United Security Bancshares (UBFO) 10-K 2 Mar 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Feb. 28, 2018	Jun. 30, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	UNITED SECURITY BANCSHARES
Entity Central Index Key	1,137,547
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			$ 119,569,297
Entity Common Stock, Shares Outstanding		16,885,615
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets
Cash and non-interest bearing deposits in other banks	$ 35,237	$ 25,781
Cash and due from Federal Reserve Bank	72,697	87,251
Cash and cash equivalents	107,934	113,032
Interest-bearing deposits in other banks	0	650
Investment securities available for sale (at fair value)	45,722	57,491
Loans	601,351	569,759
Unearned fees and unamortized loan origination costs, net	1,039	1,075
Allowance for credit losses	(9,267)	(8,902)
Net loans	593,123	561,932
Accrued interest receivable	6,526	3,895
Premises and equipment – net	10,165	10,445
Other real estate owned	5,745	6,471
Goodwill	4,488	4,488
Cash surrender value of life insurance	19,752	19,047
Investment in limited partnerships	1,601	757
Deferred tax assets - net	2,389	3,298
Other assets	8,391	6,466
Total assets	805,836	787,972
Deposits
Noninterest bearing	307,299	262,697
Interest bearing	380,394	413,932
Total deposits	687,693	676,629
Accrued interest payable	44	76
Accounts payable and other liabilities	7,017	5,781
Junior subordinated debentures (at fair value)	9,730	8,832
Total liabilities	704,484	691,318
Shareholders' Equity
Common stock, no par value 20,000,000 shares authorized, 16,885,615 issued and outstanding at December 31, 2017, and 16,705,594 at December 31, 2016	57,880	56,557
Retained earnings	44,182	40,701
Accumulated other comprehensive loss	(710)	(604)
Total shareholders' equity	101,352	96,654
Total liabilities and shareholders' equity	$ 805,836	$ 787,972

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Shareholders' Equity
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares issued (in shares)	16,885,615	16,051,406
Common stock, shares outstanding (in shares)	16,885,615	16,051,406

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest Income
Loans, including fees	$ 30,817	$ 28,182	$ 26,469
Investment securities – AFS – taxable	901	825	722
Interest on deposits in FRB	1,207	458	213
Interest on deposits in other banks	5	8	6
Total interest income	32,930	29,473	27,410
Interest Expense
Interest on deposits	1,426	1,167	1,056
Interest on other borrowings	304	242	225
Total interest expense	1,730	1,409	1,281
Net Interest Income Before Recovery of Provision for Credit Losses	31,200	28,064	26,129
Provision (recovery of provision) for Credit Losses	24	(21)	(41)
Net Interest Income after Provision for Credit Losses	31,176	28,085	26,170
Noninterest Income
Customer service fees	3,851	3,792	3,620
Increase in cash surrender value of bank owned life insurance	534	530	519
Loss on fair value of financial liability	(882)	(518)	(73)
Gain on redemption of JR subordinated debentures	0	0	78
Gain on sale of premises and equipment	73	0	10
Gain (loss) on sale of other investment	3	0	(23)
Other	727	710	604
Total noninterest income	4,306	4,514	4,735
Noninterest Expense
Salaries and employee benefits	10,821	10,628	9,921
Occupancy expense	4,254	4,222	4,042
Data processing	119	148	126
Professional fees	1,433	1,493	1,137
Regulatory assessments	391	767	959
Director fees	289	284	277
Loss on California tax credit partnership	109	158	73
Net (gain) cost on operation and sale of OREO	(150)	263	619
Other	2,537	2,382	2,444
Total noninterest expense	19,803	20,345	19,598
Income Before Provision for Taxes	15,679	12,254	11,307
Provision for Taxes on Income	7,039	4,869	4,497
Net Income	$ 8,640	$ 7,385	$ 6,810
Net Income per common share
Basic (dollars per share)	$ 0.51	$ 0.44	$ 0.40
Diluted (dollars per share)	$ 0.51	$ 0.44	$ 0.40
Shares on which net income per common share were based
Basic (in shares)	16,885,587	16,881,379	16,880,563
Diluted (in shares)	16,904,915	16,889,027	16,882,797

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net Income	$ 8,640	$ 7,385	$ 6,810
Unrealized holdings gains (losses) on securities	16	(648)	(265)
Unrealized losses on unrecognized post retirement costs	(6)	(22)	224
Other comprehensive income (loss), before tax	10	(670)	(41)
Tax (expense) benefit related to securities	(6)	259	106
Tax (expense) benefit related to unrecognized post-retirement costs	3	9	(92)
Total other comprehensive loss	7	(402)	(27)
Comprehensive income	$ 8,647	$ 6,983	$ 6,783

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands		Total	Common stock		Retained Earnings	Accumulated Other Comprehensive Loss	Restricted Stock Units (RSUs)Common stock	Dividend paid	Dividend paidRetained Earnings	Dividend declared	Dividend declaredRetained Earnings
Balance at Dec. 31, 2014		$ 82,826	$ 49,271		$ 33,730	$ (175)
Balance (in shares) at Dec. 31, 2014	[1]		15,425,086
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive loss		(27)				(27)
Common stock dividends			$ 3,275		(3,275)
Common stock dividends (in shares)			626,320
Stock-based compensation expense		26	$ 26
Net Income		6,810			6,810
Balance at Dec. 31, 2015		89,635	$ 52,572		37,265	(202)
Balance (in shares) at Dec. 31, 2015	[2]		16,051,406
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive loss		(402)				(402)
Common stock dividends		0	$ 3,949		(3,949)
Common stock dividends (in shares)			651,725
Stock options exercised		6	$ 6
Common stock issuance (in shares)			2,463
Stock-based compensation expense		30	$ 30
Net Income		7,385			7,385
Balance at Dec. 31, 2016		$ 96,654	$ 56,557		40,701	(604)
Balance (in shares) at Dec. 31, 2016		16,051,406	16,705,594	[3]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive loss		$ 7				7
Reclassification of income tax effects from accumulated other comprehensive income					113	(113)
Common stock dividends		0	$ 1,220		(1,220)
Common stock dividends (in shares)			167,082
Dividends on common stock								$ (2,870)	$ (2,870)	$ (1,182)	$ (1,182)
Stock options exercised		6	$ 6
Restricted stock units released							10,425
Common stock issuance (in shares)			2,514
Stock-based compensation expense		97	$ 97
Net Income		8,640			8,640
Balance at Dec. 31, 2017		$ 101,352	$ 57,880		$ 44,182	$ (710)
Balance (in shares) at Dec. 31, 2017		16,885,615	16,885,615	[4]
[1]	Excludes 0 unvested restricted shares
[2]	Excludes 15,019 unvested restricted shares
[3]	Excludes 12,015 unvested restricted shares
[4]	Excludes 46,511 unvested restricted shares

Consolidated Statements of Cha7

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - shares	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restricted Stock
Non-vested awards (in shares)	46,511	12,015	15,019	0

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash Flows From Operating Activities:
Net Income	$ 8,640	$ 7,385	$ 6,810
Adjustments to reconcile net income to cash provided by operating activities:
Provision (recovery of provision) for credit losses	24	(21)	(41)
Depreciation and amortization	1,335	1,428	1,462
Amortization of investment securities	534	481	266
Accretion of investment securities	(8)	(28)	(44)
Increase in accrued interest receivable	(2,631)	(1,676)	(293)
(Decrease) increase in accrued interest payable	(32)	47	(11)
Decrease (increase) in unearned fees	36	(1,017)	(382)
(Increase) decrease in income taxes receivable	(734)	957	(229)
Stock-based compensation expense	97	30	26
Provision for deferred income taxes	906	2,199	1,640
(Decrease) increase in accounts payable and accrued liabilities	(39)	(146)	29
(Gain) loss on sale of investment in limited partnership	(3)	0	23
Gain on sale of other real estate owned	(336)	(37)	(16)
Impairment loss on other real estate owned	0	0	188
Loss on fair value option of financial liabilities	882	518	73
Gain on redemption of junior subordinated debentures	0	0	(78)
Increase in surrender value of life insurance	(534)	(530)	(519)
Loss on tax credit limited partnership interest	109	158	73
(Gain) on disposal of premises and equipment	73	0	10
Net decrease (increase) in other assets	(618)	(290)	297
Net cash provided by operating activities	7,555	9,458	9,264
Cash Flows From Investing Activities:
Net increase (decrease) in interest-bearing deposits with banks	650	878	(6)
Purchase of correspondent bank stock	(495)	(101)	(147)
Maturities and calls on available-for-sale securities	0	2,600	11,000
Principal payments on available-for-sale securities	11,260	4,687	5,922
Purchases of available-for-sale securities	0	(34,987)	0
Purchase of bank-owned life insurance/company-owned life insurance	0	(220)	(220)
Net increase in loans	(31,251)	(51,465)	(58,642)
Cash proceeds from sales of other real estate owned	1,062	3,378	1,192
Payoff of senior liens on other real estate owned	0	(705)	0
Cash proceeds from sale of premises and equipment	0	0	23
Capital expenditures for premises and equipment	(1,128)	(1,073)	(725)
(Investment in) distributions from limited partnership	(954)	1	(119)
Net cash used in investing activities	(20,856)	(77,007)	(41,722)
Cash Flows From Financing Activities:
Net increase in demand deposit and savings accounts	49,226	20,993	65,418
Net (decrease) increase in certificates of deposit	(38,159)	33,831	(8,986)
Proceeds from exercise of stock options	6	6	0
Cash dividend	(2,870)	0	0
Redemption of junior subordinated debentures	0	0	(1,800)
Net cash provided by financing activities	8,203	54,830	54,632
Net (decrease) increase in cash and cash equivalents	(5,098)	(12,719)	22,174
Cash and cash equivalents at beginning of year	113,032	125,751	103,577
Cash and cash equivalents at end of year	$ 107,934	$ 113,032	$ 125,751

Organization and Summary of Sig

Organization and Summary of Significant Accounting and Reporting Policies	12 Months Ended
	Dec. 31, 2017
Organization and Summary of Significant Accounting and Reporting Policies [Abstract]
Organization and Summary of Significant Accounting and Reporting Policies	Organization and Summary of Significant Accounting and Reporting Policies Basis of Presentation – The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States and with prevailing practices within the banking industry. The consolidated financial statements include the accounts of United Security Bancshares, and its wholly owned subsidiaries, United Security Bank and subsidiary (the “Bank”) and USB Capital Trust II (the "Trust"). The Trust is deconsolidated pursuant to ASC 810. As a result, the Trust Preferred Securities are not presented on the Company’s consolidated financial statements as equity, but instead they are presented as Junior Subordinated Debentures are presented as a separate liability category. (see Note 8 to the Company’s consolidated financial statements). Intercompany accounts and transactions have been eliminated in consolidation. In the following notes, references to the Bank are references to United Security Bank. References to the Company are references to United Security Bancshares, (including the Bank). United Security Bancshares operates as one business segment providing banking services to commercial establishments and individuals primarily in the San Joaquin Valley of California. Nature of Operations – United Security Bancshares is a bank holding company, incorporated in the state of California for the purpose of acquiring all the capital stock of the Bank through a holding company reorganization (the “Reorganization”) of the Bank. The Reorganization, which was accounted for in a manner similar to a pooling of interests, was completed on June 12, 2001. Management believes the Reorganization has provided the Company greater operating and financial flexibility and has permitted expansion into a broader range of financial services and other business activities. During July 2007 the Company formed USB Capital Trust II and issued $15.0 million in Trust Preferred Securities with terms similar to those originally issued under USB Capital Trust I. During 2015, the Bank purchased $3.0 million of the Company's junior subordinated debentures related to the Company's trust preferred securities at a fair value discount of 40% . Subsequently, the Company purchased those shares from the Bank and canceled $3.0 million in par value of the junior subordinated debentures, realizing a $78,000 gain on redemption. The contractual principal balance of the Company's debentures relating to its trust preferred securities is $12.0 million as of December 31, 2017 . (See Note 8. “Junior Subordinated Debt/Trust Preferred Securities”). USB Investment Trust Inc was incorporated effective December 31, 2001, as a special purpose real estate investment trust (“REIT”) under Maryland law. The REIT is a subsidiary of the Bank and was funded with $133.0 million in real estate-secured loans contributed by the Bank. USB Investment Trust was originally formed to give the Bank flexibility in raising capital, and reduce the expenses associated with holding the assets contributed to USB Investment Trust. The Bank was founded in 1987 and currently operates eleven branches and one construction lending office in an area from eastern Madera County to western Fresno County, as well as Taft and Bakersfield in Kern County, and Campbell in Santa Clara County. The Bank also operates one financial services department located in Fresno, California. The Bank’s primary source of revenue is interest income through providing loans to customers, who are predominantly small and middle-market businesses and individuals. The Bank engages in a full compliment of lending activities, including real estate mortgage, commercial and industrial, real estate construction, agricultural and consumer loans, with particular emphasis on short and medium term obligations. The Bank offers a wide range of deposit instruments. These include personal and business checking accounts and savings accounts, interest-bearing negotiable order of withdrawal (NOW) accounts, money market accounts and time certificates of deposit. Most of the Bank's deposits are attracted from individuals and from small and medium-sized business-related sources. The Bank also offers a wide range of specialized services designed to attract and service the needs of commercial customers and account holders. These services include cashiers checks, travelers checks, money orders, and foreign drafts. In addition, the Bank offers Internet banking services to its commercial and retail customers, and offers certain financial and wealth management services through its financial services department. The Bank does not operate a trust department, however it makes arrangements with its correspondent bank to offer trust services to its customers upon request. Use of Estimates in the Preparation of Financial Statements - The preparation of financial statements in conformity with accounting principles generally accepted 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 assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change, relate to the determination of the allowance for loan losses, determination of goodwill, fair value of junior subordinated debt and certain collateralized mortgage obligations, and the valuation of real estate acquired in connection with foreclosures or in satisfaction of loans. Subsequent events —The Company has evaluated events and transactions for potential recognition or disclosure through the day the financial statements were issued. Significant Accounting Policies - The Company follows accounting standards set by the Financial Accounting Standards Board, commonly referred to as “FASB.” FASB sets generally accepted accounting principles (GAAP) that the Company follows to ensure the consistent reporting of its consolidated financial condition, consolidated results of operations, and consolidated cash flows. References to GAAP issued by FASB in these footnotes are to FASB Accounting Standards Codification , sometimes referred to as the Codification or ASC. The following is a summary of significant policies: a. Cash and cash equivalents – Cash and cash equivalents include cash on hand, amounts due from banks, federal funds sold and repurchase agreements. At times throughout the year, balances can exceed FDIC insurance limits. Generally, federal funds sold and repurchase agreements are sold for one-day periods. The Bank did not have any repurchase agreements during 2017 or 2016 , or at December 31, 2017 and 2016 . All cash and cash equivalents have maturities when purchased of three months or less. b. Securities - Debt and equity securities classified as available for sale are reported at fair value, with unrealized gains and losses excluded from net income and reported, net of tax, as a separate component of comprehensive income and shareholders’ equity. Debt securities classified as held to maturity are carried at amortized cost. Gains and losses on disposition are reported using the specific identification method for the adjusted basis of the securities sold. Premiums and discounts are recognized in interest income using the interest method over the period to maturity. The Company classifies its securities as available for sale or held to maturity, and periodically reviews its investment portfolio on an individual security basis. Securities that are to be held for indefinite periods of time (including, but not limited to, those that management intends to use as part of its asset/liability management strategy, those which may be sold in response to changes in interest rates, changes in prepayments or any such other factors) are classified as securities available for sale. Securities which the Company has the ability and intent to hold to maturity are classified as held to maturity. Investments with fair values that are less than amortized cost are considered impaired. Impairment may result from either a decline in the financial condition of the issuing entity or, in the case of fixed interest rate investments, from rising interest rates. At each financial statement date, management assesses each investment to determine if impaired investments are temporarily impaired or if the impairment is other-than-temporary based upon the positive and negative evidence available. Evidence evaluated includes, but is not limited to, industry analyst reports, credit market conditions, and interest rate trends. Management also assesses whether it intends to sell, or it is more likely than not that it will be required to sell, a security in an unrealized loss position before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the entire difference between the amortized cost and fair value is recognized as impairment through earnings. For debt securities that do not meet the aforementioned criteria, the amount of impairment is split into two components as follows: (1) OTTI related to credit loss, which must be recognized in the income statement; and (2) OTTI related to other factors, which is recognized in other comprehensive income. The credit loss is defined as the difference between the present value of the cash flows expected to be collected and the amortized cost basis. For equity securities, the entire amount of impairment is recognized through earnings. c. Loans - Interest income on loans is credited to income as earned and is calculated by using the simple interest method on the daily balance of the principal amounts outstanding. Loans are placed on non-accrual status when principal or interest is past due for 90 days and/or when management believes the collection of amounts due is doubtful. For loans placed on nonaccrual status, the accrued and unpaid interest receivable may be reversed at management's discretion based upon management's assessment of collectability, and interest is thereafter credited to principal to the extent necessary to eliminate doubt as to the collectability of the net carrying amount of the loan. Nonrefundable fees and related direct costs associated with the origination or purchase of loans are deferred and netted against outstanding loan balances. The net deferred fees and costs are generally amortized into interest income over the loan term using the interest method. Other credit-related fees, such as standby letter of credit fees, loan placement fees and annual credit card fees are recognized as noninterest income during the period the related service is performed. d. Allowance for Credit Losses and Reserve for Unfunded Loan Commitments - The allowance for credit losses is maintained to provide for losses that can reasonably be anticipated. The allowance is based on ongoing quarterly assessments of the probable losses inherent in the loan portfolio, and to a lesser extent, unfunded loan commitments. The reserve for unfunded loan commitments is a liability on the Company’s consolidated financial statements and is included in other liabilities. The liability is computed using a methodology similar to that used to determine the allowance for credit losses, modified to take into account the probability of a drawdown on the commitment. The allowance for credit losses is increased by provisions charged to operations during the current period and reduced by negative provisions and loan charge-offs, net of recoveries. Loans are charged against the allowance when management believes that the collection of the principal is unlikely. The allowance is an amount that management believes will be adequate to absorb losses inherent in existing loans, based on evaluations of the probability of collection. In evaluating the probability of collection, management is required to make estimates and assumptions that affect the reported amounts of loans, allowance for credit losses and the provision for credit losses charged to operations. Actual results could differ significantly from those estimates. These evaluations take into consideration such factors as the composition of the portfolio, overall portfolio quality, loan concentrations, specific problem loans, and current economic conditions that may affect the borrowers' ability to pay. The Company’s methodology for assessing the adequacy of the allowance for credit losses consists of several key elements, which include: - the formula allowance - specific allowances for problem graded loans identified as impaired - and the unallocated allowance The formula allowance is calculated by applying loss factors to outstanding loans. Loss factors are based on the Company’s historical loss experience and on the internal risk grade of those loans and, may be adjusted for significant factors, including economic factors that, in management's judgment, affect the collectability of the portfolio as of the evaluation date. Management determines the loss factors for problem graded loans (substandard, doubtful, and loss), special mention loans, and pass graded loans, based on a loss migration model. The migration analysis incorporates loan losses over the previous quarters as determined by management (time horizons adjusted as business cycles or environment changes) and loss factors are adjusted to recognize and quantify the loss exposure from changes in market conditions and trends in the Company’s loan portfolio. Those factors include 1) trends in delinquent and nonaccrual loans, 2) trends in loan volume and terms, 3) effects of changes in lending policies, 4) concentrations of credit, 5) competition, 6) national and local economic trends and conditions, 7) experience of lending staff, 8) loan review and Board of Directors oversight, 9) high balance loan concentrations, and 10) other business conditions. For purposes of this analysis, loans are grouped by internal risk classifications, which are “pass," “special mention,” “substandard,” “doubtful,” and “loss." Certain loans are homogeneous in nature and are therefore pooled by risk grade. These homogeneous loans include consumer installment and home equity loans. Specific allowances are established based on management’s periodic evaluation of loss exposure inherent in impaired loans. For impaired loans, specific allowances are determined based on the collateralized value of the underlying properties, the net present value of the anticipated cash flows, or the market value of the underlying assets. A loan is considered impaired when management determines that it is probable that the Company will be unable to collect all amounts due according to the original contractual terms of the loan agreement. Impairment is measured by the difference between the original recorded investment in the loan and the estimated present value of the total expected future cash flows, discounted at the loan’s effective rate, or the fair value of the collateral, less estimated selling costs, if the loan is collateral dependent. The unallocated portion of the allowance is based upon management’s evaluation of various conditions that are not directly measured in the determination of the formula and specific allowances. The conditions may include, but are not limited to, general economic and business conditions affecting the key lending areas of the Company, credit quality trends, collateral values, loan volumes and concentrations, and other business conditions. e. Premises and Equipment - Premises and equipment are carried at cost less accumulated depreciation. Depreciation expense is computed principally on the straight-line method over the estimated useful lives of the assets. Estimated useful lives are as follows: Buildings 31 years Furniture and equipment 3-7 Years f. Other Real Estate Owned - Real estate properties acquired through, or in lieu of, loan foreclosure are to be sold and are initially recorded at fair value of the property, less estimated costs to sell. The excess, if any, of the loan amount over the fair value is charged to the allowance for credit losses. Subsequent declines in the fair value of other real estate owned, along with related revenue and expenses from operations, are charged to noninterest expense. g. Intangible Assets and Goodwill - Intangible assets are comprised of core deposit intangibles, other specific identifiable intangibles, and goodwill acquired in branch acquisitions where the consideration given exceeded the fair value of the net assets acquired. Intangible assets and goodwill are reviewed at least annually for impairment. All core deposit intangibles related to previous mergers have been fully amortized. During 2017 and 2016 , the Company recognized no impairment losses on the core deposit intangible related to the deposits purchased in the Legacy merger consummated during February 2007. The Company estimates no aggregate amortization expense related to intangible assets for the next five years. Goodwill amounts resulting from the acquisitions of Taft National Bank during April 2004, and Legacy Bank during February 2007 are considered to have an indefinite life and are not amortized. At December 31, 2017 , goodwill related to Taft National Bank totaled $1.6 million , and goodwill related to Legacy Bank totaled $2.9 million . Impairment testing of goodwill is performed at the reporting level during December of each year for Taft, and during March of each year for Legacy. During 2017 and 2016 , the Company did not recognize impairment adjustments on the goodwill related to the Legacy or Taft Bank mergers (see Note 19 to the Company’s consolidated financial statements contained herein for details of the goodwill impairment.) h. Income Taxes - Deferred income taxes are provided for the temporary differences between the financial reporting basis and the tax basis of the Company's assets and liabilities using the liability method, and are reflected at currently enacted income tax rates applicable to the period in which the deferred tax assets or liabilities are expected to be realized or settled. For the use in estimates the enacted tax rate of the period is utilized. i. Net Income per Share - Basic income per common share is computed based on the weighted average number of common shares outstanding. Diluted income per share includes the effect of stock options and other potentially dilutive securities using the treasury stock method to the extent they have a dilutive impact. Net income per share has been retroactively adjusted for all stock dividends declared. The number of potentially dilutive common shares included in quarterly diluted income per share 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 income per share is a year-to-date weighted average of potentially dilutive common shares included in each quarterly diluted net income per share computation. j. Cash Flow Reporting - For purposes of reporting cash flows, cash and cash equivalents include cash on hand, noninterest-bearing amounts due from banks, federal funds sold and securities purchased under agreements to resell. Federal funds and securities purchased under agreements to resell are generally sold for one-day periods. Net cash flows are reported for interest-bearing deposits with other banks, loans to customers, and deposits held for customers. k. Transfers of Financial Assets - Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity. l. Advertising Costs - The Company expenses marketing costs as they are incurred. Advertising expense was $154,000 , $126,000 , and $127,000 for the years ended December 31, 2017, 2016, and 2015 , respectively. m. Stock Based Compensation - The Company has a stock-based employee compensation plan, which is described more fully in Note 10. The Company accounts for all share-based payments to employees, including grants of employee stock options and restricted stock units and awards, to be recognized in the financial statements based on the grant date fair value of the award. The fair value is amortized over the requisite service period (generally the vesting period). Included in salaries and employee benefits for the years ended December 31, 2017, 2016, and 2015 are $97,000 , $30,000 , an $26,000 , respectively, of share-based compensation. The related tax benefit, recorded in the provision for income taxes, was not significant. All share data contained within the financial statements has been retroactively restated for stock based transactions (i.e. stock splits and stock dividends.) n. Federal Home Loan Bank stock and Federal Reserve Stock - As a member of the Federal Home Loan Bank (FHLB), the Company is required to maintain an investment in capital stock of the FHLB. In addition, as a member of the Federal Reserve Bank (FRB), the Company is required to maintain an investment in capital stock of the FRB. The investments in both the FHLB and the FRB are carried at cost, which approximates their fair value, in the accompanying consolidated balance sheets under other assets and are subject to certain redemption requirements by the FHLB and FRB. Stock redemptions are at the discretion of the FHLB and FRB. While technically these are considered equity securities, there is no market for the FHLB or FRB stock. Therefore, the shares are considered as restricted investment securities. Management periodically evaluates the stock for other-than-temporary impairment. Management’s determination of whether these investments are impaired is based on its assessment of the ultimate recoverability of cost rather than by recognizing temporary declines in value. The determination of whether a decline affects the ultimate recoverability of cost is influenced by criteria such as (1) the significance of any decline in net assets of the FHLB or FRB as compared to the capital stock amount of the FHLB or FRB and the length of time this situation has persisted, (2) commitments by the FHLB or FRB to make payments required by law or regulation and the level of such payments in relation to the operating performance of the FHLB or FRB, (3) the impact of legislative and regulatory changes on institutions and, accordingly, the customer base of the FHLB or FRB, and (4) the liquidity position of the FHLB or FRB. o. Comprehensive Income - Comprehensive income is comprised of net income and other comprehensive income. Other comprehensive income includes items recorded directly to equity, such as unrealized gains and losses on securities available-for-sale and unrecognized costs of salary continuation defined benefit plans. Comprehensive income is presented in the Consolidated Statements of Other Comprehensive Income. p. Segment Reporting - The Company's operations are solely in the financial services industry and include providing to its customers traditional banking and other financial services. The Company operates primarily in the San Joaquin Valley region of California. Management makes operating decisions and assesses performance based on an ongoing review of the Company's consolidated financial results. Therefore, the Company has a single operating segment for financial reporting purposes. q. New Accounting Standards: In May 2014, the Financial Accounting Standard Board (FASB) issued Accounting Standard Update (ASU) 2014-9 (ASU 2014-09), Revenue from Contracts with Customers. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance also specifies the accounting for some costs to obtain or fulfill a contract with a customer, as well as enhanced disclosure requirements. In August 2015, the FASB issued ASU 2015-14 which deferred the effective date of ASU 2014-09 to fiscal years, and interim reporting periods within those fiscal years, beginning after December 15, 2017. In March 2016, the FASB issued ASU 2016-08 which clarified the revenue recognition implementation guidance on principal versus agent considerations and is effective during the same period as ASU 2014-09. In April 2016, the FASB issued ASU 2016-10 which clarified the revenue recognition guidance regarding the identification of performance obligations and the licensing implementation and is effective during the same period as ASU 2014-09. In May 2016, the FASB issued ASU 2016-12 which narrowly amended the revenue recognition guidance regarding collectability, noncash consideration, presentation of sales tax and transition. ASU 2016-12 is effective during the same period as ASU 2014-09. The majority of the Company’s revenue consists of net interest income on financial assets and financial liabilities, which is explicitly excluded from the scope of ASU 2014-09. The Company adopted the new standard beginning January 1, 2018. The Company completed its analysis for determining the extent ASU 2014-09 will affect its noninterest income, primarily in the area of fees and service charges on deposit accounts. Based on the analysis performed, the Company did not have a material change in the timing or measurement of revenues related to noninterest income. The Company will continue to evaluate the effect that this guidance will have on other revenue streams within its scope, as well as changes in disclosures required by the new guidance. However, the Company do not expect this to have a material impact on the Company’s consolidated financial statements. In January 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-01 Financial Instruments-Overall: Recognition and Measurements of Financial Assets and Financial Liabilities. This ASU requires equity investments to be measured at fair value, with changes in fair value recognized in net income. The amendment also simplifies the impairment assessment of equity investments for which fair value is not readily determinable by requiring an entity to perform a qualitative assessment to identify impairment. Further, this ASU eliminates the requirement to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet, requires the use of the exit price notion when measuring the fair value of financial instruments for disclosure purposes, and requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. The ASU is effective for fiscal years beginning after December 15, 2017, and interim periods therein. The Company notes the impact of this standard was to recognize as of January 1, 2018 $262,000 in previously unrealized losses, related to its equity investments classified as available-for-sale, as an adjustment to retained earnings, and to reclassify $2,103,000 from retained earnings to accumulated other comprehensive income related to the instrument-specific credit risk of the Company's trust preferred securities (TRUPS). The Company does not expect any other significant impact from this ASU. In February 2016, FASB issued ASU 2016-02, Leases (Topic 842). The FASB is issuing this Update to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. To meet that objective, the FASB is amending the FASB Accounting Standards Codification® and creating Topic 842, Leases. This Update, along with IFRS 16, Leases, are the results of the FASB’s and the International Accounting Standards Board’s (IASB’s) efforts to meet that objective and improve financial reporting. This ASU will be effective for public business entities for annual periods beginning after December 15, 2018 (i.e., calendar periods beginning on January 1, 2019), and interim periods therein. Although an estimate of the impact of the new leasing standard has not yet been determined, the Company expects a significant new lease asset and related lease liability on the balance sheet due to the number of leased branches and standalone ATM sites the Bank currently has that are accounted for under current operating lease guidance. In June 2016, FASB issued ASU 2016-13, Financial Instruments- Credit Losses (Topic 326). The FASB is issuing this Update to improve financial reporting by requiring timelier recording of credit losses on loans and other financial instruments held by financial institutions and other organizations. The Update requires enhanced disclosures and judgments in estimating credit losses and also amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. This amendment is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The Company has established a project team for the implementation of this new standard. The team has started by working with a vendor to put a new Allowance for Loan Loss software in place and is collecting additional historical data to estimate the impact of this standard. An estimate of the impact of this standard has not yet been determined, however, the impact is expected to be significant. As of January 1, 2017, the Company adopted the Financial Accounting Standards Board's (FASB) Accounting Standard Update ("ASU") No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. ASU 2016-09, seeks to simplify several aspects of the accounting for employee share-based payment transactions, including income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. As required by ASU 2016-09, all adjustments are reflected as of the beginning of the fiscal year, January 1, 2016. By applying this ASU, the Company no longer adjusts common stock for the tax impact of shares released, instead the tax impact is recognized as tax expense in the period the shares are released. This simplifies the tracking of the excess tax benefits and deficiencies, but could cause volatility in tax expense for the periods presented. The statement of cash flows has been adjusted to reflect the provisions of this ASU. The application of this ASU did not have a material impact on the consolidated financial statements. In January 2017, FASB issued ASU 2017-04, Intangibles - Goodwill and Other (Topic 350). The FASB is issuing this Update to eliminate the requirement to calculate the implied fair value of goodwill to measure a goodwill impairment charge. Instead, entities will record an impairment charge based on the excess of a reporting unit's carrying amount over its fair value. This ASU will be effective for public business entities for annual periods beginning after December 15, 2019 (i.e. calendar periods beginning on January 1, 2020, and interim periods therein. The Company does not expect any impact on the Company's consolidated financial statements resulting from the adoption of this Update. In March 2017, FASB issued ASU 2017-08 - Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities. The provisions of the update require premiums recognized upon the purchase of callable debt securities to be amortized to the earliest call date in order to avoid losses recognized upon call. For public business entities that are SEC filers the amendments of the update will become effective in fiscal

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities Following is a comparison of the amortized cost and approximate fair value of investment securities at December 31, 2017 and December 31, 2016 : (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (Carrying Amount) December 31, 2017 Securities available for sale: U.S. Government agencies $ 19,683 $ 312 (41 ) $ 19,954 U.S. Government sponsored entities & agencies collateralized by mortgage obligations 22,391 56 (416 ) 22,031 Mutual Funds 4,000 — (263 ) 3,737 Total securities available for sale $ 46,074 $ 368 $ (720 ) $ 45,722 December 31, 2016 Securities available for sale: U.S. Government agencies $ 22,992 $ 280 $ (69 ) $ 23,203 U.S. Government sponsored entities & agencies collateralized by mortgage obligations 30,867 107 (402 ) 30,572 Mutual Funds 4,000 — (284 ) 3,716 Total securities available for sale $ 57,859 $ 387 $ (755 ) $ 57,491 There were no sales of securities and no gross realized losses on available-for-sale securities and no gross gains during the years ended December 31, 2017, 2016, and 2015 . There were no other-than-temporary impairment losses during the years ended December 31, 2017, 2016, and 2015 . The amortized cost and fair value of securities available for sale at December 31, 2017 , by contractual maturity, are shown below. Actual maturities may differ from contractual maturities because issuers have the right to call or prepay obligations with or without call or prepayment penalties. Contractual maturities on collateralized mortgage obligations cannot be anticipated due to allowed paydowns. Mutual funds are included in the "due in one year or less" category below. December 31, 2017 Amortized Cost Fair Value (Carrying Amount) (In thousands) Due in one year or less $ 4,000 $ 3,737 Due after one year through five years — — Due after five years through ten years 688 699 Due after ten years 18,995 19,255 U.S. Government sponsored entities & agencies collateralized by mortgage obligations 22,391 22,031 $ 46,074 $ 45,722 At December 31, 2017 and 2016 , available-for-sale securities with an amortized cost of approximately $34,780,746 and $19,653,625 (fair value of $34,542,543 and $16,670,290 ) were pledged as collateral for FHLB borrowings and public funds balances, respectively. The Company had no held-to-maturity or trading securities at December 31, 2017 and 2016 . Management periodically evaluates each available-for-sale investment security in an unrealized loss position to determine if the impairment is temporary or other-than-temporary. The following summarizes temporarily impaired investment securities at December 31, 2017 and 2016 : Less than 12 Months 12 Months or More Total (In thousands) Fair Value (Carrying Amount) Unrealized Losses Fair Value (Carrying Amount) Unrealized Losses Fair Value (Carrying Amount) Unrealized Losses December 31, 2017 Securities available for sale: U.S. Government agencies $ 1,728 $ (3 ) $ 6,625 $ (38 ) $ 8,353 $ (41 ) U.S. Government sponsored entities & agencies collateralized by mortgage obligations 7,483 (154 ) 13,583 (262 ) 21,066 (416 ) Mutual Funds — — 3,737 (263 ) 3,737 (263 ) Total impaired securities $ 9,211 $ (157 ) $ 23,945 $ (563 ) $ 33,156 $ (720 ) December 31, 2016 Securities available for sale: U.S. Government agencies $ 12,281 $ (69 ) $ — $ — $ 12,281 $ (69 ) U.S. Government sponsored entities & agencies collateralized by mortgage obligations 25,904 (402 ) — — 25,904 (402 ) Mutual Funds — — 3,716 (284 ) 3,716 (284 ) Total impaired securities $ 38,185 $ (471 ) $ 3,716 $ (284 ) $ 41,901 $ (755 ) Temporarily impaired securities at December 31, 2017 , were comprised of three U.S. Government agency security, eleven U.S. Government sponsored entities & agencies collateralized by mortgage obligations and one mutual fund with and undefined maturity date. Temporarily impaired securities at December 31, 2016 , were comprised of four U.S. Government agency security, eleven U.S. Government sponsored entities & agencies collateralized by mortgage obligations and one mutual fund, with an undefined maturity date. The Company evaluates investment securities for other-than-temporary impairment (“OTTI”) at least quarterly, and more frequently when economic or market conditions warrant such an evaluation. The investment securities portfolio is evaluated for OTTI by segregating the portfolio into two general segments and applying the appropriate OTTI model. Investment securities of high credit quality are generally evaluated for OTTI under ASC Topic 320-10, “ Investments – Debt and Equity Instruments .” Certain purchased beneficial interests, including non-agency mortgage-backed securities, asset-backed securities, and collateralized debt obligations, are evaluated under ASC Topic 325-40, " Beneficial Interest in Securitized Financial Assets." In the first segment, the Company considers many factors in determining OTTI, including: (1) the length of time and the extent to which the fair value has been less than cost, (2) the financial condition and near-term prospects of the issuer, (3) whether the market decline was affected by macroeconomic conditions, and (4) whether the Company has the intent to sell the debt security or more likely than not will be required to sell the debt security before its anticipated recovery. The assessment of whether an other-than-temporary decline exists involves a high degree of subjectivity and judgment and is based on the information available to the Company at the time of the evaluation. The second segment of the portfolio uses the OTTI guidance that is specific to purchased beneficial interests including private label mortgage-backed securities. Under this model, the Company compares the present value of the remaining cash flows as estimated at the preceding evaluation date to the current expected remaining cash flows. An OTTI is deemed to have occurred if there has been an adverse change in the remaining expected future cash flows. Other-than-temporary-impairment occurs when the Company intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis. If an entity intends to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis, the other-than-temporary-impairment shall be recognized in earnings equal to the entire difference between the investment’s amortized cost basis and its fair value at the balance sheet date. If an entity does not intend to sell the security and it is not more likely than not that the entity will be required to sell the security before recovery of its amortized cost basis, the other-than-temporary-impairment shall be separated into the amount representing the credit loss and the amount related to all other factors. The amount of the total other-than-temporary-impairment related to the credit loss is recognized in earnings, and is determined based on the difference between the present value of cash flows expected to be collected and the current amortized cost of the security. The amount of the total other-than-temporary-impairment related to other factors shall be recognized in other comprehensive (loss) income, net of applicable taxes. The previous amortized cost basis less the other-than-temporary-impairment recognized in earnings shall become the new amortized cost basis of the investment. At December 31, 2017 , the decline in fair value of the impaired mutual fund and U.S. government agency security is attributable to changes in interest rates, and not credit quality. Because the Company does not have the intent to sell these impaired securities, and it is not more likely than not that it will be required to sell these securities before its anticipated recovery, the Company does not consider these securities to be other-than-temporarily impaired at December 31, 2017 .

Loans

Loans	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Loans	Loans Loans are comprised of the following: In thousands) December 31, 2017 December 31, 2016 Commercial and Business loans $ 46,065 $ 47,464 Government Program Loans 961 1,541 Total Commercial and Industrial 47,026 49,005 Real estate – Mortgage: Commercial Real Estate 221,032 200,213 Residential Mortgages 84,804 87,388 Home Improvement and Home Equity loans 457 599 Total Real Estate Mortgage 306,293 288,200 Real Estate Construction and Development 122,970 130,687 Agricultural 59,481 56,918 Installment 65,581 44,949 Total Loans $ 601,351 $ 569,759 The Company's loans are predominantly in the San Joaquin Valley, and the greater Oakhurst/East Madera County area, as well as the Campbell area of Santa Clara County, although the Company does participate in loans with other financial institutions, primarily in the state of California. Commercial and industrial loans represent 7.8% of total loans at December 31, 2017 , and are generally made to support the ongoing operations of small-to-medium sized commercial businesses. Commercial and industrial loans have a high degree of industry diversification and provide, working capital, financing for the purchase of manufacturing plants and equipment, or funding for growth and general expansion of businesses. A substantial portion of commercial and industrial loans are secured by accounts receivable, inventory, leases or other collateral including real estate. The remainder are unsecured; however, extensions of credit are predicated upon the financial capacity of the borrower. Repayment of real estate mortgage loans generally comes from the cash flow of the borrower. Real estate mortgage loans, representing 50.9% of total loans at December 31, 2017 , are secured by trust deeds on primarily commercial property, but are also secured by trust deeds on single family residences. Repayment of real estate mortgage loans is generally from the cash flow of the borrower. • Commercial real estate mortgage loans comprise the largest segment of this loan category and are available on all types of income producing and commercial properties, including: office buildings, shopping centers; apartments and motels; owner occupied buildings; manufacturing facilities and more. Commercial real estate mortgage loans can also be used to refinance existing debt. Although real estate associated with the business is the primary collateral for commercial real estate mortgage loans, the underlying real estate is not the source of repayment. Commercial real estate loans are made under the premise that the loan will be repaid from the borrower's business operations, rental income associated with the real property, or personal assets. • Residential mortgage loans are provided to individuals to finance or refinance single-family residences. Residential mortgages are not a primary business line offered by the Company, and a majority are conventional mortgages that were purchased as a pool. Most residential mortgages originated by the Company are of a shorter term than conventional mortgages, with maturities ranging from three to fifteen years on average. • Home Improvement and Home Equity loans comprise a relatively small portion of total real estate mortgage loans, and are offered to borrowers for the purpose of home improvements, although the proceeds may be used for other purposes. Home equity loans are generally secured by junior trust deeds, but may be secured by 1 st trust deeds. Real estate construction and development loans, representing 20.4% of total loans at December 31, 2017 , consist of loans for residential and commercial construction projects, as well as land acquisition and development, or land held for future development. Loans in this category are secured by real estate including improved and unimproved land, as well as single-family residential, multi-family residential, and commercial properties in various stages of completion. All real estate loans have established equity requirements. Repayment on construction loans is generally from long-term mortgages with other lending institutions obtained at completion of the project. Agricultural loans represent 9.9% of total loans at December 31, 2017 , and are generally secured by land, equipment, inventory and receivables. Repayment is from the cash flow of the borrower. Installment loans represent 10.9% of total loans at December 31, 2017 and generally consist of loans to individuals for household, family, student loans, and other personal expenditures such as credit cards, automobiles or other consumer items. Included in installment loans are $60,595,000 in student loans made to medical and pharmacy school students. Upon graduation the loan is automatically placed on deferment for 6 months. This may be extended up to 48 months for graduates enrolling in Internship, Medical Residency or Fellowship. As approved the student may receive additional deferment for hardship or administrative reasons in the form of forbearance for a maximum of 24 months throughout the life of the loan. These loans are typically insured through a Surety Bond issued by ReliaMax Surety Company and provide the Company reasonable expectation of collection. Accrued interest on loans that have not entered repayment status totaled $4,261,000 at December 31, 2017 . At December 31, 2017 there were 180 loans within repayment, deferment, and forbearance which represented $6,473,000 , $1,128,000 , and $1,981,000 respectively. In the normal course of business, the Company is party to financial instruments with off-balance sheet risk to meet the financing needs of its customers. At December 31, 2017 and 2016 , these financial instruments include commitments to extend credit of $99,958,000 and $120,485,000 , respectively, and standby letters of credit of $2,058,000 and $1,201,000 , respectively. These instruments involve elements of credit risk in excess of the amount recognized on the balance sheet. The contract amounts of these instruments reflect the extent of the involvement the Company has in off-balance sheet financial instruments. The Company’s exposure to credit loss in the event of nonperformance by the counterparty to the financial instrument for commitments to extend credit and standby letters of credit is represented by the contractual amounts of those instruments. The Company uses the same credit policies as it does for on-balance sheet instruments. 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. Substantially all of these commitments are at floating interest rates based on the Prime rate. Commitments generally have fixed expiration dates. The Company evaluates each customer's creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary, is based on management's credit evaluation. Collateral held varies but includes accounts receivable, inventory, leases, property, plant and equipment, residential real estate and income-producing properties. Standby letters of credit are generally unsecured and are issued by the Company to guarantee the performance of a customer to a third party. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loans to customers. Loans to directors, officers, principal shareholders and their affiliates are summarized below: December 31, (In thousands) 2017 2016 2015 Aggregate amount outstanding, beginning of year $ 5,838 $ 3,754 $ 2,120 New loans or advances during year 440 3,788 3,946 Repayments during year (2,549 ) (1,704 ) (2,312 ) Aggregate amount outstanding, end of year $ 3,729 $ 5,838 $ 3,754 Undisbursed commitments, end of year $ 7,470 $ 4,891 $ 7,431 Past Due Loans The Company monitors delinquency and potential problem loans on an ongoing basis through weekly reports to the Loan Committee and monthly reports to the Board of Directors. The following is a summary of delinquent loans at December 31, 2017 (in thousands): December 31, 2017 Loans 30-60 Days Past Due Loans 61-89 Days Past Due Loans 90 or More Days Past Due Total Past Due Loans Current Loans Total Loans Accruing Loans 90 or More Days Past Due Commercial and Business Loans $ — $ — $ 212 $ 212 $ 45,853 $ 46,065 $ — Government Program Loans — — — — 961 961 — Total Commercial and Industrial — — 212 212 46,814 47,026 — Commercial Real Estate Loans 779 — — 779 220,253 221,032 — Residential Mortgages — — 94 94 84,710 84,804 — Home Improvement and Home Equity Loans — — — — 457 457 — Total Real Estate Mortgage 779 — 94 873 305,420 306,293 — Real Estate Construction and Development Loans — — 360 360 122,610 122,970 360 Agricultural Loans — — — — 59,481 59,481 — Consumer Loans — — — — 65,446 65,446 125 Overdraft protection Lines — — — — 38 38 — Overdrafts — — — — 97 97 — Total Installment — — — — 65,581 65,581 125 Total Loans $ 779 $ — $ 666 $ 1,445 $ 599,906 $ 601,351 $ 485 The following is a summary of delinquent loans at December 31, 2016 (in thousands): December 31, 2016 Loans 30-60 Days Past Due Loans 61-89 Days Past Due Loans 90 or More Days Past Due Total Past Due Loans Current Loans Total Loans Accruing Loans 90 or More Days Past Due Commercial and Business Loans $ — $ 432 $ — $ 432 $ 48,009 $ 48,441 $ — Government Program Loans — — 290 290 1,251 1,541 — Total Commercial and Industrial — 432 290 722 49,260 49,982 — Commercial Real Estate Loans — — — — 199,810 199,810 — Residential Mortgages — — — — 87,388 87,388 — Home Improvement and Home Equity Loans — — — — 599 599 — Total Real Estate Mortgage — — — — 287,797 287,797 — Real Estate Construction and Development Loans 166 — 1,250 1,416 128,697 130,113 1,250 Agricultural Loans — — — — 56,918 56,918 — Consumer Loans — — 965 965 43,785 44,750 — Overdraft protection Lines — — — — 48 48 — Overdrafts — — — — 151 151 — Total Installment — — 965 965 43,984 44,949 — Total Loans $ 166 $ 432 $ 2,505 $ 3,103 $ 566,656 $ 569,759 $ 1,250 Nonaccrual Loans Commercial, construction and commercial real estate loans are placed on non-accrual status under the following circumstances: - When there is doubt regarding the full repayment of interest and principal. - When principal and/or interest on the loan has been in default for a period of 90 -days or more, unless the asset is both well secured and in the process of collection that will result in repayment in the near future. - When the loan is identified as having loss elements and/or is risk rated "8" Doubtful. Other circumstances which jeopardize the ultimate collectability of the loan including certain troubled debt restructurings, identified loan impairment, and certain loans to facilitate the sale of OREO. Loans meeting any of the preceding criteria are placed on non-accrual status and the accrual of interest for financial statement purposes is discontinued. Previously accrued but unpaid interest is reversed and charged against interest income. For student loans there is a reasonable expectation of collection, principal and accrued interest, as these loans are typically insured through a Surety Bond issued by ReliaMax Surety Company. If a loan were to be delinquent 120 days a claim would be filed through ReliaMax and typically paid within 180 days. At that point in time if a student loan is due and unpaid for 180 days or more it would be placed on non-accrual and the accrual of interest for financial statement purposes would be discontinued. All other loans where principal or interest is due and unpaid for 90 days or more are placed on non-accrual, provided they are not well secured and in the process of collection, and the accrual of interest for financial statement purposes is discontinued. Previously accrued but unpaid interest is reversed and charged against interest income. When a loan is placed on non-accrual status and subsequent payments of interest (and principal) are received, the interest received may be accounted for in two separate ways. Cost recovery method : If the loan is in doubt as to full collection, the interest received in subsequent payments is diverted from interest income to a valuation reserve and treated as a reduction of principal for financial reporting purposes. Cash basis : This method is only used if the recorded investment or total contractual amount is expected to be fully collectible, under which circumstances the subsequent payments of interest is credited to interest income as received. Loans on non-accrual status are usually not returned to accruing status unless and until all delinquent principal and/or interest has been brought current, there is no identified element of loss, and current and continued satisfactory performance is expected (loss of the contractual amount not the carrying amount of the loan). Repayment ability is generally demonstrated through the timely receipt of at least six monthly payments on a loan with monthly amortization. There were no remaining undisbursed commitments to extend credit on nonaccrual loans at December 31, 2017 and 2016 . The following is a summary of nonaccrual loan balances at December 31, 2017 and 2016 (in thousands). December 31, 2017 December 31, 2016 Commercial and Business Loans $ 212 $ 275 Government Program Loans — 290 Total Commercial and Industrial 212 565 Commercial Real Estate Loans 454 1,126 Residential Mortgages 288 — Home Improvement and Home Equity Loans — — Total Real Estate Mortgage 742 1,126 Real Estate Construction and Development Loans 4,342 4,608 Agricultural Loans — — Consumer Loans — 965 Total Installment — 965 Total Loans $ 5,296 $ 7,264 Impaired Loans A loan is considered impaired when based on current information and events, it is probable that the Company will be unable to collect all amounts due, including principal and interest, according to the contractual terms of the loan agreement. The Company applies its normal loan review procedures in making judgments regarding probable losses and loan impairment. The Company evaluates for impairment those loans on nonaccrual status, graded doubtful, graded substandard or those that are troubled debt restructures. The primary basis for inclusion in impaired status under generally accepted accounting pronouncements is that it is probable that the Bank will be unable to collect all amounts due according to the contractual terms of the loan agreement. A loan is not considered impaired if there is merely an insignificant delay or shortfall in the amounts of payments and the Company expects to collect all amounts due, including interest accrued, at the contractual interest rate for the period of the delay. Review for impairment does not include large groups of smaller balance homogeneous loans that are collectively evaluated to estimate the allowance for loan losses. The Company’s present allowance for loan losses methodology, including migration analysis, captures required reserves for these loans in the formula allowance. For loans determined to be impaired, the Company evaluates impairment based upon either the fair value of underlying collateral, discounted cash flows of expected payments, or observable market price. - For loans secured by collateral including real estate and equipment, the fair value of the collateral less selling costs will determine the carrying value of the loan. The difference between the recorded investment in the loan and the fair value, less selling costs, determines the amount of impairment. The Company uses the measurement method based on fair value of collateral when the loan is collateral dependent and foreclosure is probable. For loans that are not considered collateral dependent, a discounted cash flow methodology is used. - The discounted cash flow method of measuring the impairment of a loan is used for impaired loans that are not considered to be collateral dependent. Under this method, the Company assesses both the amount and timing of cash flows expected from impaired loans. The estimated cash flows are discounted using the loan's effective interest rate. The difference between the amount of the loan on the Bank's books and the discounted cash flow amounts determines the amount of impairment to be provided. This method is used for most of the Company’s troubled debt restructurings or other impaired loans where some payment stream is being collected. - The observable market price method of measuring the impairment of a loan is only used by the Company when the sale of loans or a loan is in process. The method for recognizing interest income on impaired loans is dependent on whether the loan is on nonaccrual status or is a troubled debt restructure. For income recognition, the existing nonaccrual and troubled debt restructuring policies are applied to impaired loans. Generally, except for certain troubled debt restructurings which are performing under the restructure agreement, the Company does not recognize interest income received on impaired loans, but reduces the carrying amount of the loan for financial reporting purposes. Loans other than certain homogeneous loan portfolios are reviewed on a quarterly basis for impairment. Impaired loans are written down to estimated realizable values by the establishment of specific reserves for loan utilizing the discounted cash flow method, or charge-offs for collateral-based impaired loans, or those using observable market pricing. The following is a summary of impaired loans at December 31, 2017 (in thousands). December 31, 2017 Unpaid Contractual Principal Balance Recorded Investment With No Allowance (1) Recorded Investment With Allowance (1) Total Recorded Investment Related Allowance Average Recorded Investment (2) Interest Recognized (2) Commercial and Business Loans $ 3,255 $ 381 $ 2,887 $ 3,268 $ 534 $ 3,791 $ 229 Government Program Loans 49 50 — 50 — 219 5 Total Commercial and Industrial 3,304 431 2,887 3,318 534 4,010 234 Commercial Real Estate Loans 1,233 — 1,245 1,245 385 1,138 79 Residential Mortgages 3,040 1,199 1,852 3,051 103 2,745 142 Home Improvement and Home Equity Loans — — — — — — — Total Real Estate Mortgage 4,273 1,199 3,097 4,296 488 3,883 221 Real Estate Construction and Development Loans 5,951 5,972 — 5,972 — 6,660 418 Agricultural Loans 1,200 1 1,203 1,204 866 1,179 48 Consumer Loans — — — — — 241 — Total Installment — — — — — 241 — Total Impaired Loans $ 14,728 $ 7,603 $ 7,187 $ 14,790 $ 1,888 $ 15,973 $ 921 (1) The recorded investment in loans includes accrued interest receivable of $ 62 . (2) Information is based on the twelve month period ended December 31, 2017 . The following is a summary of impaired loans at December 31, 2016 (in thousands). December 31, 2016 Unpaid Contractual Principal Balance Recorded Recorded Total Related Allowance Average Interest Recognized (2) Commercial and Business Loans $ 4,635 $ 495 $ 4,158 $ 4,653 $ 757 $ 5,050 $ 302 Government Program Loans 356 356 — 356 — 372 20 Total Commercial and Industrial 4,991 851 4,158 5,009 757 5,422 322 Commercial Real Estate Loans 1,454 — 1,456 1,456 450 1,503 89 Residential Mortgages 2,467 526 1,949 2,475 153 2,874 138 Home Improvement and Home Equity Loans — — — — — — — Total Real Estate Mortgage 3,921 526 3,405 3,931 603 4,377 227 Real Estate Construction and Development Loans 6,267 6,274 — 6,274 — 8,794 361 Agricultural Loans — — — — — 5 8 Consumer Loans 965 965 — 965 — 968 35 Total Installment 965 965 — 965 — 968 35 Total Impaired Loans $ 16,144 $ 8,616 $ 7,563 $ 16,179 $ 1,360 $ 19,566 $ 953 (1) The recorded investment in loans includes accrued interest receivable of $ 35 . (2) Information is based on the twelve month period ended December 31, 2016 . The following is a summary of impaired loans at December 31, 2015 (in thousands). December 31, 2015 Unpaid Contractual Principal Balance Recorded Recorded Total Related Allowance Average Interest Recognized (2) Commercial and Business Loans $ 4,855 $ 541 $ 4,333 $ 4,874 $ 530 $ 2,537 $ 302 Government Program Loans 327 327 — 327 — 358 29 Total Commercial and Industrial 5,182 868 4,333 5,201 530 2,895 331 Commercial Real Estate Loans 1,243 — 1,243 1,243 477 1,618 74 Residential Mortgages 4,032 1,051 2,999 4,050 158 4,092 185 Home Improvement and Home Equity Loans — — — — — 11 — Total Real Estate Mortgage 5,275 1,051 4,242 5,293 635 5,721 259 Real Estate Construction and Development Loans 12,489 5,340 7,179 12,519 1,282 7,781 820 Agricultural Loans 16 16 — 16 — 22 9 Consumer Loans 650 — 650 650 650 1,043 21 Overdraft protection Lines — — — — — — — Overdrafts — — — — — — — Total Installment 650 — 650 650 650 1,043 21 Total Impaired Loans $ 23,612 $ 7,275 $ 16,404 $ 23,679 $ 3,097 $ 17,462 $ 1,440 (1) The recorded investment in loans includes accrued interest receivable of $67 . (2) Information is based on the twelve month period ended December 31, 2015 . In most cases, the Company uses the cash basis method of income recognition for impaired loans. In the case of certain troubled debt restructuring for which the loan is performing under the current contractual terms for a reasonable period of time, income is recognized under the accrual method. Troubled Debt Restructurings Under the circumstances, when the Company grants a concession to a borrower as part of a loan restructuring, the restructuring is accounted for as a troubled debt restructuring (TDR). TDRs are reported as a component of impaired loans. A TDR is a type of restructuring in which the Company, for economic or legal reasons related to the borrower's financial difficulties, grants a concession (either imposed by court order, law, or agreement between the borrower and the Bank) to the borrower that it would not otherwise consider. Although the restructuring may take different forms, the Company's objective is to maximize recovery of its investment by granting relief to the borrower. A TDR may include, but is not limited to, one or more of the following: - A transfer from the borrower to the Company of receivables from third parties, real estate, other assets, or an equity interest in the borrower is granted to fully or partially satisfy the loan. - A modification of terms of a debt such as one or a combination of: ◦ The reduction (absolute or contingent) of the stated interest rate. ◦ The extension of the maturity date or dates at a stated interest rate lower than the current market rate for new debt with similar risk. ◦ The reduction (absolute or contingent) of the face amount or maturity amount of debt as stated in the instrument or agreement. ◦ The reduction (absolute or contingent) of accrued interest. For a restructured loan to return to accrual status there needs to be, among other factors, at least 6 months successful payment history. In addition, the Company performs a financial analysis of the credit to determine whether the borrower has the ability to continue to meet payments over the remaining life of the loan. This includes, but is not limited to, a review of financial statements and cash flow analysis of the borrower. Only after determination that the borrower has the ability to perform under the terms of the loans, will the restructured credit be considered for accrual status. Although the Company does not have a policy which specifically addresses when a loan may be removed from TDR classification, as a matter of practice, loans classified as TDRs generally remain classified as such until the loan either reaches maturity or its outstanding balance is paid off. The following tables illustrate TDR activity for the periods indicated (dollars in thousands): Year ended December 31, 2017 Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Number of Contracts in Default Recorded Investment on Defaulted TDRs Troubled Debt Restructurings Commercial and Business Loans 1 $ 69 $ 69 — $ — Government Program Loans 1 178 178 — — Commercial Real Estate Term Loans — — — — — Single Family Residential Loans 2 404 404 — — Home Improvement and Home Equity Loans — — — — — Real Estate Construction and Development Loans 1 790 790 1 288 Agricultural Loans 3 2,112 2,112 — — Consumer Loans — — — — — Overdraft protection Lines — — — — — Total Loans 8 $ 3,553 $ 3,553 1 $ 288 Year ended December 31, 2016 Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Number of Contracts in Default Recorded Investment on Defaulted TDRs Troubled Debt Restructurings Commercial and Business Loans 5 $ 1,295 $ 1,024 1 $ 290 Government Program Loans 1 100 100 — — Commercial Real Estate Term Loans — — — — — Single Family Residential Loans — — — — — Home Improvement and Home Equity Loans — — — — — Real Estate Construction and Development Loans 1 1,246 1,246 — — Agricultural Loans — — — — — Consumer Loans — — — — — Overdraft protection Lines — — — — — Total Loans 7 $ 2,641 $ 2,370 1 $ 290 December 31, 2015 Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Number of Contracts in Default Recorded Investment on Defaulted TDRs Troubled Debt Restructurings Commercial and Business Loans 1 $ 81 $ 76 — $ — Government Program Loans — — — — — Commercial Real Estate Term Loans — — — — — Single Family Residential Loans 1 258 248 — — Home Improvement and Home Equity Loans — — — — — Real Estate Construction and Development Loans 1 6,446 6,446 — — Agricultural Loans — — — — — Consumer Loans — — — — — Overdraft protection Lines — — — — — Total Loans 3 $ 6,785 $ 6,770 — $ — The following tables summarize TDR activity by loan category for the years ended December 31, 2017, 2016, and 2015 (in thousands). Twelve Months Ended December 31, 2017 Commercial and Industrial Commercial Real Estate Residential Mortgages Home Equity Real Estate Construction and Development Agricultural Installment & Other Total Beginning balance $ 1,356 $ 1,454 $ 2,368 $ — $ 6,267 $ — $ 965 $ 12,410 Defaults — — — — (288 ) — — (288 ) Additions 247 — 404 — 790 2,112 — 3,553 Principal reductions (1,139 ) (221 ) (221 ) — (818 ) (912 ) (965 ) (4,276 ) Charge-offs (28 ) — (9 ) — — — — (37 ) Ending balance $ 436 $ 1,233 $ 2,542 $ — $ 5,951 $ 1,200 $ — $ 11,362 Allowance for loan loss $ 9 $ 385 $ 109 $ — $ — $ 866 $ — $ 1,369 Twelve Months Ended December 31, 2016 Commercial and Industrial Commercial Real Estate Residential Mortgages Home Equity Real Estate Construction and Development Agricultural Installment & Other Total Beginning balance $ 898 $ 1,243 $ 3,533 $ — $ 12,168 $ 16 $ 650 $ 18,508 Defaults (290 ) — — — — — — (290 ) Additions 1,579 1,246 — — — — — 2,825 Principal reductions — (1,035 ) (1,144 ) — (5,901 ) (16 ) 315 (7,781 ) Charge-offs (831 ) — (21 ) $ — $ — $ — $ — (852 ) Ending balance $ 1,356 $ 1,454 $ 2,368 $ — $ 6,267 $ — $ 965 $ 12,410 Allowance for loan loss $ 104 $ 453 $ 157 $ — $ — $ — $ — $ 714 Twelve Months Ended December 31, 2015 Commercial and Industrial Commercial Real Estate Residential Mortgages Home Equity Real Estate Construction and Development Agricultural Installment & Other Total Beginning balance $ 1,306 $ 2,713 $ 4,225 $ — $ 6,029 $ 32 $ 695 $ 15,000 Defaults — — — — — — — — Additions 76 — 248 — 6,446 — — 6,770 — Principal reductions (448 ) (1,470 ) (940 ) — (307 ) (16 ) (45 ) (3,226 ) Charge-offs (36 ) — — — — — — (36 ) Ending balance $ 898 $ 1,243 $ 3,533 $ — $ 12,168 $ 16 $ 650 $ 18,508 Allowance for loan loss $ 32 $ 477 $ 149 $ — $ 384 $ — $ 650 $ 1,692 The Company makes various types of concessions when structuring TDRs including rate reductions, payment extensions, and forbearance. At December 31, 2017 , the Company had 25 restructured loans totaling $11,362,000 , as compared to 28 restructured loans totaling $12,410,000 at December 31, 2016 . The Company had no unfunded commitments standing for TDRs at December 31, 2017 and December 31, 2016 , Credit Quality Indicators As part of its credit monitoring program, the Company utilizes a risk rating system which quantifies the risk the Company estimates it has assumed during the life of a loan. The system rates the strength of the borrower and the facility or transaction, and is designed to provide a program for risk management and early detection of problems. For each new credit approval, credit extension, renewal, or modification of existing credit facilities, the Company assigns risk ratings utilizing the rating scale identified in this policy. In addition, on an on-going basis, loans and credit facilities are reviewed for internal and external influences impacting the credit facility that would warrant a change in the risk rating. Each loan credit facility is to be given a risk rating that takes into account factors that materially affect credit quality. When assigning risk ratings, the Company evaluates two risk rating approaches, a facility rating and a borrower rating as follows. Facility Rating: The facility rating is determined by the analysis of positive and negative factors that may indicate that the quality of a particular loan or credit arrangement requires that it be rated differently from the risk rating assigned to the borrower. The Company assesses the risk impact of these factors: Collateral - The rating may be affected by the type and quality of the collateral, the degree of coverage, the economic life of the collateral, liquidation value and the Company's ability to dispose of the collateral. Guarantees - The value of third party support arrangements varies widely. Unconditional guaranties from persons with demonstrable ability to perform are more substantial than that of closely related persons to the borrower who offer only modest support. Unusual Terms - Credit may be extended on terms that subject the Company to a higher level of risk than indicated in the rating of the borrower. Borrower Rating: The borrower rating is a measure of loss possibility based on the historical, current and anticipated financial characteristics of the borrower in the current risk environment. To determine the rating, the Company considers at least the following factors: - Quality of management - Liquidity - Leverage/capitalization - Profit margins/earnings trend - Adequacy of financial records - Alternative funding sources - Geographic risk - Industry risk - Cash flow risk - Accounting practices - Asset protection - Extraordinary risks The Company assigns risk ratings to loans other than consumer loans and other homogeneous loan pools based on the following scale. The risk ratings are used when determining borrower ratings as well as facility ratings. When the borrower rating and the facility ratings differ, the lowest rating applied is: - Grades 1 and 2 – These grades include loans which are given to high quality borrowers with high credit quality and sound financial strength. Key financial ratios are generally above industry averages and the borrower’s strong earnings history or net worth. These may be secured by deposit accounts or high-grade investment securities. - Grade 3 – This grade includes loans to borrowers with solid credit quality with minimal risk. The borrower’s balance sheet and financial ratios are generally in line with industry averages, and the borrower has historically demonstrated the ability to manage economic adversity. Real estate and asset-based loans assigned this risk rating must have characteristics, which place them well above the minimum underwriting requirements for those departments. Asset-based borrowers assigned this rating must exhibit extremely favorable leverage and cash flow characteristics, and consistently demonstrate a high level of unused borrowing capacity. - Grades 4 and 5 – These include “pass” grade loans to borrowers of acceptable credit quality and risk. The borrower’s balance sheet and financial ratios may be below industry averages, but above the lowest industry quartile. Leverage is above and liquidity is below industry averages. Inadequacies evident in financial performance and/or management sufficiency are offset by readily available features of support, such as adequate collateral, or good guarantors having the liquid assets and/or cash flow capacity to repay the debt. The borrower may have recognized a loss over three or four years, however recent earnings trends, while perhaps somewhat cyclical, are improving and cash flows are adequate to cover debt service and fixed obligations. Real estate and asset-borrowers fully comply with all underwriting standards and are performing according to projections would be assigned this rating. These also include grade 5 loans which are “leveraged” or on management’s “watch list.” While still considered pass loans (loans given a grade 5), the borrower’s financial condition, cash flow or operations evidence more th

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Premises and Equipment	Premises and Equipment The components of premises and equipment are as follows: (In thousands) December 31, 2017 December 31, 2016 Land $ 968 $ 968 Buildings and improvements 15,648 14,841 Furniture and equipment 9,642 9,501 26,258 25,310 Less accumulated depreciation and amortization (16,093 ) (14,865 ) Total premises and equipment $ 10,165 $ 10,445 Total depreciation expense on Company premises and equipment totaled $1,335,000 , $1,428,000 , and $1,462,000 for the years ended December 31, 2017, 2016, and 2015 , respectively, and is included in occupancy expense in the accompanying consolidated statements of operations.

Investment in Limited Partnersh

Investment in Limited Partnership	12 Months Ended
	Dec. 31, 2017
Equity Method Investments and Joint Ventures [Abstract]
Investment in Limited Partnership	Investment in Limited Partnership The Bank owns limited interests in private limited partnerships that acquire affordable housing properties in California that generate Low Income Housing Tax Credits under Section 42 of the Internal Revenue Code of 1986, as amended. The Bank's limited partnership investment is accounted for under the equity method. The Bank's noninterest expense associated with the utilization and expiration of these tax credits for the years ended December 31, 2017, 2016, and 2015 was $109,000 , $158,000 , and $73,000 respectively. These limited partnership investments are expected to generate tax credits of approximately $1.8 million over the life of the investment. No tax credits were available for income tax purposes for the years ended December 31, 2017, 2016, and 2015 . The Bank owns a 9.14% interest in a limited partnership which provides private capital for small to mid-sized businesses used to finance later stage growth, strategic acquisitions, ownership transitions, and recapitalizations, or mezzanine capital. At December 31, 2017 , the total investment in limited partnerships was $1,601,000 , which was accounted for under the equity method. Income for the years ended December 31, 2017, 2016, and 2015 was $7,000 , $900 , and $0 respectively.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2017
Deposits [Abstract]
Deposits	Deposits Deposits include the following: (In thousands) December 31, 2017 December 31, 2016 Noninterest-bearing deposits $ 307,299 $ 262,697 Interest-bearing deposits: NOW and money market accounts 234,154 235,873 Savings accounts 81,408 75,068 Time deposits: Under $250,000 51,687 87,419 $250,000 and over 13,145 15,572 Total interest-bearing deposits 380,394 413,932 Total deposits $ 687,693 $ 676,629 At December 31, 2017 , the scheduled maturities of all certificates of deposit and other time deposits are as follows: (In thousands) December 31, 2017 One year or less $ 48,704 More than one year, but less than or equal to two years 13,460 More than two years, but less than or equal to three years 738 More than three years, but less than or equal to four years 508 More than four years, but less than or equal to five years 1,422 More than five years — $ 64,832 The Company may utilize brokered deposits as an additional source of funding. At December 31, 2017 and 2016 , the Company held brokered time deposits totaling $7,421,000 and $28,132,000 , respectively. All brokered time deposits are include in time deposits of less than $250,000 . Included in brokered time deposits at December 31, 2017 are balances totaling $6,535,000 maturing in three months or less and $485,000 maturing in 3 months to a year. Deposit balances representing overdrafts reclassified as loan balances totaled $293,000 and $283,000 as of December 31, 2017 and 2016 , respectively. Deposits of directors, officers and other related parties to the Bank totaled $8,747,000 and $9,299,000 at December 31, 2017 and 2016 , respectively. The rates paid on these deposits were similar to those customarily paid to the Bank’s customers in the normal course of business.

Short-term Borrowings_Other Bor

Short-term Borrowings/Other Borrowings	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Short-term Borrowings/Other Borrowings	Short-term Borrowings/Other Borrowings At December 31, 2017 , the Company had collateralized lines of credit with the Federal Reserve Bank of San Francisco totaling $305,236,000 , as well as Federal Home Loan Bank (“FHLB”) lines of credit totaling $13,363,000 . At December 31, 2017 , the Company had an uncollateralized line of credit with Pacific Coast Bankers Bank ("PCBB") and Union Bank totaling $10,000,000 each and a Fed Funds line of $20,000,000 with Zions First National Bank. At December 31, 2017 , and for the year then ended, the Company had no outstanding borrowing balances. All lines of credit are on an “as available” basis and can be revoked by the grantor at any time. These lines of credit have interest rates that are generally tied to the Federal Funds rate or are indexed to short-term U.S. Treasury rates or LIBOR. FHLB advances are collateralized by the Company’s stock in the FHLB, investment securities, and certain qualifying mortgage loans. As of December 31, 2017 , $17,049,000 in investment securities at FHLB were pledged as collateral for FHLB advances. Additionally, $473,364,000 in real estate-secured loans were pledged at December 31, 2017 , as collateral for used and unused borrowing lines with the Federal Reserve Bank totaling $305,236,000 . The Company had collateralized lines of credit with the Federal Reserve Bank of San Francisco totaling $323,162,000 , as well as Federal Home Loan Bank (“FHLB”) lines of credit totaling $2,037,000 at December 31, 2016 . At December 31, 2016 , the Company had an uncollateralized line of credit with Pacific Coast Bankers Bank ("PCBB") totaling $10,000,000 and a Fed Funds line of $20,000,000 with Zions First National Bank. These lines of credit generally have interest rates tied to the Federal Funds rate or are indexed to short-term U.S. Treasury rates or LIBOR. FHLB advances are collateralized by the Company’s stock in the FHLB, investment securities, and certain qualifying mortgage loans. As of December 31, 2016 , $2,152,000 in investment securities at FHLB were pledged as collateral for FHLB advances. Additionally, $470,881,000 in secured and unsecured loans were pledged at December 31, 2016 , as collateral for used and unused borrowing lines with the Federal Reserve Bank totaling $323,162,000 . At December 31, 2016 , and for the year then ended, the Company had no outstanding borrowing balances. All lines of credit are on an “as available” basis and can be revoked by the grantor at any time.

Junior Subordinated Debt_Trust

Junior Subordinated Debt/Trust Preferred Securities	12 Months Ended
	Dec. 31, 2017
Junior Subordinated Debt/Trust Preferred Securities [Abstract]
Junior Subordinated Debt/Trust Preferred Securities	Junior Subordinated Debt/Trust Preferred Securities During July 2007, the Company formed USB Capital Trust II, a wholly-owned special purpose entity, for the purpose of issuing Trust Preferred Securities. USB Capital Trust II is a Variable Interest Entity (VIE) and a deconsolidated entity pursuant to ASC 810. On July 23, 2007, USB Capital Trust II issued $15 million in Trust Preferred securities. The securities have a thirty -year maturity and bear a floating rate of interest (repricing quarterly) of 1.29% over the three-month LIBOR rate (initial coupon rate of 6.65% ). Interest will be paid quarterly. Concurrent with the issuance of the Trust Preferred securities, USB Capital Trust II used the proceeds of the Trust Preferred securities offering to purchase a like amount of junior subordinated debentures of the Company. The Company will pay interest on the junior subordinated debentures to USB Capital Trust II, which represents the sole source of dividend distributions to the holders of the Trust Preferred securities. The Company may redeem the junior subordinated debentures at anytime at par. The Company elected the fair value measurement option for all the Company’s new junior subordinated debentures issued under USB Capital Trust II. Effective September 30, 2009 and beginning with the quarterly interest payment due October 1, 2009, the Company elected to defer interest payments on the Company’s $15.0 million of junior subordinated debentures relating to its trust preferred securities. The terms of the debentures and trust indentures allow for the Company to defer interest payments for up to 20 consecutive quarters without default or penalty. During the period that the interest deferrals were elected, the Company continued to record interest expense associated with the debentures. As of June 30, 2014, the Company ended the extension period, paid all accrued and unpaid interest, and is currently making quarterly interest payments. At December 31, 2017 and 2016 , the Company had $80,000 and $64,000 , respectively, in accrued and unpaid interest on the junior subordinated debt. During August 2015, the Bank purchased $3.0 million of the Company's junior subordinated debentures related to the Company's trust preferred securities at a fair value discount of 40% . Subsequently, in September 2015, the Company purchased those shares from the Bank and canceled $3.0 million in par value of the junior subordinated debentures, realizing a $78,000 gain on redemption. The contractual principal balance of the Company's debentures relating to its trust preferred securities is $12.0 million as of December 31, 2017 . At December 31, 2017 , as with previous periods, the Company performed a fair value measurement analysis on its junior subordinated debt using a discounted cash flow valuation model approach to determine the present value of those cash flows. The cash flow model utilizes the forward 3-month LIBOR curve to estimate future quarterly interest payments due over the life of the debt instrument. These cash flows were discounted at a rate which incorporates a current market rate for similar-term debt instruments, adjusted for additional credit and liquidity risks associated with the junior subordinated debt. We believe the 5.81% discount rate used represents what a market participant would consider under the circumstances based on current market assumptions. At December 31, 2017 , the total cumulative gain recorded on the debt is $2,814,000 . The fair value calculation performed resulted in realized losses of $882,000 , $518,000 , and $73,000 for the years ended December 31, 2017, 2016, and 2015 , respectively. Fair value gains and losses are reflected as a component of noninterest income.

Taxes on Income

Taxes on Income	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Taxes on Income	Taxes on Income The tax effects of significant items comprising the Company’s net deferred tax assets (liabilities) are as follows: December 31, (In thousands) 2017 2016 Deferred tax assets: Credit losses not currently deductible $ 3,055 $ 4,151 Deferred compensation 1,300 1,782 Depreciation 324 51 Accrued reserves 90 200 Write-down on other real estate owned 35 534 Unrealized gain on AFS 196 415 Unrealized gain on retirement obligation 104 — Interest on nonaccrual loans 29 36 Other 361 1,897 Total deferred tax assets 5,494 9,066 Deferred tax liabilities: State Tax (152 ) (1,087 ) FHLB dividend (46 ) (65 ) Loss on limited partnership investment (873 ) (1,222 ) Deferred gain ASC 825 – fair value option (896 ) (1,657 ) Fair value adjustments for purchase accounting (99 ) (139 ) Deferred loan costs (835 ) (1,318 ) Specific reserve charge-offs (43 ) — Prepaid expenses (161 ) (280 ) Total deferred tax liabilities (3,105 ) (5,768 ) Net deferred tax assets $ 2,389 $ 3,298 The Company periodically evaluates its deferred tax assets to determine whether a valuation allowance is required based upon a determination that some or all of the deferred assets may not be ultimately realized. The Company did not record a valuation allowance at December 31, 2017 or December 31, 2016 . Income tax expense for the years ended December 31, consist of the following: (In thousands) 2017 Federal State Total Current $ 4,745 $ 1,388 $ 6,133 Deferred (881 ) 1,787 906 $ 3,864 $ 3,175 $ 7,039 2016 Current $ 2,642 $ 28 $ 2,670 Deferred 941 1,258 2,199 $ 3,583 $ 1,286 $ 4,869 2015 Current $ 2,847 $ 10 $ 2,857 Deferred 465 1,175 1,640 $ 3,312 $ 1,185 $ 4,497 A reconciliation of the statutory federal income tax rate to the effective income tax rate is as follows: Year Ended December 31, 2017 2016 2015 Statutory federal income tax rate 35.0 % 34.0 % 34.0 % State franchise tax, net of federal income tax benefit 6.2 6.9 6.9 Tax Cuts and Jobs Act impact on deferred re-measurement 6.3 0.0 0.0 Other (2.6 ) (1.2 ) (1.1 ) 44.9 % 39.7 % 39.8 % At December 31, 2017 , the Company has no remaining federal and state net operating loss carry-forwards. The Company periodically reviews its tax positions under the accounting standards related to uncertainty in income taxes, which defines the criteria that an individual tax position would have to meet for some or all of the income tax benefit to be recognized in a taxable entity’s financial statements. Under the guidelines, an entity should recognize the financial statement benefit of a tax position if it determines that it is more likely than not that the position will be sustained on examination. The term, “more likely than not”, means a likelihood of more than 50 percent. In assessing whether the more-likely-than-not criterion is met, the entity should assume that the tax position will be reviewed by the applicable taxing authority and all available information is known to the taxing authority. The Company's 2017 results include the impact of the enactment of the Tax Cuts and Jobs Act, which was signed into law on December 22, 2017. The law includes significant changes to the U.S. corporate tax system, including a Federal corporate rate change reduction from 34% to 21% . In 2017, the Company applies this newly enacted corporate federal income tax of 21% , resulting in approximately a $986,000 increase to tax expense. The final impact of the tax rate change may differ due to changes in assumptions made by the Company or actions the Company may take as a result of tax reform. The Company and its subsidiary file income tax returns in the U.S federal jurisdiction, and several states within the U.S. There are no filings in foreign jurisdictions. During 2014, the Company began the process to amend its state tax returns for the years 2009 through 2012 to file a combined report on a unitary basis with the Company and USB Investment Trust . The amended return for 2009 was filed during 2014, the 2010 return was filed during 2015, and the amended returns for 2011 and 2012 were filed in 2016. The Company is no longer subject to examination for years before 2013. During the third quarter of 2016, the IRS notified the Company it would be conducting an examination of the Company's 2014 federal return, to which the Company received notification that no changes were being recommended.. The Company's policy is to recognize interest and penalties related to taxes in income tax expense. Interest and penalties recognized during the years ended December 31, 2017 and 2016 were insignificant.

Stock Based Compensation

Stock Based Compensation	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Based Compensation	Stock Based Compensation Options and restricted stock units and awards have been granted to officers and key employees at an exercise price equal to estimated fair value at the date of grant as determined by the Board of Directors. All options, units, and awards granted are service awards, and as such are based solely upon fulfilling a requisite service period (the vesting period). On December 31, 2017, the Company had two stock based compensation plans. In May 2005, the Company adopted the United Security Bancshares 2005 Stock Option Plan (2005 Plan) for which 34,601 shares remain reserved for issuance for options already granted to employees and directors under incentive and nonstatutory agreements. The 2005 plan expired in May 2015. While outstanding arrangements to issue shares under this plan, including options, continue in force until their expiration, no new options will be granted under this plan. In May 2015, the Company adopted the United Security Bancshares 2015 Equity Incentive Award Plan (2015 Plan). The 2015 Plan provides for the granting of up to 758,000 shares of authorized and unissued shares of common stock in the form of stock options, restricted stock units, and restricted stock awards. The 2015 Plan requires that the exercise price may not be less than the fair value of the stock at the date the option is granted, and that the option price must be paid in full at the time it is exercised. The options granted (incentive stock options for employees and non-qualified stock options for Directors) have an exercise price at the prevailing market price on the date of grant. All options granted are exercisable 20% each year commencing one year after the date of grant and expire ten years after the date of grant. Restricted stock awards are granted at the prevailing market price of the Company's stock and typically vest over a five-year period. Restricted stock awards are subject to forfeiture if employment terminates prior to vesting. The cost of these awards is recognized over the vesting period of the awards based on the fair value of our common stock on the date of the grant. Under the 2005 Plan, 34,601 granted options are outstanding ( 34,601 incentive stock options and 0 nonqualified stock options) as of December 31, 2017 , of which 26,565 are vested. No options were granted under this plan during the year ended December 31, 2017 . Under the 2015 Plan, 106,511 granted shares are outstanding as of December 31, 2017 , of which none are exercisable. 46,511 outstanding granted shares under the 2015 Plan are restricted stock units. A summary of the status of the Company's stock option plan and changes during the year are presented below: Shares (a) Weighted Average Exercise Price Options outstanding December 31, 2016 (a) 37,115 $ 3.83 Granted during the year 60,000 10.15 Exercised during the year 2,514 2.55 Forfeited during the year — — Options outstanding December 31, 2017 94,601 $ 7.87 (a) Options have been adjusted for stock dividends A summary of the status of the Company's restricted stock and changes during the year are presented below: Shares (a) Weighted Average Grant-Date Fair Value Non-vested units at December 31, 2016 (b) 12,015 $ 5.13 Granted during the year 41,917 10.92 Vested during the year 7,421 7.24 Canceled during the year — — Non-vested units at December 31, 2017 46,511 $ 9.57 (b) Shares have been adjusted for stock dividends Included in total outstanding options at December 31, 2017 , are 26,565 exercisable shares at a weighted average price of $3.87 , a weighted average remaining contract term of 5.7 years and intrinsic value of $189,000 . Included in salaries and employee benefits for the years ended December 31, 2017, 2016, and 2015 , is $97,000 , $30,000 , and $26,000 of share-based compensation, respectively. The related tax benefit on share-based compensation recorded in the provision for income taxes was not material to either year. As of December 31, 2017, 2016, and 2015 , there was $418,000 , $30,000 , and $48,000 , respectively, of total unrecognized compensation expense related to non­vested stock options. This cost is expected to be recognized over a weighted average period of approximately 4.6 years. 2,513 options were exercised during 2016 , while 2,514 options were exercised during 2017 . December 31, 2017 December 31, 2016 December 31, 2015 Weighted average grant-date fair value per share of stock options granted $ 7.18 $ — $ — Total fair value of stock options vested $ 17,845 $ 19,650 $ 19,640 Total intrinsic value of stock options exercised $ 12,383 $ 4,500 $ — For the year ended December 31, 2017 , the Company granted 41,917 shares of restricted stock. As of December 31, 2017, 2016, and 2015 , there was $439,000 , $35,000 , and $44,000 , respectively, of total unrecognized compensation expense related to restricted stock. This cost is expected to be recognized over a weighted-average period of approximately 1.1 years. The Bank determines fair value of stock options at grant date using the Black-Scholes-Merton 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 and the expected dividend yield and the risk-free interest rate over the expected life of the option. The Bank determines fair value of restricted stock based on the quoted stock price as of the grant date. The weighted average assumptions used in the pricing model are noted in the table below. The expected term of options granted is derived from management's experience, which is based upon historical data on employee exercise and post-vesting behavior. The risk free rate for periods within the contractual 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 Bank's stock over a period commensurate with the expected term of the options. The Company believes that historical volatility is indicative of expectations about its future volatility over the expected term of the options. The Bank expenses the fair value of the option on a straight-line basis over the vesting period for each separately vesting portion of the award. The Bank estimates forfeitures and only recognizes expense for those shares expected to vest. Based upon historical evidence, the Company has determined that because options are granted to a limited number of key employees rather than a broad segment of the employee base, expected forfeitures, if any, are not material. The Company granted 41,917 restricted stock units and 60,000 options during 2017 . The Company did not grant any restricted stock units or options in 2016, while the Company granted 14,290 shares in restricted stock units and no stock options during 2015. The assumptions used for the 2017 , 2016 , and 2015 awards are as follows: Year Ended Year Ended Year Ended December 31, 2017 December 31, 2016 December 31, 2015 Risk Free Interest Rate 1.94% —% —% Expected Dividend Yield —% —% —% Expected Life in Years 10 years 0 years 0 years Expected Price Volatility 62.60% —% —% The Black-Scholes-Merton option valuation model requires the input of highly subjective assumptions, including the expected life of the stock based award and stock price volatility. The assumptions listed above represent management's best estimates, but these estimates involve inherent uncertainties and the application of management judgment. As a result, if other assumptions had been used, the Bank's recorded stock-based compensation expense could have been materially different from that previously reported in proforma disclosures. In addition, the Bank is required to estimate the expected forfeiture rate and only recognize expense for those shares expected to vest. If the Bank's actual forfeiture rate is materially different from the estimate, the share-based compensation expense could be materially different.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2017
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans 401K Plan The Company has a Cash or Deferred 401(k) Stock Ownership Plan (the “401(k) Plan”) organized under Section 401(k) of the Code. All employees of the Company are initially eligible to participate in the 401(k) Plan upon the first day of the month after date of hire. Under the terms of the plan, the participants may elect to make contributions to the 401(k) Plan as determined by the Board of Directors. Participants are automatically vested 100% in all employee contributions. Participants may direct the investment of their contributions to the 401(k) Plan in any of several authorized investment vehicles. The Company contributes funds to the Plan up to 4% of the employees’ eligible annual compensation. Company contributions are immediately 100% vested at the time of contribution. The Company made matching contributions of $255,000 , $280,000 , and $240,000 to the 401(k) Plan for the years ended December 31, 2017, 2016, and 2015 , respectively. Salary Continuation Plan The Company has an unfunded, non-qualified Salary Continuation Plan for senior executive officers and certain other key officers of the Company, which provides additional compensation benefits upon retirement for a period of at least 15 years. Future compensation under the Plan is earned by the employees for services rendered through retirement and vests over a period of 12 to 32 years. In 2015, the Company entered into Salary Continuation agreements with three officers of the Bank. The Company purchased company owned life insurance (COLI) policies on the life of the officers in connection with the Salary Continuation agreements. Life insurance premium expense totaled $49,000 for the insurance policies purchased. The Company accrues for the salary continuation liability based on anticipated years of service and vesting schedules provided under the Plan. The Company’s current benefit liability is determined based upon vesting and the present value of the benefits at a corresponding discount rate. The discount rate used is an equivalent rate for high-quality investment-grade bonds with lives matching those of the service periods remaining for the salary continuation contracts, which averages approximately 20 years. At December 31, 2017 and 2016 , $4,084,000 and $3,975,000 , respectively, had been accrued to date, based on a discounted cash flow using an average discount rate of 3.04% and 3.21% , respectively, and is included in other liabilities. In connection with the implementation of the Salary Continuation Plans, the Company purchased single premium universal life insurance policies on the life of each of the key employees covered under the Plan. The Company is the owner and beneficiary of these insurance policies. The cash surrender value of the policies was $6,817,000 and $6,452,000 at December 31, 2017 and 2016 , respectively, and is included on the consolidated balance sheet in cash surrender value of life insurance. Income on these policies, net of expense, totaled approximately $485,000 , $465,000 , and $399,000 for the years ended December 31, 2017, 2016, and 2015 , respectively. Although the Plan is unfunded, the Company intends to utilize the proceeds of such policies to settle the Plan obligations. Under Internal Revenue Service regulations, the life insurance policies are the property of the Company and are available to satisfy the Company's general creditors . Pursuant to the guidance contained in ASC Topic 715 “ Compensation, ” the Company is required to recognize in accumulated other comprehensive (loss) income, the amounts that have not yet been recognized as components of net periodic benefit costs. These unrecognized costs arise from changes in estimated interest rates used in the calculation of net liabilities under the Plan. As of December 31, 2017, 2016, and 2015 , the Company had approximately $462,000 , $383,000 , and $371,000 , respectively in unrecognized net periodic benefit costs arising from changes in interest rates used in calculating the current post-retirement liability required under the Plan. This amount represents the difference between the plan liabilities calculated under net present value calculations, and the net plan liabilities actually recorded on the Company’s books at December 31, 2017 and 2016 . Salary continuation expense is included in salaries and benefits expense, and totaled $223,000 , $137,000 , and $193,000 for the years ended December 31, 2017, 2016, and 2015 , respectively. Officer Supplemental Life Insurance Plan The Company owns single premium Bank-owned life insurance policies (BOLI) and Company owned life insurance policies (COLI) on certain officers with a portion of the death benefits available to the officers’ beneficiaries. The BOLI and COLI initial net cash surrender value is equivalent to the premium paid, and it adds income through non-taxable increases in its cash surrender value, net of the cost of insurance, plus any death benefits ultimately received by the Company. The cash surrender value of these insurance policies totaled $12,935,000 and $12,595,000 at December 31, 2017 and 2016 , and is included on the consolidated balance sheet in cash surrender value of life insurance. These policies resulted in a income, net of expense, of approximately $485,000 , $465,000 , and $399,000 for the years ended December 31, 2017, 2016, and 2015 , respectively.

Commitments and Contingent Liab

Commitments and Contingent Liabilities	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	Commitments and Contingent Liabilities Lease Commitments : The Company leases land and premises for its branch banking offices and administration facilities. The initial terms of these leases expire at various dates through 2025. Under the provisions of most of these leases, the Company has the option to extend the leases beyond their original terms at rental rates adjusted for changes reported in certain economic indices or as reflected by market conditions. The total expense on land and premises leased under operating leases was $922,000 , $862,000 , and $782,000 for the years ended December 31, 2017, 2016, and 2015 , respectively. Total rent expense for the years ended December 31, 2017, 2016, and 2015 included approximately $1,000 , $8,000 , and $16,000 in reductions, respectively, related to adjustments made pursuant to ASC Topic 840, “ Leases." The adjustments represent the difference between contractual rent amounts paid and rent amounts actually expensed under the straight-line method pursuant to ASC 840. Future minimum rental commitments under existing non-cancelable leases as of December 31, 2017 are as follows: (In thousands): 2018 $ 710 2019 534 2020 484 2021 288 2022 282 Thereafter 806 $ 3,104 Financial Instruments with Off-Balance Sheet Risk: The Company is party to financial instruments with off-balance sheet risk which arise in the normal course of business. These instruments may contain elements of credit risk, interest rate risk and liquidity risk, and include commitments to extend credit and standby letters of credit. The credit risk associated with these instruments is essentially the same as that involved in extending credit to customers and is represented by the contractual amount indicated in the table below: Contractual amount – December 31, (In thousands) 2017 2016 Commitments to extend credit $ 99,958 $ 120,485 Standby letters of credit 2,058 1,201 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. Substantially all of these commitments are at floating interest rates based on the Prime rate, and most have fixed expiration dates. The Company evaluates each customer's creditworthiness on a case-by-case basis, and the amount of collateral obtained, if deemed necessary, is based on management's credit evaluation. Collateral held varies but includes accounts receivable, inventory, leases, property, plant and equipment, residential real estate and income-producing properties. Many of the commitments are expected to expire without being drawn upon and, as a result, the total commitment amounts do not necessarily represent future cash requirements of the Company. Standby letters of credit are generally unsecured and are issued by the Company to guarantee the performance of a customer to a third party. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loans to customers. The Company’s letters of credit are short-term guarantees and generally have terms from less than one month to approximately 3 years. At December 31, 2017 , the maximum potential amount of future undiscounted payments the Company could be required to make under outstanding standby letters of credit totaled $2,058,000 . In the ordinary course of business, the Company becomes involved in litigation arising out of its normal business activities. Management, after consultation with legal counsel, believes that the ultimate liability, if any, resulting from the disposition of such claims would not be material to the financial position of the Company.

Fair Value Measurements and Dis

Fair Value Measurements and Disclosure	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements and Disclosure	Fair Value Measurements and Disclosure The following summary disclosures are made in accordance with the guidance provided by ASC Topic 825 “ Fair Value Measurements and Disclosures ” (formerly Statement of Financial Accounting Standards No. 107, “Disclosures about Fair Value of Financial Instruments,”) which requires the disclosure of fair value information about both on- and off-balance sheet financial instruments where it is practicable to estimate that value. Generally accepted accounting guidance clarifies the definition of fair value, describes methods used to appropriately measure fair value in accordance with generally accepted accounting principles and expands fair value disclosure requirements. This guidance applies whenever other accounting pronouncements require or permit fair value measurements. The fair value hierarchy prioritizes the inputs to valuation techniques used to measure fair value into three broad levels (Level 1, Level 2, and Level 3). Level 1 inputs are unadjusted quoted prices in active markets (as defined) for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level 2 inputs are inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly. Level 3 inputs are unobservable inputs for the asset or liability, and reflect the reporting entity’s own assumptions about the assumptions that market participants would use in pricing the asset or liability (including assumptions about risk). The table below is a summary of fair value estimates for financial instruments and the level of the fair value hierarchy within which the fair value measurements are categorized at the periods indicated: December 31, 2017 (In thousands) Carrying Amount Estimated Fair Value Quoted Prices In Active Markets for Identical Assets Level 1 Significant Other Observable Inputs Level 2 Significant Unobservable Inputs Level 3 Financial Assets: Cash and cash equivalents $ 107,934 $ 107,934 $ 107,934 $ — $ — Investment securities 45,722 45,722 3,737 41,985 — Loans 593,123 588,938 — — 588,938 Accrued interest receivable 6,526 6,526 — 6,526 — Financial Liabilities: Deposits: Noninterest-bearing 307,299 307,299 307,299 — — NOW and money market 234,154 234,154 234,154 — — Savings 81,408 81,408 81,408 — — Time deposits 64,832 64,387 — — 64,387 Total deposits 687,693 687,248 622,861 — 64,387 Junior subordinated debt 9,730 9,730 — — 9,730 Accrued interest payable 44 44 — 44 — December 31, 2016 (In thousands) Carrying Amount Estimated Fair Value Quoted Prices In Active Markets for Identical Assets Level 1 Significant Other Observable Inputs Level 2 Significant Unobservable Inputs Level 3 Financial Assets: Cash and cash equivalents $ 113,032 $ 113,032 $ 113,032 $ — $ — Interest-bearing deposits 650 650 — 650 — Investment securities 57,491 57,491 3,716 53,775 — Loans 561,932 557,914 — — 557,914 Accrued interest receivable 3,895 3,895 — 3,895 — Financial Liabilities: Deposits: Noninterest-bearing 262,697 262,697 262,697 — — NOW and money market 235,873 235,873 235,873 — — Savings 75,068 75,068 75,068 — — Time deposits 102,991 102,743 — — 102,743 Total deposits 676,629 676,381 573,638 — 102,743 Junior subordinated debt 8,832 8,832 — — 8,832 Accrued interest payable 76 76 — 76 — The Company performs fair value measurements on certain assets and liabilities as the result of the application of current accounting guidelines. Some fair value measurements, such as available-for-sale securities (AFS) and junior subordinated debt are performed on a recurring basis, while others, such as collateral dependent impaired loans, other real estate owned, goodwill and other intangibles, are performed on a nonrecurring basis. The Company’s Level 1 financial assets consist of money market funds and highly liquid mutual funds for which fair values are based on quoted market prices. The Company’s Level 2 financial assets include highly liquid debt instruments of U.S. government agencies, collateralized mortgage obligations, and debt obligations of states and political subdivisions, whose fair values are obtained from readily-available pricing sources for the identical or similar underlying security that may, or may not, be actively traded. The Company’s Level 3 financial assets include certain impaired loans, other real estate owned, goodwill, and intangible assets where the assumptions may be made by us or third parties about assumptions that market participants would use in pricing the asset or liability. From time to time, the Company recognizes transfers between Level 1, 2, and 3 when a change in circumstances warrants a transfer. There were no transfers in or out of Level 1 and Level 2 fair value measurements during the year ended December 31, 2017 . The following tables summarize the Company’s assets and liabilities that were measured at fair value on a recurring and non-recurring basis as of December 31, 2017 (in 000’s): Description of Assets December 31, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) AFS Securities (2): U.S. Government agencies $ 19,954 $ — $ 19,954 $ — U.S Govt collateralized mortgage obligations 22,031 — 22,031 — Mutual Funds 3,737 3,737 — — Total AFS securities 45,722 3,737 41,985 — Impaired Loans (1): Commercial and industrial — — — — Real estate mortgage — — — — RE construction & development — — — — Agricultural — — — — Installment/Other — — — — Total impaired loans — — — — Other real estate owned (1) — — — — Total $ 45,722 $ 3,737 $ 41,985 $ — Description of Liabilities December 31, 2017 Quoted Prices (Level 1) Significant (Level 2) Significant (Level 3) Junior subordinated debt (2) $ 9,730 $ — $ — $ 9,730 Total $ 9,730 $ — $ — $ 9,730 (1) Nonrecurring (2) Recurring The following tables summarize the Company’s assets and liabilities that were measured at fair value on a recurring and non-recurring basis as of December 31, 2016 (in 000’s): Description of Assets December 31, 2016 Quoted Prices (Level 1) Significant (Level 2) Significant (Level 3) AFS Securities (2): U.S. Government agencies $ 23,203 $ — $ 23,203 $ — U.S Govt collateralized mortgage obligations 30,572 — 30,572 — Mutual Funds 3,716 3,716 — — Total AFS securities 57,491 3,716 53,775 — Impaired Loans (1): Commercial and industrial 301 — — 301 Real estate mortgage — — — — RE construction & development — — — — Agricultural — — — — Installment/Other — — — — Total impaired loans 301 — — 301 Other real estate owned (1) — — — — Total $ 57,792 $ 3,716 $ 53,775 $ 301 Description of Liabilities December 31, 2016 Quoted Prices (Level 1) Significant (Level 2) Significant (Level 3) Junior subordinated debt (2) $ 8,832 $ — $ — $ 8,832 Total $ 8,832 $ — $ — $ 8,832 (1) Nonrecurring (2) Recurring The Company did not record a write-down on other real estate owned during the years ended December 31, 2017 and 2016 . A write-down of $188,000 was recorded during the year ended December 31, 2015 . The following table presents quantitative information about Level 3 fair value measurements for the Company's assets measured at fair value on a non-recurring basis at December 31, 2016 (in 000's). There were no assets measured at fair value on a non-recurring basis at December 31, 2017 . December 31, 2016 Financial Instrument Fair Value Valuation Technique Unobservable Input Range, Weighted Average Impaired Loans: Commercial and industrial $301 Sales Comparison Approach Adjustment for difference between comparable sales 7%-29%, 19.1% The following methods and assumptions were used in estimating the fair values of financial instruments: Cash and Cash Equivalents - The carrying amounts reported in the balance sheets for cash and cash equivalents approximate their estimated fair values. Interest-bearing Deposits – Interest bearing deposits in other banks consist of fixed-rate certificates of deposits. Accordingly, fair value has been estimated based upon interest rates currently being offered on deposits with similar characteristics and maturities. Investments – Available for sale securities are valued based upon open-market price quotes obtained from reputable third-party brokers that actively make a market in those securities. Market pricing is based upon specific CUSIP identification for each individual security. To the extent there are observable prices in the market, the mid-point of the bid/ask price is used to determine fair value of individual securities. If that data is not available for the last 30 days, a Level 2-type matrix pricing approach based on comparable securities in the market is utilized. Level-2 pricing may include using a forward spread from the last observable trade or may use a proxy bond like a TBA mortgage to come up with a price for the security being valued. Changes in fair market value are recorded through other comprehensive loss as the securities are available for sale. Loans - Fair values of variable rate loans, which reprice frequently and with no significant change in credit risk, are based on carrying values adjusted for credit risk. Fair values for all other loans, except impaired loans, are estimated using discounted cash flows over their remaining maturities, using interest rates at which similar loans would currently be offered to borrowers with similar credit ratings and for the same remaining maturities. The allowance for loan loss is considered to be a reasonable estimate of loan discount for credit quality concerns. Impaired Loans - Fair value measurements for collateral dependent impaired loans are performed pursuant to authoritative accounting guidance and are based upon either collateral values supported by appraisals and observed market prices. Collateral dependent loans are measured for impairment using the fair value of the collateral. Changes are recorded directly as an adjustment to current earnings. Other Real Estate Owned - Nonrecurring adjustments to certain commercial and residential real estate properties classified as other real estate owned (OREO) are measured at the lower of carrying amount or fair value, less costs to sell. Fair values are generally based on third party appraisals of the property, resulting in a Level 3 classification. In cases where the carrying amount exceeds the fair value, less costs to sell, an impairment loss is recognized. Deposits – In accordance with authoritative accounting guidance, fair values for transaction and savings accounts are equal to the respective amounts payable on demand at December 31, 2017 and 2016 (i.e. carrying amounts). The Company believes that the fair value of these deposits is clearly greater than that prescribed under authoritative accounting guidance. Fair values of fixed-maturity certificates of deposit were estimated using the rates currently offered for deposits with similar remaining maturities. Junior Subordinated Debt – The fair value of the junior subordinated debt was determined based upon a discounted cash flows model utilizing observable market rates and credit characteristics for similar debt instruments. In its analysis, the Company used characteristics that market participants generally use, and considered factors specific to (a) the liability, (b) the principal (or most advantageous) market for the liability, and (c) market participants with whom the reporting entity would transact in that market. For the year ended December 31, 2017 , cash flows were discounted at a rate which incorporates a current market rate for similar-term debt instruments, adjusted for credit and liquidity risks associated with similar junior subordinated debt and circumstances unique to the Company. The Company believes that the subjective nature of theses inputs, due primarily to the current economic environment, require the junior subordinated debt to be classified as a Level 3 fair value. Accrued Interest Receivable and Payable - The carrying value of these instruments is a reasonable estimate of fair value. Off-balance sheet Instruments - Off-balance sheet instruments consist of commitments to extend credit, standby letters of credit and derivative contracts. The contract amounts of commitments to extend credit and standby letters of credit are disclosed in Note 12. Fair values of commitments to extend credit are estimated using the interest rate currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the present counterparties’ credit standing. There was no material difference between the contractual amount and the estimated value of commitments to extend credit at December 31, 2017 and 2016 . Fair values of standby letters of credit are based on fees currently charged for similar agreements. The fair value of commitments generally approximates the fees received from the customer for issuing such commitments. These fees are not material to the Company’s consolidated balance sheet and results of operations. The following tables provide a reconciliation of liabilities at fair value using significant unobservable inputs (Level 3) on a recurring basis during the period (in 000’s): December 31, 2017 December 31, 2016 December 31, 2015 Reconciliation of Liabilities: Junior Subordinated Debt Junior Subordinated Debt Junior Subordinated Debt Beginning balance $ 8,832 $ 8,300 $ 10,115 Total losses included in earnings 882 518 73 Canceled debt — — (1,122 ) Gain on redemption of liability — — 78 Capitalized interest 16 1,050 (698 ) Ending balance $ 9,730 $ 8,832 $ 8,300 The amount of total losses for the period included in earnings attributable to the change in unrealized gains or losses relating to liabilities still held at the reporting date $ 882 $ 518 $ 73 The following table provides a description of the valuation technique, unobservable input, and qualitative information about the unobservable inputs for the Company’s liabilities classified as Level 3 and measured at fair value on a recurring basis at December 31, 2017 and 2016 : December 31, 2017 December 31, 2016 Financial Instrument Valuation Technique Unobservable Input Weighted Average Financial Instrument Valuation Technique Unobservable Input Weighted Average Subordinated Debt Discounted cash flow Discount Rate 5.81% Subordinated Debt Discounted cash flow Discount Rate 6.46% Management believes that the credit risk adjusted spread utilized in the fair value measurement of the junior subordinated debentures carried at fair value is indicative of the nonperformance risk premium a willing market participant would require under current market conditions, that is, the inactive market. Management attributes the change in fair value of the junior subordinated debentures during the period to market changes in the nonperformance expectations and pricing of this type of debt, and not as a result of changes to our entity-specific credit risk. The narrowing of the credit risk adjusted spread above the Company’s contractual spreads has primarily contributed to the negative fair value adjustments. Generally, an increase in the credit risk adjusted spread and/or a decrease in the three month LIBOR swap curve will result in positive fair value adjustments (and decrease the fair value measurement). Conversely, a decrease in the credit risk adjusted spread and/or an increase in the three month LIBOR swap curve will result in negative fair value adjustments (and increase the fair value measurement).

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2017
Banking and Thrift [Abstract]
Regulatory Matters	Regulatory Matters Capital Adequacy - The Company (on a consolidated basis) and the Bank are subject to various regulatory capital requirements adopted by the Board of Governors of the Federal Reserve System (the “Board of Governors”). Failure to meet minimum capital requirements can initiate certain mandates and possible additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s consolidated financial statements and results of operations. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the consolidated Company and the Bank must meet specific capital guidelines that involve quantitative measures of their assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors. Prompt corrective action provisions are not applicable to bank holding companies. Quantitative measures established by the capital adequacy guidelines require insured institutions to maintain a minimum leverage ratio of Tier 1 capital (the sum of common stockholders' equity, noncumulative perpetual preferred stock and minority interests in consolidated subsidiaries, minus intangible assets, identified losses and investments in certain subsidiaries, plus unrealized losses or minus unrealized gains on available for sale securities) to total assets. Institutions which have received the highest composite regulatory rating and which are not experiencing or anticipating significant growth are required to maintain a minimum leverage capital ratio of 3% of Tier 1 capital to total assets. All other institutions are required to maintain a minimum leverage capital ratio of at least 100 to 200 basis points above the 3% minimum requirement. The Company has adopted a capital plan that includes guidelines and trigger points to ensure sufficient capital is maintained at the Bank and the Company, and that capital ratios are maintained at a level deemed appropriate under regulatory guidelines given the level of classified assets, concentrations of credit, ALLL, current and projected growth, and projected retained earnings. The capital plan also contains contingency strategies to obtain additional capital as required to fulfill future capital requirements for both the Bank, as a separate legal entity, and the Company on a consolidated basis. The following table shows the Company’s and the Bank’s regulatory capital and regulatory capital ratios at December 31, 2017 and 2016 , as compared to the applicable capital adequacy guidelines: To Be Well Capitalized Under Actual For Capital Adequacy Purposes Prompt Corrective Action Provisions (In thousands) Amount Ratio Amount Ratio Amount Ratio As of December 31, 2017 (Company): Total Capital (to Risk Weighted Assets) $ 115,265 17.54 % $ 52,560 8.00 % N/A N/A Tier 1 Capital (to Risk Weighted Assets) 107,043 16.29 % 39,420 6.00 % N/A N/A Common Equity Tier 1 (to Risk Weighted Assets) 97,313 14.81 % 29,565 4.50 % N/A N/A Tier 1 Leverage (to Average Assets) 107,043 13.01 % 32,899 4.00 % N/A N/A As of December 31, 2017 (Bank): Total Capital (to Risk Weighted Assets) $ 113,653 17.31 % $ 52,511 8.00 % $ 65,638 10.00 % Tier 1 Capital (to Risk Weighted Assets) 105,431 16.06 % 39,383 6.00 % 52,511 8.00 % Common Equity Tier 1 (to Risk Weighted Assets) 105,431 16.06 % 29,537 4.50 % 42,665 6.50 % Tier 1 Leverage (to Average Assets) 105,431 12.90 % 32,732 4.00 % 40,865 5.00 % As of December 31, 2016 (Company): Total Capital (to Risk Weighted Assets) $ 108,868 17.26 % $ 50,454 8.00 % N/A N/A Tier 1 Capital (to Risk Weighted Assets) 100,968 16.01 % 37,840 6.00 % N/A N/A Common Equity Tier 1 (to Risk Weighted Assets) 92,600 14.68 % 30,630 4.50 % N/A N/A Tier 1 Leverage (to Average Assets) 100,968 12.97 % 30,956 4.00 % N/A N/A As of December 31, 2016 (Bank): Total Capital (to Risk Weighted Assets) $ 108,400 17.19 % $ 50,454 8.00 % $ 63,068 10.00 % Tier 1 Capital (to Risk Weighted Assets) 100,500 15.94 % 37,840 6.00 % 50,454 8.00 % Common Equity Tier 1 (to Risk Weighted Assets) 100,500 15.94 % 30,630 4.50 % 40,994 6.50 % Tier 1 Leverage (to Average Assets) 100,500 12.99 % 30,956 4.00 % 38,695 5.00 % As of December 31, 2015 (Company): Total Capital (to Risk Weighted Assets) $ 100,659 16.65 % $ 48,358 8.00 % N/A N/A Tier 1 Capital (to Risk Weighted Assets) 93,073 15.40 % 36,269 6.00 % N/A N/A Common Equity Tier 1 (to Risk Weighted Assets) 85,237 14.10 % 27,201 4.50 % N/A N/A Tier 1 Leverage (to Average Assets) 93,073 12.95 % 28,747 4.00 % N/A N/A As of December 31, 2015 (Bank): Total Capital (to Risk Weighted Assets) $ 100,544 16.69 % $ 48,204 8.00 % $ 71,870 10.00 % Tier 1 Capital (to Risk Weighted Assets) 92,981 15.43 % 36,153 6.00 % 57,496 8.00 % Common Equity Tier 1 (to Risk Weighted Assets) 92,981 15.43 % 27,115 4.50 % 46,716 6.50 % Tier 1 Leverage (to Average Assets) 92,981 12.94 % 28,748 4.00 % 35,935 5.00 % Federal regulations require FDIC-insured depository institutions, including the Bank, to meet several minimum capital standards: a common equity Tier 1 capital to risk-based assets ratio; a Tier 1 capital to risk-based assets ratio; a total capital to risk-based assets; and a Tier 1 capital to total assets leverage ratio. The existing capital requirements were effective January 1, 2015 and are the result of a final rule implementing regulatory amendments based on recommendations of the Basel Committee on Banking Supervision and certain requirements of the Dodd-Frank Act. The capital standards require the maintenance of common equity Tier 1 capital, Tier 1 capital and Total capital to risk-weighted assets of at least 4.5% , 6% and 8% , respectively. The regulations also establish a minimum required leverage ratio of at least 4% Tier 1 capital. Common equity Tier 1 capital is generally defined as common stockholders' equity and retained earnings. Tier 1 capital is generally defined as common equity Tier 1 and Additional Tier 1 capital. Additional Tier 1 capital generally includes certain noncumulative perpetual preferred stock and related surplus and minority interests in equity accounts of consolidated subsidiaries. Total capital includes Tier 1 capital (common equity Tier 1 capital plus Additional Tier 1 capital) and Tier 2 capital. Tier 2 capital is comprised of capital instruments and related surplus meeting specified requirements, and may include cumulative preferred stock and long-term perpetual preferred stock, mandatory convertible securities, intermediate preferred stock and subordinated debt. Also included in Tier 2 capital is the allowance for loan and lease losses limited to a maximum of 1.25% of risk-weighted assets and, for institutions that have exercised an opt-out election regarding the treatment of Accumulated Other Comprehensive Income ("AOCI"), up to 45% of net unrealized gains on available-for-sale equity securities with readily determinable fair market values. Institutions that have not exercised the AOCI opt-out have AOCI incorporated into common equity Tier 1 capital (including unrealized gains and losses on available-for-sale-securities). Calculation of all types of regulatory capital is subject to deductions and adjustments specified in the regulations. In determining the amount of risk-weighted assets for purposes of calculating risk-based capital ratios, an institution's assets, including certain off-balance sheet assets (e.g., recourse obligations, direct credit substitutes, residual interests), are multiplied by a risk weight factor assigned by the regulations based on the risk deemed inherent in the type of asset. Higher levels of capital are required for asset categories believed to present greater risk. For example, a risk weight of 0% is assigned to cash and U.S. government securities, a risk weight of 50% is generally assigned to prudently underwritten first lien one to four-family residential mortgages, a risk weight of 100% is assigned to commercial and consumer loans, a risk weight of 150% is assigned to certain past due loans and a risk weight of between 0% to 600% is assigned to permissible equity interests, depending on certain specified factors. In addition to establishing the minimum regulatory capital requirements, the regulations limit capital distributions and certain discretionary bonus payments to management if the institution does not hold a "capital conservation buffer" consisting of 2.5% of common equity Tier 1 capital to risk-weighted assets above the amount necessary to meet its minimum risk-based capital requirements. The capital conservation buffer requirement is being phased in beginning January 1, 2016 at 0.625% of risk-weighted assets and increasing each year until fully implemented at 2.5% on January 1, 2019. Institutions that do not maintain the required capital buffer will become subject to progressively most stringent limitations on the percentage of earnings that can be paid out in dividends or used for stock repurchases and on the payment of discretionary bonuses to executive management. Under regulatory guidelines, the $15 million in Trust Preferred Securities issued by USB Capital Trust II in July of 2007 qualifies as Tier 1 capital up to 25% of Tier 1 capital. Any additional portion of Trust Preferred Securities qualifies as Tier 2 capital. During 2015, a redemption of $3.0 million junior subordinated debt took place. The current balance of Trust Preferred Securities is $12 million . As of December 31, 2017 , the Company and the Bank meets all capital adequacy requirements to which they are subject. Dividends – Cash dividends, if any, paid to shareholders are paid by the Company, subject to restrictions set forth in the California Corporations Code and the terms of the Federal Reserve informal supervisory agreement. Dividends paid by the Company during 2017 were in the form of stock and cash dividends. In 2016 dividends were in the form of stock rather than cash dividends. The primary source of funds with which cash dividends are paid to shareholders comes from cash dividends received by the Company from the Bank. The Bank’s ability to pay dividends is subject to the restrictions set forth in the California Financial Code. Under the Financial Code, the Bank may not pay cash dividends in an amount which exceeds the lesser of the retained earnings of the Bank or the Bank’s net income for the last three fiscal years (less the amount of distributions to shareholders during that period of time). If the above test is not met, cash dividends may only be paid with the prior approval of the DBO, in an amount not exceeding the greater of: (i) the Bank’s retained earnings; (ii) its net income for the last fiscal year; or (iii) its net income for the current fiscal year. During the year ended December 31, 2017 , the Bank’s cash dividends of $ 4,291,000 paid to the Company were approved by the Federal Reserve and the DBO and funded the Company’s operating costs and payments of interest on its junior subordinated debentures. The approval by the Federal Reserve and the DBO was required for the dividend issued during the first quarter 2017, but subsequently deemed unnecessary alongside the termination of the informal agreements. During the year ended December 31, 2015, a redemption of $3.0 million junior subordinated debt was approved by both agencies. Cash Restrictions - The Bank is required to maintain average reserve balances with the Federal Reserve. During 2005, the Company implemented a deposit reclassification program, which allows the Company to reclassify a portion of transaction accounts to non-transaction accounts for reserve purposes. The deposit reclassification program is provided by a third-party vendor, and has been approved by the Federal Reserve Bank.

Supplemental Cash Flow Disclosu

Supplemental Cash Flow Disclosures	12 Months Ended
	Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Disclosures	Supplemental Cash Flow Disclosures Year Ended December 31, (In thousands) 2017 2016 2015 Cash paid during the period for: Interest $ 1,762 $ 1,362 $ 1,243 Income Taxes 6,863 1,710 3,080 Noncash activities: Loans transferred to foreclosed property — — 226 OREO financed — 3,766 — Unrealized gains (losses) on securities 16 (648 ) (265 ) Unrealized (losses) gains on unrecognized post retirement costs (6 ) (22 ) 224

Dividends on Common Stock

Dividends on Common Stock	12 Months Ended
	Dec. 31, 2017
Common Stock Dividend [Abstract]
Dividends on Common Stock	Dividends on Common Stock The Company declared one-percent (1)% common stock dividends for the quarter ended March 31, 2017. All 1% stock dividends were considered “small stock dividends” resulting in a transfer between retained earnings and common stock an amount equal to the number of shares issued in the stock dividend multiplied by the stock’s closing price at the date of declaration. Other than for earnings-per-share calculations and share-based compensation disclosures, shares issued for the stock dividend have been treated prospectively for financial reporting purposes. For purposes of earnings per share calculations, the Company’s weighted average shares outstanding and potentially dilutive shares used in the computation of earnings per share have been restated after giving retroactive effect to a 1% stock dividend to shareholders for all periods presented. On April 25, 2017, the Company’s Board of Directors declared a cash dividend of $0.05 per share on the Company's common stock. The dividend was payable on May 17, 2017, to shareholders of record as of May 8, 2017. Approximately $844,000 was transfered from retained earnings to cash to allow for distribution of the dividend to shareholders. The Board of Directors also authorized the repurchase of up to $3 million of the outstanding common stock of the Company. The timing of the purchases will depend on certain factors, including but not limited to, market conditions and prices, available funds, and alternative uses of capital. The stock repurchase program may be carried out through open-market purchases, block trades, or negotiated private transactions. On June 27, 2017, the Company’s Board of Directors declared a cash dividend of $0.05 per share on the Company's common stock. The dividend was payable on July 21, 2017, to shareholders of record as of July 7, 2017. Approximately $844,000 was transfered from retained earnings to cash to allow for distribution of the dividend to shareholders. On September 26, 2017, the Company’s Board of Directors declared a cash dividend of $0.07 per share on the Company's common stock. The dividend was payable on October 19, 2017, to shareholders of record as of October 10, 2017. Approximately $1,182,000 was transfered from retained earnings to other liabilities to allow for distribution of the dividend to shareholders. On December 19, 2017, the Company's Board of Directors declared a cash dividend of $0.07 per share on the Company's common stock. The dividend was payable on January 16, 2018, to shareholders of record as of January 4, 2018. Approximately $1,182,000 was transfered from retained earnings to other liabilities to allow for distribution of the dividend to shareholders. The Company declared one-percent (1)% common stock dividends during each of the four quarters ended December 31, 2016, September 30, 2016, June 30, 2016, and March 31, 2016. All 1% stock dividends were considered “small stock dividends” resulting in a transfer between retained earnings and common stock an amount equal to the number of shares issued in the stock dividend multiplied by the stock’s closing price at the date of declaration. Other than for earnings-per-share calculations, shares issued for the stock dividend have been treated prospectively for financial reporting purposes. For purposes of earnings per share calculations, the Company’s weighted average shares outstanding and potentially dilutive shares used in the computation of earnings per share have been restated after giving retroactive effect to a 1% stock dividend to shareholders for all periods presented.

Net Income Per Share

Net Income Per Share	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Net Income Per Share	Net Income Per Share The following table provides a reconciliation of the numerator and the denominator of the basic net income per share computation with the numerator and the denominator of the diluted net income per share computation. Prior year amounts have been restated to reflect the impact of stock dividends. Year Ended December 31, (In thousands, except earnings per share data) 2017 2016 2015 Net income available to common shareholders $ 8,640 $ 7,385 $ 6,810 Weighted average shares outstanding 16,885,587 16,881,379 16,880,563 Add: dilutive effect of stock options 19,328 7,648 2,234 Weighted average shares outstanding adjusted for potential dilution 16,904,915 16,889,027 16,882,797 Basic earnings per share $ 0.51 $ 0.44 $ 0.40 Diluted earnings per share $ 0.51 $ 0.44 $ 0.40 Anti-dilutive shares excluded from earnings per share calculation 98,000 21,000 132,000 Dilutive income per share includes the effect of stock options and other potentially dilutive securities using the treasury stock method. There are two forms of 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.

Common Stock Repurchase Plan

Common Stock Repurchase Plan	12 Months Ended
	Dec. 31, 2017
Common Stock Repurchase Plan [Abstract]
Common Stock Repurchase Plan	Common Stock Repurchase Plan On May 16, 2007, the Company’s Board of Directors approved a plan to repurchase, as conditions warrant, up to 846,127 shares of the Company's common stock on the open market or in privately negotiated transactions. The repurchase plan represents approximately 5.00% of the Company's currently outstanding common stock. The duration of the program is open-ended and the timing of purchases will depend on market conditions. As of December 31, 2017 , there were 732,556 shares available for repurchase. On April 25, 2017, the Company’s Board of Directors approved the repurchase of up to $3 million of the outstanding common stock of the Company. The timing of the purchases will depend on certain factors, including but not limited to, market conditions and prices, available funds, and alternative uses of capital. The stock repurchase program may be carried out through open-market purchases, block trades, or negotiated private transactions. The Company did not repurchase any common shares during the years ended December 31, 2017, 2016, and 2015 .

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets At December 31, 2017 , the Company had goodwill in the amount of $4,488,000 in connection with various business combinations and purchases. This amount was unchanged from the balance of $4,488,000 at December 31, 2016 . While goodwill is not amortized, the Company does conduct periodic impairment analysis on goodwill at least annually or more often as conditions require. The Company performed its analysis of goodwill impairment and concluded goodwill was not impaired at December 31, 2017 .

Parent Company Only Financial S

Parent Company Only Financial Statements	12 Months Ended
	Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Parent Company Only Financial Statements	Parent Company Only Financial Statements The following are the condensed financial statements of United Security Bancshares and should be read in conjunction with the consolidated financial statements: United Security Bancshares – (parent only) Balance Sheets - December 31, 2017 and 2016 (In thousands) 2017 2016 Assets Cash and equivalents $ 1,656 $ 148 Investment in bank subsidiary 109,472 104,554 Other assets 1,136 2,525 Total assets 112,264 107,227 Liabilities & Shareholders' Equity Liabilities: Junior subordinated debt securities (at fair value) 9,730 8,832 Deferred taxes — 1,741 Dividends declared 1,182 — Total liabilities 10,912 10,573 Shareholders' Equity: Common stock, no par value 20,000,000 shares authorized, 16,885,615 and 16,705,594 issued and outstanding, at December 31, 2017 and December 31, 2016, respectively 57,880 56,557 Retained earnings 44,182 40,701 Accumulated other comprehensive loss (710 ) (604 ) Total shareholders' equity 101,352 96,654 Total liabilities and shareholders' equity $ 112,264 $ 107,227 United Security Bancshares – (parent only) Year ended December 31, Income Statements (In thousands) 2017 2016 2015 Income Loss on fair value of financial liability $ (882 ) $ (518 ) $ (73 ) Gain on redemption of JR subordinated debentures — — 78 Dividends from subsidiary 4,291 424 2,416 Total income 3,409 (94 ) 2,421 Expense Interest expense 302 240 225 Other expense 269 241 256 Total expense 571 481 481 Income (loss) before taxes and equity in undistributed income of subsidiary 2,838 (575 ) 1,940 Income tax benefit (989 ) (411 ) (196 ) Undistributed income of subsidiary 4,813 7,549 4,674 Net Income $ 8,640 $ 7,385 $ 6,810 United Security Bancshares – (parent only) Year ended December 31, Statement of Cash Flows (In thousands) 2017 2016 2015 Cash Flows From Operating Activities Net income $ 8,640 $ 7,385 $ 6,810 Adjustments to reconcile net income to cash provided by operating activities: Equity in undistributed income of subsidiary (4,813 ) (7,549 ) (4,674 ) Provision for deferred income taxes (751 ) (169 ) (518 ) Loss on fair value option of financial liability 882 518 73 Gain on redemption of junior subordinated debentures — — (78 ) Decrease (increase) in income tax receivable 391 (198 ) 117 Net change in other assets/liabilities 23 15 (14 ) Net cash provided by operating activities 4,372 2 1,716 Cash Flows From Financing Activities Proceeds from exercise of stock options 6 6 — Dividends paid (2,870 ) — — Redemption of junior subordinated debenture — — (1,800 ) Net cash (used in) provided by financing activities (2,864 ) 6 (1,800 ) Net increase (decrease) increase in cash and cash equivalents 1,508 8 (84 ) Cash and cash equivalents at beginning of year 148 140 224 Cash and cash equivalents at end of year $ 1,656 $ 148 $ 140

Summary of Quarterly Results of

Summary of Quarterly Results of Operation (unaudited)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Summary of Quarterly Results of Operation (unaudited)	The following table sets forth the results of operations for the four quarters of 2017 and 2016, and is unaudited; however, in the opinion of Management, it reflects all adjustments (which include only normal recurring adjustments) necessary to present fairly the summarized results for such periods. 2017 Quarters Ended December 31, September 30, June 30, March 31, (dollars in thousands, except per share data) Interest Income: Loans, including fees $ 8,035 $ 7,978 $ 7,579 $ 7,225 Investment securities, interest bearing cash at Banks 560 614 531 408 Total interest income 8,595 8,592 8,110 7,633 Interest Expense 451 435 438 405 Net Interest Income 8,144 8,157 7,672 7,228 Provision (recovery of provision) for Credit Losses 48 7 (52 ) 21 Net Interest Income after Provision for Credit Losses 8,096 8,150 7,724 7,207 Noninterest Income 1,155 1,176 1,066 909 Noninterest Expense 5,260 4,746 4,607 5,190 Income Before Provision for Taxes 3,991 4,580 4,183 2,926 Provision for Taxes on Income 2,354 1,840 1,691 1,155 Net Income $ 1,637 $ 2,740 $ 2,492 $ 1,771 Net Income per common share Basic $ 0.10 $ 0.16 $ 0.15 $ 0.10 Diluted $ 0.10 $ 0.16 $ 0.15 $ 0.10 2016 Quarters Ended December 31, September 30, June 30, March 31, (dollars in thousands, except per share data) Interest Income: Loans, including fees $ 7,460 $ 7,435 $ 6,658 $ 6,631 Investment securities, interest bearing cash at Banks 319 318 338 315 Total interest income 7,779 7,753 6,996 6,946 Interest Expense 395 349 330 335 Net Interest Income 7,384 7,404 6,666 6,611 Provision (recovery of provision) for Credit Losses (14 ) 4 12 (22 ) Net Interest Income after Provision for Credit Losses 7,398 7,400 6,654 6,633 Noninterest Income 741 786 1,427 1,561 Noninterest Expense 5,358 4,864 4,824 5,300 Income Before Provision for Taxes 2,781 3,322 3,257 2,894 Provision for Taxes on Income 1,226 1,282 1,236 1,125 Net Income $ 1,555 $ 2,040 $ 2,021 $ 1,769 Net Income per common share Basic $ 0.09 $ 0.12 $ 0.12 $ 0.10 Diluted $ 0.09 $ 0.12 $ 0.12 $ 0.10

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Subsequent events are events or transactions that occur after the balance sheet date but before financial statements are issued. Recognized subsequent events are events or transactions that provide additional evidence about conditions that existed at the date of the balance sheet, including the estimates inherent in the process of preparing financial statements. Nonrecognized subsequent events are events that provide evidence about conditions that did not exist at the date of the balance sheet but arose after that date. Management has reviewed events occurring through the date the financial statements were issued and no subsequent events occurred requiring accrual or disclosure.

Organization and Summary of S31

Organization and Summary of Significant Accounting and Reporting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Organization and Summary of Significant Accounting and Reporting Policies [Abstract]
Basis of Presentation	Basis of Presentation – The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States and with prevailing practices within the banking industry. The consolidated financial statements include the accounts of United Security Bancshares, and its wholly owned subsidiaries, United Security Bank and subsidiary (the “Bank”) and USB Capital Trust II (the "Trust"). The Trust is deconsolidated pursuant to ASC 810. As a result, the Trust Preferred Securities are not presented on the Company’s consolidated financial statements as equity, but instead they are presented as Junior Subordinated Debentures are presented as a separate liability category. (see Note 8 to the Company’s consolidated financial statements). Intercompany accounts and transactions have been eliminated in consolidation. In the following notes, references to the Bank are references to United Security Bank. References to the Company are references to United Security Bancshares, (including the Bank). United Security Bancshares operates as one business segment providing banking services to commercial establishments and individuals primarily in the San Joaquin Valley of California.
Nature of Operations	Nature of Operations – United Security Bancshares is a bank holding company, incorporated in the state of California for the purpose of acquiring all the capital stock of the Bank through a holding company reorganization (the “Reorganization”) of the Bank. The Reorganization, which was accounted for in a manner similar to a pooling of interests, was completed on June 12, 2001. Management believes the Reorganization has provided the Company greater operating and financial flexibility and has permitted expansion into a broader range of financial services and other business activities. During July 2007 the Company formed USB Capital Trust II and issued $15.0 million in Trust Preferred Securities with terms similar to those originally issued under USB Capital Trust I. During 2015, the Bank purchased $3.0 million of the Company's junior subordinated debentures related to the Company's trust preferred securities at a fair value discount of 40% . Subsequently, the Company purchased those shares from the Bank and canceled $3.0 million in par value of the junior subordinated debentures, realizing a $78,000 gain on redemption. The contractual principal balance of the Company's debentures relating to its trust preferred securities is $12.0 million as of December 31, 2017 . (See Note 8. “Junior Subordinated Debt/Trust Preferred Securities”). USB Investment Trust Inc was incorporated effective December 31, 2001, as a special purpose real estate investment trust (“REIT”) under Maryland law. The REIT is a subsidiary of the Bank and was funded with $133.0 million in real estate-secured loans contributed by the Bank. USB Investment Trust was originally formed to give the Bank flexibility in raising capital, and reduce the expenses associated with holding the assets contributed to USB Investment Trust. The Bank was founded in 1987 and currently operates eleven branches and one construction lending office in an area from eastern Madera County to western Fresno County, as well as Taft and Bakersfield in Kern County, and Campbell in Santa Clara County. The Bank also operates one financial services department located in Fresno, California. The Bank’s primary source of revenue is interest income through providing loans to customers, who are predominantly small and middle-market businesses and individuals. The Bank engages in a full compliment of lending activities, including real estate mortgage, commercial and industrial, real estate construction, agricultural and consumer loans, with particular emphasis on short and medium term obligations. The Bank offers a wide range of deposit instruments. These include personal and business checking accounts and savings accounts, interest-bearing negotiable order of withdrawal (NOW) accounts, money market accounts and time certificates of deposit. Most of the Bank's deposits are attracted from individuals and from small and medium-sized business-related sources. The Bank also offers a wide range of specialized services designed to attract and service the needs of commercial customers and account holders. These services include cashiers checks, travelers checks, money orders, and foreign drafts. In addition, the Bank offers Internet banking services to its commercial and retail customers, and offers certain financial and wealth management services through its financial services department. The Bank does not operate a trust department, however it makes arrangements with its correspondent bank to offer trust services to its customers upon request.
Use of Estimates in the Preparation of Financial Statements	Use of Estimates in the Preparation of Financial Statements - The preparation of financial statements in conformity with accounting principles generally accepted 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 assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change, relate to the determination of the allowance for loan losses, determination of goodwill, fair value of junior subordinated debt and certain collateralized mortgage obligations, and the valuation of real estate acquired in connection with foreclosures or in satisfaction of loans.
Subsequent events	Subsequent events —The Company has evaluated events and transactions for potential recognition or disclosure through the day the financial statements were issued.
Significant Accounting Policies	Significant Accounting Policies - The Company follows accounting standards set by the Financial Accounting Standards Board, commonly referred to as “FASB.” FASB sets generally accepted accounting principles (GAAP) that the Company follows to ensure the consistent reporting of its consolidated financial condition, consolidated results of operations, and consolidated cash flows. References to GAAP issued by FASB in these footnotes are to FASB Accounting Standards Codification , sometimes referred to as the Codification or ASC.
Cash and cash equivalents	Cash and cash equivalents – Cash and cash equivalents include cash on hand, amounts due from banks, federal funds sold and repurchase agreements. At times throughout the year, balances can exceed FDIC insurance limits. Generally, federal funds sold and repurchase agreements are sold for one-day periods. The Bank did not have any repurchase agreements during 2017 or 2016 , or at December 31, 2017 and 2016 . All cash and cash equivalents have maturities when purchased of three months or less.
Securities	Securities - Debt and equity securities classified as available for sale are reported at fair value, with unrealized gains and losses excluded from net income and reported, net of tax, as a separate component of comprehensive income and shareholders’ equity. Debt securities classified as held to maturity are carried at amortized cost. Gains and losses on disposition are reported using the specific identification method for the adjusted basis of the securities sold. Premiums and discounts are recognized in interest income using the interest method over the period to maturity. The Company classifies its securities as available for sale or held to maturity, and periodically reviews its investment portfolio on an individual security basis. Securities that are to be held for indefinite periods of time (including, but not limited to, those that management intends to use as part of its asset/liability management strategy, those which may be sold in response to changes in interest rates, changes in prepayments or any such other factors) are classified as securities available for sale. Securities which the Company has the ability and intent to hold to maturity are classified as held to maturity. Investments with fair values that are less than amortized cost are considered impaired. Impairment may result from either a decline in the financial condition of the issuing entity or, in the case of fixed interest rate investments, from rising interest rates. At each financial statement date, management assesses each investment to determine if impaired investments are temporarily impaired or if the impairment is other-than-temporary based upon the positive and negative evidence available. Evidence evaluated includes, but is not limited to, industry analyst reports, credit market conditions, and interest rate trends. Management also assesses whether it intends to sell, or it is more likely than not that it will be required to sell, a security in an unrealized loss position before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the entire difference between the amortized cost and fair value is recognized as impairment through earnings. For debt securities that do not meet the aforementioned criteria, the amount of impairment is split into two components as follows: (1) OTTI related to credit loss, which must be recognized in the income statement; and (2) OTTI related to other factors, which is recognized in other comprehensive income. The credit loss is defined as the difference between the present value of the cash flows expected to be collected and the amortized cost basis. For equity securities, the entire amount of impairment is recognized through earnings.
Loans	Loans - Interest income on loans is credited to income as earned and is calculated by using the simple interest method on the daily balance of the principal amounts outstanding. Loans are placed on non-accrual status when principal or interest is past due for 90 days and/or when management believes the collection of amounts due is doubtful. For loans placed on nonaccrual status, the accrued and unpaid interest receivable may be reversed at management's discretion based upon management's assessment of collectability, and interest is thereafter credited to principal to the extent necessary to eliminate doubt as to the collectability of the net carrying amount of the loan. Nonrefundable fees and related direct costs associated with the origination or purchase of loans are deferred and netted against outstanding loan balances. The net deferred fees and costs are generally amortized into interest income over the loan term using the interest method. Other credit-related fees, such as standby letter of credit fees, loan placement fees and annual credit card fees are recognized as noninterest income during the period the related service is performed.
Allowance for Credit Losses and Reserve for Unfunded Loan Commitments	Allowance for Credit Losses and Reserve for Unfunded Loan Commitments - The allowance for credit losses is maintained to provide for losses that can reasonably be anticipated. The allowance is based on ongoing quarterly assessments of the probable losses inherent in the loan portfolio, and to a lesser extent, unfunded loan commitments. The reserve for unfunded loan commitments is a liability on the Company’s consolidated financial statements and is included in other liabilities. The liability is computed using a methodology similar to that used to determine the allowance for credit losses, modified to take into account the probability of a drawdown on the commitment. The allowance for credit losses is increased by provisions charged to operations during the current period and reduced by negative provisions and loan charge-offs, net of recoveries. Loans are charged against the allowance when management believes that the collection of the principal is unlikely. The allowance is an amount that management believes will be adequate to absorb losses inherent in existing loans, based on evaluations of the probability of collection. In evaluating the probability of collection, management is required to make estimates and assumptions that affect the reported amounts of loans, allowance for credit losses and the provision for credit losses charged to operations. Actual results could differ significantly from those estimates. These evaluations take into consideration such factors as the composition of the portfolio, overall portfolio quality, loan concentrations, specific problem loans, and current economic conditions that may affect the borrowers' ability to pay. The Company’s methodology for assessing the adequacy of the allowance for credit losses consists of several key elements, which include: - the formula allowance - specific allowances for problem graded loans identified as impaired - and the unallocated allowance The formula allowance is calculated by applying loss factors to outstanding loans. Loss factors are based on the Company’s historical loss experience and on the internal risk grade of those loans and, may be adjusted for significant factors, including economic factors that, in management's judgment, affect the collectability of the portfolio as of the evaluation date. Management determines the loss factors for problem graded loans (substandard, doubtful, and loss), special mention loans, and pass graded loans, based on a loss migration model. The migration analysis incorporates loan losses over the previous quarters as determined by management (time horizons adjusted as business cycles or environment changes) and loss factors are adjusted to recognize and quantify the loss exposure from changes in market conditions and trends in the Company’s loan portfolio. Those factors include 1) trends in delinquent and nonaccrual loans, 2) trends in loan volume and terms, 3) effects of changes in lending policies, 4) concentrations of credit, 5) competition, 6) national and local economic trends and conditions, 7) experience of lending staff, 8) loan review and Board of Directors oversight, 9) high balance loan concentrations, and 10) other business conditions. For purposes of this analysis, loans are grouped by internal risk classifications, which are “pass," “special mention,” “substandard,” “doubtful,” and “loss." Certain loans are homogeneous in nature and are therefore pooled by risk grade. These homogeneous loans include consumer installment and home equity loans. Specific allowances are established based on management’s periodic evaluation of loss exposure inherent in impaired loans. For impaired loans, specific allowances are determined based on the collateralized value of the underlying properties, the net present value of the anticipated cash flows, or the market value of the underlying assets. A loan is considered impaired when management determines that it is probable that the Company will be unable to collect all amounts due according to the original contractual terms of the loan agreement. Impairment is measured by the difference between the original recorded investment in the loan and the estimated present value of the total expected future cash flows, discounted at the loan’s effective rate, or the fair value of the collateral, less estimated selling costs, if the loan is collateral dependent. The unallocated portion of the allowance is based upon management’s evaluation of various conditions that are not directly measured in the determination of the formula and specific allowances. The conditions may include, but are not limited to, general economic and business conditions affecting the key lending areas of the Company, credit quality trends, collateral values, loan volumes and concentrations, and other business conditions.
Premises and Equipment	Premises and Equipment - Premises and equipment are carried at cost less accumulated depreciation. Depreciation expense is computed principally on the straight-line method over the estimated useful lives of the assets. Estimated useful lives are as follows: Buildings 31 years Furniture and equipment 3-7 Years
Other Real Estate Owned	Other Real Estate Owned - Real estate properties acquired through, or in lieu of, loan foreclosure are to be sold and are initially recorded at fair value of the property, less estimated costs to sell. The excess, if any, of the loan amount over the fair value is charged to the allowance for credit losses. Subsequent declines in the fair value of other real estate owned, along with related revenue and expenses from operations, are charged to noninterest expense.
Intangible Assets and Goodwill	Intangible Assets and Goodwill - Intangible assets are comprised of core deposit intangibles, other specific identifiable intangibles, and goodwill acquired in branch acquisitions where the consideration given exceeded the fair value of the net assets acquired. Intangible assets and goodwill are reviewed at least annually for impairment. All core deposit intangibles related to previous mergers have been fully amortized. During 2017 and 2016 , the Company recognized no impairment losses on the core deposit intangible related to the deposits purchased in the Legacy merger consummated during February 2007. The Company estimates no aggregate amortization expense related to intangible assets for the next five years. Goodwill amounts resulting from the acquisitions of Taft National Bank during April 2004, and Legacy Bank during February 2007 are considered to have an indefinite life and are not amortized. At December 31, 2017 , goodwill related to Taft National Bank totaled $1.6 million , and goodwill related to Legacy Bank totaled $2.9 million . Impairment testing of goodwill is performed at the reporting level during December of each year for Taft, and during March of each year for Legacy. During 2017 and 2016 , the Company did not recognize impairment adjustments on the goodwill related to the Legacy or Taft Bank mergers (see Note 19 to the Company’s consolidated financial statements contained herein for details of the goodwill impairment.)
Income Taxes	Income Taxes - Deferred income taxes are provided for the temporary differences between the financial reporting basis and the tax basis of the Company's assets and liabilities using the liability method, and are reflected at currently enacted income tax rates applicable to the period in which the deferred tax assets or liabilities are expected to be realized or settled.
Net Income per Share	Net Income per Share - Basic income per common share is computed based on the weighted average number of common shares outstanding. Diluted income per share includes the effect of stock options and other potentially dilutive securities using the treasury stock method to the extent they have a dilutive impact. Net income per share has been retroactively adjusted for all stock dividends declared.
Cash Flow Reporting	Cash Flow Reporting - For purposes of reporting cash flows, cash and cash equivalents include cash on hand, noninterest-bearing amounts due from banks, federal funds sold and securities purchased under agreements to resell. Federal funds and securities purchased under agreements to resell are generally sold for one-day periods. Net cash flows are reported for interest-bearing deposits with other banks, loans to customers, and deposits held for customers.
Transfers of Financial Assets	Transfers of Financial Assets - Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity.
Advertising Costs	Advertising Costs - The Company expenses marketing costs as they are incurred.
Stock Based Compensation	Stock Based Compensation - The Company has a stock-based employee compensation plan, which is described more fully in Note 10. The Company accounts for all share-based payments to employees, including grants of employee stock options and restricted stock units and awards, to be recognized in the financial statements based on the grant date fair value of the award. The fair value is amortized over the requisite service period (generally the vesting period). Included in salaries and employee benefits for the years ended December 31, 2017, 2016, and 2015 are $97,000 , $30,000 , an $26,000 , respectively, of share-based compensation. The related tax benefit, recorded in the provision for income taxes, was not significant. All share data contained within the financial statements has been retroactively restated for stock based transactions (i.e. stock splits and stock dividends.)
Federal Home Loan Bank stock and Federal Reserve Stock	Federal Home Loan Bank stock and Federal Reserve Stock - As a member of the Federal Home Loan Bank (FHLB), the Company is required to maintain an investment in capital stock of the FHLB. In addition, as a member of the Federal Reserve Bank (FRB), the Company is required to maintain an investment in capital stock of the FRB. The investments in both the FHLB and the FRB are carried at cost, which approximates their fair value, in the accompanying consolidated balance sheets under other assets and are subject to certain redemption requirements by the FHLB and FRB. Stock redemptions are at the discretion of the FHLB and FRB. While technically these are considered equity securities, there is no market for the FHLB or FRB stock. Therefore, the shares are considered as restricted investment securities. Management periodically evaluates the stock for other-than-temporary impairment. Management’s determination of whether these investments are impaired is based on its assessment of the ultimate recoverability of cost rather than by recognizing temporary declines in value. The determination of whether a decline affects the ultimate recoverability of cost is influenced by criteria such as (1) the significance of any decline in net assets of the FHLB or FRB as compared to the capital stock amount of the FHLB or FRB and the length of time this situation has persisted, (2) commitments by the FHLB or FRB to make payments required by law or regulation and the level of such payments in relation to the operating performance of the FHLB or FRB, (3) the impact of legislative and regulatory changes on institutions and, accordingly, the customer base of the FHLB or FRB, and (4) the liquidity position of the FHLB or FRB.
Comprehensive Income	Comprehensive Income - Comprehensive income is comprised of net income and other comprehensive income. Other comprehensive income includes items recorded directly to equity, such as unrealized gains and losses on securities available-for-sale and unrecognized costs of salary continuation defined benefit plans. Comprehensive income is presented in the Consolidated Statements of Other Comprehensive Income.
Segment Reporting	Segment Reporting - The Company's operations are solely in the financial services industry and include providing to its customers traditional banking and other financial services. The Company operates primarily in the San Joaquin Valley region of California. Management makes operating decisions and assesses performance based on an ongoing review of the Company's consolidated financial results. Therefore, the Company has a single operating segment for financial reporting purposes.
New Accounting Standards	New Accounting Standards: In May 2014, the Financial Accounting Standard Board (FASB) issued Accounting Standard Update (ASU) 2014-9 (ASU 2014-09), Revenue from Contracts with Customers. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance also specifies the accounting for some costs to obtain or fulfill a contract with a customer, as well as enhanced disclosure requirements. In August 2015, the FASB issued ASU 2015-14 which deferred the effective date of ASU 2014-09 to fiscal years, and interim reporting periods within those fiscal years, beginning after December 15, 2017. In March 2016, the FASB issued ASU 2016-08 which clarified the revenue recognition implementation guidance on principal versus agent considerations and is effective during the same period as ASU 2014-09. In April 2016, the FASB issued ASU 2016-10 which clarified the revenue recognition guidance regarding the identification of performance obligations and the licensing implementation and is effective during the same period as ASU 2014-09. In May 2016, the FASB issued ASU 2016-12 which narrowly amended the revenue recognition guidance regarding collectability, noncash consideration, presentation of sales tax and transition. ASU 2016-12 is effective during the same period as ASU 2014-09. The majority of the Company’s revenue consists of net interest income on financial assets and financial liabilities, which is explicitly excluded from the scope of ASU 2014-09. The Company adopted the new standard beginning January 1, 2018. The Company completed its analysis for determining the extent ASU 2014-09 will affect its noninterest income, primarily in the area of fees and service charges on deposit accounts. Based on the analysis performed, the Company did not have a material change in the timing or measurement of revenues related to noninterest income. The Company will continue to evaluate the effect that this guidance will have on other revenue streams within its scope, as well as changes in disclosures required by the new guidance. However, the Company do not expect this to have a material impact on the Company’s consolidated financial statements. In January 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-01 Financial Instruments-Overall: Recognition and Measurements of Financial Assets and Financial Liabilities. This ASU requires equity investments to be measured at fair value, with changes in fair value recognized in net income. The amendment also simplifies the impairment assessment of equity investments for which fair value is not readily determinable by requiring an entity to perform a qualitative assessment to identify impairment. Further, this ASU eliminates the requirement to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet, requires the use of the exit price notion when measuring the fair value of financial instruments for disclosure purposes, and requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. The ASU is effective for fiscal years beginning after December 15, 2017, and interim periods therein. The Company notes the impact of this standard was to recognize as of January 1, 2018 $262,000 in previously unrealized losses, related to its equity investments classified as available-for-sale, as an adjustment to retained earnings, and to reclassify $2,103,000 from retained earnings to accumulated other comprehensive income related to the instrument-specific credit risk of the Company's trust preferred securities (TRUPS). The Company does not expect any other significant impact from this ASU.
Reclassifications	Reclassifications - Certain reclassifications have been made to prior year financial statements to conform to the classifications used in 2017 . None of the reclassifications had an impact on equity or net income.

Organization and Summary of S32

Organization and Summary of Significant Accounting and Reporting Policies (Tables)	12 Months Ended
	Dec. 31, 2017
Organization and Summary of Significant Accounting and Reporting Policies [Abstract]
Premises and Equipment Estimated Useful Life	Estimated useful lives are as follows: Buildings 31 years Furniture and equipment 3-7 Years

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Comparison of Amortized Cost and Fair Value of Securities Available for Sale	Following is a comparison of the amortized cost and approximate fair value of investment securities at December 31, 2017 and December 31, 2016 : (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (Carrying Amount) December 31, 2017 Securities available for sale: U.S. Government agencies $ 19,683 $ 312 (41 ) $ 19,954 U.S. Government sponsored entities & agencies collateralized by mortgage obligations 22,391 56 (416 ) 22,031 Mutual Funds 4,000 — (263 ) 3,737 Total securities available for sale $ 46,074 $ 368 $ (720 ) $ 45,722 December 31, 2016 Securities available for sale: U.S. Government agencies $ 22,992 $ 280 $ (69 ) $ 23,203 U.S. Government sponsored entities & agencies collateralized by mortgage obligations 30,867 107 (402 ) 30,572 Mutual Funds 4,000 — (284 ) 3,716 Total securities available for sale $ 57,859 $ 387 $ (755 ) $ 57,491
Contractual Maturities on Collateralized Mortgage Obligations	The amortized cost and fair value of securities available for sale at December 31, 2017 , by contractual maturity, are shown below. Actual maturities may differ from contractual maturities because issuers have the right to call or prepay obligations with or without call or prepayment penalties. Contractual maturities on collateralized mortgage obligations cannot be anticipated due to allowed paydowns. Mutual funds are included in the "due in one year or less" category below. December 31, 2017 Amortized Cost Fair Value (Carrying Amount) (In thousands) Due in one year or less $ 4,000 $ 3,737 Due after one year through five years — — Due after five years through ten years 688 699 Due after ten years 18,995 19,255 U.S. Government sponsored entities & agencies collateralized by mortgage obligations 22,391 22,031 $ 46,074 $ 45,722
Temporarily Impaired Investment Securities	The following summarizes temporarily impaired investment securities at December 31, 2017 and 2016 : Less than 12 Months 12 Months or More Total (In thousands) Fair Value (Carrying Amount) Unrealized Losses Fair Value (Carrying Amount) Unrealized Losses Fair Value (Carrying Amount) Unrealized Losses December 31, 2017 Securities available for sale: U.S. Government agencies $ 1,728 $ (3 ) $ 6,625 $ (38 ) $ 8,353 $ (41 ) U.S. Government sponsored entities & agencies collateralized by mortgage obligations 7,483 (154 ) 13,583 (262 ) 21,066 (416 ) Mutual Funds — — 3,737 (263 ) 3,737 (263 ) Total impaired securities $ 9,211 $ (157 ) $ 23,945 $ (563 ) $ 33,156 $ (720 ) December 31, 2016 Securities available for sale: U.S. Government agencies $ 12,281 $ (69 ) $ — $ — $ 12,281 $ (69 ) U.S. Government sponsored entities & agencies collateralized by mortgage obligations 25,904 (402 ) — — 25,904 (402 ) Mutual Funds — — 3,716 (284 ) 3,716 (284 ) Total impaired securities $ 38,185 $ (471 ) $ 3,716 $ (284 ) $ 41,901 $ (755 )

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Loans	Loans are comprised of the following: In thousands) December 31, 2017 December 31, 2016 Commercial and Business loans $ 46,065 $ 47,464 Government Program Loans 961 1,541 Total Commercial and Industrial 47,026 49,005 Real estate – Mortgage: Commercial Real Estate 221,032 200,213 Residential Mortgages 84,804 87,388 Home Improvement and Home Equity loans 457 599 Total Real Estate Mortgage 306,293 288,200 Real Estate Construction and Development 122,970 130,687 Agricultural 59,481 56,918 Installment 65,581 44,949 Total Loans $ 601,351 $ 569,759
Loans to Affiliates	Loans to directors, officers, principal shareholders and their affiliates are summarized below: December 31, (In thousands) 2017 2016 2015 Aggregate amount outstanding, beginning of year $ 5,838 $ 3,754 $ 2,120 New loans or advances during year 440 3,788 3,946 Repayments during year (2,549 ) (1,704 ) (2,312 ) Aggregate amount outstanding, end of year $ 3,729 $ 5,838 $ 3,754 Undisbursed commitments, end of year $ 7,470 $ 4,891 $ 7,431
Delinquent Loans	The following is a summary of delinquent loans at December 31, 2017 (in thousands): December 31, 2017 Loans 30-60 Days Past Due Loans 61-89 Days Past Due Loans 90 or More Days Past Due Total Past Due Loans Current Loans Total Loans Accruing Loans 90 or More Days Past Due Commercial and Business Loans $ — $ — $ 212 $ 212 $ 45,853 $ 46,065 $ — Government Program Loans — — — — 961 961 — Total Commercial and Industrial — — 212 212 46,814 47,026 — Commercial Real Estate Loans 779 — — 779 220,253 221,032 — Residential Mortgages — — 94 94 84,710 84,804 — Home Improvement and Home Equity Loans — — — — 457 457 — Total Real Estate Mortgage 779 — 94 873 305,420 306,293 — Real Estate Construction and Development Loans — — 360 360 122,610 122,970 360 Agricultural Loans — — — — 59,481 59,481 — Consumer Loans — — — — 65,446 65,446 125 Overdraft protection Lines — — — — 38 38 — Overdrafts — — — — 97 97 — Total Installment — — — — 65,581 65,581 125 Total Loans $ 779 $ — $ 666 $ 1,445 $ 599,906 $ 601,351 $ 485 The following is a summary of delinquent loans at December 31, 2016 (in thousands): December 31, 2016 Loans 30-60 Days Past Due Loans 61-89 Days Past Due Loans 90 or More Days Past Due Total Past Due Loans Current Loans Total Loans Accruing Loans 90 or More Days Past Due Commercial and Business Loans $ — $ 432 $ — $ 432 $ 48,009 $ 48,441 $ — Government Program Loans — — 290 290 1,251 1,541 — Total Commercial and Industrial — 432 290 722 49,260 49,982 — Commercial Real Estate Loans — — — — 199,810 199,810 — Residential Mortgages — — — — 87,388 87,388 — Home Improvement and Home Equity Loans — — — — 599 599 — Total Real Estate Mortgage — — — — 287,797 287,797 — Real Estate Construction and Development Loans 166 — 1,250 1,416 128,697 130,113 1,250 Agricultural Loans — — — — 56,918 56,918 — Consumer Loans — — 965 965 43,785 44,750 — Overdraft protection Lines — — — — 48 48 — Overdrafts — — — — 151 151 — Total Installment — — 965 965 43,984 44,949 — Total Loans $ 166 $ 432 $ 2,505 $ 3,103 $ 566,656 $ 569,759 $ 1,250
Nonaccrual Loan Balances	The following is a summary of nonaccrual loan balances at December 31, 2017 and 2016 (in thousands). December 31, 2017 December 31, 2016 Commercial and Business Loans $ 212 $ 275 Government Program Loans — 290 Total Commercial and Industrial 212 565 Commercial Real Estate Loans 454 1,126 Residential Mortgages 288 — Home Improvement and Home Equity Loans — — Total Real Estate Mortgage 742 1,126 Real Estate Construction and Development Loans 4,342 4,608 Agricultural Loans — — Consumer Loans — 965 Total Installment — 965 Total Loans $ 5,296 $ 7,264
Impaired Loans	The following is a summary of impaired loans at December 31, 2017 (in thousands). December 31, 2017 Unpaid Contractual Principal Balance Recorded Investment With No Allowance (1) Recorded Investment With Allowance (1) Total Recorded Investment Related Allowance Average Recorded Investment (2) Interest Recognized (2) Commercial and Business Loans $ 3,255 $ 381 $ 2,887 $ 3,268 $ 534 $ 3,791 $ 229 Government Program Loans 49 50 — 50 — 219 5 Total Commercial and Industrial 3,304 431 2,887 3,318 534 4,010 234 Commercial Real Estate Loans 1,233 — 1,245 1,245 385 1,138 79 Residential Mortgages 3,040 1,199 1,852 3,051 103 2,745 142 Home Improvement and Home Equity Loans — — — — — — — Total Real Estate Mortgage 4,273 1,199 3,097 4,296 488 3,883 221 Real Estate Construction and Development Loans 5,951 5,972 — 5,972 — 6,660 418 Agricultural Loans 1,200 1 1,203 1,204 866 1,179 48 Consumer Loans — — — — — 241 — Total Installment — — — — — 241 — Total Impaired Loans $ 14,728 $ 7,603 $ 7,187 $ 14,790 $ 1,888 $ 15,973 $ 921 (1) The recorded investment in loans includes accrued interest receivable of $ 62 . (2) Information is based on the twelve month period ended December 31, 2017 . The following is a summary of impaired loans at December 31, 2016 (in thousands). December 31, 2016 Unpaid Contractual Principal Balance Recorded Recorded Total Related Allowance Average Interest Recognized (2) Commercial and Business Loans $ 4,635 $ 495 $ 4,158 $ 4,653 $ 757 $ 5,050 $ 302 Government Program Loans 356 356 — 356 — 372 20 Total Commercial and Industrial 4,991 851 4,158 5,009 757 5,422 322 Commercial Real Estate Loans 1,454 — 1,456 1,456 450 1,503 89 Residential Mortgages 2,467 526 1,949 2,475 153 2,874 138 Home Improvement and Home Equity Loans — — — — — — — Total Real Estate Mortgage 3,921 526 3,405 3,931 603 4,377 227 Real Estate Construction and Development Loans 6,267 6,274 — 6,274 — 8,794 361 Agricultural Loans — — — — — 5 8 Consumer Loans 965 965 — 965 — 968 35 Total Installment 965 965 — 965 — 968 35 Total Impaired Loans $ 16,144 $ 8,616 $ 7,563 $ 16,179 $ 1,360 $ 19,566 $ 953 (1) The recorded investment in loans includes accrued interest receivable of $ 35 . (2) Information is based on the twelve month period ended December 31, 2016 . The following is a summary of impaired loans at December 31, 2015 (in thousands). December 31, 2015 Unpaid Contractual Principal Balance Recorded Recorded Total Related Allowance Average Interest Recognized (2) Commercial and Business Loans $ 4,855 $ 541 $ 4,333 $ 4,874 $ 530 $ 2,537 $ 302 Government Program Loans 327 327 — 327 — 358 29 Total Commercial and Industrial 5,182 868 4,333 5,201 530 2,895 331 Commercial Real Estate Loans 1,243 — 1,243 1,243 477 1,618 74 Residential Mortgages 4,032 1,051 2,999 4,050 158 4,092 185 Home Improvement and Home Equity Loans — — — — — 11 — Total Real Estate Mortgage 5,275 1,051 4,242 5,293 635 5,721 259 Real Estate Construction and Development Loans 12,489 5,340 7,179 12,519 1,282 7,781 820 Agricultural Loans 16 16 — 16 — 22 9 Consumer Loans 650 — 650 650 650 1,043 21 Overdraft protection Lines — — — — — — — Overdrafts — — — — — — — Total Installment 650 — 650 650 650 1,043 21 Total Impaired Loans $ 23,612 $ 7,275 $ 16,404 $ 23,679 $ 3,097 $ 17,462 $ 1,440 (1) The recorded investment in loans includes accrued interest receivable of $67 . (2) Information is based on the twelve month period ended December 31, 2015 .
Troubled Debt Restructuring Activity	The following tables illustrate TDR activity for the periods indicated (dollars in thousands): Year ended December 31, 2017 Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Number of Contracts in Default Recorded Investment on Defaulted TDRs Troubled Debt Restructurings Commercial and Business Loans 1 $ 69 $ 69 — $ — Government Program Loans 1 178 178 — — Commercial Real Estate Term Loans — — — — — Single Family Residential Loans 2 404 404 — — Home Improvement and Home Equity Loans — — — — — Real Estate Construction and Development Loans 1 790 790 1 288 Agricultural Loans 3 2,112 2,112 — — Consumer Loans — — — — — Overdraft protection Lines — — — — — Total Loans 8 $ 3,553 $ 3,553 1 $ 288 Year ended December 31, 2016 Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Number of Contracts in Default Recorded Investment on Defaulted TDRs Troubled Debt Restructurings Commercial and Business Loans 5 $ 1,295 $ 1,024 1 $ 290 Government Program Loans 1 100 100 — — Commercial Real Estate Term Loans — — — — — Single Family Residential Loans — — — — — Home Improvement and Home Equity Loans — — — — — Real Estate Construction and Development Loans 1 1,246 1,246 — — Agricultural Loans — — — — — Consumer Loans — — — — — Overdraft protection Lines — — — — — Total Loans 7 $ 2,641 $ 2,370 1 $ 290 December 31, 2015 Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Number of Contracts in Default Recorded Investment on Defaulted TDRs Troubled Debt Restructurings Commercial and Business Loans 1 $ 81 $ 76 — $ — Government Program Loans — — — — — Commercial Real Estate Term Loans — — — — — Single Family Residential Loans 1 258 248 — — Home Improvement and Home Equity Loans — — — — — Real Estate Construction and Development Loans 1 6,446 6,446 — — Agricultural Loans — — — — — Consumer Loans — — — — — Overdraft protection Lines — — — — — Total Loans 3 $ 6,785 $ 6,770 — $ — The following tables summarize TDR activity by loan category for the years ended December 31, 2017, 2016, and 2015 (in thousands). Twelve Months Ended December 31, 2017 Commercial and Industrial Commercial Real Estate Residential Mortgages Home Equity Real Estate Construction and Development Agricultural Installment & Other Total Beginning balance $ 1,356 $ 1,454 $ 2,368 $ — $ 6,267 $ — $ 965 $ 12,410 Defaults — — — — (288 ) — — (288 ) Additions 247 — 404 — 790 2,112 — 3,553 Principal reductions (1,139 ) (221 ) (221 ) — (818 ) (912 ) (965 ) (4,276 ) Charge-offs (28 ) — (9 ) — — — — (37 ) Ending balance $ 436 $ 1,233 $ 2,542 $ — $ 5,951 $ 1,200 $ — $ 11,362 Allowance for loan loss $ 9 $ 385 $ 109 $ — $ — $ 866 $ — $ 1,369 Twelve Months Ended December 31, 2016 Commercial and Industrial Commercial Real Estate Residential Mortgages Home Equity Real Estate Construction and Development Agricultural Installment & Other Total Beginning balance $ 898 $ 1,243 $ 3,533 $ — $ 12,168 $ 16 $ 650 $ 18,508 Defaults (290 ) — — — — — — (290 ) Additions 1,579 1,246 — — — — — 2,825 Principal reductions — (1,035 ) (1,144 ) — (5,901 ) (16 ) 315 (7,781 ) Charge-offs (831 ) — (21 ) $ — $ — $ — $ — (852 ) Ending balance $ 1,356 $ 1,454 $ 2,368 $ — $ 6,267 $ — $ 965 $ 12,410 Allowance for loan loss $ 104 $ 453 $ 157 $ — $ — $ — $ — $ 714 Twelve Months Ended December 31, 2015 Commercial and Industrial Commercial Real Estate Residential Mortgages Home Equity Real Estate Construction and Development Agricultural Installment & Other Total Beginning balance $ 1,306 $ 2,713 $ 4,225 $ — $ 6,029 $ 32 $ 695 $ 15,000 Defaults — — — — — — — — Additions 76 — 248 — 6,446 — — 6,770 — Principal reductions (448 ) (1,470 ) (940 ) — (307 ) (16 ) (45 ) (3,226 ) Charge-offs (36 ) — — — — — — (36 ) Ending balance $ 898 $ 1,243 $ 3,533 $ — $ 12,168 $ 16 $ 650 $ 18,508 Allowance for loan loss $ 32 $ 477 $ 149 $ — $ 384 $ — $ 650 $ 1,692
Credit Risk Rating for Commercial, Construction and Non-consumer Related Loans	The following tables summarize the credit risk ratings for commercial, construction, and other non-consumer related loans for December 31, 2017 and 2016 . The Company did not carry any loans graded as loss at December 31, 2017 or December 31, 2016 . Commercial and Industrial Commercial RE Real Estate Construction and Development Agricultural Total December 31, 2017 (In thousands) Grades 1 and 2 $ 342 $ 2,954 $ — $ 70 $ 3,366 Grade 3 251 1,569 — — 1,820 Grades 4 and 5 – pass 43,264 207,568 104,549 56,817 412,198 Grade 6 – special mention — 8,487 720 994 10,201 Grade 7 – substandard 3,169 454 17,701 1,600 22,924 Grade 8 – doubtful — — — — — Total $ 47,026 $ 221,032 $ 122,970 $ 59,481 $ 450,509 Commercial and Industrial Commercial RE Real Estate Construction and Development Agricultural Total December 31, 2016 (In thousands) Grades 1 and 2 $ 340 $ — $ — $ 75 $ 415 Grade 3 4,823 5,767 — — 10,590 Grades 4 and 5 – pass 34,921 192,699 110,992 56,843 395,455 Grade 6 – special mention 4,416 621 928 — 5,965 Grade 7 – substandard 4,505 1,126 18,767 — 24,398 Grade 8 – doubtful — — — — — Total $ 49,005 $ 200,213 $ 130,687 $ 56,918 $ 436,823
Credit Risk Ratings for Consumer Related Loans and Other Homogenous Loans	The following tables summarize the credit risk ratings for consumer related loans and other homogeneous loans for December 31, 2017 and 2016 (in thousands). December 31, 2017 December 31, 2016 Residential Mortgages Home Improvement and Home Equity Installment Total Residential Mortgages Home Improvement and Home Equity Installment Total Not graded $ 69,249 $ 433 $ 63,565 $ 133,247 $ 69,955 $ 573 $ 41,855 $ 112,383 Pass 13,899 24 2,011 15,934 15,669 26 2,120 17,815 Special Mention 643 — — 643 — — — — Substandard 1,013 — 5 1,018 1,764 — 9 1,773 Doubtful — — — — — — 965 965 Total $ 84,804 $ 457 $ 65,581 $ 150,842 $ 87,388 $ 599 $ 44,949 $ 132,936
Allowance for Credit Loses by Loan Category	The following summarizes the activity in the allowance for credit losses by loan category for the years ended December 31, 2017, 2016, and 2015 (in thousands). December 31, 2017 Commercial and Industrial Real Estate Mortgage Real Estate Construction and Development Loans Agricultural Installment & Other Unallocated Total Beginning balance $ 1,843 $ 1,430 $ 3,378 $ 666 $ 888 $ 697 $ 8,902 Provision (recovery of provision) for credit losses (493 ) (320 ) (475 ) 944 (209 ) 577 24 Charge-offs (122 ) (23 ) — — — (18 ) (163 ) Recoveries 180 95 — 21 208 — 504 Net recoveries(charge-offs) 58 72 — 21 208 (18 ) 341 Ending balance $ 1,408 $ 1,182 $ 2,903 $ 1,631 $ 887 $ 1,256 $ 9,267 Period-end amount allocated to: Loans individually evaluated for impairment 534 488 — 866 — — 1,888 Loans collectively evaluated for impairment 874 694 2,903 765 887 1,256 7,379 Ending balance $ 1,408 $ 1,182 $ 2,903 $ 1,631 $ 887 $ 1,256 $ 9,267 December 31, 2016 Commercial and Industrial Real Estate Mortgage Real Estate Construction and Development Loans Agricultural Installment & Other Unallocated Total Beginning balance $ 1,652 $ 1,449 $ 4,629 $ 655 $ 1,258 $ 70 $ 9,713 Provision for credit losses 980 (15 ) (1,281 ) 32 (388 ) 651 (21 ) Charge-offs (849 ) (29 ) — (21 ) — (24 ) (923 ) Recoveries 60 25 30 0 18 — 133 Net recoveries (charge-offs) (789 ) (4 ) 30 (21 ) 18 (24 ) (790 ) Ending balance $ 1,843 $ 1,430 $ 3,378 $ 666 $ 888 $ 697 $ 8,902 Period-end amount allocated to: Loans individually evaluated for impairment 757 603 — — — 1,360 Loans collectively evaluated for impairment 1,086 827 3,378 666 888 697 7,542 Ending balance $ 1,843 $ 1,430 $ 3,378 $ 666 $ 888 $ 697 $ 8,902 December 31, 2015 Commercial and Industrial Real Estate Mortgage Real Estate Construction and Development Loans Agricultural Installment & Other Unallocated Total Beginning balance $ 1,218 $ 1,653 $ 6,278 $ 482 $ 293 $ 847 $ 10,771 Provision for credit losses 1,201 (369 ) (1,709 ) 173 1,422 (759 ) (41 ) Charge-offs (1,397 ) — — — (467 ) (22 ) (1,886 ) Recoveries 630 165 60 — 10 4 869 Net recoveries (charge-offs) (767 ) 165 60 — (457 ) (18 ) (1,017 ) Ending balance $ 1,652 $ 1,449 $ 4,629 $ 655 $ 1,258 $ 70 $ 9,713 Period-end amount allocated to: Loans individually evaluated for impairment 530 635 1,282 — 650 — 3,097 Loans collectively evaluated for impairment 1,122 814 3,347 655 608 70 6,616 Ending balance $ 1,652 $ 1,449 $ 4,629 $ 655 $ 1,258 $ 70 $ 9,713
Summarized Loan Balances	The following summarizes information with respect to the loan balances at December 31, 2017, 2016, and 2015 . December 31, 2017 Loans Loans Total Loans (In thousands) Commercial and Business Loans $ 3,268 $ 42,797 $ 46,065 Government Program Loans 50 911 961 Total Commercial and Industrial 3,318 43,708 47,026 Commercial Real Estate Loans 1,245 219,787 221,032 Residential Mortgage Loans 3,051 81,753 84,804 Home Improvement and Home Equity Loans — 457 457 Total Real Estate Mortgage 4,296 301,997 306,293 Real Estate Construction and Development Loans 5,972 116,998 122,970 Agricultural Loans 1,204 58,277 59,481 Installment Loans — 65,581 65,581 Total Loans $ 14,790 $ 586,561 $ 601,351 December 31, 2016 Loans Loans Total Loans (In thousands) Commercial and Business Loans $ 4,653 $ 42,811 $ 47,464 Government Program Loans 356 1,185 1,541 Total Commercial and Industrial 5,009 43,996 49,005 Commercial Real Estate Loans 1,456 198,757 200,213 Residential Mortgage Loans 2,475 84,913 87,388 Home Improvement and Home Equity Loans — 599 599 Total Real Estate Mortgage 3,931 284,269 288,200 Real Estate Construction and Development Loans 6,274 124,413 130,687 Agricultural Loans — 56,918 56,918 Installment Loans 965 43,984 44,949 Total Loans $ 16,179 $ 553,580 $ 569,759 December 31, 2015 Loans Loans Total Loans (In thousands) Commercial and Business Loans $ 4,874 $ 49,629 $ 54,503 Government Program Loans 327 996 1,323 Total Commercial and Industrial 5,201 50,625 55,826 Commercial Real Estate Loans 1,243 181,311 182,554 Residential Mortgage Loans 4,050 64,761 68,811 Home Improvement and Home Equity Loans — 867 867 Total Real Estate Mortgage 5,293 246,939 252,232 Real Estate Construction and Development Loans 12,519 118,077 130,596 Agricultural Loans 16 52,121 52,137 Installment Loans 650 23,877 24,527 Total Loans $ 23,679 $ 491,639 $ 515,318

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Premises and Equipment	The components of premises and equipment are as follows: (In thousands) December 31, 2017 December 31, 2016 Land $ 968 $ 968 Buildings and improvements 15,648 14,841 Furniture and equipment 9,642 9,501 26,258 25,310 Less accumulated depreciation and amortization (16,093 ) (14,865 ) Total premises and equipment $ 10,165 $ 10,445

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2017
Deposits [Abstract]
Deposits Summary	Deposits include the following: (In thousands) December 31, 2017 December 31, 2016 Noninterest-bearing deposits $ 307,299 $ 262,697 Interest-bearing deposits: NOW and money market accounts 234,154 235,873 Savings accounts 81,408 75,068 Time deposits: Under $250,000 51,687 87,419 $250,000 and over 13,145 15,572 Total interest-bearing deposits 380,394 413,932 Total deposits $ 687,693 $ 676,629
Maturities of Certificates of Deposits and Other Time Deposits	At December 31, 2017 , the scheduled maturities of all certificates of deposit and other time deposits are as follows: (In thousands) December 31, 2017 One year or less $ 48,704 More than one year, but less than or equal to two years 13,460 More than two years, but less than or equal to three years 738 More than three years, but less than or equal to four years 508 More than four years, but less than or equal to five years 1,422 More than five years — $ 64,832

Taxes on Income (Tables)

Taxes on Income (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Deferred Tax Assets and Liabilities	The tax effects of significant items comprising the Company’s net deferred tax assets (liabilities) are as follows: December 31, (In thousands) 2017 2016 Deferred tax assets: Credit losses not currently deductible $ 3,055 $ 4,151 Deferred compensation 1,300 1,782 Depreciation 324 51 Accrued reserves 90 200 Write-down on other real estate owned 35 534 Unrealized gain on AFS 196 415 Unrealized gain on retirement obligation 104 — Interest on nonaccrual loans 29 36 Other 361 1,897 Total deferred tax assets 5,494 9,066 Deferred tax liabilities: State Tax (152 ) (1,087 ) FHLB dividend (46 ) (65 ) Loss on limited partnership investment (873 ) (1,222 ) Deferred gain ASC 825 – fair value option (896 ) (1,657 ) Fair value adjustments for purchase accounting (99 ) (139 ) Deferred loan costs (835 ) (1,318 ) Specific reserve charge-offs (43 ) — Prepaid expenses (161 ) (280 ) Total deferred tax liabilities (3,105 ) (5,768 ) Net deferred tax assets $ 2,389 $ 3,298
Income Taxes	Income tax expense for the years ended December 31, consist of the following: (In thousands) 2017 Federal State Total Current $ 4,745 $ 1,388 $ 6,133 Deferred (881 ) 1,787 906 $ 3,864 $ 3,175 $ 7,039 2016 Current $ 2,642 $ 28 $ 2,670 Deferred 941 1,258 2,199 $ 3,583 $ 1,286 $ 4,869 2015 Current $ 2,847 $ 10 $ 2,857 Deferred 465 1,175 1,640 $ 3,312 $ 1,185 $ 4,497
Effective Income Tax Rate Reconciliation	A reconciliation of the statutory federal income tax rate to the effective income tax rate is as follows: Year Ended December 31, 2017 2016 2015 Statutory federal income tax rate 35.0 % 34.0 % 34.0 % State franchise tax, net of federal income tax benefit 6.2 6.9 6.9 Tax Cuts and Jobs Act impact on deferred re-measurement 6.3 0.0 0.0 Other (2.6 ) (1.2 ) (1.1 ) 44.9 % 39.7 % 39.8 %

Stock Based Compensation (Table

Stock Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options Activity	A summary of the status of the Company's stock option plan and changes during the year are presented below: Shares (a) Weighted Average Exercise Price Options outstanding December 31, 2016 (a) 37,115 $ 3.83 Granted during the year 60,000 10.15 Exercised during the year 2,514 2.55 Forfeited during the year — — Options outstanding December 31, 2017 94,601 $ 7.87 (a) Options have been adjusted for stock dividends A summary of the status of the Company's restricted stock and changes during the year are presented below: Shares (a) Weighted Average Grant-Date Fair Value Non-vested units at December 31, 2016 (b) 12,015 $ 5.13 Granted during the year 41,917 10.92 Vested during the year 7,421 7.24 Canceled during the year — — Non-vested units at December 31, 2017 46,511 $ 9.57 (b) Shares have been adjusted for stock dividends
Intrinsic Value of Stock Options Exercised	December 31, 2017 December 31, 2016 December 31, 2015 Weighted average grant-date fair value per share of stock options granted $ 7.18 $ — $ — Total fair value of stock options vested $ 17,845 $ 19,650 $ 19,640 Total intrinsic value of stock options exercised $ 12,383 $ 4,500 $ —
Stock Options Valuation Assumptions	The assumptions used for the 2017 , 2016 , and 2015 awards are as follows: Year Ended Year Ended Year Ended December 31, 2017 December 31, 2016 December 31, 2015 Risk Free Interest Rate 1.94% —% —% Expected Dividend Yield —% —% —% Expected Life in Years 10 years 0 years 0 years Expected Price Volatility 62.60% —% —%

Commitments and Contingent Li39

Commitments and Contingent Liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Rental Payments for Operating Leases	Future minimum rental commitments under existing non-cancelable leases as of December 31, 2017 are as follows: (In thousands): 2018 $ 710 2019 534 2020 484 2021 288 2022 282 Thereafter 806 $ 3,104
Financial Instruments Off-balance Sheet Risks	The credit risk associated with these instruments is essentially the same as that involved in extending credit to customers and is represented by the contractual amount indicated in the table below: Contractual amount – December 31, (In thousands) 2017 2016 Commitments to extend credit $ 99,958 $ 120,485 Standby letters of credit 2,058 1,201

Fair Value Measurements and D40

Fair Value Measurements and Disclosure (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	The table below is a summary of fair value estimates for financial instruments and the level of the fair value hierarchy within which the fair value measurements are categorized at the periods indicated: December 31, 2017 (In thousands) Carrying Amount Estimated Fair Value Quoted Prices In Active Markets for Identical Assets Level 1 Significant Other Observable Inputs Level 2 Significant Unobservable Inputs Level 3 Financial Assets: Cash and cash equivalents $ 107,934 $ 107,934 $ 107,934 $ — $ — Investment securities 45,722 45,722 3,737 41,985 — Loans 593,123 588,938 — — 588,938 Accrued interest receivable 6,526 6,526 — 6,526 — Financial Liabilities: Deposits: Noninterest-bearing 307,299 307,299 307,299 — — NOW and money market 234,154 234,154 234,154 — — Savings 81,408 81,408 81,408 — — Time deposits 64,832 64,387 — — 64,387 Total deposits 687,693 687,248 622,861 — 64,387 Junior subordinated debt 9,730 9,730 — — 9,730 Accrued interest payable 44 44 — 44 — December 31, 2016 (In thousands) Carrying Amount Estimated Fair Value Quoted Prices In Active Markets for Identical Assets Level 1 Significant Other Observable Inputs Level 2 Significant Unobservable Inputs Level 3 Financial Assets: Cash and cash equivalents $ 113,032 $ 113,032 $ 113,032 $ — $ — Interest-bearing deposits 650 650 — 650 — Investment securities 57,491 57,491 3,716 53,775 — Loans 561,932 557,914 — — 557,914 Accrued interest receivable 3,895 3,895 — 3,895 — Financial Liabilities: Deposits: Noninterest-bearing 262,697 262,697 262,697 — — NOW and money market 235,873 235,873 235,873 — — Savings 75,068 75,068 75,068 — — Time deposits 102,991 102,743 — — 102,743 Total deposits 676,629 676,381 573,638 — 102,743 Junior subordinated debt 8,832 8,832 — — 8,832 Accrued interest payable 76 76 — 76 —
Assets and Liabilities Measured at Fair Value on Recurring and Non-recurring Basis	The following tables summarize the Company’s assets and liabilities that were measured at fair value on a recurring and non-recurring basis as of December 31, 2017 (in 000’s): Description of Assets December 31, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) AFS Securities (2): U.S. Government agencies $ 19,954 $ — $ 19,954 $ — U.S Govt collateralized mortgage obligations 22,031 — 22,031 — Mutual Funds 3,737 3,737 — — Total AFS securities 45,722 3,737 41,985 — Impaired Loans (1): Commercial and industrial — — — — Real estate mortgage — — — — RE construction & development — — — — Agricultural — — — — Installment/Other — — — — Total impaired loans — — — — Other real estate owned (1) — — — — Total $ 45,722 $ 3,737 $ 41,985 $ — Description of Liabilities December 31, 2017 Quoted Prices (Level 1) Significant (Level 2) Significant (Level 3) Junior subordinated debt (2) $ 9,730 $ — $ — $ 9,730 Total $ 9,730 $ — $ — $ 9,730 (1) Nonrecurring (2) Recurring The following tables summarize the Company’s assets and liabilities that were measured at fair value on a recurring and non-recurring basis as of December 31, 2016 (in 000’s): Description of Assets December 31, 2016 Quoted Prices (Level 1) Significant (Level 2) Significant (Level 3) AFS Securities (2): U.S. Government agencies $ 23,203 $ — $ 23,203 $ — U.S Govt collateralized mortgage obligations 30,572 — 30,572 — Mutual Funds 3,716 3,716 — — Total AFS securities 57,491 3,716 53,775 — Impaired Loans (1): Commercial and industrial 301 — — 301 Real estate mortgage — — — — RE construction & development — — — — Agricultural — — — — Installment/Other — — — — Total impaired loans 301 — — 301 Other real estate owned (1) — — — — Total $ 57,792 $ 3,716 $ 53,775 $ 301 Description of Liabilities December 31, 2016 Quoted Prices (Level 1) Significant (Level 2) Significant (Level 3) Junior subordinated debt (2) $ 8,832 $ — $ — $ 8,832 Total $ 8,832 $ — $ — $ 8,832 (1) Nonrecurring (2) Recurring
Quantitative information about fair value measurements on Company's assets	The following table presents quantitative information about Level 3 fair value measurements for the Company's assets measured at fair value on a non-recurring basis at December 31, 2016 (in 000's). There were no assets measured at fair value on a non-recurring basis at December 31, 2017 . December 31, 2016 Financial Instrument Fair Value Valuation Technique Unobservable Input Range, Weighted Average Impaired Loans: Commercial and industrial $301 Sales Comparison Approach Adjustment for difference between comparable sales 7%-29%, 19.1%
Significant Unobservable Inputs (Level 3) on a Recurring Basis	The following tables provide a reconciliation of liabilities at fair value using significant unobservable inputs (Level 3) on a recurring basis during the period (in 000’s): December 31, 2017 December 31, 2016 December 31, 2015 Reconciliation of Liabilities: Junior Subordinated Debt Junior Subordinated Debt Junior Subordinated Debt Beginning balance $ 8,832 $ 8,300 $ 10,115 Total losses included in earnings 882 518 73 Canceled debt — — (1,122 ) Gain on redemption of liability — — 78 Capitalized interest 16 1,050 (698 ) Ending balance $ 9,730 $ 8,832 $ 8,300 The amount of total losses for the period included in earnings attributable to the change in unrealized gains or losses relating to liabilities still held at the reporting date $ 882 $ 518 $ 73
Description of the Valuation Technique, Unobservable Input, and Qualitative Information about the Unobservable Inputs for the Company's Assets and Liabilities Classified as Level 3 and Measured at Fair Value on a Recurring Basis	The following table provides a description of the valuation technique, unobservable input, and qualitative information about the unobservable inputs for the Company’s liabilities classified as Level 3 and measured at fair value on a recurring basis at December 31, 2017 and 2016 : December 31, 2017 December 31, 2016 Financial Instrument Valuation Technique Unobservable Input Weighted Average Financial Instrument Valuation Technique Unobservable Input Weighted Average Subordinated Debt Discounted cash flow Discount Rate 5.81% Subordinated Debt Discounted cash flow Discount Rate 6.46%

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2017
Banking and Thrift [Abstract]
Capital Requirements under Banking Regulations	The following table shows the Company’s and the Bank’s regulatory capital and regulatory capital ratios at December 31, 2017 and 2016 , as compared to the applicable capital adequacy guidelines: To Be Well Capitalized Under Actual For Capital Adequacy Purposes Prompt Corrective Action Provisions (In thousands) Amount Ratio Amount Ratio Amount Ratio As of December 31, 2017 (Company): Total Capital (to Risk Weighted Assets) $ 115,265 17.54 % $ 52,560 8.00 % N/A N/A Tier 1 Capital (to Risk Weighted Assets) 107,043 16.29 % 39,420 6.00 % N/A N/A Common Equity Tier 1 (to Risk Weighted Assets) 97,313 14.81 % 29,565 4.50 % N/A N/A Tier 1 Leverage (to Average Assets) 107,043 13.01 % 32,899 4.00 % N/A N/A As of December 31, 2017 (Bank): Total Capital (to Risk Weighted Assets) $ 113,653 17.31 % $ 52,511 8.00 % $ 65,638 10.00 % Tier 1 Capital (to Risk Weighted Assets) 105,431 16.06 % 39,383 6.00 % 52,511 8.00 % Common Equity Tier 1 (to Risk Weighted Assets) 105,431 16.06 % 29,537 4.50 % 42,665 6.50 % Tier 1 Leverage (to Average Assets) 105,431 12.90 % 32,732 4.00 % 40,865 5.00 % As of December 31, 2016 (Company): Total Capital (to Risk Weighted Assets) $ 108,868 17.26 % $ 50,454 8.00 % N/A N/A Tier 1 Capital (to Risk Weighted Assets) 100,968 16.01 % 37,840 6.00 % N/A N/A Common Equity Tier 1 (to Risk Weighted Assets) 92,600 14.68 % 30,630 4.50 % N/A N/A Tier 1 Leverage (to Average Assets) 100,968 12.97 % 30,956 4.00 % N/A N/A As of December 31, 2016 (Bank): Total Capital (to Risk Weighted Assets) $ 108,400 17.19 % $ 50,454 8.00 % $ 63,068 10.00 % Tier 1 Capital (to Risk Weighted Assets) 100,500 15.94 % 37,840 6.00 % 50,454 8.00 % Common Equity Tier 1 (to Risk Weighted Assets) 100,500 15.94 % 30,630 4.50 % 40,994 6.50 % Tier 1 Leverage (to Average Assets) 100,500 12.99 % 30,956 4.00 % 38,695 5.00 % As of December 31, 2015 (Company): Total Capital (to Risk Weighted Assets) $ 100,659 16.65 % $ 48,358 8.00 % N/A N/A Tier 1 Capital (to Risk Weighted Assets) 93,073 15.40 % 36,269 6.00 % N/A N/A Common Equity Tier 1 (to Risk Weighted Assets) 85,237 14.10 % 27,201 4.50 % N/A N/A Tier 1 Leverage (to Average Assets) 93,073 12.95 % 28,747 4.00 % N/A N/A As of December 31, 2015 (Bank): Total Capital (to Risk Weighted Assets) $ 100,544 16.69 % $ 48,204 8.00 % $ 71,870 10.00 % Tier 1 Capital (to Risk Weighted Assets) 92,981 15.43 % 36,153 6.00 % 57,496 8.00 % Common Equity Tier 1 (to Risk Weighted Assets) 92,981 15.43 % 27,115 4.50 % 46,716 6.50 % Tier 1 Leverage (to Average Assets) 92,981 12.94 % 28,748 4.00 % 35,935 5.00 %

Supplemental Cash Flow Disclo42

Supplemental Cash Flow Disclosures (Tables)	12 Months Ended
	Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Disclosures	Year Ended December 31, (In thousands) 2017 2016 2015 Cash paid during the period for: Interest $ 1,762 $ 1,362 $ 1,243 Income Taxes 6,863 1,710 3,080 Noncash activities: Loans transferred to foreclosed property — — 226 OREO financed — 3,766 — Unrealized gains (losses) on securities 16 (648 ) (265 ) Unrealized (losses) gains on unrecognized post retirement costs (6 ) (22 ) 224

Net Income Per Share (Tables)

Net Income Per Share (Tables)	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Computation of Income Per Share	The following table provides a reconciliation of the numerator and the denominator of the basic net income per share computation with the numerator and the denominator of the diluted net income per share computation. Prior year amounts have been restated to reflect the impact of stock dividends. Year Ended December 31, (In thousands, except earnings per share data) 2017 2016 2015 Net income available to common shareholders $ 8,640 $ 7,385 $ 6,810 Weighted average shares outstanding 16,885,587 16,881,379 16,880,563 Add: dilutive effect of stock options 19,328 7,648 2,234 Weighted average shares outstanding adjusted for potential dilution 16,904,915 16,889,027 16,882,797 Basic earnings per share $ 0.51 $ 0.44 $ 0.40 Diluted earnings per share $ 0.51 $ 0.44 $ 0.40 Anti-dilutive shares excluded from earnings per share calculation 98,000 21,000 132,000

Parent Company Only Financial44

Parent Company Only Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Financial Statements of Parent	The following are the condensed financial statements of United Security Bancshares and should be read in conjunction with the consolidated financial statements: United Security Bancshares – (parent only) Balance Sheets - December 31, 2017 and 2016 (In thousands) 2017 2016 Assets Cash and equivalents $ 1,656 $ 148 Investment in bank subsidiary 109,472 104,554 Other assets 1,136 2,525 Total assets 112,264 107,227 Liabilities & Shareholders' Equity Liabilities: Junior subordinated debt securities (at fair value) 9,730 8,832 Deferred taxes — 1,741 Dividends declared 1,182 — Total liabilities 10,912 10,573 Shareholders' Equity: Common stock, no par value 20,000,000 shares authorized, 16,885,615 and 16,705,594 issued and outstanding, at December 31, 2017 and December 31, 2016, respectively 57,880 56,557 Retained earnings 44,182 40,701 Accumulated other comprehensive loss (710 ) (604 ) Total shareholders' equity 101,352 96,654 Total liabilities and shareholders' equity $ 112,264 $ 107,227 United Security Bancshares – (parent only) Year ended December 31, Income Statements (In thousands) 2017 2016 2015 Income Loss on fair value of financial liability $ (882 ) $ (518 ) $ (73 ) Gain on redemption of JR subordinated debentures — — 78 Dividends from subsidiary 4,291 424 2,416 Total income 3,409 (94 ) 2,421 Expense Interest expense 302 240 225 Other expense 269 241 256 Total expense 571 481 481 Income (loss) before taxes and equity in undistributed income of subsidiary 2,838 (575 ) 1,940 Income tax benefit (989 ) (411 ) (196 ) Undistributed income of subsidiary 4,813 7,549 4,674 Net Income $ 8,640 $ 7,385 $ 6,810 United Security Bancshares – (parent only) Year ended December 31, Statement of Cash Flows (In thousands) 2017 2016 2015 Cash Flows From Operating Activities Net income $ 8,640 $ 7,385 $ 6,810 Adjustments to reconcile net income to cash provided by operating activities: Equity in undistributed income of subsidiary (4,813 ) (7,549 ) (4,674 ) Provision for deferred income taxes (751 ) (169 ) (518 ) Loss on fair value option of financial liability 882 518 73 Gain on redemption of junior subordinated debentures — — (78 ) Decrease (increase) in income tax receivable 391 (198 ) 117 Net change in other assets/liabilities 23 15 (14 ) Net cash provided by operating activities 4,372 2 1,716 Cash Flows From Financing Activities Proceeds from exercise of stock options 6 6 — Dividends paid (2,870 ) — — Redemption of junior subordinated debenture — — (1,800 ) Net cash (used in) provided by financing activities (2,864 ) 6 (1,800 ) Net increase (decrease) increase in cash and cash equivalents 1,508 8 (84 ) Cash and cash equivalents at beginning of year 148 140 224 Cash and cash equivalents at end of year $ 1,656 $ 148 $ 140

Summary of Quarterly Results 45

Summary of Quarterly Results of Operation (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Summary of Quarterly Results of Operations	Summary of Quarterly Results of Operations (unaudited) The following table sets forth the results of operations for the four quarters of 2017 and 2016, and is unaudited; however, in the opinion of Management, it reflects all adjustments (which include only normal recurring adjustments) necessary to present fairly the summarized results for such periods. 2017 Quarters Ended December 31, September 30, June 30, March 31, (dollars in thousands, except per share data) Interest Income: Loans, including fees $ 8,035 $ 7,978 $ 7,579 $ 7,225 Investment securities, interest bearing cash at Banks 560 614 531 408 Total interest income 8,595 8,592 8,110 7,633 Interest Expense 451 435 438 405 Net Interest Income 8,144 8,157 7,672 7,228 Provision (recovery of provision) for Credit Losses 48 7 (52 ) 21 Net Interest Income after Provision for Credit Losses 8,096 8,150 7,724 7,207 Noninterest Income 1,155 1,176 1,066 909 Noninterest Expense 5,260 4,746 4,607 5,190 Income Before Provision for Taxes 3,991 4,580 4,183 2,926 Provision for Taxes on Income 2,354 1,840 1,691 1,155 Net Income $ 1,637 $ 2,740 $ 2,492 $ 1,771 Net Income per common share Basic $ 0.10 $ 0.16 $ 0.15 $ 0.10 Diluted $ 0.10 $ 0.16 $ 0.15 $ 0.10 2016 Quarters Ended December 31, September 30, June 30, March 31, (dollars in thousands, except per share data) Interest Income: Loans, including fees $ 7,460 $ 7,435 $ 6,658 $ 6,631 Investment securities, interest bearing cash at Banks 319 318 338 315 Total interest income 7,779 7,753 6,996 6,946 Interest Expense 395 349 330 335 Net Interest Income 7,384 7,404 6,666 6,611 Provision (recovery of provision) for Credit Losses (14 ) 4 12 (22 ) Net Interest Income after Provision for Credit Losses 7,398 7,400 6,654 6,633 Noninterest Income 741 786 1,427 1,561 Noninterest Expense 5,358 4,864 4,824 5,300 Income Before Provision for Taxes 2,781 3,322 3,257 2,894 Provision for Taxes on Income 1,226 1,282 1,236 1,125 Net Income $ 1,555 $ 2,040 $ 2,021 $ 1,769 Net Income per common share Basic $ 0.09 $ 0.12 $ 0.12 $ 0.10 Diluted $ 0.09 $ 0.12 $ 0.12 $ 0.10

Organization and Summary of S46

Organization and Summary of Significant Accounting and Reporting Policies (Details)	Jan. 01, 2018USD ($)	Sep. 30, 2015USD ($)	Aug. 31, 2015USD ($)	Dec. 31, 2017USD ($)segmentofficebranchdepartment	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Jul. 31, 2013USD ($)	Sep. 30, 2009USD ($)	Jul. 31, 2007USD ($)
Basis of Presentation [Abstract]
Number of operating segments | segment				1
Debt Instrument [Line Items]
Amount issued in trust preferred securities				$ 12,000,000			$ 15,000,000		$ 15,000,000
Gain on redemption of JR subordinated debentures				0	$ 0	$ 78,000
Nature of Operations [Abstract]
Real estate secured loans				$ 133,000,000
Number of branches | branch				11
Number of construction lending offices | office				1
Number of financial services departments | department				1
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net				$ 0
Period of estimated intangible amortization expense				5 years
Goodwill				$ 4,488,000	4,488,000
Advertising Costs [Abstract]
Advertising expense				154,000	126,000	127,000
Stock Based Compensation [Abstract]
Share-based compensation				97,000	30,000	$ 26,000
Taft National Bank
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill				1,600,000
Legacy Bank
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill				$ 2,900,000
Scenario, forecast | Retained Earnings | Accounting Standards Update 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New accounting pronouncement, effect of adoption	$ (262,000)
Scenario, forecast | AOCI | Accounting Standards Update 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New accounting pronouncement, effect of adoption	$ 2,103,000
Buildings
Property, Plant and Equipment [Line Items]
Estimated useful life				31 years
Furniture and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life				3 years
Furniture and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life				7 years
Junior Subordinated Debt
Debt Instrument [Line Items]
Amount issued in trust preferred securities				$ 12,000,000				$ 15,000,000
Fair value discount (percentage)			40.00%
Gain on redemption of JR subordinated debentures		$ 78,000
Junior Subordinated Debt | United Security Bank
Debt Instrument [Line Items]
Amount issued in trust preferred securities			$ 3,000,000
Core Deposits
Acquired Finite-Lived Intangible Assets [Line Items]
Impairment loss on intangible assets				$ 0	$ 0

Investment Securities (Details)

Investment Securities (Details)	12 Months Ended
	Dec. 31, 2017USD ($)segmentsecurity	Dec. 31, 2016USD ($)security	Dec. 31, 2015USD ($)
Comparison of amortized cost and fair value of securities available for sale [Abstract]
Amortized Cost	$ 46,074,000	$ 57,859,000
Gross Unrealized Gains	368,000	387,000
Gross Unrealized Losses	(720,000)	(755,000)
Fair Value (Carrying Amount)	45,722,000	57,491,000
Gross realized gains (losses), sale proceeds	0	0	$ 0
Realized losses on sales of available-for-sale securities	0	0	0
Realized gains on sales of available-for-sale securities	0	0	0
Other-than-temporary impairment losses	0	0	$ 0
Amortized Cost
Due in one year or less	4,000,000
Due after one year through five years	0
Due after five years through ten years	688,000
Due after ten years	18,995,000
U.S. Government sponsored entities & agencies collateralized by mortgage obligations	22,391,000
Amortized Cost	46,074,000	57,859,000
Fair Value (Carrying Amount)
Due in one year or less	3,737,000
Due after one year through five years	0
Due after five years through ten years	699,000
Due after ten years	19,255,000
U.S. Government sponsored entities & agencies collateralized by mortgage obligations	22,031,000
Fair Value (Carrying Amount)	45,722,000	57,491,000
Fair value of available-for-sale securities pledged as collateral for FHLB borrowings	34,542,543	16,670,290
Trading securities	0	0
Held-to-maturity Securities	0	0
Summarizes temporarily impaired investment securities [Abstract]
Less than 12 Months, Fair Value (Carrying Amount)	9,211,000	38,185,000
Less than 12, Unrealized Losses	(157,000)	(471,000)
12 Months or More, Fair Value (Carrying Amount)	23,945,000	3,716,000
12 Months or More, Unrealized Losses	(563,000)	(284,000)
Total Fair Value (Carrying Amount)	33,156,000	41,901,000
Total Unrealized Losses	$ (720,000)	(755,000)
Number of general segments for the segregation of portfolio | segment	2
U.S. Government agencies
Comparison of amortized cost and fair value of securities available for sale [Abstract]
Amortized Cost	$ 19,683,000	22,992,000
Gross Unrealized Gains	312,000	280,000
Gross Unrealized Losses	(41,000)	(69,000)
Fair Value (Carrying Amount)	19,954,000	23,203,000
Amortized Cost
Amortized Cost	19,683,000	22,992,000
Summarizes temporarily impaired investment securities [Abstract]
Less than 12 Months, Fair Value (Carrying Amount)	1,728,000	12,281,000
Less than 12, Unrealized Losses	(3,000)	(69,000)
12 Months or More, Fair Value (Carrying Amount)	6,625,000	0
12 Months or More, Unrealized Losses	(38,000)	0
Total Fair Value (Carrying Amount)	8,353,000	12,281,000
Total Unrealized Losses	$ (41,000)	$ (69,000)
Number of impaired securities | security	3	4
U.S. Government sponsored entities & agencies collateralized by mortgage obligations
Comparison of amortized cost and fair value of securities available for sale [Abstract]
Amortized Cost	$ 22,391,000	$ 30,867,000
Gross Unrealized Gains	56,000	107,000
Gross Unrealized Losses	(416,000)	(402,000)
Fair Value (Carrying Amount)	22,031,000	30,572,000
Amortized Cost
Amortized Cost	22,391,000	30,867,000
Summarizes temporarily impaired investment securities [Abstract]
Less than 12 Months, Fair Value (Carrying Amount)	7,483,000	25,904,000
Less than 12, Unrealized Losses	(154,000)	(402,000)
12 Months or More, Fair Value (Carrying Amount)	13,583,000	0
12 Months or More, Unrealized Losses	(262,000)	0
Total Fair Value (Carrying Amount)	21,066,000	25,904,000
Total Unrealized Losses	$ (416,000)	$ (402,000)
Number of impaired securities | security	11	11
Mutual Funds
Comparison of amortized cost and fair value of securities available for sale [Abstract]
Amortized Cost	$ 4,000,000	$ 4,000,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(263,000)	(284,000)
Fair Value (Carrying Amount)	3,737,000	3,716,000
Amortized Cost
Amortized Cost	4,000,000	4,000,000
Summarizes temporarily impaired investment securities [Abstract]
Less than 12 Months, Fair Value (Carrying Amount)	0	0
Less than 12, Unrealized Losses	0	0
12 Months or More, Fair Value (Carrying Amount)	3,737,000	3,716,000
12 Months or More, Unrealized Losses	(263,000)	(284,000)
Total Fair Value (Carrying Amount)	3,737,000	3,716,000
Total Unrealized Losses	$ (263,000)	$ (284,000)
Number of impaired securities | security	1	1
Carrying Amount
Fair Value (Carrying Amount)
Fair value of available-for-sale securities pledged as collateral for FHLB borrowings	$ 34,780,746	$ 19,653,625

Loans (Details)

Loans (Details)	12 Months Ended
	Dec. 31, 2017USD ($)loan	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 601,351,000	$ 569,759,000	$ 515,318,000
Installment loans, consumer, student	60,595,000
Accrued interest	6,526,000	3,895,000
Total	450,509,000	436,823,000
Loans to directors, officers, principal shareholders and their affiliates [Roll Forward]
Aggregate amount outstanding, beginning of year	5,838,000	3,754,000	2,120,000
New loans or advances during year	440,000	3,788,000	3,946,000
Repayments during year	(2,549,000)	(1,704,000)	(2,312,000)
Aggregate amount outstanding, end of year	3,729,000	5,838,000	3,754,000
Undisbursed commitments, end of year	7,470,000	4,891,000	$ 7,431,000
Commitments to extend credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial instrument commitments	99,958,000	120,485,000
Standby letters of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial instrument commitments	$ 2,058,000	1,201,000
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity period	3 years
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity period	15 years
Commercial and Business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 46,065,000	47,464,000
Government Program Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	961,000	1,541,000
Total Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 47,026,000	49,005,000
Percentage of total loans (percent)	7.80%
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 221,032,000	200,213,000
Residential Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	84,804,000	87,388,000
Home Improvement and Home Equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	457,000	599,000
Total Real Estate Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 306,293,000	288,200,000
Percentage of total loans (percent)	50.90%
Real Estate Construction and Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 122,970,000	130,687,000
Percentage of total loans (percent)	20.40%
Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 59,481,000	56,918,000
Percentage of total loans (percent)	9.90%
Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 65,581,000	$ 44,949,000
Percentage of total loans (percent)	10.90%
Student loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest	$ 4,261,000
Number of loans | loan	180
Repayment | Student loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 6,473,000
Deferment | Student loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans outstanding	1,128,000
Forbearance | Student loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans outstanding	$ 1,981,000

Loans, Part II (Details)

Loans, Part II (Details)	12 Months Ended
	Dec. 31, 2017USD ($)payment	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	$ 1,445,000	$ 3,103,000
Current Loans	599,906,000	566,656,000
Total Loans	601,351,000	569,759,000	$ 515,318,000
Accruing Loans 90 or More Days Past Due	485,000	1,250,000
Nonaccrual loan balance	$ 5,296,000	7,264,000
Nonaccrual loans balances [Abstract]
Minimum period of default	90 days
Number of monthly payments to demonstrate repayment ability | payment	6
Remaining undisbursed commitments, loan funds	$ 0	0
Commercial and Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	212,000	432,000
Current Loans	45,853,000	48,009,000
Total Loans	46,065,000	48,441,000
Accruing Loans 90 or More Days Past Due	0	0
Nonaccrual loan balance	212,000	275,000
Government Program Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	290,000
Current Loans	961,000	1,251,000
Total Loans	961,000	1,541,000
Accruing Loans 90 or More Days Past Due	0	0
Nonaccrual loan balance	0	290,000
Total Commercial and Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	212,000	722,000
Current Loans	46,814,000	49,260,000
Total Loans	47,026,000	49,982,000
Accruing Loans 90 or More Days Past Due	0	0
Nonaccrual loan balance	212,000	565,000
Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	779,000	0
Current Loans	220,253,000	199,810,000
Total Loans	221,032,000	199,810,000
Accruing Loans 90 or More Days Past Due	0	0
Nonaccrual loan balance	454,000	1,126,000
Residential Mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	94,000	0
Current Loans	84,710,000	87,388,000
Total Loans	84,804,000	87,388,000
Accruing Loans 90 or More Days Past Due	0	0
Nonaccrual loan balance	288,000	0
Home Improvement and Home Equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Current Loans	457,000	599,000
Total Loans	457,000	599,000
Accruing Loans 90 or More Days Past Due	0	0
Nonaccrual loan balance	0	0
Total Real Estate Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	873,000	0
Current Loans	305,420,000	287,797,000
Total Loans	306,293,000	287,797,000
Accruing Loans 90 or More Days Past Due	0	0
Nonaccrual loan balance	742,000	1,126,000
Real Estate Construction and Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	360,000	1,416,000
Current Loans	122,610,000	128,697,000
Total Loans	122,970,000	130,113,000
Accruing Loans 90 or More Days Past Due	360,000	1,250,000
Nonaccrual loan balance	4,342,000	4,608,000
Agricultural Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Current Loans	59,481,000	56,918,000
Total Loans	59,481,000	56,918,000
Accruing Loans 90 or More Days Past Due	0	0
Nonaccrual loan balance	0	0
Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	965,000
Current Loans	65,446,000	43,785,000
Total Loans	65,446,000	44,750,000
Accruing Loans 90 or More Days Past Due	125,000	0
Nonaccrual loan balance	0	965,000
Overdraft protection Lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Current Loans	38,000	48,000
Total Loans	38,000	48,000
Accruing Loans 90 or More Days Past Due	0	0
Overdrafts
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Current Loans	97,000	151,000
Total Loans	97,000	151,000
Accruing Loans 90 or More Days Past Due	0	0
Installment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	965,000
Current Loans	65,581,000	43,984,000
Total Loans	65,581,000	44,949,000
Accruing Loans 90 or More Days Past Due	125,000	0
Nonaccrual loan balance	0	965,000
Loans 30-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	779,000	166,000
Loans 30-60 Days Past Due | Commercial and Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 30-60 Days Past Due | Government Program Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 30-60 Days Past Due | Total Commercial and Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 30-60 Days Past Due | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	779,000	0
Loans 30-60 Days Past Due | Residential Mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 30-60 Days Past Due | Home Improvement and Home Equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 30-60 Days Past Due | Total Real Estate Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	779,000	0
Loans 30-60 Days Past Due | Real Estate Construction and Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	166,000
Loans 30-60 Days Past Due | Agricultural Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 30-60 Days Past Due | Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 30-60 Days Past Due | Overdraft protection Lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 30-60 Days Past Due | Overdrafts
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 30-60 Days Past Due | Installment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	432,000
Loans 61-89 Days Past Due | Commercial and Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	432,000
Loans 61-89 Days Past Due | Government Program Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due | Total Commercial and Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	432,000
Loans 61-89 Days Past Due | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due | Residential Mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due | Home Improvement and Home Equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due | Total Real Estate Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due | Real Estate Construction and Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due | Agricultural Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due | Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due | Overdraft protection Lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due | Overdrafts
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due | Installment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 90 or More Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	666,000	2,505,000
Loans 90 or More Days Past Due | Commercial and Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	212,000	0
Loans 90 or More Days Past Due | Government Program Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	290,000
Loans 90 or More Days Past Due | Total Commercial and Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	212,000	290,000
Loans 90 or More Days Past Due | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 90 or More Days Past Due | Residential Mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	94,000	0
Loans 90 or More Days Past Due | Home Improvement and Home Equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 90 or More Days Past Due | Total Real Estate Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	94,000	0
Loans 90 or More Days Past Due | Real Estate Construction and Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	360,000	1,250,000
Loans 90 or More Days Past Due | Agricultural Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 90 or More Days Past Due | Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	965,000
Loans 90 or More Days Past Due | Overdraft protection Lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 90 or More Days Past Due | Overdrafts
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 90 or More Days Past Due | Installment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	$ 0	$ 965,000

Loans, Part III (Details)

Loans, Part III (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	$ 14,728	$ 16,144	$ 23,612
Recorded Investment With No Allowance	7,603	8,616	7,275
Recorded Investment With Allowance	7,187	7,563	16,404
Total Recorded Investment	14,790	16,179	23,679
Related Allowance	1,888	1,360	3,097
Average Recorded Investment	15,973	19,566	17,462
Interest Recognized	921	953	1,440
Accrued interest receivable	62	35	67
Commercial and Business loans
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	3,255	4,635	4,855
Recorded Investment With No Allowance	381	495	541
Recorded Investment With Allowance	2,887	4,158	4,333
Total Recorded Investment	3,268	4,653	4,874
Related Allowance	534	757	530
Average Recorded Investment	3,791	5,050	2,537
Interest Recognized	229	302	302
Government Program Loans
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	49	356	327
Recorded Investment With No Allowance	50	356	327
Recorded Investment With Allowance	0	0	0
Total Recorded Investment	50	356	327
Related Allowance	0	0	0
Average Recorded Investment	219	372	358
Interest Recognized	5	20	29
Total Commercial and Industrial
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	3,304	4,991	5,182
Recorded Investment With No Allowance	431	851	868
Recorded Investment With Allowance	2,887	4,158	4,333
Total Recorded Investment	3,318	5,009	5,201
Related Allowance	534	757	530
Average Recorded Investment	4,010	5,422	2,895
Interest Recognized	234	322	331
Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	1,233	1,454	1,243
Recorded Investment With No Allowance	0	0	0
Recorded Investment With Allowance	1,245	1,456	1,243
Total Recorded Investment	1,245	1,456	1,243
Related Allowance	385	450	477
Average Recorded Investment	1,138	1,503	1,618
Interest Recognized	79	89	74
Residential Mortgages
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	3,040	2,467	4,032
Recorded Investment With No Allowance	1,199	526	1,051
Recorded Investment With Allowance	1,852	1,949	2,999
Total Recorded Investment	3,051	2,475	4,050
Related Allowance	103	153	158
Average Recorded Investment	2,745	2,874	4,092
Interest Recognized	142	138	185
Home Improvement and Home Equity loans
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	0	0	0
Recorded Investment With No Allowance	0	0	0
Recorded Investment With Allowance	0	0	0
Total Recorded Investment	0	0	0
Related Allowance	0	0	0
Average Recorded Investment	0	0	11
Interest Recognized	0	0	0
Total Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	4,273	3,921	5,275
Recorded Investment With No Allowance	1,199	526	1,051
Recorded Investment With Allowance	3,097	3,405	4,242
Total Recorded Investment	4,296	3,931	5,293
Related Allowance	488	603	635
Average Recorded Investment	3,883	4,377	5,721
Interest Recognized	221	227	259
Real Estate Construction and Development Loans
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	5,951	6,267	12,489
Recorded Investment With No Allowance	5,972	6,274	5,340
Recorded Investment With Allowance	0	0	7,179
Total Recorded Investment	5,972	6,274	12,519
Related Allowance	0	0	1,282
Average Recorded Investment	6,660	8,794	7,781
Interest Recognized	418	361	820
Agricultural Loans
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	1,200	0	16
Recorded Investment With No Allowance	1	0	16
Recorded Investment With Allowance	1,203	0	0
Total Recorded Investment	1,204	0	16
Related Allowance	866	0	0
Average Recorded Investment	1,179	5	22
Interest Recognized	48	8	9
Consumer Loans
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	0	965	650
Recorded Investment With No Allowance	0	965	0
Recorded Investment With Allowance	0	0	650
Total Recorded Investment	0	965	650
Related Allowance	0	0	650
Average Recorded Investment	241	968	1,043
Interest Recognized	0	35	21
Installment
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	0	965	650
Recorded Investment With No Allowance	0	965	0
Recorded Investment With Allowance	0	0	650
Total Recorded Investment	0	965	650
Related Allowance	0	0	650
Average Recorded Investment	241	968	1,043
Interest Recognized	$ 0	$ 35	21
Overdraft protection Lines
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance			0
Recorded Investment With No Allowance			0
Recorded Investment With Allowance			0
Total Recorded Investment			0
Related Allowance			0
Average Recorded Investment			0
Interest Recognized			0
Overdrafts
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance			0
Recorded Investment With No Allowance			0
Recorded Investment With Allowance			0
Total Recorded Investment			0
Related Allowance			0
Average Recorded Investment			0
Interest Recognized			$ 0

Loans, Part IV (Details)

Loans, Part IV (Details)	12 Months Ended
	Dec. 31, 2017USD ($)contractloan	Dec. 31, 2016USD ($)contractloan	Dec. 31, 2015USD ($)contract
Financing Receivable, Modifications [Line Items]
Period of successful payment history used for restructured loan accrual status	6 months
Troubled Debt Restructurings [Abstract]
Number of Contracts | contract	8	7	3
Pre- Modification Outstanding Recorded Investment	$ 3,553,000	$ 2,641,000	$ 6,785,000
Post- Modification Outstanding Recorded Investment	$ 3,553,000	$ 2,370,000	$ 6,770,000
Number of Contracts in Default | contract	1	1	0
Recorded Investment on Defaulted TDRs	$ 288,000	$ 290,000	$ 0
Financing Receivable, Modifications, Recorded Investment [Roll Forward]
Beginning balance	12,410,000	18,508,000	15,000,000
Defaults	(288,000)	(290,000)	0
Additions	3,553,000	2,825,000	6,770,000
Principal reductions	(4,276,000)	(7,781,000)	(3,226,000)
Charge-offs	(37,000)	(852,000)	(36,000)
Ending balance	11,362,000	12,410,000	18,508,000
Allowance for loan loss	$ 1,369,000	$ 714,000	$ 1,692,000
Number of restructured loans | loan	25	28
Total restructured loans	$ 11,362,000	$ 12,410,000
Troubled debt restructuring, commitment to lend	$ 0	$ 0
Commercial and Business loans
Troubled Debt Restructurings [Abstract]
Number of Contracts | contract	1	5	1
Pre- Modification Outstanding Recorded Investment	$ 69,000	$ 1,295,000	$ 81,000
Post- Modification Outstanding Recorded Investment	$ 69,000	$ 1,024,000	$ 76,000
Number of Contracts in Default | contract	0	1	0
Recorded Investment on Defaulted TDRs	$ 0	$ 290,000	$ 0
Government Program Loans
Troubled Debt Restructurings [Abstract]
Number of Contracts | contract	1	1	0
Pre- Modification Outstanding Recorded Investment	$ 178,000	$ 100,000	$ 0
Post- Modification Outstanding Recorded Investment	$ 178,000	$ 100,000	$ 0
Number of Contracts in Default | contract	0	0	0
Recorded Investment on Defaulted TDRs	$ 0	$ 0	$ 0
Commercial Real Estate
Troubled Debt Restructurings [Abstract]
Number of Contracts | contract	0	0	0
Pre- Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Post- Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Number of Contracts in Default | contract	0	0	0
Recorded Investment on Defaulted TDRs	$ 0	$ 0	$ 0
Financing Receivable, Modifications, Recorded Investment [Roll Forward]
Beginning balance	1,454,000	1,243,000	2,713,000
Defaults	0	0	0
Additions	0	1,246,000	0
Principal reductions	(221,000)	(1,035,000)	(1,470,000)
Charge-offs	0	0	0
Ending balance	1,233,000	1,454,000	1,243,000
Allowance for loan loss	$ 385,000	$ 453,000	$ 477,000
Single Family Residential Loans
Troubled Debt Restructurings [Abstract]
Number of Contracts | contract	2	0	1
Pre- Modification Outstanding Recorded Investment	$ 404,000	$ 0	$ 258,000
Post- Modification Outstanding Recorded Investment	$ 404,000	$ 0	$ 248,000
Number of Contracts in Default | contract	0	0	0
Recorded Investment on Defaulted TDRs	$ 0	$ 0	$ 0
Installment & Other
Financing Receivable, Modifications, Recorded Investment [Roll Forward]
Beginning balance	965,000	650,000	695,000
Defaults	0	0	0
Additions	0	0	0
Principal reductions	(965,000)	315,000	(45,000)
Charge-offs	0	0	0
Ending balance	0	965,000	650,000
Allowance for loan loss	$ 0	$ 0	$ 650,000
Home Improvement and Home Equity loans
Troubled Debt Restructurings [Abstract]
Number of Contracts | contract	0	0	0
Pre- Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Post- Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Number of Contracts in Default | contract	0	0	0
Recorded Investment on Defaulted TDRs	$ 0	$ 0	$ 0
Financing Receivable, Modifications, Recorded Investment [Roll Forward]
Beginning balance	0	0	0
Defaults	0	0	0
Additions	0	0	0
Principal reductions	0	0	0
Charge-offs	0	0	0
Ending balance	0	0	0
Allowance for loan loss	$ 0	$ 0	$ 0
Real Estate Construction and Development
Troubled Debt Restructurings [Abstract]
Number of Contracts | contract	1	1	1
Pre- Modification Outstanding Recorded Investment	$ 790,000	$ 1,246,000	$ 6,446,000
Post- Modification Outstanding Recorded Investment	$ 790,000	$ 1,246,000	$ 6,446,000
Number of Contracts in Default | contract	1	0	0
Recorded Investment on Defaulted TDRs	$ 288,000	$ 0	$ 0
Financing Receivable, Modifications, Recorded Investment [Roll Forward]
Beginning balance	6,267,000	12,168,000	6,029,000
Defaults	(288,000)	0	0
Additions	790,000	0	6,446,000
Principal reductions	(818,000)	(5,901,000)	(307,000)
Charge-offs	0	0	0
Ending balance	5,951,000	6,267,000	12,168,000
Allowance for loan loss	0	0	384,000
Residential Mortgages
Financing Receivable, Modifications, Recorded Investment [Roll Forward]
Beginning balance	2,368,000	3,533,000	4,225,000
Defaults	0	0	0
Additions	404,000	0	248,000
Principal reductions	(221,000)	(1,144,000)	(940,000)
Charge-offs	(9,000)	(21,000)	0
Ending balance	2,542,000	2,368,000	3,533,000
Allowance for loan loss	109,000	157,000	149,000
Total Commercial and Industrial
Financing Receivable, Modifications, Recorded Investment [Roll Forward]
Beginning balance	1,356,000	898,000	1,306,000
Defaults	0	(290,000)	0
Additions	247,000	1,579,000	76,000
Principal reductions	(1,139,000)	0	(448,000)
Charge-offs	(28,000)	(831,000)	(36,000)
Ending balance	436,000	1,356,000	898,000
Allowance for loan loss	$ 9,000	$ 104,000	$ 32,000
Agricultural
Troubled Debt Restructurings [Abstract]
Number of Contracts | contract	3	0	0
Pre- Modification Outstanding Recorded Investment	$ 2,112,000	$ 0	$ 0
Post- Modification Outstanding Recorded Investment	$ 2,112,000	$ 0	$ 0
Number of Contracts in Default | contract	0	0	0
Recorded Investment on Defaulted TDRs	$ 0	$ 0	$ 0
Financing Receivable, Modifications, Recorded Investment [Roll Forward]
Beginning balance	0	16,000	32,000
Defaults	0	0	0
Additions	2,112,000	0	0
Principal reductions	(912,000)	(16,000)	(16,000)
Charge-offs	0	0	0
Ending balance	1,200,000	0	16,000
Allowance for loan loss	$ 866,000	$ 0	$ 0
Consumer Loans
Troubled Debt Restructurings [Abstract]
Number of Contracts | contract	0	0	0
Pre- Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Post- Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Number of Contracts in Default | contract	0	0	0
Recorded Investment on Defaulted TDRs	$ 0	$ 0	$ 0
Overdraft protection Lines
Troubled Debt Restructurings [Abstract]
Number of Contracts | contract	0	0	0
Pre- Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Post- Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Number of Contracts in Default | contract	0	0	0
Recorded Investment on Defaulted TDRs	$ 0	$ 0	$ 0

Loans, Part V (Details)

Loans, Part V (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)rating	Dec. 31, 2016USD ($)
Financing Receivable, Recorded Investment [Line Items]
Number of risk rating approaches | rating	2
Credit risk ratings [Abstract]
Total	$ 450,509	$ 436,823
Commercial and Industrial
Credit risk ratings [Abstract]
Total	47,026	49,005
Commercial RE
Credit risk ratings [Abstract]
Total	221,032	200,213
Real Estate Construction and Development Loans
Credit risk ratings [Abstract]
Total	122,970	130,687
Agricultural
Credit risk ratings [Abstract]
Total	59,481	56,918
Residential Mortgages
Credit risk ratings [Abstract]
Total	84,804	87,388
Home Improvement and Home Equity
Credit risk ratings [Abstract]
Total	457	599
Installment
Credit risk ratings [Abstract]
Total	65,581	44,949
Consumer Related Loans and Other Homogenous Loans
Credit risk ratings [Abstract]
Total	150,842	132,936
Grades 1 and 2
Credit risk ratings [Abstract]
Total	3,366	415
Grades 1 and 2 | Commercial and Industrial
Credit risk ratings [Abstract]
Total	342	340
Grades 1 and 2 | Commercial RE
Credit risk ratings [Abstract]
Total	2,954	0
Grades 1 and 2 | Real Estate Construction and Development Loans
Credit risk ratings [Abstract]
Total	0	0
Grades 1 and 2 | Agricultural
Credit risk ratings [Abstract]
Total	70	75
Grade 3
Credit risk ratings [Abstract]
Total	1,820	10,590
Grade 3 | Commercial and Industrial
Credit risk ratings [Abstract]
Total	251	4,823
Grade 3 | Commercial RE
Credit risk ratings [Abstract]
Total	1,569	5,767
Grade 3 | Real Estate Construction and Development Loans
Credit risk ratings [Abstract]
Total	0	0
Grade 3 | Agricultural
Credit risk ratings [Abstract]
Total	0	0
Grades 4 and 5 – pass
Credit risk ratings [Abstract]
Total	$ 412,198	395,455
Grades 4 and 5 – pass | Minimum
Financing Receivable, Recorded Investment [Line Items]
Notes receivable, period of loss recognition	3 years
Grades 4 and 5 – pass | Maximum
Financing Receivable, Recorded Investment [Line Items]
Notes receivable, period of loss recognition	4 years
Grades 4 and 5 – pass | Commercial and Industrial
Credit risk ratings [Abstract]
Total	$ 43,264	34,921
Grades 4 and 5 – pass | Commercial RE
Credit risk ratings [Abstract]
Total	207,568	192,699
Grades 4 and 5 – pass | Real Estate Construction and Development Loans
Credit risk ratings [Abstract]
Total	104,549	110,992
Grades 4 and 5 – pass | Agricultural
Credit risk ratings [Abstract]
Total	56,817	56,843
Grade 6 – special mention
Credit risk ratings [Abstract]
Total	10,201	5,965
Grade 6 – special mention | Commercial and Industrial
Credit risk ratings [Abstract]
Total	0	4,416
Grade 6 – special mention | Commercial RE
Credit risk ratings [Abstract]
Total	8,487	621
Grade 6 – special mention | Real Estate Construction and Development Loans
Credit risk ratings [Abstract]
Total	720	928
Grade 6 – special mention | Agricultural
Credit risk ratings [Abstract]
Total	994	0
Grade 7 – substandard
Credit risk ratings [Abstract]
Total	22,924	24,398
Grade 7 – substandard | Commercial and Industrial
Credit risk ratings [Abstract]
Total	3,169	4,505
Grade 7 – substandard | Commercial RE
Credit risk ratings [Abstract]
Total	454	1,126
Grade 7 – substandard | Real Estate Construction and Development Loans
Credit risk ratings [Abstract]
Total	17,701	18,767
Grade 7 – substandard | Agricultural
Credit risk ratings [Abstract]
Total	1,600	0
Grade 8 – doubtful
Credit risk ratings [Abstract]
Total	0	0
Grade 8 – doubtful | Commercial and Industrial
Credit risk ratings [Abstract]
Total	0	0
Grade 8 – doubtful | Commercial RE
Credit risk ratings [Abstract]
Total	0	0
Grade 8 – doubtful | Real Estate Construction and Development Loans
Credit risk ratings [Abstract]
Total	0	0
Grade 8 – doubtful | Agricultural
Credit risk ratings [Abstract]
Total	0	0
Not graded | Residential Mortgages
Credit risk ratings [Abstract]
Total	69,249	69,955
Not graded | Home Improvement and Home Equity
Credit risk ratings [Abstract]
Total	433	573
Not graded | Installment
Credit risk ratings [Abstract]
Total	63,565	41,855
Not graded | Consumer Related Loans and Other Homogenous Loans
Credit risk ratings [Abstract]
Total	133,247	112,383
Pass | Residential Mortgages
Credit risk ratings [Abstract]
Total	13,899	15,669
Pass | Home Improvement and Home Equity
Credit risk ratings [Abstract]
Total	24	26
Pass | Installment
Credit risk ratings [Abstract]
Total	2,011	2,120
Pass | Consumer Related Loans and Other Homogenous Loans
Credit risk ratings [Abstract]
Total	15,934	17,815
Special Mention | Residential Mortgages
Credit risk ratings [Abstract]
Total	643	0
Special Mention | Home Improvement and Home Equity
Credit risk ratings [Abstract]
Total	0	0
Special Mention | Installment
Credit risk ratings [Abstract]
Total	0	0
Special Mention | Consumer Related Loans and Other Homogenous Loans
Credit risk ratings [Abstract]
Total	643	0
Substandard | Residential Mortgages
Credit risk ratings [Abstract]
Total	1,013	1,764
Substandard | Home Improvement and Home Equity
Credit risk ratings [Abstract]
Total	0	0
Substandard | Installment
Credit risk ratings [Abstract]
Total	5	9
Substandard | Consumer Related Loans and Other Homogenous Loans
Credit risk ratings [Abstract]
Total	1,018	1,773
Doubtful | Residential Mortgages
Credit risk ratings [Abstract]
Total	0	0
Doubtful | Home Improvement and Home Equity
Credit risk ratings [Abstract]
Total	0	0
Doubtful | Installment
Credit risk ratings [Abstract]
Total	0	965
Doubtful | Consumer Related Loans and Other Homogenous Loans
Credit risk ratings [Abstract]
Total	$ 0	$ 965
Consumer loans
Financing Receivable, Recorded Investment [Line Items]
Loan, triggering event, aging	180 days

Loans, Part VI (Details)

Loans, Part VI (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2017USD ($)segmentloan	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of loan portfolio segment | segment		11
Number of loans entity experienced losses over past twelve quarters | loan		6
Summarizes activity in allowance for credit losses by loan category [Roll Forward]
Beginning balance		$ 8,902	$ 9,713	$ 10,771
Provision (recovery of provision) for credit losses		24	(21)	(41)
Charge-offs		(163)	(923)	(1,886)
Recoveries		504	133	869
Net recoveries(charge-offs)		341	(790)	(1,017)
Ending balance	$ 9,267	9,267	8,902	9,713
Period-end amount allocated to:
Loans individually evaluated for impairment					$ 1,888	$ 1,360	$ 3,097
Loans collectively evaluated for impairment					7,379	7,542	6,616
Ending balance	9,267	$ 8,902	9,713	10,771	9,267	8,902	9,713
Loans Individually Evaluated for Impairment					14,790	16,179	23,679
Loans Collectively Evaluated for Impairment					586,561	553,580	491,639
Total Loans					601,351	569,759	515,318
Consumer Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of loan portfolio segment | segment		3
Commercial and Business loans
Period-end amount allocated to:
Loans Individually Evaluated for Impairment					3,268	4,653	4,874
Loans Collectively Evaluated for Impairment					42,797	42,811	49,629
Total Loans					46,065	47,464	54,503
Government Program Loans
Period-end amount allocated to:
Loans Individually Evaluated for Impairment					50	356	327
Loans Collectively Evaluated for Impairment					911	1,185	996
Total Loans					961	1,541	1,323
Total Commercial and Industrial
Summarizes activity in allowance for credit losses by loan category [Roll Forward]
Beginning balance		$ 1,843	1,652	1,218
Provision (recovery of provision) for credit losses		(493)	980	1,201
Charge-offs		(122)	(849)	(1,397)
Recoveries		180	60	630
Net recoveries(charge-offs)		58	(789)	(767)
Ending balance	1,408	1,408	1,843	1,652
Period-end amount allocated to:
Loans individually evaluated for impairment					534	757	530
Loans collectively evaluated for impairment					874	1,086	1,122
Ending balance	1,408	1,843	1,652	1,218	1,408	1,843	1,652
Loans Individually Evaluated for Impairment					3,318	5,009	5,201
Loans Collectively Evaluated for Impairment					43,708	43,996	50,625
Total Loans					47,026	49,005	55,826
Commercial Real Estate Loans
Period-end amount allocated to:
Loans Individually Evaluated for Impairment					1,245	1,456	1,243
Loans Collectively Evaluated for Impairment					219,787	198,757	181,311
Total Loans					221,032	200,213	182,554
Residential Mortgage Loans
Period-end amount allocated to:
Loans Individually Evaluated for Impairment					3,051	2,475	4,050
Loans Collectively Evaluated for Impairment					81,753	84,913	64,761
Total Loans					84,804	87,388	68,811
Home Improvement and Home Equity loans
Period-end amount allocated to:
Loans Individually Evaluated for Impairment					0	0	0
Loans Collectively Evaluated for Impairment					457	599	867
Total Loans					457	599	867
Total Real Estate Mortgage
Summarizes activity in allowance for credit losses by loan category [Roll Forward]
Beginning balance		1,430	1,449	1,653
Provision (recovery of provision) for credit losses		(320)	(15)	(369)
Charge-offs		(23)	(29)	0
Recoveries		95	25	165
Net recoveries(charge-offs)		72	(4)	165
Ending balance	1,182	1,182	1,430	1,449
Period-end amount allocated to:
Loans individually evaluated for impairment					488	603	635
Loans collectively evaluated for impairment					694	827	814
Ending balance	1,182	1,430	1,449	1,653	1,182	1,430	1,449
Loans Individually Evaluated for Impairment					4,296	3,931	5,293
Loans Collectively Evaluated for Impairment					301,997	284,269	246,939
Total Loans					306,293	288,200	252,232
Real Estate Construction and Development Loans
Summarizes activity in allowance for credit losses by loan category [Roll Forward]
Beginning balance		3,378	4,629	6,278
Provision (recovery of provision) for credit losses		(475)	(1,281)	(1,709)
Charge-offs		0	0	0
Recoveries		0	30	60
Net recoveries(charge-offs)		0	30	60
Ending balance	2,903	2,903	3,378	4,629
Period-end amount allocated to:
Loans individually evaluated for impairment					0	0	1,282
Loans collectively evaluated for impairment					2,903	3,378	3,347
Ending balance	2,903	3,378	4,629	6,278	2,903	3,378	4,629
Loans Individually Evaluated for Impairment					5,972	6,274	12,519
Loans Collectively Evaluated for Impairment					116,998	124,413	118,077
Total Loans					122,970	130,687	130,596
Agricultural
Summarizes activity in allowance for credit losses by loan category [Roll Forward]
Beginning balance		666	655	482
Provision (recovery of provision) for credit losses		944	32	173
Charge-offs		0	(21)	0
Recoveries		21	0	0
Net recoveries(charge-offs)		21	(21)	0
Ending balance	1,631	1,631	666	655
Period-end amount allocated to:
Loans individually evaluated for impairment					866		0
Loans collectively evaluated for impairment					765	666	655
Ending balance	1,631	666	655	482	1,631	666	655
Loans Individually Evaluated for Impairment					1,204	0	16
Loans Collectively Evaluated for Impairment					58,277	56,918	52,121
Total Loans					59,481	56,918	52,137
Installment & Other
Summarizes activity in allowance for credit losses by loan category [Roll Forward]
Beginning balance		888	1,258	293
Provision (recovery of provision) for credit losses		(209)	(388)	1,422
Charge-offs		0	0	(467)
Recoveries		208	18	10
Net recoveries(charge-offs)		208	18	(457)
Ending balance	887	887	888	1,258
Period-end amount allocated to:
Loans individually evaluated for impairment					0	0	650
Loans collectively evaluated for impairment					887	888	608
Ending balance	887	888	1,258	293	887	888	1,258
Loans Individually Evaluated for Impairment					0	965	650
Loans Collectively Evaluated for Impairment					65,581	43,984	23,877
Total Loans					65,581	44,949	24,527
Unallocated
Summarizes activity in allowance for credit losses by loan category [Roll Forward]
Beginning balance		697	70	847
Provision (recovery of provision) for credit losses		577	651	(759)
Charge-offs		(18)	(24)	(22)
Recoveries	0	0		4
Net recoveries(charge-offs)		(18)	(24)	(18)
Ending balance	1,256	1,256	697	70
Period-end amount allocated to:
Loans individually evaluated for impairment					0	0	0
Loans collectively evaluated for impairment					1,256	697	70
Ending balance	$ 1,256	$ 697	$ 70	$ 847	$ 1,256	$ 697	$ 70

Premises and Equipment (Details

Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 26,258	$ 25,310
Less accumulated depreciation and amortization	(16,093)	(14,865)
Total premises and equipment	10,165	10,445
Depreciation expenses on premises equipment	1,335	1,428	$ 1,462
Land
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	968	968
Buildings and improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	15,648	14,841
Furniture and equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 9,642	$ 9,501

Investment in Limited Partner55

Investment in Limited Partnership (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Loss on California tax credit partnership	$ 109,000	$ 158,000	$ 73,000
Investment tax credit	1,800,000
Tax credits utilized for income tax	0	0	0
Income	$ 7,000	$ 900	$ 0
Limited Partnership
Schedule of Equity Method Investments [Line Items]
Ownership (percent)	9.14%
Total investment	$ 1,601,000

Deposits (Details)

Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deposits [Abstract]
Noninterest-bearing deposits	$ 307,299	$ 262,697
Interest-bearing deposits:
NOW and money market accounts	234,154	235,873
Savings accounts	81,408	75,068
Time deposits:
$250000	51,687	87,419
$250,000 and over	13,145	15,572
Total interest-bearing deposits	380,394	413,932
Total deposits	687,693	676,629
Maturities of Deposits [Abstract]
One year or less	48,704
More than one year, but less than or equal to two years	13,460
More than two years, but less than or equal to three years	738
More than three years, but less than or equal to four years	508
More than four years, but less than or equal to five years	1,422
More than five years	0
Time Deposits	64,832
Brokered time deposits	7,421	28,132
Contractual maturities, time deposits, $250,000 or more, three months or less	6,535
Contractual maturities, time deposits, $250,000 or more, three months through six months	485
Deposit overdrafts	293	283
Deposits of related parties	$ 8,747	$ 9,299

Short-term Borrowings_Other B57

Short-term Borrowings/Other Borrowings (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Short-term Debt [Line Items]
Short-term debt outstanding	$ 0	$ 0
Federal Reserve Bank of San Francisco
Short-term Debt [Line Items]
Unused borrowing lines	305,236,000	323,162,000
Qualifying loans pledged as collateral for borrowing lines	473,364,000	470,881,000
Federal Home Loan Bank (FHLB)
Short-term Debt [Line Items]
Unused borrowing lines	13,363,000	2,037,000
Investment securities pledged as collateral	17,049,000	2,152,000
Pacific Coast Bankers Bank (PCBB)
Short-term Debt [Line Items]
Unused borrowing lines	10,000,000	10,000,000
Zions First National Bank
Short-term Debt [Line Items]
Unused borrowing lines	$ 20,000,000	$ 20,000,000

Junior Subordinated Debt_Trus58

Junior Subordinated Debt/Trust Preferred Securities (Details)	Sep. 30, 2009USD ($)	Sep. 30, 2015USD ($)	Aug. 31, 2015USD ($)	Jul. 31, 2007USD ($)	Dec. 31, 2017USD ($)quarter	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Jul. 31, 2013USD ($)
Debt Instrument [Line Items]
Amount of junior subordinated debentures relating to trust preferred securities				$ 15,000,000	$ 12,000,000			$ 15,000,000
Maximum number of consecutive quarters the entity defer interest payments without default or penalty | quarter					20
Gain on redemption of JR subordinated debentures					$ 0	$ 0	$ 78,000
Gain (loss) on fair value of financial liability					(882,000)	(518,000)	(73,000)
Junior Subordinated Debt
Debt Instrument [Line Items]
Amount of junior subordinated debentures relating to trust preferred securities	$ 15,000,000				12,000,000
Life of debt instrument				30 years
Debt instrument variable interest rate (percent)				1.29%
Initial coupon rate (percent)				6.65%
Frequency of interest payment	quarterly
Accrued and unpaid interest on debt					80,000	$ 64,000
Fair value discount (percentage)			40.00%
Amount of debt canceled		$ 3,000,000					$ 3,000,000
Gain on redemption of JR subordinated debentures		$ 78,000
Cumulative gain recorded on debt					$ 2,814,000
Junior Subordinated Debt | Discounted Cash Flow Valuation Technique | Significant Unobservable Inputs Level 3
Debt Instrument [Line Items]
Discount rate used in the valuation of debt instrument (percent)					5.81%	6.46%
United Security Bank | Junior Subordinated Debt
Debt Instrument [Line Items]
Amount of junior subordinated debentures relating to trust preferred securities			$ 3,000,000

Taxes on Income (Details)

Taxes on Income (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Credit losses not currently deductible	$ 3,055,000				$ 4,151,000				$ 3,055,000	$ 4,151,000
Deferred compensation	1,300,000				1,782,000				1,300,000	1,782,000
Depreciation	324,000				51,000				324,000	51,000
Accrued reserves	90,000				200,000				90,000	200,000
Write-down on other real estate owned	35,000				534,000				35,000	534,000
Unrealized gain on AFS	196,000				415,000				196,000	415,000
Unrealized gain on retirement obligation	104,000				0				104,000	0
Interest on nonaccrual loans	29,000				36,000				29,000	36,000
Other	361,000				1,897,000				361,000	1,897,000
Total deferred tax assets	5,494,000				9,066,000				5,494,000	9,066,000
Deferred tax liabilities:
State Tax	(152,000)				(1,087,000)				(152,000)	(1,087,000)
FHLB dividend	(46,000)				(65,000)				(46,000)	(65,000)
Loss on limited partnership investment	(873,000)				(1,222,000)				(873,000)	(1,222,000)
Deferred gain ASC 825 – fair value option	(896,000)				(1,657,000)				(896,000)	(1,657,000)
Fair value adjustments for purchase accounting	(99,000)				(139,000)				(99,000)	(139,000)
Deferred loan costs	(835,000)				(1,318,000)				(835,000)	(1,318,000)
Specific reserve charge-offs	(43,000)				0				(43,000)	0
Prepaid expenses	(161,000)				(280,000)				(161,000)	(280,000)
Total deferred tax liabilities	(3,105,000)				(5,768,000)				(3,105,000)	(5,768,000)
Net deferred tax assets	2,389,000				3,298,000				2,389,000	3,298,000
Federal
Current									4,745,000	2,642,000	$ 2,847,000
Deferred									(881,000)	941,000	465,000
Total Federal Income Taxes									3,864,000	3,583,000	3,312,000
State
Current									1,388,000	28,000	10,000
Deferred									1,787,000	1,258,000	1,175,000
Total State Income Taxes									3,175,000	1,286,000	1,185,000
Total
Current									6,133,000	2,670,000	2,857,000
Deferred									906,000	2,199,000	1,640,000
Total Income Taxes	2,354,000	$ 1,840,000	$ 1,691,000	$ 1,155,000	$ 1,226,000	$ 1,282,000	$ 1,236,000	$ 1,125,000	$ 7,039,000	$ 4,869,000	$ 4,497,000
Reconciliation of the statutory federal income tax rate [Abstract]
Statutory federal income tax rate									35.00%	34.00%	34.00%
State franchise tax, net of federal income tax benefit									6.20%	6.90%	6.90%
Tax Cuts and Jobs Act impact on deferred re-measurement									6.30%	0.00%	0.00%
Other									(2.60%)	(1.20%)	(1.10%)
Total (percent)									44.90%	39.70%	39.80%
Operating Loss Carryforwards [Line Items]
Tax Cuts And Jobs Act Of 2017, provisional income tax expense									$ 986,000
Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0								0
State
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 0								$ 0

Stock Based Compensation (Detai

Stock Based Compensation (Details)	1 Months Ended	12 Months Ended
	May 31, 2005	Dec. 31, 2017USD ($)plan$ / sharesshares	Dec. 31, 2016USD ($)$ / sharesshares	Dec. 31, 2015USD ($)$ / sharesshares	Dec. 31, 2017USD ($)$ / sharesshares	Dec. 31, 2016USD ($)shares	May 31, 2015shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation plans | plan		2
Number of shares granted outstanding (in shares)		37,115	37,115		94,601	37,115
Option exercisable (percent)	20.00%
Options expiration period	10 years
Options outstanding, exercisable, exercised and forfeited [Roll Forward]
Options outstanding (in shares)		37,115
Granted (in shares)		60,000
Exercised (in shares)		2,514	2,513
Forfeited (in shares)		0
Options outstanding (in shares)		94,601	37,115
Weighted Average Exercise Price [Roll Forward]
Options outstanding (in dollars per share) | $ / shares		$ 3.83
Granted (in dollars per share) | $ / shares		10.15
Exercised (in dollars per share) | $ / shares		2.55
Forfeited (in dollars per share) | $ / shares		0
Options outstanding (in dollars per share) | $ / shares		$ 7.87	$ 3.83
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Options exercisable weighted average exercise price (in dollars per share) | $ / shares					$ 3.87
Options exercisable weighted average remaining contract term		5 years 8 months 12 days
Options exercisable intrinsic value | $					$ 189,000
Share-based compensation | $		$ 97,000	$ 30,000	$ 26,000
Unrecognized compensation expense | $				$ 48,000	418,000	$ 30,000
Cost recognized weighted average period		4 years 7 months 6 days
Share based compensation arrangement by share based payment award options grants in period grant date intrinsic value [Abstract]
Weighted average grant-date fair value of stock options granted (in dollars per share) | $ / shares		$ 7.18	$ 0	$ 0
Total fair value of stock options vested | $		$ 17,845	$ 19,650	$ 19,640
Total intrinsic value of stock options exercised | $		$ 12,383	$ 4,500	$ 0
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Non-vested awards, beginning balance (shares)		12,015	15,019	0
Granted during the year (shares)		41,917
Restricted stock units released		7,421
Canceled during the year (shares)		0
Non-vested awards, ending balance (shares)		46,511	12,015	15,019
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Non-vested awards, beginning balance (dollars per share) | $ / shares		$ 5.13
Granted during the year (dollars per share) | $ / shares		10.92
Vested during the year (dollars per share) | $ / shares		7.24
Canceled during the year (dollars per share) | $ / shares		0
Non-vested awards, ending balance (dollars per share) | $ / shares		$ 9.57	$ 5.13
Unrecognized compensation expense | $				$ 44,000	$ 439,000	$ 35,000
Cost recognized weighted average period		1 year 1 month 6 days
2005 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted outstanding (in shares)		34,601			34,601
Number of stock option vested in period (in shares)					26,565
Options outstanding, exercisable, exercised and forfeited [Roll Forward]
Granted (in shares)		0		0
Exercised (in shares)		2,514
Options outstanding (in shares)		34,601
2005 Plan | Incentive Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted outstanding (in shares)		34,601			34,601
Options outstanding, exercisable, exercised and forfeited [Roll Forward]
Granted (in shares)		0		14,290
Options outstanding (in shares)		34,601
Stock options valuation assumptions [Abstract]
Risk Free Interest Rate (percent)		1.94%	0.00%	0.00%
Expected Dividend Yield (percent)		0.00%	0.00%	0.00%
Expected Life in Years		10 years	0 years	0 years
Expected Price Volatility (percent)		62.60%	0.00%	0.00%
2005 Plan | Nonqualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted outstanding (in shares)		0			0
Options outstanding, exercisable, exercised and forfeited [Roll Forward]
Options outstanding (in shares)		0
2015 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted outstanding (in shares)							34,601
Number of shares authorized (in shares)							758,000
2015 Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted stock units released		0
Non-vested awards, ending balance (shares)		106,511
2015 Plan | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Non-vested awards, ending balance (shares)		46,511

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
401K Plan [Abstract]
Employers matching contribution vesting percentage (percent)	100.00%
Matching contributions	$ 255	$ 280	$ 240
Salary Continuation Plan [Abstract]
Life insurance premium expense	$ 49
Salary continuation contracts, service period	20 years
Salary continuation plan accrued liability	$ 4,084	$ 3,975
Discounted cash flow rate (percent)	3.04%	3.21%
Cash surrender value	$ 6,817	$ 6,452
Income on insurance	485	465	399
Unrecognized net periodic benefit costs	462	383	371
Officer Supplemental Life Insurance Plan [Abstract]
Cash surrender value of bank owned life insurance policies	12,935	12,595
Income (Loss) on Bank Owned Life Insurance Policies	$ 485	465	399
Maximum
401K Plan [Abstract]
Matching contribution (percent)	4.00%
Salary Continuation Plan
Salary Continuation Plan [Abstract]
Additional compensation benefits term	15 years
Salaries and benefits expense	$ 223	$ 137	$ 193
Salary Continuation Plan | Minimum
Salary Continuation Plan [Abstract]
Benefit plan vesting period	12 years
Salary Continuation Plan | Maximum
Salary Continuation Plan [Abstract]
Benefit plan vesting period	32 years

Commitments and Contingent Li62

Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Rent expenses, total	$ 922	$ 862	$ 782
Rental adjustments	1	8	$ 16
Future minimum rental commitments under existing non-cancelable leases [Abstract]
2,018	710
2,019	534
2,020	484
2,021	288
2,022	282
Thereafter	806
Future minimum rental commitments under existing non-cancelable leases	$ 3,104
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Minimum term of guarantees (less than one month)	1 month
Maximum term of guarantees	3 years
Commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contractual amount	$ 99,958	120,485
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contractual amount	$ 2,058	$ 1,201

Fair Value Measurements and D63

Fair Value Measurements and Disclosure (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deposits:
Junior subordinated debt	$ 9,730	$ 8,832
Quoted Prices In Active Markets for Identical Assets Level 1
Financial Assets:
Cash and cash equivalents	107,934	113,032
Investment securities	3,737	3,716
Deposits:
Noninterest-bearing	307,299	262,697
NOW and money market	234,154	235,873
Savings	81,408	75,068
Total deposits	622,861	573,638
Significant Other Observable Inputs Level 2
Financial Assets:
Interest-bearing deposits		650
Investment securities	41,985	53,775
Accrued interest receivable	6,526	3,895
Deposits:
Accrued interest payable	44	76
Significant Unobservable Inputs Level 3
Financial Assets:
Loans	588,938	557,914
Deposits:
Time deposits	64,387	102,743
Total deposits	64,387	102,743
Junior subordinated debt	9,730	8,832
Carrying Amount
Financial Assets:
Cash and cash equivalents	107,934	113,032
Interest-bearing deposits		650
Investment securities	45,722	57,491
Loans	593,123	561,932
Accrued interest receivable	6,526	3,895
Deposits:
Noninterest-bearing	307,299	262,697
NOW and money market	234,154	235,873
Savings	81,408	75,068
Time deposits	64,832	102,991
Total deposits	687,693	676,629
Junior subordinated debt	9,730	8,832
Accrued interest payable	44	76
Estimated Fair Value
Financial Assets:
Cash and cash equivalents	107,934	113,032
Interest-bearing deposits		650
Investment securities	45,722	57,491
Loans	588,938	557,914
Accrued interest receivable	6,526	3,895
Deposits:
Noninterest-bearing	307,299	262,697
NOW and money market	234,154	235,873
Savings	81,408	75,068
Time deposits	64,387	102,743
Total deposits	687,248	676,381
Junior subordinated debt	9,730	8,832
Accrued interest payable	$ 44	$ 76

Fair Value Measurements and D64

Fair Value Measurements and Disclosure, Part II (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
AFS Securities:
U.S. Government agencies	$ 19,954	$ 23,203
U.S Govt collateralized mortgage obligations	22,031	30,572
Mutual Funds	3,737	3,716
Fair Value (Carrying Amount)	45,722	57,491
Impaired Loans:
Commercial and industrial	0	301
Total impaired loans	0	301
Other real estate owned	0	0
Total	45,722	57,792
Description of Liabilities
Junior subordinated debt	9,730	8,832
Total	9,730	8,832
Impairment of Real Estate	0	0	$ 188
Quoted Prices In Active Markets for Identical Assets Level 1
AFS Securities:
U.S Govt collateralized mortgage obligations	0	0
Mutual Funds	3,737	3,716
Fair Value (Carrying Amount)	3,737	3,716
Impaired Loans:
Total	3,737	3,716
Description of Liabilities
Total	0	0
Significant Other Observable Inputs Level 2
AFS Securities:
U.S. Government agencies	19,954	23,203
U.S Govt collateralized mortgage obligations	22,031	30,572
Fair Value (Carrying Amount)	41,985	53,775
Impaired Loans:
Total	41,985	53,775
Description of Liabilities
Total	0	0
Significant Unobservable Inputs Level 3
Impaired Loans:
Commercial and industrial	0	301
Total impaired loans	0	301
Other real estate owned	0	0
Total	0	301
Description of Liabilities
Junior subordinated debt	9,730	8,832
Total	$ 9,730	$ 8,832

Fair Value Measurements and D65

Fair Value Measurements and Disclosure, Part III (Details) - Significant Unobservable Inputs Level 3 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Discounted Cash Flow Valuation Technique | Junior Subordinated Debt
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average inputs (percent)	5.81%	6.46%
Mortgages | Sales Comparison Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average inputs (percent)		19.10%
Mortgages | Minimum | Sales Comparison Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average inputs (percent)		7.00%
Mortgages | Maximum | Sales Comparison Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average inputs (percent)		29.00%
Fair Value, Measurements, Nonrecurring | Mortgages | Sales Comparison Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Real estate mortgage		$ 301

Fair Value Measurements and D66

Fair Value Measurements and Disclosure, Part IV (Details) - Junior Subordinated Debt - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Liabilities:
Beginning balance	$ 8,832	$ 8,300	$ 10,115
Total losses included in earnings	882	518	73
Canceled debt	0	0	(1,122)
Gain on redemption of liability	0	0	78
Capitalized interest	16	1,050	(698)
Ending balance	9,730	8,832	8,300
The amount of total losses for the period included in earnings attributable to the change in unrealized gains or losses relating to liabilities still held at the reporting date	$ 882	$ 518	$ 73

Regulatory Matters (Details)

Regulatory Matters (Details) - USD ($)	1 Months Ended		12 Months Ended
	Sep. 30, 2015	Jul. 31, 2007	Dec. 31, 2017	Dec. 31, 2015	Jan. 01, 2019	Dec. 31, 2016	Jan. 01, 2016	Jul. 31, 2013	Sep. 30, 2009
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Minimum tier 1 capital to total assets ratio (percent)			3.00%
Capital [Abstract]
Total Capital (to Risk Weighted Assets) Actual			$ 115,265,000	$ 100,659,000		$ 108,868,000
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes			52,560,000	48,358,000		50,454,000
Tier One Risk Based Capital [Abstract]
Tier 1 Capital (to Risk Weighted Assets) Actual			107,043,000	93,073,000		100,968,000
Tier 1 Capital (to Risk Weighted Assets) For Capital Adequacy Purposes			39,420,000	36,269,000		37,840,000
Tier one Common Equity [Abstract]
Tier One Common Equity			97,313,000	85,237,000		92,600,000
Tier One Common Capital Required for Capital Adequacy			29,565,000	27,201,000		30,630,000
Tier One Leverage Capital [Abstract]
Tier 1 Capital (to Average Assets) Actual			107,043,000	93,073,000		100,968,000
Tier 1 Capital (to Average Assets) For Capital Adequacy Purposes			$ 32,899,000	$ 28,747,000		$ 30,956,000
Risk Based Ratios [Abstract]
Total Capital (to Risk Weighted Assets) Actual (percent)			17.54%	16.65%		17.26%
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes (percent)			8.00%	8.00%		8.00%
Tier One Risk Based Ratios [Abstract]
Tier 1 Capital (to Risk Weighted Assets) Actual (percent)			16.29%	15.40%		16.01%
Tier 1 Capital (to Risk Weighted Assets) For Capital Adequacy Purposes (percent)			6.00%	6.00%		6.00%
Tier One Common Equity Risk Based Ratios [Abstract]
Tier One Common Capital to Risk Weighted Assets (percent)			14.81%	14.10%		14.68%
Tier One Common Capital Required for Capital Adequacy to Risk Weighted Assets (percent)			4.50%	4.50%		4.50%
Leverage Ratios [Abstract]
Tier 1 Capital (to Average Assets) Actual (in hundredths)			13.01%	12.95%		12.97%
Tier 1 Capital (to Average Assets) For Capital Adequacy Purposes (in hundredths)			4.00%	4.00%		4.00%
Tier 2 Capital (to Risk Weighted Assets) for Capital Adequacy Purposes (percent)			1.25%
Tier 2 Capital (to Risk Weighted Assets) for Capital Adequacy Purposes, Percent unrealized gains on AFS equity securities			45.00%
Tier 1 capital conservation buffer							0.625%
Amount issued in trust preferred securities		$ 15,000,000	$ 12,000,000					$ 15,000,000
Maximum qualified percentage (in hundredths)		25.00%
Dividends received			4,291,000
Junior Subordinated Debt
Leverage Ratios [Abstract]
Amount issued in trust preferred securities			$ 12,000,000						$ 15,000,000
Amount of debt canceled	$ 3,000,000			$ 3,000,000
Minimum
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Addition to leverage ratio			1.00%
Maximum
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Addition to leverage ratio			2.00%
Bank
Capital [Abstract]
Total Capital (to Risk Weighted Assets) Actual			$ 113,653,000	100,544,000		$ 108,400,000
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes			52,511,000	48,204,000		50,454,000
Total Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions			65,638,000	71,870,000		63,068,000
Tier One Risk Based Capital [Abstract]
Tier 1 Capital (to Risk Weighted Assets) Actual			105,431,000	92,981,000		100,500,000
Tier 1 Capital (to Risk Weighted Assets) For Capital Adequacy Purposes			39,383,000	36,153,000		37,840,000
Tier 1 Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions			52,511,000	57,496,000		50,454,000
Tier one Common Equity [Abstract]
Tier One Common Equity			105,431,000	92,981,000		100,500,000
Tier One Common Capital Required for Capital Adequacy			29,537,000	27,115,000		30,630,000
Tier One Common Capital Required to be Well Capitalized			42,665,000	46,716,000		40,994,000
Tier One Leverage Capital [Abstract]
Tier 1 Capital (to Average Assets) Actual			105,431,000	92,981,000		100,500,000
Tier 1 Capital (to Average Assets) For Capital Adequacy Purposes			32,732,000	28,748,000		30,956,000
Tier 1 Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions			$ 40,865,000	$ 35,935,000		$ 38,695,000
Risk Based Ratios [Abstract]
Total Capital (to Risk Weighted Assets) Actual (percent)			17.31%	16.69%		17.19%
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes (percent)			8.00%	8.00%		8.00%
Total Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions (percent)			10.00%	10.00%		10.00%
Tier One Risk Based Ratios [Abstract]
Tier 1 Capital (to Risk Weighted Assets) Actual (percent)			16.06%	15.43%		15.94%
Tier 1 Capital (to Risk Weighted Assets) For Capital Adequacy Purposes (percent)			6.00%	6.00%		6.00%
Tier 1 Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions (percent)			8.00%	8.00%		8.00%
Tier One Common Equity Risk Based Ratios [Abstract]
Tier One Common Capital to Risk Weighted Assets (percent)			16.06%	15.43%		15.94%
Tier One Common Capital Required for Capital Adequacy to Risk Weighted Assets (percent)			4.50%	4.50%		4.50%
Tier One Common Capital Required to be Well Capitalized to Risk Weighted Assets (percent)			6.50%	6.50%		6.50%
Leverage Ratios [Abstract]
Tier 1 Capital (to Average Assets) Actual (in hundredths)			12.90%	12.94%		12.99%
Tier 1 Capital (to Average Assets) For Capital Adequacy Purposes (in hundredths)			4.00%	4.00%		4.00%
Tier 1 Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions (in hundredths)			5.00%	5.00%		5.00%
Scenario, forecast
Leverage Ratios [Abstract]
Tier 1 capital conservation buffer					2.50%
Cash and U.S. Government Securities
Leverage Ratios [Abstract]
Risk weighted factor			0.00%
Residential Mortgages
Leverage Ratios [Abstract]
Risk weighted factor			50.00%
Commercial and Consumer Loans
Leverage Ratios [Abstract]
Risk weighted factor			100.00%
Past Due Loans
Leverage Ratios [Abstract]
Risk weighted factor			150.00%
Equity interests | Minimum
Leverage Ratios [Abstract]
Risk weighted factor			0.00%
Equity interests | Maximum
Leverage Ratios [Abstract]
Risk weighted factor			600.00%

Supplemental Cash Flow Disclo68

Supplemental Cash Flow Disclosures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash paid during the period for:
Interest	$ 1,762	$ 1,362	$ 1,243
Income Taxes	6,863	1,710	3,080
Noncash activities:
Loans transferred to foreclosed property	0	0	226
OREO financed	0	3,766	0
Unrealized holdings gains (losses) on securities	16	(648)	(265)
Unrealized losses on unrecognized post retirement costs	$ (6)	$ (22)	$ 224

Dividends on Common Stock (Deta

Dividends on Common Stock (Details) - USD ($)	Dec. 19, 2017	Sep. 26, 2017	Jun. 27, 2017	Apr. 25, 2017	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Common Stock Dividend [Abstract]
Percentage of stock dividend declared on common stocks outstanding (percent)					1.00%	1.00%	1.00%	1.00%	1.00%	1.00%	1.00%	1.00%
Dividends declared on common stock (in dollars per share)	$ 0.07		$ 0.05	$ 0.05
Dividends on common stock	$ 1,182,000	$ 1,182,000	$ 844,000	$ 844,000									$ 2,870,000	$ 0	$ 0
Authorized repurchase amount, common stock				$ 3,000,000

Net Income Per Share (Details)

Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income available to common shareholders									$ 8,640	$ 7,385	$ 6,810
Weighted average shares outstanding (shares)									16,885,587	16,881,379	16,880,563
Add: dilutive effect of stock options (shares)									19,328	7,648	2,234
Weighted average shares outstanding adjusted for potential dilution (shares)									16,904,915	16,889,027	16,882,797
Basic (loss) earnings per share (dollars per share)	$ 0.10	$ 0.16	$ 0.15	$ 0.10	$ 0.09	$ 0.12	$ 0.12	$ 0.10	$ 0.51	$ 0.44	$ 0.40
Diluted (loss) earnings per share (dollars per share)	$ 0.10	$ 0.16	$ 0.15	$ 0.10	$ 0.09	$ 0.12	$ 0.12	$ 0.10	$ 0.51	$ 0.44	$ 0.40
Anti-dilutive shares excluded from earnings per share calculation (shares)									98,000	21,000	132,000

Common Stock Repurchase Plan (D

Common Stock Repurchase Plan (Details) - USD ($)	Dec. 31, 2017	Apr. 25, 2017	May 16, 2007
Common Stock Repurchase Plan [Abstract]
Shares authorized to be repurchased (shares)			846,127
Repurchase plan percentage of common stock outstanding (percent)			5.00%
Number of shares available for repurchase (shares)	732,556
Repurchase plan, authorized amount		$ 3,000,000

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 4,488	$ 4,488

Parent Company Only Financial73

Parent Company Only Financial Statements (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Assets
Cash and equivalents	$ 107,934	$ 113,032	$ 125,751	$ 103,577
Investment in bank subsidiary	1,601	757
Other assets	8,391	6,466
Total assets	805,836	787,972
Liabilities
Junior subordinated debt securities (at fair value)	9,730	8,832
Total liabilities	704,484	691,318
Shareholders' Equity
Common stock, no par value 20,000,000 shares authorized, 16,885,615 and 16,705,594 issued and outstanding, at December 31, 2017 and December 31, 2016, respectively	57,880	56,557
Retained earnings	44,182	40,701
Accumulated other comprehensive loss	(710)	(604)
Total shareholders' equity	101,352	96,654	89,635	82,826
Total liabilities and shareholders' equity	$ 805,836	$ 787,972
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares issued (in shares)	16,885,615	16,051,406
Common stock, shares outstanding (in shares)	16,885,615	16,051,406
Parent Company
Assets
Cash and equivalents	$ 1,656	$ 148	$ 140	$ 224
Investment in bank subsidiary	109,472	104,554
Other assets	1,136	2,525
Total assets	112,264	107,227
Liabilities
Junior subordinated debt securities (at fair value)	9,730	8,832
Deferred taxes	0	1,741
Dividends declared	1,182	0
Total liabilities	10,912	10,573
Shareholders' Equity
Common stock, no par value 20,000,000 shares authorized, 16,885,615 and 16,705,594 issued and outstanding, at December 31, 2017 and December 31, 2016, respectively	57,880	56,557
Retained earnings	44,182	40,701
Accumulated other comprehensive loss	(710)	(604)
Total shareholders' equity	101,352	96,654
Total liabilities and shareholders' equity	$ 112,264	$ 107,227
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares issued (in shares)	16,885,615	16,705,594
Common stock, shares outstanding (in shares)	16,885,615	16,705,594

Parent Company Only Financial74

Parent Company Only Financial Statements II (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income
Gain on redemption of JR subordinated debentures									$ 0	$ 0	$ 78
Expense
Interest expense	$ 451	$ 435	$ 438	$ 405	$ 395	$ 349	$ 330	$ 335	1,730	1,409	1,281
Other expense									2,537	2,382	2,444
Income (loss) before taxes and equity in undistributed income of subsidiary	3,991	4,580	4,183	2,926	2,781	3,322	3,257	2,894	15,679	12,254	11,307
Income tax benefit	2,354	1,840	1,691	1,155	1,226	1,282	1,236	1,125	7,039	4,869	4,497
Net Income	$ 1,637	$ 2,740	$ 2,492	$ 1,771	$ 1,555	$ 2,040	$ 2,021	$ 1,769	8,640	7,385	6,810
Parent Company
Income
Loss on fair value of financial liability									(882)	(518)	(73)
Gain on redemption of JR subordinated debentures									0	0	78
Dividends from subsidiary									4,291	424	2,416
Total income									3,409	(94)	2,421
Expense
Interest expense									302	240	225
Other expense									269	241	256
Total expense									571	481	481
Income (loss) before taxes and equity in undistributed income of subsidiary									2,838	(575)	1,940
Income tax benefit									(989)	(411)	(196)
Undistributed income of subsidiary									4,813	7,549	4,674
Net Income									$ 8,640	$ 7,385	$ 6,810

Parent Company Only Financial75

Parent Company Only Financial Statements III (Details) - USD ($) $ in Thousands	Dec. 19, 2017	Sep. 26, 2017	Jun. 27, 2017	Apr. 25, 2017	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash Flows From Operating Activities:
Net Income					$ 1,637	$ 2,740	$ 2,492	$ 1,771	$ 1,555	$ 2,040	$ 2,021	$ 1,769	$ 8,640	$ 7,385	$ 6,810
Adjustments to reconcile net income to cash provided by operating activities:
Provision for deferred income taxes													906	2,199	1,640
Gain on redemption of JR subordinated debentures													0	0	(78)
Net cash provided by operating activities													7,555	9,458	9,264
Cash Flows From Financing Activities:
Proceeds from exercise of stock options													6	6	0
Cash dividend	$ (1,182)	$ (1,182)	$ (844)	$ (844)									(2,870)	0	0
Redemption of junior subordinated debenture													0	0	1,800
Net cash provided by financing activities													8,203	54,830	54,632
Net increase (decrease) increase in cash and cash equivalents													(5,098)	(12,719)	22,174
Cash and cash equivalents at beginning of year								113,032				125,751	113,032	125,751	103,577
Cash and cash equivalents at end of year					107,934				113,032				107,934	113,032	125,751
Parent Company
Cash Flows From Operating Activities:
Net Income													8,640	7,385	6,810
Adjustments to reconcile net income to cash provided by operating activities:
Equity in undistributed income of subsidiary													(4,813)	(7,549)	(4,674)
Provision for deferred income taxes													(751)	(169)	(518)
Loss on fair value option of financial liability													882	518	73
Gain on redemption of JR subordinated debentures													0	0	(78)
Decrease (increase) in income tax receivable													391	(198)	117
Net change in other assets/liabilities													23	15	(14)
Net cash provided by operating activities													4,372	2	1,716
Cash Flows From Financing Activities:
Proceeds from exercise of stock options													6	6	0
Redemption of junior subordinated debenture													0	0	(1,800)
Net cash provided by financing activities													(2,864)	6	(1,800)
Net increase (decrease) increase in cash and cash equivalents													1,508	8	(84)
Cash and cash equivalents at beginning of year								$ 148				$ 140	148	140	224
Cash and cash equivalents at end of year					$ 1,656				$ 148				$ 1,656	$ 148	$ 140

Summary of Quarterly Results 76

Summary of Quarterly Results of Operation (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Loans, including fees	$ 8,035	$ 7,978	$ 7,579	$ 7,225	$ 7,460	$ 7,435	$ 6,658	$ 6,631	$ 30,817	$ 28,182	$ 26,469
Interest Income, Operating	560	614	531	408	319	318	338	315
Total interest income	8,595	8,592	8,110	7,633	7,779	7,753	6,996	6,946	32,930	29,473	27,410
Total interest expense	451	435	438	405	395	349	330	335	1,730	1,409	1,281
Net Interest Income Before Recovery of Provision for Credit Losses	8,144	8,157	7,672	7,228	7,384	7,404	6,666	6,611	31,200	28,064	26,129
Provision (recovery of provision) for credit losses	48	7	(52)	21	(14)	4	12	(22)	24	(21)	(41)
Net Interest Income after Provision for Credit Losses	8,096	8,150	7,724	7,207	7,398	7,400	6,654	6,633	31,176	28,085	26,170
Total noninterest income	1,155	1,176	1,066	909	741	786	1,427	1,561	4,306	4,514	4,735
Total noninterest expense	5,260	4,746	4,607	5,190	5,358	4,864	4,824	5,300	19,803	20,345	19,598
Income Before Provision for Taxes	3,991	4,580	4,183	2,926	2,781	3,322	3,257	2,894	15,679	12,254	11,307
Provision for Taxes on Income	2,354	1,840	1,691	1,155	1,226	1,282	1,236	1,125	7,039	4,869	4,497
Net Income	$ 1,637	$ 2,740	$ 2,492	$ 1,771	$ 1,555	$ 2,040	$ 2,021	$ 1,769	$ 8,640	$ 7,385	$ 6,810
Basic (dollars per share)	$ 0.10	$ 0.16	$ 0.15	$ 0.10	$ 0.09	$ 0.12	$ 0.12	$ 0.10	$ 0.51	$ 0.44	$ 0.40
Diluted (dollars per share)	$ 0.10	$ 0.16	$ 0.15	$ 0.10	$ 0.09	$ 0.12	$ 0.12	$ 0.10	$ 0.51	$ 0.44	$ 0.40