value Hierarchy Financial assets: Cash and cash equivalents $ 48,804 $ 48,804 Level 1 $ 26,343 $ 26,343 Level 1 Investment securities held-to-maturity 44,438 45,097 Level 2 69,637 71,054 Level 2 Loans, net 1,471,174 1,473,360 Level 3 1,436,229 1,470,380 Level 3 Interest receivable 6,319 6,319 Level 2 6,643 6,643 Level 2 Financial liabilities: Deposits 1,772,700 1,773,102 Level 2 1,728,226 1,728,717 Level 2 Federal Home Loan Bank borrowing — — Level 2 67,000 67,279 Level 2 Subordinated debentures 5,586 5,083 Level 3 5,395 5,132 Level 3 Interest payable 134 134 Level 2 187 187 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, 2016 and 2015 , we did not hold any held-to-maturity 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 creditworthiness 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 term of our fixed-rate credit advances. Subordinated Debentures - The fair values of the subordinated debentures were estimated by discounting the future cash flows (interest payment at a rate of three-month LIBOR plus 3.05% and 1.40% ) 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 interest payment was discounted at the 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 issuances and led to the absence of observable or comparable transactions in the market place. Due to the use of unobservable inputs of trust preferred securities, we consider the fair value to be a Level 3 measurement. See Note 7, Borrowings for further information. 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, 2016 and 2015 , respectively.

Benefit Plans

Benefit Plans	12 Months Ended
	Dec. 31, 2016
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 was 3.5% on January 1, 2016, and 3.25% on both January 1, 2015 and 2014. Our deferred compensation obligation totaled $3.2 million and $3.0 million at December 31, 2016 and 2015 , 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 $589 thousand , $555 thousand and $548 thousand for the years ended December 31, 2016 , 2015 and 2014 , 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 employer contributions vest immediately. The Bank of Marin 401(k) Plan was amended in early 2016 to incorporate recent changes in the pension laws, and was amended again in November 2016 to include a Roth 401(k) option. The Bank contributed cash in the amount of $1.2 million , $1.1 million and $1.2 million in 2016 , 2015 and 2014 , respectively, to the ESOP, which purchased Bancorp stock at market prices. 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. At December 31, 2016 and 2015 , respectively, our liability under the Salary Continuation Plan was $1.0 million and $823 thousand recorded in interest payable and other liabilities.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2016
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) 2016 2015 2014 Current tax provision Federal $ 9,710 $ 7,097 $ 8,523 State 3,794 2,931 3,195 Total current 13,504 10,028 11,718 Deferred tax provision (benefit) Federal (206 ) 382 (146 ) State 48 80 126 Total deferred (158 ) 462 (20 ) Total income tax provision $ 13,346 $ 10,490 $ 11,698 The following table shows the tax effect of our cumulative temporary differences as of December 31: (in thousands) 2016 2015 Deferred tax assets: Allowance for loan losses and off-balance sheet credit commitments $ 6,871 $ 5,918 Net operating loss carryforwards 3,582 4,090 Net unrealized loss on securities available-for-sale 2,543 59 Deferred compensation plan and salary continuation plan 1,773 1,619 State franchise tax 1,300 1,005 Accrued but unpaid expenses 1,251 1,188 Fair value adjustment on acquired loans 799 1,197 Deferred rent and other lease incentives 547 595 Depreciation and disposals on premises and equipment 528 231 Other real estate owned 448 448 Stock-based compensation 398 273 Interest received on non-accrual loans 185 864 Other 196 381 Total gross deferred tax assets 20,421 17,868 Deferred tax liabilities: Deferred loan origination costs and fees (2,784 ) (2,567 ) Unaccreted discount on subordinated debentures (1,119 ) (1,200 ) Core deposit intangible asset (1,085 ) (1,309 ) Accretion on investment securities (54 ) (55 ) Other (42 ) (42 ) Total gross deferred tax liabilities (5,084 ) (5,173 ) Net deferred tax assets $ 15,337 $ 12,695 As of December 31, 2016 , federal and California net operating loss carryforwards ("NOLs") of $6.3 million and $19.3 million , respectively, corresponded to the total $3.6 million deferred tax asset above. If not fully utilized, the federal NOLs will begin to expire in 2029, and the California NOLs will begin to expire in 2028. 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 valuation allowance has been established as of December 31, 2016 or 2015 . The effective tax rate for 2016 , 2015 and 2014 differs from the current federal statutory income tax rate as follows: 2016 2015 2014 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 % 6.8 % Tax exempt interest on municipal securities and loans (4.0 )% (4.2 )% (3.3 )% Tax exempt earnings on bank owned life insurance (0.8 )% (1.0 )% (0.9 )% Low income housing and qualified zone academy bond tax credits (0.3 )% (0.2 )% (0.1 )% Other (0.1 )% (0.1 )% (0.3 )% Effective Tax Rate 36.6 % 36.3 % 37.2 % 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. We are no longer subject to examinations by tax authorities for years before 2013 for federal income tax and before 2012 for California. At December 31, 2016 and 2015, there were no unrecognized tax benefits, and 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, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies We rent certain premises under long-term, non-cancelable operating leases expiring at various dates through the year 2032. Most of the leases contain certain renewal options and escalation clauses. At December 31, 2016 , the approximate minimum future commitments payable under non-cancelable contracts for leased premises are as follows: (in thousands) 2017 2018 2019 2020 2021 Thereafter Total Operating leases 1 $ 3,850 $ 3,919 $ 3,725 $ 3,405 $ 2,114 $ 4,069 $ 21,082 1 Minimum payments have not been reduced by minimum sublease rentals of $151 thousand due in the future under non-cancelable subleases. Rent expense included in occupancy expense totaled $3.9 million in 2016 and $4.2 million in 2015 and 2014 , respectively. Litigation Matters 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 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 2016. At December 31, 2016 , according to the latest SEC Form 10-Q filed by Visa, Inc. on February 2, 2017, the balance of the escrow account was $1.0 billion . Visa had reached a $4.0 billion interchange multidistrict litigation class settlement agreement. However, a number of objectors have appealed and on June 30, 2016, an appellate court reversed the approval of the settlement by the lower court. Until the appeal process is complete, Visa is uncertain whether it will resolve the claims as contemplated by the settlement agreement and additional lawsuits may arise. The conversion rate of Visa Class B common stock held by us to Class A common stock (as discussed in Note 2, Investment Securities) 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.

Concentrations of Credit Risk

Concentrations of Credit Risk	12 Months Ended
	Dec. 31, 2016
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 according to regulations. Concentrations of credit risk with respect to investment securities are limited to the U.S. Government, its agencies and Government Sponsored Enterprises ("GSEs") and was $299.5 million , or 72% of our total investment portfolio at December 31, 2016 and $362.6 million , or 74.4% at December 31, 2015 . 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 79% and 80% of our loan portfolio at December 31, 2016 and 2015 , respectively.

Derivative Financial Instrument

Derivative Financial Instruments and Hedging Activities	12 Months Ended
	Dec. 31, 2016
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. Our credit exposure, if any, on interest rate swap asset positions is limited to the fair 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, 2016 , we had five interest rate swap agreements, which are scheduled to mature in June 2031, October 2031, July 2032, August 2037 and October 2037. All of our derivatives are accounted for as fair value hedges. The notional amounts of the interest rate contracts are equal to the notional amounts of the hedged loans. In September 2016 and April 2016, respectively, one interest rate swap scheduled to mature in August 2020 and another one scheduled to mature in June 2020 were terminated as the hedged loans were paid off. In both cases, prepayment fees were collected from the borrowers to settle the interest rate swap liability, resulting in no net gain or loss on the terminations of the swaps and loan pay-offs. Our interest rate swap payments are settled monthly with counterparties. Accrued interest on the swaps totaled $13 thousand and $28 thousand as of December 31, 2016 and 2015 , respectively. Information on our derivatives follows: Asset derivatives Liability derivatives (in thousands) December 31, 2016 December 31, 2015 December 31, 2016 December 31, 2015 Fair value hedges: Interest rate contracts notional amount $ 4,217 $ 4,407 $ 15,495 $ 22,187 Interest rate contracts fair value 1 $ 55 $ 3 $ 933 $ 1,658 Years ended December 31, (in thousands) 2016 2015 2014 Increase (decrease) in value of designated interest rate swaps due to LIBOR interest rate movements recognized in interest income $ 778 $ 280 $ (377 ) Payment on interest rate swaps recorded in interest income (556 ) (918 ) (1,002 ) (Decrease) increase in value of hedged loans recognized in interest income (571 ) (308 ) 662 Decrease in value of yield maintenance agreement recognized against interest income (94 ) (52 ) (91 ) Net loss on derivatives recognized against interest income 2 $ (443 ) $ (998 ) $ (808 ) 1 See Note 9, Fair Value of Assets and Liabilities for valuation methodology. 2 Includes hedge ineffectiveness gain of $113 thousand , loss of $80 thousand and gain of $194 thousand for the years December 31, 2016 , 2015 and 2014 , 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 exactly offset the change in the fair value of the hedged items from period to period. 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 December 31, 2016 Derivatives by Counterparty: Counterparty A $ 55 $ 55 $ (55 ) $ — Total $ 55 $ — $ 55 $ (55 ) $ — $ — December 31, 2015 Derivatives by Counterparty: Counterparty A $ 3 $ — $ 3 $ (3 ) $ — $ — Total $ 3 $ — $ 3 $ (3 ) $ — $ — 1 Amounts exclude accrued interest totaling $1 thousand at both December 31, 2016 and December 31, 2015 , 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 December 31, 2016 Derivatives by Counterparty: Counterparty A $ 933 $ 933 $ (55 ) (878 ) $ — Total $ 933 $ — $ 933 $ (55 ) $ (878 ) $ — 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 ) $ — 2 Amounts exclude accrued interest totaling $12 thousand and $27 thousand at December 31, 2016 and December 31, 2015 , respectively.

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2016
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 as set forth in the tables below 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. 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 to be considered a well capitalized bank holding company. In addition, 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, 2016. 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 for prompt corrective action 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 fully phased-in by January 2019. The guidelines, among other things, changed the minimum capital requirements of banks and bank holding companies, by increasing the Tier 1 capital to risk-weighted assets ratio to 6% , and introduced 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. The Bancorp’s and Bank's capital adequacy ratios as of December 31, 2016 and 2015 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 build capital in 2016 through the accumulation of net income. Capital Ratios for Bancorp (dollars in thousands) Actual Ratio Adequately Capitalized Threshold 1 Ratio to be a Well Capitalized Bank Holding Company December 31, 2016 Amount Ratio Amount Ratio Amount Ratio Total Capital (to risk-weighted assets) $ 247,453 14.32 % ≥ $ 149,039 ≥ 8.625 % ≥ $ 172,799 ≥ 10.000 % Tier 1 Capital (to risk-weighted assets) $ 231,111 13.37 % ≥ $ 114,479 ≥ 6.625 % ≥ $ 138,239 ≥ 8.000 % Tier 1 Capital (to average assets) $ 231,111 11.39 % ≥ $ 81,189 ≥ 4.000 % ≥ $ 101,486 ≥ 5.000 % Common Equity Tier 1 (to risk-weighted assets) $ 225,925 13.07 % ≥ $ 88,559 ≥ 5.125 % ≥ $ 112,319 ≥ 6.500 % December 31, 2015 Total Capital (to risk-weighted assets) $ 227,269 13.37 % ≥ $ 135,996 ≥ 8.000 % ≥ $ 169,995 ≥ 10.000 % Tier 1 Capital (to risk-weighted assets) $ 211,521 12.44 % ≥ $ 101,997 ≥ 6.000 % ≥ $ 135,996 ≥ 8.000 % Tier 1 Capital (to average assets) $ 211,521 10.67 % ≥ $ 79,296 ≥ 4.000 % ≥ $ 99,120 ≥ 5.000 % Common Equity Tier 1 (to risk-weighted assets) $ 206,724 12.16 % ≥ $ 76,498 ≥ 4.500 % ≥ $ 110,497 ≥ 6.500 % 1 The 2016 adequately capitalized threshold includes the capital conservation buffer that was effective January 1, 2016. These ratios are not reflected on a fully phased-in basis, which will occur in January 2019. Capital Ratios for the Bank (dollars in thousands) Actual Ratio Adequately Capitalized Threshold 1 Ratio to be Well Capitalized under Prompt Corrective Action Provisions December 31, 2016 Amount Ratio Amount Ratio Amount Ratio Total Capital (to risk-weighted assets) $ 243,468 14.09 % ≥ $ 149,016 ≥ 8.625 % ≥ $ 172,772 ≥ 10.000 % Tier 1 Capital (to risk-weighted assets) $ 227,127 13.15 % ≥ $ 114,462 ≥ 6.625 % ≥ $ 138,218 ≥ 8.000 % Tier 1 Capital (to average assets) $ 227,127 11.19 % ≥ $ 81,176 ≥ 4.000 % ≥ $ 101,469 ≥ 5.000 % Common Equity Tier 1 (to risk-weighted assets) $ 227,127 13.15 % ≥ $ 88,546 ≥ 5.125 % ≥ $ 112,302 ≥ 6.500 % December 31, 2015 Total Capital (to risk-weighted assets) $ 222,830 13.11 % ≥ $ 135,968 ≥ 8.000 % ≥ $ 169,960 ≥ 10.000 % Tier 1 Capital (to risk-weighted assets) $ 207,082 12.18 % ≥ $ 101,976 ≥ 6.000 % ≥ $ 135,968 ≥ 8.000 % Tier 1 Capital (to average assets) $ 207,082 10.45 % ≥ $ 79,268 ≥ 4.000 % ≥ $ 99,085 ≥ 5.000 % Common Equity Tier 1 (to risk-weighted assets) $ 207,082 12.18 % ≥ $ 76,482 ≥ 4.500 % ≥ $ 110,474 ≥ 6.500 % 1 The 2016 adequately capitalized threshold includes the capital conservation buffer that was effective January 1, 2016. These ratios are not reflected on a fully phased-in basis, which will occur in January 2019.

Financial Instruments with Off-

Financial Instruments with Off-Balance Sheet Risk	12 Months Ended
	Dec. 31, 2016
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. Because various commitments will 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 underwriting criteria for all credit exposure. The amount of collateral obtained, if deemed necessary by us, is based on Management's credit evaluation of the borrower. Collateral types pledged may include accounts receivable, inventory, other personal property and real property. The contractual amount of undrawn loan commitments and standby letters of credit not reflected on the consolidated statements of condition are as follows: (in thousands) December 31, 2016 December 31, 2015 Commercial lines of credit $ 216,774 $ 191,305 Revolving home equity lines 148,143 130,359 Undisbursed construction loans 44,798 39,442 Personal and other lines of credit 10,635 11,112 Standby letters of credit 1,939 4,381 Total commitments and standby letters of credit $ 422,289 $ 376,599 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. We set aside an allowance for losses on off-balance sheet commitments in the amount of $899 thousand and $749 thousand as of December 31, 2016 and 2015 , respectively, which is recorded in interest payable and other liabilities on the consolidated statements of condition. The increase in the reserve for off-balance sheet commitments in 2016 was primarily due to an increase in commitments and a decrease in average utilization. Approximately 42% of the commitments expire in 2017, approximately 42% expire between 2018 and 2024 and approximately 16% expire thereafter.

Condensed Bank of Marin Bancorp

Condensed Bank of Marin Bancorp Parent Only Financial Statements	12 Months Ended
	Dec. 31, 2016
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, 2016 and 2015 (in thousands) 2016 2015 Assets Cash and due from Bank of Marin $ 3,568 $ 3,796 Investment in bank subsidiary 232,431 215,722 Other assets 670 770 Total assets $ 236,669 $ 220,288 Liabilities and Stockholders' Equity Subordinated debentures $ 5,586 $ 5,395 Accrued expenses payable 96 109 Other liabilities 424 311 Total liabilities 6,106 5,815 Stockholders' equity 230,563 214,473 Total liabilities and stockholders' equity $ 236,669 $ 220,288 CONDENSED UNCONSOLIDATED STATEMENTS OF INCOME Years ended December 31, 2016, 2015 and 2014 (in thousands) 2016 2015 2014 Income Dividends from bank subsidiary $ 6,400 $ 6,500 $ — Miscellaneous Income 7 6 8 Total income 6,407 6,506 8 Expense Interest expense 435 420 421 Non-interest expense 984 973 851 Total expense 1,419 1,393 1,272 Income (loss) before income taxes and equity in undistributed net income of subsidiary 4,988 5,113 (1,264 ) Income tax benefit 594 583 532 Income (loss) before equity in undistributed net income of subsidiary 5,582 5,696 (732 ) Earnings of bank subsidiary greater (less) than dividends received from bank subsidiary 17,552 12,745 20,503 Net income $ 23,134 $ 18,441 $ 19,771 CONDENSED UNCONSOLIDATED STATEMENTS OF CASH FLOWS Years ended December 31, 2016, 2015 and 2014 (in thousands) 2016 2015 2014 Cash Flows from Operating Activities: Net income $ 23,134 $ 18,441 $ 19,771 Adjustments to reconcile net income to net cash provided by (used in) operating activities: Earnings of bank subsidiary greater than dividends received from bank subsidiary (17,552 ) (12,745 ) (20,503 ) Net change in operating assets and liabilities: Accretion of discount on subordinated debentures 191 210 216 Other assets 353 (298 ) (88 ) Intercompany receivable 171 (18 ) — Other liabilities (302 ) 368 (99 ) Net cash provided by (used in) operating activities 5,995 5,958 (703 ) Cash Flows from Investing Activities: Capital contribution to subsidiary (1,285 ) (1,156 ) (1,475 ) Net cash used in investing activities (1,285 ) (1,156 ) (1,475 ) Cash Flows from Financing Activities: Stock options exercised and stock purchases 1,285 1,156 1,475 Dividends paid on common stock (6,223 ) (5,390 ) (4,733 ) Net cash used by financing activities (4,938 ) (4,234 ) (3,258 ) Net (decrease) increase in cash and cash equivalents (228 ) 568 (5,436 ) Cash and cash equivalents at beginning of period 3,796 3,228 8,664 Cash and cash equivalents at end of period $ 3,568 $ 3,796 $ 3,228 Supplemental schedule of non-cash investing and financing activities: Stock issued in payment of director fees $ 234 $ 275 $ 236 End of 2016 Audited Consolidated Financial Statements

Summary of Significant Accoun24

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2016
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, except for the transfer of certain investment securities from the available-for-sale category to held-to-maturity as discussed in Note 2, Investment Securities, herein. The NorCal Community Bancorp Trusts I and II, respectively (the "Trusts"), 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 (See Note 7, Borrowings). Bancorp's investment in the securities 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 9, Fair Value of Assets and Liabilities. 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 borrower has resumed paying the full amount of the principal and interest and we are satisfied with the borrower's financial position. In order to meet this test, we must have received repayment of all past due principal and interest unless the amounts contractually due are reasonably assured of repayment within a reasonable period of time, and there has been a sustained period of repayment performance (generally, six consecutive monthly payments), according to the original contractual terms or 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”). • The loan has become well secured and is in the process of collection. 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. Overdraft accounts are generally charged off when they exceed 60 days past due.
Acquired Loans	Acquired Loans : 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. 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 process of calculating fair values of acquired loans, including estimates of losses expected to be incurred over the estimated remaining lives of the loans at acquisition date and ongoing updates to Management's expectation of future cash flows, requires significant subjective judgments and assumptions. The economic environment and lack of market liquidity and transparency are factors that have influenced, and may continue to affect, these assumptions and estimates. We acquired loans 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 could not be reasonably estimated. The difference between the undiscounted expected cash flows expected to be collected and the fair value at acquisition date ("accretable difference") is accreted into interest income at a level yield of return over the estimated remaining life of the PCI loan, 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 financial conditions of the borrowers and the market conditions. Probable decreases in expected cash flows after acquisition result in impairment recorded as a specific allowance for loan losses or a charge-off to the allowance. Impairment is calculated as the present value of the expected future cash flows on the PCI loan, discounted at the loan's effective interest rate implicit in the loan. 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. 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. For further information regarding our acquired loans, see Note 3, Loans and Allowance for Loan Losses.
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 quantitative (e.g., historical loan loss rates) and qualitative risk 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 an 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 second component is an estimate of the probable inherent losses in each loan pool with similar 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 federal regulatory reporting codes ("CALL codes" or "segments"), which are further delineated by assigned credit risk ratings, as described in Note 3, Loans and Allowance for Loan Losses. Segments include the following: • 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 general allowances by loan segment based on quantitative (loss history) and qualitative risk factors. Qualitative internal and external risk factors include, but are not limited to, the following: • Changes in the nature and volume of the loan portfolio. • Changes in the volume and severity of past due loans, the volume of non-accruals loans, and the volume and severity of adversely classified or graded loans. • The existence and effect of individual loan and loan segment concentrations. • Changes in lending policies and procedures, including changes in underwriting standards and collection, charge-off, and recovery practices not considered elsewhere. • Changes in the experience, ability, and depth of lending management and other relevant staff. • Changes in the quality of our systematic loan review processes. • Changes in economic and business conditions, and developments that affect the collectability of the portfolio. • Changes in the value of underlying collateral, where applicable. • The effect of other external factors such as legal and regulatory requirements on the level of estimated credit losses in the portfolio. • The effect of acquisitions of other loan portfolios on our infrastructure, including risk associated with entering new geographic areas as a result of such acquisitions. • The presence of specialized lending segments in the portfolio. Beginning with the quarter ended March 31, 2016, Management enhanced its methodology for determining the quantitative and qualitative risk factors assigned to unimpaired loans in order to capture historical loss information at the loan level, track loss migration through risk grade deterioration, increase efficiencies related to performing the calculations, and refine how we incorporate environmental and other unique risk elements into our estimation of credit losses. The changes in methodology did not result in a material difference in general allowances. Prior to March 31, 2016, under the Bank's allowance model, each segment was assigned a quantitative loss factor that was primarily based on a rolling twenty-quarter look-back at our historical losses for that particular segment, as well as a number of other assumptions. Under the current methodology, the quantitative risk factor for each segment utilizes the greater of either the historical loss method based on a rolling twenty-four-quarter look-back period or migration analysis loss method based on loss history beginning March 2010. Under the historical loss method, quarterly loss rates are calculated for each segment by dividing annualized net charge-offs during each quarter by the quarter's average segment balances. The quarterly loss rates are averaged over the entire loss history period. Under the migration analysis method, loss rates are calculated at the risk grade and segment levels by dividing the net charge-off amount by the total segment balance at the beginning of each migration period where the charged-off loan in question was present. Migration loss rates are averaged for each risk grade and segment for the entire loss history period. For each segment, the loss rates that result in the larger of the migration loss reserves or segment historical loss reserves are applied to the current loan balances. Qualitative factors are combined with these quantitative factors at the segment level to arrive at the overall general allowances. We establish specific allowances to account for credit deterioration for probable decreases in cash flows for PCI loans subsequent to acquisition. The estimated cash flows expected to be collected on PCI loans is updated quarterly and requires the use of key assumptions and estimates based on factors such as the current economic environment, changes in collateral values, loan workout plans, changes in the probability of default, loss severities, and prepayments. Probable decreases in expected cash flows after acquisition result in impairment recorded as a specific allowance for loan losses or a charge-off to the allowance. Impairment is calculated as the present value of the expected future cash flows on the PCI loan, discounted at the loan's effective interest rate implicit in the loan. While we believe we use the best information available to determine the allowance for loan losses, our results of operations could be significantly affected if circumstances differ substantially from the assumptions used in determining the allowance. A decline in local and national economic conditions, or significant changes in other assumptions, could result in a material increase in the allowance for loan losses and may adversely affect our financial condition and results of operations. In addition, the determination of the amount of the allowance for loan losses is subject to review by bank regulators as part of their routine examination process, which may result in the establishment of additional allowance for loan losses based upon their judgment of information available to them at the time of their examination. For further information regarding the allowance for loan losses, see Note 3, Loans and Allowance for Loan Losses.
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 estimates of probability that these commitments will be 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	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 more likely than not that the fair value is more 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. 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 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 the estimated future benefit of deposits related to an acquisition and is booked separately from the related deposits and evaluated periodically for impairment. The core deposit intangible asset is amortized on an accelerated method over its estimated useful life of ten years.
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 ("BOLI") : The Bank owns life insurance policies on certain key current and former officers. 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 2016 , 2015 and 2014 , the Bank made only 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. 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, 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 8, Stockholders' Equity and Stock Option Plans for further discussion. We determine fair value of stock options at the grant date using a 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 exercises 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. In addition, we estimate forfeitures 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 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. The 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. The terms of our interest rate swap contracts 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. 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. For further detail, see Note 14, Derivative Financial Instruments and Hedging Activities.
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 9, Fair Value of Assets and Liabilities.
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 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 . This ASU was further clarified in December 2015 by ASU No. 2015-19, Technical Corrections and Improvements . These amendments 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 as an intangible asset. 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. We adopted the accounting standards on a prospective basis during the first quarter of 2016 with no material impact on our financial condition or results of operations. In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2014-09, Revenue from Contracts with Customers (Topic 606). This 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. Subsequent updates related to Revenue from Contracts with Customers (Topic 606) are as follows: • August 2015 ASU No. 2015-14 - Deferral of the Effective Date , institutes a one-year deferral of the effective date of this amendment to annual reporting periods beginning after December 15, 2017. Early application is permitted only as of annual periods beginning after December 15, 2016, including interim reporting periods within that reporting period. • March 2016 ASU No. 2016-08 - Principal versus Agent Considerations (Reporting Revenue Gross versus Net), clarifies the implementation guidance on principal versus agent considerations and on the use of indicators that assist an entity in determining whether it controls a specified good or service before it is transferred to the customer. • April 2016 ASU No. 2016-10 - Identifying Performance Obligations and Licensing, provides guidance in determining performance obligations in a contract with a customer and clarifies whether a promise to grant a license provides a right to access or the right to use intellectual property. • May 2016 ASU No. 2016-12 - Narrow Scope Improvements and Practical Expedients , gives further guidance on assessing collectability, presentation of sales taxes, noncash consideration, and completed contracts and contract modifications at transition. • December 2016 ASU No. 2016-20 - Technical Corrections and Improvements to Topic 606 , further clarifies specific aspects of previously issued guidance or corrects unintended application of the guidance. Our revenue is mainly comprised of net interest income on financial assets and financial liabilities, which is explicitly excluded from the scope of ASU 2014-09. While the recognition of certain revenue arrangements of components of our non-interest income may be affected by the ASU, we do not expect it to have a material impact on our financial condition and 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 accounting standards related to financial instruments, including the following: • Requires equity investments, except for those accounted for under the equity method of accounting or those that result in consolidation of the investee, 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. When impairment exists, an entity is required to measure the investment at fair value. • Eliminates the requirement 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. • Requires public companies 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 (i.e., securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements. • Clarifies that an 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 fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. This ASU may affect our financial statement presentation and related footnotes, but we do not expect it 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) . The amendments in this ASU intend to increase transparency and comparability among organizations by recognizing an asset, which represents the right to use the asset for the lease term, and a lease liability, which is a lessee's obligation to make lease payments measured on a discounted basis. This ASU generally applies to leasing arrangements exceeding a twelve month term. 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 method of adoption. Early application of the amendments is permitted. We intend to adopt this ASU during the first quarter of 2019, as required, and are currently evaluating accounting solutions. As of December 31, 2016 , our undiscounted operating lease obligations that were off-balance sheet totaled $21.1 million (See Note 12, Commitments and Contingencies). Upon adoption of this ASU, the present values of leases currently classified as operating leases will be recognized as lease assets and liabilities on our balance sheet. Additional disclosures of key information about our leasing arrangements will also be required. We do not expect the ASU will have a material impact on our capital ratios or return on average assets when adopted and we are currently evaluating the effect the ASU will have on other components of our financial condition and results of operations. In March 2016, the FASB issued ASU No. 2016-05, Derivatives and Hedging (Topic 815): Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships . A contract novation refers to replacing one of the parties to a derivative instrument with a new party. This ASU clarifies that a change in counterparty in a derivative instrument does not, in and of itself, require dedesignation of that hedging relationship and therefore discontinue the application of hedge accounting. ASU 2016-05 is effective for financial statements issued for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years. We have evaluated the requirements of this ASU and have determined that it will not have a material impact on our financial condition or results of operations upon adoption in the first quarter of 2017. In March 2016, the FASB issued ASU No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting . This ASU identifies areas for simplification involving several aspects of accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, forfeiture accounting, and classifications on the statement of cash flows. ASU 2016-09 is effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods. We have implemented the requirements of this ASU and have elected to change our accounting policy to recognize forfeitures as they occur starting January 1, 2017, which might cause earnings volatility in the future if there are material forfeitures. ASU 2016-09 also requires that all income tax effects related to settlements of share-based payment awards be reported in earnings as an increase (or decrease) to income tax expense. Previously, income tax benefits at settlement of an award were reported as an increase (or decrease) to stockholders' equity to the extent that those benefits were greater than (or less than) the income tax benefits recognized in earnings during the award's vesting period. The requirement to report those income tax effects in earnings will be applied to settlements occurring on or after January 1, 2017. These changes and those of the remaining provisions of ASU 2016-09 are not expected to have significant impact on our financial condition and results of operations. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments . Under the new guidance, entities will be required to measure expected credit losses by utilizing forward-looking information to assess an entity's allowance for credit losses. The measurement of expected credit losses is based on historical experience, current conditions and reasonable and supportable forecasts that affect the collectability of a credit over its remaining life. In addition, the ASU amends the accounting for potential credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. ASU 2016-13 is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. As discussed previously under Allowance For Loan Losses , Management refined our allowance for loan loss model in 2016 and enhanced our loan-level data collection and methodology for analyzing credit losses in preparation for the new accounting standards. We will continue our evaluation of the provisions of this ASU and will be monitoring developments, additional guidance and the potential outcome the amendments will have on our financial condition and results of operations upon adoption in the first quarter of 2020. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments . This ASU provides guidance on how to present and classify eight specific cash flow topics in the statement of cash flows. The ASU is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. The amendments should be applied using a retrospective transition method to each period presented, if practical. This ASU may affect our financial statement presentation, but we do not expect it to have a material impact on our financial condition, statements of cash flows, or results of operations. In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business . The amendments are intended to help companies evaluate whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses and provide a more robust framework to use in determining when a set of assets and activities is a business. The amendments are effective for annual periods after December 31, 2017, including interim periods within those periods. We will consider these amendments in our evaluation of the accounting for any future business acquisitions or disposals of assets, upon adoption in first quarter of 2018. In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment . This amendment simplifies how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test, which would measure a goodwill impairment loss by comparing the implied fair value of goodwill with the carrying amount of that goodwill. Instead, an entity will perform only Step 1 of its quantitative goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount, and then recognizing an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value. The loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. The new guidance does not amend the optional qualitative assessment of goodwill impairment, which Bancorp currently uses. The ASU is effective for fiscal years beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. We anticipate that this ASU will simplify our evaluation of the impairment of goodwill and do not expect it to have a material impact on our financial condition and results of operations.

Summary of Significant Accoun25

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	At December 31, 2016, the future estimated amortization expense is as follows: (in thousands) 2017 2018 2019 2020 2021 Thereafter Total Core deposit intangible amortization $ 472 $ 413 $ 388 $ 365 $ 343 $ 599 $ 2,580
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. Under the two-class method, the difference in EPS is not significant for these participating securities. (in thousands, except per share data) 2016 2015 2014 Weighted average basic shares outstanding 6,073 5,966 5,893 Potentially dilutive common shares related to: Stock options 34 41 43 Unvested restricted stock awards 8 5 5 Warrant — 53 65 Weighted average diluted shares outstanding 6,115 6,065 6,006 Net income $ 23,134 $ 18,441 $ 19,771 Basic EPS $ 3.81 $ 3.09 $ 3.35 Diluted EPS $ 3.78 $ 3.04 $ 3.29 Weighted average anti-dilutive shares not included in the calculation of diluted EPS 64 36 45

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 December 31, 2015 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 $ 30,856 $ 31,544 $ 694 $ (6 ) $ 42,919 $ 44,146 $ 1,246 $ (19 ) Corporate bonds 3,519 3,518 — (1 ) 15,072 15,098 42 (16 ) MBS pass-through securities issued by FHLMC and FNMA 10,063 10,035 126 (154 ) 11,646 11,810 171 (7 ) Total held-to-maturity 44,438 45,097 820 (161 ) 69,637 71,054 1,459 (42 ) Available-for-sale: Securities of U.S. government agencies: MBS pass-through securities issued by FHLMC and FNMA 193,998 190,566 145 (3,577 ) 138,222 138,462 694 (454 ) CMOs issued by FNMA 13,790 13,772 91 (109 ) 18,266 18,219 97 (144 ) CMOs issued by FHLMC 43,452 42,758 37 (731 ) 22,889 22,932 82 (39 ) CMOs issued by GNMA 6,844 6,945 102 (1 ) 10,326 10,480 169 (15 ) Debentures of government- sponsored agencies 35,486 35,403 7 (90 ) 161,690 160,892 28 (826 ) Privately issued CMOs 419 419 1 (1 ) 3,960 4,150 190 — Obligations of state and political subdivisions 79,306 77,701 135 (1,740 ) 57,110 57,673 580 (17 ) Corporate bonds 4,959 5,016 57 — 4,947 4,979 43 (11 ) Total available-for-sale 378,254 372,580 575 (6,249 ) 417,410 417,787 1,883 (1,506 ) Total investment securities $ 422,692 $ 417,677 $ 1,395 $ (6,410 ) $ 487,047 $ 488,841 $ 3,342 $ (1,548 )
Investments Classified by Contractual Maturity Date	The amortized cost and fair value of investment debt securities by contractual maturity at December 31, 2016 are shown below. Expected maturities may differ from contractual maturities if the issuers of the securities have the right to call or prepay obligations with or without call or prepayment penalties. December 31, 2016 December 31, 2015 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 $ 13,473 $ 13,506 $ 20,136 $ 20,109 $ 18,853 $ 18,920 $ 12,135 $ 12,176 After one but within five years 16,706 17,150 58,334 58,267 31,677 32,360 188,007 187,326 After five years through ten years 3,000 3,125 113,576 110,842 8,580 8,969 64,899 64,999 After ten years 11,259 11,316 186,208 183,362 10,527 10,805 152,369 153,286 Total $ 44,438 $ 45,097 $ 378,254 $ 372,580 $ 69,637 $ 71,054 $ 417,410 $ 417,787
Schedule of Unrealized Loss on Investments	Those securities are summarized and classified according to the duration of the loss period in the tables below: December 31, 2016 < 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 $ 2,250 $ (154 ) $ 2,250 $ (154 ) Obligations of state and political subdivisions 3,362 (6 ) 3,362 (6 ) Corporate bonds 3,518 (1 ) 3,518 (1 ) Total held-to-maturity 9,130 (161 ) — — 9,130 (161 ) Available-for-sale: MBS pass-through securities issued by FHLMC and FNMA 162,016 (3,577 ) 162,016 (3,577 ) CMOs issued by FNMA 9,498 (109 ) 9,498 (109 ) CMOs issued by FHLMC 31,545 (731 ) 31,545 (731 ) CMOs issued by GNMA 1,583 (1 ) 1,583 (1 ) Debentures of government- sponsored agencies 19,951 (38 ) 9,946 (52 ) 29,897 (90 ) Obligations of state and political subdivisions 59,567 (1,740 ) 59,567 (1,740 ) Privately issued CMO's 154 (1 ) 154 (1 ) Total available-for-sale 284,314 (6,197 ) 9,946 (52 ) 294,260 (6,249 ) Total temporarily impaired securities $ 293,444 $ (6,358 ) $ 9,946 $ (52 ) $ 303,390 $ (6,410 ) 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 and 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 and 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 )
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) 2016 2015 2014 Available-for-sale: Sales proceeds $ 68,673 $ 2,099 $ 2,436 Gross realized gains $ 458 $ 7 $ 4 Gross realized losses $ (64 ) $ (1 ) $ (28 ) Held-to-maturity: Sales proceeds $ 1,265 $ 1,015 $ 2,146 Gross realized gains $ 32 $ 73 $ 104 Gross realized losses $ — $ — $ —

Loans and Allowance for Loan 27

Loans and Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2016
Receivables [Abstract]
Past Due Financing Receivables	The following table shows outstanding loans by class and payment aging as of December 31, 2016 and 2015 . Loan Aging Analysis by Class (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, 2016 30-59 days past due $ 283 $ — $ — $ — $ 77 $ — $ 2 $ 362 60-89 days past due — — — — — 49 49 90 days or more past due — — — — 91 — — 91 Total past due 283 — — — 168 — 51 502 Current 218,332 247,713 724,228 74,809 117,039 78,549 25,444 1,486,114 Total loans 3 $ 218,615 $ 247,713 $ 724,228 $ 74,809 $ 117,207 $ 78,549 $ 25,495 $ 1,486,616 Non-accrual loans 2 $ — $ — $ — $ — $ 91 $ — $ 54 $ 145 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 1 Our residential loan portfolio does not include sub-prime loans, nor is it our 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 There were no purchased credit impaired ("PCI") loans that had stopped accreting interest at December 31, 2016 . Amounts include $1 thousand of PCI loans that had stopped accreting interest at December 31, 2015 . Amounts exclude accreting PCI loans of $2.9 million and $3.7 million at December 31, 2016 and 2015 , 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, 2016 or 2015 . 3 Amounts include net deferred loan origination costs of $883 thousand and $768 thousand at December 31, 2016 and 2015 , respectively. Amounts are also net of unaccreted purchase discounts on non-PCI loans of $1.8 million and $3.2 million at December 31, 2016 and 2015 , respectively.
Financing Receivable Credit Quality Indicators	The following table represents an analysis of the carrying amount in loans, net of deferred fees or costs and purchase premiums or discounts, by internally assigned risk grades, including PCI loans, at December 31, 2016 and 2015 . Credit Risk Profile by Internally Assigned Risk Grade (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 December 31, 2016 Pass $ 201,987 $ 234,849 $ 720,417 $ 71,564 $ 115,680 $ 78,549 $ 25,083 $ 2,920 $ 1,451,049 Special Mention 9,197 4,799 607 — 1,334 — — — 15,937 Substandard 7,391 6,993 1,498 3,245 91 — 412 — 19,630 Total loans $ 218,575 $ 246,641 $ 722,522 $ 74,809 $ 117,105 $ 78,549 $ 25,495 $ 2,920 $ 1,486,616 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
Troubled Debt Restructurings on Financing Receivables	The table below summarizes the carrying amount of TDR loans by loan class as of December 31, 2016 and December 31, 2015 . 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, 2016 December 31, 2015 Commercial and industrial $ 2,207 $ 4,698 Commercial real estate, owner-occupied 6,993 6,993 Commercial real estate, investor 2,256 514 Construction 2 3,245 3,238 Home equity 625 460 Other residential 1,965 2,010 Installment and other consumer 877 1,168 Total $ 18,168 $ 19,081 1 There were no TDR loans on non-accrual status at December 31, 2016 and $72 thousand in TDR loans on non-accrual status as of December 31, 2015 . Includes no acquired loans as of December 31, 2016 and $137 thousand in acquired loans at December 31, 2015 . 2 In 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 2015 for no additional 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 TDRs modified during 2016: Commercial real estate, investor 2 $ 1,830 $ 1,826 $ 1,752 Home equity 1 1 $ 87 $ 222 $ 245 Installment and other consumer 1 $ 68 $ 67 $ 66 Total 4 $ 1,985 $ 2,115 $ 2,063 1 The home equity line of credit modified in 2016 included debt consolidation, which increased the post-modification balance. TDRs modified during 2015: Commercial and industrial 7 $ 3,271 $ 3,251 $ 2,811 TDRs modified during 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
Impaired Financing Receivables	The table below summarizes information by class 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, 2016 Recorded investment in impaired loans: With no specific allowance recorded $ 315 $ — $ — $ 2,692 $ 91 $ 1,008 $ 103 $ 4,209 With a specific allowance recorded 1,892 6,993 2,256 553 624 957 829 14,104 Total recorded investment in impaired loans $ 2,207 $ 6,993 $ 2,256 $ 3,245 $ 715 $ 1,965 $ 932 $ 18,313 Unpaid principal balance of impaired loans $ 2,177 $ 6,993 $ 2,252 $ 3,238 $ 713 $ 1,965 $ 932 $ 18,270 Specific allowance $ 285 $ 163 $ 375 $ 8 $ 7 $ 55 $ 98 $ 991 Average recorded investment in impaired loans during 2016 $ 3,514 $ 7,069 $ 2,950 $ 3,242 $ 945 $ 1,988 $ 1,127 $ 20,835 Interest income recognized on impaired loans during 2016 1 $ 175 $ 199 $ 1,514 $ 137 $ 60 $ 90 $ 48 $ 2,223 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 $ 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 1 $ 238 $ 295 $ 33 $ 86 $ 18 $ 92 $ 64 $ 826 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 1 $ 378 $ 288 $ 28 $ 85 $ 19 $ 74 $ 76 $ 948 1 Interest income recognized on a cash basis totaled $1.4 million in 2016 and was primarily related to the interest recovery upon the pay-off of a partially charged off non-accrual commercial real estate loan during the third quarter. No interest interest income on impaired loans was recognized on a cash basis in 2015 and 2014.
Allowance for Credit Losses on Financing Receivables	The following tables disclose activity in the ALLL and the recorded investment in loans by class, as well as the related ALLL disaggregated by impairment evaluation method. 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, 2016 Beginning balance $ 3,023 $ 2,249 $ 6,178 $ 724 $ 910 $ 394 $ 425 $ 1,096 $ 14,999 Provision (reversal) 93 (476 ) (2,014 ) 57 60 60 (75 ) 445 (1,850 ) Charge-offs (11 ) (20 ) — — — — (5 ) — (36 ) Recoveries 143 — 2,156 — 3 — 27 — 2,329 Ending balance $ 3,248 $ 1,753 $ 6,320 $ 781 $ 973 $ 454 $ 372 $ 1,541 $ 15,442 Year ended December 31, 2015 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 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 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 December 31, 2016 Ending ALLL related to loans collectively evaluated for impairment $ 2,963 $ 1,590 $ 5,945 $ 773 $ 966 $ 399 $ 274 $ 1,541 $ 14,451 Ending ALLL related to loans individually evaluated for impairment 285 163 375 8 7 55 98 — 991 Ending ALLL related to purchased credit-impaired loans — — — — — — — — — Ending balance $ 3,248 $ 1,753 $ 6,320 $ 781 $ 973 $ 454 $ 372 $ 1,541 $ 15,442 Recorded Investment: Collectively evaluated for impairment $ 216,368 $ 239,648 $ 720,266 $ 71,564 $ 116,390 $ 76,584 $ 24,563 $ — $ 1,465,383 Individually evaluated for impairment 2,207 6,993 2,256 3,245 715 1,965 932 — 18,313 Purchased credit-impaired 40 1,072 1,706 — 102 — — — 2,920 Total $ 218,615 $ 247,713 $ 724,228 $ 74,809 $ 117,207 $ 78,549 $ 25,495 $ — $ 1,486,616 Ratio of allowance for loan losses to total loans 1.49 % 0.71 % 0.87 % 1.04 % 0.83 % 0.58 % 1.46 % NM 1.04 % Allowance for loan losses to non-accrual loans NM NM NM NM 1,071 % NM 683 % NM 10,650 % 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 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 Totals exclude $138 thousand in 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
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period	The following table reflects the unpaid principal balance and related carrying value of PCI loans: PCI Loans December 31, 2016 December 31, 2015 (in thousands) Unpaid Principal Balance Carrying Value Unpaid Principal Balance Carrying Value Commercial and industrial $ 45 $ 40 $ 237 $ 175 Commercial real estate, owner occupied 1,344 1,072 2,573 1,711 Commercial real estate, investor 1,713 1,706 1,756 1,726 Construction — — 187 1 Home equity 248 102 224 68 Total purchased credit-impaired loans $ 3,350 $ 2,920 $ 4,977 $ 3,681
Accretable Yield Activity	The activities in the accretable yield, or income expected to be earned over the remaining lives of the PCI loans were as follows: Accretable Yield Years ended (in thousands) December 31, 2016 December 31, 2015 December 31, 2014 Balance at beginning of period $ 2,618 $ 4,027 $ 3,649 Additions — — — Removals 1 (778 ) (914 ) (273 ) Accretion (364 ) (495 ) (613 ) Reclassifications from nonaccretable difference 2 — — 1,264 Balance at end of period $ 1,476 $ 2,618 $ 4,027 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, 2016 , 2015 and 2014 is as follows: (in thousands) 2016 2015 2014 Balance at beginning of year $ 2,562 $ 3,329 $ 3,749 Additions — — — Advances — 165 — Repayments (574 ) (390 ) (420 ) Reclassified as unrelated-party loan due to a change in borrower status — (542 ) — Balance at end of year $ 1,988 $ 2,562 $ 3,329

Bank Premises and Equipment (Ta

Bank Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Summary of Bank Premises and Equipment	A summary of Bank premises and equipment at December 31 follows: (in thousands) 2016 2015 Leasehold improvements $ 13,883 $ 13,615 Furniture and equipment 10,627 9,887 Subtotal 24,510 23,502 Accumulated depreciation and amortization (15,990 ) (14,197 ) Bank premises and equipment, net $ 8,520 $ 9,305

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2016
Banking and Thrift [Abstract]
Schedule of Time Deposits	A stratification of time deposits at December 31, 2016 and 2015 is presented in the following table: (in thousands) December 31, 2016 December 31, 2015 Time deposits of less than $100 thousand $ 36,346 $ 39,534 Time deposits of $100 thousand to $250 thousand 66,092 67,352 Time deposits of more than $250 thousand 49,025 54,571 Total time deposits $ 151,463 $ 161,457
Schedule of Maturities for Time Deposits	Scheduled maturities of time deposits at December 31, 2016 are presented as follows: (in thousands) 2017 2018 2019 2020 2021 Thereafter Total Scheduled maturities of time deposits $ 104,616 $ 12,325 $ 7,891 $ 7,246 $ 19,385 $ — $ 151,463

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 : (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 (3.93% as of December 31, 2016), 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 (2.36% as of December 31, 2016), redeemable, in whole or in part, on any interest payment date 4,124 Total $ 8,248
Schedule of Borrowings	Borrowings at December 31, 2016 and 2015 are summarized as follows: 2016 2015 (dollars in thousands) Carrying Value Average Balance Average Rate Carrying Value Average Balance Average Rate FHLB overnight borrowings $ — $ 5,383 0.42 % $ 52,000 $ 784 0.38 % FHLB fixed-rate advances $ — $ 6,803 6.59 % 1 $ 15,000 $ 15,000 2.07 % Subordinated debentures $ 5,586 $ 5,493 7.80 % $ 5,395 $ 5,288 7.94 % 1 Amount includes the impact of the $312 thousand prepayment fee in 2016 discussed above.

Stockholders' Equity and Stoc31

Stockholders' Equity and Stock Plans (Tables)	12 Months Ended
	Dec. 31, 2016
Equity [Abstract]
Schedule of Share-based Compensation, Stock Options, Activity	A summary of activity for stock options for the years ended December 31, 2016 , 2015 and 2014 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. Number of Shares Weighted Average Exercise Price Aggregate Intrinsic Value (in thousands) Weighted Average Grant-Date Fair Value Weighted Average Remaining Contractual Term (in years) 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 Options outstanding at December 31, 2015 185,269 38.35 2,788 5.00 Granted 32,637 49.37 10.11 Exercised (36,117 ) 33.98 661 Options outstanding at December 31, 2016 181,789 41.20 5,190 5.77 Exercisable (vested) at December 31, 2016 103,211 36.65 3,416 4.18
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, 2016 . Number of options 177,122 Weighted average exercise price $ 41.03 Aggregate intrinsic value (in thousands) $ 5,086 Weighted average remaining contractual term (in years) 5.71
Schedule of Unrecognized Compensation Cost, Nonvested Awards	The following table summarizes non-vested restricted stock awards and changes during the years ended December 31, 2016 , 2015 and 2014 . Restricted Stock Awards Number of Shares Weighted Average Grant-Date Fair Value 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 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 Granted 16,910 49.65 Vested (8,599 ) 44.14 Non-vested awards at December 31, 2016 39,699 48.15
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, 2016 is presented in the following table: Stock Options Outstanding as of December 31, 2016 Stock Options Exercisable as of December 31, 2016 Range of Exercise Prices Stock Options Outstanding Remaining Contractual Life (in years) Weighted Average Exercise Price Stock Options Exercisable Weighted Average Exercise Price $20.00 - $25.00 13,138 2.3 $ 22.25 13,138 $ 22.25 $25.01 - $30.00 10,180 1.3 28.75 10,180 28.75 $30.01 - $35.00 9,195 3.3 33.10 9,195 33.10 $35.01 - $40.00 46,588 4.1 37.70 39,038 37.48 $40.01 - $45.00 29,551 5.9 41.95 17,130 41.91 $45.01 - $50.00 45,187 8.7 48.40 5,020 45.88 $50.01 - $55.00 27,950 7.9 50.70 9,510 50.69 181,789 103,211
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	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, and the following assumptions (weighted-average shown). Years ended December 31, 2016 2015 2014 Risk-free interest rate 1.37 % 1.67 % 2.04 % Expected dividend yield on common stock 2.02 % 1.75 % 1.70 % Expected life in years 6.0 6.0 6.0 Expected price volatility 25.56 % 28.06 % 30.32 %
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. On January 20, 2017, the Board of Directors declared a cash dividend of $0.27 per share, payable on February 10, 2017 to shareholders of record at the close of business on February 3, 2017. Years ended December 31, (in thousands except per share data) 2016 2015 2014 Cash dividends to common stockholders $ 6,223 $ 5,390 $ 4,733 Cash dividends per common share $ 1.02 $ 0.90 $ 0.80

Fair Value of Assets and Liab32

Fair Value of Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 Securities available for sale: Mortgage-backed securities and collaterized mortgage obligations issued by U.S. government agencies $ 254,041 $ — $ 253,434 $ 607 Debentures of government sponsored agencies $ 35,403 $ — $ 35,403 $ — Privately-issued collateralized mortgage obligations $ 419 $ — $ 419 $ — Obligations of state and political subdivisions $ 77,701 $ — $ 77,701 $ — Corporate bonds $ 5,016 $ — $ 5,016 $ — Derivative financial assets (interest rate contracts) $ 55 $ — $ 55 $ — Derivative financial liabilities (interest rate contracts) $ 933 $ — $ 933 $ — December 31, 2015 Securities available for sale: Mortgage-backed securities and collaterized mortgage obligations issued by U.S. government 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 $ —
Fair Value Measurements, Nonrecurring	The following table presents the carrying value of assets and liabilities measured at fair value on a non-recurring basis and that were held in the consolidated statements of condition at each respective period end, by level within the fair value hierarchy as of December 31, 2016 and 2015 . (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, 2016 Other real estate $ 408 $ — $ — $ 408 December 31, 2015 Other real estate $ 421 $ — $ — $ 421
Fair Value, by Balance Sheet Grouping	The table below is a summary of fair value estimates for financial instruments as of December 31, 2016 and 2015 , 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. Further, 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 BOLI. Additionally, we hold shares of FHLB stock and Visa Inc. Class B common stock at cost. These shares are restricted from resale and their values were discussed in Note 2, Investment Securities, above. December 31, 2016 December 31, 2015 (in thousands) Carrying Amounts Fair Value Fair Value Hierarchy Carrying Amounts Fair Value Fair Value Hierarchy Financial assets: Cash and cash equivalents $ 48,804 $ 48,804 Level 1 $ 26,343 $ 26,343 Level 1 Investment securities held-to-maturity 44,438 45,097 Level 2 69,637 71,054 Level 2 Loans, net 1,471,174 1,473,360 Level 3 1,436,229 1,470,380 Level 3 Interest receivable 6,319 6,319 Level 2 6,643 6,643 Level 2 Financial liabilities: Deposits 1,772,700 1,773,102 Level 2 1,728,226 1,728,717 Level 2 Federal Home Loan Bank borrowing — — Level 2 67,000 67,279 Level 2 Subordinated debentures 5,586 5,083 Level 3 5,395 5,132 Level 3 Interest payable 134 134 Level 2 187 187 Level 2

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2016
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) 2016 2015 2014 Current tax provision Federal $ 9,710 $ 7,097 $ 8,523 State 3,794 2,931 3,195 Total current 13,504 10,028 11,718 Deferred tax provision (benefit) Federal (206 ) 382 (146 ) State 48 80 126 Total deferred (158 ) 462 (20 ) Total income tax provision $ 13,346 $ 10,490 $ 11,698
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) 2016 2015 Deferred tax assets: Allowance for loan losses and off-balance sheet credit commitments $ 6,871 $ 5,918 Net operating loss carryforwards 3,582 4,090 Net unrealized loss on securities available-for-sale 2,543 59 Deferred compensation plan and salary continuation plan 1,773 1,619 State franchise tax 1,300 1,005 Accrued but unpaid expenses 1,251 1,188 Fair value adjustment on acquired loans 799 1,197 Deferred rent and other lease incentives 547 595 Depreciation and disposals on premises and equipment 528 231 Other real estate owned 448 448 Stock-based compensation 398 273 Interest received on non-accrual loans 185 864 Other 196 381 Total gross deferred tax assets 20,421 17,868 Deferred tax liabilities: Deferred loan origination costs and fees (2,784 ) (2,567 ) Unaccreted discount on subordinated debentures (1,119 ) (1,200 ) Core deposit intangible asset (1,085 ) (1,309 ) Accretion on investment securities (54 ) (55 ) Other (42 ) (42 ) Total gross deferred tax liabilities (5,084 ) (5,173 ) Net deferred tax assets $ 15,337 $ 12,695
Schedule of Effective Income Tax Rate Reconciliation	The effective tax rate for 2016 , 2015 and 2014 differs from the current federal statutory income tax rate as follows: 2016 2015 2014 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 % 6.8 % Tax exempt interest on municipal securities and loans (4.0 )% (4.2 )% (3.3 )% Tax exempt earnings on bank owned life insurance (0.8 )% (1.0 )% (0.9 )% Low income housing and qualified zone academy bond tax credits (0.3 )% (0.2 )% (0.1 )% Other (0.1 )% (0.1 )% (0.3 )% Effective Tax Rate 36.6 % 36.3 % 37.2 %

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	At December 31, 2016 , the approximate minimum future commitments payable under non-cancelable contracts for leased premises are as follows: (in thousands) 2017 2018 2019 2020 2021 Thereafter Total Operating leases 1 $ 3,850 $ 3,919 $ 3,725 $ 3,405 $ 2,114 $ 4,069 $ 21,082

Derivative Financial Instrume35

Derivative Financial Instruments and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 December 31, 2015 December 31, 2016 December 31, 2015 Fair value hedges: Interest rate contracts notional amount $ 4,217 $ 4,407 $ 15,495 $ 22,187 Interest rate contracts fair value 1 $ 55 $ 3 $ 933 $ 1,658
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance	Years ended December 31, (in thousands) 2016 2015 2014 Increase (decrease) in value of designated interest rate swaps due to LIBOR interest rate movements recognized in interest income $ 778 $ 280 $ (377 ) Payment on interest rate swaps recorded in interest income (556 ) (918 ) (1,002 ) (Decrease) increase in value of hedged loans recognized in interest income (571 ) (308 ) 662 Decrease in value of yield maintenance agreement recognized against interest income (94 ) (52 ) (91 ) Net loss on derivatives recognized against interest income 2 $ (443 ) $ (998 ) $ (808 ) 1 See Note 9, Fair Value of Assets and Liabilities for valuation methodology. 2 Includes hedge ineffectiveness gain of $113 thousand , loss of $80 thousand and gain of $194 thousand for the years December 31, 2016 , 2015 and 2014 , 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 exactly offset the change in the fair value of the hedged items from period to period.
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 December 31, 2016 Derivatives by Counterparty: Counterparty A $ 55 $ 55 $ (55 ) $ — Total $ 55 $ — $ 55 $ (55 ) $ — $ — December 31, 2015 Derivatives by Counterparty: Counterparty A $ 3 $ — $ 3 $ (3 ) $ — $ — Total $ 3 $ — $ 3 $ (3 ) $ — $ — 1 Amounts exclude accrued interest totaling $1 thousand at both December 31, 2016 and December 31, 2015 , 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 December 31, 2016 Derivatives by Counterparty: Counterparty A $ 933 $ 933 $ (55 ) (878 ) $ — Total $ 933 $ — $ 933 $ (55 ) $ (878 ) $ — 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 ) $ —
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 December 31, 2016 Derivatives by Counterparty: Counterparty A $ 933 $ 933 $ (55 ) (878 ) $ — Total $ 933 $ — $ 933 $ (55 ) $ (878 ) $ — 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 ) $ — 2 Amounts exclude accrued interest totaling $12 thousand and $27 thousand at December 31, 2016 and December 31, 2015 , respectively.

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2016
Banking and Thrift [Abstract]
Schedule of Capital Adequacy Ratios	The Bancorp’s and Bank's capital adequacy ratios as of December 31, 2016 and 2015 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 build capital in 2016 through the accumulation of net income. Capital Ratios for Bancorp (dollars in thousands) Actual Ratio Adequately Capitalized Threshold 1 Ratio to be a Well Capitalized Bank Holding Company December 31, 2016 Amount Ratio Amount Ratio Amount Ratio Total Capital (to risk-weighted assets) $ 247,453 14.32 % ≥ $ 149,039 ≥ 8.625 % ≥ $ 172,799 ≥ 10.000 % Tier 1 Capital (to risk-weighted assets) $ 231,111 13.37 % ≥ $ 114,479 ≥ 6.625 % ≥ $ 138,239 ≥ 8.000 % Tier 1 Capital (to average assets) $ 231,111 11.39 % ≥ $ 81,189 ≥ 4.000 % ≥ $ 101,486 ≥ 5.000 % Common Equity Tier 1 (to risk-weighted assets) $ 225,925 13.07 % ≥ $ 88,559 ≥ 5.125 % ≥ $ 112,319 ≥ 6.500 % December 31, 2015 Total Capital (to risk-weighted assets) $ 227,269 13.37 % ≥ $ 135,996 ≥ 8.000 % ≥ $ 169,995 ≥ 10.000 % Tier 1 Capital (to risk-weighted assets) $ 211,521 12.44 % ≥ $ 101,997 ≥ 6.000 % ≥ $ 135,996 ≥ 8.000 % Tier 1 Capital (to average assets) $ 211,521 10.67 % ≥ $ 79,296 ≥ 4.000 % ≥ $ 99,120 ≥ 5.000 % Common Equity Tier 1 (to risk-weighted assets) $ 206,724 12.16 % ≥ $ 76,498 ≥ 4.500 % ≥ $ 110,497 ≥ 6.500 % 1 The 2016 adequately capitalized threshold includes the capital conservation buffer that was effective January 1, 2016. These ratios are not reflected on a fully phased-in basis, which will occur in January 2019. Capital Ratios for the Bank (dollars in thousands) Actual Ratio Adequately Capitalized Threshold 1 Ratio to be Well Capitalized under Prompt Corrective Action Provisions December 31, 2016 Amount Ratio Amount Ratio Amount Ratio Total Capital (to risk-weighted assets) $ 243,468 14.09 % ≥ $ 149,016 ≥ 8.625 % ≥ $ 172,772 ≥ 10.000 % Tier 1 Capital (to risk-weighted assets) $ 227,127 13.15 % ≥ $ 114,462 ≥ 6.625 % ≥ $ 138,218 ≥ 8.000 % Tier 1 Capital (to average assets) $ 227,127 11.19 % ≥ $ 81,176 ≥ 4.000 % ≥ $ 101,469 ≥ 5.000 % Common Equity Tier 1 (to risk-weighted assets) $ 227,127 13.15 % ≥ $ 88,546 ≥ 5.125 % ≥ $ 112,302 ≥ 6.500 % December 31, 2015 Total Capital (to risk-weighted assets) $ 222,830 13.11 % ≥ $ 135,968 ≥ 8.000 % ≥ $ 169,960 ≥ 10.000 % Tier 1 Capital (to risk-weighted assets) $ 207,082 12.18 % ≥ $ 101,976 ≥ 6.000 % ≥ $ 135,968 ≥ 8.000 % Tier 1 Capital (to average assets) $ 207,082 10.45 % ≥ $ 79,268 ≥ 4.000 % ≥ $ 99,085 ≥ 5.000 % Common Equity Tier 1 (to risk-weighted assets) $ 207,082 12.18 % ≥ $ 76,482 ≥ 4.500 % ≥ $ 110,474 ≥ 6.500 % 1 The 2016 adequately capitalized threshold includes the capital conservation buffer that was effective January 1, 2016. These ratios are not reflected on a fully phased-in basis, which will occur in January 2019.

Financial Instruments with Of37

Financial Instruments with Off-Balance Sheet Risk Financial Instruments with Off-Balance Sheet Risk (Tables)	12 Months Ended
	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Schedule of Contractual Amount, Off-Balance Sheet Risks	The contractual amount of undrawn loan commitments and standby letters of credit not reflected on the consolidated statements of condition are as follows: (in thousands) December 31, 2016 December 31, 2015 Commercial lines of credit $ 216,774 $ 191,305 Revolving home equity lines 148,143 130,359 Undisbursed construction loans 44,798 39,442 Personal and other lines of credit 10,635 11,112 Standby letters of credit 1,939 4,381 Total commitments and standby letters of credit $ 422,289 $ 376,599

Condensed Bank of Marin Banco38

Condensed Bank of Marin Bancorp Parent Only Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 and 2015 (in thousands) 2016 2015 Assets Cash and due from Bank of Marin $ 3,568 $ 3,796 Investment in bank subsidiary 232,431 215,722 Other assets 670 770 Total assets $ 236,669 $ 220,288 Liabilities and Stockholders' Equity Subordinated debentures $ 5,586 $ 5,395 Accrued expenses payable 96 109 Other liabilities 424 311 Total liabilities 6,106 5,815 Stockholders' equity 230,563 214,473 Total liabilities and stockholders' equity $ 236,669 $ 220,288
Schedule of Condensed Income Statement	CONDENSED UNCONSOLIDATED STATEMENTS OF INCOME Years ended December 31, 2016, 2015 and 2014 (in thousands) 2016 2015 2014 Income Dividends from bank subsidiary $ 6,400 $ 6,500 $ — Miscellaneous Income 7 6 8 Total income 6,407 6,506 8 Expense Interest expense 435 420 421 Non-interest expense 984 973 851 Total expense 1,419 1,393 1,272 Income (loss) before income taxes and equity in undistributed net income of subsidiary 4,988 5,113 (1,264 ) Income tax benefit 594 583 532 Income (loss) before equity in undistributed net income of subsidiary 5,582 5,696 (732 ) Earnings of bank subsidiary greater (less) than dividends received from bank subsidiary 17,552 12,745 20,503 Net income $ 23,134 $ 18,441 $ 19,771
Schedule of Condensed Cash Flow Statement	CONDENSED UNCONSOLIDATED STATEMENTS OF CASH FLOWS Years ended December 31, 2016, 2015 and 2014 (in thousands) 2016 2015 2014 Cash Flows from Operating Activities: Net income $ 23,134 $ 18,441 $ 19,771 Adjustments to reconcile net income to net cash provided by (used in) operating activities: Earnings of bank subsidiary greater than dividends received from bank subsidiary (17,552 ) (12,745 ) (20,503 ) Net change in operating assets and liabilities: Accretion of discount on subordinated debentures 191 210 216 Other assets 353 (298 ) (88 ) Intercompany receivable 171 (18 ) — Other liabilities (302 ) 368 (99 ) Net cash provided by (used in) operating activities 5,995 5,958 (703 ) Cash Flows from Investing Activities: Capital contribution to subsidiary (1,285 ) (1,156 ) (1,475 ) Net cash used in investing activities (1,285 ) (1,156 ) (1,475 ) Cash Flows from Financing Activities: Stock options exercised and stock purchases 1,285 1,156 1,475 Dividends paid on common stock (6,223 ) (5,390 ) (4,733 ) Net cash used by financing activities (4,938 ) (4,234 ) (3,258 ) Net (decrease) increase in cash and cash equivalents (228 ) 568 (5,436 ) Cash and cash equivalents at beginning of period 3,796 3,228 8,664 Cash and cash equivalents at end of period $ 3,568 $ 3,796 $ 3,228 Supplemental schedule of non-cash investing and financing activities: Stock issued in payment of director fees $ 234 $ 275 $ 236

Summary of Significant Accoun39

Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)paymentbranch	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Entity Location [Line Items]
Number of consecutive payments considered sustained repayment performance | payment	6
Threshold period a past due loan is charged off	90 days
Threshold period a past due overdraft account is charged off	60 days
Ownership interest in each limited partnerships formed for affordable housing projects (less than)	2.00%
Advertising costs | $	$ 565	$ 334	$ 400
Commitments under operating leases | $	$ 21,082
Marin County
Entity Location [Line Items]
Number of branches	10
Napa County
Entity Location [Line Items]
Number of branches	1
San Francisco
Entity Location [Line Items]
Number of branches	1
Sonoma County
Entity Location [Line Items]
Number of branches	5
Alameda County
Entity Location [Line Items]
Number of branches	3

Summary of Significant Accoun40

Summary of Significant Accounting Policies - Premises and Equipment (Details)	12 Months Ended
	Dec. 31, 2016
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 - Future Amortization Expense of Core Deposits (Details) - Core deposit intangible $ in Thousands	Dec. 31, 2016USD ($)
Finite-Lived Intangible Assets [Line Items]
2,017	$ 472
2,018	413
2,019	388
2,020	365
2,021	343
Thereafter	599
Total core deposit intangible amortization	$ 2,580

Summary of Significant Accoun42

Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share, Basic and Diluted [Abstract]
Weighted average basic shares outstanding (in shares)	6,073	5,966	5,893
Potential common shares related to stock options (in shares)	34	41	43
Potential common shares related to unvested restricted stock awards (in shares)	8	5	5
Potential common shares related to warrants (in shares)	0	53	65
Weighted average diluted shares outstanding (in shares)	6,115	6,065	6,006
Net income	$ 23,134	$ 18,441	$ 19,771
Basic EPS (in dollars per share)	$ 3.81	$ 3.09	$ 3.35
Diluted EPS (in dollars per share)	$ 3.78	$ 3.04	$ 3.29
Weighted average anti-dilutive shares not included in the calculation of diluted EPS (shares)	64	36	45

Investment Securities - Amortiz

Investment Securities - Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Held to maturity, Amortized Cost	$ 44,438	$ 69,637
Held-to-maturity, Fair Value	45,097	71,054
Held-to-maturity, Gross Unrealized Gains	820	1,459
Held-to-maturity, Gross Unrealized (Losses)	(161)	(42)
Available for sale, Amortized Cost	378,254	417,410
Available-for-sale, at fair value	372,580	417,787
Available-for-sale, Gross Unrealized Gains	575	1,883
Available-for-sale, Gross Unrealized (Losses)	(6,249)	(1,506)
Total investment securities, Amortized Cost	422,692	487,047
Total investment securities, Fair Value	417,677	488,841
Total investment securities, Gross Unrealized Gains	1,395	3,342
Total investment securities, Gross Unrealized (Losses)	(6,410)	(1,548)
MBS pass-through securities
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for sale, Amortized Cost	193,998	138,222
Available-for-sale, at fair value	190,566	138,462
Available-for-sale, Gross Unrealized Gains	145	694
Available-for-sale, Gross Unrealized (Losses)	(3,577)	(454)
CMOs issued by FNMA
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for sale, Amortized Cost	13,790	18,266
Available-for-sale, at fair value	13,772	18,219
Available-for-sale, Gross Unrealized Gains	91	97
Available-for-sale, Gross Unrealized (Losses)	(109)	(144)
CMOs issued by FHLMC
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for sale, Amortized Cost	43,452	22,889
Available-for-sale, at fair value	42,758	22,932
Available-for-sale, Gross Unrealized Gains	37	82
Available-for-sale, Gross Unrealized (Losses)	(731)	(39)
CMOs issued by GNMA
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for sale, Amortized Cost	6,844	10,326
Available-for-sale, at fair value	6,945	10,480
Available-for-sale, Gross Unrealized Gains	102	169
Available-for-sale, Gross Unrealized (Losses)	(1)	(15)
Debentures of government-sponsored agencies
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for sale, Amortized Cost	35,486	161,690
Available-for-sale, at fair value	35,403	160,892
Available-for-sale, Gross Unrealized Gains	7	28
Available-for-sale, Gross Unrealized (Losses)	(90)	(826)
Privately-issued CMOs
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for sale, Amortized Cost	419	3,960
Available-for-sale, at fair value	419	4,150
Available-for-sale, Gross Unrealized Gains	1	190
Available-for-sale, Gross Unrealized (Losses)	(1)	0
Obligations of state and political subdivisions
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Held to maturity, Amortized Cost	30,856	42,919
Held-to-maturity, Fair Value	31,544	44,146
Held-to-maturity, Gross Unrealized Gains	694	1,246
Held-to-maturity, Gross Unrealized (Losses)	(6)	(19)
Available for sale, Amortized Cost	79,306	57,110
Available-for-sale, at fair value	77,701	57,673
Available-for-sale, Gross Unrealized Gains	135	580
Available-for-sale, Gross Unrealized (Losses)	(1,740)	(17)
Corporate bonds
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Held to maturity, Amortized Cost	3,519	15,072
Held-to-maturity, Fair Value	3,518	15,098
Held-to-maturity, Gross Unrealized Gains	0	42
Held-to-maturity, Gross Unrealized (Losses)	(1)	(16)
Available for sale, Amortized Cost	4,959	4,947
Available-for-sale, at fair value	5,016	4,979
Available-for-sale, Gross Unrealized Gains	57	43
Available-for-sale, Gross Unrealized (Losses)	0	(11)
MBS pass-through securities
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Held to maturity, Amortized Cost	10,063	11,646
Held-to-maturity, Fair Value	10,035	11,810
Held-to-maturity, Gross Unrealized Gains	126	171
Held-to-maturity, Gross Unrealized (Losses)	$ (154)	$ (7)

Investment Securities - Maturit

Investment Securities - Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Held to Maturity, Amortized Cost, Within one year	$ 13,473	$ 18,853
Held to Maturity, Fair Value, Within one year	13,506	18,920
Available for Sale Securities, Amortized Cost, Within one year	20,136	12,135
Available for Sale Securities, Debt Maturities, Fair Value, Within one year	20,109	12,176
Held to Maturity, Amortized Cost, After one but within five years	16,706	31,677
Held to Maturity, Fair Value, After one but within five years	17,150	32,360
Available for Sale, Amortized Cost, After one but within five years	58,334	188,007
Available for Sale, Fair Value, After one but within five years	58,267	187,326
Held to Maturity, Amortized Cost, After five years through ten years	3,000	8,580
Held to Maturity, Fair Value, After five years through ten years	3,125	8,969
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	113,576	64,899
Available for Sale, Fair Value, After five years through ten years	110,842	64,999
Held to Maturity, Amortized Cost, After ten years	11,259	10,527
Held to Maturity, Fair Value, After ten years	11,316	10,805
Available for Sale, Amortized Cost, After five years through ten years	186,208	152,369
Available for Sale, Fair Value, After ten years	183,362	153,286
Held to Maturity, Amortized Cost, Total	44,438	69,637
Held-to-Maturity, Fair Value, Total	45,097	71,054
Available for Sale, Amortized Cost, Total	378,254	417,410
Available for Sale, Fair Value, Total	$ 372,580	$ 417,787

Investment Securities - Securit

Investment Securities - Securities Sold, Pledged as Collateral and Transfers (Details) - USD ($) $ in Thousands	Feb. 24, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Available-for-sale:
Sales proceeds		$ 68,673	$ 2,099	$ 2,436
Gross realized gains		458	7	4
Gross realized losses		(64)	(1)	(28)
Held-to-maturity:
Sales proceeds		1,265	1,015	2,146
Gross realized gains		32	73	104
Gross realized losses		0	0	0
Securities transferred from available-for-sale to held-to-maturity		0	0	$ 14,297
Subsequent event
Held-to-maturity:
Securities transferred from available-for-sale to held-to-maturity	$ 129,000
Unrealized pre-tax loss from transfer of available-for-sale securities to held-to-maturity	$ 3,000
State of California
Available-for-sale:
Available-for-sale securities pledged as collateral		109,100	87,900
Public Deposits
Available-for-sale:
Available-for-sale securities pledged as collateral		108,300	87,100
Trust Deposits
Available-for-sale:
Available-for-sale securities pledged as collateral		822	840
Internal checking account
Available-for-sale:
Available-for-sale securities pledged as collateral		$ 2,100	$ 1,100

Investment Securities - Other T

Investment Securities - Other Than Temporarily Impaired Debt Securities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)security	Dec. 31, 2015USD ($)security	Dec. 31, 2014USD ($)
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	$ 0	$ 13
Number of investment securities in unrealized loss positions | security	134	54
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Held-to-maturity, Less than 12 continuous months, Fair value	$ 9,130	$ 14,152
Held-to-maturity, Less than 12 continuous months, Unrealized loss	(161)	(41)
Held-to-maturity, Greater than 12 continuous months, Fair value	0	1,999
Held-to-maturity, Greater than 12 continuous months, Unrealized loss	0	(1)
Held-to-maturity, Total securities in a loss position, Fair value	9,130	16,151
Held-to-maturity, Total securities in a loss position, Unrealized loss	(161)	(42)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale, Less than 12 continuous months, Fair value	284,314	221,857
Available-for-sale, Less than 12 continuous months, Unrealized loss	(6,197)	(1,273)
Available-for-sale, Greater than 12 continuous months, Fair value	9,946	17,987
Available-for-sale, Greater than 12 continuous months, Unrealized loss	(52)	(233)
Available-for-sale, Total securities in a loss position, Fair value	294,260	239,844
Available-for-sale, Total securities in a loss position, Unrealized loss	(6,249)	(1,506)
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	293,444	236,009
Total temporarily impaired securities, Less than 12 continuous months, Unrealized loss	(6,358)	(1,314)
Total temporarily impaired securities, Greater than 12 continuous months, Fair value	9,946	19,986
Total temporarily impaired securities, Greater than 12 continuous months, Unrealized loss	(52)	(234)
Total temporarily impaired securities, Total securities in a loss position, Fair value	303,390	255,995
Total temporarily impaired securities, Total securities in a loss position, Unrealized loss	$ (6,410)	(1,548)
Number of securities in continuous loss position for more than 12 months | security	1
Number of securities in continuous loss position for less than 12 months | security	133
Net loss on sale of available for sale securities sold	$ 64	1	$ 28
MBS pass-through securities
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale, Less than 12 continuous months, Fair value	162,016	68,809
Available-for-sale, Less than 12 continuous months, Unrealized loss	(3,577)	(454)
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	162,016	68,809
Available-for-sale, Total securities in a loss position, Unrealized loss	$ (3,577)	(454)
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] [Abstract]
Number of securities in continuous loss position for less than 12 months | security	31
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 less than 12 months | security	13
CMOs issued by FNMA
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale, Less than 12 continuous months, Fair value	$ 9,498	9,277
Available-for-sale, Less than 12 continuous months, Unrealized loss	(109)	(80)
Available-for-sale, Greater than 12 continuous months, Fair value		3,158
Available-for-sale, Greater than 12 continuous months, Unrealized loss		(64)
Available-for-sale, Total securities in a loss position, Fair value	9,498	12,435
Available-for-sale, Total securities in a loss position, Unrealized loss	(109)	(144)
CMOs issued by FHLMC
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale, Less than 12 continuous months, Fair value	31,545	0
Available-for-sale, Less than 12 continuous months, Unrealized loss	(731)	0
Available-for-sale, Greater than 12 continuous months, Fair value		1,989
Available-for-sale, Greater than 12 continuous months, Unrealized loss		(39)
Available-for-sale, Total securities in a loss position, Fair value	31,545	1,989
Available-for-sale, Total securities in a loss position, Unrealized loss	(731)	(39)
CMOs issued by GNMA
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale, Less than 12 continuous months, Fair value	1,583	164
Available-for-sale, Less than 12 continuous months, Unrealized loss	(1)	0
Available-for-sale, Greater than 12 continuous months, Fair value		2,374
Available-for-sale, Greater than 12 continuous months, Unrealized loss		(15)
Available-for-sale, Total securities in a loss position, Fair value	1,583	2,538
Available-for-sale, Total securities in a loss position, Unrealized loss	(1)	(15)
Debentures of government-sponsored agencies
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale, Less than 12 continuous months, Fair value	19,951	136,064
Available-for-sale, Less than 12 continuous months, Unrealized loss	(38)	(713)
Available-for-sale, Greater than 12 continuous months, Fair value	9,946	9,887
Available-for-sale, Greater than 12 continuous months, Unrealized loss	(52)	(113)
Available-for-sale, Total securities in a loss position, Fair value	29,897	145,951
Available-for-sale, Total securities in a loss position, Unrealized loss	$ (90)	(826)
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] [Abstract]
Number of securities in continuous loss position for less than 12 months | security	1
Obligations of state and political subdivisions
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale, Less than 12 continuous months, Fair value	$ 59,567	4,557
Available-for-sale, Less than 12 continuous months, Unrealized loss	(1,740)	(15)
Available-for-sale, Greater than 12 continuous months, Fair value		579
Available-for-sale, Greater than 12 continuous months, Unrealized loss		(2)
Available-for-sale, Total securities in a loss position, Fair value	59,567	5,136
Available-for-sale, Total securities in a loss position, Unrealized loss	$ (1,740)	(17)
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] [Abstract]
Number of securities in continuous loss position for less than 12 months | security	86
Corporate bonds
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale, Less than 12 continuous months, Fair value		2,986
Available-for-sale, Less than 12 continuous months, Unrealized loss		(11)
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		2,986
Available-for-sale, Total securities in a loss position, Unrealized loss		(11)
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] [Abstract]
Number of securities in continuous loss position for less than 12 months | security	1
Privately-issued CMOs
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale, Less than 12 continuous months, Fair value	$ 154
Available-for-sale, Less than 12 continuous months, Unrealized loss	(1)
Available-for-sale, Greater than 12 continuous months, Fair value
Available-for-sale, Greater than 12 continuous months, Unrealized loss
Available-for-sale, Total securities in a loss position, Fair value	154
Available-for-sale, Total securities in a loss position, Unrealized loss	$ (1)
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] [Abstract]
Number of securities in continuous loss position for less than 12 months | security	1
MBS pass-through securities
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Held-to-maturity, Less than 12 continuous months, Fair value	$ 2,250	2,332
Held-to-maturity, Less than 12 continuous months, Unrealized loss	(154)	(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	2,250	2,332
Held-to-maturity, Total securities in a loss position, Unrealized loss	(154)	(7)
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	3,362	8,297
Held-to-maturity, Less than 12 continuous months, Unrealized loss	(6)	(19)
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	3,362	8,297
Held-to-maturity, Total securities in a loss position, Unrealized loss	(6)	(19)
Corporate bonds
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Held-to-maturity, Less than 12 continuous months, Fair value	3,518	3,523
Held-to-maturity, Less than 12 continuous months, Unrealized loss	(1)	(15)
Held-to-maturity, Greater than 12 continuous months, Fair value		1,999
Held-to-maturity, Greater than 12 continuous months, Unrealized loss		(1)
Held-to-maturity, Total securities in a loss position, Fair value	3,518	5,522
Held-to-maturity, Total securities in a loss position, Unrealized loss	$ (1)	$ (16)

Investment Securities - Non-mar

Investment Securities - Non-marketable Securities (Details)	12 Months Ended
	Dec. 31, 2016USD ($)$ / sharesshares	Feb. 21, 2017	Dec. 31, 2015USD ($)
Schedule of Cost-method Investments [Line Items]
Federal Home Loan Bank stock, par value (usd per share) | $ / shares	$ 100
Investments in low income housing tax credit funds	$ 2,500,000		$ 2,700,000
Low income housing tax credits and other tax benefits	297,000
Low income housing amortization expense	236,000
Unfunded commitments for low income housing tax credit funds	$ 1,400,000
Subsequent event
Schedule of Cost-method Investments [Line Items]
Federal Home Loan Bank, dividend rate percentage		9.08%
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		2,200,000
Conversion ratio for common stock	1.6483
Other assets
Schedule of Cost-method Investments [Line Items]
Federal Home Loan Bank stock	$ 10,200,000		$ 8,400,000

Loans and Allowance for Loan 48

Loans and Allowance for Loan Losses - Percentage of Loans Geographically and by Collateral (Details)	Dec. 31, 2016	Dec. 31, 2015
Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loans by class to all loans	65.00%
Commercial real estate loans | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loans by class and geographic location	83.00%
Loans secured by real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loans by class to all loans	85.00%	85.00%

Loans and Allowance for Loan 49

Loans and Allowance for Loan Losses - Loans Outstanding and Aging Analysis (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	$ 502,000	$ 2,224,000
Current	1,486,114,000	1,449,004,000
Total loans	1,486,616,000	1,451,228,000
Non-accrual loans	145,000	2,179,000
Purchased Credit Impaired (PCI) loans no longer accreting interest	0	1,000
Purchased Credit-impaired (PCI) loans accreting interest	2,900,000	3,700,000
Deferred loan fees	883,000	768,000
Unaccreted purchase discounts on non-PCI loans	1,800,000	3,200,000
30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	362,000	1,382,000
60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	49,000	722,000
90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	91,000	120,000
Commercial loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	283,000	57,000
Current	218,332,000	219,395,000
Total loans	218,615,000	219,452,000
Non-accrual loans	0	21,000
Commercial loans | Commercial and industrial | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	283,000	36,000
Commercial loans | Commercial and industrial | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0	0
Commercial loans | Commercial and industrial | 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0	21,000
Commercial real estate loans | Commercial real estate, owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0	0
Current	247,713,000	242,309,000
Total loans	247,713,000	242,309,000
Non-accrual loans	0	0
Commercial real estate loans | Commercial real estate, owner-occupied | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0	0
Commercial real estate loans | Commercial real estate, owner-occupied | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0	0
Commercial real estate loans | Commercial real estate, owner-occupied | 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0	0
Commercial real estate loans | Commercial real estate, investor
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0	1,096,000
Current	724,228,000	714,783,000
Total loans	724,228,000	715,879,000
Non-accrual loans	0	1,903,000
Commercial real estate loans | Commercial real estate, investor | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0	1,096,000
Commercial real estate loans | Commercial real estate, investor | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0	0
Commercial real estate loans | Commercial real estate, investor | 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0	0
Commercial real estate loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0	1,000
Current	74,809,000	65,494,000
Total loans	74,809,000	65,495,000
Non-accrual loans	0	1,000
Commercial real estate loans | Construction | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0	1,000
Commercial real estate loans | Construction | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0	0
Commercial real estate loans | Construction | 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0	0
Residential loans | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	168,000	732,000
Current	117,039,000	111,568,000
Total loans	117,207,000	112,300,000
Non-accrual loans	91,000	171,000
Residential loans | Home equity | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	77,000	0
Residential loans | Home equity | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due		633,000
Residential loans | Home equity | 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	91,000	99,000
Residential loans | Other residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0	0
Current	78,549,000	73,154,000
Total loans	78,549,000	73,154,000
Non-accrual loans	0	0
Residential loans | Other residential | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0	0
Residential loans | Other residential | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0	0
Residential loans | Other residential | 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	0	0
Consumer loans | Installment and other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	51,000	338,000
Current	25,444,000	22,301,000
Total loans	25,495,000	22,639,000
Non-accrual loans	54,000	83,000
Consumer loans | Installment and other consumer | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	2,000	249,000
Consumer loans | Installment and other consumer | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	49,000	89,000
Consumer loans | Installment and other consumer | 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	$ 0	$ 0

Loans and Allowance for Loan 50

Loans and Allowance for Loan Losses - Credit Risk Profile by Internally Assigned Risk Grade (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 1,486,616	$ 1,451,228
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,451,049	1,392,597
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	15,937	36,300
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	19,630	22,331
Commercial loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	218,575	219,277
Total loans	218,615	219,452
Commercial loans | Pass | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	201,987	192,560
Commercial loans | Special Mention | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	9,197	22,457
Commercial loans | Substandard | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	7,391	4,260
Commercial real estate loans | Commercial real estate, owner-occupied
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	246,641	240,598
Total loans	247,713	242,309
Commercial real estate loans | Commercial real estate, investor
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	722,522	714,153
Total loans	724,228	715,879
Commercial real estate loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	74,809	65,494
Total loans	74,809	65,495
Commercial real estate loans | Pass | Commercial real estate, owner-occupied
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	234,849	219,060
Commercial real estate loans | Pass | Commercial real estate, investor
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	720,417	710,042
Commercial real estate loans | Pass | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	71,564	62,255
Commercial real estate loans | Special Mention | Commercial real estate, owner-occupied
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	4,799	12,371
Commercial real estate loans | Special Mention | Commercial real estate, investor
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	607	372
Commercial real estate loans | Special Mention | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	0	0
Commercial real estate loans | Substandard | Commercial real estate, owner-occupied
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	6,993	9,167
Commercial real estate loans | Substandard | Commercial real estate, investor
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	1,498	3,739
Commercial real estate loans | Substandard | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	3,245	3,239
Residential loans | Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	117,105	112,232
Total loans	117,207	112,300
Residential loans | Other residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	78,549	73,154
Residential loans | Pass | Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	115,680	109,959
Residential loans | Pass | Other residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	78,549	73,154
Residential loans | Special Mention | Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	1,334	1,100
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	91	1,173
Residential loans | Substandard | Other residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Consumer loans | Installment and other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	25,495	22,639
Consumer loans | Pass | Installment and other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	25,083	22,307
Consumer loans | Special Mention | Installment and other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Consumer loans | Substandard | Installment and other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	412	332
Receivables Acquired with Deteriorated Credit Quality
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	2,920	3,681
Receivables Acquired with Deteriorated Credit Quality | Pass
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	2,920	3,260
Receivables Acquired with Deteriorated Credit Quality | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	0	0
Receivables Acquired with Deteriorated Credit Quality | Substandard
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	0	421
Receivables Acquired with Deteriorated Credit Quality | Commercial loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	40	175
Receivables Acquired with Deteriorated Credit Quality | Commercial real estate loans | Commercial real estate, owner-occupied
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	1,072	1,711
Receivables Acquired with Deteriorated Credit Quality | Commercial real estate loans | Commercial real estate, investor
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	1,706	1,726
Receivables Acquired with Deteriorated Credit Quality | Commercial real estate loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	0	1
Receivables Acquired with Deteriorated Credit Quality | Residential loans | Home equity
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	102	68
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 51

Loans and Allowance for Loan Losses - Troubled Debt Restructuring by Class (Details)	12 Months Ended
	Dec. 31, 2016USD ($)loans	Dec. 31, 2015USD ($)loans	Dec. 31, 2014USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans removed from TDR resignation | loans	0	5
Recorded investment of loans removed from TDR resignation		$ 1,600,000
Recorded investment in Troubled Debt Restructurings	$ 18,168,000	19,081,000
TDR loans accruing interest as of period end	0	72,000
Acquired loans included in TDR	0	$ 137,000
Number of loans transferred to loans held-for-sale | loans		1
Charge-off on loan transferred to held-for-sale	36,000	$ 864,000	$ 277,000
Gain (loss) on transfer of loans to held-for-sale		0
Commercial loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment in Troubled Debt Restructurings	2,207,000	4,698,000
Charge-off on loan transferred to held-for-sale	11,000	5,000	66,000
Commercial real estate loans | Commercial real estate, owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment in Troubled Debt Restructurings	6,993,000	6,993,000
Charge-off on loan transferred to held-for-sale	20,000	0	0
Commercial real estate loans | Commercial real estate, investor
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment in Troubled Debt Restructurings	2,256,000	514,000
Charge-off on loan transferred to held-for-sale	0	0	0
Commercial real estate loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment in Troubled Debt Restructurings	3,245,000	3,238,000
Loans reclassified to held-for-sale		1,500,000
Charge-off on loan transferred to held-for-sale	0	839,000	204,000
Residential loans | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment in Troubled Debt Restructurings	625,000	460,000
Charge-off on loan transferred to held-for-sale	0	0	0
Residential loans | Other residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment in Troubled Debt Restructurings	1,965,000	2,010,000
Charge-off on loan transferred to held-for-sale	0	0	0
Consumer loans | Installment and other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment in Troubled Debt Restructurings	877,000	1,168,000
Charge-off on loan transferred to held-for-sale	$ 5,000	$ 20,000	$ 7,000

Loans and Allowance for Loan 52

Loans and Allowance for Loan Losses - Troubled Debt Restructuring Modifications (Details)	12 Months Ended
	Dec. 31, 2016USD ($)contract	Dec. 31, 2015USD ($)contract	Dec. 31, 2014USD ($)contract
Financing Receivable, Modifications [Line Items]
Number of Contracts Modified | contract	4		17
Pre-Modification Outstanding Recorded Investment	$ 1,985,000		$ 6,734,000
Post-Modification Outstanding Recorded Investment	2,115,000		7,288,000
Post-Modification Outstanding Recorded Investment at Period End	2,063,000		7,223,000
Total of TDR loans charged-off within previous 12 months	$ 0	$ 0	$ 0
Residential loans | Home equity
Financing Receivable, Modifications [Line Items]
Number of Contracts Modified | contract	1
Pre-Modification Outstanding Recorded Investment	$ 87,000
Post-Modification Outstanding Recorded Investment	222,000
Post-Modification Outstanding Recorded Investment at Period End	$ 245,000
Commercial loans | Commercial real estate, investor
Financing Receivable, Modifications [Line Items]
Number of Contracts Modified | contract	2		2
Pre-Modification Outstanding Recorded Investment	$ 1,830,000		$ 224,000
Post-Modification Outstanding Recorded Investment	1,826,000		224,000
Post-Modification Outstanding Recorded Investment at Period End	$ 1,752,000		$ 220,000
Commercial loans | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Contracts Modified | contract		7	6
Pre-Modification Outstanding Recorded Investment		$ 3,271,000	$ 1,039,000
Post-Modification Outstanding Recorded Investment		3,251,000	1,258,000
Post-Modification Outstanding Recorded Investment at Period End		$ 2,811,000	$ 1,251,000
Commercial real estate loans | Commercial real estate, owner-occupied
Financing Receivable, Modifications [Line Items]
Number of Contracts Modified | contract			1
Pre-Modification Outstanding Recorded Investment			$ 4,226,000
Post-Modification Outstanding Recorded Investment			4,216,000
Post-Modification Outstanding Recorded Investment at Period End			$ 4,175,000
Commercial real estate loans | Construction
Financing Receivable, Modifications [Line Items]
Number of Contracts Modified | contract			2
Pre-Modification Outstanding Recorded Investment			$ 964,000
Post-Modification Outstanding Recorded Investment			1,312,000
Post-Modification Outstanding Recorded Investment at Period End			$ 1,309,000
Consumer loans | Installment and other consumer
Financing Receivable, Modifications [Line Items]
Number of Contracts Modified | contract	1		6
Pre-Modification Outstanding Recorded Investment	$ 68,000		$ 281,000
Post-Modification Outstanding Recorded Investment	67,000		278,000
Post-Modification Outstanding Recorded Investment at Period End	$ 66,000		$ 268,000

Loans and Allowance for Loan 53

Loans and Allowance for Loan Losses - Impaired Loans and Related Allowance (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Recorded investment in impaired loans:
With no specific allowance recorded	$ 4,209,000	$ 12,928,000
With a specific allowance recorded	14,104,000	8,260,000
Total recorded investment in impaired loans	18,313,000	21,188,000
Unpaid principal balance of impaired loans:
Total unpaid principal balance of impaired loans	18,270,000	23,409,000
Specific valuation	991,000	1,169,000
Average recorded investment in impaired loans during the period	20,835,000	23,273,000	$ 25,909,000
Interest income recognized on impaired loans	2,223,000	826,000	948,000
Charged-off portion of impaired loans	0	2,100,000
Outstanding commitments to extend credit on impaired loans	1,600,000	1,300,000
Interest income recognized on impaired loans during the period ended, cash basis	1,400,000	0	0
Commercial loans | Commercial and industrial
Recorded investment in impaired loans:
With no specific allowance recorded	315,000	2,198,000
With a specific allowance recorded	1,892,000	2,522,000
Total recorded investment in impaired loans	2,207,000	4,720,000
Unpaid principal balance of impaired loans:
Total unpaid principal balance of impaired loans	2,177,000	4,763,000
Specific valuation	285,000	912,000
Average recorded investment in impaired loans during the period	3,514,000	4,237,000	5,354,000
Interest income recognized on impaired loans	175,000	238,000	378,000
Commercial real estate loans | Commercial real estate, owner-occupied
Recorded investment in impaired loans:
With no specific allowance recorded	0	4,111,000
With a specific allowance recorded	6,993,000	2,882,000
Total recorded investment in impaired loans	6,993,000	6,993,000
Unpaid principal balance of impaired loans:
Total unpaid principal balance of impaired loans	6,993,000	6,993,000
Specific valuation	163,000	70,000
Average recorded investment in impaired loans during the period	7,069,000	7,886,000	6,604,000
Interest income recognized on impaired loans	199,000	295,000	288,000
Commercial real estate loans | Commercial real estate, investor
Recorded investment in impaired loans:
With no specific allowance recorded	0	2,416,000
With a specific allowance recorded	2,256,000	0
Total recorded investment in impaired loans	2,256,000	2,416,000
Unpaid principal balance of impaired loans:
Total unpaid principal balance of impaired loans	2,252,000	4,408,000
Specific valuation	375,000	0
Average recorded investment in impaired loans during the period	2,950,000	2,833,000	3,138,000
Interest income recognized on impaired loans	1,514,000	33,000	28,000
Commercial real estate loans | Construction
Recorded investment in impaired loans:
With no specific allowance recorded	2,692,000	2,687,000
With a specific allowance recorded	553,000	551,000
Total recorded investment in impaired loans	3,245,000	3,238,000
Unpaid principal balance of impaired loans:
Total unpaid principal balance of impaired loans	3,238,000	3,424,000
Specific valuation	8,000	1,000
Average recorded investment in impaired loans during the period	3,242,000	4,164,000	6,471,000
Interest income recognized on impaired loans	137,000	86,000	85,000
Residential loans | Home equity
Recorded investment in impaired loans:
With no specific allowance recorded	91,000	171,000
With a specific allowance recorded	624,000	388,000
Total recorded investment in impaired loans	715,000	559,000
Unpaid principal balance of impaired loans:
Total unpaid principal balance of impaired loans	713,000	559,000
Specific valuation	7,000	3,000
Average recorded investment in impaired loans during the period	945,000	602,000	741,000
Interest income recognized on impaired loans	60,000	18,000	19,000
Residential loans | Other residential
Recorded investment in impaired loans:
With no specific allowance recorded	1,008,000	1,214,000
With a specific allowance recorded	957,000	797,000
Total recorded investment in impaired loans	1,965,000	2,011,000
Unpaid principal balance of impaired loans:
Total unpaid principal balance of impaired loans	1,965,000	2,011,000
Specific valuation	55,000	67,000
Average recorded investment in impaired loans during the period	1,988,000	2,028,000	1,744,000
Interest income recognized on impaired loans	90,000	92,000	74,000
Consumer loans | Installment and other consumer
Recorded investment in impaired loans:
With no specific allowance recorded	103,000	131,000
With a specific allowance recorded	829,000	1,120,000
Total recorded investment in impaired loans	932,000	1,251,000
Unpaid principal balance of impaired loans:
Total unpaid principal balance of impaired loans	932,000	1,251,000
Specific valuation	98,000	116,000
Average recorded investment in impaired loans during the period	1,127,000	1,523,000	1,857,000
Interest income recognized on impaired loans	$ 48,000	$ 64,000	$ 76,000

Loans and Allowance for Loan 54

Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 14,999	$ 15,099	$ 14,224
Provision (reversal)	(1,850)	500	750
Charge-offs	(36)	(864)	(277)
Recoveries	2,329	264	402
Ending balance	15,442	14,999	15,099
Ending ALLL related to loans collectively evaluated for impairment	14,451	13,830
Ending ALLL related to loans individually evaluated for impairment	991	1,160
Ending ALLL	15,442	14,999
Collectively evaluated for impairment	1,465,383	1,426,497
Individually evaluated for impairment	18,313	21,050
Total loans	$ 1,486,616	$ 1,451,228
Ratio of allowance for loan losses to total loans	1.04%	1.03%
Allowance for loan losses to non-accrual loans	10650.00%	688.00%
PCI loans impaired post-acquisition		$ 138
Receivables Acquired with Deteriorated Credit Quality
Allowance for Loan and Lease Losses [Roll Forward]
Ending ALLL	$ 0	9
Purchased credit-impaired	2,920	3,681
Commercial loans | Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,023	2,837	3,056
Provision (reversal)	93	(45)	(321)
Charge-offs	(11)	(5)	(66)
Recoveries	143	236	168
Ending balance		3,023	2,837
Ending ALLL related to loans collectively evaluated for impairment	2,963	2,111
Ending ALLL related to loans individually evaluated for impairment	285	904
Ending ALLL	3,248	3,023
Collectively evaluated for impairment	216,368	214,695
Individually evaluated for impairment	2,207	4,582
Total loans	$ 218,615	$ 219,452
Ratio of allowance for loan losses to total loans	1.49%	1.38%
Allowance for loan losses to non-accrual loans		14395.00%
Commercial loans | Commercial and industrial | Receivables Acquired with Deteriorated Credit Quality
Allowance for Loan and Lease Losses [Roll Forward]
Ending ALLL	$ 0	$ 8
Purchased credit-impaired	40	175
Commercial real estate loans | Commercial real estate, owner-occupied
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,249	1,924	2,012
Provision (reversal)	(476)	325	(93)
Charge-offs	(20)	0	0
Recoveries	0	0	5
Ending balance		2,249	1,924
Ending ALLL related to loans collectively evaluated for impairment	1,590	2,179
Ending ALLL related to loans individually evaluated for impairment	163	70
Ending ALLL	1,753	2,249
Collectively evaluated for impairment	239,648	233,605
Individually evaluated for impairment	6,993	6,993
Total loans	$ 247,713	$ 242,309
Ratio of allowance for loan losses to total loans	0.71%	0.93%
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	1,072	1,711
Commercial real estate loans | Commercial real estate, investor
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	6,178	6,672	6,196
Provision (reversal)	(2,014)	(517)	431
Charge-offs	0	0	0
Recoveries	2,156	23	45
Ending balance		6,178	6,672
Ending ALLL related to loans collectively evaluated for impairment	5,945	6,178
Ending ALLL related to loans individually evaluated for impairment	375	0
Ending ALLL	6,320	6,178
Collectively evaluated for impairment	720,266	711,737
Individually evaluated for impairment	2,256	2,416
Total loans	$ 724,228	$ 715,879
Ratio of allowance for loan losses to total loans	0.87%	0.86%
Allowance for loan losses to non-accrual loans		325.00%
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	1,706	1,726
Commercial real estate loans | Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	724	839	633
Provision (reversal)	57	724	314
Charge-offs	0	(839)	(204)
Recoveries	0	0	96
Ending balance		724	839
Ending ALLL related to loans collectively evaluated for impairment	773	723
Ending ALLL related to loans individually evaluated for impairment	8	0
Ending ALLL	781	724
Collectively evaluated for impairment	71,564	62,256
Individually evaluated for impairment	3,245	3,238
Total loans	$ 74,809	$ 65,495
Ratio of allowance for loan losses to total loans	1.04%	1.11%
Allowance for loan losses to non-accrual loans		72400.00%
Commercial real estate loans | Construction | Receivables Acquired with Deteriorated Credit Quality
Allowance for Loan and Lease Losses [Roll Forward]
Ending ALLL	$ 0	$ 1
Purchased credit-impaired	0	1
Residential loans | Home equity
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	910	859	875
Provision (reversal)	60	48	(19)
Charge-offs	0	0	0
Recoveries	3	3	3
Ending balance		910	859
Ending ALLL related to loans collectively evaluated for impairment	966	907
Ending ALLL related to loans individually evaluated for impairment	7	3
Ending ALLL	973	910
Collectively evaluated for impairment	116,390	111,673
Individually evaluated for impairment	715	559
Total loans	$ 117,207	$ 112,300
Ratio of allowance for loan losses to total loans	0.83%	0.81%
Allowance for loan losses to non-accrual loans	1071.00%	532.00%
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	102	68
Residential loans | Other residential
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	394	433	317
Provision (reversal)	60	(39)	116
Charge-offs	0	0	0
Recoveries	0	0	0
Ending balance		394	433
Ending ALLL related to loans collectively evaluated for impairment	399	327
Ending ALLL related to loans individually evaluated for impairment	55	67
Ending ALLL	454	394
Collectively evaluated for impairment	76,584	71,143
Individually evaluated for impairment	1,965	2,011
Total loans	$ 78,549	$ 73,154
Ratio of allowance for loan losses to total loans	0.58%	0.54%
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	425	566	629
Provision (reversal)	(75)	(123)	(141)
Charge-offs	(5)	(20)	(7)
Recoveries	27	2	85
Ending balance		425	566
Ending ALLL related to loans collectively evaluated for impairment	274	309
Ending ALLL related to loans individually evaluated for impairment	98	116
Ending ALLL	372	425
Collectively evaluated for impairment	24,563	21,388
Individually evaluated for impairment	932	1,251
Total loans	$ 25,495	$ 22,639
Ratio of allowance for loan losses to total loans	1.46%	1.88%
Allowance for loan losses to non-accrual loans	683.00%	512.00%
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	1,096	969	506
Provision (reversal)	445	127	463
Charge-offs	0	0	0
Recoveries	0	0	0
Ending balance		1,096	$ 969
Ending ALLL related to loans collectively evaluated for impairment	1,541	1,096
Ending ALLL related to loans individually evaluated for impairment	0	0
Ending ALLL	1,541	1,096
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 55

Loans and Allowance for Loan Losses - Purchased Credit-Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
PCI Loans, Carrying Value [Abstract]
Unpaid principal balance	$ 3,350	$ 4,977
Carrying value	2,920	3,681
Increase of specific allowance for PCI loan losses		4	$ 3
Decrease in allowance for loan losses for PCI loans	6	2	238
Accretable Yield [Roll Forward]
Balance at beginning of period	2,618	4,027	3,649
Additions	0	0	0
Removals	(778)	(914)	(273)
Accretion	(364)	(495)	(613)
Reclassifications from nonaccretable difference	0	0	1,264
Balance at end of period	1,476	2,618	$ 4,027
Commercial loans | Commercial and industrial
PCI Loans, Carrying Value [Abstract]
Unpaid principal balance	45	237
Carrying value	40	175
Commercial real estate loans | Commercial real estate, owner-occupied
PCI Loans, Carrying Value [Abstract]
Unpaid principal balance	1,344	2,573
Carrying value	1,072	1,711
Commercial real estate loans | Commercial real estate, investor
PCI Loans, Carrying Value [Abstract]
Unpaid principal balance	1,713	1,756
Carrying value	1,706	1,726
Commercial real estate loans | Construction
PCI Loans, Carrying Value [Abstract]
Unpaid principal balance	0	187
Carrying value	0	1
Residential loans | Home equity
PCI Loans, Carrying Value [Abstract]
Unpaid principal balance	248	224
Carrying value	$ 102	$ 68

Loans and Allowance for Loan 56

Loans and Allowance for Loan Losses - Pledged Loans (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Financial Instruments Owned and Pledged as Collateral [Line Items]
Certain qualifying loans pledged for FHLB line of credit	$ 869.2	$ 833.8
Other residential
Financial Instruments Owned and Pledged as Collateral [Line Items]
Residential loans pledged for FRB borrowings	$ 54.6	$ 45.2

Loans and Allowance for Loan 57

Loans and Allowance for Loan Losses - Related Party Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loans and Leases Receivable, Related Parties [Roll Forward]
Balance at beginning of year	$ 2,562	$ 3,329	$ 3,749
Additions	0	0	0
Advances	0	165	0
Repayments	(574)	(390)	(420)
Reclassified as unrelated-party loan due to a change in borrower status	0	(542)	0
Balance at end of year	1,988	2,562	$ 3,329
Directors, Officers, Principal Shareholders and Associates
Related Party Transaction [Line Items]
Undisbursed commitment to related parties	$ 1,100	$ 1,000

Bank Premises and Equipment (De

Bank Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Bank premises and equipment, Gross	$ 24,510	$ 23,502
Accumulated depreciation and amortization	(15,990)	(14,197)
Bank premises and equipment, net	8,520	9,305
Depreciation and amortization	1,800	2,000	$ 1,600
Leasehold improvements
Property, Plant and Equipment [Line Items]
Bank premises and equipment, Gross	13,883	13,615
Furniture and equipment
Property, Plant and Equipment [Line Items]
Bank premises and equipment, Gross	$ 10,627	$ 9,887

Bank Owned Life Insurance (Deta

Bank Owned Life Insurance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Insurance [Abstract]
Estimated death benefits	$ 71,000
Death benefits provided under terms of the programs	32,400	$ 29,500
Earnings on bank-owned life Insurance	$ 844	$ 814	$ 841

Deposits - Stratification of Ti

Deposits - Stratification of Time Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Banking and Thrift [Abstract]
Time deposits of less than $100 thousand	$ 36,346	$ 39,534
Time deposits of $100 thousand to $250 thousand	66,092	67,352
Time deposits of more than $250 thousand	49,025	54,571
Time accounts	$ 151,463	$ 161,457

Deposits - Narrative (Details)

Deposits - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Banking and Thrift [Abstract]
Interest on time accounts	$ 743	$ 853	$ 917
Held-to-maturity securities pledged as collateral	36,400
Available-for-sale securities pledged as collateral	71,900
CDARS balance in reciprocal deposit program	15,100	14,300
ICS balance in reciprocal deposit program	29,000	12,200
DDM balance in reciprocal deposit program	36,400
One-way CDARS deposits	361	355
Deposit overdrafts reclassified as loan balances	229	84
Related party deposit liabilities	$ 7,300	$ 8,300

Deposits - Time Deposit Maturit

Deposits - Time Deposit Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Maturities of Time Deposits [Abstract]
2,017	$ 104,616
2,018	12,325
2,019	7,891
2,020	7,246
2,021	19,385
Thereafter	0
Time accounts	$ 151,463	$ 161,457

Borrowings - Lines of Credit an

Borrowings - Lines of Credit and Borrowing Agreements (Details) - USD ($)	Jun. 15, 2016	Feb. 05, 2008	Dec. 31, 2016	Dec. 31, 2015
Line of Credit | Federal Home Loan Bank Borrowings
Line of Credit Facility [Line Items]
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%
Amount of FHLB borrowings outstanding			$ 0	$ 15,000,000
Line of Credit | Federal Home Loan Bank
Line of Credit Facility [Line Items]
Lines of credit			513,700,000	470,600,000
Remaining available line of credit from FHLB			513,700,000	403,400,000
Line of Credit | Federal Home Loan Bank Borrowings [Member]
Line of Credit Facility [Line Items]
Amount of debt repaid	$ 15,000,000
Line of Credit | Federal Home Loan Bank Borrowings [Member] | Interest expense
Line of Credit Facility [Line Items]
Prepayment fee on debt repaid	$ 312,000
Letters of credit | Federal Home Loan Bank
Line of Credit Facility [Line Items]
Remaining available line of credit from FHLB				241,000
Federal Funds Purchased | Line of Credit
Line of Credit Facility [Line Items]
Lines of credit			92,000,000	92,000,000
Short-term Debt			0	0
Federal Home Loan Bank Overnight Borrowings | Line of Credit
Line of Credit Facility [Line Items]
Short-term Debt			0	$ 52,000,000
Effective interest rate at period end				0.27%
Federal Home Loan Bank Borrowings | Line of Credit
Line of Credit Facility [Line Items]
Short-term Debt			0	$ 52,000,000
Federal Reserve Line of Credit | Line of Credit
Line of Credit Facility [Line Items]
Lines of credit			43,100,000	37,800,000
Amount of FHLB borrowings outstanding			$ 0	$ 0

Borrowings - Subordinated Debt

Borrowings - Subordinated Debt (Details) $ in Thousands	Nov. 29, 2013USD ($)debenture	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Debt Instrument [Line Items]
Number of subordinated debentures acquired | debenture	2
Accretion of discount on subordinated debentures		$ 191	$ 210	$ 216
Amount guaranteed, on subordinated basis, distributions and other payments on trust preferred securities		8,000
Subordinated debentures		5,586	5,395
Subordinated debenture
Debt Instrument [Line Items]
Subordinated debenture	$ 4,950
Long-term Debt, Gross	$ 8,200	8,248
Accretion of discount on subordinated debentures		191	210	$ 216
Subordinated debentures		5,586	$ 5,395
Subordinated debenture | NorCal Community Bancorp Trust I
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 4,124
Effective interest rate		3.93%
Basis spread on subordinated debenture		3.05%
Subordinated debenture | NorCal Community Bancorp Trust II
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 4,124
Effective interest rate		2.36%
Basis spread on subordinated debenture		1.40%
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, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Subordinated debenture, Carrying Value	$ 5,586	$ 5,395
Subordinated debenture
Debt Instrument [Line Items]
Subordinated debenture, Carrying Value	5,586	5,395
Subordinated debenture, Average Balance	$ 5,493	$ 5,288
Borrowings, Average Rate	7.80%	7.94%
Line of Credit | Federal Home Loan Bank Borrowings
Debt Instrument [Line Items]
FHLB overnight borrowings and advances, Carrying Value	$ 0	$ 15,000
FHLB overnight borrowings and advances, Average Balance	$ 6,803	$ 15,000
Borrowings, Average Rate	6.59%	2.07%
Federal Home Loan Bank Borrowings | Line of Credit
Debt Instrument [Line Items]
Short-term Debt	$ 0	$ 52,000
FHLB overnight borrowings and advances, Average Balance	$ 5,383	$ 784
Borrowings, Average Rate	0.42%	0.38%

Stockholders' Equity and Stoc66

Stockholders' Equity and Stock Plans - Narrative (Details) $ / shares in Units, $ in Thousands	Jan. 20, 2017$ / shares	Sep. 30, 2015$ / sharesshares	Nov. 30, 2011investor	Dec. 31, 2016USD ($)$ / sharesshares	Dec. 31, 2015USD ($)$ / sharesshares	Dec. 31, 2014USD ($)shares	Jun. 17, 2016	May 11, 2010shares	Jul. 02, 2007	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 | $				$ 1,600
Total compensation cost for share-based payment arrangements | $				994	$ 636	$ 446
Share-based compensation income tax benefit recognized | $				318	194	128
Tax benefit realized from disqualifying dispositions of incentive stock options | $				$ 70	$ 49	76
Percentage of share ownership defining an acquiring person							10.00%		15.00%
Preferred stock, authorized (in shares)				5,000,000	5,000,000
Preferred stock, no par value (in dollars per share) | $ / shares				$ 0	$ 0
Subsequent event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends declared per common share (usd per share) | $ / shares	$ 0.27
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant-date fair value of option shares vested | $				$ 282	$ 202	187
Stock options | During 2006 through 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				5 years
Expiration period of grants				10 years
Stock options | During 2006 through 2014 | Vesting Rate, Year One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Stock options | During 2006 through 2014 | Vesting Rate, Year Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Stock options | During 2006 through 2014 | Vesting Rate, Year Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Stock options | During 2006 through 2014 | Vesting Rate Year Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Stock options | During 2006 through 2014 | Vesting Rate Year Five
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Stock options | Prior to 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				4 years
Expiration period of grants				7 years
Stock options | Prior to 2016 | Immediately Upon Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Stock options | Prior to 2016 | Vesting Rate, Year One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Stock options | Prior to 2016 | Vesting Rate, Year Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Stock options | Prior to 2016 | Vesting Rate, Year Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Stock options | Prior to 2016 | Vesting Rate Year Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Stock options | After 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				33.00%
Award vesting period				3 years
Expiration period of grants				10 years
Stock options | During 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				33.00%
Award vesting period				3 years
Expiration period of grants				10 years
Restricted stock award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant-date fair value of option shares vested | $				$ 380	$ 262	$ 227
Restricted stock award | During 2006 through 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				5 years
Expiration period of grants				10 years
Restricted stock award | During 2006 through 2014 | Vesting Rate, Year One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Restricted stock award | During 2006 through 2014 | Vesting Rate, Year Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Restricted stock award | During 2006 through 2014 | Vesting Rate, Year Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Restricted stock award | During 2006 through 2014 | Vesting Rate Year Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Restricted stock award | During 2006 through 2014 | Vesting Rate Year Five
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				3 years
Minimum | Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				0.00%
Maximum | Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				200.00%
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				113,842
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				155,750
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				192,965
Discount from closing market price at end of each quarter				5.00%
Employee Stock Purchase Plan, 2007 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Approved payroll deduction to purchase shares, percentage				1.00%
Employee Stock Purchase Plan, 2007 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Approved payroll deduction to purchase shares, percentage				15.00%
Former 1999 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted				0
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
Exercise price of warrant to purchase common stock | $ / shares		$ 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				4,607	5,295	5,306
Common Stock | U.S. Treasury Capital Purchase Program (TCPP)
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 Stoc67

Stockholders' Equity and Stock Plans - Options Outstanding Rollforward (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Number of Shares
Options outstanding, beginning balance (in shares)	185,269	194,672	220,456
Granted (in shares)	32,637	28,320	26,421
Cancelled, expired or forfeited (in shares)		(652)	(2,790)
Exercised (in shares)	(36,117)	(37,071)	(49,415)
Options outstanding, ending balance (in shares)	181,789	185,269	194,672	220,456
Exercisable (vested), ending balance (in shares)	103,211	114,581	133,153
Weighted Average Exercise Price
Options outstanding, beginning balance (usd per share)	$ 38.35	$ 35.14	$ 32.74
Granted (usd per share)	49.37	50.70	44.83
Cancelled, expired or forfeited (usd per share)		48.38	39.01
Exercised (usd per share)	33.98	30.72	29.39
Options outstanding, ending balance (usd per share)	41.20	38.35	35.14	$ 32.74
Exercisable (vested), ending balance (usd per share)	$ 36.65	$ 34.12	$ 32.31
Aggregate Intrinsic Value
Options outstanding, beginning balance	$ 2,788	$ 3,398	$ 2,349
Exercised	661	755	771
Options outstanding, ending balance	5,190	2,788	3,398	$ 2,349
Exercisable (vested) at year end	$ 3,416	$ 2,209	$ 2,701
Weighted Average Grant-Date Fair Value
Granted (usd per share)	$ 10.11	$ 12.21	$ 12.04
Weighted Average Remaining Contractual Term
Options outstanding (in years)	5 years 9 months 7 days	5 years	4 years 5 months 22 days	4 years 18 days
Exercisable (vested)	4 years 2 months 4 days	3 years 2 months 15 days	2 years 10 months 16 days

Stockholders' Equity and Stoc68

Stockholders' Equity and Stock Plans - Options Outstanding, Vested and Expected to Vest (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)$ / sharesshares
Equity [Abstract]
Number of options | shares	177,122
Weighted average exercise price (usd per share) | $ / shares	$ 41.03
Aggregate intrinsic value | $	$ 5,086
Weighted average remaining contractual term (in years)	5 years 8 months 16 days

Stockholders' Equity and Stoc69

Stockholders' Equity and Stock Plans - Non-vested Awards Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Number of Shares
Non-vested awards, beginning balance (in shares)	31,388	22,423	22,521
Granted (in shares)	16,910	15,970	8,523
Vested (in shares)	(8,599)	(6,555)	(6,554)
Forfeited (in shares)		(450)	(2,067)
Non-vested awards, ending balance (in shares)	39,699	31,388	22,423
Weighted Average Grant-Date Fair Value
Non-vested awards, beginning balance (usd per share)	$ 46.24	$ 41.25	$ 37.59
Granted (usd per share)	49.65	50.75	45.36
Vested (usd per share)	44.14	40	34.65
Forfeited (usd per share)		48.45	39.32
Non-vested awards, ending balance (usd per share)	$ 48.15	$ 46.24	$ 41.25

Stockholders' Equity and Stoc70

Stockholders' Equity and Stock Plans - Options Outstanding by Price Range (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options Outstanding (in shares)	181,789	185,269	194,672	220,456
Stock Options Outstanding, Remaining Contractual Life (in years)	5 years 9 months 7 days	5 years	4 years 5 months 22 days	4 years 18 days
Stock Options Outstanding, Weighted Average Exercise Price (usd per share)	$ 41.20	$ 38.35	$ 35.14	$ 32.74
$20.01 - $25.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Limit (usd per share)	20
Range of Exercise Prices, Upper Limit (usd per share)	25
$25.01 - $30.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Limit (usd per share)	25.01
Range of Exercise Prices, Upper Limit (usd per share)	30
$30.01 - $35.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Limit (usd per share)	30.01
Range of Exercise Prices, Upper Limit (usd per share)	35
$35.01 - $40.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Limit (usd per share)	35.01
Range of Exercise Prices, Upper Limit (usd per share)	40
$40.01 - $45.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Limit (usd per share)	40.01
Range of Exercise Prices, Upper Limit (usd per share)	45
$45.01 - $50.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Limit (usd per share)	45.01
Range of Exercise Prices, Upper Limit (usd per share)	50
$50.01 - $55.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Limit (usd per share)	50.01
Range of Exercise Prices, Upper Limit (usd per share)	$ 55
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options Outstanding (in shares)	181,789
Stock Options Outstanding, Remaining Contractual Life (in years)
Stock Options Exercisable (in shares)	103,211
Stock options | $20.01 - $25.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options Outstanding (in shares)	13,138
Stock Options Outstanding, Remaining Contractual Life (in years)	2 years 3 months 18 days
Stock Options Outstanding, Weighted Average Exercise Price (usd per share)	$ 22.25
Stock Options Exercisable (in shares)	13,138
Stock Options Exercisable, Weighted Average Exercise Price (usd per share)	$ 22.25
Stock options | $25.01 - $30.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options Outstanding (in shares)	10,180
Stock Options Outstanding, Remaining Contractual Life (in years)	1 year 3 months 18 days
Stock Options Outstanding, Weighted Average Exercise Price (usd per share)	$ 28.75
Stock Options Exercisable (in shares)	10,180
Stock Options Exercisable, Weighted Average Exercise Price (usd per share)	$ 28.75
Stock options | $30.01 - $35.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options Outstanding (in shares)	9,195
Stock Options Outstanding, Remaining Contractual Life (in years)	3 years 3 months 18 days
Stock Options Outstanding, Weighted Average Exercise Price (usd per share)	$ 33.10
Stock Options Exercisable (in shares)	9,195
Stock Options Exercisable, Weighted Average Exercise Price (usd per share)	$ 33.10
Stock options | $35.01 - $40.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options Outstanding (in shares)	46,588
Stock Options Outstanding, Remaining Contractual Life (in years)	4 years 1 month 6 days
Stock Options Outstanding, Weighted Average Exercise Price (usd per share)	$ 37.70
Stock Options Exercisable (in shares)	39,038
Stock Options Exercisable, Weighted Average Exercise Price (usd per share)	$ 37.48
Stock options | $40.01 - $45.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options Outstanding (in shares)	29,551
Stock Options Outstanding, Remaining Contractual Life (in years)	5 years 10 months 24 days
Stock Options Outstanding, Weighted Average Exercise Price (usd per share)	$ 41.95
Stock Options Exercisable (in shares)	17,130
Stock Options Exercisable, Weighted Average Exercise Price (usd per share)	$ 41.91
Stock options | $45.01 - $50.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options Outstanding (in shares)	45,187
Stock Options Outstanding, Remaining Contractual Life (in years)	8 years 8 months 12 days
Stock Options Outstanding, Weighted Average Exercise Price (usd per share)	$ 48.40
Stock Options Exercisable (in shares)	5,020
Stock Options Exercisable, Weighted Average Exercise Price (usd per share)	$ 45.88
Stock options | $50.01 - $55.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options Outstanding (in shares)	27,950
Stock Options Outstanding, Remaining Contractual Life (in years)	7 years 10 months 24 days
Stock Options Outstanding, Weighted Average Exercise Price (usd per share)	$ 50.70
Stock Options Exercisable (in shares)	9,510
Stock Options Exercisable, Weighted Average Exercise Price (usd per share)	$ 50.69

Stockholders' Equity and Stoc71

Stockholders' Equity and Stock Plans - Valuation Assumptions (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	1.37%	1.67%	2.04%
Expected dividend yield on common stock	2.02%	1.75%	1.70%
Expected life in years	6 years	6 years	6 years
Expected price volatility	25.56%	28.06%	30.32%

Stockholders' Equity and Stoc72

Stockholders' Equity and Stock Plans - Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity [Abstract]
Cash dividends to common stockholders	$ 6,223	$ 5,390	$ 4,733
Cash dividends paid per common share	$ 1.02	$ 0.90	$ 0.80
Retained earnings	$ 146,464	$ 129,553
Stockholders' equity	$ 230,563	$ 214,473	$ 200,026	$ 180,887
Period used to determine amount available for payment of dividends based on restriction (in years)	3 years
Amount of retained earnings available for payment of dividends based on restriction	$ 50,800
Cash held	$ 3,500

Fair Value of Assets and Liab73

Fair Value of Assets and Liabilities - Recorded on a Recurring Basis (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)security	Dec. 31, 2015USD ($)security
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 372,580	$ 417,787
Derivative financial assets (interest rate contracts)	55	3
Derivative financial liabilities (interest rate contracts)	$ 933	$ 1,658
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)	$ 55	$ 3
Derivative financial liabilities (interest rate contracts)	933	1,658
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)	55	3
Derivative financial liabilities (interest rate contracts)	933	1,658
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
Mortgage-backed securities and collaterized mortgage obligations issued by U.S. government 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]
Securities available for sale	254,041	190,093
Mortgage-backed securities and collaterized mortgage obligations issued by U.S. government 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]
Securities available for sale	0	0
Mortgage-backed securities and collaterized mortgage obligations issued by U.S. government 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]
Securities available for sale	253,434	188,381
Mortgage-backed securities and collaterized mortgage obligations issued by U.S. government 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]
Securities available for sale	607	1,712
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]
Securities available for sale	35,403	160,892
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]
Securities available for sale	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]
Securities available for sale	35,403	160,892
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]
Securities available for sale	0	0
Privately-issued CMOs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	419	4,150
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]
Securities available for sale	419	4,150
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]
Securities available for sale	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]
Securities available for sale	419	4,150
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]
Securities available for sale	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]
Securities available for sale	77,701	57,673
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]
Securities available for sale	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]
Securities available for sale	77,701	57,673
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]
Securities available for sale	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]
Securities available for sale	5,016	4,979
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]
Securities available for sale	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]
Securities available for sale	5,016	4,979
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]
Securities available for sale	0	$ 0
U.S. government agency obligation collateralized by loans guaranteed by SBA program
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Decrease in unrealized gain (loss) due to transfers to Level 3	$ 15

Fair Value of Assets and Liab74

Fair Value of Assets and Liabilities - Recorded on Nonrecurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate for selling costs applied to all properties	6.00%
Change in estimated fair value of OREO as of acquisition date	$ (13)	$ (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]
Other real estate	408	421
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]
Other real estate	408	421
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]
Other real estate	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]
Other real estate	$ 0	$ 0

Fair Value of Assets and Liab75

Fair Value of Assets and Liabilities - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Nov. 29, 2013
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investment securities held to maturity	$ 45,097	$ 71,054
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	$ 48,804	26,343
Fair Value Hierarcy (Level 1) | Fair Value
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and cash equivalents	48,804	26,343
Fair Value Hierarchy (Level 2) | Carrying Value
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investment securities held to maturity	44,438	69,637
Interest receivable	6,319	6,643
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Deposits	1,772,700	1,728,226
Federal Home Loan Bank borrowing	0	67,000
Interest payable	134	187
Fair Value Hierarchy (Level 2) | Fair Value
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investment securities held to maturity	45,097	71,054
Interest receivable	6,319	6,643
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Deposits	1,773,102	1,728,717
Federal Home Loan Bank borrowing	0	67,279
Interest payable	134	187
Fair Value Hierarchy (Level 3) | Carrying Value
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans, net	1,471,174	1,436,229
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Subordinated debentures	5,586	5,395
Fair Value Hierarchy (Level 3) | Fair Value
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans, net	1,473,360	1,470,380
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Subordinated debentures	$ 5,083	$ 5,132

Benefit Plans - Deferred Compen

Benefit Plans - Deferred Compensation Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Jan. 01, 2016	Dec. 31, 2015	Jan. 01, 2015	Jan. 01, 2014
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%		3.25%	3.25%
Deferred compensation obligation	$ 3.2		$ 3
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, 2016USD ($)date	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
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	$ 589	$ 555	$ 548
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	$ 1,200	$ 1,100	$ 1,200
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, 2016	Dec. 31, 2015
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	$ 1,000	$ 823

Income Taxes - Components of In

Income Taxes - Components of Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current tax provision
Federal	$ 9,710	$ 7,097	$ 8,523
State	3,794	2,931	3,195
Total current	13,504	10,028	11,718
Deferred tax provision (benefit)
Federal	(206)	382	(146)
State	48	80	126
Total deferred	(158)	462	(20)
Total income tax provision	$ 13,346	$ 10,490	$ 11,698

Income Taxes - Deferred Tax Ass

Income Taxes - Deferred Tax Asset and Liability (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Allowance for loan losses and off-balance sheet credit commitments	$ 6,871,000	$ 5,918,000
Net operating loss carryforwards from the NorCal acquisition	3,582,000	4,090,000
Net unrealized loss on securities available-for-sale	2,543,000	59,000
Deferred compensation plan and salary continuation plan	1,773,000	1,619,000
State franchise tax	1,300,000	1,005,000
Accrued but unpaid expenses	1,251,000	1,188,000
Fair value adjustment on loans acquired from the NorCal acquisition	799,000	1,197,000
Deferred rent and other lease incentives	547,000	595,000
Depreciation and disposals on premises and equipment	528,000	231,000
Other real estate owned	448,000	448,000
Stock-based compensation	398,000	273,000
Interest received on nonaccrual loans	185,000	864,000
Other	196,000	381,000
Total gross deferred tax assets	20,421,000	17,868,000
Deferred tax liabilities:
Deferred loan origination costs and fees	(2,784,000)	(2,567,000)
Unaccreted discount on subordinated debentures	(1,119,000)	(1,200,000)
Core deposit intangible asset	(1,085,000)	(1,309,000)
Accretion on investment securities	(54,000)	(55,000)
Other	(42,000)	(42,000)
Total gross deferred tax liabilities	(5,084,000)	(5,173,000)
Net deferred tax assets	15,337,000	12,695,000
Valuation allowance of deferred tax assets	0	$ 0
Federal
Deferred tax liabilities:
Net operating loss carryforwards expected to expire	6,300,000
California
Deferred tax liabilities:
Net operating loss carryforwards expected to expire	$ 19,300,000

Income Taxes - Effective Income

Income Taxes - Effective Income Tax Reconciliation (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
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%	6.80%
Tax exempt interest on municipal securities and loans	(4.00%)	(4.20%)	(3.30%)
Tax exempt earnings on bank owned life insurance	(0.80%)	(1.00%)	(0.90%)
Low income housing tax credits	(0.30%)	(0.20%)	(0.10%)
Other	(0.10%)	(0.10%)	(0.30%)
Effective Tax Rate	36.60%	36.30%	37.20%

Commitments and Contingencies82

Commitments and Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Leases
Commitments under operating leases, 2017	$ 3,850
Commitments under operating leases, 2018	3,919
Commitments under operating leases, 2019	3,725
Commitments under operating leases, 2020	3,405
Commitments under operating leases, 2021	2,114
Commitments under operating leases, Thereafter	4,069
Commitments under operating leases, Total	21,082
Minimum payments due on minimum sublease rentals under non-cancelable subleases	151
Rent expense included in occupancy expense	3,900	$ 4,200	$ 4,200
Visa Inc.
Loss Contingencies [Line Items]
Balance of escrow account for legal settlements maintained by Visa	1,000,000
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, 2016USD ($)customer	Dec. 31, 2015USD ($)
U.S. Government, its agencies and Government Sponsored Enterprises (GSEs)
Concentration Risk [Line Items]
Concentration risk percentage	72.00%	74.40%
Concentration risk amount | $	$ 299.5	$ 362.6
Loans on real estate
Concentration Risk [Line Items]
Concentration risk percentage	79.00%	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 Instrume84

Derivative Financial Instruments and Hedging Activities - Narrative (Details) $ in Thousands	1 Months Ended		12 Months Ended
	Sep. 30, 2016derivative	Apr. 30, 2016derivative	Dec. 31, 2016USD ($)derivative	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Derivatives, Fair Value [Line Items]
Derivative, Number of Instruments Terminated | derivative	1	1
Interest rate contracts fair value, Asset derivatives			$ 55	$ 3
Interest rate contracts fair value			933	1,658
Fair value hedge
Derivatives, Fair Value [Line Items]
Net hedge ineffectiveness gain (loss), derivatives			113	(80)	$ 194
Fair value hedge | Interest income
Derivatives, Fair Value [Line Items]
Increase (decrease) in value of designated interest rate swaps due to LIBOR interest rate movements recognized in interest income			778	280	(377)
Payment on interest rate swaps recorded in interest income			(556)	(918)	(1,002)
(Decrease) increase in value of hedged loans recognized in interest income			(571)	(308)	662
Decrease in value of yield maintenance agreement recognized against interest income			(94)	(52)	(91)
Net loss on derivatives recognized against interest income			(443)	(998)	$ (808)
Fair value hedge | Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Derivatives, accrued interest, interest rate swaps			$ 13	28
Interest rate swap | Fair value hedge | Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Number of derivative instruments | derivative			5
Interest rate swap | Fair value hedge | Designated as hedging instrument | Other assets
Derivatives, Fair Value [Line Items]
Interest rate contracts notional amounts, Asset derivatives			$ 4,217	4,407
Interest rate swap | Fair value hedge | Designated as hedging instrument | Other liabilities
Derivatives, Fair Value [Line Items]
Interest rate contracts notional amount, Liability derivatives			15,495	22,187
Interest rate contract | Fair value hedge | Designated as hedging instrument | Other assets
Derivatives, Fair Value [Line Items]
Interest rate contracts fair value, Asset derivatives			55	3
Interest rate contract | Fair value hedge | Designated as hedging instrument | Other liabilities
Derivatives, Fair Value [Line Items]
Interest rate contracts fair value			$ 933	$ 1,658

Derivative Financial Instrume85

Derivative Financial Instruments and Hedging Activities - Offsetting of Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	$ 55	$ 3
Offset in the Statements of Condition	0	0
Net Amounts of Assets Presented in the Statements of Condition	55	3
Derivative, Collateral, Obligation to Return Securities	(55)	(3)
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	55	3
Offset in the Statements of Condition		0
Net Amounts of Assets Presented in the Statements of Condition	55	3
Derivative, Collateral, Obligation to Return Securities	(55)	(3)
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Received		0
Net Amount	$ 0	$ 0

Derivative Financial Instrume86

Derivative Financial Instruments and Hedging Activities - Offsetting of Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	$ 933	$ 1,658
Gross Amounts Offset in the Statements of Condition	0	0
Net Amounts of Liabilities Presented in the Statements of Condition	933	1,658
Gross Amounts Not Offset in the Statements of Condition, Financial Instruments	(55)	(3)
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Pledged	(878)	(1,655)
Net Amount	0	0
Other liabilities | Interest rate swap
Offsetting Liabilities [Line Items]
Derivative liabilities, accrued interest, interest rate swaps	12	27
Counterparty A
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	933	1,390
Gross Amounts Offset in the Statements of Condition		0
Net Amounts of Liabilities Presented in the Statements of Condition	933	1,390
Gross Amounts Not Offset in the Statements of Condition, Financial Instruments	(55)	(3)
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Pledged	(878)	(1,387)
Net Amount	$ 0	0
Counterparty B
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities		268
Gross Amounts Offset in the Statements of Condition		0
Net Amounts of Liabilities Presented in the Statements of Condition		268
Gross Amounts Not Offset in the Statements of Condition, Financial Instruments		0
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Pledged		(268)
Net Amount		$ 0

Regulatory Matters (Details)

Regulatory Matters (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Bancorp
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital, Actual, Amount	$ 247,453	$ 227,269
Total Capital (to risk-weighted assets), Actual, Ratio	14.32%	13.37%
Total Capital, Minimum Capital for Capital Adequacy Purposes, Amount	$ 149,039	$ 135,996
Total Capital (to risk-weighted assets), Minimum Capital for Capital Adequacy Purposes, Ratio	8.625%	8.00%
Total Capital, Minimum Capital to be Well Capitalized, Amount	$ 172,799	$ 169,995
Total Capital (to risk-weighted assets), Minimum to be Well Capitalized, Ratio	10.00%	10.00%
Tier 1 Risk Based Capital, Actual, Amount	$ 231,111	$ 211,521
Tier 1 Risk Based Capital (to risk-weighted assets), Actual, Ratio	13.37%	12.44%
Tier 1 Capital, Minimum Capital for Capital Adequacy Purposes, Amount	$ 114,479	$ 101,997
Tier 1 Risk Based Capital (to risk-weighted assets), Minimum Capital for Capital Adequacy Purposes, Ratio	6.625%	6.00%
Tier 1 Risk Based Capital, Minimum Capital to be Well Capitalized, Amount	$ 138,239	$ 135,996
Tier 1 Risk Based Capital (to risk-weighted assets), Minimum Capital to be Well Capitalized, Ratio	8.00%	8.00%
Tier 1 Leverage Capital, Amount, Actual	$ 231,111	$ 211,521
Tier 1 Leverage Capital (to average assets), Actual, Ratio	11.39%	10.67%
Tier 1 Leverage Capital, Minimum Capital for Capital Adequacy Purposes, Amount	$ 81,189	$ 79,296
Tier 1 Leverage Capital (to average assets), Minimum Capital for Capital Adequacy Purposes, Ratio	4.00%	4.00%
Tier 1 Leverage Capital, Actual, Amount	$ 101,486	$ 99,120
Tier 1 Leverage Capital (to average assets), Minimum Capital to be Well Capitalized, Ratio	5.00%	5.00%
Tier 1 Common Equity	$ 225,925	$ 206,724
Tier 1 Common Equity To Average Assets	13.07%	12.16%
Tier 1 Common Equity Required for Capital Adequacy	$ 88,559	$ 76,498
Tier 1 Common Equity Required for Capital Adequacy to Average Assets	5.125%	4.50%
Tier 1 Common Equity Required to be Well Capitalized	$ 112,319	$ 110,497
Tier 1 Common Equity Required to be Well Capitalized to Average Assets	6.50%	6.50%
The Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital, Actual, Amount	$ 243,468	$ 222,830
Total Capital (to risk-weighted assets), Actual, Ratio	14.09%	13.11%
Total Capital, Minimum Capital for Capital Adequacy Purposes, Amount	$ 149,016	$ 135,968
Total Capital (to risk-weighted assets), Minimum Capital for Capital Adequacy Purposes, Ratio	8.625%	8.00%
Total Capital, Minimum Capital to be Well Capitalized, Amount	$ 172,772	$ 169,960
Total Capital (to risk-weighted assets), Minimum to be Well Capitalized, Ratio	10.00%	10.00%
Tier 1 Risk Based Capital, Actual, Amount	$ 227,127	$ 207,082
Tier 1 Risk Based Capital (to risk-weighted assets), Actual, Ratio	13.15%	12.18%
Tier 1 Capital, Minimum Capital for Capital Adequacy Purposes, Amount	$ 114,462	$ 101,976
Tier 1 Risk Based Capital (to risk-weighted assets), Minimum Capital for Capital Adequacy Purposes, Ratio	6.625%	6.00%
Tier 1 Risk Based Capital, Minimum Capital to be Well Capitalized, Amount	$ 138,218	$ 135,968
Tier 1 Risk Based Capital (to risk-weighted assets), Minimum Capital to be Well Capitalized, Ratio	8.00%	8.00%
Tier 1 Leverage Capital, Amount, Actual	$ 227,127	$ 207,082
Tier 1 Leverage Capital (to average assets), Actual, Ratio	11.19%	10.45%
Tier 1 Leverage Capital, Minimum Capital for Capital Adequacy Purposes, Amount	$ 81,176	$ 79,268
Tier 1 Leverage Capital (to average assets), Minimum Capital for Capital Adequacy Purposes, Ratio	4.00%	4.00%
Tier 1 Leverage Capital, Actual, Amount	$ 101,469	$ 99,085
Tier 1 Leverage Capital (to average assets), Minimum Capital to be Well Capitalized, Ratio	5.00%	5.00%
Tier 1 Common Equity	$ 227,127	$ 207,082
Tier 1 Common Equity To Average Assets	13.15%	12.18%
Tier 1 Common Equity Required for Capital Adequacy	$ 88,546	$ 76,482
Tier 1 Common Equity Required for Capital Adequacy to Average Assets	5.125%	4.50%
Tier 1 Common Equity Required to be Well Capitalized	$ 112,302	$ 110,474
Tier 1 Common Equity Required to be Well Capitalized to Average Assets	6.50%	6.50%

Financial Instruments with Of88

Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
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	$ 216,774	$ 191,305
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	148,143	130,359
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	44,798	39,442
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	10,635	11,112
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	1,939	4,381
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	$ 422,289	376,599
Percentage of commitments expiring in 2017	42.00%
Percentage of commitments expiring between 2018 and 2024	42.00%
Percentage of commitments expiring 2025 and thereafter	16.00%
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	$ 899	$ 749

Condensed Bank of Marin Banco89

Condensed Bank of Marin Bancorp Parent Only Financial Statements - Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Other assets	$ 68,961	$ 62,284
Total assets	2,023,493	2,031,134
Subordinated debentures	5,586	5,395
Other liabilities	14,644	16,040
Total liabilities	1,792,930	1,816,661
Stockholders' equity	230,563	214,473	$ 200,026	$ 180,887
Total liabilities and stockholders' equity	2,023,493	2,031,134
Bancorp
Condensed Financial Statements, Captions [Line Items]
Cash and due from Bank of Marin	3,568	3,796
Investment in bank subsidiary	232,431	215,722
Other assets	670	770
Total assets	236,669	220,288
Subordinated debentures	5,586	5,395
Accrued expenses payable	96	109
Other liabilities	424	311
Total liabilities	6,106	5,815
Stockholders' equity	230,563	214,473
Total liabilities and stockholders' equity	$ 236,669	$ 220,288

Condensed Bank of Marin Banco90

Condensed Bank of Marin Bancorp Parent Only Financial Statements - Income Statement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Interest expense	$ 2,269	$ 2,251	$ 2,349
Non-interest expense	47,692	46,949	47,263
Income tax benefit	(13,346)	(10,490)	(11,698)
Net income	23,134	18,441	19,771
Bancorp
Condensed Financial Statements, Captions [Line Items]
Dividends from bank subsidiary	6,400	6,500	0
Miscellaneous Income	7	6	8
Total income	6,407	6,506	8
Interest expense	435	420	421
Non-interest expense	984	973	851
Total expense	1,419	1,393	1,272
Income (loss) before income taxes and equity in undistributed net income of subsidiary	4,988	5,113	(1,264)
Income tax benefit	594	583	532
Income (loss) before equity in undistributed net income of subsidiary	5,582	5,696	(732)
Earnings of bank subsidiary greater (less) than dividends received from bank subsidiary	17,552	12,745	20,503
Net income	$ 23,134	$ 18,441	$ 19,771

Condensed Bank of Marin Banco91

Condensed Bank of Marin Bancorp Parent Only Financial Statements - Cash Flow Statement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Net income	$ 23,134	$ 18,441	$ 19,771
Accretion of discount on subordinated debentures	191	210	216
Other assets	257	1,081	(184)
Other liabilities	(110)	1,355	(2,430)
Net cash provided by operating activities	25,446	23,682	18,857
Net cash used in investing activities	24,318	(263,278)	(42,652)
Dividends paid on common stock	(6,223)	(5,390)	(4,733)
Net cash (used in) provided by financing activities	(27,303)	224,572	(38,611)
Net (decrease) increase in cash and cash equivalents	22,461	(15,024)	(62,406)
Stock issued in payment of director fees	234	275	236
Bancorp
Condensed Financial Statements, Captions [Line Items]
Net income	23,134	18,441	19,771
Earnings of bank subsidiary greater than dividends received from bank subsidiary	(17,552)	(12,745)	(20,503)
Accretion of discount on subordinated debentures	191	210	216
Other assets	353	(298)	(88)
Intercompany receivable	171	(18)	0
Other liabilities	(302)	368	(99)
Net cash provided by operating activities	5,995	5,958	(703)
Capital contribution to subsidiary	(1,285)	(1,156)	(1,475)
Net cash used in investing activities	(1,285)	(1,156)	(1,475)
Stock options exercised and stock purchases	1,285	1,156	1,475
Dividends paid on common stock	(6,223)	(5,390)	(4,733)
Net cash (used in) provided by financing activities	(4,938)	(4,234)	(3,258)
Net (decrease) increase in cash and cash equivalents	(228)	568	(5,436)
Cash and cash equivalents at beginning of period	3,796	3,228	8,664
Cash and cash equivalents at end of period	3,568	3,796	3,228
Stock issued in payment of director fees	$ 234	$ 275	$ 236