Farmers & Merchants Bancorp (FMCB) 10-K 16 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	FARMERS & MERCHANTS BANCORP
Entity Central Index Key	1,085,913
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			$ 501,396,000
Entity Common Stock, Shares Outstanding		812,304
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
Cash and Cash Equivalents:
Cash and Due from Banks	$ 65,956	$ 54,896
Interest Bearing Deposits with Banks	121,193	43,964
Total Cash and Cash Equivalents	187,149	98,860
Investment Securities:
Available-for-Sale	481,596	448,263
Held-to-Maturity	54,460	58,109
Total Investment Securities	536,056	506,372
Loans & Leases:	2,215,295	2,177,601
Less: Allowance for Credit Losses	50,342	47,919
Loans & Leases, Net	2,164,953	2,129,682
Premises and Equipment, Net	28,679	29,229
Bank Owned Life Insurance	59,583	57,761
Interest Receivable and Other Assets	99,032	100,217
Total Assets	3,075,452	2,922,121
Deposits:
Demand	832,652	756,236
Interest-Bearing Transaction	601,476	495,063
Savings and Money Market	813,703	760,119
Time	475,397	570,293
Total Deposits	2,723,228	2,581,711
Subordinated Debentures	10,310	10,310
Interest Payable and Other Liabilities	42,254	50,119
Total Liabilities	2,775,792	2,642,140
Commitments & Contingencies (See Note 20)
Shareholders' Equity
Preferred Stock: No Par Value, 1,000,000 Shares Authorized, None Issued or Outstanding	0	0
Common Stock: Par Value $0.01, 7,500,000 Shares Authorized, 812,304 and 807,329 Shares Issued and Outstanding at December 31, 2017 and 2016, respectively.	8	8
Additional Paid-In Capital	93,624	90,671
Retained Earnings	206,845	189,313
Accumulated Other Comprehensive Income	(817)	(11)
Total Shareholders' Equity	299,660	279,981
Total Liabilities and Shareholders' Equity	$ 3,075,452	$ 2,922,121

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Shareholders' Equity
Preferred Stock, par value (in dollars per share)	$ 0	$ 0
Preferred Stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred Stock, shares issued (in shares)	0	0
Preferred Stock, shares outstanding (in shares)	0	0
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	7,500,000	7,500,000
Common Stock, shares issued (in shares)	812,304	807,329
Common Stock, shares outstanding (in shares)	812,304	807,329

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
Interest and Fees on Loans & Leases	$ 102,682	$ 91,570	$ 81,558
Interest on Deposits with Banks	2,060	287	172
Interest on Investment Securities:
Taxable	8,123	5,505	6,311
Exempt from Federal Tax	1,747	1,904	2,034
Total Interest Income	114,612	99,266	90,075
Interest Expense
Deposits	5,865	3,807	2,989
Borrowed Funds	0	18	7
Subordinated Debentures	424	371	329
Total Interest Expense	6,289	4,196	3,325
Net Interest Income	108,323	95,070	86,750
Provision for Credit Losses	2,850	6,335	750
Net Interest Income After Provision for Credit Losses	105,473	88,735	86,000
Non-Interest Income
Service Charges on Deposit Accounts	3,453	3,376	3,458
Net Gain (Loss) on Investment Securities	131	(284)	275
Increase in Cash Surrender Value of Life Insurance	1,822	1,864	1,908
Debit Card and ATM Fees	3,873	3,398	3,183
Net Gain on Deferred Compensation Investments	2,563	1,999	1,375
Bargain Purchase Gain	0	1,832	0
Other	4,920	3,072	4,376
Total Non-Interest Income	16,762	15,257	14,575
Non-Interest Expense
Salaries and Employee Benefits	45,746	41,981	39,683
Net Gain on Deferred Compensation Investments	2,563	1,999	1,375
Occupancy	3,543	2,985	2,884
Equipment	3,994	3,493	3,162
Marketing	1,027	1,191	1,254
Legal	424	1,243	421
FDIC Insurance	932	1,174	1,193
Gain on Sale of ORE	(414)	(5,941)	(299)
Other	9,939	10,047	6,586
Total Non-Interest Expense	67,754	58,172	56,259
Income Before Income Taxes	54,481	45,820	44,316
Provision for Income Taxes	26,111	16,097	16,924
Net Income	$ 28,370	$ 29,723	$ 27,392
Basic Earnings Per Common Share (in dollars per share)	$ 35.03	$ 37.44	$ 34.82

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Consolidated Statements of Comprehensive Income [Abstract]
Net Income	$ 28,370	$ 29,723	$ 27,392
Other Comprehensive Loss
Net Unrealized Loss on Available-for-Sale Securities	(1,011)	(1,330)	(3,069)
Deferred Tax Benefit Related to Unrealized Losses	281	559	1,290
Reclassification Adjustment for Realized (Gain) Loss on Available-for-Sale Securities Included in Net Income	(131)	284	(275)
Tax Expense (Benefit) Related to Reclassification Adjustment	55	(119)	116
Change in Net Unrealized Loss on Available-for-Sale Securities, Net of Tax	(806)	(606)	(1,938)
Total Other Comprehensive Loss	(806)	(606)	(1,938)
Comprehensive Income	$ 27,564	$ 29,117	$ 25,454

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Total
Balance at Dec. 31, 2014	$ 8	$ 77,804	$ 152,833	$ 2,533	$ 233,178
Balance (in shares) at Dec. 31, 2014	784,082
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income			27,392		27,392
Cash Dividends Declared on Common Stock			(10,157)		(10,157)
Issuance of Common Stock		3,360			3,360
Issuance of Common Stock (in shares)	6,705
Change in Net Unrealized (Loss) Gain on Securities Available-for-Sale				(1,938)	(1,938)
Balance at Dec. 31, 2015	$ 8	81,164	170,068	595	251,835
Balance (in shares) at Dec. 31, 2015	790,787
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income			29,723		29,723
Cash Dividends Declared on Common Stock			(10,478)		(10,478)
Issuance of Common Stock		9,507			$ 9,507
Issuance of Common Stock (in shares)	16,542				16,542
Change in Net Unrealized (Loss) Gain on Securities Available-for-Sale				(606)	$ (606)
Balance at Dec. 31, 2016	$ 8	90,671	189,313	(11)	$ 279,981
Balance (in shares) at Dec. 31, 2016	807,329				807,329
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income			28,370		$ 28,370
Cash Dividends Declared on Common Stock			(10,982)		(10,982)
Issuance of Common Stock		2,953			$ 2,953
Issuance of Common Stock (in shares)	4,975				4,975
Tax Adjustment of Available-for-Sale Securities Reclassed from AOCI			144	(144)	$ 0
Change in Net Unrealized (Loss) Gain on Securities Available-for-Sale				(662)	(662)
Balance at Dec. 31, 2017	$ 8	$ 93,624	$ 206,845	$ (817)	$ 299,660
Balance (in shares) at Dec. 31, 2017	812,304				812,304

Consolidated Statements of Cha7

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash Dividends Declared per Share of Common Stock (in dollars per share)	$ 13.55	$ 13.10	$ 12.90

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Activities
Net Income	$ 28,370	$ 29,723	$ 27,392
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Provision for Credit Losses	2,850	6,335	750
Depreciation and Amortization	2,186	1,896	1,685
Provision for Deferred Income Taxes	12,605	(2,299)	(907)
Net Amortization of Investment Security Premium & Discounts	1,430	1,481	1,554
Amortization of Core Deposit Intangible	110	13	0
Accretion of Discount on Acquired Loans	(202)	(43)	0
Net (Gain) Loss on Investment Securities	(131)	284	(275)
Net (Gain) Loss on Sale of Property & Equipment	(1,189)	71	(383)
Net Gain on Sale of ORE	(414)	(5,941)	(299)
Net Gain from Acquisition	0	(1,832)	0
Net Change in Operating Assets & Liabilities:
Net (Increase) Decrease in Interest Receivable and Other Assets	(275)	1,056	4,685
Net (Decrease) Increase in Interest Payable and Other Liabilities	(5,396)	4,068	3,125
Net Cash Provided by Operating Activities	39,944	34,812	37,327
Investing Activities
Purchase of Investment Securities Available-for-Sale	(325,573)	(497,797)	(203,996)
Proceeds from Sold, Matured, or Called Securities Available-for-Sale	289,857	426,142	227,157
Purchase of Investment Securities Held-to-Maturity	(1,205)	(2,264)	(17,747)
Proceeds from Matured, or Called Securities Held-to-Maturity	4,794	5,499	18,031
Net Loans & Leases Paid, Originated or Acquired	(38,178)	(148,960)	(284,211)
Principal Collected on Loans & Leases Previously Charged Off	259	232	5,468
Cash Acquired in Acquisition, Net of Cash Paid	0	31,751	0
Additions to Premises and Equipment	(4,254)	(1,504)	(2,726)
Purchase of Other Investment	(14,380)	(6,825)	(2,110)
Proceeds from Sale of Property & Equipment	3,304	0	670
Proceeds from Sale of ORE	3,186	8,282	1,156
Net Cash Used in Investing Activities	(82,190)	(185,444)	(258,308)
Financing Activities
Net Increase in Deposits	141,517	200,524	213,459
Cash Dividends	(10,982)	(10,478)	(10,157)
Net Cash Provided by (Used in) Financing Activities	130,535	190,046	203,302
Increase (Decrease) in Cash and Cash Equivalents	88,289	39,414	(17,679)
Cash and Cash Equivalents at Beginning of Year	98,860	59,446	77,125
Cash and Cash Equivalents at End of Year	187,149	98,860	59,446
Supplementary Data
Loans Transferred to Foreclosed Assets (ORE)	0	538	0
Cash Payments Made for Income Taxes	13,942	12,891	8,475
Issuance of Common Stock to the Bank's Non-Qualified Retirement Plans	2,953	2,586	3,360
Interest Paid	6,005	3,856	3,190
Acquisitions:
Fair Value of Assets Acquired	0	114,871	0
Fair Value of Liabilities Acquired	0	103,861	0
Issuance of Common Stock to Acquired Bank's Shareholders	$ 0	$ 6,921	$ 0

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Significant Accounting Policies [Abstract]
Significant Accounting Policies	1. Significant Accounting Policies Farmers & Merchants Bancorp (the “Company”) was organized March 10, 1999. Primary operations are related to traditional banking activities through its subsidiary Farmers & Merchants Bank of Central California (the “Bank”) which was established in 1916. The Bank’s wholly owned subsidiaries include Farmers & Merchants Investment Corporation and Farmers/Merchants Corp. Farmers & Merchants Investment Corporation has been dormant since 1991. Farmers/Merchants Corp. acts as trustee on deeds of trust originated by the Bank. The Company’s other subsidiaries include F & M Bancorp, Inc. and FMCB Statutory Trust I. F & M Bancorp, Inc. was created in March 2002 to protect the name F & M Bank. During 2002, the Company completed a fictitious name filing in California to begin using the streamlined name “F & M Bank” as part of a larger effort to enhance the Company’s image and build brand name recognition. In December 2003, the Company formed a wholly owned subsidiary, FMCB Statutory Trust I, for the sole purpose of issuing Trust Preferred Securities and related subordinated debentures, in accordance with generally accepted accounting principles in the United States (“U.S. GAAP”). FMCB Statutory Trust I is a non-consolidated subsidiary. On November 18, 2016, Farmers & Merchants Bancorp completed the acquisition of Delta National Bancorp, headquartered in Manteca, California, and the parent holding company for Delta Bank N.A., a locally owned and operated community bank established in 1973. As of the acquisition date, Delta National Bancorp had approximately $112 million in assets and four branch locations in the communities of Manteca, Riverbank, Modesto and Turlock. At the effective time of the acquisition, Delta National Bancorp was merged into Farmers & Merchants Bancorp and Delta Bank, N.A. was merged into Farmers & Merchants Bank of Central California. The accounting and reporting policies of the Company conform to U.S. GAAP and prevailing practice within the banking industry. The following is a summary of the significant accounting and reporting policies used in preparing the consolidated financial statements. Basis of Presentation The accompanying consolidated financial statements and notes thereto have been prepared in accordance with accounting principles generally accepted in the United States of America for financial information. The accompanying consolidated financial statements include the accounts of the Company and the Company’s wholly owned subsidiaries, F & M Bancorp, Inc. and the Bank, along with the Bank’s wholly owned subsidiaries, Farmers & Merchants Investment Corporation and Farmers/Merchants Corp. Significant inter-company transactions have been eliminated in consolidation. The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates. Certain amounts in the prior years' financial statements and related footnote disclosures have been reclassified to conform to the current-year presentation. These reclassifications had no effect on previously reported net income or total shareholders’ equity. Cash and Cash Equivalents For purposes of the Consolidated Statements of Cash Flows, the Company has defined cash and cash equivalents as those amounts included in the balance sheet captions Cash and Due from Banks, Interest Bearing Deposits with Banks, Federal Funds Sold and Securities Purchased Under Agreements to Resell. For these instruments, the carrying amount is a reasonable estimate of fair value. Investment Securities Investment securities are classified at the time of purchase as held-to-maturity (“HTM”) if it is management’s intent and the Company has the ability to hold the securities until maturity. These securities are carried at cost, adjusted for amortization of premium and accretion of discount using a level yield of interest over the estimated remaining period until maturity. Losses, reflecting a decline in value judged by the Company to be other than temporary, are recognized in the period in which they occur. Securities are classified as available-for-sale (“AFS”) if it is management’s intent, at the time of purchase, to hold the securities for an indefinite period of time and/or to use the securities as part of the Company’s asset/liability management strategy. These securities are reported at fair value with aggregate unrealized gains or losses excluded from income and included as a separate component of shareholders’ equity, net of related income taxes. Fair values are based on quoted market prices or broker/dealer price quotations on a specific identification basis. Gains or losses on the sale of these securities are computed using the specific identification method. Trading securities, if any, are acquired for short-term appreciation and are recorded in a trading portfolio and are carried at fair value, with unrealized gains and losses recorded in non-interest income. Management evaluates securities for other-than-temporary impairment (“OTTI”) on at least a quarterly basis, and more frequently when economic or market conditions warrant such an evaluation. For securities in an unrealized loss position, management considers the extent and duration of the unrealized loss, and the financial condition and near-term prospects of the issuer. 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 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 & Leases Loans & leases are reported at the principal amount outstanding net of unearned discounts and deferred loan & lease fees and costs. Interest income on loans & leases is accrued daily on the outstanding balances using the simple interest method. Loan & lease origination fees are deferred and recognized over the contractual life of the loan or lease as an adjustment to the yield. Loans & leases are placed on non-accrual status when the collection of principal or interest is in doubt or when they become past due for 90 days or more unless they are both well-secured and in the process of collection. For this purpose, a loan or lease is considered well-secured if it is collateralized by property having a net realizable value in excess of the amount of the loan or lease or is guaranteed by a financially capable party. When a loan or lease is placed on non-accrual status, the accrued and unpaid interest receivable is reversed and charged against current income; thereafter, interest income is recognized only as it is collected in cash. Additionally, cash would be applied to principal if all principal was not expected to be collected. Loans & leases placed on non-accrual status are returned to accrual status when the loans or leases are paid current as to principal and interest and future payments are expected to be made in accordance with the contractual terms of the loan or lease. A loan or lease 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 original agreement. Impaired loans & leases are either: (1) non-accrual loans & leases; or (2) restructured loans & leases that are still accruing interest. Loans or leases determined to be impaired are individually evaluated for impairment. When a loan or lease is impaired, the Company measures impairment based on the present value of expected future cash flows discounted at the loan or lease's effective interest rate, except that as a practical expedient, it may measure impairment based on a loan or lease's observable market price, or the fair value of the collateral if the loan or lease is collateral dependent. A loan or lease is collateral dependent if the repayment of the loan or lease is expected to be provided solely by the underlying collateral. A restructuring of a loan or lease constitutes a troubled debt restructuring (TDR) if the Company for economic or legal reasons related to the borrower’s (the term “borrower” is used herein to describe a customer who has entered into either a loan or lease transaction) financial difficulties grants a concession to the borrower that it would not otherwise consider. Restructured loans & leases typically present an elevated level of credit risk as the borrowers are not able to perform according to the original contractual terms. If the restructured loan or lease was current on all payments at the time of restructure and management reasonably expects the borrower will continue to perform after the restructure, management may keep the loan or lease on accrual. Loans & leases that are on nonaccrual status at the time they become TDR, remain on nonaccrual status until the borrower demonstrates a sustained period of performance, which the Company generally believes to be six consecutive months of payments, or equivalent. A loan or lease can be removed from TDR status if it was restructured at a market rate in a prior calendar year and is currently in compliance with its modified terms. However, these loans or leases continue to be classified as impaired and are individually evaluated for impairment as described above. Generally, the Company will not restructure loans or leases for borrowers unless: (1) the existing loan or lease is brought current as to principal and interest payments; and (2) the restructured loan or lease can be underwritten to reasonable underwriting standards. If these standards are not met other actions will be pursued (e.g., foreclosure) to collect outstanding loan or lease amounts. After restructure, a determination is made whether the loan or lease will be kept on accrual status based upon the underwriting and historical performance of the restructured credit. Allowance for Credit Losses The allowance for credit losses is an estimate of probable incurred credit losses inherent in the Company's loan & lease portfolio as of the balance sheet date. The allowance is established through a provision for credit losses, which is charged to expense. Additions to the allowance are expected to maintain the adequacy of the total allowance after credit losses and loan & lease growth. Credit exposures determined to be uncollectible are charged against the allowance. Cash received on previously charged off amounts is recorded as a recovery to the allowance. The overall allowance consists of three primary components: specific reserves related to impaired loans & leases; general reserves for inherent losses related to loans & leases that are not impaired; and an unallocated component that takes into account the imprecision in estimating and allocating allowance balances associated with macro factors. The determination of the general reserve for loans & leases that are collectively evaluated for impairment is based on estimates made by management, to include, but not limited to, consideration of historical losses by portfolio segment, internal asset classifications, qualitative factors that include economic trends in the Company's service areas, industry experience and trends, geographic concentrations, estimated collateral values, the Company's underwriting policies, the character of the loan & lease portfolio, and probable losses inherent in the portfolio taken as a whole. The Company maintains a separate allowance for each portfolio segment (loan & lease type). These portfolio segments include: (1) commercial real estate; (2) agricultural real estate; (3) real estate construction (including land and development loans); (4) residential 1 st The Company assigns a risk rating to all loans & leases and periodically performs detailed reviews of all such loans & leases over a certain threshold to identify credit risks and assess overall collectability. For smaller balance loans & leases, such as consumer and residential real estate, a credit grade is established at inception, and then updated only when the loan or lease becomes contractually delinquent or when the borrower requests a modification. For larger balance loans, management monitors and analyzes the financial condition of borrowers and guarantors, trends in the industries in which borrowers operate and the fair values of collateral securing these loans & leases. These credit quality indicators are used to assign a risk rating to each individual loan or lease. These risk ratings are also subject to examination by independent specialists engaged by the Company. The risk ratings can be grouped into five major categories, defined as follows: Pass – A pass loan or lease is a strong credit with no existing or known potential weaknesses deserving of management's close attention. Special Mention – A special mention loan or lease has potential weaknesses that deserve management's close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or lease or in the Company's credit position at some future date. Special mention loans & leases are not adversely classified and do not expose the Company to sufficient risk to warrant adverse classification. Substandard – A substandard loan or lease is not adequately protected by the current financial condition and paying capacity of the borrower or the value of the collateral pledged, if any. Loans or leases classified as substandard have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. Well-defined weaknesses include a project's lack of marketability, inadequate cash flow or collateral support, failure to complete construction on time or the project's failure to fulfill economic expectations. Doubtful – Loss – Loans or leases classified as loss are considered uncollectible. Once a loan or lease becomes delinquent and repayment becomes questionable, the Company will address collateral shortfalls with the borrower and attempt to obtain additional collateral. If this is not forthcoming and payment in full is unlikely, the Company will estimate its probable loss and immediately charge-off some or all of the balance. The general reserve component of the allowance for credit losses also consists of reserve factors that are based on management's assessment of the following for each portfolio segment: (1) inherent credit risk; (2) historical losses; and (3) other qualitative factors. These reserve factors are inherently subjective and are driven by the repayment risk associated with each portfolio segment described below: Commercial Real Estate – Commercial real estate mortgage loans are generally considered to possess a higher inherent risk of loss than the Company’s commercial, agricultural and consumer loan types. Adverse economic developments or an overbuilt market impact commercial real estate projects and may result in troubled loans. Trends in vacancy rates of commercial properties impact the credit quality of these loans. High vacancy rates reduce operating revenues and the ability for properties to produce sufficient cash flow to service debt obligations. Real Estate Construction – Real estate construction loans, including land loans, are generally considered to possess a higher inherent risk of loss than the Company’s commercial, agricultural and consumer loan types. A major risk arises from the necessity to complete projects within specified cost and time lines. Trends in the construction industry significantly impact the credit quality of these loans, as demand drives construction activity. In addition, trends in real estate values significantly impact the credit quality of these loans, as property values determine the economic viability of construction projects. Commercial – These loans are generally considered to possess a moderate inherent risk of loss because they are shorter-term; typically made to relationship customers; generally underwritten to existing cash flows of operating businesses; and may be collateralized by fixed assets, inventory and/or accounts receivable. Debt coverage is provided by business cash flows and economic trends influenced by unemployment rates and other key economic indicators are closely correlated to the credit quality of these loans. Agricultural Real Estate and Agricultural – These loans are generally considered to possess a moderate inherent risk of loss since they are typically made to relationship customers and are secured by crop production, livestock and related real estate. These loans are vulnerable to two risk factors that are largely outside the control of Company and borrowers: commodity prices and weather conditions. Leases – Equipment leases are generally considered to possess a moderate inherent risk of loss. As lessor, the Company is subject to both the credit risk of the borrower and the residual value risk of the equipment. Credit risks are underwritten using the same credit criteria the Company would use when making an equipment term loan. Residual value risk is managed through the use of qualified, independent appraisers that establish the residual values the Company uses in structuring a lease. Residential 1st Mortgages and Home Equity Lines and Loans – These loans are generally considered to possess a low inherent risk of loss, although this is not always true as evidenced by the correction in residential real estate values that occurred between 2007 and 2012. The degree of risk in residential real estate lending depends primarily on the loan amount in relation to collateral value, the interest rate and the borrower's ability to repay in an orderly fashion. Economic trends determined by unemployment rates and other key economic indicators are closely correlated to the credit quality of these loans. Weak economic trends indicate that the borrowers' capacity to repay their obligations may be deteriorating. Consumer & Other – A consumer installment loan portfolio is usually comprised of a large number of small loans scheduled to be amortized over a specific period. Most installment loans are made for consumer purchases. Economic trends determined by unemployment rates and other key economic indicators are closely correlated to the credit quality of these loans. Weak economic trends indicate that the borrowers' capacity to repay their obligations may be deteriorating. At least quarterly, the Board of Directors reviews the adequacy of the allowance, including consideration of the relative risks in the portfolio, current economic conditions and other factors. If the Board of Directors and management determine that changes are warranted based on those reviews, the allowance is adjusted. In addition, the Company's and Bank's regulators, including the Federal Reserve Board (“FRB”), the California Department of Business Oversight (“DBO”) and the Federal Deposit Insurance Corporation (“FDIC”), as an integral part of their examination process, review the adequacy of the allowance. These regulatory agencies may require additions to the allowance based on their judgment about information available at the time of their examinations. Acquired Loans Loans acquired through purchase or through a business combination are recorded at their fair value at the acquisition date. Credit discounts, which reflect estimates of credit losses, expected to be incurred over the life of the loan, are included in the determination of fair value; therefore, an allowance for loan losses is not recorded at the acquisition date. Allowance for Credit Losses on Off-Balance-Sheet Credit Exposures The Company also maintains a separate allowance for off-balance-sheet commitments. Management estimates anticipated losses using historical data and utilization assumptions. The allowance for off-balance-sheet commitments is included in Interest Payable and Other Liabilities on the Company’s Consolidated Balance Sheet. Premises and Equipment Premises, equipment, and leasehold improvements are stated at cost, less accumulated depreciation and amortization. Depreciation is computed principally by the straight-line method over the estimated useful lives of the assets. Estimated useful lives of buildings range from 30 to 40 years, and for furniture and equipment from 3 to 7 years. Leasehold improvements are amortized over the lesser of the terms of the respective leases, or their useful lives, which are generally 5 to 10 years. Remodeling and capital improvements are capitalized while maintenance and repairs are charged directly to occupancy expense. Other Real Estate Other real estate, which is included in other assets, is expected to be sold and is comprised of properties no longer utilized for business operations and property acquired through foreclosure in satisfaction of indebtedness. These properties are recorded at fair value less estimated selling costs upon acquisition. Revised estimates to the fair value less cost to sell are reported as adjustments to the carrying amount of the asset, provided that such adjusted value is not in excess of the carrying amount at acquisition. Initial losses on properties acquired through full or partial satisfaction of debt are treated as credit losses and charged to the allowance for credit losses at the time of acquisition. Subsequent declines in value from the recorded amounts, routine holding costs, and gains or losses upon disposition, if any, are included in non-interest expense as incurred. Income Taxes The Company uses the liability method of accounting for income taxes. This method results in the recognition of deferred tax assets and liabilities that 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. As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes. The deferred provision for income taxes is the result of the net change in the deferred tax asset and deferred tax liability balances during the year. This amount combined with the current taxes payable or refundable results in the income tax expense for the current year. The Company follows the standards set forth in the “Income Taxes” topic of the Financial Accounting Standards Board (“FASB”) Accounting Standard Codification (“ASC”), which clarifies the accounting for uncertainty in income taxes recognized in an enterprise’s financial statements. This standard prescribes a recognition threshold and measurement standard for the financial statement recognition and measurement of an income tax position taken or expected to be taken in a tax return. It also provides guidance on derecognition, classification, interest and penalties, accounting in interim periods, disclosure, and transition. The Company accounts for leases with Investment Tax Credits (ITC) under the deferred method as established in ASC 740-10. ITC are viewed and accounted for as a reduction of the cost of the related assets and presented as deferred income on the Company’s financial statement. When tax returns are filed, it is highly certain that some positions taken would be sustained upon examination by the taxing authorities, while others are subject to uncertainty about the merits of the position taken or the amount of the position that would be ultimately sustained. The benefit of a tax position is recognized in the financial statements in the period during which, based on all available evidence, management believes it is more likely than not that the position will be sustained upon examination, including the resolution of appeals or litigation processes, if any. Tax positions taken are not offset or aggregated with other positions. Tax positions that meet the more-likely-than-not recognition threshold are measured as the largest amount of tax benefit that is more than 50 percent likely of being realized upon settlement with the applicable taxing authority. The portion of the benefits associated with tax positions taken that exceeds the amount measured as described above is reflected as a liability for unrecognized tax benefits in the accompanying consolidated balance sheet along with any associated interest and penalties that would be payable to the taxing authorities upon examination. Interest expense and penalties associated with unrecognized tax benefits, if any, are included in the provision for income taxes in the Consolidated Statements of Income. Basic Earnings Per Common Share The Company’s common stock is not traded on any exchange. The shares are primarily held by local residents and are not actively traded. Basic earnings per common share amounts are computed by dividing net income by the weighted average number of common shares outstanding for the period. There are no common stock equivalent shares. Therefore, there is no presentation of diluted basic earnings per common share. See Note 16 for additional information. Segment Reporting The “Segment Reporting” topic of the FASB ASC requires that public companies report certain information about operating segments. It also requires that public companies report certain information about their products and services, the geographic areas in which they operate, and their major customers. The Company is a holding company for a community bank, which offers a wide array of products and services to its customers. Pursuant to its banking strategy, emphasis is placed on building relationships with its customers, as opposed to building specific lines of business. As a result, the Company is not organized around discernible lines of business and prefers to work as an integrated unit to customize solutions for its customers, with business line emphasis and product offerings changing over time as needs and demands change. Therefore, the Company only reports one segment. Low Income Housing Tax Credit Investments (LIHTC) The Company accounts for its interest in LIHTC using the cost method as established in ASC 323-740. As an investor, the Company obtains income tax credits and deductions from the operating losses of these tax credit entities. The income tax credits and deductions are allocated to the investors based on their ownership percentages and are recorded as a reduction of income tax expense (or an increase to income tax benefit) and a reduction of federal income taxes payable. Comprehensive Income The “Comprehensive Income” topic of the FASB ASC establishes standards for the reporting and display of comprehensive income and its components in the financial statements. Other comprehensive income (loss) refers to revenues, expenses, gains, and losses that U.S. GAAP recognize as changes in value to an enterprise but are excluded from net income. For the Company, comprehensive income includes net income and changes in fair value of its available-for-sale investment securities. Loss Contingencies Loss contingencies, including claims and legal actions arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated. Management does not believe there now are such matters that will have a material effect on the financial statements. Business Combinations And Related Matters Business combinations are accounted for under the acquisition method of accounting in accordance with ASC 805, Business Combinations. Under the acquisition method, the acquiring entity in a business combination recognizes 100 percent of the acquired assets and assumed liabilities, regardless of the percentage owned, at their estimated fair values as of the date of acquisition. Any excess of the fair value over the purchase price of net assets and other identifiable intangible assets acquired is recorded as bargain purchase gain. Assets acquired and liabilities assumed from contingencies must also be recognized at fair value, if the fair value can be determined during the measurement period. Results of operations of an acquired business are included in the statement of operations from the date of acquisition. Acquisition-related costs, including conversion charges, are expensed as incurred. The Company applied this guidance to the acquisition of Delta National Bancorp that was consummated on November 18, 2016. The Company's consolidated financial statements reflect the operations of Delta National Bancorp from November 19, 2016 through December 31, 2016. Intangible Assets Intangible assets are comprised of core deposit intangibles acquired in the Delta National Bancorp acquisition. Intangible assets with definite useful lives are amortized over their respective estimated useful lives. If an event occurs that indicates the carrying amount of an intangible asset may not be recoverable, management reviews the asset for impairment.

Business Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Business Combinations	2. Business Combinations Delta National Bancorp On November 18, 2016, the Company completed the acquisition of Delta National Bancorp. Delta National Bancorp was incorporated under the laws of the State of California on December 21, 1981, for the purpose of serving as a bank holding company under the Bank Holding Act of 1956. Its wholly owned subsidiary, Delta Bank, N.A., operated as a commercial bank with branches in the cities of Manteca, Riverbank, Turlock, and Modesto, California. The acquisition enhances our market presence and added $32.4 million in loans, $103.7 million in deposits and $38.7 million in investment securities to the Company. Effective December 9, 2016, the Modesto branch was closed after Management determined that our customers and the business community could be easily supported from our current Modesto location. The assets acquired and liabilities assumed, both tangible and intangible, were recorded at their fair values as of the acquisition date in accordance with ASC 805, Business Combinations

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2017
Investment Securities [Abstract]
Investment Securities	3. Investment Securities The amortized cost, fair values, and unrealized gains and losses of the securities available-for-sale (in thousands) Amortized Gross Unrealized Fair/Book December 31, 2017 Cost Gains Losses Value Government Agency & Government-Sponsored Entities $ 3,080 $ 48 $ - $ 3,128 US Treasury Notes 144,606 - 442 144,164 US Govt SBA 29,559 29 208 29,380 Mortgage Backed Securities (1) 302,502 939 1,527 301,914 Other 3,010 - - 3,010 Total $ 482,757 $ 1,016 $ 2,177 $ 481,596 Amortized Gross Unrealized Fair/Book December 31, 2016 Cost Gains Losses Value Government Agency & Government-Sponsored Entities $ 3,127 $ 114 $ - $ 3,241 US Treasury Notes 134,755 5 332 134,428 US Govt SBA 36,532 42 260 36,314 Mortgage Backed Securities (1) 272,858 1,725 1,313 273,270 Other 1,010 - - 1,010 Total $ 448,282 $ 1,886 $ 1,905 $ 448,263 (1) All Mortgage Backed Securities were issued by an agency or government sponsored entity of the U.S. government. The book values, estimated fair values and unrealized gains and losses of investments classified as held-to-maturity (in thousands) Book Gross Unrealized Fair December 31, 2017 Value Gains Losses Value Obligations of States and Political Subdivisions $ 54,460 $ 776 $ - $ 55,236 Total $ 54,460 $ 776 $ - $ 55,236 Book Gross Unrealized Fair December 31, 2016 Value Gains Losses Value Obligations of States and Political Subdivisions $ 58,109 $ 339 $ 40 $ 58,408 Total $ 58,109 $ 339 $ 40 $ 58,408 Fair values are based on quoted market prices or dealer quotes. If a quoted market price or dealer quote is not available, fair value is estimated using quoted market prices for similar securities. The amortized cost and estimated fair values of investment securities at December 31, 2017 by contractual maturity are shown in the following tables. (in thousands) Available-for-Sale Held-to-Maturity December 31, 2017 Amortized Cost Fair/Book Value Book Value Fair Value Within One Year $ 113,065 $ 112,989 $ 1,760 $ 1,769 After One Year Through Five Years 30,207 29,979 8,659 8,664 After Five Years Through Ten Years 13,044 12,922 14,155 14,347 After Ten Years 23,939 23,792 29,886 30,456 180,255 179,682 54,460 55,236 Investment Securities Not Due at a Single Maturity Date: Mortgage Backed Securities 302,502 301,914 - - Total $ 482,757 $ 481,596 $ 54,460 $ 55,236 Expected maturities of mortgage-backed securities may differ from contractual maturities because borrowers have the right to call or prepay obligations with or without call or prepayment penalties. The following tables show those investments with gross unrealized losses and their market value aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at the dates indicated. (in thousands) Less Than 12 Months 12 Months or More Total December 31, 2017 Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Securities Available-for-Sale US Treasury Notes $ 94,281 $ 144 $ 49,883 $ 298 $ 144,164 $ 442 US Govt SBA 8,379 51 12,900 157 21,279 208 Mortgage Backed Securities 126,863 932 43,208 595 170,071 1,527 Total $ 229,523 $ 1,127 $ 105,991 $ 1,050 $ 335,514 $ 2,177 Less Than 12 Months 12 Months or More Total December 31, 2016 Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Securities Available-for-Sale US Treasury Notes $ 99,429 $ 332 $ - $ - $ 99,429 $ 332 US Govt SBA 27,483 260 - - 27,483 260 Mortgage Backed Securities 123,157 1,313 - - 123,157 1,313 Total $ 250,069 $ 1,905 $ - $ - $ 250,069 $ 1,905 Securities Held-to-Maturity Obligations of States and Political Subdivisions $ 7,251 $ 40 $ - $ - $ 7,251 $ 40 Total $ 7,251 $ 40 $ - $ - $ 7,251 $ 40 As of December 31, 2017, the Company held 476 investment securities of which 97 were in an unrealized loss position for less than twelve months and 98 securities were in an unrealized loss position for twelve months or more. Management periodically evaluates each investment security for other-than-temporary impairment relying primarily on industry analyst reports and observations of market conditions and interest rate fluctuations. Management believes it will be able to collect all amounts due according to the contractual terms of the underlying investment securities. Securities of Government Agency and Government Sponsored Entities – At December 31, 2017, no securities of government agency and government sponsored entities were in a loss position for less than 12 months and none were in a loss position for 12 months or more. There were no unrealized losses on the Company's investments in securities of government agency and government sponsored entities at December 31, 2017 or December 31, 2016. Repayment of these investments is guaranteed by an agency or government sponsored entity of the U.S. government. Accordingly, it is expected that the securities would not be settled at a price less than the amortized cost of the Company's investment. Because the decline in market value is attributable to changes in interest rates and not credit quality, and because the Company does not intend to sell the securities and it is more likely than not that the Company will not have to sell the securities before recovery of their cost basis, the Company did not consider these investments to be other-than-temporarily impaired at December 31, 2017. U.S. Treasury Notes – At December 31, 2017, 7 U.S. Treasury Note security investments were in a loss position for less than 12 months and 2 were in a loss position for 12 months or more. The unrealized losses on the Company's investment in US treasury notes were $442,000 at December 31, 2017 and $332,000 at December 31, 2016. The unrealized losses were caused by interest rate fluctuations. Because the decline in market value is attributable to changes in interest rates and not credit quality, and because the Company does not intend to sell the securities and it is more likely than not that the Company will not have to sell the securities before recovery of their cost basis, the Company did not consider these investments to be other-than-temporarily impaired at December 31, 2017 and December 31, 2016. U.S. Government SBA – At December 31, 2017, 54 U.S. Government SBA security investments were in a loss position for less than 12 months and 70 were in a loss position for 12 months or more. The unrealized losses on the Company's investment in U.S. Government SBA were $208,000 at December 31, 2017 and $260,000 at December 31, 2016. The unrealized losses were caused by interest rate fluctuations. Because the decline in market value is attributable to changes in interest rates and not credit quality, and because the Company does not intend to sell the securities and it is more likely than not that the Company will not have to sell the securities before recovery of their cost basis, the Company did not consider these investments to be other-than-temporarily impaired at December 31, 2017 and December 31, 2016. Mortgage Backed Securities - At December 31, 2017, 26 mortgage backed security investments were in a loss position for less than 12 months and 36 was in a loss position for 12 months or more. The unrealized losses on the Company's investment in mortgage-backed securities were $1.5 million at December 31, 2017 and $1.3 million at December 31, 2016. The unrealized losses were caused by interest rate fluctuations. The contractual cash flows of these investments are guaranteed by an agency or government sponsored entity of the U.S. government. Accordingly, it is expected that the securities would not be settled at a price less than the amortized cost of the Company's investment. Because the decline in market value is attributable to changes in interest rates and not credit quality, and because the Company does not intend to sell the securities and it is more likely than not that the Company will not have to sell the securities before recovery of their cost basis, the Company did not consider these investments to be other-than-temporarily impaired at December 31, 2017 or 2016. Obligations of States and Political Subdivisions - At December 31, 2017, no obligations of states and political subdivisions were in a loss position for less than 12 months. None were in a loss position for 12 months or more. As of December 31, 2017, over ninety-nine percent of the Company’s bank-qualified municipal bond portfolio is rated at either the issue or the issuer level, and all of these ratings are “investment grade.” The Company monitors the status of the one percent of the portfolio that is not rated and at the current time does not believe any of them to be exhibiting financial problems that could result in a loss in any individual security. The unrealized losses on the Company’s investment in obligation of states and political subdivisions were $0 at December 31, 2017 and $40,000 at December 31, 2016. Management believes that any unrealized losses on the Company's investments in obligations of states and political subdivisions were caused by interest rate fluctuations. The contractual terms of these investments do not permit the issuer to settle the securities at a price less than the amortized cost of the investment. Because the Company does not intend to sell the securities and it is more likely than not that the Company would not have to sell the securities before recovery of their cost basis, the Company did not consider these investments to be other-than-temporarily impaired at December 31, 2017 and December 31, 2016. Proceeds from sales and calls of these securities were as follows: (in thousands) Gross Proceeds Gross Gains Gross Losses 2017 $ 7,831 $ 143 $ 12 2016 $ 105,941 $ 250 $ 534 2015 $ 61,335 $ 275 $ - Pledged Securities As of December 31, 2017, securities carried at $214.5 million were pledged to secure public deposits, Federal Home Loan Bank (“FHLB”) borrowings, and other government agency deposits as required by law. This amount was $171.9 million at December 31, 2016. Investment in Unconsolidated Subsidiary On April 5, 2017, the Company purchased 4.9% of the voting shares of Bank of Rio Vista, Rio Vista, California for $1.4 million. On July 3, 2017, the Federal Reserve Bank of San Francisco approved the Company’s application to acquire an additional 34.55% of the voting shares for $10.5 million. The purchase of the additional shares closed on July 20, 2017. The Company, as per requirements outlined in ASC 323-10-15-6, does not have the ability to exercise significant influence over BORV’s operating and financial policies. Accordingly, the investment in BORV is accounted for under the cost method of accounting as Other Assets.

Federal Home Loan Bank Stock an

Federal Home Loan Bank Stock and Other Equity Securities, at Cost	12 Months Ended
	Dec. 31, 2017
Federal Home Loan Bank Stock and Other Equity Securities, at Cost [Abstract]
Federal Home Loan Bank Stock and Other Equity Securities, at Cost	4. Federal Home Loan Bank Stock and Other Equity Securities, at Cost The Bank is a member of the FHLB system. Members are required to own a certain amount of stock based on the level of borrowings and other factors, and may invest in additional amounts. FHLB stock and other equity securities are carried at cost, classified as restricted securities, and periodically evaluated for impairment based on ultimate recovery of par value. Both cash and stock dividends are reported as income. FHLB stock and other equity securities are reported in Interest Receivable and Other Assets on the Company’s Consolidated Balance Sheets and totaled $22.6 million at December 31, 2017 and $9.2 million at December 31, 2016.

Loans & Leases

Loans & Leases	12 Months Ended
	Dec. 31, 2017
Loans & Leases [Abstract]
Loans & Leases	5. Loans & Leases Loans & leases as of December 31 consisted of the following: (in thousands) 2017 2016 Commercial Real Estate $ 691,639 $ 674,445 Agricultural Real Estate 499,231 467,685 Real Estate Construction 100,206 176,462 Residential 1st Mortgages 260,751 242,247 Home Equity Lines and Loans 34,525 31,625 Agricultural 273,582 295,325 Commercial 265,703 217,577 Consumer & Other 6,656 6,913 Leases 88,957 70,986 Total Gross Loans & Leases 2,221,250 2,183,265 Less: Unearned Income 5,955 5,664 Subtotal 2,215,295 2,177,601 Less: Allowance for Credit Losses 50,342 47,919 Loans & Leases, Net $ 2,164,953 $ 2,129,682 At December 31, 2017, the portion of loans that were approved for pledging as collateral on borrowing lines with the Federal Home Loan Bank (“FHLB”) and the Federal Reserve Bank (“FRB”) were $618.4 million and $568.6 million, respectively. The borrowing capacity on these loans was $521.2 million from FHLB and $381.4 million from the FRB.

Allowance for Credit Losses

Allowance for Credit Losses	12 Months Ended
	Dec. 31, 2017
Allowance for Credit Losses [Abstract]
Allowance for Credit Losses	6. Allowance for Credit Losses The following tables show the allocation of the allowance for credit losses at December 31, 2017 and December 31, 2016 by portfolio segment and by impairment methodology (in thousands) December 31, 2017 Commercial Real Estate Agricultural Real Estate Real Estate Construction Residential 1st Mortgages Home Equity Lines & Loans Agricultural Commercial Consumer & Other Leases Unallocated Total Year-To-Date Allowance for Credit Losses: Beginning Balance- January 1, 2017 $ 11,110 $ 9,450 $ 3,223 $ 865 $ 2,140 $ 7,381 $ 8,515 $ 200 $ 3,586 $ 1,449 $ 47,919 Charge-Offs (109 ) - - (53 ) (3 ) (374 ) - (146 ) - - (685 ) Recoveries 109 - - 40 8 17 8 76 - - 258 Provision (188 ) 2,635 (1,377 ) (37 ) 179 1,135 674 79 (223 ) (27 ) 2,850 Ending Balance- December 31, 2017 $ 10,922 $ 12,085 $ 1,846 $ 815 $ 2,324 $ 8,159 $ 9,197 $ 209 $ 3,363 $ 1,422 $ 50,342 Ending Balance Individually Evaluated for Impairment 366 - - 73 17 - 220 8 - - 684 Ending Balance Collectively Evaluated for Impairment 10,556 12,085 1,846 742 2,307 8,159 8,977 201 3,363 1,422 49,658 Loans & Leases: Ending Balance $ 684,961 $ 499,231 $ 100,206 $ 260,751 $ 34,525 $ 273,582 $ 265,703 $ 6,656 $ 89,680 $ - $ 2,215,295 Ending Balance Individually Evaluated for Impairment 4,822 - - 2,373 340 - 1,734 10 - - 9,279 Ending Balance Collectively Evaluated for Impairment 680,139 499,231 100,206 258,378 34,185 273,582 263,969 6,646 89,680 - 2,206,016 December 31, 2016 Commercial Real Estate Agricultural Real Estate Real Estate Construction Residential 1st Mortgages Home Equity Lines & Loans Agricultural Commercial Consumer & Other Leases Unallocated Total Year-To-Date Allowance for Credit Losses: Beginning Balance- January 1, 2016 $ 10,063 $ 6,881 $ 2,485 $ 789 $ 2,146 $ 6,308 $ 7,836 $ 175 $ 3,294 $ 1,546 $ 41,523 Charge-Offs - - - (21 ) (46 ) - - (105 ) - - (172 ) Recoveries 2 - - 26 103 - 47 55 - - 233 Provision 1,045 2,569 738 71 (63 ) 1,073 632 75 292 (97 ) 6,335 Ending Balance- December 31, 2016 $ 11,110 $ 9,450 $ 3,223 $ 865 $ 2,140 $ 7,381 $ 8,515 $ 200 $ 3,586 $ 1,449 $ 47,919 Ending Balance Individually Evaluated for Impairment - - - 70 18 128 608 7 - - 831 Ending Balance Collectively Evaluated for Impairment 11,110 9,450 3,223 795 2,122 7,253 7,907 193 3,586 1,449 47,088 Loans & Leases: Ending Balance $ 668,046 $ 467,685 $ 176,462 $ 242,247 $ 31,625 $ 295,325 $ 217,577 $ 6,913 $ 71,721 $ - $ 2,177,601 Ending Balance Individually Evaluated for Impairment 1,932 1,304 - 2,126 402 625 4,464 10 - - 10,863 Ending Balance Collectively Evaluated for Impairment 666,114 466,381 176,462 240,121 31,223 294,700 213,113 6,903 71,721 - 2,166,738 The ending balance of loans individually evaluated for impairment includes restructured loans in the amount of $3.0 million and $3.3 million at December 31, 2017 and 2016, respectively, which are no longer disclosed or classified as TDR’s. The following tables show the loan & lease portfolio allocated by management’s internal risk ratings at December 31, 2017 and December 31, 2016 (in thousands) December 31, 2017 Pass Special Mention Substandard Total Loans Loans & Leases: Commercial Real Estate $ 677,636 $ 6,843 $ 482 $ 684,961 Agricultural Real Estate 488,672 6,529 4,030 499,231 Real Estate Construction 90,728 9,478 - 100,206 Residential 1st Mortgages 259,795 41 915 260,751 Home Equity Lines and Loans 34,476 - 49 34,525 Agricultural 264,425 6,439 2,718 273,582 Commercial 260,565 4,610 528 265,703 Consumer & Other 6,498 - 158 6,656 Leases 87,497 2,183 - 89,680 Total $ 2,170,292 $ 36,123 $ 8,880 $ 2,215,295 December 31, 2016 Pass Special Mention Substandard Total Loans Loans & Leases: Commercial Real Estate $ 659,694 $ 6,817 $ 1,535 $ 668,046 Agricultural Real Estate 464,997 1,384 1,304 467,685 Real Estate Construction 176,462 - - 176,462 Residential 1st Mortgages 241,816 47 384 242,247 Home Equity Lines and Loans 31,558 - 67 31,625 Agricultural 283,525 11,366 434 295,325 Commercial 208,172 6,974 2,431 217,577 Consumer & Other 6,705 - 208 6,913 Leases 71,721 - - 71,721 Total $ 2,144,650 $ 26,588 $ 6,363 $ 2,177,601 See Note 1. Significant Accounting Policies – Allowance for Credit Losses for a description of the internal risk ratings used by the Company. There were no loans & leases outstanding at December 31, 2017 and 2016 rated doubtful or loss. The following tables show an aging analysis of the loan & lease portfolio by the time past due at December 31, 2017 and December 31, 2016 (in thousands) December 31, 2017 30-59 Days Past Due 60-89 Days Past Due 90 Days and Still Accruing Nonaccrual Total Past Due Current Total Loans & Leases Loans & Leases: Commercial Real Estate $ - $ - $ - $ - $ - $ 684,961 $ 684,961 Agricultural Real Estate - - - - - 499,231 499,231 Real Estate Construction - - - - - 100,206 100,206 Residential 1st Mortgages 448 - - - 448 260,303 260,751 Home Equity Lines and Loans 10 - - - 10 34,515 34,525 Agricultural - - - - - 273,582 273,582 Commercial 180 - - - 180 265,523 265,703 Consumer & Other 7 - - - 7 6,649 6,656 Leases - - - - - 89,680 89,680 Total $ 645 $ - $ - $ - $ 645 $ 2,214,650 $ 2,215,295 December 31, 2016 30-59 Days Past Due 60-89 Days Past Due 90 Days and Still Accruing Nonaccrual Total Past Due Current Total Loans & Leases Loans & Leases: Commercial Real Estate $ - $ - $ - $ - $ - $ 668,046 $ 668,046 Agricultural Real Estate - - - 1,304 1,304 466,381 467,685 Real Estate Construction - - - - - 176,462 176,462 Residential 1st Mortgages - - - 95 95 242,152 242,247 Home Equity Lines and Loans - - - - - 31,625 31,625 Agricultural - - - 243 243 295,082 295,325 Commercial - - - 1,425 1,425 216,152 217,577 Consumer & Other 10 - - 7 17 6,896 6,913 Leases - - - - - 71,721 71,721 Total $ 10 $ - $ - $ 3,074 $ 3,084 $ 2,174,517 $ 2,177,601 There were no non-accrual loans & leases at December 31, 2017. At December 31, 2016, non-accrual loans & leases were $3.1 million. $0, The following tables show information related to impaired loans & leases at and for the year ended December 31, 2017 and December 31, 2016 (in thousands) December 31, 2017 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized With no related allowance recorded: Commercial Real Estate $ 104 $ 104 $ - $ 107 $ 11 Agricultural Real Estate - - - 488 - Residential 1st Mortgages 911 1,012 - 532 11 Home Equity Lines and Loans - - - 16 - Agricultural - - - 30 - $ 1,015 $ 1,116 $ - $ 1,173 $ 22 With an allowance recorded: Commercial Real Estate $ 2,973 $ 2,961 $ 366 $ 2,999 $ 104 Residential 1st Mortgages 508 571 25 469 16 Home Equity Lines and Loans 73 89 4 74 3 Agricultural - - - 409 21 Commercial 1,741 1,734 220 1,693 59 Consumer & Other 8 9 8 11 - $ 5,303 $ 5,364 $ 623 $ 5,655 $ 203 Total $ 6,318 $ 6,480 $ 623 $ 6,828 $ 225 December 31, 2016 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized With no related allowance recorded: Commercial Real Estate $ 184 $ 184 $ - $ 354 $ 7 Agricultural Real Estate 1,305 1,305 - 569 3 Residential 1st Mortgages 451 504 - 404 10 Home Equity Lines and Loans - - - 181 - Agricultural - - - 144 5 Commercial 3,023 3,023 - 3,053 133 $ 4,963 $ 5,016 $ - $ 4,705 $ 158 With an allowance recorded: Residential 1st Mortgages $ 430 $ 469 $ 21 $ 336 $ 13 Home Equity Lines and Loans 90 97 5 123 4 Agricultural 625 625 128 581 22 Commercial 1,441 1,640 608 1,536 8 Consumer & Other 6 13 6 12 - $ 2,592 $ 2,844 $ 768 $ 2,588 $ 47 Total $ 7,555 $ 7,860 $ 768 $ 7,293 $ 205 Total recorded investment shown in the prior table will not equal the total ending balance of loans & leases individually evaluated for impairment on the allocation of allowance table. This is because this table does not include impaired loans that were previously modified in a troubled debt restructuring, are currently performing and are no longer disclosed or classified as TDR’s. At December 31, 2017, the Company allocated $623,000 of specific reserves to $6.3 million of troubled debt restructured loans, all of which were performing. At December 31, 2016, the Company allocated $736,000 of specific reserves to $5.9 million of troubled debt restructured loans, of which $4.5 million were performing. The Company had no commitments at December 31, 2017 and December 31, 2016 to lend additional amounts to customers with outstanding loans that are classified as troubled debt restructurings. During the period ending December 31, 2017, the terms of certain loans were modified as troubled debt restructurings. The modification of the terms of such loans included one or a combination of the following: a reduction of the stated interest rate of the loan; an extension of the maturity date at a stated rate of interest lower than the current market rate for new debt with similar risk; or a permanent reduction of the recorded investment in the loan. Modifications involving a reduction of the stated interest rate of the loan ranged from 3 to 5 years. Modifications involving an extension of the maturity date ranged from 3 to 10 years. The following table presents loans by class modified as troubled debt restructured loans for the period ended December 31, 2017 (in thousands) December 31, 2017 Troubled Debt Restructurings Number of Loans Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Residential 1st Mortgages 2 $ 673 $ 630 Home Equity Lines and Loans 1 32 32 Commercial 2 138 138 Consumer & Other 1 9 8 Total 6 $ 852 $ 808 The troubled debt restructurings described above had no impact on the allowance for credit losses and resulted in charge-offs of $44,000 for the twelve months ended December 31, 2017. During the period ended December 31, 2017, there were no payment defaults on loans modified as troubled debt restructurings within twelve months following the modification. The Company considers a loan to be in payment default once it is greater than 90 days contractually past due under the modified terms. During the period ending December 31, 2016, the terms of certain loans were modified as troubled debt restructurings. The modification of the terms of such loans included one or a combination of the following: a reduction of the stated interest rate of the loan; an extension of the maturity date at a stated rate of interest lower than the current market rate for new debt with similar risk; or a permanent reduction of the recorded investment in the loan. Modifications involving a reduction of the stated interest rate of the loan were for periods ranging from 5 to 10 years. Modifications involving an extension of the maturity date were for periods ranging from 5 to 10 years. The following table presents loans by class modified as troubled debt restructured loans for the period ended December 31, 2016 (in thousands) December 31, 2016 Troubled Debt Restructurings Number of Loans Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Commercial Real Estate 1 $ 112 $ 112 Residential 1st Mortgages 2 289 281 Home Equity Lines and Loans 2 305 286 Total 5 $ 706 $ 679 The troubled debt restructurings described above had no impact on the allowance for credit losses and resulted in charge-offs of $27,000 for the twelve months ended December 31, 2016. During the period ended December 31, 2016, there were no payment defaults on loans modified as troubled debt restructurings within twelve months following the modification. The Company considers a loan to be in payment default once it is greater than 90 days contractually past due under the modified terms.

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2017
Premises and Equipment [Abstract]
Premises and Equipment	7. Premises and Equipment Premises and equipment as of December 31 st (in thousands) 2017 2016 Land and Buildings $ 36,018 $ 37,003 Furniture, Fixtures, and Equipment 20,399 20,196 Leasehold Improvements 3,117 2,439 Subtotal 59,534 59,638 Less: Accumulated Depreciation and Amortization 30,855 30,409 Total $ 28,679 $ 29,229 Depreciation and amortization on premises and equipment included in occupancy and equipment expense amounted to $2,186,000, $1,896,000, and $1,685,000 for the years ended December 31, 2017, 2016 and 2015, respectively. Total rental expense for premises was $688,000, $644,000, and $604,000 for the years ended December 31, 2017, 2016, and 2015, respectively. Rental income was $169,000, $102,000, and $94,000 for the years ended December 31, 2017, 2016, and 2015, respectively.

Other Real Estate

Other Real Estate	12 Months Ended
	Dec. 31, 2017
Other Real Estate [Abstract]
Other Real Estate	8. Other Real Estate The Bank reported $837,000 in other real estate at December 31, 2017, and $3.7 million at December 31, 2016. Other real estate includes property no longer utilized for business operations and property acquired through foreclosure proceedings. These properties are carried at fair value less selling costs determined at the date acquired. Losses, if any, arising from properties acquired through foreclosure are charged against the allowance for loan losses at the time of foreclosure. Subsequent declines in value, periodic holding costs, and net gains or losses on disposition are included in other operating expense as incurred. Other real estate is reported in Interest Receivable and Other Assets on the Company’s Consolidated Balance Sheets.

Time Deposits

Time Deposits	12 Months Ended
	Dec. 31, 2017
Time Deposits [Abstract]
Time Deposits	9. Time Deposits Time Deposits of $250,000 or more as of December 31 were as follows: (in thousands) 2017 2016 Balance $ 212,574 $ 289,955 At December 31, 2017, the scheduled maturities of time deposits were as follows: Scheduled Maturitie 2018 $ 426,874 2019 30,219 2020 10,317 2021 3,100 2022 4,887 Total $ 475,397

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Taxes [Abstract]
Income Taxes	10. Income Taxes Current and deferred income tax expense (benefit) provided for the years ended December 31 consisted of the following: (in thousands) 2017 2016 2015 Current Federal $ 9,460 $ 13,101 $ 11,979 State 4,046 4,832 4,446 Total Current 13,056 17,933 16,425 Deferred Federal 11,154 (1,607 ) 383 State 1,451 (229 ) 116 Total Deferred 12,605 (1,836 ) 499 Total Provision for Taxes $ 26,111 $ 16,097 $ 16,924 The total provision for income taxes differs from the federal statutory rate as follows: 2017 2016 2015 (in thousands) Amount Rate Amount Rate Amount Rate Tax Provision at Federal Statutory Rate $ 19,068 35.0 % $ 16,037 35.0 % $ 15,510 35.0 % Interest on Obligations of States and Political Subdivisions exempt from Federal Taxation (617 ) (1.1 %) (675 ) (1.5 %) (711 ) (1.6 %) State and Local Income Taxes, Net of Federal Income Tax Benefit 3,573 6.5 % 2,992 6.5 % 2,966 6.7 % Bank Owned Life Insurance (696 ) (1.3 %) (731 ) (1.6 %) (712 ) (1.6 %) Low-Income Housing Tax Credit (1,546 ) (2.8 %) (1,201 ) (2.6 %) (291 ) (0.7 %) Bargain Purchase Gain - 0.0 % (641 ) (1.4 %) - 0.0 % Deferred Tax Asset Remeasurement 6,256 11.5 % - 0.0 % - 0.0 % Other, Net 73 0.1 % 316 0.7 % 162 0.4 % Total Provision for Taxes $ 26,111 47.9 % $ 16,097 35.1 % $ 16,924 38.2 % The components of net deferred tax assets as of December 31 are as follows: The net deferred tax assets are reported in Interest Receivable and Other Assets on the Company's Consolidated Balance Sheet. (in thousands) 2017 2016 Deferred Tax Assets Allowance for Credit Losses $ 14,962 $ 20,260 Accrued Liabilities 7,421 9,807 Deferred Compensation 8,996 14,166 State Franchise Tax 850 1,680 Acquired Net Operating Loss 756 1,135 Fair Value Adjustment on Loans Acquired 242 429 Fair Value Adjustment on ORE Acquired 108 299 Unrealized Loss on Securities Available-for-Sale 373 58 Low-Income Housing Investment 470 366 Other 17 233 Total Deferred Tax Assets $ 34,195 $ 48,433 Deferred Tax Liabilities Premises and Equipment (1,361 ) (1,707 ) Securities Accretion (164 ) (341 ) Leasing Activities (12,389 ) (14,868 ) Core Deposit Intangible Asset (247 ) (398 ) Prepaid (964 ) (314 ) Other (944 ) (494 ) Total Deferred Tax Liabilities (16,069 ) (18,122 ) Net Deferred Tax Assets $ 18,126 $ 30,311 The Tax Cuts and Jobs Act, which lowers the Company’s previous 35% federal corporate tax rate to 21%, was signed into law by President Trump on December 22, 2017. In accordance with the ASC Topic 740, Income Taxes, companies must recognize the effect of tax law changes in the period of enactment. As a result, the Company is required to re-measure its deferred tax assets (DTA) and deferred tax liabilities (DTL) at the new tax rate of 21%. This onetime re-measurement resulted in a $6.3 million increase in the Company’s income tax provision. Based upon the level of historical taxable income and projections for future taxable income over the periods during which the deferred tax assets are expected to be deductible, Management believes it is more likely than not we will realize the benefit of the remaining deferred tax assets. The net deferred tax assets are reported in Interest Receivable and Other Assets on the Company’s Consolidated Balance Sheet. The Company and its subsidiaries file income tax returns in the U.S. federal and California jurisdictions. With few exceptions, the Company is no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations by the tax authorities for the years before 2013.

Short Term Borrowings

Short Term Borrowings	12 Months Ended
	Dec. 31, 2017
Short Term Borrowings [Abstract]
Short Term Borrowings	11. Short Term Borrowings As of December 31, 2017 and 2016, the Company had unused lines of credit available for short-term liquidity purposes of $1.0 billion and $962.8 million, respectively. Federal Funds purchased and advances are generally issued on an overnight basis. There were no advances from the FHLB at December 31, 2017 or 2016. There were no Federal Funds purchased or advances from the FRB at December 31, 2017 or 2016.

Securities Sold Under Agreement

Securities Sold Under Agreement to Repurchase	12 Months Ended
	Dec. 31, 2017
Securities Sold Under Agreement to Repurchase [Abstract]
Securities Sold Under Agreement to Repurchase	12. Securities Sold Under Agreement to Repurchase Securities Sold Under Agreement to Repurchase are used as secured borrowing alternatives to FHLB Advances or FRB Borrowings. At December 31, 2017 and December 31, 2016, the Company had no securities sold under agreement to repurchase.

Federal Home Loan Bank Advances

Federal Home Loan Bank Advances	12 Months Ended
	Dec. 31, 2017
Federal Home Loan Bank Advances [Abstract]
Federal Home Loan Bank Advances	13. Federal Home Loan Bank Advances The Company had no short-term or long-term advances from the Federal Home Loan Bank of San Francisco at December 31, 2017 or 2016. In accordance with the Collateral Pledge and Security Agreement, advances are secured by all FHLB stock held by the Company. At December 31, 2017, $618.4 million in loans were approved for pledging as collateral on borrowing lines with the FHLB. The borrowing capacity on these loans was $521.2 million.

Long-term Subordinated Debentur

Long-term Subordinated Debentures	12 Months Ended
	Dec. 31, 2017
Long-term Subordinated Debentures [Abstract]
Long-term Subordinated Debentures	14. Long-term Subordinated Debentures In December 2003, the Company formed a wholly owned Connecticut statutory business trust, FMCB Statutory Trust I (“Statutory Trust I”), which issued $10.0 million of guaranteed preferred beneficial interests in the Company’s junior subordinated deferrable interest debentures (the “Trust Preferred Securities”). The Company is not considered the primary beneficiary of the trust (variable interest entity), therefore the trust is not consolidated in the Company’s financial statements, but rather the subordinated debentures are shown as a liability. These debentures qualify as Tier 1 capital under current regulatory guidelines. All of the common securities of Statutory Trust I are owned by the Company. The proceeds from the issuance of the common securities and the Trust Preferred Securities were used by FMCB Statutory Trust to purchase $10.3 million of junior subordinated debentures of the Company, which carry a floating rate based on three-month LIBOR plus 2.85%. The debentures represent the sole asset of Statutory Trust I. The Trust Preferred Securities accrue and pay distributions at a floating rate of three-month LIBOR plus 2.85% per annum of the stated liquidation value of $1,000 per capital security. The Company has entered into contractual arrangements which, taken collectively, fully and unconditionally guarantee payment to the extent that Statutory Trust I has funds available therefore of: (i) accrued and unpaid distributions required to be paid on the Trust Preferred Securities; (ii) the redemption price with respect to any Trust Preferred Securities called for redemption by Statutory Trust I; and (iii) payments due upon a voluntary or involuntary dissolution, winding up, or liquidation of Statutory Trust I. The Trust Preferred Securities are mandatorily redeemable upon maturity of the subordinated debentures on December 17, 2033, or upon earlier redemption as provided in the indenture. The Company has the right to redeem the subordinated debentures purchased by Statutory Trust I, in whole or in part, on or after December 17, 2008. As specified in the indenture, if the subordinated debentures are redeemed prior to maturity, the redemption price will be the principal amount and any accrued but unpaid interest. Additionally, if the Company decided to defer interest on the subordinated debentures, the Company would be prohibited from paying cash dividends on the Company’s common stock.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2017
Shareholders' Equity [Abstract]
Shareholders' Equity	15. Shareholders' Equity In 1998, the Board approved the Company’s first common stock repurchase program. This program has been extended and expanded several times since then, and most recently, on August 11, 2015, the Board of Directors approved an extension of the $20 million stock repurchase program over the three-year period ending September 30, 2018. Repurchases under the program may be made from time to time on the open market or through private transactions. The repurchase program also requires that no repurchases may be made if the Bank would not remain “well-capitalized” after the repurchase. There were no stock repurchases made in 2017 or 2016. Dividends from the Bank constitute the principal source of cash to the Company. The Company is a legal entity separate and distinct from the Bank. Under regulations controlling California state chartered banks, the Bank is, to some extent, limited in the amount of dividends that can be paid to the Company without prior approval of the California DBO. These regulations require approval if total dividends declared by a state chartered bank in any calendar year exceed the bank's net profits for that year combined with its retained net profits for the preceding two calendar years. During 2017, the Company issued 4,975 shares of common stock. All of these shares were contributed to the Bank’s non-qualified defined contribution retirement plans. The shares issued had prices ranging from $590 per share to $595 per share. These share prices were based upon valuations completed by a nationally recognized bank consulting and advisory firm and in reliance upon the exemption in Section 4(a)(2) of the Securities Act of 1933, as amended, and the regulations promulgated thereunder. The proceeds from these issuances were contributed to the Bank as equity capital. During 2016, the Company issued 16,542 shares of common stock, of which 4,610 shares were contributed to the Bank’s non-qualified defined contribution retirement plans and 11,932 shares were issued in the acquisition of Delta National Bancorp. The shares issued had prices ranging from $525 per share to $580 per share. These share prices were based upon valuations completed by a nationally recognized bank consulting and advisory firm and in reliance upon the exemption in Section 4(a)(2) of the Securities Act of 1933, as amended, and the regulations promulgated thereunder. The proceeds from these issuances were contributed to the Bank as equity capital. The Company and the Bank are subject to various federal regulatory capital requirements under the Basel III Capital Rules. Failure to meet minimum capital requirements can initiate certain mandatory, and possibly discretionary, actions by regulators that, if undertaken, could have a direct material effect on the Company’s and the Bank's financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of the Company and the Bank's assets, liabilities, and certain off-balance-sheet items as calculated under regulatory accounting practices. The Company and the Bank's capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors. The implementation of Basel III requirements will increase the required capital levels that the Company and the Bank must maintain. The final rules include new minimum risk-based capital and leverage ratios, which would be phased in over time. The new minimum capital level requirements applicable to the Company and the Bank under the final rules will be: (i) a common equity Tier 1 capital ratio of 4.5% of risk-weighted assets (“RWA”); (ii) a Tier 1 capital ratio of 6% of RWA; (iii) a total capital ratio of 8% of RWA; and (iv) a Tier 1 leverage ratio of 4% of total assets. The final rules also establish a "capital conservation buffer" of 2.5% above each of the new regulatory minimum capital ratios, which would result in the following minimum ratios: (i) a common equity Tier 1 capital ratio of 7.0% of RWA; (ii) a Tier 1 capital ratio of 8.5% of RWA; and (iii) a total capital ratio of 10.5% of RWA. An institution will be subject to limitations on paying dividends, engaging in share repurchases, and paying discretionary bonuses if its capital level falls below the buffer amount. The final rules also permit the Company’s subordinated debentures issued in 2003 to continue to be counted as Tier 1 capital. The final rules became effective as applied to the Company and the Bank on January 1, 2015, with a phase in period through January 1, 2019. The Company believes that it is currently in compliance with all of these new capital requirements (as fully phased-in) and that they will not result in any restrictions on the Company’s business activity. In addition, the most recent notification from the FDIC categorized the Bank as “well capitalized” under the regulatory framework for prompt corrective action. To be categorized as well capitalized, the Bank must maintain minimum total risk-based, Tier 1 risk-based and Tier 1 leverage ratios as set forth in the following tables. There are no conditions or events since that notification that management believes have changed the Bank’s category. (in thousands) Actual Current Regulatory Capital Requirements Well Capitalized Under Prompt Corrective Action December 31, 2017 Amount Ratio Amount Ratio Amount Ratio Total Bank Capital to Risk Weighted Assets $ 330,041 12.66 % $ 208,552 8.0 % $ 260,691 10.0 % Total Consolidated Capital to Risk Weighted Assets $ 342,210 13.07 % $ 209,532 8.0 % N/A N/A Total Bank Common Equity Tier 1 Capital Ratio $ 297,232 11.40 % $ 117,311 4.5 % $ 169,449 6.5 % Total Consolidated Common Equity Tier 1 Capital Ratio $ 299,401 11.43 % $ 117,862 4.5 % N/A N/A Tier 1 Bank Capital to Risk Weighted Assets $ 297,232 11.40 % $ 156,414 6.0 % $ 208,552 8.0 % Tier 1 Consolidated Capital to Risk Weighted Assets $ 309,250 11.81 % $ 157,150 6.0 % N/A N/A Tier 1 Bank Capital to Average Assets $ 297,232 9.65 % $ 123,178 4.0 % $ 153,972 5.0 % Tier 1 Consolidated Capital to Average Assets $ 309,250 9.99 % $ 123,790 4.0 % N/A N/A (in thousands) Actual Current Regulatory Capital Requirements Well Capitalized Under Prompt Corrective Action December 31, 2016 Amount Ratio Amount Ratio Amount Ratio Total Bank Capital to Risk Weighted Assets $ 319,776 12.79 % $ 199,958 8.0 % $ 249,947 10.0 % Total Consolidated Capital to Risk Weighted Assets $ 319,983 12.80 % $ 199,981 8.0 % N/A N/A Total Bank Common Equity Tier 1 Capital Ratio $ 288,324 11.54 % $ 112,476 4.5 % $ 162,466 6.5 % Total Consolidated Common Equity Tier 1 Capital Ratio $ 278,981 11.16 % $ 112,489 4.5 % N/A N/A Tier 1 Bank Capital to Risk Weighted Assets $ 288,323 11.54 % $ 149,968 6.0 % $ 199,958 8.0 % Tier 1 Consolidated Capital to Risk Weighted Assets $ 288,527 11.54 % $ 149,986 6.0 % N/A N/A Tier 1 Bank Capital to Average Assets $ 288,324 10.08 % $ 114,409 4.0 % $ 143,011 5.0 % Tier 1 Consolidated Capital to Average Assets $ 288,527 10.07 % $ 114,568 4.0 % N/A N/A

Dividends and Basic Earnings Pe

Dividends and Basic Earnings Per Common Share	12 Months Ended
	Dec. 31, 2017
Dividends and Basic Earnings Per Common Share [Abstract]
Dividends and Basic Earnings Per Common Share	16. Dividends and Basic Earnings Per Common Share Total cash dividends during 2017 were $10,982,000 or $13.55 per share of common stock, an increase of 3.4% per share from $10,478,000 or $13.10 per share in 2016. In 2015, cash dividends totaled $10,157,000 or $12.90 per share. Basic earnings per common share amounts are computed by dividing net income by the weighted average number of common shares outstanding for the period. The following table calculates the basic earnings per common share for the periods indicated. ( net income in thousands 2017 2016 2015 Net Income $ 28,370 $ 29,723 $ 27,392 Weighted Average Number of Common Shares Outstanding 809,834 793,970 786,582 Basic Earnings Per Common Share $ 35.03 $ 37.44 $ 34.82

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2017
Employee Benefit Plans [Abstract]
Employee Benefit Plans	17. Employee Benefit Plans Profit Sharing Plan The Company, through the Bank, sponsors a Profit Sharing Plan for substantially all full-time employees of the Company with one or more years of service. Participants receive up to two annual employer contributions, one is discretionary and the other is mandatory. The discretionary contributions to the Profit Sharing Plan are determined annually by the Board of Directors. The discretionary contributions totaled $1.0 million, $975,000, and $925,000 for the years ended December 31, 2017, 2016, and 2015, respectively. The mandatory contributions to the Profit Sharing Plan are made according to a predetermined set of criteria. Mandatory contributions totaled $1.2 million, $1.2 million, and $1.1 million for the years ended December 31, 2017, 2016, and 2015, respectively. Company employees are permitted, within limitations imposed by tax law, to make pretax contributions and after tax (Roth) contributions to the 401(k) feature of the Profit Sharing Plan. The Company does not match employee contributions within the 401(k) feature of the Profit Sharing Plan and the Company can terminate the Profit Sharing Plan at any time. Benefits pursuant to the Profit Sharing Plan vest 0% during the first year of participation, 25% per full year thereafter and after five years such benefits are fully vested. Executive Retirement Plan and Life Insurance Arrangements The Company, through the Bank, sponsors an Executive Retirement Plan for certain executive level employees. The Executive Retirement Plan is a non-qualified defined contribution plan and was developed to supplement the Company’s Profit Sharing Plan, which, as a qualified retirement plan, has a ceiling on benefits as set by the Internal Revenue Service. The Plan is comprised of: (1) a Performance Component which makes contributions based upon long-term cumulative profitability and increase in market value of the Company; (2) a Salary Component which makes contributions based upon participant salary levels; and (3) an Equity Component for which contributions are discretionary and subject to Board of Directors approval. Executive Retirement Plan contributions are invested in a mix of financial instruments; however, Equity Component contributions are invested primarily in stock of the Company. The Company expensed $4.3 million to the Executive Retirement Plan during the year ended December 31, 2017, $3.8 million during the year ended December 31, 2016 and $3.5 million during the year ended December 31, 2015. The Company’s total accrued liability under the Executive Retirement Plan was $43.3 million as of December 31, 2017 and $37.4 million as of December 31, 2016. All amounts have been fully funded into a Rabbi Trust as of December 31, 2017. The Company has purchased single premium life insurance policies on the lives of certain key employees of the Company. These policies provide: (1) financial protection to the Company in the event of the death of a key employee; and (2) significant income to the Company to offset the expense associated with the Executive Retirement Plan and other employee benefit plans, since the interest earned on the cash surrender value of the policies is tax exempt as long as the policies are used to finance employee benefits. As compensation to each employee for agreeing to allow the Company to purchase an insurance policy on his or her life, split dollar agreements have been entered into with those employees. These agreements provide for a division of the life insurance death proceeds between the Company and each employee’s designated beneficiary or beneficiaries. The Company earned tax-exempt interest on the life insurance policies of $1.8 million for the year ended December 31, 2017, and $1.9 million for the years ended December 31, 2016, and 2015. As of December 31, 2017 and 2016, the total cash surrender value of the insurance policies was $59.6 million and $57.8 million, respectively. Senior Management Retention Plan The Company, through the Bank, sponsors a Senior Management Retention Plan (“SMRP”) for certain senior level employees. The SMRP is a non-qualified defined contribution plan and was developed to supplement the Company’s Profit Sharing Plan, which, as a qualified retirement plan, has a ceiling on benefits as set by the Internal Revenue Service. All contributions are discretionary and subject to the Board of Directors approval. Contributions are invested primarily in stock of the Company. The Company expensed $765,000 to the SMRP during the year ended December 31, 2017, $627,000 during the year ended December 31, 2016 and $530,000 during the year ended December 31, 2015. The Company’s total accrued liability under the SMRP was $4.4 million as of December 31, 2017 and $3.4 million as of December 31, 2016. All amounts have been fully funded into a Rabbi Trust as of December 31, 2017.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2017
Fair Value Measurements [Abstract]
Fair Value Measurements	18. Fair Value Measurements The Company follows the “Fair Value Measurement and Disclosures” topic of the FASB ASC, which establishes a framework for measuring fair value in U.S. GAAP and expands disclosures about fair value measurements. This standard applies whenever other standards require, or permit, assets or liabilities to be measured at fair value but does not expand the use of fair value in any new circumstances. In this standard, the FASB clarifies the principle that fair value should be based on the assumptions market participants would use when pricing the asset or liability. In support of this principle, this standard establishes a fair value hierarchy that prioritizes the information used to develop those assumptions. The fair value hierarchy is as follows: Level 1 inputs – Unadjusted quoted prices in active markets for identical assets or liabilities that the entity has the ability to access at the measurement date. Level 2 inputs - Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar assets and liabilities in active markets, and inputs other than quoted prices that are observable for the asset or liability, such as interest rates and yield curves that are observable at commonly quoted intervals. Level 3 inputs - Unobservable inputs for determining the fair values of assets or liabilities that reflect an entity’s own assumptions about the assumptions that market participants would use in pricing the assets or liabilities. Management monitors the availability of observable market data to assess the appropriate classification of financial instruments within the fair value hierarchy. Changes in economic conditions or model-based valuation techniques may require the transfer of financial instruments from one fair value level to another. In such instances, the transfer is reported at the beginning of the reporting period. Management evaluates the significance of transfers between levels based upon the nature of the financial instrument and size of the transfer relative to total assets, total liabilities or total earnings. Securities classified as available-for-sale are reported at fair value on a recurring basis utilizing Level 1, 2 and 3 inputs. For these securities, the Company obtains fair value measurements from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond's terms and conditions, among other things. The Company does not record all loans & leases at fair value on a recurring basis. However, from time to time, a loan or lease is considered impaired and an allowance for credit losses is established. Once a loan or lease is identified as individually impaired, management measures impairment in accordance with the “Receivable” topic of the FASB ASC. The fair value of impaired loans or leases is estimated using one of several methods, including collateral value when the loan is collateral dependent, market value of similar debt, enterprise value, and discounted cash flows. Impaired loans & leases not requiring an allowance represent loans & leases for which the fair value of the expected repayments or collateral exceed the recorded investments in such loans & leases. Impaired loans & leases where an allowance is established based on the fair value of collateral require classification in the fair value hierarchy. Other Real Estate (“ORE”) is reported at fair value on a non-recurring basis. At December 31, 2017, there were no formal foreclosure proceedings in process for consumer mortgage loans secured by residential real estate properties. The following tables present information about the Company’s assets and liabilities measured at fair value on a recurring basis and indicate the fair value hierarchy of the valuation techniques utilized by the Company to determine such fair value for the periods indicated. (in thousands) Fair Value Total Fair Value Measurements At December 31, 2017, Using Quoted Prices in Active Markets for Identical Assets (Level 1) Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Available-for-Sale Securities: Government Agency & Government-Sponsored Entities $ 3,128 $ - $ 3,128 $ - US Treasury Notes 144,164 144,164 - - US Govt SBA 29,380 - 29,380 - Mortgage Backed Securities 301,914 - 301,914 - Other 3,010 200 310 2,500 Total Assets Measured at Fair Value On a Recurring Basis $ 481,596 $ 144,364 $ 334,732 $ 2,500 (in thousands) Fair Value Total Fair Value Measurements At December 31, 2016, Using Quoted Prices in Active Markets for Identical Assets (Level 1) Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Available-for-Sale Securities: Government Agency & Government-Sponsored Entities $ 3,241 $ - $ 3,241 $ - US Treasury Notes 134,428 134,428 - - US Govt SBA 36,314 36,314 Mortgage Backed Securities 273,270 - 273,270 - Other 1,010 200 310 500 Total Assets Measured at Fair Value On a Recurring Basis $ 448,263 $ 134,628 $ 313,135 $ 500 Fair values for Level 2 available-for-sale investment securities are based on quoted market prices for similar securities. During the year ended December 31, 2017, there were no transfers in or out of level 1, 2, or 3. The available for sale investment security categorized as a Level 3 asset for year ended December 31, 2017 consisted of one $2.5 million investment in a limited liability company that purchases SBA loans. The Company increased this investment by $2.0 million during 2017. This security is not actively traded and is owned by a few investors. The significant unobservable data reflected in the fair value measurement include dealer quotes, projected prepayment speeds/average lives and credit information, among other things. There were no gains or losses or transfers in or out of level 3 during the year ended December 31, 2017. The following tables present information about the Company’s impaired loans & leases and other real estate, classes of assets or liabilities that the Company carries at fair value on a non-recurring basis, and indicates the fair value hierarchy of the valuation techniques utilized by the Company to determine such fair value for the periods indicated. Not all impaired loans & leases are carried at fair value. Impaired loans & leases are only included in the following tables when their fair value is based upon an appraisal of the collateral, and if that appraisal results in a partial charge-off or the establishment of a specific reserve. Fair Value Measurements At December 31, 2017, Using (in thousands) Fair Value Total Quoted Prices in Active Markets for Identical Assets (Level 1) Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Impaired Loans: Commercial Real Estate $ 2,595 $ - $ - $ 2,595 Residential 1st Mortgage 997 - - 997 Home Equity Lines and Loans 75 - - 75 Commercial 1,514 - - 1,514 Total Impaired Loans 5,181 - - 5,181 Other Real Estate: Real Estate Construction 873 - - 873 Total Other Real Estate 873 - - 873 Total Assets Measured at Fair Value On a Non-Recurring Basis $ 6,054 $ - $ - $ 6,054 Fair Value Measurements At December 31, 2016, Using (in thousands) Fair Value Total Quoted Prices in Active Markets for Identical Assets (Level 1) Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Impaired Loans: Residential 1st Mortgage $ 480 $ - $ - $ 480 Home Equity Lines and Loans 83 - - 83 Agricultural 497 - - 497 Commercial 833 - - 833 Total Impaired Loans 1,893 - - 1,893 Other Real Estate: Home Equity Lines and Loans 785 - - 785 Real Estate Construction 2,960 - - 2,960 Total Other Real Estate 3,745 - - 3,745 Total Assets Measured at Fair Value On a Non-Recurring Basis $ 5,638 $ - $ - $ 5,638 The Company’s property appraisals are primarily based on the sales comparison approach and the income approach methodologies, which consider recent sales of comparable properties, including their income generating characteristics, and then make adjustments to reflect the general assumptions that a market participant would make when analyzing the property for purchase. These adjustments may increase or decrease an appraised value and can vary significantly depending on the location, physical characteristics and income producing potential of each property. Additionally, the quality and volume of market information available at the time of the appraisal can vary from period to period and cause significant changes to the nature and magnitude of comparable sale adjustments. Given these variations, comparable sale adjustments are generally not a reliable indicator for how fair value will increase or decrease from period to period. Under certain circumstances, management discounts are applied based on specific characteristics of an individual property. The following table presents quantitative information about Level 3 fair value measurements for financial instruments measured at fair value on a nonrecurring basis at December 31, 2017 (in thousands) Fair Value Valuation Technique Unobservable Inputs Range, Weighted Avg. Impaired Loans: Commercial Real Estate $ 2,595 Income Approach Capitalization Rate 3.25%, 3.25 % Residential 1st Mortgages $ 997 Sales Comparison Approach Adjustment for Difference Between Comparable Sales 1% -4%, 2 % Home Equity Lines and Loans $ 75 Sales Comparison Approach Adjustment for Difference Between Comparable Sales 1% - 2%, 2 % Commercial $ 1,514 Income Approach Capitalization Rate 2.95% - 8.70%, 3.40 % Other Real Estate: Real Estate Construction $ 873 Sales Comparison Approach Adjustment for Difference Between Comparable Sales 10%, 10 %

Fair Value of Financial Instrum

Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2017
Fair Value of Financial Instruments [Abstract]
Fair Value of Financial Instruments	19. Fair Value of Financial Instruments U.S. GAAP requires disclosure of fair value information about financial instruments, whether or not recognized on the balance sheet, for which it is practical to estimate that value. The estimated fair value amounts have been determined by the Company using available market information and appropriate valuation methodologies. The use of assumptions and various valuation techniques, as well as the absence of secondary markets for certain financial instruments, will likely reduce the comparability of fair value disclosures between financial institutions. In some cases, book value is a reasonable estimate of fair value due to the relatively short period of time between origination of the instrument and its expected realization. The following tables summarize the book value and estimated fair value of financial instruments for the periods indicated: Fair Value of Financial Instruments Using December 31, 2017 (in thousands) Carrying Amount Quoted Prices in Active Markets for Identical Assets (Level 1) Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Estimatd Fair Value Assets: Cash and Cash Equivalents $ 187,149 $ 187,149 $ - $ - $ 187,149 Investment Securities Available-for-Sale 481,596 29,580 449,516 2,500 481,596 Investment Securities Held-to-Maturity 54,460 - 38,492 16,744 55,236 FHLB Stock 10,342 N/A N/A N/A N/A Loans & Leases, Net of Deferred Fees & Allowance 2,164,953 - - 2,137,987 2,137,987 Accrued Interest Receivable 10,999 - 10,999 - 10,999 Liabilities: Deposits 2,723,228 2,247,831 472,671 - 2,720,502 Subordinated Debentures 10,310 - 7,428 - 7,428 Accrued Interest Payable 1,137 - 1,137 - 1,137 Fair Value of Financial Instruments Using December 31, 2016 (in thousands) Carrying Amount Quoted Prices in Active Markets for Identical Assets (Level 1) Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Estimated Fair Value Assets: Cash and Cash Equivalents $ 98,960 $ 98,960 $ - $ - $ 98,960 Investment Securities Available-for-Sale 448,263 134,628 313,135 500 448,263 Investment Securities Held-to-Maturity 58,109 - 40,415 17,993 58,408 FHLB Stock 8,872 N/A N/A N/A N/A Loans & Leases, Net of Deferred Fees & Allowance 2,129,682 - - 2,107,060 2,107,060 Accrued Interest Receivable 10,047 - 10,047 - 10,047 Liabilities: Deposits 2,581,711 2,011,418 569,183 - 2,580,601 Subordinated Debentures 10,310 - 6,578 - 6,578 Accrued Interest Payable 852 - 852 - 852 Fair value estimates presented herein are based on pertinent information available to management as of December 31, 2017 and December 31, 2016. Although management is not aware of any factors that would significantly affect the estimated fair value amounts, such amounts have not been comprehensively revalued for purpose of these financial statements since that date, and; therefore, current estimates of fair value may differ significantly from the amounts presented above. The methods and assumptions used to estimate the fair value of each class of financial instrument listed in the table above are explained below. Cash and Cash Equivalents - The carrying amounts reported in the balance sheet for cash and due from banks, interest-bearing deposits with banks, federal funds sold, and securities purchased under agreements to resell are a reasonable estimate of fair value. All cash and cash equivalents are classified as Level 1. Investment Securities - Fair values for investment securities consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond's terms and conditions, among other things. Based on the available market information the classification level could be 1, 2, or 3. Federal Home Loan Bank Stock - It is not practical to determine the fair value of FHLB stock due to restrictions placed on its transferability. Loans & Leases, Net of Deferred Loan & Lease Fees & Allowance - Fair values of loans & leases are estimated as follows: For variable rate loans that reprice frequently and with no significant change in credit risk, fair values are based on carrying values resulting in a Level 3 classification. Fair values for other loans & leases are estimated using discounted cash flow analyses, using interest rates currently being offered for loans with similar terms to borrowers of similar credit quality resulting in a Level 3 classification. Impaired loans & leases are valued at the lower of cost or fair value as described previously. The methods utilized to estimate the fair value of loans & leases do not necessarily represent an exit price. Deposit Liabilities - The fair values disclosed for demand deposits (e.g., interest and non-interest checking, passbook savings, and certain types of money market accounts) are, by definition, equal to the amount payable on demand at the reporting date (i.e., their carrying amount) resulting in a Level 1 classification. Fair values for fixed-maturity certificates of deposit are estimated using a discounted cash flows calculation that applies interest rates currently being offered on certificates to a schedule of aggregated expected monthly maturities on time deposits resulting in a Level 2 classification. Subordinated Debentures - The fair values of the Company’s Subordinated Debentures are estimated using discounted cash flow analyses based on the current borrowing rates for similar types of borrowing arrangements resulting in a Level 2 classification. Accrued Interest Receivable and Payable - The carrying amount of accrued interest receivable and payable approximates their fair value resulting in a Level 2 classification.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies [Abstract]
Commitments and Contingencies	20. Commitments and Contingencies In the normal course of business, the Company enters in to financial instruments with off balance sheet risk in order to meet the financing needs of its customers and to reduce its own exposure to fluctuations in interest rates. These instruments include commitments to extend credit, letters of credit, and other types of financial guarantees. The Company had the following off balance sheet commitments as of the dates indicated. (in thousands) December 31, 2017 December 31, 2016 Commitments to Extend Credit $ 735,678 $ 609,653 Letters of Credit 20,061 20,444 Performance Guarantees Under Interest Rate Swap Contracts Entered Into Between Our Borrowing Customers and Third Parties 759 1,835 The Company's exposure to credit loss in the event of nonperformance by the other party with regard to standby letters of credit, undisbursed loan commitments, and financial guarantees is represented by the contractual notional amount of those 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. The Company uses the same credit policies in making commitments and conditional obligations as it does for recorded balance sheet items. The Company may or may not require collateral or other security to support financial instruments with credit risk. Evaluations of each customer's creditworthiness are performed on a case-by-case basis. Standby letters of credit are conditional commitments issued by the Company to guarantee performance of or payment for a customer to a third party. Outstanding standby letters of credit have maturity dates ranging from 1 to 60 months with final expiration in January 2023. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. The Company is obligated under a number of noncancellable operating leases for premises and equipment used for banking purposes. Minimum future rental commitments under noncancellable operating leases as of December 31, 2017, were $670,000, $ ,000, 644 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 in relation to the financial position of the Company. The Company may be required to maintain average reserves on deposit with the Federal Reserve Bank primarily based on deposits outstanding. There were no reserve requirements during 2017 or 2016.

Recent Accounting Developments

Recent Accounting Developments	12 Months Ended
	Dec. 31, 2017
Recent Accounting Developments [Abstract]
Recent Accounting Developments	21. Recent Accounting Developments In January 2016, the FASB issued ASU 2016-01, Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The ASU will require the earlier recognition of credit losses on loans and other financial instruments based on an expected loss model, replacing the incurred loss model that is currently in use. Under the new guidance, an entity will measure all expected credit losses for financial instruments held at the reporting date based on historical experience, current conditions and reasonable and supportable forecasts. The expected loss model will apply to loans and leases, unfunded lending commitments, held-to-maturity debt securities and other debt instruments measured at amortized cost. The impairment model for available-for-sale debt securities will require the recognition of credit losses through a valuation allowance when fair value is less than amortized cost, regardless of whether the impairment is considered to be other-than-temporary. The new guidance is effective on January 1, 2020, with early adoption permitted on January 1, 2019. The Company is currently In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) . The new standard is being issued to increase the transparency and comparability around lease obligations. Previously unrecorded off-balance sheet obligations will now be brought more prominently to light by presenting lease liabilities on the face of the balance sheet, accompanied by enhanced qualitative and quantitative disclosures in the notes to the financial statements. In August 2015, the FASB issued ASU 2015-14, which deferred the effective date of ASU 2014-09, Revenue from Contracts with Customers (Topic 606). As a result of the deferral, the guidance in ASU 2014-09 will be effective for the Company for reporting periods beginning after December 15, 2017. The Update modifies the guidance companies use to recognize revenue from contracts with customers for transfers of goods or services and transfers of nonfinancial assets, unless those contracts are within the scope of other standards. The guidance also requires new qualitative and quantitative disclosures, including information about contract balances and performance obligations.

Parent Company Financial Inform

Parent Company Financial Information	12 Months Ended
	Dec. 31, 2017
Parent Company Financial Information [Abstract]
Parent Company Financial Information	22. Parent Company Financial Information The following financial information is presented as of December 31 for the periods indicated. Farmers & Merchants Bancorp Condensed Balance Sheets (in thousands) 2017 2016 Cash $ 332 $ 228 Investment in Farmers & Merchants Bank of Central California 297,643 289,778 Investment Securities 409 409 Other Assets 12,006 184 Total Assets $ 310,390 $ 290,599 Subordinated Debentures $ 10,310 $ 10,310 Liabilities 420 308 Shareholders' Equity 299,660 279,981 Total Liabilities and Shareholders' Equity $ 310,390 $ 290,599 Farmers & Merchants Bancorp Condensed Statements of Income Year Ended December 31, (in thousands) 2017 2016 2015 Equity in Undistributed Earnings in Farmers & Merchants Bank of Central California $ 5,575 $ 17,043 $ 17,352 Dividends from Subsidiary 23,575 14,275 10,875 Interest Income 13 11 10 Other Expenses, Net (1,552 ) (2,485 ) (1,451 ) Tax Benefit 759 879 606 Net Income $ 28,370 $ 29,723 $ 27,392 Farmers & Merchants Bancorp Condensed Statements of Cash Flows Year Ended December 31, (in thousands) 2017 2016 2015 Cash Flows from Operating Activities: Net Income $ 28,370 $ 29,723 $ 27,392 Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities: Equity in Undistributed Net Earnings from Subsidiary (5,575 ) (17,043 ) (17,352 ) Net (Increase) Decrease in Other Assets (11,822 ) (124 ) (79 ) Net Increase (Decrease) in Liabilities 112 49 141 Net Cash Provided by Operating Activities 11,085 12,605 10,102 Investing Activities: Securities Sold or Matured 1 - - Payments for Business Acquisition - (2,207 ) - Payments for Investments in Subsidiaries (2,953 ) (2,586 ) (3,360 ) Net Cash Used by Investing Activities (2,952 ) (4,793 ) (3,360 ) Financing Activities: Issuance of Common Stock 2,953 2,586 3,360 Cash Dividends (10,982 ) (10,478 ) (10,157 ) Net Cash Used By Financing Activities (8,029 ) (7,892 ) (6,797 ) Increase (Decrease) in Cash and Cash Equivalents 104 (80 ) (55 ) Cash and Cash Equivalents at Beginning of Year 228 308 363 Cash and Cash Equivalents at End of Year $ 332 $ 228 $ 308

Quarterly Unaudited Financial D

Quarterly Unaudited Financial Data	12 Months Ended
	Dec. 31, 2017
Quarterly Unaudited Financial Data [Abstract]
Quarterly Unaudited Financial Data	23. Quarterly Unaudited Financial Data The following tables set forth certain unaudited historical quarterly financial data for each of the eight consecutive quarters in 2017 and 2016. This information is derived from unaudited consolidated financial statements that include, in management’s opinion, all adjustments (consisting of normal recurring adjustments) necessary for a fair presentation when read in conjunction with the consolidated financial statements and notes thereto included elsewhere in this Form 10-K. 2017 (in thousands except per share data) First Quarter Second Quarter Third Quarter Fourth Quarter Total Total Interest Income $ 27,242 $ 28,069 $ 29,609 $ 29,692 $ 114,612 Total Interest Expense 1,376 1,538 1,759 1,616 6,289 Net Interest Income 25,866 26,531 27,850 28,076 108,323 Provision for Credit Losses 600 650 1,600 - 2,850 Net Interest Income After Provision for Credit Losses 25,266 25,881 26,250 28,076 105,473 Total Non-Interest Income 5,406 3,539 3,638 4,179 16,762 Total Non-Interest Expense 18,422 16,525 16,307 16,500 67,754 Income Before Income Taxes 12,250 12,895 13,581 15,755 54,481 Provision for Income Taxes 4,429 4,708 5,000 11,974 26,111 Net Income $ 7,821 $ 8,187 $ 8,581 $ 3,781 $ 28,370 Basic Earnings Per Common Share $ 9.68 $ 10.12 $ 10.59 $ 4.64 $ 35.03 2016 (in thousands except per share data) First Quarter Second Quarter Third Quarter Fourth Quarter Total Total Interest Income $ 24,026 $ 24,314 $ 25,262 $ 25,664 $ 99,266 Total Interest Expense 920 951 1,110 1,215 4,196 Net Interest Income 23,106 23,363 24,152 24,449 95,070 Provision for Credit Losses 2,600 - 250 3,485 6,335 Net Interest Income After Provision for Credit Losses 20,506 23,363 23,902 20,964 88,735 Total Non-Interest Income 2,721 2,875 4,553 5,108 15,257 Total Non-Interest Expense 12,019 14,737 16,414 15,002 58,172 Income Before Income Taxes 11,208 11,501 12,041 11,070 45,820 Provision for Income Taxes 4,036 4,169 4,503 3,389 16,097 Net Income $ 7,172 $ 7,332 $ 7,538 $ 7,681 $ 29,723 Basic Earnings Per Common Share $ 9.06 $ 9.25 $ 9.51 $ 9.62 $ 37.44

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	24. Subsequent Events On February 27, 2018 the Company acquired an additional 8 shares of Bank of Rio Vista for $95,200, increasing our total ownership to 1,586 shares, or 39.65% of the total common shares outstanding.

Significant Accounting Polici33

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Significant Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying consolidated financial statements and notes thereto have been prepared in accordance with accounting principles generally accepted in the United States of America for financial information. The accompanying consolidated financial statements include the accounts of the Company and the Company’s wholly owned subsidiaries, F & M Bancorp, Inc. and the Bank, along with the Bank’s wholly owned subsidiaries, Farmers & Merchants Investment Corporation and Farmers/Merchants Corp. Significant inter-company transactions have been eliminated in consolidation. The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates. Certain amounts in the prior years' financial statements and related footnote disclosures have been reclassified to conform to the current-year presentation. These reclassifications had no effect on previously reported net income or total shareholders’ equity.
Cash and Cash Equivalents	Cash and Cash Equivalents For purposes of the Consolidated Statements of Cash Flows, the Company has defined cash and cash equivalents as those amounts included in the balance sheet captions Cash and Due from Banks, Interest Bearing Deposits with Banks, Federal Funds Sold and Securities Purchased Under Agreements to Resell. For these instruments, the carrying amount is a reasonable estimate of fair value.
Investment Securities	Investment Securities Investment securities are classified at the time of purchase as held-to-maturity (“HTM”) if it is management’s intent and the Company has the ability to hold the securities until maturity. These securities are carried at cost, adjusted for amortization of premium and accretion of discount using a level yield of interest over the estimated remaining period until maturity. Losses, reflecting a decline in value judged by the Company to be other than temporary, are recognized in the period in which they occur. Securities are classified as available-for-sale (“AFS”) if it is management’s intent, at the time of purchase, to hold the securities for an indefinite period of time and/or to use the securities as part of the Company’s asset/liability management strategy. These securities are reported at fair value with aggregate unrealized gains or losses excluded from income and included as a separate component of shareholders’ equity, net of related income taxes. Fair values are based on quoted market prices or broker/dealer price quotations on a specific identification basis. Gains or losses on the sale of these securities are computed using the specific identification method. Trading securities, if any, are acquired for short-term appreciation and are recorded in a trading portfolio and are carried at fair value, with unrealized gains and losses recorded in non-interest income. Management evaluates securities for other-than-temporary impairment (“OTTI”) on at least a quarterly basis, and more frequently when economic or market conditions warrant such an evaluation. For securities in an unrealized loss position, management considers the extent and duration of the unrealized loss, and the financial condition and near-term prospects of the issuer. 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 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 & Leases	Loans & Leases Loans & leases are reported at the principal amount outstanding net of unearned discounts and deferred loan & lease fees and costs. Interest income on loans & leases is accrued daily on the outstanding balances using the simple interest method. Loan & lease origination fees are deferred and recognized over the contractual life of the loan or lease as an adjustment to the yield. Loans & leases are placed on non-accrual status when the collection of principal or interest is in doubt or when they become past due for 90 days or more unless they are both well-secured and in the process of collection. For this purpose, a loan or lease is considered well-secured if it is collateralized by property having a net realizable value in excess of the amount of the loan or lease or is guaranteed by a financially capable party. When a loan or lease is placed on non-accrual status, the accrued and unpaid interest receivable is reversed and charged against current income; thereafter, interest income is recognized only as it is collected in cash. Additionally, cash would be applied to principal if all principal was not expected to be collected. Loans & leases placed on non-accrual status are returned to accrual status when the loans or leases are paid current as to principal and interest and future payments are expected to be made in accordance with the contractual terms of the loan or lease. A loan or lease 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 original agreement. Impaired loans & leases are either: (1) non-accrual loans & leases; or (2) restructured loans & leases that are still accruing interest. Loans or leases determined to be impaired are individually evaluated for impairment. When a loan or lease is impaired, the Company measures impairment based on the present value of expected future cash flows discounted at the loan or lease's effective interest rate, except that as a practical expedient, it may measure impairment based on a loan or lease's observable market price, or the fair value of the collateral if the loan or lease is collateral dependent. A loan or lease is collateral dependent if the repayment of the loan or lease is expected to be provided solely by the underlying collateral. A restructuring of a loan or lease constitutes a troubled debt restructuring (TDR) if the Company for economic or legal reasons related to the borrower’s (the term “borrower” is used herein to describe a customer who has entered into either a loan or lease transaction) financial difficulties grants a concession to the borrower that it would not otherwise consider. Restructured loans & leases typically present an elevated level of credit risk as the borrowers are not able to perform according to the original contractual terms. If the restructured loan or lease was current on all payments at the time of restructure and management reasonably expects the borrower will continue to perform after the restructure, management may keep the loan or lease on accrual. Loans & leases that are on nonaccrual status at the time they become TDR, remain on nonaccrual status until the borrower demonstrates a sustained period of performance, which the Company generally believes to be six consecutive months of payments, or equivalent. A loan or lease can be removed from TDR status if it was restructured at a market rate in a prior calendar year and is currently in compliance with its modified terms. However, these loans or leases continue to be classified as impaired and are individually evaluated for impairment as described above. Generally, the Company will not restructure loans or leases for borrowers unless: (1) the existing loan or lease is brought current as to principal and interest payments; and (2) the restructured loan or lease can be underwritten to reasonable underwriting standards. If these standards are not met other actions will be pursued (e.g., foreclosure) to collect outstanding loan or lease amounts. After restructure, a determination is made whether the loan or lease will be kept on accrual status based upon the underwriting and historical performance of the restructured credit.
Allowance for Credit Losses	Allowance for Credit Losses The allowance for credit losses is an estimate of probable incurred credit losses inherent in the Company's loan & lease portfolio as of the balance sheet date. The allowance is established through a provision for credit losses, which is charged to expense. Additions to the allowance are expected to maintain the adequacy of the total allowance after credit losses and loan & lease growth. Credit exposures determined to be uncollectible are charged against the allowance. Cash received on previously charged off amounts is recorded as a recovery to the allowance. The overall allowance consists of three primary components: specific reserves related to impaired loans & leases; general reserves for inherent losses related to loans & leases that are not impaired; and an unallocated component that takes into account the imprecision in estimating and allocating allowance balances associated with macro factors. The determination of the general reserve for loans & leases that are collectively evaluated for impairment is based on estimates made by management, to include, but not limited to, consideration of historical losses by portfolio segment, internal asset classifications, qualitative factors that include economic trends in the Company's service areas, industry experience and trends, geographic concentrations, estimated collateral values, the Company's underwriting policies, the character of the loan & lease portfolio, and probable losses inherent in the portfolio taken as a whole. The Company maintains a separate allowance for each portfolio segment (loan & lease type). These portfolio segments include: (1) commercial real estate; (2) agricultural real estate; (3) real estate construction (including land and development loans); (4) residential 1 st The Company assigns a risk rating to all loans & leases and periodically performs detailed reviews of all such loans & leases over a certain threshold to identify credit risks and assess overall collectability. For smaller balance loans & leases, such as consumer and residential real estate, a credit grade is established at inception, and then updated only when the loan or lease becomes contractually delinquent or when the borrower requests a modification. For larger balance loans, management monitors and analyzes the financial condition of borrowers and guarantors, trends in the industries in which borrowers operate and the fair values of collateral securing these loans & leases. These credit quality indicators are used to assign a risk rating to each individual loan or lease. These risk ratings are also subject to examination by independent specialists engaged by the Company. The risk ratings can be grouped into five major categories, defined as follows: Pass – A pass loan or lease is a strong credit with no existing or known potential weaknesses deserving of management's close attention. Special Mention – A special mention loan or lease has potential weaknesses that deserve management's close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or lease or in the Company's credit position at some future date. Special mention loans & leases are not adversely classified and do not expose the Company to sufficient risk to warrant adverse classification. Substandard – A substandard loan or lease is not adequately protected by the current financial condition and paying capacity of the borrower or the value of the collateral pledged, if any. Loans or leases classified as substandard have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. Well-defined weaknesses include a project's lack of marketability, inadequate cash flow or collateral support, failure to complete construction on time or the project's failure to fulfill economic expectations. Doubtful – Loss – Loans or leases classified as loss are considered uncollectible. Once a loan or lease becomes delinquent and repayment becomes questionable, the Company will address collateral shortfalls with the borrower and attempt to obtain additional collateral. If this is not forthcoming and payment in full is unlikely, the Company will estimate its probable loss and immediately charge-off some or all of the balance. The general reserve component of the allowance for credit losses also consists of reserve factors that are based on management's assessment of the following for each portfolio segment: (1) inherent credit risk; (2) historical losses; and (3) other qualitative factors. These reserve factors are inherently subjective and are driven by the repayment risk associated with each portfolio segment described below: Commercial Real Estate – Commercial real estate mortgage loans are generally considered to possess a higher inherent risk of loss than the Company’s commercial, agricultural and consumer loan types. Adverse economic developments or an overbuilt market impact commercial real estate projects and may result in troubled loans. Trends in vacancy rates of commercial properties impact the credit quality of these loans. High vacancy rates reduce operating revenues and the ability for properties to produce sufficient cash flow to service debt obligations. Real Estate Construction – Real estate construction loans, including land loans, are generally considered to possess a higher inherent risk of loss than the Company’s commercial, agricultural and consumer loan types. A major risk arises from the necessity to complete projects within specified cost and time lines. Trends in the construction industry significantly impact the credit quality of these loans, as demand drives construction activity. In addition, trends in real estate values significantly impact the credit quality of these loans, as property values determine the economic viability of construction projects. Commercial – These loans are generally considered to possess a moderate inherent risk of loss because they are shorter-term; typically made to relationship customers; generally underwritten to existing cash flows of operating businesses; and may be collateralized by fixed assets, inventory and/or accounts receivable. Debt coverage is provided by business cash flows and economic trends influenced by unemployment rates and other key economic indicators are closely correlated to the credit quality of these loans. Agricultural Real Estate and Agricultural – These loans are generally considered to possess a moderate inherent risk of loss since they are typically made to relationship customers and are secured by crop production, livestock and related real estate. These loans are vulnerable to two risk factors that are largely outside the control of Company and borrowers: commodity prices and weather conditions. Leases – Equipment leases are generally considered to possess a moderate inherent risk of loss. As lessor, the Company is subject to both the credit risk of the borrower and the residual value risk of the equipment. Credit risks are underwritten using the same credit criteria the Company would use when making an equipment term loan. Residual value risk is managed through the use of qualified, independent appraisers that establish the residual values the Company uses in structuring a lease. Residential 1st Mortgages and Home Equity Lines and Loans – These loans are generally considered to possess a low inherent risk of loss, although this is not always true as evidenced by the correction in residential real estate values that occurred between 2007 and 2012. The degree of risk in residential real estate lending depends primarily on the loan amount in relation to collateral value, the interest rate and the borrower's ability to repay in an orderly fashion. Economic trends determined by unemployment rates and other key economic indicators are closely correlated to the credit quality of these loans. Weak economic trends indicate that the borrowers' capacity to repay their obligations may be deteriorating. Consumer & Other – A consumer installment loan portfolio is usually comprised of a large number of small loans scheduled to be amortized over a specific period. Most installment loans are made for consumer purchases. Economic trends determined by unemployment rates and other key economic indicators are closely correlated to the credit quality of these loans. Weak economic trends indicate that the borrowers' capacity to repay their obligations may be deteriorating. At least quarterly, the Board of Directors reviews the adequacy of the allowance, including consideration of the relative risks in the portfolio, current economic conditions and other factors. If the Board of Directors and management determine that changes are warranted based on those reviews, the allowance is adjusted. In addition, the Company's and Bank's regulators, including the Federal Reserve Board (“FRB”), the California Department of Business Oversight (“DBO”) and the Federal Deposit Insurance Corporation (“FDIC”), as an integral part of their examination process, review the adequacy of the allowance. These regulatory agencies may require additions to the allowance based on their judgment about information available at the time of their examinations.
Acquired Loans	Acquired Loans Loans acquired through purchase or through a business combination are recorded at their fair value at the acquisition date. Credit discounts, which reflect estimates of credit losses, expected to be incurred over the life of the loan, are included in the determination of fair value; therefore, an allowance for loan losses is not recorded at the acquisition date.
Allowance for Credit Losses on Off-Balance-Sheet Credit Exposures	Allowance for Credit Losses on Off-Balance-Sheet Credit Exposures The Company also maintains a separate allowance for off-balance-sheet commitments. Management estimates anticipated losses using historical data and utilization assumptions. The allowance for off-balance-sheet commitments is included in Interest Payable and Other Liabilities on the Company’s Consolidated Balance Sheet.
Premises and Equipment	Premises and Equipment Premises, equipment, and leasehold improvements are stated at cost, less accumulated depreciation and amortization. Depreciation is computed principally by the straight-line method over the estimated useful lives of the assets. Estimated useful lives of buildings range from 30 to 40 years, and for furniture and equipment from 3 to 7 years. Leasehold improvements are amortized over the lesser of the terms of the respective leases, or their useful lives, which are generally 5 to 10 years. Remodeling and capital improvements are capitalized while maintenance and repairs are charged directly to occupancy expense.
Other Real Estate	Other Real Estate Other real estate, which is included in other assets, is expected to be sold and is comprised of properties no longer utilized for business operations and property acquired through foreclosure in satisfaction of indebtedness. These properties are recorded at fair value less estimated selling costs upon acquisition. Revised estimates to the fair value less cost to sell are reported as adjustments to the carrying amount of the asset, provided that such adjusted value is not in excess of the carrying amount at acquisition. Initial losses on properties acquired through full or partial satisfaction of debt are treated as credit losses and charged to the allowance for credit losses at the time of acquisition. Subsequent declines in value from the recorded amounts, routine holding costs, and gains or losses upon disposition, if any, are included in non-interest expense as incurred.
Income Taxes	Income Taxes The Company uses the liability method of accounting for income taxes. This method results in the recognition of deferred tax assets and liabilities that 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. As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes. The deferred provision for income taxes is the result of the net change in the deferred tax asset and deferred tax liability balances during the year. This amount combined with the current taxes payable or refundable results in the income tax expense for the current year. The Company follows the standards set forth in the “Income Taxes” topic of the Financial Accounting Standards Board (“FASB”) Accounting Standard Codification (“ASC”), which clarifies the accounting for uncertainty in income taxes recognized in an enterprise’s financial statements. This standard prescribes a recognition threshold and measurement standard for the financial statement recognition and measurement of an income tax position taken or expected to be taken in a tax return. It also provides guidance on derecognition, classification, interest and penalties, accounting in interim periods, disclosure, and transition. The Company accounts for leases with Investment Tax Credits (ITC) under the deferred method as established in ASC 740-10. ITC are viewed and accounted for as a reduction of the cost of the related assets and presented as deferred income on the Company’s financial statement. When tax returns are filed, it is highly certain that some positions taken would be sustained upon examination by the taxing authorities, while others are subject to uncertainty about the merits of the position taken or the amount of the position that would be ultimately sustained. The benefit of a tax position is recognized in the financial statements in the period during which, based on all available evidence, management believes it is more likely than not that the position will be sustained upon examination, including the resolution of appeals or litigation processes, if any. Tax positions taken are not offset or aggregated with other positions. Tax positions that meet the more-likely-than-not recognition threshold are measured as the largest amount of tax benefit that is more than 50 percent likely of being realized upon settlement with the applicable taxing authority. The portion of the benefits associated with tax positions taken that exceeds the amount measured as described above is reflected as a liability for unrecognized tax benefits in the accompanying consolidated balance sheet along with any associated interest and penalties that would be payable to the taxing authorities upon examination. Interest expense and penalties associated with unrecognized tax benefits, if any, are included in the provision for income taxes in the Consolidated Statements of Income.
Basic Earnings Per Common Share	Basic Earnings Per Common Share The Company’s common stock is not traded on any exchange. The shares are primarily held by local residents and are not actively traded. Basic earnings per common share amounts are computed by dividing net income by the weighted average number of common shares outstanding for the period. There are no common stock equivalent shares. Therefore, there is no presentation of diluted basic earnings per common share. See Note 16 for additional information.
Segment Reporting	Segment Reporting The “Segment Reporting” topic of the FASB ASC requires that public companies report certain information about operating segments. It also requires that public companies report certain information about their products and services, the geographic areas in which they operate, and their major customers. The Company is a holding company for a community bank, which offers a wide array of products and services to its customers. Pursuant to its banking strategy, emphasis is placed on building relationships with its customers, as opposed to building specific lines of business. As a result, the Company is not organized around discernible lines of business and prefers to work as an integrated unit to customize solutions for its customers, with business line emphasis and product offerings changing over time as needs and demands change. Therefore, the Company only reports one segment.
Low Income Housing Tax Credit Investments (LIHTC)	Low Income Housing Tax Credit Investments (LIHTC) The Company accounts for its interest in LIHTC using the cost method as established in ASC 323-740. As an investor, the Company obtains income tax credits and deductions from the operating losses of these tax credit entities. The income tax credits and deductions are allocated to the investors based on their ownership percentages and are recorded as a reduction of income tax expense (or an increase to income tax benefit) and a reduction of federal income taxes payable.
Comprehensive Income	Comprehensive Income The “Comprehensive Income” topic of the FASB ASC establishes standards for the reporting and display of comprehensive income and its components in the financial statements. Other comprehensive income (loss) refers to revenues, expenses, gains, and losses that U.S. GAAP recognize as changes in value to an enterprise but are excluded from net income. For the Company, comprehensive income includes net income and changes in fair value of its available-for-sale investment securities.
Loss Contingencies	Loss Contingencies Loss contingencies, including claims and legal actions arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated. Management does not believe there now are such matters that will have a material effect on the financial statements.
Business Combinations And Related Matters	Business Combinations And Related Matters Business combinations are accounted for under the acquisition method of accounting in accordance with ASC 805, Business Combinations. Under the acquisition method, the acquiring entity in a business combination recognizes 100 percent of the acquired assets and assumed liabilities, regardless of the percentage owned, at their estimated fair values as of the date of acquisition. Any excess of the fair value over the purchase price of net assets and other identifiable intangible assets acquired is recorded as bargain purchase gain. Assets acquired and liabilities assumed from contingencies must also be recognized at fair value, if the fair value can be determined during the measurement period. Results of operations of an acquired business are included in the statement of operations from the date of acquisition. Acquisition-related costs, including conversion charges, are expensed as incurred. The Company applied this guidance to the acquisition of Delta National Bancorp that was consummated on November 18, 2016. The Company's consolidated financial statements reflect the operations of Delta National Bancorp from November 19, 2016 through December 31, 2016.
Intangible Assets	Intangible Assets Intangible assets are comprised of core deposit intangibles acquired in the Delta National Bancorp acquisition. Intangible assets with definite useful lives are amortized over their respective estimated useful lives. If an event occurs that indicates the carrying amount of an intangible asset may not be recoverable, management reviews the asset for impairment.

Recent Accounting Developments

Recent Accounting Developments (Policies)	12 Months Ended
	Dec. 31, 2017
Recent Accounting Developments [Abstract]
Recent Accounting Developments	In January 2016, the FASB issued ASU 2016-01, Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The ASU will require the earlier recognition of credit losses on loans and other financial instruments based on an expected loss model, replacing the incurred loss model that is currently in use. Under the new guidance, an entity will measure all expected credit losses for financial instruments held at the reporting date based on historical experience, current conditions and reasonable and supportable forecasts. The expected loss model will apply to loans and leases, unfunded lending commitments, held-to-maturity debt securities and other debt instruments measured at amortized cost. The impairment model for available-for-sale debt securities will require the recognition of credit losses through a valuation allowance when fair value is less than amortized cost, regardless of whether the impairment is considered to be other-than-temporary. The new guidance is effective on January 1, 2020, with early adoption permitted on January 1, 2019. The Company is currently In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) . The new standard is being issued to increase the transparency and comparability around lease obligations. Previously unrecorded off-balance sheet obligations will now be brought more prominently to light by presenting lease liabilities on the face of the balance sheet, accompanied by enhanced qualitative and quantitative disclosures in the notes to the financial statements. In August 2015, the FASB issued ASU 2015-14, which deferred the effective date of ASU 2014-09, Revenue from Contracts with Customers (Topic 606). As a result of the deferral, the guidance in ASU 2014-09 will be effective for the Company for reporting periods beginning after December 15, 2017. The Update modifies the guidance companies use to recognize revenue from contracts with customers for transfers of goods or services and transfers of nonfinancial assets, unless those contracts are within the scope of other standards. The guidance also requires new qualitative and quantitative disclosures, including information about contract balances and performance obligations.

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2017
Investment Securities [Abstract]
Amortized Cost, Fair Values, and Unrealized Gains and Losses of Securities Available-For-Sale	The amortized cost, fair values, and unrealized gains and losses of the securities available-for-sale (in thousands) Amortized Gross Unrealized Fair/Book December 31, 2017 Cost Gains Losses Value Government Agency & Government-Sponsored Entities $ 3,080 $ 48 $ - $ 3,128 US Treasury Notes 144,606 - 442 144,164 US Govt SBA 29,559 29 208 29,380 Mortgage Backed Securities (1) 302,502 939 1,527 301,914 Other 3,010 - - 3,010 Total $ 482,757 $ 1,016 $ 2,177 $ 481,596 Amortized Gross Unrealized Fair/Book December 31, 2016 Cost Gains Losses Value Government Agency & Government-Sponsored Entities $ 3,127 $ 114 $ - $ 3,241 US Treasury Notes 134,755 5 332 134,428 US Govt SBA 36,532 42 260 36,314 Mortgage Backed Securities (1) 272,858 1,725 1,313 273,270 Other 1,010 - - 1,010 Total $ 448,282 $ 1,886 $ 1,905 $ 448,263 (1) All Mortgage Backed Securities were issued by an agency or government sponsored entity of the U.S. government.
Book Values, Estimated Fair Values and Unrealized Gains and Losses of Investments Classified as Held-To-Maturity	The book values, estimated fair values and unrealized gains and losses of investments classified as held-to-maturity (in thousands) Book Gross Unrealized Fair December 31, 2017 Value Gains Losses Value Obligations of States and Political Subdivisions $ 54,460 $ 776 $ - $ 55,236 Total $ 54,460 $ 776 $ - $ 55,236 Book Gross Unrealized Fair December 31, 2016 Value Gains Losses Value Obligations of States and Political Subdivisions $ 58,109 $ 339 $ 40 $ 58,408 Total $ 58,109 $ 339 $ 40 $ 58,408
Amortized Cost and Estimated Fair Values of Investment Securities by Contractual Maturity	The amortized cost and estimated fair values of investment securities at December 31, 2017 by contractual maturity are shown in the following tables. (in thousands) Available-for-Sale Held-to-Maturity December 31, 2017 Amortized Cost Fair/Book Value Book Value Fair Value Within One Year $ 113,065 $ 112,989 $ 1,760 $ 1,769 After One Year Through Five Years 30,207 29,979 8,659 8,664 After Five Years Through Ten Years 13,044 12,922 14,155 14,347 After Ten Years 23,939 23,792 29,886 30,456 180,255 179,682 54,460 55,236 Investment Securities Not Due at a Single Maturity Date: Mortgage Backed Securities 302,502 301,914 - - Total $ 482,757 $ 481,596 $ 54,460 $ 55,236
Investments with Gross Unrealized Losses and Market Value Aggregated by Investment Category and Length of Time That Individual Securities Have Been In a Continuous Unrealized Loss Position	The following tables show those investments with gross unrealized losses and their market value aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at the dates indicated. (in thousands) Less Than 12 Months 12 Months or More Total December 31, 2017 Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Securities Available-for-Sale US Treasury Notes $ 94,281 $ 144 $ 49,883 $ 298 $ 144,164 $ 442 US Govt SBA 8,379 51 12,900 157 21,279 208 Mortgage Backed Securities 126,863 932 43,208 595 170,071 1,527 Total $ 229,523 $ 1,127 $ 105,991 $ 1,050 $ 335,514 $ 2,177 Less Than 12 Months 12 Months or More Total December 31, 2016 Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Securities Available-for-Sale US Treasury Notes $ 99,429 $ 332 $ - $ - $ 99,429 $ 332 US Govt SBA 27,483 260 - - 27,483 260 Mortgage Backed Securities 123,157 1,313 - - 123,157 1,313 Total $ 250,069 $ 1,905 $ - $ - $ 250,069 $ 1,905 Securities Held-to-Maturity Obligations of States and Political Subdivisions $ 7,251 $ 40 $ - $ - $ 7,251 $ 40 Total $ 7,251 $ 40 $ - $ - $ 7,251 $ 40
Proceeds from Sales and Calls of Securities	Proceeds from sales and calls of these securities were as follows: (in thousands) Gross Proceeds Gross Gains Gross Losses 2017 $ 7,831 $ 143 $ 12 2016 $ 105,941 $ 250 $ 534 2015 $ 61,335 $ 275 $ -

Loans & Leases (Tables)

Loans & Leases (Tables)	12 Months Ended
	Dec. 31, 2017
Loans & Leases [Abstract]
Schedule of Loans and Leases	Loans & leases as of December 31 consisted of the following: (in thousands) 2017 2016 Commercial Real Estate $ 691,639 $ 674,445 Agricultural Real Estate 499,231 467,685 Real Estate Construction 100,206 176,462 Residential 1st Mortgages 260,751 242,247 Home Equity Lines and Loans 34,525 31,625 Agricultural 273,582 295,325 Commercial 265,703 217,577 Consumer & Other 6,656 6,913 Leases 88,957 70,986 Total Gross Loans & Leases 2,221,250 2,183,265 Less: Unearned Income 5,955 5,664 Subtotal 2,215,295 2,177,601 Less: Allowance for Credit Losses 50,342 47,919 Loans & Leases, Net $ 2,164,953 $ 2,129,682

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2017
Allowance for Credit Losses [Abstract]
Allocation of Allowance for Credit Losses by Portfolio Segment and by Impairment Methodology	The following tables show the allocation of the allowance for credit losses at December 31, 2017 and December 31, 2016 by portfolio segment and by impairment methodology (in thousands) December 31, 2017 Commercial Real Estate Agricultural Real Estate Real Estate Construction Residential 1st Mortgages Home Equity Lines & Loans Agricultural Commercial Consumer & Other Leases Unallocated Total Year-To-Date Allowance for Credit Losses: Beginning Balance- January 1, 2017 $ 11,110 $ 9,450 $ 3,223 $ 865 $ 2,140 $ 7,381 $ 8,515 $ 200 $ 3,586 $ 1,449 $ 47,919 Charge-Offs (109 ) - - (53 ) (3 ) (374 ) - (146 ) - - (685 ) Recoveries 109 - - 40 8 17 8 76 - - 258 Provision (188 ) 2,635 (1,377 ) (37 ) 179 1,135 674 79 (223 ) (27 ) 2,850 Ending Balance- December 31, 2017 $ 10,922 $ 12,085 $ 1,846 $ 815 $ 2,324 $ 8,159 $ 9,197 $ 209 $ 3,363 $ 1,422 $ 50,342 Ending Balance Individually Evaluated for Impairment 366 - - 73 17 - 220 8 - - 684 Ending Balance Collectively Evaluated for Impairment 10,556 12,085 1,846 742 2,307 8,159 8,977 201 3,363 1,422 49,658 Loans & Leases: Ending Balance $ 684,961 $ 499,231 $ 100,206 $ 260,751 $ 34,525 $ 273,582 $ 265,703 $ 6,656 $ 89,680 $ - $ 2,215,295 Ending Balance Individually Evaluated for Impairment 4,822 - - 2,373 340 - 1,734 10 - - 9,279 Ending Balance Collectively Evaluated for Impairment 680,139 499,231 100,206 258,378 34,185 273,582 263,969 6,646 89,680 - 2,206,016 December 31, 2016 Commercial Real Estate Agricultural Real Estate Real Estate Construction Residential 1st Mortgages Home Equity Lines & Loans Agricultural Commercial Consumer & Other Leases Unallocated Total Year-To-Date Allowance for Credit Losses: Beginning Balance- January 1, 2016 $ 10,063 $ 6,881 $ 2,485 $ 789 $ 2,146 $ 6,308 $ 7,836 $ 175 $ 3,294 $ 1,546 $ 41,523 Charge-Offs - - - (21 ) (46 ) - - (105 ) - - (172 ) Recoveries 2 - - 26 103 - 47 55 - - 233 Provision 1,045 2,569 738 71 (63 ) 1,073 632 75 292 (97 ) 6,335 Ending Balance- December 31, 2016 $ 11,110 $ 9,450 $ 3,223 $ 865 $ 2,140 $ 7,381 $ 8,515 $ 200 $ 3,586 $ 1,449 $ 47,919 Ending Balance Individually Evaluated for Impairment - - - 70 18 128 608 7 - - 831 Ending Balance Collectively Evaluated for Impairment 11,110 9,450 3,223 795 2,122 7,253 7,907 193 3,586 1,449 47,088 Loans & Leases: Ending Balance $ 668,046 $ 467,685 $ 176,462 $ 242,247 $ 31,625 $ 295,325 $ 217,577 $ 6,913 $ 71,721 $ - $ 2,177,601 Ending Balance Individually Evaluated for Impairment 1,932 1,304 - 2,126 402 625 4,464 10 - - 10,863 Ending Balance Collectively Evaluated for Impairment 666,114 466,381 176,462 240,121 31,223 294,700 213,113 6,903 71,721 - 2,166,738
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings	The following tables show the loan & lease portfolio allocated by management’s internal risk ratings at December 31, 2017 and December 31, 2016 (in thousands) December 31, 2017 Pass Special Mention Substandard Total Loans Loans & Leases: Commercial Real Estate $ 677,636 $ 6,843 $ 482 $ 684,961 Agricultural Real Estate 488,672 6,529 4,030 499,231 Real Estate Construction 90,728 9,478 - 100,206 Residential 1st Mortgages 259,795 41 915 260,751 Home Equity Lines and Loans 34,476 - 49 34,525 Agricultural 264,425 6,439 2,718 273,582 Commercial 260,565 4,610 528 265,703 Consumer & Other 6,498 - 158 6,656 Leases 87,497 2,183 - 89,680 Total $ 2,170,292 $ 36,123 $ 8,880 $ 2,215,295 December 31, 2016 Pass Special Mention Substandard Total Loans Loans & Leases: Commercial Real Estate $ 659,694 $ 6,817 $ 1,535 $ 668,046 Agricultural Real Estate 464,997 1,384 1,304 467,685 Real Estate Construction 176,462 - - 176,462 Residential 1st Mortgages 241,816 47 384 242,247 Home Equity Lines and Loans 31,558 - 67 31,625 Agricultural 283,525 11,366 434 295,325 Commercial 208,172 6,974 2,431 217,577 Consumer & Other 6,705 - 208 6,913 Leases 71,721 - - 71,721 Total $ 2,144,650 $ 26,588 $ 6,363 $ 2,177,601
Aging Analysis of Loan & Lease Portfolio by Time Past Due	The following tables show an aging analysis of the loan & lease portfolio by the time past due at December 31, 2017 and December 31, 2016 (in thousands) December 31, 2017 30-59 Days Past Due 60-89 Days Past Due 90 Days and Still Accruing Nonaccrual Total Past Due Current Total Loans & Leases Loans & Leases: Commercial Real Estate $ - $ - $ - $ - $ - $ 684,961 $ 684,961 Agricultural Real Estate - - - - - 499,231 499,231 Real Estate Construction - - - - - 100,206 100,206 Residential 1st Mortgages 448 - - - 448 260,303 260,751 Home Equity Lines and Loans 10 - - - 10 34,515 34,525 Agricultural - - - - - 273,582 273,582 Commercial 180 - - - 180 265,523 265,703 Consumer & Other 7 - - - 7 6,649 6,656 Leases - - - - - 89,680 89,680 Total $ 645 $ - $ - $ - $ 645 $ 2,214,650 $ 2,215,295 December 31, 2016 30-59 Days Past Due 60-89 Days Past Due 90 Days and Still Accruing Nonaccrual Total Past Due Current Total Loans & Leases Loans & Leases: Commercial Real Estate $ - $ - $ - $ - $ - $ 668,046 $ 668,046 Agricultural Real Estate - - - 1,304 1,304 466,381 467,685 Real Estate Construction - - - - - 176,462 176,462 Residential 1st Mortgages - - - 95 95 242,152 242,247 Home Equity Lines and Loans - - - - - 31,625 31,625 Agricultural - - - 243 243 295,082 295,325 Commercial - - - 1,425 1,425 216,152 217,577 Consumer & Other 10 - - 7 17 6,896 6,913 Leases - - - - - 71,721 71,721 Total $ 10 $ - $ - $ 3,074 $ 3,084 $ 2,174,517 $ 2,177,601
Impaired Loans & Leases	The following tables show information related to impaired loans & leases at and for the year ended December 31, 2017 and December 31, 2016 (in thousands) December 31, 2017 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized With no related allowance recorded: Commercial Real Estate $ 104 $ 104 $ - $ 107 $ 11 Agricultural Real Estate - - - 488 - Residential 1st Mortgages 911 1,012 - 532 11 Home Equity Lines and Loans - - - 16 - Agricultural - - - 30 - $ 1,015 $ 1,116 $ - $ 1,173 $ 22 With an allowance recorded: Commercial Real Estate $ 2,973 $ 2,961 $ 366 $ 2,999 $ 104 Residential 1st Mortgages 508 571 25 469 16 Home Equity Lines and Loans 73 89 4 74 3 Agricultural - - - 409 21 Commercial 1,741 1,734 220 1,693 59 Consumer & Other 8 9 8 11 - $ 5,303 $ 5,364 $ 623 $ 5,655 $ 203 Total $ 6,318 $ 6,480 $ 623 $ 6,828 $ 225 December 31, 2016 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized With no related allowance recorded: Commercial Real Estate $ 184 $ 184 $ - $ 354 $ 7 Agricultural Real Estate 1,305 1,305 - 569 3 Residential 1st Mortgages 451 504 - 404 10 Home Equity Lines and Loans - - - 181 - Agricultural - - - 144 5 Commercial 3,023 3,023 - 3,053 133 $ 4,963 $ 5,016 $ - $ 4,705 $ 158 With an allowance recorded: Residential 1st Mortgages $ 430 $ 469 $ 21 $ 336 $ 13 Home Equity Lines and Loans 90 97 5 123 4 Agricultural 625 625 128 581 22 Commercial 1,441 1,640 608 1,536 8 Consumer & Other 6 13 6 12 - $ 2,592 $ 2,844 $ 768 $ 2,588 $ 47 Total $ 7,555 $ 7,860 $ 768 $ 7,293 $ 205
Loans & Leases by Class Modified as Troubled Debt Restructured Loans	The following table presents loans by class modified as troubled debt restructured loans for the period ended December 31, 2017 (in thousands) December 31, 2017 Troubled Debt Restructurings Number of Loans Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Residential 1st Mortgages 2 $ 673 $ 630 Home Equity Lines and Loans 1 32 32 Commercial 2 138 138 Consumer & Other 1 9 8 Total 6 $ 852 $ 808 The following table presents loans by class modified as troubled debt restructured loans for the period ended December 31, 2016 (in thousands) December 31, 2016 Troubled Debt Restructurings Number of Loans Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Commercial Real Estate 1 $ 112 $ 112 Residential 1st Mortgages 2 289 281 Home Equity Lines and Loans 2 305 286 Total 5 $ 706 $ 679

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2017
Premises and Equipment [Abstract]
Premises and Equipment	Premises and equipment as of December 31 st (in thousands) 2017 2016 Land and Buildings $ 36,018 $ 37,003 Furniture, Fixtures, and Equipment 20,399 20,196 Leasehold Improvements 3,117 2,439 Subtotal 59,534 59,638 Less: Accumulated Depreciation and Amortization 30,855 30,409 Total $ 28,679 $ 29,229

Time Deposits (Tables)

Time Deposits (Tables)	12 Months Ended
	Dec. 31, 2017
Time Deposits [Abstract]
Time Deposits of $250,000 or More	Time Deposits of $250,000 or more as of December 31 were as follows: (in thousands) 2017 2016 Balance $ 212,574 $ 289,955
Maturities of Time Deposits	At December 31, 2017, the scheduled maturities of time deposits were as follows: Scheduled Maturitie 2018 $ 426,874 2019 30,219 2020 10,317 2021 3,100 2022 4,887 Total $ 475,397

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Taxes [Abstract]
Current and Deferred Income Tax Expense (Benefit)	Current and deferred income tax expense (benefit) provided for the years ended December 31 consisted of the following: (in thousands) 2017 2016 2015 Current Federal $ 9,460 $ 13,101 $ 11,979 State 4,046 4,832 4,446 Total Current 13,056 17,933 16,425 Deferred Federal 11,154 (1,607 ) 383 State 1,451 (229 ) 116 Total Deferred 12,605 (1,836 ) 499 Total Provision for Taxes $ 26,111 $ 16,097 $ 16,924
Total Provision for Income Taxes Reconciliation with Federal Statutory Rate	The total provision for income taxes differs from the federal statutory rate as follows: 2017 2016 2015 (in thousands) Amount Rate Amount Rate Amount Rate Tax Provision at Federal Statutory Rate $ 19,068 35.0 % $ 16,037 35.0 % $ 15,510 35.0 % Interest on Obligations of States and Political Subdivisions exempt from Federal Taxation (617 ) (1.1 %) (675 ) (1.5 %) (711 ) (1.6 %) State and Local Income Taxes, Net of Federal Income Tax Benefit 3,573 6.5 % 2,992 6.5 % 2,966 6.7 % Bank Owned Life Insurance (696 ) (1.3 %) (731 ) (1.6 %) (712 ) (1.6 %) Low-Income Housing Tax Credit (1,546 ) (2.8 %) (1,201 ) (2.6 %) (291 ) (0.7 %) Bargain Purchase Gain - 0.0 % (641 ) (1.4 %) - 0.0 % Deferred Tax Asset Remeasurement 6,256 11.5 % - 0.0 % - 0.0 % Other, Net 73 0.1 % 316 0.7 % 162 0.4 % Total Provision for Taxes $ 26,111 47.9 % $ 16,097 35.1 % $ 16,924 38.2 %
Components of Net Deferred Tax Assets	The components of net deferred tax assets as of December 31 are as follows: The net deferred tax assets are reported in Interest Receivable and Other Assets on the Company's Consolidated Balance Sheet. (in thousands) 2017 2016 Deferred Tax Assets Allowance for Credit Losses $ 14,962 $ 20,260 Accrued Liabilities 7,421 9,807 Deferred Compensation 8,996 14,166 State Franchise Tax 850 1,680 Acquired Net Operating Loss 756 1,135 Fair Value Adjustment on Loans Acquired 242 429 Fair Value Adjustment on ORE Acquired 108 299 Unrealized Loss on Securities Available-for-Sale 373 58 Low-Income Housing Investment 470 366 Other 17 233 Total Deferred Tax Assets $ 34,195 $ 48,433 Deferred Tax Liabilities Premises and Equipment (1,361 ) (1,707 ) Securities Accretion (164 ) (341 ) Leasing Activities (12,389 ) (14,868 ) Core Deposit Intangible Asset (247 ) (398 ) Prepaid (964 ) (314 ) Other (944 ) (494 ) Total Deferred Tax Liabilities (16,069 ) (18,122 ) Net Deferred Tax Assets $ 18,126 $ 30,311

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2017
Shareholders' Equity [Abstract]
Compliance with Regulatory Capital Requirements under Banking Regulations	In addition, the most recent notification from the FDIC categorized the Bank as “well capitalized” under the regulatory framework for prompt corrective action. To be categorized as well capitalized, the Bank must maintain minimum total risk-based, Tier 1 risk-based and Tier 1 leverage ratios as set forth in the following tables. There are no conditions or events since that notification that management believes have changed the Bank’s category. (in thousands) Actual Current Regulatory Capital Requirements Well Capitalized Under Prompt Corrective Action December 31, 2017 Amount Ratio Amount Ratio Amount Ratio Total Bank Capital to Risk Weighted Assets $ 330,041 12.66 % $ 208,552 8.0 % $ 260,691 10.0 % Total Consolidated Capital to Risk Weighted Assets $ 342,210 13.07 % $ 209,532 8.0 % N/A N/A Total Bank Common Equity Tier 1 Capital Ratio $ 297,232 11.40 % $ 117,311 4.5 % $ 169,449 6.5 % Total Consolidated Common Equity Tier 1 Capital Ratio $ 299,401 11.43 % $ 117,862 4.5 % N/A N/A Tier 1 Bank Capital to Risk Weighted Assets $ 297,232 11.40 % $ 156,414 6.0 % $ 208,552 8.0 % Tier 1 Consolidated Capital to Risk Weighted Assets $ 309,250 11.81 % $ 157,150 6.0 % N/A N/A Tier 1 Bank Capital to Average Assets $ 297,232 9.65 % $ 123,178 4.0 % $ 153,972 5.0 % Tier 1 Consolidated Capital to Average Assets $ 309,250 9.99 % $ 123,790 4.0 % N/A N/A (in thousands) Actual Current Regulatory Capital Requirements Well Capitalized Under Prompt Corrective Action December 31, 2016 Amount Ratio Amount Ratio Amount Ratio Total Bank Capital to Risk Weighted Assets $ 319,776 12.79 % $ 199,958 8.0 % $ 249,947 10.0 % Total Consolidated Capital to Risk Weighted Assets $ 319,983 12.80 % $ 199,981 8.0 % N/A N/A Total Bank Common Equity Tier 1 Capital Ratio $ 288,324 11.54 % $ 112,476 4.5 % $ 162,466 6.5 % Total Consolidated Common Equity Tier 1 Capital Ratio $ 278,981 11.16 % $ 112,489 4.5 % N/A N/A Tier 1 Bank Capital to Risk Weighted Assets $ 288,323 11.54 % $ 149,968 6.0 % $ 199,958 8.0 % Tier 1 Consolidated Capital to Risk Weighted Assets $ 288,527 11.54 % $ 149,986 6.0 % N/A N/A Tier 1 Bank Capital to Average Assets $ 288,324 10.08 % $ 114,409 4.0 % $ 143,011 5.0 % Tier 1 Consolidated Capital to Average Assets $ 288,527 10.07 % $ 114,568 4.0 % N/A N/A

Dividends and Basic Earnings 42

Dividends and Basic Earnings Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2017
Dividends and Basic Earnings Per Common Share [Abstract]
Calculation of Basic Earnings per Common Share	The following table calculates the basic earnings per common share for the periods indicated. ( net income in thousands 2017 2016 2015 Net Income $ 28,370 $ 29,723 $ 27,392 Weighted Average Number of Common Shares Outstanding 809,834 793,970 786,582 Basic Earnings Per Common Share $ 35.03 $ 37.44 $ 34.82

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Measurements [Abstract]
Assets and Liabilities Measured at Fair Value on a Recurring Basis	The following tables present information about the Company’s assets and liabilities measured at fair value on a recurring basis and indicate the fair value hierarchy of the valuation techniques utilized by the Company to determine such fair value for the periods indicated. (in thousands) Fair Value Total Fair Value Measurements At December 31, 2017, Using Quoted Prices in Active Markets for Identical Assets (Level 1) Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Available-for-Sale Securities: Government Agency & Government-Sponsored Entities $ 3,128 $ - $ 3,128 $ - US Treasury Notes 144,164 144,164 - - US Govt SBA 29,380 - 29,380 - Mortgage Backed Securities 301,914 - 301,914 - Other 3,010 200 310 2,500 Total Assets Measured at Fair Value On a Recurring Basis $ 481,596 $ 144,364 $ 334,732 $ 2,500 (in thousands) Fair Value Total Fair Value Measurements At December 31, 2016, Using Quoted Prices in Active Markets for Identical Assets (Level 1) Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Available-for-Sale Securities: Government Agency & Government-Sponsored Entities $ 3,241 $ - $ 3,241 $ - US Treasury Notes 134,428 134,428 - - US Govt SBA 36,314 36,314 Mortgage Backed Securities 273,270 - 273,270 - Other 1,010 200 310 500 Total Assets Measured at Fair Value On a Recurring Basis $ 448,263 $ 134,628 $ 313,135 $ 500
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis	The following tables present information about the Company’s impaired loans & leases and other real estate, classes of assets or liabilities that the Company carries at fair value on a non-recurring basis, and indicates the fair value hierarchy of the valuation techniques utilized by the Company to determine such fair value for the periods indicated. Not all impaired loans & leases are carried at fair value. Impaired loans & leases are only included in the following tables when their fair value is based upon an appraisal of the collateral, and if that appraisal results in a partial charge-off or the establishment of a specific reserve. Fair Value Measurements At December 31, 2017, Using (in thousands) Fair Value Total Quoted Prices in Active Markets for Identical Assets (Level 1) Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Impaired Loans: Commercial Real Estate $ 2,595 $ - $ - $ 2,595 Residential 1st Mortgage 997 - - 997 Home Equity Lines and Loans 75 - - 75 Commercial 1,514 - - 1,514 Total Impaired Loans 5,181 - - 5,181 Other Real Estate: Real Estate Construction 873 - - 873 Total Other Real Estate 873 - - 873 Total Assets Measured at Fair Value On a Non-Recurring Basis $ 6,054 $ - $ - $ 6,054 Fair Value Measurements At December 31, 2016, Using (in thousands) Fair Value Total Quoted Prices in Active Markets for Identical Assets (Level 1) Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Impaired Loans: Residential 1st Mortgage $ 480 $ - $ - $ 480 Home Equity Lines and Loans 83 - - 83 Agricultural 497 - - 497 Commercial 833 - - 833 Total Impaired Loans 1,893 - - 1,893 Other Real Estate: Home Equity Lines and Loans 785 - - 785 Real Estate Construction 2,960 - - 2,960 Total Other Real Estate 3,745 - - 3,745 Total Assets Measured at Fair Value On a Non-Recurring Basis $ 5,638 $ - $ - $ 5,638
Quantitative Information about Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on a Non-Recurring Basis	The following table presents quantitative information about Level 3 fair value measurements for financial instruments measured at fair value on a nonrecurring basis at December 31, 2017 (in thousands) Fair Value Valuation Technique Unobservable Inputs Range, Weighted Avg. Impaired Loans: Commercial Real Estate $ 2,595 Income Approach Capitalization Rate 3.25%, 3.25 % Residential 1st Mortgages $ 997 Sales Comparison Approach Adjustment for Difference Between Comparable Sales 1% -4%, 2 % Home Equity Lines and Loans $ 75 Sales Comparison Approach Adjustment for Difference Between Comparable Sales 1% - 2%, 2 % Commercial $ 1,514 Income Approach Capitalization Rate 2.95% - 8.70%, 3.40 % Other Real Estate: Real Estate Construction $ 873 Sales Comparison Approach Adjustment for Difference Between Comparable Sales 10%, 10 %

Fair Value of Financial Instr44

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value of Financial Instruments [Abstract]
Book Value and Estimated Fair Value of Financial Instruments	The following tables summarize the book value and estimated fair value of financial instruments for the periods indicated: Fair Value of Financial Instruments Using December 31, 2017 (in thousands) Carrying Amount Quoted Prices in Active Markets for Identical Assets (Level 1) Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Estimatd Fair Value Assets: Cash and Cash Equivalents $ 187,149 $ 187,149 $ - $ - $ 187,149 Investment Securities Available-for-Sale 481,596 29,580 449,516 2,500 481,596 Investment Securities Held-to-Maturity 54,460 - 38,492 16,744 55,236 FHLB Stock 10,342 N/A N/A N/A N/A Loans & Leases, Net of Deferred Fees & Allowance 2,164,953 - - 2,137,987 2,137,987 Accrued Interest Receivable 10,999 - 10,999 - 10,999 Liabilities: Deposits 2,723,228 2,247,831 472,671 - 2,720,502 Subordinated Debentures 10,310 - 7,428 - 7,428 Accrued Interest Payable 1,137 - 1,137 - 1,137 Fair Value of Financial Instruments Using December 31, 2016 (in thousands) Carrying Amount Quoted Prices in Active Markets for Identical Assets (Level 1) Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Estimated Fair Value Assets: Cash and Cash Equivalents $ 98,960 $ 98,960 $ - $ - $ 98,960 Investment Securities Available-for-Sale 448,263 134,628 313,135 500 448,263 Investment Securities Held-to-Maturity 58,109 - 40,415 17,993 58,408 FHLB Stock 8,872 N/A N/A N/A N/A Loans & Leases, Net of Deferred Fees & Allowance 2,129,682 - - 2,107,060 2,107,060 Accrued Interest Receivable 10,047 - 10,047 - 10,047 Liabilities: Deposits 2,581,711 2,011,418 569,183 - 2,580,601 Subordinated Debentures 10,310 - 6,578 - 6,578 Accrued Interest Payable 852 - 852 - 852

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies [Abstract]
Off Balance Sheet Arrangements	The Company had the following off balance sheet commitments as of the dates indicated. (in thousands) December 31, 2017 December 31, 2016 Commitments to Extend Credit $ 735,678 $ 609,653 Letters of Credit 20,061 20,444 Performance Guarantees Under Interest Rate Swap Contracts Entered Into Between Our Borrowing Customers and Third Parties 759 1,835

Parent Company Financial Info46

Parent Company Financial Information (Tables)	12 Months Ended
	Dec. 31, 2017
Parent Company Financial Information [Abstract]
Condensed Balance Sheets	The following financial information is presented as of December 31 for the periods indicated. Farmers & Merchants Bancorp Condensed Balance Sheets (in thousands) 2017 2016 Cash $ 332 $ 228 Investment in Farmers & Merchants Bank of Central California 297,643 289,778 Investment Securities 409 409 Other Assets 12,006 184 Total Assets $ 310,390 $ 290,599 Subordinated Debentures $ 10,310 $ 10,310 Liabilities 420 308 Shareholders' Equity 299,660 279,981 Total Liabilities and Shareholders' Equity $ 310,390 $ 290,599
Condensed Statements of Income	Farmers & Merchants Bancorp Condensed Statements of Income Year Ended December 31, (in thousands) 2017 2016 2015 Equity in Undistributed Earnings in Farmers & Merchants Bank of Central California $ 5,575 $ 17,043 $ 17,352 Dividends from Subsidiary 23,575 14,275 10,875 Interest Income 13 11 10 Other Expenses, Net (1,552 ) (2,485 ) (1,451 ) Tax Benefit 759 879 606 Net Income $ 28,370 $ 29,723 $ 27,392
Condensed Statements of Cash Flows	Farmers & Merchants Bancorp Condensed Statements of Cash Flows Year Ended December 31, (in thousands) 2017 2016 2015 Cash Flows from Operating Activities: Net Income $ 28,370 $ 29,723 $ 27,392 Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities: Equity in Undistributed Net Earnings from Subsidiary (5,575 ) (17,043 ) (17,352 ) Net (Increase) Decrease in Other Assets (11,822 ) (124 ) (79 ) Net Increase (Decrease) in Liabilities 112 49 141 Net Cash Provided by Operating Activities 11,085 12,605 10,102 Investing Activities: Securities Sold or Matured 1 - - Payments for Business Acquisition - (2,207 ) - Payments for Investments in Subsidiaries (2,953 ) (2,586 ) (3,360 ) Net Cash Used by Investing Activities (2,952 ) (4,793 ) (3,360 ) Financing Activities: Issuance of Common Stock 2,953 2,586 3,360 Cash Dividends (10,982 ) (10,478 ) (10,157 ) Net Cash Used By Financing Activities (8,029 ) (7,892 ) (6,797 ) Increase (Decrease) in Cash and Cash Equivalents 104 (80 ) (55 ) Cash and Cash Equivalents at Beginning of Year 228 308 363 Cash and Cash Equivalents at End of Year $ 332 $ 228 $ 308

Quarterly Unaudited Financial47

Quarterly Unaudited Financial Data (Tables)	12 Months Ended
	Dec. 31, 2017
Quarterly Unaudited Financial Data [Abstract]
Schedule of Quarterly Financial Information	The following tables set forth certain unaudited historical quarterly financial data for each of the eight consecutive quarters in 2017 and 2016. This information is derived from unaudited consolidated financial statements that include, in management’s opinion, all adjustments (consisting of normal recurring adjustments) necessary for a fair presentation when read in conjunction with the consolidated financial statements and notes thereto included elsewhere in this Form 10-K. 2017 (in thousands except per share data) First Quarter Second Quarter Third Quarter Fourth Quarter Total Total Interest Income $ 27,242 $ 28,069 $ 29,609 $ 29,692 $ 114,612 Total Interest Expense 1,376 1,538 1,759 1,616 6,289 Net Interest Income 25,866 26,531 27,850 28,076 108,323 Provision for Credit Losses 600 650 1,600 - 2,850 Net Interest Income After Provision for Credit Losses 25,266 25,881 26,250 28,076 105,473 Total Non-Interest Income 5,406 3,539 3,638 4,179 16,762 Total Non-Interest Expense 18,422 16,525 16,307 16,500 67,754 Income Before Income Taxes 12,250 12,895 13,581 15,755 54,481 Provision for Income Taxes 4,429 4,708 5,000 11,974 26,111 Net Income $ 7,821 $ 8,187 $ 8,581 $ 3,781 $ 28,370 Basic Earnings Per Common Share $ 9.68 $ 10.12 $ 10.59 $ 4.64 $ 35.03 2016 (in thousands except per share data) First Quarter Second Quarter Third Quarter Fourth Quarter Total Total Interest Income $ 24,026 $ 24,314 $ 25,262 $ 25,664 $ 99,266 Total Interest Expense 920 951 1,110 1,215 4,196 Net Interest Income 23,106 23,363 24,152 24,449 95,070 Provision for Credit Losses 2,600 - 250 3,485 6,335 Net Interest Income After Provision for Credit Losses 20,506 23,363 23,902 20,964 88,735 Total Non-Interest Income 2,721 2,875 4,553 5,108 15,257 Total Non-Interest Expense 12,019 14,737 16,414 15,002 58,172 Income Before Income Taxes 11,208 11,501 12,041 11,070 45,820 Provision for Income Taxes 4,036 4,169 4,503 3,389 16,097 Net Income $ 7,172 $ 7,332 $ 7,538 $ 7,681 $ 29,723 Basic Earnings Per Common Share $ 9.06 $ 9.25 $ 9.51 $ 9.62 $ 37.44

Significant Accounting Polici48

Significant Accounting Policies (Details) $ in Thousands	Nov. 18, 2016USD ($)Branch	Dec. 31, 2017USD ($)ComponentCategoryFactorSegment	Dec. 31, 2016USD ($)
Business Acquisition [Line Items]
Assets | $		$ 3,075,452	$ 2,922,121
Investment Securities [Abstract]
Number of components into which amount of impairment is split | Component		2
Loans & Leases [Abstract]
Consecutive months of payments to demonstrate sustained period of performance		6 months
Allowance for Credit Losses [Abstract]
Number of primary components of overall allowance for loan losses | Component		3
Number of categories into which risk ratings are grouped | Category		5
Segment Reporting [Abstract]
Number of reportable segments | Segment		1
Minimum [Member]
Loans & Leases [Abstract]
Period after which loans are placed on non accrual status		90 days
Buildings [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives		30 years
Buildings [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives		40 years
Furniture and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives		3 years
Furniture and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives		7 years
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives		5 years
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives		10 years
Agricultural Real Estate [Member]
Allowance for Credit Losses [Abstract]
Number of risk factors on loans | Factor		2
Agricultural [Member]
Allowance for Credit Losses [Abstract]
Number of risk factors on loans | Factor		2
Delta National Bancorp [Member]
Business Acquisition [Line Items]
Assets | $	$ 112,000
Number of branches | Branch	4

Business Combinations (Details)

Business Combinations (Details) - Delta National Bancorp [Member] $ in Millions	Nov. 18, 2016USD ($)
Business Acquisition [Line Items]
Loans	$ 32.4
Deposits	103.7
Investments	$ 38.7

Investment Securities, Amortize

Investment Securities, Amortized Cost, Fair Values, and Unrealized Gains and Losses of Securities (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		$ 482,757	$ 448,282
Gross unrealized gains		1,016	1,886
Gross unrealized losses		2,177	1,905
Fair/Book value		481,596	448,263
Book values, estimated fair values and unrealized gains and losses of investments classified as held-to-maturity [Abstract]
Book value		54,460	58,109
Gross unrealized gains		776	339
Gross unrealized losses		0	40
Fair value		55,236	58,408
Government Agency & Government-Sponsored Entities [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		3,080	3,127
Gross unrealized gains		48	114
Gross unrealized losses		0	0
Fair/Book value		3,128	3,241
US Treasury Notes [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		144,606	134,755
Gross unrealized gains		0	5
Gross unrealized losses		442	332
Fair/Book value		144,164	134,428
US Govt SBA [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		29,559	36,532
Gross unrealized gains		29	42
Gross unrealized losses		208	260
Fair/Book value		29,380	36,314
Mortgage Backed Securities [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost	[1]	302,502	272,858
Gross unrealized gains	[1]	939	1,725
Gross unrealized losses	[1]	1,527	1,313
Fair/Book value	[1]	301,914	273,270
Other [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		3,010	1,010
Gross unrealized gains		0	0
Gross unrealized losses		0	0
Fair/Book value		3,010	1,010
Obligations of States and Political Subdivisions [Member]
Book values, estimated fair values and unrealized gains and losses of investments classified as held-to-maturity [Abstract]
Book value		54,460	58,109
Gross unrealized gains		776	339
Gross unrealized losses		0	40
Fair value		$ 55,236	$ 58,408
[1]	All Mortgage Backed Securities were issued by an agency or government sponsored entity of the U.S. government.

Investment Securities, Contract

Investment Securities, Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Amortized Cost [Abstract]
Within one year	$ 113,065
After one year through five years	30,207
After five years through ten years	13,044
After ten years	23,939
Amortized cost, excluding securities without single maturity date	180,255
Investment securities not due at a single maturity date, mortgage-backed securities	302,502
Amortized cost	482,757
Fair/Book Value [Abstract]
Within one year	112,989
After one year through five years	29,979
After five years through ten years	12,922
After ten years	23,792
Fair/Book value, excluding securities without single maturity date	179,682
Investment securities not due at a single maturity date, mortgage-backed securities	301,914
Fair/Book value	481,596	$ 448,263
Book Value [Abstract]
Within one year	1,760
After one year through five years	8,659
After five years through ten years	14,155
After ten years	29,886
Book value, excluding securities without single maturity date	54,460
Investment securities not due at a single maturity date, mortgage-backed securities	0
Book value	54,460	58,109
Fair Value [Abstract]
Within one year	1,769
After one year through five years	8,664
After five years through ten years	14,347
After ten years	30,456
Fair/Book value, excluding securities without single maturity date	55,236
Investment securities not due at a single maturity date, mortgage-backed securities	0
Fair value	$ 55,236	$ 58,408

Investment Securities, Securiti

Investment Securities, Securities in Continuous Unrealized Loss Position (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)Security	Dec. 31, 2016USD ($)
Available-for-sale Securities in Continuous Unrealized Loss Position [Abstract]
Less than 12 months fair value	$ 229,523	$ 250,069
Less than 12 months unrealized loss	1,127	1,905
12 months or more fair value	105,991	0
12 months or more unrealized loss	1,050	0
Total fair value	335,514	250,069
Total unrealized loss	$ 2,177	1,905
Number of investment securities held | Security	476
Less than 12 months, number of positions | Security	97
12 months or more, number of positions | Security	98
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months fair value		7,251
Less than 12 months unrealized loss		40
12 months or more fair value		0
12 months or more unrealized loss		0
Total fair value		7,251
Total unrealized loss		40
US Treasury Notes [Member]
Available-for-sale Securities in Continuous Unrealized Loss Position [Abstract]
Less than 12 months fair value	$ 94,281	99,429
Less than 12 months unrealized loss	144	332
12 months or more fair value	49,883	0
12 months or more unrealized loss	298	0
Total fair value	144,164	99,429
Total unrealized loss	$ 442	332
Less than 12 months, number of positions | Security	7
12 months or more, number of positions | Security	2
US Govt SBA [Member]
Available-for-sale Securities in Continuous Unrealized Loss Position [Abstract]
Less than 12 months fair value	$ 8,379	27,483
Less than 12 months unrealized loss	51	260
12 months or more fair value	12,900	0
12 months or more unrealized loss	157	0
Total fair value	21,279	27,483
Total unrealized loss	$ 208	260
Less than 12 months, number of positions | Security	54
12 months or more, number of positions | Security	70
Mortgage Backed Securities [Member]
Available-for-sale Securities in Continuous Unrealized Loss Position [Abstract]
Less than 12 months fair value	$ 126,863	123,157
Less than 12 months unrealized loss	932	1,313
12 months or more fair value	43,208	0
12 months or more unrealized loss	595	0
Total fair value	170,071	123,157
Total unrealized loss	$ 1,527	1,313
Less than 12 months, number of positions | Security	26
12 months or more, number of positions | Security	36
Government Agency & Government-Sponsored Entities [Member]
Available-for-sale Securities in Continuous Unrealized Loss Position [Abstract]
Total unrealized loss	$ 0	0
Less than 12 months, number of positions | Security	0
12 months or more, number of positions | Security	0
Obligations of States and Political Subdivisions [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months fair value		7,251
Less than 12 months unrealized loss		40
12 months or more fair value		0
12 months or more unrealized loss		0
Total fair value		7,251
Total unrealized loss	$ 0	$ 40
Less than 12 months, number of positions | Security	0
12 months or more, number of positions | Security	0
Municipal Bonds [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Percentage of portfolio rated at either issue or issuer level	99.00%
Percentage of portfolio not rated	1.00%

Investment Securities, Proceeds

Investment Securities, Proceeds From Sales (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Proceeds from sales and calls of securities [Abstract]
Gross proceeds	$ 7,831	$ 105,941	$ 61,335
Gross gains	143	250	275
Gross losses	$ 12	$ 534	$ 0

Investment Securities, Pledged

Investment Securities, Pledged Securities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Investment Securities [Abstract]
Securities pledged to secure public deposits, FHLB borrowings, and other government agency deposits as required by law	$ 214.5	$ 171.9

Investment Securities, Investme

Investment Securities, Investment in Unconsolidated Subsidiary (Details) - Voting Shares of Bank of Rio Vista [Member] - USD ($) $ in Millions	Jul. 20, 2017	Apr. 05, 2017
Schedule of Cost-method Investments [Line Items]
Percentage of voting shares acquired		4.90%
Percentage of additional voting shares acquired	34.55%
Payments to acquire business	$ 10.5	$ 1.4

Federal Home Loan Bank Stock 56

Federal Home Loan Bank Stock and Other Equity Securities, at Cost (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Federal Home Loan Bank Stock and Other Equity Securities, at Cost [Abstract]
FHLB stock and other equity securities	$ 22.6	$ 9.2

Loans & Leases (Details)

Loans & Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Loans and Leases Receivable Disclosure [Line Items]
Total Gross Loans & Leases	$ 2,221,250	$ 2,183,265
Less: Unearned Income	5,955	5,664
Total Loans & Leases	2,215,295	2,177,601
Less: Allowance for Credit Losses	50,342	47,919	$ 41,523
Loans & Leases, Net	2,164,953	2,129,682
Collateral on borrowing lines	618,400
Federal Home Loan Bank [Member]
Loans and Leases Receivable Disclosure [Line Items]
Collateral on borrowing lines	618,400
Maximum borrowing capacity	521,200
Federal Reserve Bank [Member]
Loans and Leases Receivable Disclosure [Line Items]
Collateral on borrowing lines	568,600
Maximum borrowing capacity	381,400
Commercial Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Gross Loans & Leases	691,639	674,445
Total Loans & Leases	684,961	668,046
Less: Allowance for Credit Losses	10,922	11,110	10,063
Agricultural Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Gross Loans & Leases	499,231	467,685
Total Loans & Leases	499,231	467,685
Less: Allowance for Credit Losses	12,085	9,450	6,881
Real Estate Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Gross Loans & Leases	100,206	176,462
Total Loans & Leases	100,206	176,462
Less: Allowance for Credit Losses	1,846	3,223	2,485
Residential 1st Mortgages [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Gross Loans & Leases	260,751	242,247
Total Loans & Leases	260,751	242,247
Less: Allowance for Credit Losses	815	865	789
Home Equity Lines and Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Gross Loans & Leases	34,525	31,625
Total Loans & Leases	34,525	31,625
Less: Allowance for Credit Losses	2,324	2,140	2,146
Agricultural [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Gross Loans & Leases	273,582	295,325
Total Loans & Leases	273,582	295,325
Less: Allowance for Credit Losses	8,159	7,381	6,308
Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Gross Loans & Leases	265,703	217,577
Total Loans & Leases	265,703	217,577
Less: Allowance for Credit Losses	9,197	8,515	7,836
Consumer & Other [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Gross Loans & Leases	6,656	6,913
Total Loans & Leases	6,656	6,913
Less: Allowance for Credit Losses	209	200	175
Leases [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Gross Loans & Leases	88,957	70,986
Total Loans & Leases	89,680	71,721
Less: Allowance for Credit Losses	$ 3,363	$ 3,586	$ 3,294

Allowance for Credit Losses, Al

Allowance for Credit Losses, Allocation of The Allowance For Loan Losses by Portfolio Segment and By Impairment Methodology (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
Allowance for Credit Losses [Roll Forward]
Beginning Balance				$ 47,919				$ 41,523	$ 47,919	$ 41,523
Charge-Offs									(685)	(172)
Recoveries									258	233
Provision	$ 0	$ 1,600	$ 650	600	$ 3,485	$ 250	$ 0	2,600	2,850	6,335	$ 750
Ending Balance	50,342				47,919				50,342	47,919	41,523
Ending Balance Individually Evaluated for Impairment	684				831				684	831
Ending Balance Collectively Evaluated for Impairment	49,658				47,088				49,658	47,088
Loans & Leases [Abstract]
Ending Balance	2,215,295				2,177,601				2,215,295	2,177,601
Ending Balance Individually Evaluated for Impairment	9,279				10,863				9,279	10,863
Ending Balance Collectively Evaluated for Impairment	2,206,016				2,166,738				2,206,016	2,166,738
Commercial Real Estate [Member]
Allowance for Credit Losses [Roll Forward]
Beginning Balance				11,110				10,063	11,110	10,063
Charge-Offs									(109)	0
Recoveries									109	2
Provision									(188)	1,045
Ending Balance	10,922				11,110				10,922	11,110	10,063
Ending Balance Individually Evaluated for Impairment	366				0				366	0
Ending Balance Collectively Evaluated for Impairment	10,556				11,110				10,556	11,110
Loans & Leases [Abstract]
Ending Balance	684,961				668,046				684,961	668,046
Ending Balance Individually Evaluated for Impairment	4,822				1,932				4,822	1,932
Ending Balance Collectively Evaluated for Impairment	680,139				666,114				680,139	666,114
Agricultural Real Estate [Member]
Allowance for Credit Losses [Roll Forward]
Beginning Balance				9,450				6,881	9,450	6,881
Charge-Offs									0	0
Recoveries									0	0
Provision									2,635	2,569
Ending Balance	12,085				9,450				12,085	9,450	6,881
Ending Balance Individually Evaluated for Impairment	0				0				0	0
Ending Balance Collectively Evaluated for Impairment	12,085				9,450				12,085	9,450
Loans & Leases [Abstract]
Ending Balance	499,231				467,685				499,231	467,685
Ending Balance Individually Evaluated for Impairment	0				1,304				0	1,304
Ending Balance Collectively Evaluated for Impairment	499,231				466,381				499,231	466,381
Real Estate Construction [Member]
Allowance for Credit Losses [Roll Forward]
Beginning Balance				3,223				2,485	3,223	2,485
Charge-Offs									0	0
Recoveries									0	0
Provision									(1,377)	738
Ending Balance	1,846				3,223				1,846	3,223	2,485
Ending Balance Individually Evaluated for Impairment	0				0				0	0
Ending Balance Collectively Evaluated for Impairment	1,846				3,223				1,846	3,223
Loans & Leases [Abstract]
Ending Balance	100,206				176,462				100,206	176,462
Ending Balance Individually Evaluated for Impairment	0				0				0	0
Ending Balance Collectively Evaluated for Impairment	100,206				176,462				100,206	176,462
Residential 1st Mortgages [Member]
Allowance for Credit Losses [Roll Forward]
Beginning Balance				865				789	865	789
Charge-Offs									(53)	(21)
Recoveries									40	26
Provision									(37)	71
Ending Balance	815				865				815	865	789
Ending Balance Individually Evaluated for Impairment	73				70				73	70
Ending Balance Collectively Evaluated for Impairment	742				795				742	795
Loans & Leases [Abstract]
Ending Balance	260,751				242,247				260,751	242,247
Ending Balance Individually Evaluated for Impairment	2,373				2,126				2,373	2,126
Ending Balance Collectively Evaluated for Impairment	258,378				240,121				258,378	240,121
Home Equity Lines and Loans [Member]
Allowance for Credit Losses [Roll Forward]
Beginning Balance				2,140				2,146	2,140	2,146
Charge-Offs									(3)	(46)
Recoveries									8	103
Provision									179	(63)
Ending Balance	2,324				2,140				2,324	2,140	2,146
Ending Balance Individually Evaluated for Impairment	17				18				17	18
Ending Balance Collectively Evaluated for Impairment	2,307				2,122				2,307	2,122
Loans & Leases [Abstract]
Ending Balance	34,525				31,625				34,525	31,625
Ending Balance Individually Evaluated for Impairment	340				402				340	402
Ending Balance Collectively Evaluated for Impairment	34,185				31,223				34,185	31,223
Agricultural [Member]
Allowance for Credit Losses [Roll Forward]
Beginning Balance				7,381				6,308	7,381	6,308
Charge-Offs									(374)	0
Recoveries									17	0
Provision									1,135	1,073
Ending Balance	8,159				7,381				8,159	7,381	6,308
Ending Balance Individually Evaluated for Impairment	0				128				0	128
Ending Balance Collectively Evaluated for Impairment	8,159				7,253				8,159	7,253
Loans & Leases [Abstract]
Ending Balance	273,582				295,325				273,582	295,325
Ending Balance Individually Evaluated for Impairment	0				625				0	625
Ending Balance Collectively Evaluated for Impairment	273,582				294,700				273,582	294,700
Commercial [Member]
Allowance for Credit Losses [Roll Forward]
Beginning Balance				8,515				7,836	8,515	7,836
Charge-Offs									0	0
Recoveries									8	47
Provision									674	632
Ending Balance	9,197				8,515				9,197	8,515	7,836
Ending Balance Individually Evaluated for Impairment	220				608				220	608
Ending Balance Collectively Evaluated for Impairment	8,977				7,907				8,977	7,907
Loans & Leases [Abstract]
Ending Balance	265,703				217,577				265,703	217,577
Ending Balance Individually Evaluated for Impairment	1,734				4,464				1,734	4,464
Ending Balance Collectively Evaluated for Impairment	263,969				213,113				263,969	213,113
Consumer & Other [Member]
Allowance for Credit Losses [Roll Forward]
Beginning Balance				200				175	200	175
Charge-Offs									(146)	(105)
Recoveries									76	55
Provision									79	75
Ending Balance	209				200				209	200	175
Ending Balance Individually Evaluated for Impairment	8				7				8	7
Ending Balance Collectively Evaluated for Impairment	201				193				201	193
Loans & Leases [Abstract]
Ending Balance	6,656				6,913				6,656	6,913
Ending Balance Individually Evaluated for Impairment	10				10				10	10
Ending Balance Collectively Evaluated for Impairment	6,646				6,903				6,646	6,903
Leases [Member]
Allowance for Credit Losses [Roll Forward]
Beginning Balance				3,586				3,294	3,586	3,294
Charge-Offs									0	0
Recoveries									0	0
Provision									(223)	292
Ending Balance	3,363				3,586				3,363	3,586	3,294
Ending Balance Individually Evaluated for Impairment	0				0				0	0
Ending Balance Collectively Evaluated for Impairment	3,363				3,586				3,363	3,586
Loans & Leases [Abstract]
Ending Balance	89,680				71,721				89,680	71,721
Ending Balance Individually Evaluated for Impairment	0				0				0	0
Ending Balance Collectively Evaluated for Impairment	89,680				71,721				89,680	71,721
Unallocated [Member]
Allowance for Credit Losses [Roll Forward]
Beginning Balance				$ 1,449				$ 1,546	1,449	1,546
Charge-Offs									0	0
Recoveries									0	0
Provision									(27)	(97)
Ending Balance	1,422				1,449				1,422	1,449	$ 1,546
Ending Balance Individually Evaluated for Impairment	0				0				0	0
Ending Balance Collectively Evaluated for Impairment	1,422				1,449				1,422	1,449
Loans & Leases [Abstract]
Ending Balance	0				0				0	0
Ending Balance Individually Evaluated for Impairment	0				0				0	0
Ending Balance Collectively Evaluated for Impairment	0				0				0	0
Restructured Loans [Member]
Loans & Leases [Abstract]
Ending Balance Individually Evaluated for Impairment	$ 3,000				$ 3,300				$ 3,000	$ 3,300

Allowance for Credit Losses, Lo

Allowance for Credit Losses, Loan Portfolio Allocated by Management's Internal Credit Ratings (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	$ 2,215,295	$ 2,177,601
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	2,170,292	2,144,650
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	36,123	26,588
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	8,880	6,363
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	0	0
Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	0	0
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	684,961	668,046
Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	677,636	659,694
Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	6,843	6,817
Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	482	1,535
Agricultural Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	499,231	467,685
Agricultural Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	488,672	464,997
Agricultural Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	6,529	1,384
Agricultural Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	4,030	1,304
Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	100,206	176,462
Real Estate Construction [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	90,728	176,462
Real Estate Construction [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	9,478	0
Real Estate Construction [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	0	0
Residential 1st Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	260,751	242,247
Residential 1st Mortgages [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	259,795	241,816
Residential 1st Mortgages [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	41	47
Residential 1st Mortgages [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	915	384
Home Equity Lines and Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	34,525	31,625
Home Equity Lines and Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	34,476	31,558
Home Equity Lines and Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	0	0
Home Equity Lines and Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	49	67
Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	273,582	295,325
Agricultural [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	264,425	283,525
Agricultural [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	6,439	11,366
Agricultural [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	2,718	434
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	265,703	217,577
Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	260,565	208,172
Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	4,610	6,974
Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	528	2,431
Consumer & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	6,656	6,913
Consumer & Other [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	6,498	6,705
Consumer & Other [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	0	0
Consumer & Other [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	158	208
Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	89,680	71,721
Leases [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	87,497	71,721
Leases [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	2,183	0
Leases [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & leases	$ 0	$ 0

Allowance for Credit Losses, Ag

Allowance for Credit Losses, Aging Analysis of Loan Portfolio by the Time Past Due (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 Days and Still Accruing	$ 0	$ 0
Nonaccrual	0	3,074
Total Past Due	645	3,084
Current	2,214,650	2,174,517
Total Loans & Leases	2,215,295	2,177,601
Interest income forgone on nonaccrual loans	0	127	$ 109
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	645	10
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 Days and Still Accruing	0	0
Nonaccrual	0	0
Total Past Due	0	0
Current	684,961	668,046
Total Loans & Leases	684,961	668,046
Commercial Real Estate [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial Real Estate [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Agricultural Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 Days and Still Accruing	0	0
Nonaccrual	0	1,304
Total Past Due	0	1,304
Current	499,231	466,381
Total Loans & Leases	499,231	467,685
Agricultural Real Estate [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Agricultural Real Estate [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Real Estate Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 Days and Still Accruing	0	0
Nonaccrual	0	0
Total Past Due	0	0
Current	100,206	176,462
Total Loans & Leases	100,206	176,462
Real Estate Construction [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Real Estate Construction [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Residential 1st Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 Days and Still Accruing	0	0
Nonaccrual	0	95
Total Past Due	448	95
Current	260,303	242,152
Total Loans & Leases	260,751	242,247
Residential 1st Mortgages [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	448	0
Residential 1st Mortgages [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Home Equity Lines and Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 Days and Still Accruing	0	0
Nonaccrual	0	0
Total Past Due	10	0
Current	34,515	31,625
Total Loans & Leases	34,525	31,625
Home Equity Lines and Loans [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10	0
Home Equity Lines and Loans [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 Days and Still Accruing	0	0
Nonaccrual	0	243
Total Past Due	0	243
Current	273,582	295,082
Total Loans & Leases	273,582	295,325
Agricultural [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Agricultural [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 Days and Still Accruing	0	0
Nonaccrual	0	1,425
Total Past Due	180	1,425
Current	265,523	216,152
Total Loans & Leases	265,703	217,577
Commercial [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	180	0
Commercial [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Consumer & Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 Days and Still Accruing	0	0
Nonaccrual	0	7
Total Past Due	7	17
Current	6,649	6,896
Total Loans & Leases	6,656	6,913
Consumer & Other [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7	10
Consumer & Other [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 Days and Still Accruing	0	0
Nonaccrual	0	0
Total Past Due	0	0
Current	89,680	71,721
Total Loans & Leases	89,680	71,721
Leases [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Leases [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 0	$ 0

Allowance for Credit Losses, Im

Allowance for Credit Losses, Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
With no related allowance recorded [Abstract]
Recorded Investment	$ 1,015	$ 4,963
Unpaid Principal Balance	1,116	5,016
Average Recorded Investment	1,173	4,705
Interest Income Recognized	22	158
With an allowance recorded [Abstract]
Recorded Investment	5,303	2,592
Unpaid Principal Balance	5,364	2,844
Related Allowance	623	768
Average Recorded Investment	5,655	2,588
Interest Income Recognized	203	47
Total [Abstract]
Recorded Investment	6,318	7,555
Unpaid Principal Balance	6,480	7,860
Related Allowance	623	768
Average Recorded Investment	6,828	7,293
Interest Income Recognized	225	205
Commercial Real Estate [Member]
With no related allowance recorded [Abstract]
Recorded Investment	104	184
Unpaid Principal Balance	104	184
Average Recorded Investment	107	354
Interest Income Recognized	11	7
With an allowance recorded [Abstract]
Recorded Investment	2,973
Unpaid Principal Balance	2,961
Related Allowance	366
Average Recorded Investment	2,999
Interest Income Recognized	104
Total [Abstract]
Related Allowance	366
Agricultural Real Estate [Member]
With no related allowance recorded [Abstract]
Recorded Investment	0	1,305
Unpaid Principal Balance	0	1,305
Average Recorded Investment	488	569
Interest Income Recognized	0	3
Residential 1st Mortgages [Member]
With no related allowance recorded [Abstract]
Recorded Investment	911	451
Unpaid Principal Balance	1,012	504
Average Recorded Investment	532	404
Interest Income Recognized	11	10
With an allowance recorded [Abstract]
Recorded Investment	508	430
Unpaid Principal Balance	571	469
Related Allowance	25	21
Average Recorded Investment	469	336
Interest Income Recognized	16	13
Total [Abstract]
Related Allowance	25	21
Home Equity Lines and Loans [Member]
With no related allowance recorded [Abstract]
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Average Recorded Investment	16	181
Interest Income Recognized	0	0
With an allowance recorded [Abstract]
Recorded Investment	73	90
Unpaid Principal Balance	89	97
Related Allowance	4	5
Average Recorded Investment	74	123
Interest Income Recognized	3	4
Total [Abstract]
Related Allowance	4	5
Agricultural [Member]
With no related allowance recorded [Abstract]
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Average Recorded Investment	30	144
Interest Income Recognized	0	5
With an allowance recorded [Abstract]
Recorded Investment	0	625
Unpaid Principal Balance	0	625
Related Allowance	0	128
Average Recorded Investment	409	581
Interest Income Recognized	21	22
Total [Abstract]
Related Allowance	0	128
Commercial [Member]
With no related allowance recorded [Abstract]
Recorded Investment		3,023
Unpaid Principal Balance		3,023
Average Recorded Investment		3,053
Interest Income Recognized		133
With an allowance recorded [Abstract]
Recorded Investment	1,741	1,441
Unpaid Principal Balance	1,734	1,640
Related Allowance	220	608
Average Recorded Investment	1,693	1,536
Interest Income Recognized	59	8
Total [Abstract]
Related Allowance	220	608
Consumer & Other [Member]
With an allowance recorded [Abstract]
Recorded Investment	8	6
Unpaid Principal Balance	9	13
Related Allowance	8	6
Average Recorded Investment	11	12
Interest Income Recognized	0	0
Total [Abstract]
Related Allowance	$ 8	$ 6

Allowance for Credit Losses, 62

Allowance for Credit Losses, Loans by Class Modified as Troubled Debt Restructured Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)Loan	Dec. 31, 2016USD ($)Loan
Financing Receivable, Modifications [Line Items]
Specific reserves	$ 623	$ 736
Troubled debt restructured loans		5,900
Commitments to lend additional amounts to customers with outstanding loans that are classified as troubled debt restructurings	$ 0	$ 0
Loans by class modified as troubled debt restructured loans [Abstract]
Number of Loans | Loan	6	5
Pre-Modification Outstanding Recorded Investment	$ 852	$ 706
Post-Modification Recorded Outstanding Investment	808	679
Increase in allowance for loan losses due to TDR	0	0
TDR's charge-offs	$ 44	$ 27
Number of loans modified as troubled debt restructurings with subsequent payment defaults | Loan	0	0
Threshold period after which loan is considered to be in payment default	90 days
Stated Interest Rate Reduction [Member] | Minimum [Member]
Financing Receivable, Modifications [Line Items]
Period of modifications	3 years	5 years
Stated Interest Rate Reduction [Member] | Maximum [Member]
Financing Receivable, Modifications [Line Items]
Period of modifications	5 years	10 years
Extended Maturity [Member] | Minimum [Member]
Financing Receivable, Modifications [Line Items]
Period of modifications	3 years	5 years
Extended Maturity [Member] | Maximum [Member]
Financing Receivable, Modifications [Line Items]
Period of modifications	10 years	10 years
Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructured loans	$ 6,300	$ 4,500
Commercial Real Estate [Member]
Loans by class modified as troubled debt restructured loans [Abstract]
Number of Loans | Loan		1
Pre-Modification Outstanding Recorded Investment		$ 112
Post-Modification Recorded Outstanding Investment		$ 112
Residential 1st Mortgages [Member]
Loans by class modified as troubled debt restructured loans [Abstract]
Number of Loans | Loan	2	2
Pre-Modification Outstanding Recorded Investment	$ 673	$ 289
Post-Modification Recorded Outstanding Investment	$ 630	$ 281
Home Equity Lines and Loans [Member]
Loans by class modified as troubled debt restructured loans [Abstract]
Number of Loans | Loan	1	2
Pre-Modification Outstanding Recorded Investment	$ 32	$ 305
Post-Modification Recorded Outstanding Investment	$ 32	$ 286
Commercial [Member]
Loans by class modified as troubled debt restructured loans [Abstract]
Number of Loans | Loan	2
Pre-Modification Outstanding Recorded Investment	$ 138
Post-Modification Recorded Outstanding Investment	$ 138
Consumer & Other [Member]
Loans by class modified as troubled debt restructured loans [Abstract]
Number of Loans | Loan	1
Pre-Modification Outstanding Recorded Investment	$ 9
Post-Modification Recorded Outstanding Investment	$ 8

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]
Subtotal	$ 59,534	$ 59,638
Less: Accumulated Depreciation and Amortization	30,855	30,409
Total	28,679	29,229
Depreciation and amortization	2,186	1,896	$ 1,685
Total rental expense	688	644	604
Rental income	169	102	$ 94
Land and Buildings [Member]
Property, Plant and Equipment [Line Items]
Subtotal	36,018	37,003
Furniture, Fixtures, and Equipment [Member]
Property, Plant and Equipment [Line Items]
Subtotal	20,399	20,196
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Subtotal	$ 3,117	$ 2,439

Other Real Estate (Details)

Other Real Estate (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Real Estate [Abstract]
Other real estate, net	$ 837	$ 3,700

Time Deposits (Details)

Time Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Time Deposits $250,000 or more [Abstract]
Balance	$ 212,574	$ 289,955
Maturities of Time Deposits [Abstract]
2,018	426,874
2,019	30,219
2,020	10,317
2,021	3,100
2,022	4,887
Total	$ 475,397	$ 570,293

Income Taxes, Current and Defer

Income Taxes, Current and Deferred Income Tax Expense (Benefit) (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
Current [Abstract]
Federal									$ 9,460	$ 13,101	$ 11,979
State									4,046	4,832	4,446
Total Current									13,506	17,933	16,425
Deferred [Abstract]
Federal									11,154	(1,607)	383
State									1,451	(229)	116
Total Deferred									12,605	(1,836)	499
Total Provision for Taxes	$ 11,974	$ 5,000	$ 4,708	$ 4,429	$ 3,389	$ 4,503	$ 4,169	$ 4,036	$ 26,111	$ 16,097	$ 16,924

Income Taxes, Effective Income

Income Taxes, Effective Income Tax Rate Reconciliation (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
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Tax Provision at Federal Statutory Rate									$ 19,068	$ 16,037	$ 15,510
Interest on Obligations of States and Political Subdivisions exempt from Federal Taxation									(617)	(675)	(711)
State and Local Income Taxes, Net of Federal Income Tax Benefit									3,573	2,992	2,966
Bank Owned Life Insurance									(696)	(731)	(712)
Low-Income Housing Tax Credit									(1,546)	(1,201)	(291)
Bargain Purchase Gain									0	(641)	0
Deferred Tax Asset Remeasurement									6,256	0	0
Other, Net									73	316	162
Total Provision for Taxes	$ 11,974	$ 5,000	$ 4,708	$ 4,429	$ 3,389	$ 4,503	$ 4,169	$ 4,036	$ 26,111	$ 16,097	$ 16,924
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Tax Provision at Federal Statutory Rate									35.00%	35.00%	35.00%
Interest on Obligations of States and Political Subdivisions exempt from Federal Taxation									(1.10%)	(1.50%)	(1.60%)
State and Local Income Taxes, Net of Federal Income Tax Benefit									6.50%	6.50%	6.70%
Bank Owned Life Insurance									(1.30%)	(1.60%)	(1.60%)
Low-Income Housing Tax Credit									(2.80%)	(2.60%)	(0.70%)
Bargain Purchase Gain									(0.00%)	(1.40%)	(0.00%)
Deferred Tax Asset Remeasurement									11.50%	0.00%	0.00%
Other, Net									0.10%	0.70%	0.40%
Total Provision for Taxes									47.90%	35.10%	38.20%

Income Taxes, Components of Net

Income Taxes, Components of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred Tax Assets [Abstract]
Allowance for Credit Losses		$ 14,962	$ 20,260
Accrued Liabilities		7,421	9,807
Deferred Compensation		8,996	14,166
State Franchise Tax		850	1,680
Acquired Net Operating Loss		756	1,135
Fair Value Adjustment on Loans Acquired		242	429
Fair Value Adjustment on ORE Acquired		108	299
Unrealized Loss on Securities Available-for-Sale		373	58
Low-Income Housing Investment		470	366
Other		17	233
Total Deferred Tax Assets		34,195	48,433
Deferred Tax Liabilities [Abstract]
Premises and Equipment		(1,361)	(1,707)
Securities Accretion		(164)	(341)
Leasing Activities		(12,389)	(14,868)
Core Deposit Intangible Asset		(247)	(398)
Prepaid		(964)	(314)
Other		(944)	(494)
Total Deferred Tax Liabilities		(16,069)	(18,122)
Net Deferred Tax Assets		$ 18,126	$ 30,311
Income Tax Disclosure [Line Items]
Tax Provision at Federal Statutory Rate		35.00%	35.00%	35.00%
Plan [Member]
Income Tax Disclosure [Line Items]
Tax Provision at Federal Statutory Rate	21.00%

Short Term Borrowings (Details)

Short Term Borrowings (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Short Term Borrowings [Abstract]
Unused lines of credit	$ 1,000	$ 962.8
Advances from FHLB	0	0
Federal Funds purchased or advances from FRB	$ 0	$ 0

Securities Sold Under Agreeme70

Securities Sold Under Agreement to Repurchase (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Securities Sold Under Agreement to Repurchase [Abstract]
Securities sold under agreements to repurchase	$ 0	$ 0

Federal Home Loan Bank Advanc71

Federal Home Loan Bank Advances (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Federal Home Loan Bank Advances [Abstract]
Federal Home Loan Bank Advances, long term	$ 0	$ 0
Federal Home Loan Bank Advances, short term	0	$ 0
Collateral on borrowing lines	618.4
Borrowing capacity	$ 521.2

Long-term Subordinated Debent72

Long-term Subordinated Debentures (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)$ / shares
Debt Instrument [Line Items]
Guaranteed preferred beneficial interests	$ 10
Liquidation value (per capital security) | $ / shares	$ 1,000
Trust Preferred Securities redemption date	Dec. 17, 2033
Junior Subordinated Debentures [Member]
Debt Instrument [Line Items]
Junior subordinated debentures	$ 10.3
Junior Subordinated Debentures [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Term of variable rate	3 months
Basis spread on variable rate	2.85%

Shareholders' Equity, Stock Rep

Shareholders' Equity, Stock Repurchase Program, Dividends and Issuance of Common Stock (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Equity, Class of Treasury Stock [Line Items]
Approved funds available for common stock repurchase program	$ 20
Stock repurchase program, period in force	3 years
Number of shares of stock repurchased (in shares)	0	0
Retained net profit period	2 years
Issuance of common stock (in shares)	4,975	16,542
Issuance of common stock for contribution to non-qualified defined contribution retirement plans (in shares)	4,975	4,610
Minimum [Member]
Equity, Class of Treasury Stock [Line Items]
Per share price of shares issued (in dollars per share)	$ 590	$ 525
Maximum [Member]
Equity, Class of Treasury Stock [Line Items]
Per share price of shares issued (in dollars per share)	$ 595	$ 580
Delta National Bancorp [Member]
Equity, Class of Treasury Stock [Line Items]
Issuance of common stock in acquisition (in shares)		11,932

Shareholders' Equity, Complianc

Shareholders' Equity, Compliance with Regulatory Capital Requirements (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Total Capital to Risk Weighted Assets [Abstract]
Actual Amount	$ 342,210	$ 319,983
Current Regulatory Capital Requirement, Amount	$ 209,532	$ 199,981
Total Capital to Risk Weighted Assets, Ratio [Abstract]
Actual Ratio	13.07%	12.80%
Current Regulatory Capital Requirement, Ratio	8.00%	8.00%
Total Common Equity Tier 1 Capital [Abstract]
Actual Amount	$ 299,401	$ 278,981
Current Regulatory Capital Requirement, Amount	$ 117,862	$ 112,489
Total Common Equity Tier 1 Capital, Ratio [Abstract]
Actual Ratio	11.43%	11.16%
Current Regulatory Capital Requirement, Ratio	4.50%	4.50%
Tier 1 Capital to Risk Weighted Assets [Abstract]
Actual Amount	$ 309,250	$ 288,527
Current Regulatory Capital Requirement, Amount	$ 157,150	$ 149,986
Tier 1 Capital to Risk Weighted Assets, Ratio [Abstract]
Actual Ratio	11.81%	11.54%
Current Regulatory Capital Requirement Ratio	6.00%	6.00%
Tier 1 Capital to Average Assets [Abstract]
Actual Amount	$ 309,250	$ 288,527
Current Regulatory Capital Requirement, Amount	$ 123,790	$ 114,568
Tier 1 Capital to Average Assets, Ratio [Abstract]
Actual Ratio	9.99%	10.07%
Current Regulatory Capital Requirement, Ratio	4.00%	4.00%
Bank [Member]
Total Capital to Risk Weighted Assets [Abstract]
Actual Amount	$ 330,041	$ 319,776
Current Regulatory Capital Requirement, Amount	208,552	199,958
Well Capitalized Under Prompt Corrective Action, Amount	$ 260,691	$ 249,947
Total Capital to Risk Weighted Assets, Ratio [Abstract]
Actual Ratio	12.66%	12.79%
Current Regulatory Capital Requirement, Ratio	8.00%	8.00%
Well Capitalized Under Prompt Corrective Action, Ratio	10.00%	10.00%
Total Common Equity Tier 1 Capital [Abstract]
Actual Amount	$ 297,232	$ 288,324
Current Regulatory Capital Requirement, Amount	117,311	112,476
Well Capitalized Under Prompt Corrective Action, Amount	$ 169,449	$ 162,466
Total Common Equity Tier 1 Capital, Ratio [Abstract]
Actual Ratio	11.40%	11.54%
Current Regulatory Capital Requirement, Ratio	4.50%	4.50%
Well Capitalized Under Prompt Corrective Action, Ratio	6.50%	6.50%
Tier 1 Capital to Risk Weighted Assets [Abstract]
Actual Amount	$ 297,232	$ 288,323
Current Regulatory Capital Requirement, Amount	156,414	149,968
Well Capitalized Under Prompt Corrective Action, Amount	$ 208,552	$ 199,958
Tier 1 Capital to Risk Weighted Assets, Ratio [Abstract]
Actual Ratio	11.40%	11.54%
Current Regulatory Capital Requirement Ratio	6.00%	6.00%
Well Capitalized Under Prompt Corrective Action, Ratio	8.00%	8.00%
Tier 1 Capital to Average Assets [Abstract]
Actual Amount	$ 297,232	$ 288,324
Current Regulatory Capital Requirement, Amount	123,178	114,409
Well Capitalized Under Prompt Corrective Action, Amount	$ 153,972	$ 143,011
Tier 1 Capital to Average Assets, Ratio [Abstract]
Actual Ratio	9.65%	10.08%
Current Regulatory Capital Requirement, Ratio	4.00%	4.00%
Well Capitalized Under Prompt Corrective Action, Ratio	5.00%	5.00%

Dividends and Basic Earnings 75

Dividends and Basic Earnings Per Common 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
Dividends and Basic Earnings Per Common Share [Abstract]
Cash dividends									$ 10,982	$ 10,478	$ 10,157
Cash dividends paid per share of common stock (in dollars per share)									$ 13.55	$ 13.10	$ 12.90
Percentage increase in cash dividend per share									3.40%
Earnings per share for the period [Abstract]
Net Income	$ 3,781	$ 8,581	$ 8,187	$ 7,821	$ 7,681	$ 7,538	$ 7,332	$ 7,172	$ 28,370	$ 29,723	$ 27,392
Weighted Average Number of Common Shares Outstanding (in shares)									809,834	793,970	786,582
Basic Earnings Per Common Share (in dollars per share)	$ 4.64	$ 10.59	$ 10.12	$ 9.68	$ 9.62	$ 9.51	$ 9.25	$ 9.06	$ 35.03	$ 37.44	$ 34.82

Employee Benefit Plans (Details

Employee Benefit Plans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)Contribution	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Tax-exempt interest earned on the life insurance policies	$ 1,822	$ 1,864	$ 1,908
Executive Officers [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Employer contribution	4,300	3,800	3,500
Total accrued liability	43,300	37,400
Tax-exempt interest earned on the life insurance policies	1,800	1,900	1,900
Cash surrender value of life insurance policies	59,600	57,800
Senior Level Employees [Member] | Senior Management Retention Plan [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Employer contribution	765	627	530
Total accrued liability	$ 4,400	3,400
Profit Sharing Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan, Type [Extensible List]	us-gaap:PensionPlansDefinedBenefitMember
Minimum requisite service period	1 year
Number of annual employer contribution | Contribution	2
Employer discretionary contribution amount	$ 1,000	975	925
Employer mandatory contributions amount	$ 1,200	$ 1,200	$ 1,100
Annual vesting percentage, first year	0.00%
Annual vesting percentage, full year thereafter	25.00%
Benefit vesting period	5 years

Fair Value Measurements, Assets

Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of selling costs		10.00%
Consumer mortgage loans in the process of foreclosure value		$ 0
Investment Securities Available-for-Sale		481,596	$ 448,263
Gains (losses) for assets categorized as Level 3 assets		0
Transfer into Level 3		0
Transfer out of Level 3		0
Government Agency & Government-Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		3,128	3,241
US Treasury Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		144,164	134,428
US Govt SBA [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		29,380	36,314
Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale	[1]	301,914	273,270
Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		3,010	1,010
Significant Unobservable Inputs (Level 3) [Member] | SBA Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		2,500
Amount of increase in investment		2,000
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		481,596	448,263
Recurring [Member] | Government Agency & Government-Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		3,128	3,241
Recurring [Member] | US Treasury Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		144,164	134,428
Recurring [Member] | US Govt SBA [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		29,380	36,314
Recurring [Member] | Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		301,914	273,270
Recurring [Member] | Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		3,010	1,010
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		144,364	134,628
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Government Agency & Government-Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		0	0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | US Treasury Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		144,164	134,428
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | US Govt SBA [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		0	0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		0	0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		200	200
Recurring [Member] | Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		334,732	313,135
Recurring [Member] | Other Observable Inputs (Level 2) [Member] | Government Agency & Government-Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		3,128	3,241
Recurring [Member] | Other Observable Inputs (Level 2) [Member] | US Treasury Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		0	0
Recurring [Member] | Other Observable Inputs (Level 2) [Member] | US Govt SBA [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		29,380	36,314
Recurring [Member] | Other Observable Inputs (Level 2) [Member] | Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		301,914	273,270
Recurring [Member] | Other Observable Inputs (Level 2) [Member] | Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		310	310
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		2,500	500
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Government Agency & Government-Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		0	0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | US Treasury Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		0	0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | US Govt SBA [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		0	0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		0	0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Securities Available-for-Sale		$ 2,500	$ 500
[1]	All Mortgage Backed Securities were issued by an agency or government sponsored entity of the U.S. government.

Fair Value Measurements, Asse78

Fair Value Measurements, Assets or Liabilities Measured at Fair Value on a Non-recurring Basis (Details) - Nonrecurring [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	$ 5,181	$ 1,893
Other Real Estate	873	3,745
Total Assets Measured at Fair Value On a Non-Recurring Basis	6,054	5,638
Commercial Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	2,595
Residential 1st Mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	997	480
Home Equity Lines and Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	75	83
Other Real Estate		785
Agricultural [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans		497
Commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	1,514	833
Real Estate Construction [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Real Estate	873	2,960
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	0	0
Other Real Estate	0	0
Total Assets Measured at Fair Value On a Non-Recurring Basis	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Commercial Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Residential 1st Mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Home Equity Lines and Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	0	0
Other Real Estate		0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Agricultural [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans		0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Real Estate Construction [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Real Estate	0	0
Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	0	0
Other Real Estate	0	0
Total Assets Measured at Fair Value On a Non-Recurring Basis	0	0
Other Observable Inputs (Level 2) [Member] | Commercial Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	0
Other Observable Inputs (Level 2) [Member] | Residential 1st Mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	0	0
Other Observable Inputs (Level 2) [Member] | Home Equity Lines and Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	0	0
Other Real Estate		0
Other Observable Inputs (Level 2) [Member] | Agricultural [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans		0
Other Observable Inputs (Level 2) [Member] | Commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	0	0
Other Observable Inputs (Level 2) [Member] | Real Estate Construction [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Real Estate	0	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	5,181	1,893
Other Real Estate	873	3,745
Total Assets Measured at Fair Value On a Non-Recurring Basis	6,054	5,638
Significant Unobservable Inputs (Level 3) [Member] | Commercial Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	2,595
Significant Unobservable Inputs (Level 3) [Member] | Residential 1st Mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	997	480
Significant Unobservable Inputs (Level 3) [Member] | Home Equity Lines and Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	75	83
Other Real Estate		785
Significant Unobservable Inputs (Level 3) [Member] | Agricultural [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans		497
Significant Unobservable Inputs (Level 3) [Member] | Commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	1,514	833
Significant Unobservable Inputs (Level 3) [Member] | Real Estate Construction [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Real Estate	$ 873	$ 2,960

Fair Value Measurements, Quanti

Fair Value Measurements, Quantitative Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Impaired Loans [Member] | Commercial Real Estate [Member] | Income Approach [Member]
Quantitative Information [Abstract]
Impaired Loans	$ 2,595
Unobservable inputs	Capitalization Rate
Impaired Loans [Member] | Commercial Real Estate [Member] | Income Approach [Member] | Minimum [Member]
Quantitative Information [Abstract]
Capitalization rate	3.25%
Impaired Loans [Member] | Commercial Real Estate [Member] | Income Approach [Member] | Maximum [Member]
Quantitative Information [Abstract]
Capitalization rate	3.25%
Impaired Loans [Member] | Commercial Real Estate [Member] | Income Approach [Member] | Weighted Average [Member]
Quantitative Information [Abstract]
Capitalization rate	3.25%
Impaired Loans [Member] | Residential 1st Mortgages [Member] | Sales Comparison Approach [Member]
Quantitative Information [Abstract]
Impaired Loans	$ 997
Unobservable inputs	Adjustment for Difference Between Comparable Sales
Impaired Loans [Member] | Residential 1st Mortgages [Member] | Sales Comparison Approach [Member] | Minimum [Member]
Quantitative Information [Abstract]
Adjustment for difference between comparable sales	1.00%
Impaired Loans [Member] | Residential 1st Mortgages [Member] | Sales Comparison Approach [Member] | Maximum [Member]
Quantitative Information [Abstract]
Adjustment for difference between comparable sales	4.00%
Impaired Loans [Member] | Residential 1st Mortgages [Member] | Sales Comparison Approach [Member] | Weighted Average [Member]
Quantitative Information [Abstract]
Adjustment for difference between comparable sales	2.00%
Impaired Loans [Member] | Home Equity Lines and Loans [Member] | Sales Comparison Approach [Member]
Quantitative Information [Abstract]
Impaired Loans	$ 75
Unobservable inputs	Adjustment for Difference Between Comparable Sales
Impaired Loans [Member] | Home Equity Lines and Loans [Member] | Sales Comparison Approach [Member] | Minimum [Member]
Quantitative Information [Abstract]
Adjustment for difference between comparable sales	1.00%
Impaired Loans [Member] | Home Equity Lines and Loans [Member] | Sales Comparison Approach [Member] | Maximum [Member]
Quantitative Information [Abstract]
Adjustment for difference between comparable sales	2.00%
Impaired Loans [Member] | Home Equity Lines and Loans [Member] | Sales Comparison Approach [Member] | Weighted Average [Member]
Quantitative Information [Abstract]
Adjustment for difference between comparable sales	2.00%
Impaired Loans [Member] | Commercial [Member] | Income Approach [Member]
Quantitative Information [Abstract]
Impaired Loans	$ 1,514
Unobservable inputs	Capitalization Rate
Impaired Loans [Member] | Commercial [Member] | Income Approach [Member] | Minimum [Member]
Quantitative Information [Abstract]
Capitalization rate	2.95%
Impaired Loans [Member] | Commercial [Member] | Income Approach [Member] | Maximum [Member]
Quantitative Information [Abstract]
Capitalization rate	8.70%
Impaired Loans [Member] | Commercial [Member] | Income Approach [Member] | Weighted Average [Member]
Quantitative Information [Abstract]
Capitalization rate	3.40%
Other Real Estate [Member] | Real Estate Construction [Member] | Sales Comparison Approach [Member]
Quantitative Information [Abstract]
Other Real Estate	$ 873
Unobservable inputs	Adjustment for Difference Between Comparable Sales
Other Real Estate [Member] | Real Estate Construction [Member] | Sales Comparison Approach [Member] | Minimum [Member]
Quantitative Information [Abstract]
Adjustment for difference between comparable sales	10.00%
Other Real Estate [Member] | Real Estate Construction [Member] | Sales Comparison Approach [Member] | Maximum [Member]
Quantitative Information [Abstract]
Adjustment for difference between comparable sales	10.00%
Other Real Estate [Member] | Real Estate Construction [Member] | Sales Comparison Approach [Member] | Weighted Average [Member]
Quantitative Information [Abstract]
Adjustment for difference between comparable sales	10.00%

Fair Value of Financial Instr80

Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets [Abstract]
Investment Securities Available-for-Sale	$ 481,596	$ 448,263
Investment Securities Held-to-Maturity	55,236	58,408
Carrying Amount [Member]
Assets [Abstract]
Cash and Cash Equivalents	187,149	98,960
Investment Securities Available-for-Sale	481,596	448,263
Investment Securities Held-to-Maturity	54,460	58,109
FHLB Stock	10,342	8,872
Loans & Leases, Net of Deferred Fees & Allowance	2,164,953	2,129,682
Accrued Interest Receivable	10,999	10,047
Liabilities [Abstract]
Deposits	2,723,228	2,581,711
Subordinated Debentures	10,310	10,310
Accrued Interest Payable	1,137	852
Estimated Fair Value [Member]
Assets [Abstract]
Cash and Cash Equivalents	187,149	98,960
Investment Securities Available-for-Sale	481,596	448,263
Investment Securities Held-to-Maturity	55,236	58,408
Loans & Leases, Net of Deferred Fees & Allowance	2,137,987	2,107,060
Accrued Interest Receivable	10,999	10,047
Liabilities [Abstract]
Deposits	2,720,502	2,580,601
Subordinated Debentures	7,428	6,578
Accrued Interest Payable	1,137	852
Estimated Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets [Abstract]
Cash and Cash Equivalents	187,149	98,960
Investment Securities Available-for-Sale	29,580	134,628
Investment Securities Held-to-Maturity	0	0
Loans & Leases, Net of Deferred Fees & Allowance	0	0
Accrued Interest Receivable	0	0
Liabilities [Abstract]
Deposits	2,247,831	2,011,418
Subordinated Debentures	0	0
Accrued Interest Payable	0	0
Estimated Fair Value [Member] | Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
Cash and Cash Equivalents	0	0
Investment Securities Available-for-Sale	449,516	313,135
Investment Securities Held-to-Maturity	38,492	40,415
Loans & Leases, Net of Deferred Fees & Allowance	0	0
Accrued Interest Receivable	10,999	10,047
Liabilities [Abstract]
Deposits	472,671	569,183
Subordinated Debentures	7,428	6,578
Accrued Interest Payable	1,137	852
Estimated Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets [Abstract]
Cash and Cash Equivalents	0	0
Investment Securities Available-for-Sale	2,500	500
Investment Securities Held-to-Maturity	16,744	17,993
Loans & Leases, Net of Deferred Fees & Allowance	2,137,987	2,107,060
Accrued Interest Receivable	0	0
Liabilities [Abstract]
Deposits	0	0
Subordinated Debentures	0	0
Accrued Interest Payable	$ 0	$ 0

Commitments and Contingencies81

Commitments and Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Minimum future rental commitments under noncancellable operating leases [Abstract]
2,018	$ 670
2,019	634
2,020	644
2,021	462
2,022	146
Due remaining term of the lease	139
Commitments to Extend Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet risks, amount, liability	735,678	$ 609,653
Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet risks, amount, liability	$ 20,061	20,444
Letters of Credit [Member] | Minimum [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off balance sheet risks maturity period	1 month
Letters of Credit [Member] | Maximum [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off balance sheet risks maturity period	60 months
Performance Guarantees under Interest Rate Swap Contracts Entered into between our Borrowing Customers and Third Parties [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet risks, amount, liability	$ 759	$ 1,835

Parent Company Financial Info82

Parent Company Financial Information, Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Balance Sheets [Abstract]
Investment Securities	$ 536,056	$ 506,372
Total Assets	3,075,452	2,922,121
Subordinated Debentures	10,310	10,310
Liabilities	2,775,792	2,642,140
Shareholders' Equity	299,660	279,981	$ 251,835	$ 233,178
Total Liabilities and Shareholders' Equity	3,075,452	2,922,121
Parent Company [Member]
Condensed Balance Sheets [Abstract]
Cash	332	228	$ 308	$ 363
Investment in Farmers & Merchants Bank of Central California	297,643	289,778
Investment Securities	409	409
Other Assets	12,006	184
Total Assets	310,390	290,599
Subordinated Debentures	10,310	10,310
Liabilities	420	308
Shareholders' Equity	299,660	279,981
Total Liabilities and Shareholders' Equity	$ 310,390	$ 290,599

Parent Company Financial Info83

Parent Company Financial Information, Condensed Statements of Income (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
Condensed Statements of Income [Abstract]
Interest Income	$ 28,076	$ 27,850	$ 26,531	$ 25,866	$ 24,449	$ 24,152	$ 23,363	$ 23,106	$ 108,323	$ 95,070	$ 86,750
Tax Benefit	(11,974)	(5,000)	(4,708)	(4,429)	(3,389)	(4,503)	(4,169)	(4,036)	(26,111)	(16,097)	(16,924)
Net Income	$ 3,781	$ 8,581	$ 8,187	$ 7,821	$ 7,681	$ 7,538	$ 7,332	$ 7,172	28,370	29,723	27,392
Parent Company [Member]
Condensed Statements of Income [Abstract]
Equity in Undistributed Earnings in Farmers & Merchants Bank of Central California									5,575	17,043	17,352
Dividends from Subsidiary									23,575	14,275	10,875
Interest Income									13	11	10
Other Expenses, Net									(1,552)	(2,485)	(1,451)
Tax Benefit									759	879	606
Net Income									$ 28,370	$ 29,723	$ 27,392

Parent Company Financial Info84

Parent Company Financial Information, Condensed Statements of Cash Flows (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
Cash Flows from Operating Activities [Abstract]
Net Income	$ 3,781	$ 8,581	$ 8,187	$ 7,821	$ 7,681	$ 7,538	$ 7,332	$ 7,172	$ 28,370	$ 29,723	$ 27,392
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities [Abstract]
Net Cash Provided by Operating Activities									39,944	34,812	37,327
Investing Activities [Abstract]
Net Cash Used in Investing Activities									(82,190)	(185,444)	(258,308)
Financing Activities [Abstract]
Cash Dividends									(10,982)	(10,478)	(10,157)
Net Cash Provided by (Used in) Financing Activities									130,535	190,046	203,302
Increase (Decrease) in Cash and Cash Equivalents									88,289	39,414	(17,679)
Parent Company [Member]
Cash Flows from Operating Activities [Abstract]
Net Income									28,370	29,723	27,392
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities [Abstract]
Equity in Undistributed Net Earnings from Subsidiary									(5,575)	(17,043)	(17,352)
Net (Increase) Decrease in Other Assets									(11,822)	(124)	(79)
Net Increase (Decrease) in Liabilities									112	49	141
Net Cash Provided by Operating Activities									11,085	12,605	10,102
Investing Activities [Abstract]
Securities Sold or Matured									1	0	0
Payments for Business Acquisition									0	(2,207)	0
Payments for Investments in Subsidiaries									(2,953)	(2,586)	(3,360)
Net Cash Used in Investing Activities									(2,952)	(4,793)	(3,360)
Financing Activities [Abstract]
Issuance of Common Stock									2,953	2,586	3,360
Cash Dividends									(10,982)	(10,478)	(10,157)
Net Cash Provided by (Used in) Financing Activities									(8,029)	(7,892)	(6,797)
Increase (Decrease) in Cash and Cash Equivalents									104	(80)	(55)
Cash and Cash Equivalents at Beginning of Year				$ 228				$ 308	228	308	363
Cash and Cash Equivalents at End of Year	$ 332				$ 228				$ 332	$ 228	$ 308

Quarterly Unaudited Financial85

Quarterly Unaudited Financial Data (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 Unaudited Financial Data [Abstract]
Total Interest Income	$ 29,692	$ 29,609	$ 28,069	$ 27,242	$ 25,664	$ 25,262	$ 24,314	$ 24,026	$ 114,612	$ 99,266	$ 90,075
Total Interest Expense	1,616	1,759	1,538	1,376	1,215	1,110	951	920	6,289	4,196	3,325
Net Interest Income	28,076	27,850	26,531	25,866	24,449	24,152	23,363	23,106	108,323	95,070	86,750
Provision for Credit Losses	0	1,600	650	600	3,485	250	0	2,600	2,850	6,335	750
Net Interest Income After Provision for Credit Losses	28,076	26,250	25,881	25,266	20,964	23,902	23,363	20,506	105,473	88,735	86,000
Total Non-Interest Income	4,179	3,638	3,539	5,406	5,108	4,553	2,875	2,721	16,762	15,257	14,575
Total Non-Interest Expense	16,500	16,307	16,525	18,422	15,002	16,414	14,737	12,019	67,754	58,172	56,259
Income Before Income Taxes	15,755	13,581	12,895	12,250	11,070	12,041	11,501	11,208	54,481	45,820	44,316
Provision for Income Taxes	11,974	5,000	4,708	4,429	3,389	4,503	4,169	4,036	26,111	16,097	16,924
Net Income	$ 3,781	$ 8,581	$ 8,187	$ 7,821	$ 7,681	$ 7,538	$ 7,332	$ 7,172	$ 28,370	$ 29,723	$ 27,392
Basic Earnings Per Common Share (in dollars per share)	$ 4.64	$ 10.59	$ 10.12	$ 9.68	$ 9.62	$ 9.51	$ 9.25	$ 9.06	$ 35.03	$ 37.44	$ 34.82

Subsequent Events (Details)

Subsequent Events (Details) - Bank of Rio Vista [Member] - Subsequent Event [Member]	Feb. 27, 2018USD ($)shares
Subsequent Event [Line Items]
Number of additional shares acquired (in shares)	8
Value of additional shares acquired | $	$ 95,200
Total ownership of shares (in shares)	1,586
Percentage of ownership of common shares outstanding	39.65%