Arrow Financial (AROW) 10-Q 8 Nov 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information Document - shares	9 Months Ended
	Sep. 30, 2018	Oct. 31, 2018
Entity Information [Line Items]
Entity Registrant Name	Arrow Financial Corporation
Entity Central Index Key	717,538
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		14,452,521
Entity Current Reporting Status	Yes

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
ASSETS
Cash and Due From Banks	$ 57,385	$ 42,562	$ 55,683
Interest-Bearing Deposits at Banks	34,910	30,276	24,983
Investment Securities:
Available-for-Sale	340,411	300,200	315,459
Held-to-Maturity (Approximate Fair Value of $282,719 at September 30, 2018; $335,901 at December 31, 2017; and $343,899 at September 30, 2017)	289,952	335,907	341,526
Equity Securities	1,916	0	0
Other Investments	10,866	9,949	6,704
Loans	2,126,100	1,950,770	1,908,799
Allowance for Loan Losses	(20,003)	(18,586)	(17,695)
Net Loans	2,106,097	1,932,184	1,891,104
Premises and Equipment, Net	28,601	27,619	26,432
Goodwill	21,873	21,873	21,873
Other Intangible Assets, Net	1,954	2,289	2,395
Other Assets	59,255	57,606	58,303
Total Assets	2,953,220	2,760,465	2,744,462
LIABILITIES
Noninterest-Bearing Deposits	490,469	441,945	448,515
Interest-Bearing Checking Accounts	899,547	907,315	967,250
Savings Deposits	758,727	694,573	696,805
Time Deposits over $250,000	76,226	38,147	28,464
Other Time Deposits	182,886	163,136	166,082
Total Deposits	2,407,855	2,245,116	2,307,116
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase		64,966	61,419
Federal Home Loan Bank Overnight Advances		105,000	33,000
Federal Home Loan Bank Term Advances		55,000	55,000
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts		20,000	20,000
Other Liabilities	22,052	20,780	23,279
Total Liabilities	2,688,410	2,510,862	2,499,814
STOCKHOLDERS’ EQUITY
Preferred Stock, $5 Par Value; 1,000,000 Shares Authorized	0	0	0
Common Stock, $1 Par Value; 20,000,000 Shares Authorized (19,035,565 Shares Issued at September 30, 2018; 18,481,301 at December 31, 2017 and 18,481,301 at September 30, 2017)	19,035	18,481	18,481
Additional Paid-in Capital	313,763	290,219	289,294
Retained Earnings	24,258	28,818	22,581
Unallocated ESOP Shares (9,932 Shares at September 30, 2018; 9,643 Shares at December 31, 2017 and 20,050 Shares at September 30, 2017)	(200)	(200)	(400)
Accumulated Other Comprehensive Loss	(12,621)	(8,514)	(6,135)
Treasury Stock, at Cost (4,584,147 Shares at September 30, 2018; 4,541,524 Shares at December 31, 2017 and 4,570,291 Shares at September 30, 2017)	(79,425)	(79,201)	(79,173)
Total Stockholders’ Equity	264,810	249,603	244,648
Total Liabilities and Stockholders’ Equity	$ 2,953,220	$ 2,760,465	$ 2,744,462

Consolidated Balance Sheet (Par

Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Statement of Financial Position [Abstract]
Held-to-Maturity Securities, at Fair Value	$ 282,719	$ 335,901	$ 343,899
Preferred Stock, par value, in dollars per share	$ 5	$ 5	$ 5
Preferred Stock, shares authorized	1,000,000	1,000,000	1,000,000
Common Stock, par value, in dollars per share	$ 1	$ 1	$ 1
Common Stock, shares authorized	20,000,000	20,000,000	20,000,000
Common Stock, shares issued	19,035,565	18,481,301	18,481,301
Unallocated ESOP Shares, in shares	9,932	9,643	20,050
Treasury Stock, in shares	4,584,147	4,541,524	4,570,291

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		3 Months Ended				9 Months Ended
		Sep. 30, 2018		Sep. 30, 2017		Sep. 30, 2018		Sep. 30, 2017
INTEREST AND DIVIDEND INCOME
Interest and Fees on Loans		$ 20,839		$ 17,996		$ 59,606		$ 51,693
Interest on Deposits at Banks		182		104		474		242
Interest and Dividends on Investment Securities:
Fully Taxable		2,187		1,924		6,128		5,927
Exempt from Federal Taxes		1,287		1,575		4,295		4,660
Total Interest and Dividend Income		24,495		21,599		70,503		62,522
INTEREST EXPENSE
Interest-Bearing Checking Accounts		390		376		1,165		1,088
Savings Deposits		901		356		2,134		963
Time Deposits over $250,000		301		66		833		187
Other Time Deposits		370		241		911		702
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase		15		13		47		29
Federal Home Loan Bank Advances		1,270		700		2,340		1,651
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts		251		197		712		564
Total Interest Expense		3,498		1,949		8,142		5,184
NET INTEREST INCOME		20,997		19,650		62,361		57,338
Provision for Loan Losses		586		800		1,961		1,580
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES		20,411		18,850		60,400		55,758
NONINTEREST INCOME
Insurance Commissions		2,024		2,113		6,119		6,426
Net Gain on Securities		114		10		355		10
Net Gain on Sales of Loans		54		182		115		431
Other Operating Income		291		267		900		867
Total Noninterest Income		7,350		7,141		22,150		20,893
NONINTEREST EXPENSE
Salaries and Employee Benefits		9,771		9,382		28,952		27,740
Occupancy Expenses, Net		2,262		2,371		7,223		7,410
FDIC Assessments		218		225		658		679
Other Operating Expense		3,775		3,570		11,341		10,832
Total Noninterest Expense		16,026		15,548		48,174		46,661
INCOME BEFORE PROVISION FOR INCOME TAXES		11,735		10,443		34,376		29,990
Provision for Income Taxes		2,475		3,027		6,855		8,735
NET INCOME		$ 9,260		$ 7,416		$ 27,521		$ 21,255
Average Shares Outstanding:
Basic, in shares		14,431	[1]	14,305	[2]	14,393	[1]	14,306	[2]
Diluted, in shares	[2]	14,520		14,385		14,479		14,401
Per Common Share:
Basic Earnings, in dollars per share		$ 0.64	[1]	$ 0.52	[1]	$ 1.91	[1]	$ 1.49	[2]
Diluted Earnings, in dollars per share		$ 0.64	[1]	$ 0.52	[1]	$ 1.90	[1]	$ 1.48	[2]
Fiduciary and Trust
NONINTEREST INCOME
Revenue from Contract with Customer		$ 2,262		$ 2,116		$ 7,106		$ 6,284
Deposit Account
NONINTEREST INCOME
Revenue from Contract with Customer		$ 2,605		$ 2,453		$ 7,555		$ 6,875
[1]	Cash dividends paid per share have been adjusted for the September 27, 2018 3% stock dividend.
[2]	Share and Per Share Amounts have been restated for the September 27, 2018 3% stock dividend.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net Income	$ 9,260	$ 7,416	$ 27,521	$ 21,255
Other Comprehensive Income, Net of Tax:
Net Unrealized Securities Holding Gains (Losses) Arising During the Period	(897)	9	(4,017)	465
Reclassification Adjustments for Securities Gains Included in Net Income	0	6	0	6	[1]
Amortization of Net Retirement Plan Actuarial Loss	60	64	181	245
Accretion of Net Retirement Plan Prior Service Credit	20	(2)	60	(5)
Other Comprehensive Income (Loss)	(817)	65	(3,776)	699
Comprehensive Income	$ 8,443	$ 7,481	$ 23,745	$ 21,954
[1]	All amounts are net of tax.

Consolidated Statements of Chan

Consolidated Statements of Changes In Stockholders' Equity - USD ($) $ in Thousands		Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Unallocated ESOP Shares	Accumulated Other Comprehensive Loss		Treasury Stock
Stockholders' Equity, Beginning Balance at Dec. 31, 2016		$ 232,852	$ 17,943	$ 270,880	$ 28,644	$ (400)	$ (6,834)		$ (77,381)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		21,255			21,255
Other Comprehensive Income (Loss)		699					699	[1]
Stock Dividend			538	16,661	(17,199)
Cash Dividends Paid	[2]	(10,119)			(10,119)
Stock Options Exercised, Net		734		335					399
Shares Issued Under the Directors' Stock Plan		126		84					42
Shares Issued Under the Employee Stock Purchase Plan		351		230					121
Shares Issued for Dividend Reinvestment Plans		1,256		843					413
Stock-Based Compensation Expense		261		261
Purchases of Treasury Stock		(2,767)							(2,767)
Stockholders' Equity, Ending Balance at Sep. 30, 2017		244,648	18,481	289,294	22,581	(400)	(6,135)		(79,173)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Impact of change in accounting policy	[1]						(331)
Impact of change in accounting policy | Accounting Standards Update 2014-09		(102)			(102)
Impact of change in accounting policy | Accounting Standards Update 2016-01		0			331		(331)
Stockholders' Equity, Beginning Balance at Dec. 31, 2017		249,603	18,481	290,219	28,818	(200)	(8,514)		(79,201)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		27,521			27,521
Other Comprehensive Income (Loss)		(3,776)					(3,776)	[1]
Stock Dividend		0	554	21,126	(21,680)
Cash Dividends Paid		(10,630)			(10,630)
Stock Options Exercised, Net		1,977		942					1,035
Shares Issued Under the Directors' Stock Plan		103		72					31
Shares Issued Under the Employee Stock Purchase Plan		368		247					121
Shares Issued for Dividend Reinvestment Plans		1,302		890					412
Stock-Based Compensation Expense		267		267
Purchases of Treasury Stock		(1,823)							(1,823)
Stockholders' Equity, Ending Balance at Sep. 30, 2018		$ 264,810	$ 19,035	$ 313,763	$ 24,258	$ (200)	$ (12,621)		$ (79,425)
[1]	All amounts are net of tax.
[2]	Cash dividends paid per share have been adjusted for the September 27, 2018 3% stock dividend.

Consolidated Statements of Ch_2

Consolidated Statements of Changes In Stockholders' Equity Parenthetical - $ / shares	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Statement of Stockholders' Equity [Abstract]
Common Stock Dividends, in shares	554,264	538,100
Cash Dividends Paid, per Share, in dollars per share	$ 0.728	$ 0.707
Exercised, in shares	91,979	34,489
Shares Issued Under Directors Stock Plan, in shares	2,705	3,927
Shares Issued Under Employee Stock Purchase Plan, in shares	10,801	10,869
Shares Issued for Dividend Reinvestment Plans - Shares	35,947	37,525
Purchase of Treasury Stock, in shares	50,697	83,256

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash Flows from Operating Activities:
Net Income	$ 27,521	$ 21,255
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Provision for Loan Losses	1,961	1,580
Depreciation and Amortization	3,576	4,247
Net Gains on the Sale of Securities Available-for-Sale	0	(10)
Net Gain on Equity Securities	(355)	0
Loans Originated and Held-for-Sale	(3,378)	(14,890)
Proceeds from the Sale of Loans Held-for-Sale	3,620	14,481
Net Gain on the Sale of Loans	(115)	(431)
Net Loss on the Sale of Premises and Equipment, Other Real Estate Owned and Repossessed Assets	155	197
Contributions to Retirement Benefit Plans	(524)	(640)
Deferred Income Tax Benefit	(389)	(20)
Shares Issued Under the Directors’ Stock Plan	103	126
Stock-Based Compensation Expense	267	261
Tax Benefit from Exercise of Stock Options	205	112
Net Increase in Other Assets	(1,030)	(1,689)
Net Increase in Other Liabilities	1,980	1,819
Net Cash Provided By Operating Activities	33,597	26,398
Cash Flows from Investing Activities:
Proceeds from the Sale of Securities Available-for-Sale	0	10,015
Proceeds from the Maturities and Calls of Securities Available-for-Sale	36,663	43,617
Purchases of Securities Available-for-Sale	(84,746)	(22,503)
Proceeds from the Maturities and Calls of Securities Held-to-Maturity	49,721	39,062
Purchases of Securities Held-to-Maturity	(4,506)	(36,018)
Net Increase in Loans	(176,607)	(156,643)
Proceeds from the Sales of Premises and Equipment, Other Real Estate Owned and Repossessed Assets	1,078	830
Purchase of Premises and Equipment	(2,371)	(1,335)
Proceeds from the Sale of a Subsidiary, Net	75	72
Net (Increase) Decrease in Other Investments	(917)	4,208
Net Cash Used By Investing Activities	(181,610)	(118,695)
Cash Flows from Financing Activities:
Net Increase in Deposits	162,739	190,570
Net Increase (Decrease) in Short-Term Federal Home Loan Bank Borrowings	26,000	(90,000)
Net Increase (Decrease) in Short-Term Borrowings	(2,463)	25,583
Repayments of Federal Home Loan Bank Term Advances	(10,000)	0
Purchase of Treasury Stock	(1,823)	(2,767)
Stock Options Exercised, Net	1,977	734
Shares Issued Under the Employee Stock Purchase Plan	368	351
Shares Issued for Dividend Reinvestment Plans	1,302	1,256
Cash Dividends Paid	(10,630)	(10,119)
Net Cash Provided By Financing Activities	167,470	115,608
Net Increase in Cash and Cash Equivalents	19,457	23,311
Cash and Cash Equivalents at Beginning of Period	72,838	57,355
Cash and Cash Equivalents at End of Period	92,295	80,666
Supplemental Disclosures to Statements of Cash Flow Information:
Interest on Deposits and Borrowings	7,946	5,168
Income Taxes	7,493	8,404
Non-cash Investing and Financing Activity:
Transfer of Loans to Other Real Estate Owned and Repossessed Assets	$ 606	$ 1,055

Accounting Policies

Accounting Policies	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Accounting Policies	ACCOUNTING POLICIES In the opinion of the management of Arrow Financial Corporation (Arrow, the Company, we, or us), the accompanying unaudited interim consolidated financial statements contain all of the adjustments necessary to present fairly the financial position as of September 30, 2018 , December 31, 2017 and September 30, 2017 ; the results of operations for the three- and nine-month periods ended September 30, 2018 and 2017 ; the consolidated statements of comprehensive income for the three- and nine-month periods ended September 30, 2018 and 2017 ; the changes in stockholders' equity for the nine -month periods ended September 30, 2018 and 2017 ; and the cash flows for the nine -month periods ended September 30, 2018 and 2017 . All such adjustments are of a normal recurring nature. Management’s Use of Estimates -The preparation of the consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of income and expenses during the reporting period. Our most significant estimate is the allowance for loan losses. Other estimates include the evaluation of other-than-temporary impairment of investment securities, goodwill impairment, pension and other postretirement liabilities and an analysis of a need for a valuation allowance for deferred tax assets. Actual results could differ from those estimates. A material estimate that is particularly susceptible to significant change in the near term is the allowance for loan losses. In connection with the determination of the allowance for loan losses, management obtains appraisals for properties. The allowance for loan losses is management’s best estimate of probable loan losses incurred as of the balance sheet date. While management uses available information to recognize losses on loans, future adjustments to the allowance for loan losses may be necessary based on changes in economic conditions. The unaudited interim consolidated financial statements should be read in conjunction with the audited annual consolidated financial statements of Arrow for the year ended December 31, 2017 , included in Arrow's Annual Report on Form 10-K for the year ended December 31, 2017 . Recently Adopted and Recently Issued Accounting Standards The following accounting standards have been adopted in the first nine months of 2018: ASU 2014-09 "Revenue from Contracts With Customers" (Topic 606) was adopted as of January 1, 2018. For additional information, see Revenue Recognition under Significant Accounting Policy Update in this Note. ASU 2016-01 "Recognition and Measurement of Financial Assets and Financial Liabilities" (Subtopic 825-10) significantly changed the income statement impact of equity investments. For Arrow, the standard became effective for the first quarter of 2018, and requires that equity investments be measured at fair value, with changes in fair value recognized in net income. The cumulative effect of the January 1, 2018 adoption was an increase to retained earnings of $331 thousand with a corresponding decrease to Accumulated Other Comprehensive Loss. For periods prior to January 1, 2018, equity securities were classified as available-for-sale and stated at fair value with unrealized gains and losses reported as a separate component of accumulated other comprehensive income, net of tax. ASU 2016-01 also emphasized the existing requirement to use exit prices to measure fair value for disclosure purposes and clarifies that entities not make use of a practicability exception in determining the fair value of loans. Accordingly, the Company refined the calculation used to determine the disclosed fair value of its loans as part of adopting this standard. See Note 9 to the unaudited interim consolidated financial statements titled Fair Value of Financial Instruments. ASU 2016-15 "Statement of Cash Flows - Classification of Certain Cash Receipts and Cash Payments" (Topic 230) will reduce existing diversity in practice with respect to eight specific cash flow issues. Arrow adopted this ASU in the first quarter of 2018. ASU 2017-01 "Business Combinations" (Topic 805) defines when a set of assets and activities constitutes a business for the purposes of determining whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The amendments in this update allow for a business to consist of inputs, processes, and the ability to create output. For Arrow, the standard became effective in the first quarter of 2018. This update had no effect on its accounting for acquisitions and dispositions of businesses. ASU 2017-07 "Compensation-Retirement Benefits" (Topic 715) improves the presentation of net periodic pension cost and net periodic post-retirement benefit cost by requiring that an employer disaggregate the service cost component from the other components of net benefit cost. For Arrow, the standard became effective in the first quarter of 2018. In accordance with the practical expedient adoption method, for all periods presented Arrow used the amounts disclosed in the retirement plans footnote for the prior period retrospective reclassification of the non-service cost components from salaries and benefits to other operating expenses. The adoption of this change in accounting for pension costs did not have a material impact on its financial position or the results of operations. ASU 2017-09 "Compensation-Stock Compensation" (Topic 718) provides guidance about which changes to the terms and conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. The guidance highlights the requirements for applying modification accounting and the exception criteria relating to changes in share-based payment terms. For Arrow, the standard became effective in the first quarter of 2018. The adoption of this change in accounting for share-based payment awards did not have a material impact on its financial position or the results of operations in periods subsequent to its adoption. The following accounting standards have been issued and will become effective for the Company at a future date: In February 2016, the FASB issued ASU 2016-02, "Leases" (Topic 842) which requires lessees to recognize right-of-use assets and lease liabilities on the balance sheet for all leases with terms longer than 12 months. For a lease with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize a right-of-use asset and lease liability. Additionally, when measuring assets and liabilities arising from a lease, optional payments should be included only if the lessee is reasonably certain to exercise an option to extend the lease, exercise a purchase option or not exercise an option to terminate the lease. In January 2018, the FASB issued ASU 2018-01, Leases (Topic 842): "Land Easement Practical Expedient for Transition to Topic 842". In July 2018, the FASB issued ASU 2018-10 "Codification Improvements to Topic 842, Leases" which provided clarification on certain components of the original guidance, including that the rate implicit in the lease cannot be less than zero. Also in July 2018, the FASB issued ASU 2018-11 "Targeted Improvements" to Leases (Topic 842) which amends the original guidance to allow for the adoption of this standard to be applied retrospectively at the beginning of the period of adoption, which will be January 1, 2019 for Arrow, through a cumulative-effect adjustment to the balance sheet, including retained earnings, as of January 1, 2019. Practical expedients may be elected that would not require Arrow to reassess whether an existing contract contains a lease, to reassess existing leases between operating leases and finance leases and to not reassess initial direct costs for any existing leases. If elected, these practical expedients must be applied together. An entity may also elect a practical expedient, which must be applied consistently to all of its leases, to use hindsight in determining the lease term when considering lessee options to extend or terminate the lease and in assessing impairment in the right-of-use asset. In addition, a lessor may make an accounting policy election, by class of underlying asset, to not separate nonlease components from lease components and account for these components as a single lease component. Early adoption of this standard is permitted in any interim or annual period. The Company expects to adopt the new lease standard on January 1, 2019 through a cumulative-effect adjustment without revising prior comparative periods, and elect the practical expedients available to effectively account for leases commenced prior to the effective date. The Company expects assets and liabilities to increase between $7 million and $9 million at the January 1, 2019 adoption date, with no material impact to operating lease expense in its Consolidated Statements of Income. In June 2016, the FASB issued ASU 2016-13 "Financial Instruments - Credit Losses" (Topic 326) which will change the way financial entities measure expected credit losses for financial assets, primarily loans. Under this ASU, the "incurred loss" model will be replaced with an "expected loss" model which will recognize losses over the life of the instrument and requires consideration of a broader range of reasonable and supportable information. Currently, credit losses on available-for-sale securities reduce the carrying value of the instrument and cannot be reversed. Under this ASU, the amount of the credit loss is carried as a valuation allowance and can be reversed. The standard also requires expanded credit quality disclosures. For Arrow, the standard is effective for the first quarter of 2020 and early adoption is allowed in 2019. The Company plans on adopting the standard in the first quarter of 2020, in order to maximize the accumulation of data needed to calculate the new current expected credit loss ("CECL") methodologies. The ASU describes several acceptable methodologies for calculating expected losses on a loan or a pool of loans and requires additional disclosures. The initial adjustment will not be reported in earnings, but as the cumulative effect of a change in accounting principle. The FASB’s Transition Research Group for credit losses still has several outstanding unresolved questions, some of which may have a significant impact on CECL calculations. The Company continues its implementation efforts with the development and testing of various methods within its core model, developing forecast scenarios, monitoring of guidance interpretations and consideration of relevant internal controls and processes. This will likely have the effect of increasing the allowance for loan and lease losses and reducing shareholders' equity, the extent of which will depend upon the nature and characteristics of the Company's loan portfolio and economic conditions and forecasts at the adoption date. The Company expects to remain a well-capitalized financial institution under current regulatory calculations. In January 2017, the FASB issued ASU 2017-04 "Intangibles-Goodwill and Other" (Topic 350) which simplifies the procedures for evaluating impairment of goodwill. Prior to the adoption of this standard, entities were required to perform procedures to determine the fair value of the underlying assets and liabilities for determining the fair value of assets and liabilities in a business combination. This additional step to impairment testing has been eliminated. Under this ASU, entities will perform goodwill impairment testing by comparing the fair value of a reporting unit to its carrying value. For Arrow, the standard becomes effective in the first quarter of 2019, however, early adoption is permitted. This amendment will not affect the assessment of goodwill impairment since the Company currently performs the analysis of comparing carrying value to fair value of its reporting units that have goodwill and the Company has not had to perform a Step 2 Impairment Test to date. In March 2017, the FASB issued ASU 2017-08 "Receivables-Nonrefundable Fees and Other Costs" which amends the amortization period for certain purchased callable debt securities held at a premium. This shortens the amortization period for the premium to the earliest call date. Under GAAP, entities generally amortize the premium as an adjustment of yield over the contractual life of the instrument. For Arrow, the standard becomes effective in the first quarter of 2019. The Company does not expect that the adoption of this change in accounting for certain callable debt securities will have a material impact on its financial position or the results of operations in periods subsequent to its adoption. In August 2018, the FASB issued ASU 2018-13 "Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement" which as part of its disclosure framework, the FASB has eliminated, amended and added disclosure requirements for fair value measurements. The following disclosure requirements were eliminated: Amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy; the policy of the timing of transfers between levels of the fair value hierarchy; the valuation processes for Level 3 fair value measurements. For public companies such as Arrow, the following new disclosures will be required: Changes in unrealized gains and losses for the period included in other comprehensive income (OCI); the range and weighted average of significant unobservable inputs used; alternatively, a company may choose to disclose other quantitative information if it determines that it is a more reasonable and rational method that reflects the distribution of unobservable inputs used. For Arrow, the standard becomes effective in the first quarter of 2020. The Company does not expect that the adoption of this change in fair value disclosure will have a material impact on its financial position or the results of operations in periods subsequent to its adoption. In August 2018, the FASB issued ASU 2018-14 "Disclosure Framework-Changes to the Disclosure Requirements for Defined Benefit Plans" which applies to all companies that provide defined benefit pension or other postretirement benefit plans for their employees. Certain disclosure requirements have been eliminated such as reporting the amounts in accumulated other comprehensive income expected to be recognized as components of net periodic benefit cost over the next year, and reporting the effects of a one-percentage-point change in the assumed healthcare cost trend rate on the aggregate of the service cost and interest cost components of net periodic benefit cost and on the benefit obligation for postretirement healthcare benefits. New required disclosures for reporting the weighted-average interest rate used to credit cash balance and similar plans that have a promised interest credit, the reasons for significant gains and losses affecting benefit obligations and other requirements for reporting aggregate information related to pension plans. For Arrow, the standard becomes effective at December 31, 2020. The Company does not expect that the adoption of this change affecting defined benefit plan disclosures will have a material impact on its financial position or the results of operations. In August 2018, the FASB issued ASU 2018-15 "Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract" which will require companies to defer potentially significant, specified implementation costs incurred in a cloud computing arrangement that are often expensed under current US GAAP. For Arrow, the standard becomes effective at January 1, 2020. The Company is in the process of assessing the impact of this new accounting standard on its financial position and the results of operations in periods subsequent to its adoption. Significant Accounting Policy Update: Revenue Recognition - Accounting Standard Codification ("ASC") Topic 606, "Revenue from Contracts with Customers," establishes principles for reporting information about the nature, amount, timing and uncertainty of revenue and cash flows arising from the entity's contracts to provide goods or services to customers. The core principle of Topic 606 requires an entity to recognize revenue in a way that depicts the transfer of goods or services promised to a customer in an amount that reflects the consideration the entity expects to receive in exchange for those goods or services as performance obligations are satisfied. The Company adopted Topic 606 as of January 1, 2018 using the modified retrospective approach. The Company has determined that revenue from specific types of fiduciary activities and insurance commissions are within the scope of this guidance. Under prior GAAP, revenue from fiduciary activities was recognized from settling client estates over the time period the work was performed. With the adoption of Topic 606, revenue is now recognized when the performance obligation is completed, which is when the settlement of the client estate is closed. The impact of this change in revenue recognition was not material to the Company's consolidated financial statements. Under prior GAAP when clients elected to pay premiums on property and casualty insurance policies in installments, revenue was recognized when the premiums were billed. With the adoption of Topic 606, this type of revenue is recognized when the performance obligation is substantially completed, i.e., when the insurance policy is issued. The impact of this change in revenue recognition was not material to the Company's consolidated financial statements. The cumulative effect of the adoption of Topic 606 related to the previously described fiduciary activities and insurance commissions was a decrease in retained earnings by $102 thousand as of January 1, 2018. The majority of the Company's revenue-generating transactions are not subject to ASC Topic 606, including revenue generated from financial instruments, such as loans and investment securities which are presented in its consolidated income statements as components of net interest income. The following is a description of principal activities from which the Company generates its revenue from noninterest income sources that are within the scope of ASC Topic 606: Income from Fiduciary Activities: represents revenue derived mainly through the management of client investments which is based on the market value of the covered assets and the fee schedule contained in the applicable account management agreement. Since the revenue is mainly based on the market value of assets, this amount can be volatile as financial markets increase and decrease based on various economic factors. The terms of the account management agreements generally specify that the performance obligations are completed each quarter. Accordingly, the Company mainly recognizes revenue from fiduciary activities on a quarterly basis. Fees for Other Services to Customers: represents general service fees for monthly deposit account maintenance and account activity plus fees from other deposit-based services. Revenue is recognized when the performance obligation is completed, which is generally on a monthly basis for account maintenance services, or upon the completion of a deposit-related transaction. Payment for these performance obligations is generally received at the time the performance obligations are satisfied. Insurance Commissions: represents commissions and fees paid by insurance carriers for both property and casualty insurance policies, and for services performed for employment benefits clients. Revenue from the property and casualty insurance business is recognized when the performance obligation is satisfied, which is generally the effective date of the bound coverage since there are no significant performance obligations remaining. Revenue from the employment benefit brokerage business is recognized when the benefit servicing performance obligations are satisfied, generally on a monthly basis.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Investment Securities	INVESTMENT SECURITIES (In Thousands) Management determines the appropriate classification of securities at the time of purchase. Securities reported as held-to-maturity are those debt securities which Arrow has both the positive intent and ability to hold to maturity and are stated at amortized cost. Securities available-for-sale are reported at fair value, with unrealized gains and losses reported in accumulated other comprehensive income or loss, net of taxes. Beginning January 1, 2018, upon adoption of ASU 2016-01, equity securities with readily determinable fair values are stated at fair value with realized and unrealized gains and losses reported in income. For periods prior to January 1, 2018, equity securities were classified as available-for-sale and stated at fair value with unrealized gains and losses reported as a separate component of accumulated other comprehensive income, net of tax. The following table is the schedule of Available-For-Sale Securities at September 30, 2018 , December 31, 2017 and September 30, 2017 : Available-For-Sale Securities U.S. Government & Agency Obligations State and Municipal Obligations Mortgage- Backed Securities Corporate and Other Debt Securities Mutual Funds and Equity Securities Total Available- For-Sale Securities September 30, 2018 Available-For-Sale Securities, at Amortized Cost $ 60,135 $ 2,545 $ 284,236 $ 1,000 $ — $ 347,916 Available-For-Sale Securities, at Fair Value 59,602 2,548 277,461 800 — 340,411 Gross Unrealized Gains — 3 201 — — 204 Gross Unrealized Losses 533 — 6,976 200 — 7,709 Available-For-Sale Securities, Pledged as Collateral 219,587 Maturities of Debt Securities, at Amortized Cost: Within One Year $ 42,621 $ 1,346 $ 1,024 $ — $ 44,991 From 1 - 5 Years 17,514 719 164,808 — 183,041 From 5 - 10 Years — — 103,597 — 103,597 Over 10 Years — 480 14,807 1,000 16,287 Maturities of Debt Securities, at Fair Value: Within One Year $ 42,410 $ 1,346 $ 1,025 $ — $ 44,781 From 1 - 5 Years 17,192 722 158,846 — 176,760 From 5 - 10 Years — — 102,800 — 102,800 Over 10 Years — 480 14,790 800 16,070 Securities in a Continuous Loss Position, at Fair Value: Less than 12 Months $ 4,831 $ 1,120 $ 167,718 $ — $ — $ 173,669 12 Months or Longer 54,771 — 71,433 800 — 127,004 Total $ 59,602 $ 1,120 $ 239,151 $ 800 $ — $ 300,673 Number of Securities in a Continuous Loss Position 14 5 90 1 — 110 Unrealized Losses on Securities in a Continuous Loss Position: Less than 12 Months $ 193 $ — $ 3,165 $ — $ — $ 3,358 12 Months or Longer 340 — 3,811 200 — 4,351 Total $ 533 $ — $ 6,976 $ 200 $ — $ 7,709 Disaggregated Details: US Treasury Obligations, at Amortized Cost $ — US Treasury Obligations, — US Agency Obligations, 60,135 US Agency Obligations, 59,602 Available-For-Sale Securities U.S. Government & Agency Obligations State and Municipal Obligations Mortgage- Backed Securities Corporate and Other Debt Securities Mutual Funds and Equity Securities Total Available- For-Sale Securities US Government Agency Securities, at Amortized Cost $ 74,160 US Government Agency Securities, at Fair Value 74,098 Government Sponsored Entity Securities, at Amortized Cost 210,076 Government Sponsored Entity 203,363 December 31, 2017 Available-For-Sale Securities, at Amortized Cost $ 60,328 $ 10,351 $ 229,077 $ 1,000 $ 1,120 $ 301,876 Available-For-Sale Securities, at Fair Value 59,894 10,349 227,596 800 1,561 300,200 Gross Unrealized Gains — 9 485 — 441 935 Gross Unrealized Losses 434 11 1,966 200 — 2,611 Available-For-Sale Securities, Pledged as Collateral, at Fair Value 183,052 Securities in a Continuous Loss Position, at Fair Value: Less than 12 Months $ 20,348 $ 8,498 $ 70,930 $ — $ — $ 99,776 12 Months or Longer 39,546 — 80,759 800 — 121,105 Total $ 59,894 $ 8,498 $ 151,689 $ 800 $ — $ 220,881 Number of Securities in a Continuous Loss Position 14 36 55 1 — 106 Unrealized Losses on Securities in a Continuous Loss Position: Less than 12 Months $ 172 $ 11 $ 363 $ — $ — $ 546 12 Months or Longer 262 — 1,603 200 — 2,065 Total $ 434 $ 11 $ 1,966 $ 200 $ — $ 2,611 Disaggregated Details: US Treasury Obligations, at Amortized Cost $ — US Treasury Obligations, — US Agency Obligations, 60,328 US Agency Obligations, 59,894 US Government Agency Securities, at Amortized Cost $ 40,832 US Government Agency Securities, at Fair Value 40,832 Government Sponsored Entity Securities, at Amortized Cost 188,245 Government Sponsored Entity 186,764 Available-For-Sale Securities U.S. Government & Agency Obligations State and Municipal Obligations Mortgage- Backed Securities Corporate and Other Debt Securities Mutual Funds and Equity Securities Total Available- For-Sale Securities September 30, 2017 Available-For-Sale Securities, at Amortized Cost $ 146,976 $ 11,875 $ 152,858 $ 2,500 $ 1,120 $ 315,329 Available-For-Sale Securities, at Fair Value 146,978 11,902 152,806 2,299 1,474 315,459 Gross Unrealized Gains 152 27 964 — 354 1,497 Gross Unrealized Losses 150 — 1,016 201 — 1,367 Available-For-Sale Securities, Pledged as Collateral 206,637 Securities in a Continuous Loss Position, at Fair Value: Less than 12 Months $ 89,563 $ — $ 85,091 $ 500 $ — $ 175,154 12 Months or Longer — — — 1,800 — 1,800 Total $ 89,563 $ — $ 85,091 $ 2,300 $ — $ 176,954 Number of Securities in a Continuous Loss Position 23 — 31 3 — 57 Unrealized Losses on Securities in a Continuous Loss Position: Less than 12 Months $ 150 $ — $ 1,016 $ — $ — $ 1,166 12 Months or Longer — — — 201 — 201 Total $ 150 $ — $ 1,016 $ 201 $ — $ 1,367 Disaggregated Details: US Treasury Obligations, $ 64,711 US Treasury Obligations, $ 64,730 US Agency Obligations, $ 82,265 US Agency Obligations, 82,248 US Government Agency Securities, at Amortized Cost $ 503 US Government Agency Securities, at Fair Value 505 Government Sponsored Entity Securities, at Amortized Cost 152,355 Government Sponsored Entity 152,301 The following table is the schedule of Held-To-Maturity Securities at September 30, 2018 , December 31, 2017 and September 30, 2017 : Held-To-Maturity Securities State and Municipal Obligations Mortgage- Backed Securities Corporate and Other Debt Securities Total Held-To Maturity Securities September 30, 2018 Held-To-Maturity Securities, at Amortized Cost $ 239,367 $ 50,585 $ — $ 289,952 Held-To-Maturity Securities, at Fair Value 233,557 49,162 — 282,719 Gross Unrealized Gains 261 — — 261 Gross Unrealized Losses 6,071 1,423 — 7,494 Held-To-Maturity Securities, Pledged as Collateral 268,229 Maturities of Debt Securities, at Amortized Cost: Within One Year $ 19,381 $ — $ — $ 19,381 From 1 - 5 Years 93,084 48,039 — 141,123 From 5 - 10 Years 124,277 2,546 — 126,823 Over 10 Years 2,625 — — 2,625 Maturities of Debt Securities, at Fair Value: Within One Year $ 19,396 $ — $ — $ 19,396 From 1 - 5 Years 92,199 46,688 — 138,887 From 5 - 10 Years 119,356 2,474 — 121,830 Over 10 Years 2,606 — — 2,606 Securities in a Continuous Loss Position, at Fair Value: Less than 12 Months $ 95,944 $ 46,375 $ — $ 142,319 12 Months or Longer 86,378 2,787 — 89,165 Total $ 182,322 $ 49,162 $ — $ 231,484 Number of Securities in a Continuous Loss Position 535 47 — 582 Unrealized Losses on Securities in a Continuous Loss Position: Less than 12 Months $ 1,443 $ 1,303 $ — $ 2,746 12 Months or Longer 4,628 120 — 4,748 Total $ 6,071 $ 1,423 $ — $ 7,494 Disaggregated Details: US Government Agency Securities, at Amortized Cost $ 3,147 US Government Agency Securities, at Fair Value 2,222 Government Sponsored Entity Securities, at Amortized Cost 47,438 Government Sponsored Entity 46,940 Held-To-Maturity Securities State and Municipal Obligations Mortgage- Backed Securities Corporate and Other Debt Securities Total Held-To Maturity Securities December 31, 2017 Held-To-Maturity Securities, at Amortized Cost $ 275,530 $ 60,377 $ — $ 335,907 Held-To-Maturity Securities, at Fair Value 275,353 60,548 — 335,901 Gross Unrealized Gains 1,691 269 — 1,960 Gross Unrealized Losses 1,868 98 — 1,966 Held-To-Maturity Securities, Pledged as Collateral 318,622 Securities in a Continuous Loss Position, at Fair Value: Less than 12 Months $ 55,648 $ 13,764 $ — $ 69,412 12 Months or Longer 65,152 3,257 — 68,409 Total $ 120,800 $ 17,021 $ — $ 137,821 Number of Securities in a Continuous Loss Position 352 14 — 366 Unrealized Losses on Securities in a Continuous Loss Position: Less than 12 Months $ 442 $ 56 $ — $ 498 12 Months or Longer 1,425 43 — 1,468 Total $ 1,867 $ 99 $ — $ 1,966 Disaggregated Details: US Government Agency Securities, at Amortized Cost $ 2,680 US Government Agency Securities, at Fair Value 2,661 Government Sponsored Entity Securities, at Amortized Cost 57,697 Government Sponsored Entity 57,887 September 30, 2017 Held-To-Maturity Securities, at Amortized Cost $ 277,738 $ 63,788 $ — $ 341,526 Held-To-Maturity Securities, at Fair Value 279,384 64,515 — 343,899 Gross Unrealized Gains 2,977 738 — 3,715 Gross Unrealized Losses 1,331 11 — 1,342 Held-To-Maturity Securities, Pledged as Collateral 325,096 Securities in a Continuous Loss Position, at Fair Value: Less than 12 Months $ 78,238 $ 3,544 $ — $ 81,782 12 Months or Longer 13,331 — — 13,331 Total $ 91,569 $ 3,544 $ — $ 95,113 Number of Securities in a Continuous Loss Position 252 7 — 259 Unrealized Losses on Securities in a Continuous Loss Position: Less than 12 Months $ 1,034 $ 11 $ — $ 1,045 12 Months or Longer 297 — — 297 Total $ 1,331 $ 11 $ — $ 1,342 Held-To-Maturity Securities State and Municipal Obligations Mortgage- Backed Securities Corporate and Other Debt Securities Total Held-To Maturity Securities September 30, 2017 Disaggregated Details: US Government Agency Securities, at Amortized Cost $ 2,792 US Government Agency Securities, at Fair Value 2,799 Government Sponsored Entity Securities, at Amortized Cost 60,996 Government Sponsored Entity 61,716 In the tables above, maturities of mortgage-backed securities are included based on their expected average lives. Actual maturities will differ from the table above because issuers may have the right to call or prepay obligations with, or without, prepayment penalties. Securities in a continuous loss position, in the tables above for September 30, 2018 , December 31, 2017 and September 30, 2017 , do not reflect any deterioration of the credit worthiness of the issuing entities. The state and municipal obligations are general obligations supported by the general taxing authority of the issuer, and in some cases are insured. Obligations issued by school districts are supported by state aid. An in-house credit analysis is performed for municipal securities based upon data that has been submitted by the issuers to the New York State Comptroller. That analysis reflects satisfactory credit worthiness of the municipalities. Subsequent to September 30, 2018 , and through the date of the filing of this Quarterly Report on Form 10-Q, Arrow held no securities with significant credit deterioration. The unrealized losses on temporarily impaired securities are primarily the result of changes in interest rates for fixed rate securities where the interest rate received is less than the current rate available for new offerings of similar securities, changes in market spreads as a result of shifts in supply and demand, and/or changes in the level of prepayments for mortgage related securities. Because Arrow does not currently intend to sell any temporarily impaired securities, and because it is not more likely-than-not that the Company would be required to sell the securities prior to recovery, the impairment is considered temporary. The following table is the schedule of Equity Securities at September 30, 2018 . Upon the adoption of ASU 2016-01 effective January 1, 2018, Equity Securities are not included in Securities Available-For-Sale since unrealized gains and losses are now recorded in the Consolidated Statements of Income. Prior to January 1, 2018, Equity Securities were included in Securities Available-For-Sale. Equity Securities September 30, 2018 Equity Securities, at Fair Value $ 1,916 The following is a summary of realized and unrealized gains and losses recognized in net income on equity securities during the three- and nine-month periods ended September 30, 2018 : Three months ended September 30, 2018 Nine months ended September 30, 2018 Net Gain on Equity Securities $ 114 $ 355 Less: Net gain (loss) recognized during the reporting period on equity securities sold during the period — — Unrealized net gain recognized during the reporting period on equity securities still held at the reporting date $ 114 $ 355

Loans

Loans	9 Months Ended
	Sep. 30, 2018
Loans and Leases Receivable Disclosure [Abstract]
Loans	LOANS (In Thousands) Loan Categories and Past Due Loans The following table presents loan balances outstanding as of September 30, 2018 , December 31, 2017 and September 30, 2017 and an analysis of the recorded investment in loans that are past due at these dates. Generally, Arrow considers an amortizing loan past due 30 or more days when the borrower is two payments past due. Loans held-for-sale of $201 , $327 and $1,323 as of September 30, 2018 , December 31, 2017 and September 30, 2017 , respectively, are included in the residential real estate balances for current loans. Commercial Commercial Real Estate Consumer Residential Total September 30, 2018 Loans Past Due 30-59 Days $ 198 $ — $ 5,651 $ 2,896 $ 8,745 Loans Past Due 60-89 Days — — 1,307 47 1,354 Loans Past Due 90 or more Days 76 807 494 1,523 2,900 Total Loans Past Due 274 807 7,452 4,466 12,999 Current Loans 126,838 469,315 686,736 830,212 2,113,101 Total Loans $ 127,112 $ 470,122 $ 694,188 $ 834,678 $ 2,126,100 Loans 90 or More Days Past Due and Still Accruing Interest $ — $ — $ 192 $ 980 $ 1,172 Nonaccrual Loans 674 807 540 2,447 4,468 December 31, 2017 Loans Past Due 30-59 Days $ 139 $ — $ 5,891 $ 2,094 $ 8,124 Loans Past Due 60-89 Days 19 — 1,215 509 1,743 Loans Past Due 90 or more Days 99 807 513 1,422 2,841 Total Loans Past Due 257 807 7,619 4,025 12,708 Current Loans 128,992 443,441 595,208 770,421 1,938,062 Total Loans $ 129,249 $ 444,248 $ 602,827 $ 774,446 $ 1,950,770 Loans 90 or More Days Past Due and Still Accruing Interest $ — $ — $ 6 $ 313 $ 319 Nonaccrual Loans $ 588 $ 1,530 $ 653 $ 2,755 5,526 September 30, 2017 Loans Past Due 30-59 Days $ 122 $ 442 $ 4,781 $ 1,675 $ 7,020 Loans Past Due 60-89 Days — — 914 77 991 Loans Past Due 90 or more Days 102 807 291 1,742 2,942 Total Loans Past Due 224 1,249 5,986 3,494 10,953 Current Loans 125,136 439,467 586,043 747,200 1,897,846 Total Loans $ 125,360 $ 440,716 $ 592,029 $ 750,694 $ 1,908,799 Loans 90 or More Days Past Due and Still Accruing Interest $ — $ — $ 41 $ 926 $ 967 Nonaccrual Loans $ 609 $ 1,249 $ 507 $ 3,117 5,482 The Company disaggregates its loan portfolio into the following four categories: Commercial - The Company offers a variety of loan options to meet the specific needs of commercial customers including term loans, time notes and lines of credit. Such loans are made available to businesses for working capital needs such as inventory and receivables, business expansion and equipment purchases. Generally, a collateral lien is placed on equipment or other assets owned by the borrower. These loans carry a higher risk than commercial real estate loans due to the nature of the underlying collateral, which can be business assets such as equipment and accounts receivable and generally have a lower liquidation value than real estate. In the event of default by the borrower, the Company may be required to liquidate collateral at deeply discounted values. To reduce the risk, management usually obtains personal guarantees of the borrowers. Commercial Real Estate - The Company offers commercial real estate loans to finance real estate purchases, refinancings, expansions and improvements to commercial properties. Commercial real estate loans are made to finance the purchases of real property which generally consists of real estate with completed structures. These commercial real estate loans are secured by first liens on the real estate, which may include apartments, commercial structures, housing businesses, healthcare facilities, and both owner- and non-owner-occupied facilities. These loans are typically less risky than commercial loans, since they are secured by real estate and buildings, and are generally originated in amounts of no more than 80% of the appraised value of the property. However, the Company also offers commercial construction and land development loans to finance projects, primarily within the communities that we serve. Many projects will ultimately be used by the borrowers' businesses, while others are developed for resale. These real estate loans are also secured by first liens on the real estate, which may include apartments, commercial structures, housing business, healthcare facilities and both owner-occupied and non-owner-occupied facilities. There is enhanced risk during the construction period, since the loan is secured by an incomplete project. Consumer Loans - The Company offers a variety of consumer installment loans to finance personal expenditures. Most of these loans carry a fixed rate of interest with principal repayment terms typically ranging from one to five years, based upon the nature of the collateral and the size of the loan. In addition to installment loans, the Company also offers personal lines of credit and overdraft protection. Several loans are unsecured, which carry a higher risk of loss. Also included in this category are automobile loans. The Company primarily finances the purchases of automobiles indirectly through dealer relationships located throughout upstate New York and Vermont. Most of these loans carry a fixed rate of interest with principal repayment terms typically ranging from three to seven years. Indirect consumer loans are underwritten on a secured basis using the underlying collateral being financed. Residential - Residential real estate loans consist primarily of loans secured by first or second mortgages on primary residences. The Company originates adjustable-rate and fixed-rate one-to-four-family residential real estate loans for the construction, purchase or refinancing of an existing mortgage. These loans are collateralized primarily by owner-occupied properties generally located in the Company’s market area. Loans on one-to-four-family residential real estate are generally originated in amounts of no more than 80% of the purchase price or appraised value (whichever is lower), or have private mortgage insurance. The Company’s underwriting analysis for residential mortgage loans typically includes credit verification, independent appraisals, and a review of the borrower’s financial condition. Mortgage title insurance and hazard insurance are normally required. It is the Company's general practice to underwrite residential real estate loans to secondary market standards. Construction loans have a unique risk, because they are secured by an incomplete dwelling. This risk is reduced through periodic site inspections, including one at each loan draw period. In addition, the Company offers fixed home equity loans as well as home equity lines of credit to consumers to finance home improvements, debt consolidation, education and other uses. The Company's policy allows for a maximum loan to value ratio of 80%, although periodically higher advances are allowed. The Company originates home equity lines of credit and second mortgage loans (loans secured by a second junior lien position on one-to-four-family residential real estate). Risk is generally reduced through underwriting criteria, which include credit verification, appraisals, a review of the borrower's financial condition, and personal cash flows. A security interest, with title insurance when necessary, is taken in the underlying real estate. Allowance for Loan Losses The following table presents a roll-forward of the allowance for loan losses and other information pertaining to the allowance for loan losses: Allowance for Loan Losses Commercial Commercial Real Estate Consumer Residential Total Roll-forward of the Allowance for Loan Losses for the Quarterly Periods: June 30, 2018 $ 944 $ 5,838 $ 8,337 $ 4,521 $ 19,640 Charge-offs — — (300 ) (25 ) (325 ) Recoveries — — 102 — 102 Provision 99 81 551 (145 ) 586 September 30, 2018 $ 1,043 $ 5,919 $ 8,690 $ 4,351 $ 20,003 June 30, 2017 $ 925 $ 4,983 $ 7,305 $ 4,229 $ 17,442 Charge-offs — (342 ) (280 ) — (622 ) Recoveries 1 — 74 — 75 Provision (46 ) 446 509 (109 ) 800 September 30, 2017 $ 880 $ 5,087 $ 7,608 $ 4,120 $ 17,695 Allowance for Loan Losses Commercial Commercial Real Estate Consumer Residential Total Roll-forward of the Allowance for Loan Losses for the Year-to-Date Periods: December 31, 2017 $ 1,873 $ 4,504 $ 7,604 $ 4,605 $ 18,586 Charge-offs (16 ) — (895 ) (49 ) (960 ) Recoveries 1 12 403 — 416 Provision (815 ) 1,403 1,578 (205 ) 1,961 September 30, 2018 $ 1,043 $ 5,919 $ 8,690 $ 4,351 $ 20,003 December 31, 2016 $ 1,017 $ 5,677 $ 6,120 $ 4,198 $ 17,012 Charge-offs (2 ) (342 ) (847 ) (6 ) (1,197 ) Recoveries 8 — 292 — 300 Provision (143 ) (248 ) 2,043 (72 ) 1,580 September 30, 2017 $ 880 $ 5,087 $ 7,608 $ 4,120 $ 17,695 September 30, 2018 Allowance for loan losses - Loans Individually Evaluated for Impairment $ 84 $ 45 $ — $ 48 $ 177 Allowance for loan losses - Loans Collectively Evaluated for Impairment 959 5,874 8,690 4,303 19,826 Ending Loan Balance - Individually Evaluated for Impairment 489 812 109 2,013 3,423 Ending Loan Balance - Collectively Evaluated for Impairment $ 126,623 $ 469,310 $ 694,079 $ 832,665 $ 2,122,677 December 31, 2017 Allowance for loan losses - Loans Individually Evaluated for Impairment $ 94 $ 2 $ — $ 10 $ 106 Allowance for loan losses - Loans Collectively Evaluated for Impairment 1,779 4,502 7,604 4,595 18,480 Ending Loan Balance - Individually Evaluated for Impairment 489 1,537 95 1,562 3,683 Ending Loan Balance - Collectively Evaluated for Impairment $ 128,760 $ 442,711 $ 602,732 $ 772,884 $ 1,947,087 September 30, 2017 Allowance for loan losses - Loans Individually Evaluated for Impairment $ 104 $ — $ — $ 34 $ 138 Allowance for loan losses - Loans Collectively Evaluated for Impairment 776 5,087 7,608 4,086 17,557 Ending Loan Balance - Individually Evaluated for Impairment 489 1,543 104 1,139 3,275 Ending Loan Balance - Collectively Evaluated for Impairment $ 124,871 $ 439,172 $ 591,925 $ 749,556 $ 1,905,524 Through the provision for loan losses, an allowance for loan losses is maintained that reflects the best estimate of the incurred risk of loss in the Company’s loan portfolio as of the balance sheet date. Additions are made to the allowance for loan losses through a periodic provision for loan losses. Actual loan losses are charged against the allowance for loan losses when loans are deemed uncollectible and recoveries of amounts previously charged off are recorded as credits to the allowance for loan losses. Loan officers and risk managers meet at least quarterly to discuss and review the conditions and risks associated with certain criticized and classified commercial-related relationships. In addition, the Company's independent internal loan review department performs periodic reviews of the credit quality indicators on individual loans in the commercial loan portfolio. The Company uses a two-step process to determine the provision for loan losses and the amount of the allowance for loan losses. The Company performs an evaluation of impaired loans on a quarterly basis. Impaired loans are generally nonaccrual loans over $250 thousand and all troubled debt restructured loans. These impaired loans are generally considered to be collateral dependent with the charge-off, if any, determined based on the value of the collateral less estimated costs to sell. The remainder of the portfolio is evaluated on a pooled basis, as described below. For each homogeneous loan pool, the Company estimates a total loss factor based on the historical net loss rates adjusted for applicable qualitative factors. The total loss factors assigned to each loan category are updated on a quarterly basis. For the commercial and commercial real estate categories, the loan categories are further segregated by credit risk profile (pools of loans graded pass, special mention and accruing substandard). Additional description of the credit risk classifications is detailed in the Credit Quality Indicators section of this note. The annualized historical net loss rate is determined for each loan category using a trailing three-year net charge-off average. While historical net loss experience provides a reasonable starting point for analysis, historical net losses, or even recent trends in net losses, do not by themselves form a sufficient basis to determine the appropriate level of the allowance for loan losses. Therefore, the Company also considers and adjusts historical net loss factors for qualitative factors that impact the incurred risk of loss associated with the loan categories within the total loan portfolio. These include: • Changes in the volume and severity of past due, nonaccrual and adversely classified loans • Changes in the nature and volume of the portfolio and in the terms of loans • Changes in the value of the underlying collateral for collateral dependent loans • Changes in lending policies and procedures, including changes in underwriting standards and collection, charge-off, and recovery practices not considered elsewhere in estimating credit losses • Changes in the quality of the loan review system • Changes in the experience, ability, and depth of lending management and other relevant staff • Changes in international, national, regional, and local economic and business conditions and developments that affect the collectibility of the portfolio • The existence and effect of any concentrations of credit, and changes in the level of such concentrations • The effect of other external factors such as competition and legal and regulatory requirements on the level of estimated credit losses in the existing portfolio or pool Credit Quality Indicators The following table presents the credit quality indicators by loan category at September 30, 2018 , December 31, 2017 and September 30, 2017 : Loan Credit Quality Indicators Commercial Commercial Real Estate Consumer Residential Total September 30, 2018 Credit Risk Profile by Creditworthiness Category: Satisfactory $ 119,217 $ 440,114 $ — $ — $ 559,331 Special Mention 5,949 — — — 5,949 Substandard 1,946 29,201 — — 31,147 Doubtful — 807 — — 807 Credit Risk Profile Based on Payment Activity: Performing $ — $ — $ 693,648 $ 832,231 $ 1,525,879 Nonperforming — — 540 2,447 2,987 December 31, 2017 Credit Risk Profile by Creditworthiness Category: Satisfactory $ 124,961 $ 417,362 $ — $ — $ 542,323 Special Mention 1,341 177 — — 1,518 Substandard 2,947 25,902 — — 28,849 Doubtful — 807 — — 807 Credit Risk Profile Based on Payment Activity: Performing $ — $ — $ 602,168 $ 771,584 $ 1,373,752 Nonperforming — — 659 3,068 3,727 September 30, 2017 Credit Risk Profile by Creditworthiness Category: Satisfactory $ 120,622 $ 411,685 $ — $ — $ 532,307 Special Mention 1,394 1,401 — — 2,795 Substandard 3,344 26,822 — — 30,166 Doubtful — 807 — — 807 Credit Risk Profile Based on Payment Activity: Performing $ — $ — $ 591,499 $ 746,652 $ 1,338,151 Nonperforming — — 530 4,043 4,573 For the purposes of the table above, nonperforming consumer and residential loans are those loans on nonaccrual status or are 90 days or more past due and still accruing interest. For the allowance calculation, we use an internally developed system of five credit quality indicators to rate the credit worthiness of each commercial loan defined as follows: 1) Satisfactory - "Satisfactory" borrowers have acceptable financial condition with satisfactory record of earnings and sufficient historical and projected cash flow to service the debt. Borrowers have satisfactory repayment histories and primary and secondary sources of repayment can be clearly identified; 2) Special Mention - Loans in this category have potential weaknesses that deserve management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the asset or in the institution’s credit position at some future date. "Special mention" assets are not adversely classified and do not expose an institution to sufficient risk to warrant adverse classification. Loans which might be assigned this credit quality indicator include loans to borrowers with deteriorating financial strength and/or earnings record and loans with potential for problems due to weakening economic or market conditions; 3) Substandard - Loans classified as “substandard” are inadequately protected by the current sound net worth or paying capacity of the borrower or the collateral pledged, if any. Loans in this category have well defined weaknesses that jeopardize the repayment. They are characterized by the distinct possibility that the bank will sustain some loss if the deficiencies are not corrected. “Substandard” loans may include loans which are likely to require liquidation of collateral to effect repayment, and other loans where character or ability to repay has become suspect. Loss potential, while existing in the aggregate amount of substandard assets, does not have to exist in individual assets classified substandard; 4) Doubtful - Loans classified as “doubtful” have all of the weaknesses inherent in those classified as “substandard” with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of current existing facts, conditions, and values highly questionable and improbable. Although possibility of loss is extremely high, classification of these loans as “loss” has been deferred due to specific pending factors or events which may strengthen the value (i.e. possibility of additional collateral, injection of capital, collateral liquidation, debt restructure, economic recovery, etc). Loans classified as “doubtful” need to be placed on non-accrual; and 5) Loss - Loans classified as “loss” are considered uncollectible with collateral of such little value that their continuance as bankable assets is not warranted. As of the date of the balance sheet, all loans in this category have been charged-off to the allowance for loan losses. Commercial loans are generally evaluated on an annual basis depending on the size and complexity of the loan relationship, unless the credit related quality indicator falls to a level of "special mention" or below, when the loan is evaluated quarterly. The credit quality indicator is one of the factors used in assessing the level of incurred risk of loss in our commercial related loan portfolios. Impaired Loans The following table presents information on impaired loans based on whether the impaired loan has a recorded related allowance or has no recorded related allowance: Impaired Loans Commercial Commercial Real Estate Consumer Residential Total September 30, 2018 Recorded Investment: With No Related Allowance $ — $ 5 $ 108 $ 1,712 $ 1,825 With a Related Allowance 475 801 — 346 1,622 Unpaid Principal Balance: With No Related Allowance — 5 109 1,733 1,847 With a Related Allowance 489 807 — 280 1,576 December 31, 2017 Recorded Investment: With No Related Allowance $ — $ 781 $ 94 $ 1,269 $ 2,144 With a Related Allowance 485 725 — 333 1,543 Unpaid Principal Balance: With No Related Allowance — 816 95 1,274 2,185 With a Related Allowance 489 721 — 288 1,498 September 30, 2017 Recorded Investment: With No Related Allowance $ — $ 818 $ 104 $ 851 $ 1,773 With a Related Allowance 489 725 — 288 1,502 Unpaid Principal Balance: With No Related Allowance — 818 90 850 $ 1,758 With a Related Allowance 489 723 — 288 1,500 For the Quarter Ended: September 30, 2018 Average Recorded Balance: With No Related Allowance $ — $ 7 $ 104 $ 1,371 $ 1,482 With a Related Allowance 478 794 — 350 1,622 Interest Income Recognized: With No Related Allowance — — — — — With a Related Allowance — — — — — Cash Basis Income: With No Related Allowance — — — — — With a Related Allowance — — — — — September 30, 2017 Average Recorded Balance: With No Related Allowance $ — $ 998 $ 96 $ 827 $ 1,921 With a Related Allowance 496 363 — 288 1,147 Interest Income Recognized: With No Related Allowance — — 1 — 1 With a Related Allowance — — — — — Cash Basis Income: With No Related Allowance — — — — — With a Related Allowance — — — — — Impaired Loans Commercial Commercial Real Estate Consumer Residential Total For the Year-To-Date Period Ended: September 30, 2018 Average Recorded Balance: With No Related Allowance $ — $ 393 $ 101 $ 1,491 $ 1,985 With a Related Allowance 480 763 — 340 1,583 Interest Income Recognized: With No Related Allowance — — — — — With a Related Allowance — — — 20 20 Cash Basis Income: With No Related Allowance — — — — — With a Related Allowance — — — — — September 30, 2017 Average Recorded Balance: With No Related Allowance $ — $ 854 $ 98 $ 975 $ 1,927 With a Related Allowance 245 363 — 144 752 Interest Income Recognized: With No Related Allowance — — 3 — 3 With a Related Allowance — — — 4 4 Cash Basis Income: With No Related Allowance — — — — — With a Related Allowance — — — — — At September 30, 2018 , December 31, 2017 and September 30, 2017 , all impaired loans were considered to be collateral dependent and were therefore evaluated for impairment based on the fair value of collateral less estimated cost to sell. Interest income recognized in the table above, represents income earned after the loans became impaired and includes restructured loans in compliance with their modified terms and nonaccrual loans where we have recognized interest income on a cash basis. Loans Modified in Trouble Debt Restructurings The following table presents information on loans modified in trouble debt restructurings during the periods indicated. Loans Modified in Trouble Debt Restructurings During the Period Commercial Commercial Real Estate Consumer Residential Total For the Quarter Ended: September 30, 2018 Number of Loans — — 1 — 1 Pre-Modification Outstanding Recorded Investment $ — $ — $ 16 $ — $ 16 Post-Modification Outstanding Recorded Investment — — 16 — 16 Subsequent Default, Number of Contracts — — — — — Subsequent Default, Recorded Investment — — — — — September 30, 2017 Number of Loans 1 — 2 — 3 Pre-Modification Outstanding Recorded Investment $ 725 $ — $ 25 $ — $ 750 Post-Modification Outstanding Recorded Investment 725 — 25 — 750 Subsequent Default, Number of Contracts — — — — — Subsequent Default, Recorded Investment — — — — — For the Year-To-Date Period Ended: September 30, 2018 Number of Loans — — 5 — 5 Pre-Modification Outstanding Recorded Investment $ — $ — $ 44 $ — $ 44 Post-Modification Outstanding Recorded Investment — — 44 — 44 Subsequent Default, Number of Contracts — — — — — Subsequent Default, Recorded Investment — — — — — September 30, 2017 Number of Loans 2 — 6 — 8 Pre-Modification Outstanding Recorded Investment $ 1,228 $ — $ 51 $ — $ 1,279 Post-Modification Outstanding Recorded Investment 1,228 — 51 — 1,279 Subsequent Default, Number of Contracts — — — — — Subsequent Default, Recorded Investment — — — — — In general, loans requiring modification are restructured to accommodate the projected cash-flows of the borrower. Such modifications may involve a reduction of the interest rate, a significant deferral of payments or forgiveness of a portion of the outstanding principal balance. As indicated in the table above, no loans modified during the preceding twelve months subsequently defaulted as of September 30, 2018 .

Guarantees

Guarantees	9 Months Ended
	Sep. 30, 2018
Guarantees [Abstract]
Guarantees	GUARANTEES (In Thousands) The following table presents the notional amount and fair value of Arrow's off-balance sheet commitments to extend credit and commitments under standby letters of credit as of September 30, 2018 , December 31, 2017 and September 30, 2017 : Commitments to Extend Credit and Letters of Credit September 30, 2018 December 31, 2017 September 30, 2017 Notional Amount: Commitments to Extend Credit $ 335,587 $ 315,256 $ 316,449 Standby Letters of Credit 4,016 3,526 3,672 Fair Value: Commitments to Extend Credit $ — $ — $ — Standby Letters of Credit 4 23 18 Arrow is party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit and standby letters of credit. Commitments to extend credit include home equity lines of credit, commitments for residential and commercial construction loans and other personal and commercial lines of credit. These instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the consolidated balance sheets. The contract or notional amounts of those instruments reflect the extent of the involvement Arrow has in particular classes of financial instruments. Arrow's exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit and standby letters of credit is represented by the contractual notional amount of those instruments. Arrow uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments. Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. Arrow evaluates each customer's creditworthiness on a case-by-case basis. Home equity lines of credit are secured by residential real estate. Construction commitments are secured by underlying real estate. For other lines of credit, the amount of collateral obtained, if deemed necessary by Arrow upon extension of credit, is based on management's credit evaluation of the counterparty. Collateral held varies, but may include accounts receivable, inventory, property, plant and equipment, and income-producing commercial properties. Most of the commitments are variable rate instruments. Arrow does not issue any guarantees that would require liability-recognition or disclosure, other than its standby letters of credit. Arrow has issued conditional commitments in the form of standby letters of credit to guarantee payment on behalf of a customer and guarantee the performance of a customer to a third party. Standby letters of credit generally arise in connection with lending relationships. The credit risk involved in issuing these instruments is essentially the same as that involved in extending loans to customers. Contingent obligations under standby letters of credit at September 30, 2018 , December 31, 2017 and September 30, 2017 represent the maximum potential future payments Arrow could be required to make. Typically, these instruments have terms of 12 months or less and expire unused; therefore, the total amounts do not necessarily represent future cash requirements. Each customer is evaluated individually for creditworthiness under the same underwriting standards used for commitments to extend credit and on-balance sheet instruments. Company policies governing loan collateral apply to standby letters of credit at the time of credit extension. Loan-to-value ratios generally range from 50% for movable assets, such as inventory, to 100% for liquid assets, such as bank CD's. Fees for standby letters of credit typically range from 1% to 3% of the notional amount. Fees are collected upfront and are amortized over the life of the commitment. The carrying amount and fair values of Arrow's standby letters of credit at September 30, 2018 , December 31, 2017 and September 30, 2017 , were insignificant. The fair value of standby letters of credit is based on the fees currently charged for similar agreements or the cost to terminate the arrangement with the counterparties. The fair value of commitments to extend credit is determined by estimating the fees to enter into similar agreements, taking into account the remaining terms and present creditworthiness of the counterparties, and for fixed rate loan commitments, the difference between the current and committed interest rates. Arrow provides several types of commercial lines of credit and standby letters of credit to its commercial customers. The pricing of these services is not isolated, as Arrow considers the customer's complete deposit and borrowing relationship in pricing individual products and services. The commitments to extend credit also include commitments under home equity lines of credit, for which Arrow charges no fee. The carrying value and fair value of commitments to extend credit are not material and Arrow does not expect to incur any material loss as a result of these commitments. In the normal course of business, Arrow and its subsidiary banks become involved in a variety of routine legal proceedings. At present, there are no legal proceedings pending or threatened, which in the opinion of management and counsel, would result in a material loss to Arrow.

Comprehensive Income

Comprehensive Income	9 Months Ended
	Sep. 30, 2018
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Comprehensive Income	COMPREHENSIVE INCOME (In Thousands) The following table presents the components of other comprehensive income for the three- and nine-month periods ended September 30, 2018 and 2017 : Schedule of Comprehensive Income Three Months Ended September 30, Nine Months Ended September 30, Tax Tax Before-Tax (Expense) Net-of-Tax Before-Tax (Expense) Net-of-Tax Amount Benefit Amount Amount Benefit Amount 2018 Net Unrealized Securities Holding Losses on Securities Available-for-Sale Arising During the Period (1,203 ) $ 306 (897 ) (5,388 ) $ 1,371 (4,017 ) Amortization of Net Retirement Plan Actuarial Loss 81 (21 ) 60 244 (63 ) 181 Accretion of Net Retirement Plan Prior Service Credit 27 (7 ) 20 81 (21 ) 60 Other Comprehensive Loss $ (1,095 ) $ 278 $ (817 ) $ (5,063 ) $ 1,287 $ (3,776 ) 2017 Net Unrealized Securities Holding Gains on Securities Available-for-Sale Arising During the Period 6 $ 3 9 749 $ (284 ) 465 Reclassification Adjustment for Securities Gains Included in Net Income (10 ) 4 (6 ) (10 ) 4 (6 ) Amortization of Net Retirement Plan Actuarial Loss 179 (115 ) 64 537 (292 ) 245 Accretion of Net Retirement Plan Prior Service Credit (3 ) 1 (2 ) (8 ) 3 (5 ) Other Comprehensive Income $ 172 $ (107 ) $ 65 $ 1,268 $ (569 ) $ 699 The following table presents the changes in accumulated other comprehensive income by component: Changes in Accumulated Other Comprehensive Income (Loss) by Component (1) Unrealized Defined Benefit Plan Items Gains and Losses on Net Prior Available-for- Net Gain Service Sale Securities (Loss) (Cost ) Credit Total For the Quarter-To-Date periods ended: June 30, 2018 $ (4,701 ) $ (6,259 ) $ (844 ) $ (11,804 ) Other comprehensive income or loss before reclassifications (897 ) — — (897 ) Amounts reclassified from accumulated other comprehensive income 60 20 80 Net current-period other comprehensive income (loss) (897 ) 60 20 (817 ) September 30, 2018 $ (5,598 ) $ (6,199 ) $ (824 ) $ (12,621 ) June 30, 2017 $ 74 $ (5,556 ) $ (718 ) $ (6,200 ) Other comprehensive income or loss before reclassifications 9 — — 9 Amounts reclassified from accumulated other comprehensive income (6 ) 64 (2 ) 56 Net current-period other comprehensive income (loss) 3 64 (2 ) 65 September 30, 2017 $ 77 $ (5,492 ) $ (720 ) $ (6,135 ) For the Year-To-Date periods ended: December 31, 2017 $ (1,250 ) $ (6,380 ) $ (884 ) $ (8,514 ) Other comprehensive income or loss before reclassifications (4,017 ) — — (4,017 ) Amounts reclassified from accumulated other comprehensive income — 181 60 241 Net current-period other comprehensive income (4,017 ) 181 60 (3,776 ) Amounts reclassified from accumulated other comprehensive income $ (331 ) $ (331 ) September 30, 2018 $ (5,598 ) $ (6,199 ) $ (824 ) $ (12,621 ) December 31, 2016 $ (382 ) $ (5,737 ) $ (715 ) $ (6,834 ) Other comprehensive income or loss before reclassifications 465 — — 465 Amounts reclassified from accumulated other comprehensive income (6 ) 245 (5 ) 234 Net current-period other comprehensive income 459 245 (5 ) 699 September 30, 2017 $ 77 $ (5,492 ) $ (720 ) $ (6,135 ) (1) All amounts are net of tax. The following table presents the reclassifications out of accumulated other comprehensive income: Reclassifications Out of Accumulated Other Comprehensive Income Amounts Reclassified Details about Accumulated Other from Accumulated Other Affected Line Item in the Statement Comprehensive Income (Loss) Components Comprehensive Income Where Net Income Is Presented For the Quarter-to-date periods ended: September 30, 2018 Unrealized gains and losses on available-for-sale securities $ — Gain on Securities Transactions — Total before Tax — Provision for Income Taxes $ — Net of Tax Amortization of defined benefit pension items: Prior-service costs $ (27 ) (1) Salaries and Employee Benefits Actuarial gains/(losses) (81 ) (1) Salaries and Employee Benefits (108 ) Total before Tax 28 Provision for Income Taxes $ (80 ) Net of Tax Total reclassifications for the period $ (80 ) Net of Tax September 30, 2017 Unrealized gains and losses on available-for-sale securities $ 10 Gain on Securities Transactions 10 Total before Tax (4 ) Provision for Income Taxes $ 6 Net of Tax Amortization of defined benefit pension items: Prior-service costs $ 3 (1) Salaries and Employee Benefits Actuarial gains/(losses) (179 ) (1) Salaries and Employee Benefits (176 ) Total before Tax 114 Provision for Income Taxes $ (62 ) Net of Tax Total reclassifications for the period $ (56 ) Net of Tax For the Year-to-date periods ended: September 30, 2018 Unrealized gains and losses on available-for-sale securities $ — Gain on Securities Transactions — Total before Tax — Provision for Income Taxes $ — Net of Tax Amortization of defined benefit pension items: Prior-service costs $ (81 ) (1) Salaries and Employee Benefits Actuarial gains/(losses) (244 ) (1) Salaries and Employee Benefits (325 ) Total before Tax 84 Provision for Income Taxes $ (241 ) Net of Tax Total reclassifications for the period $ (241 ) Net of Tax Reclassifications Out of Accumulated Other Comprehensive Income Amounts Reclassified Details about Accumulated Other from Accumulated Other Affected Line Item in the Statement Comprehensive Income (Loss) Components Comprehensive Income Where Net Income Is Presented September 30, 2017 Unrealized gains and losses on available-for-sale securities $ 10 Gain on Securities Transactions 10 Total before Tax (4 ) Provision for Income Taxes $ 6 Net of Tax Amortization of defined benefit pension items: Prior-service costs 8 (1) Salaries and Employee Benefits Actuarial gains/(losses) $ (537 ) (1) Salaries and Employee Benefits (529 ) Total before Tax 289 Provision for Income Taxes $ (240 ) Net of Tax Total reclassifications for the period $ (234 ) Net of Tax (1) These accumulated other comprehensive income components are included in the computation of net periodic pension cost.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	STOCK-BASED COMPENSATION (Dollars In Thousands, Except Share and Per Share Amounts) Arrow has established three stock-based compensation plans: an Incentive and Non-qualified Stock Option Plan (Long Term Incentive Plan), an Employee Stock Purchase Plan (ESPP) and an Employee Stock Ownership Plan (ESOP). All share and per share data have been adjusted for the September 27, 2018 3 % stock dividend. Long Term Incentive Plan The Long Term Incentive Plan provides for the grant of incentive stock options, non-qualified stock options, restricted stock, restricted stock units, performance units and performance shares. The Compensation Committee of the Board of Directors administers the Long Term Incentive Plan. Stock Options - Options may be granted at a price no less than the greater of the par value or fair market value of such shares on the date on which such option is granted, and generally expire ten years from the date of grant. The options usually vest over a four -year period. The following table presents the roll forward of stock options issued pursuant to the Long Term Incentive Plan by Shares and Weighted Average Exercise Prices. Roll-Forward of Shares Outstanding: Outstanding at January 1, 2018 356,540 Granted 56,843 Exercised (94,742 ) Forfeited (14,953 ) Outstanding at September 30, 2018 303,688 Exercisable at Period-End 185,547 Vested and Expected to Vest 118,141 Roll-Forward of Shares Outstanding - Weighted Average Exercise Price: Outstanding at January 1, 2018 $ 23.42 Granted 29.95 Exercised 20.85 Forfeited 26.61 Outstanding at September 30, 2018 25.24 Exercisable at Period-End 22.47 Vested and Expected to Vest 29.59 Schedule of Other Long Term Incentive Plan Information Grants Issued During 2018 - Weighted Average Information: Fair Value $ 5.59 Fair Value Assumptions: Dividend Yield 2.98 % Expected Volatility 21.55 % Risk Free Interest Rate 2.68 % Expected Lives (in years) 6.98 Restricted Stock Units - The Company grants restricted stock units which gives the recipient the right to receive shares of Company stock upon vesting. The fair value of each restricted stock unit is the market value of Company stock on the date of grant. 100% of the restricted stock unit awards vest three years from the grant date. Once vested, the restricted stock units become vested units. Unvested restricted stock unit awards will generally be forfeited if the recipient ceases to be employed by the Company, with limited exceptions. The following table presents the roll forward of restricted stock units by units and weighted average grant-date fair value. Roll-Forward of Restricted Stock Units Non-vested at January 1, 2018 — Granted 3,377 Vested — Canceled — Non-vested at September 30, 2018 3,377 Roll-Forward of Non-vested Restricted Stock Units - Weighted Average Fair Value: Non-vested at January 1, 2018 $ — Granted 32.57 Vested — Canceled — Non-vested at September 30, 2018 32.57 The following table presents information on the amounts expensed for the periods ended September 30, 2018 and 2017 : Share-Based Compensation Expense For the Three Months Ended September 30, For the Nine Months Ended September 30, 2018 2017 2018 2017 Share-Based Compensation Expense $ 89 $ 90 $ 267 $ 262 Employee Stock Purchase Plan Arrow sponsors an ESPP under which employees purchase Arrow's common stock at a 5% discount below market price. Under current accounting guidance, a stock purchase plan with a discount of 5% or less is not considered a compensatory plan. Employee Stock Ownership Plan Arrow maintains an ESOP. Substantially all employees of Arrow and its subsidiaries are eligible to participate upon satisfaction of applicable service requirements. The ESOP borrowed funds from one of Arrow’s subsidiary banks to purchase outstanding shares of Arrow’s common stock. The notes require annual payments of principal and interest through 2018. As the debt is repaid, shares are released from collateral based on the proportion of debt paid to total debt outstanding for the year and allocated to active employees. In addition, the Company makes additional cash contributions to the Plan each year. Shares pledged as collateral are reported as unallocated ESOP shares in stockholders' equity. As shares are released from collateral, Arrow reports compensation expense equal to the current average market price of the shares, and the shares become outstanding for earnings per share computations.

Retirement Plans

Retirement Plans	9 Months Ended
	Sep. 30, 2018
Defined Benefit Plan [Abstract]
Retirement Plans	RETIREMENT PLANS (Dollars in Thousands) Arrow sponsors qualified and nonqualified defined benefit pension plans and other postretirement benefit plans for its employees. Arrow maintains a non-contributory pension plan, which covers substantially all employees. Effective December 1, 2002, all active participants in the qualified defined benefit pension plan were given a one-time irrevocable election to continue participating in the traditional plan design, for which benefits were based on years of service and the participant’s final compensation (as defined), or to begin participating in the new cash balance plan design. All employees who participate in the plan after December 1, 2002 automatically participate in the cash balance plan design. The interest credits under the cash balance plan are based on the 30-year U.S. Treasury rate in effect for November of the prior year. The service credits under the cash balance plan are equal to 6.0% of eligible salaries for employees who become participants on or after January 1, 2003. For employees in the plan prior to January 1, 2003, the service credits are scaled based on the age of the participant, and range from 6.0% to 12.0% . The funding policy is to contribute up to the maximum amount that can be deducted for federal income tax purposes and to make all payments required under ERISA. Arrow also maintains a supplemental non-qualified unfunded retirement plan to provide eligible employees of Arrow and its subsidiaries with benefits in excess of qualified plan limits imposed by federal tax law. Arrow has multiple non-pension postretirement benefit plans. The health care, dental and life insurance plans are contributory, with participants’ contributions adjusted annually. Arrow’s policy is to fund the cost of postretirement benefits based on the current cost of the underlying policies. However, the health care plan provision for automatic increases of Company contributions each year is based on the increase in inflation and is limited to a maximum of 5% . As of December 31, 2017, Arrow utilized the mortality assumption from the RP-2014 Mortality Table for annuitants and non-annuitants but updated the projected generational mortality improvements by using Scale MP-2017. Revision of this assumption effective December 31, 2016 resulted in a decrease in the Company's pension and postretirement liabilities. The following tables provide the components of net periodic benefit costs for the three - and nine-month periods ended September 30, 2018 and 2017 . Select Employees' Executive Postretirement Pension Retirement Benefit Plan Plan Plans Net Periodic Benefit Cost For the Three Months Ended September 30, 2018: Service Cost 1 $ 389 $ 104 $ 34 Interest Cost 2 400 48 81 Expected Return on Plan Assets 2 (841 ) — — Amortization of Prior Service (Credit) Cost 2 (12 ) 14 25 Amortization of Net Loss 2 48 33 — Net Periodic (Benefit) Cost $ (16 ) $ 199 $ 140 Plan Contributions During the Period $ — $ 116 $ 56 For the Three Months Ended September 30, 2017: Service Cost 1 $ 350 $ 10 $ 37 Interest Cost 2 362 55 75 Expected Return on Plan Assets 2 (800 ) — — Amortization of Prior Service (Credit) Cost 2 (14 ) 14 (3 ) Amortization of Net Loss 2 148 31 — Net Periodic (Benefit) Cost $ 46 $ 110 $ 109 Plan Contributions During the Period $ — $ 116 $ 65 Net Periodic Benefit Cost For the Nine Months Ended September 30, 2018: Service Cost 1 $ 1,168 $ 311 $ 102 Interest Cost 2 1,199 152 248 Expected Return on Plan Assets 2 (2,522 ) — — Amortization of Prior Service (Credit) Cost 2 (37 ) 43 75 Amortization of Net Loss 2 145 99 — Net Periodic (Benefit) Cost $ (47 ) $ 605 $ 425 Plan Contributions During the Period $ — $ 349 $ 175 Estimated Future Contributions in the Current Fiscal Year $ — $ — $ — For the Nine Months Ended September 30, 2017: Service Cost 1 $ 1,050 $ 30 $ 110 Interest Cost 2 1,085 164 224 Expected Return on Plan Assets 2 (2,399 ) — — Amortization of Prior Service (Credit) Cost 2 (43 ) 43 (8 ) Amortization of Net Loss 2 443 94 — Net Periodic (Benefit) Cost $ 136 $ 331 $ 326 Plan Contributions During the Period $ — $ 345 $ 295 Footnotes: 1. Included in Salaries and Employee Benefits on the Consolidated Statements of Income 2. Included in Other Operating Expense on the Consolidated Statements of Income We are not required to make a contribution to the qualified pension plan in 2018 , and currently, we do not expect to make additional contributions in 2018 . Arrow makes contributions to its other post-retirement benefit plans in an amount equal to benefit payments for the year.

Earnings Per Common Share

Earnings Per Common Share	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Earnings Per Common Share	EARNINGS PER COMMON SHARE (In Thousands, Except Per Share Amounts) The following table presents a reconciliation of the numerator and denominator used in the calculation of basic and diluted earnings per common share (“EPS”) for periods ended September 30, 2018 and 2017 . All share and per share amounts have been adjusted for the September 27, 2018 3% stock dividend. Earnings Per Share Quarterly Period Ended: Year-to-Date Period Ended: September 30, 2018 September 30, 2017 September 30, 2018 September 30, 2017 Earnings Per Share - Basic: Net Income $ 9,260 $ 7,416 $ 27,521 $ 21,255 Weighted Average Shares - Basic 14,431 14,305 14,393 14,306 Earnings Per Share - Basic $ 0.64 $ 0.52 $ 1.91 $ 1.49 Earnings Per Share - Diluted: Net Income $ 9,260 $ 7,416 $ 27,521 $ 21,255 Weighted Average Shares - Basic 14,431 14,305 14,393 14,306 Dilutive Average Shares Attributable to Stock Options 89 80 86 95 Weighted Average Shares - Diluted 14,520 14,385 14,479 14,401 Earnings Per Share - Diluted $ 0.64 $ 0.52 $ 1.90 $ 1.48

Fair Value of Financial Instrum

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	FAIR VALUE OF FINANCIAL INSTRUMENTS (In Thousands) FASB ASC Subtopic 820-10 defines fair value, establishes a framework for measuring fair value in GAAP and requires certain disclosures about fair value measurements. We do not have any nonfinancial assets or liabilities measured at fair value on a recurring basis. The only assets or liabilities that Arrow measured at fair value on a recurring basis at September 30, 2018 were securities available-for-sale and equity securities and for December 31, 2017 and September 30, 2017 securities available-for-sale. Arrow held no securities or liabilities for trading on such dates. The table below presents the financial instrument's fair value and the amounts within the fair value hierarchy based on the lowest level of input that is significant to the fair value measurement: Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis Fair Value Measurements at Reporting Date Using: Fair Value Quoted Prices In Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Life-to-Date Gains (Losses) Fair Value of Assets and Liabilities Measured on a Recurring Basis: September 30, 2018 Securities Available-for Sale: U.S. Government & Agency Obligations $ 59,602 $ — $ 59,602 $ — State and Municipal Obligations 2,548 — 2,548 — Mortgage-Backed Securities 277,461 — 277,461 — Corporate and Other Debt Securities 800 — 800 — Total Securities Available-for-Sale 340,411 — 340,411 — Equity Securities 1,916 — 1,916 — Total Securities Measured on a Recurring Basis $ 342,327 $ — $ 342,327 $ — December 31, 2017 Securities Available-for Sale: U.S. Government & Agency Obligations $ 59,894 $ — $ 59,894 $ — State and Municipal Obligations 10,349 — 10,349 — Mortgage-Backed Securities 227,596 — 227,596 — Corporate and Other Debt Securities 800 — 800 — Equity Securities 1,561 — 1,561 — Total Securities Available-for Sale $ 300,200 $ — $ 300,200 $ — September 30, 2017 Securities Available-for Sale: U.S. Government & Agency Obligations $ 146,978 $ 64,730 $ 82,248 $ — State and Municipal Obligations 11,902 — 11,902 — Mortgage-Backed Securities 152,806 — 152,806 — Corporate and Other Debt Securities 2,299 — 2,299 — Equity Securities 1,474 — 1,474 — Total Securities Available-for Sale $ 315,459 $ 64,730 $ 250,729 $ — Fair Value of Assets and Liabilities Measured on a Nonrecurring Basis: September 30, 2018 Collateral Dependent Impaired Loans $ 857 $ — $ — $ 857 $ (58 ) Other Real Estate Owned and Repossessed Assets, Net 1,220 — — 1,220 (559 ) December 31, 2017 Collateral Dependent Impaired Loans $ — $ — $ — $ — $ — Other Real Estate Owned and Repossessed Assets, Net $ 1,847 $ — — 1,847 $ (569 ) September 30, 2017 Collateral Dependent Impaired Loans $ 1,502 $ — $ — $ 1,502 $ (138 ) Other Real Estate Owned and Repossessed Assets, Net 1,713 — — 1,713 (655 ) We determine the fair value of financial instruments under the following hierarchy: • Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities; • Level 2 - Quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, or inputs that are observable, either directly or indirectly, for substantially the full term of the asset or liability; • Level 3 - Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity). The Company determined that the previously reported U.S. Government & Agency Obligations of $59,894 were incorrectly classified as Level 1 securities, instead of the correct classification as Level 2 securities. The Company corrected the fair value leveling disclosure the year ended December 31, 2017 to reflect the correction of this classification. This error had no impact on the fair value of U.S. Government & Agency Obligations or the total securities available-for-sale. There were no transfers between Levels 1, 2 and 3 for the three months ended September 30, 2018 , December 31, 2017 and September 30, 2017 . Fair Value Methodology for Assets and Liabilities Measured on a Recurring Basis The fair value of Level 1 securities available-for-sale are based on unadjusted, quoted market prices from exchanges in active markets. The fair value of Level 2 securities available-for-sale are based on an independent bond and equity pricing service for identical assets or significantly similar securities and an independent equity pricing service for equity securities not actively traded. The pricing services use a variety of techniques to arrive at fair value including market maker bids, quotes and pricing models. Inputs to the pricing models include recent trades, benchmark interest rates, spreads and actual and projected cash flows. Fair Value Methodology for Assets and Liabilities Measured on a Nonrecurring Basis The fair value of collateral dependent impaired loans and other real estate owned was based on third-party appraisals less estimated cost to sell. The appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. Other assets which might have been included in this table include mortgage servicing rights, goodwill and other intangible assets. Arrow evaluates each of these assets for impairment on an annual basis, with no impairment recognized for these assets at September 30, 2018 , December 31, 2017 and September 30, 2017 . Fair Value Methodology for Financial Instruments Not Measured on a Recurring or Nonrecurring Basis The fair value for securities held-to-maturity is determined utilizing an independent bond pricing service for identical assets or significantly similar securities. The pricing service uses a variety of techniques to arrive at fair value including market maker bids, quotes and pricing models. Inputs to the pricing models include recent trades, benchmark interest rates, spreads and actual and projected cash flows. ASU 2016-01 "Recognition and Measurement of Financial Assets and Financial Liabilities" requires that, effective for the first quarter of 2018, the fair value for loans must be disclosed using the "exit price" notion which is a reasonable estimate of what another party might pay in an orderly transaction. Fair values for loans are calculated for portfolios of loans with similar financial characteristics. Loans are segregated by type such as commercial, commercial real estate, residential mortgage, indirect auto and other consumer loans. Each loan category is further segmented into fixed and adjustable interest rate terms and by performing and nonperforming categories. The fair value of performing loans is calculated by determining the estimated future cash flow, which is the contractual cash flow adjusted for estimated prepayments. The discount rate is determined by starting with current market yields, and first adjusting for a liquidity premium. This premium is separately determined for residential real estate loans vs. other loans. Then a credit loss component is determined utilizing the credit loss assumptions used in the allowance for loan and lease loss model. Finally, a discount spread is applied separately for consumer loans vs. commercial loans based on market information and utilization of the Swap Curve. Fair value for nonperforming loans is generally based on recent external appraisals. If appraisals are not available, estimated cash flows are discounted using a rate commensurate with the risk associated with the estimated cash flows. Assumptions regarding credit risk, cash flows and discount rates are judgmentally determined using available market information and specific borrower information. The fair value of time deposits is based on the discounted value of contractual cash flows, except that the fair value is limited to the extent that the customer could redeem the certificate after imposition of a premature withdrawal penalty. The discount rates are estimated using the Federal Home Loan Bank of New York ("FHLBNY") yield curve, which is considered representative of Arrow’s time deposit rates. The fair value of all other deposits is equal to the carrying value. The fair value of FHLBNY advances is estimated based on the discounted value of contractual cash flows. The discount rate is estimated using current rates on FHLBNY advances with similar maturities and call features. The book value of the outstanding trust preferred securities (Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts) are considered to approximate fair value since the interest rates are variable (indexed to LIBOR) and Arrow is well-capitalized. Fair Value by Balance Sheet Grouping The following table presents a summary of the carrying amount, the fair value or an amount approximating fair value and the fair value hierarchy of Arrow’s financial instruments: Schedule of Fair Values by Balance Sheet Grouping Fair Value Hierarchy Book Value Fair Value Level 1 Level 2 Level 3 September 30, 2018 Cash and Cash Equivalents $ 92,295 $ 92,295 $ 92,295 $ — $ — Securities Available-for-Sale 340,411 340,411 — 340,411 — Securities Held-to-Maturity 289,952 282,719 — 282,719 — Equity Securities 1,916 1,916 — 1,916 — Federal Home Loan Bank and Federal Reserve Bank Stock 10,866 10,866 — 10,866 — Net Loans 2,106,097 2,030,278 — — 2,030,278 Accrued Interest Receivable 8,028 8,028 — 8,028 — Deposits 2,407,855 2,398,987 — 2,398,987 — Federal Funds Purchased and Securities Sold Under Agreements to Repurchase 62,503 62,503 — 62,503 — Federal Home Loan Bank Overnight Advances 131,000 131,000 — 131,000 — Federal Home Loan Bank Term Advances 45,000 44,488 — 44,488 — Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts 20,000 20,000 — 20,000 — Accrued Interest Payable 485 485 — 485 — December 31, 2017 Cash and Cash Equivalents $ 72,838 $ 72,838 $ 72,838 $ — $ — Securities Available-for-Sale 300,200 300,200 — 300,200 — Securities Held-to-Maturity 335,907 335,901 — 335,901 — Federal Home Loan Bank and Federal Reserve Bank Stock 9,949 9,949 — 9,949 — Net Loans 1,932,184 1,901,046 — — 1,901,046 Accrued Interest Receivable 6,753 6,753 — 6,753 — Deposits 2,245,116 2,236,548 — 2,236,548 — Federal Funds Purchased and Securities Sold Under Agreements to Repurchase 64,966 64,966 — 64,966 — Federal Home Loan Bank Overnight Advances 105,000 105,000 — 105,000 — Federal Home Loan Bank Term Advances 55,000 54,781 — 54,781 — Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts 20,000 20,000 — 20,000 — Accrued Interest Payable 410 410 — 410 — September 30, 2017 Cash and Cash Equivalents $ 80,666 $ 80,666 $ 80,666 $ — $ — Securities Available-for-Sale 315,459 315,459 64,730 250,729 — Securities Held-to-Maturity 341,526 343,899 — 343,899 — Federal Home Loan Bank and Federal Reserve Bank Stock 6,704 6,704 — 6,704 — Net Loans 1,891,104 1,870,379 — — 1,870,379 Accrued Interest Receivable 6,563 7,692 — 7,692 — Deposits 2,307,116 2,299,011 — 2,299,011 — Federal Funds Purchased and Securities Sold Under Agreements to Repurchase 61,419 61,419 — 61,419 — Federal Home Loan Bank Overnight Advances 33,000 33,000 — 33,000 — Federal Home Loan Bank Term Advances 55,000 55,110 — 55,110 — Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts 20,000 20,000 — 20,000 — Accrued Interest Payable 260 260 — 260 —

Accounting Policies Significant

Accounting Policies Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Management's Use of Estimates	Management’s Use of Estimates -The preparation of the consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of income and expenses during the reporting period. Our most significant estimate is the allowance for loan losses. Other estimates include the evaluation of other-than-temporary impairment of investment securities, goodwill impairment, pension and other postretirement liabilities and an analysis of a need for a valuation allowance for deferred tax assets. Actual results could differ from those estimates. A material estimate that is particularly susceptible to significant change in the near term is the allowance for loan losses. In connection with the determination of the allowance for loan losses, management obtains appraisals for properties. The allowance for loan losses is management’s best estimate of probable loan losses incurred as of the balance sheet date. While management uses available information to recognize losses on loans, future adjustments to the allowance for loan losses may be necessary based on changes in economic conditions.
Recently Adopted and Recently Issued Accounting Standards	Recently Adopted and Recently Issued Accounting Standards The following accounting standards have been adopted in the first nine months of 2018: ASU 2014-09 "Revenue from Contracts With Customers" (Topic 606) was adopted as of January 1, 2018. For additional information, see Revenue Recognition under Significant Accounting Policy Update in this Note. ASU 2016-01 "Recognition and Measurement of Financial Assets and Financial Liabilities" (Subtopic 825-10) significantly changed the income statement impact of equity investments. For Arrow, the standard became effective for the first quarter of 2018, and requires that equity investments be measured at fair value, with changes in fair value recognized in net income. The cumulative effect of the January 1, 2018 adoption was an increase to retained earnings of $331 thousand with a corresponding decrease to Accumulated Other Comprehensive Loss. For periods prior to January 1, 2018, equity securities were classified as available-for-sale and stated at fair value with unrealized gains and losses reported as a separate component of accumulated other comprehensive income, net of tax. ASU 2016-01 also emphasized the existing requirement to use exit prices to measure fair value for disclosure purposes and clarifies that entities not make use of a practicability exception in determining the fair value of loans. Accordingly, the Company refined the calculation used to determine the disclosed fair value of its loans as part of adopting this standard. See Note 9 to the unaudited interim consolidated financial statements titled Fair Value of Financial Instruments. ASU 2016-15 "Statement of Cash Flows - Classification of Certain Cash Receipts and Cash Payments" (Topic 230) will reduce existing diversity in practice with respect to eight specific cash flow issues. Arrow adopted this ASU in the first quarter of 2018. ASU 2017-01 "Business Combinations" (Topic 805) defines when a set of assets and activities constitutes a business for the purposes of determining whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The amendments in this update allow for a business to consist of inputs, processes, and the ability to create output. For Arrow, the standard became effective in the first quarter of 2018. This update had no effect on its accounting for acquisitions and dispositions of businesses. ASU 2017-07 "Compensation-Retirement Benefits" (Topic 715) improves the presentation of net periodic pension cost and net periodic post-retirement benefit cost by requiring that an employer disaggregate the service cost component from the other components of net benefit cost. For Arrow, the standard became effective in the first quarter of 2018. In accordance with the practical expedient adoption method, for all periods presented Arrow used the amounts disclosed in the retirement plans footnote for the prior period retrospective reclassification of the non-service cost components from salaries and benefits to other operating expenses. The adoption of this change in accounting for pension costs did not have a material impact on its financial position or the results of operations. ASU 2017-09 "Compensation-Stock Compensation" (Topic 718) provides guidance about which changes to the terms and conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. The guidance highlights the requirements for applying modification accounting and the exception criteria relating to changes in share-based payment terms. For Arrow, the standard became effective in the first quarter of 2018. The adoption of this change in accounting for share-based payment awards did not have a material impact on its financial position or the results of operations in periods subsequent to its adoption. The following accounting standards have been issued and will become effective for the Company at a future date: In February 2016, the FASB issued ASU 2016-02, "Leases" (Topic 842) which requires lessees to recognize right-of-use assets and lease liabilities on the balance sheet for all leases with terms longer than 12 months. For a lease with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize a right-of-use asset and lease liability. Additionally, when measuring assets and liabilities arising from a lease, optional payments should be included only if the lessee is reasonably certain to exercise an option to extend the lease, exercise a purchase option or not exercise an option to terminate the lease. In January 2018, the FASB issued ASU 2018-01, Leases (Topic 842): "Land Easement Practical Expedient for Transition to Topic 842". In July 2018, the FASB issued ASU 2018-10 "Codification Improvements to Topic 842, Leases" which provided clarification on certain components of the original guidance, including that the rate implicit in the lease cannot be less than zero. Also in July 2018, the FASB issued ASU 2018-11 "Targeted Improvements" to Leases (Topic 842) which amends the original guidance to allow for the adoption of this standard to be applied retrospectively at the beginning of the period of adoption, which will be January 1, 2019 for Arrow, through a cumulative-effect adjustment to the balance sheet, including retained earnings, as of January 1, 2019. Practical expedients may be elected that would not require Arrow to reassess whether an existing contract contains a lease, to reassess existing leases between operating leases and finance leases and to not reassess initial direct costs for any existing leases. If elected, these practical expedients must be applied together. An entity may also elect a practical expedient, which must be applied consistently to all of its leases, to use hindsight in determining the lease term when considering lessee options to extend or terminate the lease and in assessing impairment in the right-of-use asset. In addition, a lessor may make an accounting policy election, by class of underlying asset, to not separate nonlease components from lease components and account for these components as a single lease component. Early adoption of this standard is permitted in any interim or annual period. The Company expects to adopt the new lease standard on January 1, 2019 through a cumulative-effect adjustment without revising prior comparative periods, and elect the practical expedients available to effectively account for leases commenced prior to the effective date. The Company expects assets and liabilities to increase between $7 million and $9 million at the January 1, 2019 adoption date, with no material impact to operating lease expense in its Consolidated Statements of Income. In June 2016, the FASB issued ASU 2016-13 "Financial Instruments - Credit Losses" (Topic 326) which will change the way financial entities measure expected credit losses for financial assets, primarily loans. Under this ASU, the "incurred loss" model will be replaced with an "expected loss" model which will recognize losses over the life of the instrument and requires consideration of a broader range of reasonable and supportable information. Currently, credit losses on available-for-sale securities reduce the carrying value of the instrument and cannot be reversed. Under this ASU, the amount of the credit loss is carried as a valuation allowance and can be reversed. The standard also requires expanded credit quality disclosures. For Arrow, the standard is effective for the first quarter of 2020 and early adoption is allowed in 2019. The Company plans on adopting the standard in the first quarter of 2020, in order to maximize the accumulation of data needed to calculate the new current expected credit loss ("CECL") methodologies. The ASU describes several acceptable methodologies for calculating expected losses on a loan or a pool of loans and requires additional disclosures. The initial adjustment will not be reported in earnings, but as the cumulative effect of a change in accounting principle. The FASB’s Transition Research Group for credit losses still has several outstanding unresolved questions, some of which may have a significant impact on CECL calculations. The Company continues its implementation efforts with the development and testing of various methods within its core model, developing forecast scenarios, monitoring of guidance interpretations and consideration of relevant internal controls and processes. This will likely have the effect of increasing the allowance for loan and lease losses and reducing shareholders' equity, the extent of which will depend upon the nature and characteristics of the Company's loan portfolio and economic conditions and forecasts at the adoption date. The Company expects to remain a well-capitalized financial institution under current regulatory calculations. In January 2017, the FASB issued ASU 2017-04 "Intangibles-Goodwill and Other" (Topic 350) which simplifies the procedures for evaluating impairment of goodwill. Prior to the adoption of this standard, entities were required to perform procedures to determine the fair value of the underlying assets and liabilities for determining the fair value of assets and liabilities in a business combination. This additional step to impairment testing has been eliminated. Under this ASU, entities will perform goodwill impairment testing by comparing the fair value of a reporting unit to its carrying value. For Arrow, the standard becomes effective in the first quarter of 2019, however, early adoption is permitted. This amendment will not affect the assessment of goodwill impairment since the Company currently performs the analysis of comparing carrying value to fair value of its reporting units that have goodwill and the Company has not had to perform a Step 2 Impairment Test to date. In March 2017, the FASB issued ASU 2017-08 "Receivables-Nonrefundable Fees and Other Costs" which amends the amortization period for certain purchased callable debt securities held at a premium. This shortens the amortization period for the premium to the earliest call date. Under GAAP, entities generally amortize the premium as an adjustment of yield over the contractual life of the instrument. For Arrow, the standard becomes effective in the first quarter of 2019. The Company does not expect that the adoption of this change in accounting for certain callable debt securities will have a material impact on its financial position or the results of operations in periods subsequent to its adoption. In August 2018, the FASB issued ASU 2018-13 "Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement" which as part of its disclosure framework, the FASB has eliminated, amended and added disclosure requirements for fair value measurements. The following disclosure requirements were eliminated: Amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy; the policy of the timing of transfers between levels of the fair value hierarchy; the valuation processes for Level 3 fair value measurements. For public companies such as Arrow, the following new disclosures will be required: Changes in unrealized gains and losses for the period included in other comprehensive income (OCI); the range and weighted average of significant unobservable inputs used; alternatively, a company may choose to disclose other quantitative information if it determines that it is a more reasonable and rational method that reflects the distribution of unobservable inputs used. For Arrow, the standard becomes effective in the first quarter of 2020. The Company does not expect that the adoption of this change in fair value disclosure will have a material impact on its financial position or the results of operations in periods subsequent to its adoption. In August 2018, the FASB issued ASU 2018-14 "Disclosure Framework-Changes to the Disclosure Requirements for Defined Benefit Plans" which applies to all companies that provide defined benefit pension or other postretirement benefit plans for their employees. Certain disclosure requirements have been eliminated such as reporting the amounts in accumulated other comprehensive income expected to be recognized as components of net periodic benefit cost over the next year, and reporting the effects of a one-percentage-point change in the assumed healthcare cost trend rate on the aggregate of the service cost and interest cost components of net periodic benefit cost and on the benefit obligation for postretirement healthcare benefits. New required disclosures for reporting the weighted-average interest rate used to credit cash balance and similar plans that have a promised interest credit, the reasons for significant gains and losses affecting benefit obligations and other requirements for reporting aggregate information related to pension plans. For Arrow, the standard becomes effective at December 31, 2020. The Company does not expect that the adoption of this change affecting defined benefit plan disclosures will have a material impact on its financial position or the results of operations. In August 2018, the FASB issued ASU 2018-15 "Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract" which will require companies to defer potentially significant, specified implementation costs incurred in a cloud computing arrangement that are often expensed under current US GAAP. For Arrow, the standard becomes effective at January 1, 2020. The Company is in the process of assessing the impact of this new accounting standard on its financial position and the results of operations in periods subsequent to its adoption. Significant Accounting Policy Update: Revenue Recognition - Accounting Standard Codification ("ASC") Topic 606, "Revenue from Contracts with Customers," establishes principles for reporting information about the nature, amount, timing and uncertainty of revenue and cash flows arising from the entity's contracts to provide goods or services to customers. The core principle of Topic 606 requires an entity to recognize revenue in a way that depicts the transfer of goods or services promised to a customer in an amount that reflects the consideration the entity expects to receive in exchange for those goods or services as performance obligations are satisfied. The Company adopted Topic 606 as of January 1, 2018 using the modified retrospective approach. The Company has determined that revenue from specific types of fiduciary activities and insurance commissions are within the scope of this guidance. Under prior GAAP, revenue from fiduciary activities was recognized from settling client estates over the time period the work was performed. With the adoption of Topic 606, revenue is now recognized when the performance obligation is completed, which is when the settlement of the client estate is closed. The impact of this change in revenue recognition was not material to the Company's consolidated financial statements. Under prior GAAP when clients elected to pay premiums on property and casualty insurance policies in installments, revenue was recognized when the premiums were billed. With the adoption of Topic 606, this type of revenue is recognized when the performance obligation is substantially completed, i.e., when the insurance policy is issued. The impact of this change in revenue recognition was not material to the Company's consolidated financial statements. The cumulative effect of the adoption of Topic 606 related to the previously described fiduciary activities and insurance commissions was a decrease in retained earnings by $102 thousand as of January 1, 2018. The majority of the Company's revenue-generating transactions are not subject to ASC Topic 606, including revenue generated from financial instruments, such as loans and investment securities which are presented in its consolidated income statements as components of net interest income. The following is a description of principal activities from which the Company generates its revenue from noninterest income sources that are within the scope of ASC Topic 606: Income from Fiduciary Activities: represents revenue derived mainly through the management of client investments which is based on the market value of the covered assets and the fee schedule contained in the applicable account management agreement. Since the revenue is mainly based on the market value of assets, this amount can be volatile as financial markets increase and decrease based on various economic factors. The terms of the account management agreements generally specify that the performance obligations are completed each quarter. Accordingly, the Company mainly recognizes revenue from fiduciary activities on a quarterly basis. Fees for Other Services to Customers: represents general service fees for monthly deposit account maintenance and account activity plus fees from other deposit-based services. Revenue is recognized when the performance obligation is completed, which is generally on a monthly basis for account maintenance services, or upon the completion of a deposit-related transaction. Payment for these performance obligations is generally received at the time the performance obligations are satisfied. Insurance Commissions: represents commissions and fees paid by insurance carriers for both property and casualty insurance policies, and for services performed for employment benefits clients. Revenue from the property and casualty insurance business is recognized when the performance obligation is satisfied, which is generally the effective date of the bound coverage since there are no significant performance obligations remaining. Revenue from the employment benefit brokerage business is recognized when the benefit servicing performance obligations are satisfied, generally on a monthly basis.

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Available-For-Sale Securities	The following table is the schedule of Available-For-Sale Securities at September 30, 2018 , December 31, 2017 and September 30, 2017 : Available-For-Sale Securities U.S. Government & Agency Obligations State and Municipal Obligations Mortgage- Backed Securities Corporate and Other Debt Securities Mutual Funds and Equity Securities Total Available- For-Sale Securities September 30, 2018 Available-For-Sale Securities, at Amortized Cost $ 60,135 $ 2,545 $ 284,236 $ 1,000 $ — $ 347,916 Available-For-Sale Securities, at Fair Value 59,602 2,548 277,461 800 — 340,411 Gross Unrealized Gains — 3 201 — — 204 Gross Unrealized Losses 533 — 6,976 200 — 7,709 Available-For-Sale Securities, Pledged as Collateral 219,587 Maturities of Debt Securities, at Amortized Cost: Within One Year $ 42,621 $ 1,346 $ 1,024 $ — $ 44,991 From 1 - 5 Years 17,514 719 164,808 — 183,041 From 5 - 10 Years — — 103,597 — 103,597 Over 10 Years — 480 14,807 1,000 16,287 Maturities of Debt Securities, at Fair Value: Within One Year $ 42,410 $ 1,346 $ 1,025 $ — $ 44,781 From 1 - 5 Years 17,192 722 158,846 — 176,760 From 5 - 10 Years — — 102,800 — 102,800 Over 10 Years — 480 14,790 800 16,070 Securities in a Continuous Loss Position, at Fair Value: Less than 12 Months $ 4,831 $ 1,120 $ 167,718 $ — $ — $ 173,669 12 Months or Longer 54,771 — 71,433 800 — 127,004 Total $ 59,602 $ 1,120 $ 239,151 $ 800 $ — $ 300,673 Number of Securities in a Continuous Loss Position 14 5 90 1 — 110 Unrealized Losses on Securities in a Continuous Loss Position: Less than 12 Months $ 193 $ — $ 3,165 $ — $ — $ 3,358 12 Months or Longer 340 — 3,811 200 — 4,351 Total $ 533 $ — $ 6,976 $ 200 $ — $ 7,709 Disaggregated Details: US Treasury Obligations, at Amortized Cost $ — US Treasury Obligations, — US Agency Obligations, 60,135 US Agency Obligations, 59,602 Available-For-Sale Securities U.S. Government & Agency Obligations State and Municipal Obligations Mortgage- Backed Securities Corporate and Other Debt Securities Mutual Funds and Equity Securities Total Available- For-Sale Securities US Government Agency Securities, at Amortized Cost $ 74,160 US Government Agency Securities, at Fair Value 74,098 Government Sponsored Entity Securities, at Amortized Cost 210,076 Government Sponsored Entity 203,363 December 31, 2017 Available-For-Sale Securities, at Amortized Cost $ 60,328 $ 10,351 $ 229,077 $ 1,000 $ 1,120 $ 301,876 Available-For-Sale Securities, at Fair Value 59,894 10,349 227,596 800 1,561 300,200 Gross Unrealized Gains — 9 485 — 441 935 Gross Unrealized Losses 434 11 1,966 200 — 2,611 Available-For-Sale Securities, Pledged as Collateral, at Fair Value 183,052 Securities in a Continuous Loss Position, at Fair Value: Less than 12 Months $ 20,348 $ 8,498 $ 70,930 $ — $ — $ 99,776 12 Months or Longer 39,546 — 80,759 800 — 121,105 Total $ 59,894 $ 8,498 $ 151,689 $ 800 $ — $ 220,881 Number of Securities in a Continuous Loss Position 14 36 55 1 — 106 Unrealized Losses on Securities in a Continuous Loss Position: Less than 12 Months $ 172 $ 11 $ 363 $ — $ — $ 546 12 Months or Longer 262 — 1,603 200 — 2,065 Total $ 434 $ 11 $ 1,966 $ 200 $ — $ 2,611 Disaggregated Details: US Treasury Obligations, at Amortized Cost $ — US Treasury Obligations, — US Agency Obligations, 60,328 US Agency Obligations, 59,894 US Government Agency Securities, at Amortized Cost $ 40,832 US Government Agency Securities, at Fair Value 40,832 Government Sponsored Entity Securities, at Amortized Cost 188,245 Government Sponsored Entity 186,764 Available-For-Sale Securities U.S. Government & Agency Obligations State and Municipal Obligations Mortgage- Backed Securities Corporate and Other Debt Securities Mutual Funds and Equity Securities Total Available- For-Sale Securities September 30, 2017 Available-For-Sale Securities, at Amortized Cost $ 146,976 $ 11,875 $ 152,858 $ 2,500 $ 1,120 $ 315,329 Available-For-Sale Securities, at Fair Value 146,978 11,902 152,806 2,299 1,474 315,459 Gross Unrealized Gains 152 27 964 — 354 1,497 Gross Unrealized Losses 150 — 1,016 201 — 1,367 Available-For-Sale Securities, Pledged as Collateral 206,637 Securities in a Continuous Loss Position, at Fair Value: Less than 12 Months $ 89,563 $ — $ 85,091 $ 500 $ — $ 175,154 12 Months or Longer — — — 1,800 — 1,800 Total $ 89,563 $ — $ 85,091 $ 2,300 $ — $ 176,954 Number of Securities in a Continuous Loss Position 23 — 31 3 — 57 Unrealized Losses on Securities in a Continuous Loss Position: Less than 12 Months $ 150 $ — $ 1,016 $ — $ — $ 1,166 12 Months or Longer — — — 201 — 201 Total $ 150 $ — $ 1,016 $ 201 $ — $ 1,367 Disaggregated Details: US Treasury Obligations, $ 64,711 US Treasury Obligations, $ 64,730 US Agency Obligations, $ 82,265 US Agency Obligations, 82,248 US Government Agency Securities, at Amortized Cost $ 503 US Government Agency Securities, at Fair Value 505 Government Sponsored Entity Securities, at Amortized Cost 152,355 Government Sponsored Entity 152,301
Held-To-Maturity Securities	The following table is the schedule of Held-To-Maturity Securities at September 30, 2018 , December 31, 2017 and September 30, 2017 : Held-To-Maturity Securities State and Municipal Obligations Mortgage- Backed Securities Corporate and Other Debt Securities Total Held-To Maturity Securities September 30, 2018 Held-To-Maturity Securities, at Amortized Cost $ 239,367 $ 50,585 $ — $ 289,952 Held-To-Maturity Securities, at Fair Value 233,557 49,162 — 282,719 Gross Unrealized Gains 261 — — 261 Gross Unrealized Losses 6,071 1,423 — 7,494 Held-To-Maturity Securities, Pledged as Collateral 268,229 Maturities of Debt Securities, at Amortized Cost: Within One Year $ 19,381 $ — $ — $ 19,381 From 1 - 5 Years 93,084 48,039 — 141,123 From 5 - 10 Years 124,277 2,546 — 126,823 Over 10 Years 2,625 — — 2,625 Maturities of Debt Securities, at Fair Value: Within One Year $ 19,396 $ — $ — $ 19,396 From 1 - 5 Years 92,199 46,688 — 138,887 From 5 - 10 Years 119,356 2,474 — 121,830 Over 10 Years 2,606 — — 2,606 Securities in a Continuous Loss Position, at Fair Value: Less than 12 Months $ 95,944 $ 46,375 $ — $ 142,319 12 Months or Longer 86,378 2,787 — 89,165 Total $ 182,322 $ 49,162 $ — $ 231,484 Number of Securities in a Continuous Loss Position 535 47 — 582 Unrealized Losses on Securities in a Continuous Loss Position: Less than 12 Months $ 1,443 $ 1,303 $ — $ 2,746 12 Months or Longer 4,628 120 — 4,748 Total $ 6,071 $ 1,423 $ — $ 7,494 Disaggregated Details: US Government Agency Securities, at Amortized Cost $ 3,147 US Government Agency Securities, at Fair Value 2,222 Government Sponsored Entity Securities, at Amortized Cost 47,438 Government Sponsored Entity 46,940 Held-To-Maturity Securities State and Municipal Obligations Mortgage- Backed Securities Corporate and Other Debt Securities Total Held-To Maturity Securities December 31, 2017 Held-To-Maturity Securities, at Amortized Cost $ 275,530 $ 60,377 $ — $ 335,907 Held-To-Maturity Securities, at Fair Value 275,353 60,548 — 335,901 Gross Unrealized Gains 1,691 269 — 1,960 Gross Unrealized Losses 1,868 98 — 1,966 Held-To-Maturity Securities, Pledged as Collateral 318,622 Securities in a Continuous Loss Position, at Fair Value: Less than 12 Months $ 55,648 $ 13,764 $ — $ 69,412 12 Months or Longer 65,152 3,257 — 68,409 Total $ 120,800 $ 17,021 $ — $ 137,821 Number of Securities in a Continuous Loss Position 352 14 — 366 Unrealized Losses on Securities in a Continuous Loss Position: Less than 12 Months $ 442 $ 56 $ — $ 498 12 Months or Longer 1,425 43 — 1,468 Total $ 1,867 $ 99 $ — $ 1,966 Disaggregated Details: US Government Agency Securities, at Amortized Cost $ 2,680 US Government Agency Securities, at Fair Value 2,661 Government Sponsored Entity Securities, at Amortized Cost 57,697 Government Sponsored Entity 57,887 September 30, 2017 Held-To-Maturity Securities, at Amortized Cost $ 277,738 $ 63,788 $ — $ 341,526 Held-To-Maturity Securities, at Fair Value 279,384 64,515 — 343,899 Gross Unrealized Gains 2,977 738 — 3,715 Gross Unrealized Losses 1,331 11 — 1,342 Held-To-Maturity Securities, Pledged as Collateral 325,096 Securities in a Continuous Loss Position, at Fair Value: Less than 12 Months $ 78,238 $ 3,544 $ — $ 81,782 12 Months or Longer 13,331 — — 13,331 Total $ 91,569 $ 3,544 $ — $ 95,113 Number of Securities in a Continuous Loss Position 252 7 — 259 Unrealized Losses on Securities in a Continuous Loss Position: Less than 12 Months $ 1,034 $ 11 $ — $ 1,045 12 Months or Longer 297 — — 297 Total $ 1,331 $ 11 $ — $ 1,342 Held-To-Maturity Securities State and Municipal Obligations Mortgage- Backed Securities Corporate and Other Debt Securities Total Held-To Maturity Securities September 30, 2017 Disaggregated Details: US Government Agency Securities, at Amortized Cost $ 2,792 US Government Agency Securities, at Fair Value 2,799 Government Sponsored Entity Securities, at Amortized Cost 60,996 Government Sponsored Entity 61,716
Debt Securities, Trading, and Equity Securities, FV-NI	The following table is the schedule of Equity Securities at September 30, 2018 . Upon the adoption of ASU 2016-01 effective January 1, 2018, Equity Securities are not included in Securities Available-For-Sale since unrealized gains and losses are now recorded in the Consolidated Statements of Income. Prior to January 1, 2018, Equity Securities were included in Securities Available-For-Sale. Equity Securities September 30, 2018 Equity Securities, at Fair Value $ 1,916
Unrealized Gain (Loss) on Investments	The following is a summary of realized and unrealized gains and losses recognized in net income on equity securities during the three- and nine-month periods ended September 30, 2018 : Three months ended September 30, 2018 Nine months ended September 30, 2018 Net Gain on Equity Securities $ 114 $ 355 Less: Net gain (loss) recognized during the reporting period on equity securities sold during the period — — Unrealized net gain recognized during the reporting period on equity securities still held at the reporting date $ 114 $ 355

Loans (Tables)

Loans (Tables)	9 Months Ended
	Sep. 30, 2018
Loans and Leases Receivable Disclosure [Abstract]
Past Due Financing Receivables	The following table presents loan balances outstanding as of September 30, 2018 , December 31, 2017 and September 30, 2017 and an analysis of the recorded investment in loans that are past due at these dates. Generally, Arrow considers an amortizing loan past due 30 or more days when the borrower is two payments past due. Loans held-for-sale of $201 , $327 and $1,323 as of September 30, 2018 , December 31, 2017 and September 30, 2017 , respectively, are included in the residential real estate balances for current loans. Commercial Commercial Real Estate Consumer Residential Total September 30, 2018 Loans Past Due 30-59 Days $ 198 $ — $ 5,651 $ 2,896 $ 8,745 Loans Past Due 60-89 Days — — 1,307 47 1,354 Loans Past Due 90 or more Days 76 807 494 1,523 2,900 Total Loans Past Due 274 807 7,452 4,466 12,999 Current Loans 126,838 469,315 686,736 830,212 2,113,101 Total Loans $ 127,112 $ 470,122 $ 694,188 $ 834,678 $ 2,126,100 Loans 90 or More Days Past Due and Still Accruing Interest $ — $ — $ 192 $ 980 $ 1,172 Nonaccrual Loans 674 807 540 2,447 4,468 December 31, 2017 Loans Past Due 30-59 Days $ 139 $ — $ 5,891 $ 2,094 $ 8,124 Loans Past Due 60-89 Days 19 — 1,215 509 1,743 Loans Past Due 90 or more Days 99 807 513 1,422 2,841 Total Loans Past Due 257 807 7,619 4,025 12,708 Current Loans 128,992 443,441 595,208 770,421 1,938,062 Total Loans $ 129,249 $ 444,248 $ 602,827 $ 774,446 $ 1,950,770 Loans 90 or More Days Past Due and Still Accruing Interest $ — $ — $ 6 $ 313 $ 319 Nonaccrual Loans $ 588 $ 1,530 $ 653 $ 2,755 5,526 September 30, 2017 Loans Past Due 30-59 Days $ 122 $ 442 $ 4,781 $ 1,675 $ 7,020 Loans Past Due 60-89 Days — — 914 77 991 Loans Past Due 90 or more Days 102 807 291 1,742 2,942 Total Loans Past Due 224 1,249 5,986 3,494 10,953 Current Loans 125,136 439,467 586,043 747,200 1,897,846 Total Loans $ 125,360 $ 440,716 $ 592,029 $ 750,694 $ 1,908,799 Loans 90 or More Days Past Due and Still Accruing Interest $ — $ — $ 41 $ 926 $ 967 Nonaccrual Loans $ 609 $ 1,249 $ 507 $ 3,117 5,482
Allowance for Credit Losses on Financing Receivables	The following table presents a roll-forward of the allowance for loan losses and other information pertaining to the allowance for loan losses: Allowance for Loan Losses Commercial Commercial Real Estate Consumer Residential Total Roll-forward of the Allowance for Loan Losses for the Quarterly Periods: June 30, 2018 $ 944 $ 5,838 $ 8,337 $ 4,521 $ 19,640 Charge-offs — — (300 ) (25 ) (325 ) Recoveries — — 102 — 102 Provision 99 81 551 (145 ) 586 September 30, 2018 $ 1,043 $ 5,919 $ 8,690 $ 4,351 $ 20,003 June 30, 2017 $ 925 $ 4,983 $ 7,305 $ 4,229 $ 17,442 Charge-offs — (342 ) (280 ) — (622 ) Recoveries 1 — 74 — 75 Provision (46 ) 446 509 (109 ) 800 September 30, 2017 $ 880 $ 5,087 $ 7,608 $ 4,120 $ 17,695 Allowance for Loan Losses Commercial Commercial Real Estate Consumer Residential Total Roll-forward of the Allowance for Loan Losses for the Year-to-Date Periods: December 31, 2017 $ 1,873 $ 4,504 $ 7,604 $ 4,605 $ 18,586 Charge-offs (16 ) — (895 ) (49 ) (960 ) Recoveries 1 12 403 — 416 Provision (815 ) 1,403 1,578 (205 ) 1,961 September 30, 2018 $ 1,043 $ 5,919 $ 8,690 $ 4,351 $ 20,003 December 31, 2016 $ 1,017 $ 5,677 $ 6,120 $ 4,198 $ 17,012 Charge-offs (2 ) (342 ) (847 ) (6 ) (1,197 ) Recoveries 8 — 292 — 300 Provision (143 ) (248 ) 2,043 (72 ) 1,580 September 30, 2017 $ 880 $ 5,087 $ 7,608 $ 4,120 $ 17,695 September 30, 2018 Allowance for loan losses - Loans Individually Evaluated for Impairment $ 84 $ 45 $ — $ 48 $ 177 Allowance for loan losses - Loans Collectively Evaluated for Impairment 959 5,874 8,690 4,303 19,826 Ending Loan Balance - Individually Evaluated for Impairment 489 812 109 2,013 3,423 Ending Loan Balance - Collectively Evaluated for Impairment $ 126,623 $ 469,310 $ 694,079 $ 832,665 $ 2,122,677 December 31, 2017 Allowance for loan losses - Loans Individually Evaluated for Impairment $ 94 $ 2 $ — $ 10 $ 106 Allowance for loan losses - Loans Collectively Evaluated for Impairment 1,779 4,502 7,604 4,595 18,480 Ending Loan Balance - Individually Evaluated for Impairment 489 1,537 95 1,562 3,683 Ending Loan Balance - Collectively Evaluated for Impairment $ 128,760 $ 442,711 $ 602,732 $ 772,884 $ 1,947,087 September 30, 2017 Allowance for loan losses - Loans Individually Evaluated for Impairment $ 104 $ — $ — $ 34 $ 138 Allowance for loan losses - Loans Collectively Evaluated for Impairment 776 5,087 7,608 4,086 17,557 Ending Loan Balance - Individually Evaluated for Impairment 489 1,543 104 1,139 3,275 Ending Loan Balance - Collectively Evaluated for Impairment $ 124,871 $ 439,172 $ 591,925 $ 749,556 $ 1,905,524
Financing Receivable Credit Quality Indicators	The following table presents the credit quality indicators by loan category at September 30, 2018 , December 31, 2017 and September 30, 2017 : Loan Credit Quality Indicators Commercial Commercial Real Estate Consumer Residential Total September 30, 2018 Credit Risk Profile by Creditworthiness Category: Satisfactory $ 119,217 $ 440,114 $ — $ — $ 559,331 Special Mention 5,949 — — — 5,949 Substandard 1,946 29,201 — — 31,147 Doubtful — 807 — — 807 Credit Risk Profile Based on Payment Activity: Performing $ — $ — $ 693,648 $ 832,231 $ 1,525,879 Nonperforming — — 540 2,447 2,987 December 31, 2017 Credit Risk Profile by Creditworthiness Category: Satisfactory $ 124,961 $ 417,362 $ — $ — $ 542,323 Special Mention 1,341 177 — — 1,518 Substandard 2,947 25,902 — — 28,849 Doubtful — 807 — — 807 Credit Risk Profile Based on Payment Activity: Performing $ — $ — $ 602,168 $ 771,584 $ 1,373,752 Nonperforming — — 659 3,068 3,727 September 30, 2017 Credit Risk Profile by Creditworthiness Category: Satisfactory $ 120,622 $ 411,685 $ — $ — $ 532,307 Special Mention 1,394 1,401 — — 2,795 Substandard 3,344 26,822 — — 30,166 Doubtful — 807 — — 807 Credit Risk Profile Based on Payment Activity: Performing $ — $ — $ 591,499 $ 746,652 $ 1,338,151 Nonperforming — — 530 4,043 4,573
Impaired Financing Receivables	The following table presents information on impaired loans based on whether the impaired loan has a recorded related allowance or has no recorded related allowance: Impaired Loans Commercial Commercial Real Estate Consumer Residential Total September 30, 2018 Recorded Investment: With No Related Allowance $ — $ 5 $ 108 $ 1,712 $ 1,825 With a Related Allowance 475 801 — 346 1,622 Unpaid Principal Balance: With No Related Allowance — 5 109 1,733 1,847 With a Related Allowance 489 807 — 280 1,576 December 31, 2017 Recorded Investment: With No Related Allowance $ — $ 781 $ 94 $ 1,269 $ 2,144 With a Related Allowance 485 725 — 333 1,543 Unpaid Principal Balance: With No Related Allowance — 816 95 1,274 2,185 With a Related Allowance 489 721 — 288 1,498 September 30, 2017 Recorded Investment: With No Related Allowance $ — $ 818 $ 104 $ 851 $ 1,773 With a Related Allowance 489 725 — 288 1,502 Unpaid Principal Balance: With No Related Allowance — 818 90 850 $ 1,758 With a Related Allowance 489 723 — 288 1,500 For the Quarter Ended: September 30, 2018 Average Recorded Balance: With No Related Allowance $ — $ 7 $ 104 $ 1,371 $ 1,482 With a Related Allowance 478 794 — 350 1,622 Interest Income Recognized: With No Related Allowance — — — — — With a Related Allowance — — — — — Cash Basis Income: With No Related Allowance — — — — — With a Related Allowance — — — — — September 30, 2017 Average Recorded Balance: With No Related Allowance $ — $ 998 $ 96 $ 827 $ 1,921 With a Related Allowance 496 363 — 288 1,147 Interest Income Recognized: With No Related Allowance — — 1 — 1 With a Related Allowance — — — — — Cash Basis Income: With No Related Allowance — — — — — With a Related Allowance — — — — — Impaired Loans Commercial Commercial Real Estate Consumer Residential Total For the Year-To-Date Period Ended: September 30, 2018 Average Recorded Balance: With No Related Allowance $ — $ 393 $ 101 $ 1,491 $ 1,985 With a Related Allowance 480 763 — 340 1,583 Interest Income Recognized: With No Related Allowance — — — — — With a Related Allowance — — — 20 20 Cash Basis Income: With No Related Allowance — — — — — With a Related Allowance — — — — — September 30, 2017 Average Recorded Balance: With No Related Allowance $ — $ 854 $ 98 $ 975 $ 1,927 With a Related Allowance 245 363 — 144 752 Interest Income Recognized: With No Related Allowance — — 3 — 3 With a Related Allowance — — — 4 4 Cash Basis Income: With No Related Allowance — — — — — With a Related Allowance — — — — —
Troubled Debt Restructurings on Financing Receivables	The following table presents information on loans modified in trouble debt restructurings during the periods indicated. Loans Modified in Trouble Debt Restructurings During the Period Commercial Commercial Real Estate Consumer Residential Total For the Quarter Ended: September 30, 2018 Number of Loans — — 1 — 1 Pre-Modification Outstanding Recorded Investment $ — $ — $ 16 $ — $ 16 Post-Modification Outstanding Recorded Investment — — 16 — 16 Subsequent Default, Number of Contracts — — — — — Subsequent Default, Recorded Investment — — — — — September 30, 2017 Number of Loans 1 — 2 — 3 Pre-Modification Outstanding Recorded Investment $ 725 $ — $ 25 $ — $ 750 Post-Modification Outstanding Recorded Investment 725 — 25 — 750 Subsequent Default, Number of Contracts — — — — — Subsequent Default, Recorded Investment — — — — — For the Year-To-Date Period Ended: September 30, 2018 Number of Loans — — 5 — 5 Pre-Modification Outstanding Recorded Investment $ — $ — $ 44 $ — $ 44 Post-Modification Outstanding Recorded Investment — — 44 — 44 Subsequent Default, Number of Contracts — — — — — Subsequent Default, Recorded Investment — — — — — September 30, 2017 Number of Loans 2 — 6 — 8 Pre-Modification Outstanding Recorded Investment $ 1,228 $ — $ 51 $ — $ 1,279 Post-Modification Outstanding Recorded Investment 1,228 — 51 — 1,279 Subsequent Default, Number of Contracts — — — — — Subsequent Default, Recorded Investment — — — — —

Guarantees (Tables)

Guarantees (Tables)	9 Months Ended
	Sep. 30, 2018
Guarantees [Abstract]
Schedule of Guarantor Obligations	The following table presents the notional amount and fair value of Arrow's off-balance sheet commitments to extend credit and commitments under standby letters of credit as of September 30, 2018 , December 31, 2017 and September 30, 2017 : Commitments to Extend Credit and Letters of Credit September 30, 2018 December 31, 2017 September 30, 2017 Notional Amount: Commitments to Extend Credit $ 335,587 $ 315,256 $ 316,449 Standby Letters of Credit 4,016 3,526 3,672 Fair Value: Commitments to Extend Credit $ — $ — $ — Standby Letters of Credit 4 23 18

Comprehensive Income (Tables)

Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2018
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Comprehensive Income	The following table presents the components of other comprehensive income for the three- and nine-month periods ended September 30, 2018 and 2017 : Schedule of Comprehensive Income Three Months Ended September 30, Nine Months Ended September 30, Tax Tax Before-Tax (Expense) Net-of-Tax Before-Tax (Expense) Net-of-Tax Amount Benefit Amount Amount Benefit Amount 2018 Net Unrealized Securities Holding Losses on Securities Available-for-Sale Arising During the Period (1,203 ) $ 306 (897 ) (5,388 ) $ 1,371 (4,017 ) Amortization of Net Retirement Plan Actuarial Loss 81 (21 ) 60 244 (63 ) 181 Accretion of Net Retirement Plan Prior Service Credit 27 (7 ) 20 81 (21 ) 60 Other Comprehensive Loss $ (1,095 ) $ 278 $ (817 ) $ (5,063 ) $ 1,287 $ (3,776 ) 2017 Net Unrealized Securities Holding Gains on Securities Available-for-Sale Arising During the Period 6 $ 3 9 749 $ (284 ) 465 Reclassification Adjustment for Securities Gains Included in Net Income (10 ) 4 (6 ) (10 ) 4 (6 ) Amortization of Net Retirement Plan Actuarial Loss 179 (115 ) 64 537 (292 ) 245 Accretion of Net Retirement Plan Prior Service Credit (3 ) 1 (2 ) (8 ) 3 (5 ) Other Comprehensive Income $ 172 $ (107 ) $ 65 $ 1,268 $ (569 ) $ 699
Changes in Accumulated Other Comprehensive Income By Component	The following table presents the changes in accumulated other comprehensive income by component: Changes in Accumulated Other Comprehensive Income (Loss) by Component (1) Unrealized Defined Benefit Plan Items Gains and Losses on Net Prior Available-for- Net Gain Service Sale Securities (Loss) (Cost ) Credit Total For the Quarter-To-Date periods ended: June 30, 2018 $ (4,701 ) $ (6,259 ) $ (844 ) $ (11,804 ) Other comprehensive income or loss before reclassifications (897 ) — — (897 ) Amounts reclassified from accumulated other comprehensive income 60 20 80 Net current-period other comprehensive income (loss) (897 ) 60 20 (817 ) September 30, 2018 $ (5,598 ) $ (6,199 ) $ (824 ) $ (12,621 ) June 30, 2017 $ 74 $ (5,556 ) $ (718 ) $ (6,200 ) Other comprehensive income or loss before reclassifications 9 — — 9 Amounts reclassified from accumulated other comprehensive income (6 ) 64 (2 ) 56 Net current-period other comprehensive income (loss) 3 64 (2 ) 65 September 30, 2017 $ 77 $ (5,492 ) $ (720 ) $ (6,135 ) For the Year-To-Date periods ended: December 31, 2017 $ (1,250 ) $ (6,380 ) $ (884 ) $ (8,514 ) Other comprehensive income or loss before reclassifications (4,017 ) — — (4,017 ) Amounts reclassified from accumulated other comprehensive income — 181 60 241 Net current-period other comprehensive income (4,017 ) 181 60 (3,776 ) Amounts reclassified from accumulated other comprehensive income $ (331 ) $ (331 ) September 30, 2018 $ (5,598 ) $ (6,199 ) $ (824 ) $ (12,621 ) December 31, 2016 $ (382 ) $ (5,737 ) $ (715 ) $ (6,834 ) Other comprehensive income or loss before reclassifications 465 — — 465 Amounts reclassified from accumulated other comprehensive income (6 ) 245 (5 ) 234 Net current-period other comprehensive income 459 245 (5 ) 699 September 30, 2017 $ 77 $ (5,492 ) $ (720 ) $ (6,135 ) (1) All amounts are net of tax.
Reclassification out of Accumulated Other Comprehensive Income	The following table presents the reclassifications out of accumulated other comprehensive income: Reclassifications Out of Accumulated Other Comprehensive Income Amounts Reclassified Details about Accumulated Other from Accumulated Other Affected Line Item in the Statement Comprehensive Income (Loss) Components Comprehensive Income Where Net Income Is Presented For the Quarter-to-date periods ended: September 30, 2018 Unrealized gains and losses on available-for-sale securities $ — Gain on Securities Transactions — Total before Tax — Provision for Income Taxes $ — Net of Tax Amortization of defined benefit pension items: Prior-service costs $ (27 ) (1) Salaries and Employee Benefits Actuarial gains/(losses) (81 ) (1) Salaries and Employee Benefits (108 ) Total before Tax 28 Provision for Income Taxes $ (80 ) Net of Tax Total reclassifications for the period $ (80 ) Net of Tax September 30, 2017 Unrealized gains and losses on available-for-sale securities $ 10 Gain on Securities Transactions 10 Total before Tax (4 ) Provision for Income Taxes $ 6 Net of Tax Amortization of defined benefit pension items: Prior-service costs $ 3 (1) Salaries and Employee Benefits Actuarial gains/(losses) (179 ) (1) Salaries and Employee Benefits (176 ) Total before Tax 114 Provision for Income Taxes $ (62 ) Net of Tax Total reclassifications for the period $ (56 ) Net of Tax For the Year-to-date periods ended: September 30, 2018 Unrealized gains and losses on available-for-sale securities $ — Gain on Securities Transactions — Total before Tax — Provision for Income Taxes $ — Net of Tax Amortization of defined benefit pension items: Prior-service costs $ (81 ) (1) Salaries and Employee Benefits Actuarial gains/(losses) (244 ) (1) Salaries and Employee Benefits (325 ) Total before Tax 84 Provision for Income Taxes $ (241 ) Net of Tax Total reclassifications for the period $ (241 ) Net of Tax Reclassifications Out of Accumulated Other Comprehensive Income Amounts Reclassified Details about Accumulated Other from Accumulated Other Affected Line Item in the Statement Comprehensive Income (Loss) Components Comprehensive Income Where Net Income Is Presented September 30, 2017 Unrealized gains and losses on available-for-sale securities $ 10 Gain on Securities Transactions 10 Total before Tax (4 ) Provision for Income Taxes $ 6 Net of Tax Amortization of defined benefit pension items: Prior-service costs 8 (1) Salaries and Employee Benefits Actuarial gains/(losses) $ (537 ) (1) Salaries and Employee Benefits (529 ) Total before Tax 289 Provision for Income Taxes $ (240 ) Net of Tax Total reclassifications for the period $ (234 ) Net of Tax (1) These accumulated other comprehensive income components are included in the computation of net periodic pension cost.

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award	The following table presents the roll forward of stock options issued pursuant to the Long Term Incentive Plan by Shares and Weighted Average Exercise Prices. Roll-Forward of Shares Outstanding: Outstanding at January 1, 2018 356,540 Granted 56,843 Exercised (94,742 ) Forfeited (14,953 ) Outstanding at September 30, 2018 303,688 Exercisable at Period-End 185,547 Vested and Expected to Vest 118,141 Roll-Forward of Shares Outstanding - Weighted Average Exercise Price: Outstanding at January 1, 2018 $ 23.42 Granted 29.95 Exercised 20.85 Forfeited 26.61 Outstanding at September 30, 2018 25.24 Exercisable at Period-End 22.47 Vested and Expected to Vest 29.59 Schedule of Other Long Term Incentive Plan Information Grants Issued During 2018 - Weighted Average Information: Fair Value $ 5.59 Fair Value Assumptions: Dividend Yield 2.98 % Expected Volatility 21.55 % Risk Free Interest Rate 2.68 % Expected Lives (in years) 6.98 The following table presents the roll forward of restricted stock units by units and weighted average grant-date fair value. Roll-Forward of Restricted Stock Units Non-vested at January 1, 2018 — Granted 3,377 Vested — Canceled — Non-vested at September 30, 2018 3,377 Roll-Forward of Non-vested Restricted Stock Units - Weighted Average Fair Value: Non-vested at January 1, 2018 $ — Granted 32.57 Vested — Canceled — Non-vested at September 30, 2018 32.57
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs	The following table presents information on the amounts expensed for the periods ended September 30, 2018 and 2017 : Share-Based Compensation Expense For the Three Months Ended September 30, For the Nine Months Ended September 30, 2018 2017 2018 2017 Share-Based Compensation Expense $ 89 $ 90 $ 267 $ 262

Retirement Plans (Tables)

Retirement Plans (Tables)	9 Months Ended
	Sep. 30, 2018
Defined Benefit Plan [Abstract]
Schedule of Defined Benefit Plans Disclosures	The following tables provide the components of net periodic benefit costs for the three - and nine-month periods ended September 30, 2018 and 2017 . Select Employees' Executive Postretirement Pension Retirement Benefit Plan Plan Plans Net Periodic Benefit Cost For the Three Months Ended September 30, 2018: Service Cost 1 $ 389 $ 104 $ 34 Interest Cost 2 400 48 81 Expected Return on Plan Assets 2 (841 ) — — Amortization of Prior Service (Credit) Cost 2 (12 ) 14 25 Amortization of Net Loss 2 48 33 — Net Periodic (Benefit) Cost $ (16 ) $ 199 $ 140 Plan Contributions During the Period $ — $ 116 $ 56 For the Three Months Ended September 30, 2017: Service Cost 1 $ 350 $ 10 $ 37 Interest Cost 2 362 55 75 Expected Return on Plan Assets 2 (800 ) — — Amortization of Prior Service (Credit) Cost 2 (14 ) 14 (3 ) Amortization of Net Loss 2 148 31 — Net Periodic (Benefit) Cost $ 46 $ 110 $ 109 Plan Contributions During the Period $ — $ 116 $ 65 Net Periodic Benefit Cost For the Nine Months Ended September 30, 2018: Service Cost 1 $ 1,168 $ 311 $ 102 Interest Cost 2 1,199 152 248 Expected Return on Plan Assets 2 (2,522 ) — — Amortization of Prior Service (Credit) Cost 2 (37 ) 43 75 Amortization of Net Loss 2 145 99 — Net Periodic (Benefit) Cost $ (47 ) $ 605 $ 425 Plan Contributions During the Period $ — $ 349 $ 175 Estimated Future Contributions in the Current Fiscal Year $ — $ — $ — For the Nine Months Ended September 30, 2017: Service Cost 1 $ 1,050 $ 30 $ 110 Interest Cost 2 1,085 164 224 Expected Return on Plan Assets 2 (2,399 ) — — Amortization of Prior Service (Credit) Cost 2 (43 ) 43 (8 ) Amortization of Net Loss 2 443 94 — Net Periodic (Benefit) Cost $ 136 $ 331 $ 326 Plan Contributions During the Period $ — $ 345 $ 295 Footnotes: 1. Included in Salaries and Employee Benefits on the Consolidated Statements of Income 2. Included in Other Operating Expense on the Consolidated Statements of Income

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table presents a reconciliation of the numerator and denominator used in the calculation of basic and diluted earnings per common share (“EPS”) for periods ended September 30, 2018 and 2017 . All share and per share amounts have been adjusted for the September 27, 2018 3% stock dividend. Earnings Per Share Quarterly Period Ended: Year-to-Date Period Ended: September 30, 2018 September 30, 2017 September 30, 2018 September 30, 2017 Earnings Per Share - Basic: Net Income $ 9,260 $ 7,416 $ 27,521 $ 21,255 Weighted Average Shares - Basic 14,431 14,305 14,393 14,306 Earnings Per Share - Basic $ 0.64 $ 0.52 $ 1.91 $ 1.49 Earnings Per Share - Diluted: Net Income $ 9,260 $ 7,416 $ 27,521 $ 21,255 Weighted Average Shares - Basic 14,431 14,305 14,393 14,306 Dilutive Average Shares Attributable to Stock Options 89 80 86 95 Weighted Average Shares - Diluted 14,520 14,385 14,479 14,401 Earnings Per Share - Diluted $ 0.64 $ 0.52 $ 1.90 $ 1.48

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements, Recurring and Nonrecurring	The table below presents the financial instrument's fair value and the amounts within the fair value hierarchy based on the lowest level of input that is significant to the fair value measurement: Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis Fair Value Measurements at Reporting Date Using: Fair Value Quoted Prices In Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Life-to-Date Gains (Losses) Fair Value of Assets and Liabilities Measured on a Recurring Basis: September 30, 2018 Securities Available-for Sale: U.S. Government & Agency Obligations $ 59,602 $ — $ 59,602 $ — State and Municipal Obligations 2,548 — 2,548 — Mortgage-Backed Securities 277,461 — 277,461 — Corporate and Other Debt Securities 800 — 800 — Total Securities Available-for-Sale 340,411 — 340,411 — Equity Securities 1,916 — 1,916 — Total Securities Measured on a Recurring Basis $ 342,327 $ — $ 342,327 $ — December 31, 2017 Securities Available-for Sale: U.S. Government & Agency Obligations $ 59,894 $ — $ 59,894 $ — State and Municipal Obligations 10,349 — 10,349 — Mortgage-Backed Securities 227,596 — 227,596 — Corporate and Other Debt Securities 800 — 800 — Equity Securities 1,561 — 1,561 — Total Securities Available-for Sale $ 300,200 $ — $ 300,200 $ — September 30, 2017 Securities Available-for Sale: U.S. Government & Agency Obligations $ 146,978 $ 64,730 $ 82,248 $ — State and Municipal Obligations 11,902 — 11,902 — Mortgage-Backed Securities 152,806 — 152,806 — Corporate and Other Debt Securities 2,299 — 2,299 — Equity Securities 1,474 — 1,474 — Total Securities Available-for Sale $ 315,459 $ 64,730 $ 250,729 $ — Fair Value of Assets and Liabilities Measured on a Nonrecurring Basis: September 30, 2018 Collateral Dependent Impaired Loans $ 857 $ — $ — $ 857 $ (58 ) Other Real Estate Owned and Repossessed Assets, Net 1,220 — — 1,220 (559 ) December 31, 2017 Collateral Dependent Impaired Loans $ — $ — $ — $ — $ — Other Real Estate Owned and Repossessed Assets, Net $ 1,847 $ — — 1,847 $ (569 ) September 30, 2017 Collateral Dependent Impaired Loans $ 1,502 $ — $ — $ 1,502 $ (138 ) Other Real Estate Owned and Repossessed Assets, Net 1,713 — — 1,713 (655 )
Fair Value, by Balance Sheet Grouping	The following table presents a summary of the carrying amount, the fair value or an amount approximating fair value and the fair value hierarchy of Arrow’s financial instruments: Schedule of Fair Values by Balance Sheet Grouping Fair Value Hierarchy Book Value Fair Value Level 1 Level 2 Level 3 September 30, 2018 Cash and Cash Equivalents $ 92,295 $ 92,295 $ 92,295 $ — $ — Securities Available-for-Sale 340,411 340,411 — 340,411 — Securities Held-to-Maturity 289,952 282,719 — 282,719 — Equity Securities 1,916 1,916 — 1,916 — Federal Home Loan Bank and Federal Reserve Bank Stock 10,866 10,866 — 10,866 — Net Loans 2,106,097 2,030,278 — — 2,030,278 Accrued Interest Receivable 8,028 8,028 — 8,028 — Deposits 2,407,855 2,398,987 — 2,398,987 — Federal Funds Purchased and Securities Sold Under Agreements to Repurchase 62,503 62,503 — 62,503 — Federal Home Loan Bank Overnight Advances 131,000 131,000 — 131,000 — Federal Home Loan Bank Term Advances 45,000 44,488 — 44,488 — Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts 20,000 20,000 — 20,000 — Accrued Interest Payable 485 485 — 485 — December 31, 2017 Cash and Cash Equivalents $ 72,838 $ 72,838 $ 72,838 $ — $ — Securities Available-for-Sale 300,200 300,200 — 300,200 — Securities Held-to-Maturity 335,907 335,901 — 335,901 — Federal Home Loan Bank and Federal Reserve Bank Stock 9,949 9,949 — 9,949 — Net Loans 1,932,184 1,901,046 — — 1,901,046 Accrued Interest Receivable 6,753 6,753 — 6,753 — Deposits 2,245,116 2,236,548 — 2,236,548 — Federal Funds Purchased and Securities Sold Under Agreements to Repurchase 64,966 64,966 — 64,966 — Federal Home Loan Bank Overnight Advances 105,000 105,000 — 105,000 — Federal Home Loan Bank Term Advances 55,000 54,781 — 54,781 — Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts 20,000 20,000 — 20,000 — Accrued Interest Payable 410 410 — 410 — September 30, 2017 Cash and Cash Equivalents $ 80,666 $ 80,666 $ 80,666 $ — $ — Securities Available-for-Sale 315,459 315,459 64,730 250,729 — Securities Held-to-Maturity 341,526 343,899 — 343,899 — Federal Home Loan Bank and Federal Reserve Bank Stock 6,704 6,704 — 6,704 — Net Loans 1,891,104 1,870,379 — — 1,870,379 Accrued Interest Receivable 6,563 7,692 — 7,692 — Deposits 2,307,116 2,299,011 — 2,299,011 — Federal Funds Purchased and Securities Sold Under Agreements to Repurchase 61,419 61,419 — 61,419 — Federal Home Loan Bank Overnight Advances 33,000 33,000 — 33,000 — Federal Home Loan Bank Term Advances 55,000 55,110 — 55,110 — Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts 20,000 20,000 — 20,000 — Accrued Interest Payable 260 260 — 260 —

Accounting Policies (Details)

Accounting Policies (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Accounting Standards Update 2016-01
Retained Earnings Adjustments [Line Items]
Impact of change in accounting policy		$ 0
Accounting Standards Update 2014-09
Retained Earnings Adjustments [Line Items]
Impact of change in accounting policy		(102)
Retained Earnings | Accounting Standards Update 2016-01
Retained Earnings Adjustments [Line Items]
Impact of change in accounting policy		331
Retained Earnings | Accounting Standards Update 2014-09
Retained Earnings Adjustments [Line Items]
Impact of change in accounting policy		$ (102)
Minimum | Accounting Standards Update 2016-02
Retained Earnings Adjustments [Line Items]
Impact of change in accounting policy	$ 7,000
Maximum | Accounting Standards Update 2016-02
Retained Earnings Adjustments [Line Items]
Impact of change in accounting policy	$ 9,000

Investment Securities Available

Investment Securities Available for Sale (Details) $ in Thousands	Sep. 30, 2018USD ($)	Dec. 31, 2017USD ($)	Sep. 30, 2017USD ($)
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	$ 347,916	$ 301,876	$ 315,329
Available-for-Sale	340,411	300,200	315,459
Gross Unrealized Gains	204	935	1,497
Gross Unrealized Losses	7,709	2,611	1,367
Maturities of Debt Securities, at Amortized Cost:
Within One Year	44,991
From 1 - 5 Years	183,041
From 5 - 10 Years	103,597
Over 10 Years	16,287
Maturities of Debt Securities, at Fair Value:
Within One Year	44,781
From 1 - 5 Years	176,760
From 5 - 10 Years	102,800
Over 10 Years	16,070
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	173,669	99,776	175,154
12 Months or Longer	127,004	121,105	1,800
Total	$ 300,673	$ 220,881	$ 176,954
Number of Securities in a Continuous Loss Position	110	106	57
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 3,358	$ 546	$ 1,166
12 Months or Longer	4,351	2,065	201
Total	7,709	2,611	1,367
U.S. Agency Obligations
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	60,135	60,328	146,976
Available-for-Sale	59,602	59,894	146,978
Gross Unrealized Gains	0	0	152
Gross Unrealized Losses	533	434	150
Maturities of Debt Securities, at Amortized Cost:
Within One Year	42,621
From 1 - 5 Years	17,514
From 5 - 10 Years	0
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	42,410
From 1 - 5 Years	17,192
From 5 - 10 Years	0
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	4,831	20,348	89,563
12 Months or Longer	54,771	39,546	0
Total	$ 59,602	$ 59,894	$ 89,563
Number of Securities in a Continuous Loss Position	14	14	23
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 193	$ 172	$ 150
12 Months or Longer	340	262	0
Total	533	434	150
State and Municipal Obligations
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	2,545	10,351	11,875
Available-for-Sale	2,548	10,349	11,902
Gross Unrealized Gains	3	9	27
Gross Unrealized Losses	0	11	0
Maturities of Debt Securities, at Amortized Cost:
Within One Year	1,346
From 1 - 5 Years	719
From 5 - 10 Years	0
Over 10 Years	480
Maturities of Debt Securities, at Fair Value:
Within One Year	1,346
From 1 - 5 Years	722
From 5 - 10 Years	0
Over 10 Years	480
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	1,120	8,498	0
12 Months or Longer	0	0	0
Total	$ 1,120	$ 8,498	$ 0
Number of Securities in a Continuous Loss Position	5	36	0
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0	$ 11	$ 0
12 Months or Longer	0	0	0
Total	0	11	0
Mortgage-Backed Securities - Residential
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	284,236	229,077	152,858
Available-for-Sale	277,461	227,596	152,806
Gross Unrealized Gains	201	485	964
Gross Unrealized Losses	6,976	1,966	1,016
Maturities of Debt Securities, at Amortized Cost:
Within One Year	1,024
From 1 - 5 Years	164,808
From 5 - 10 Years	103,597
Over 10 Years	14,807
Maturities of Debt Securities, at Fair Value:
Within One Year	1,025
From 1 - 5 Years	158,846
From 5 - 10 Years	102,800
Over 10 Years	14,790
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	167,718	70,930	85,091
12 Months or Longer	71,433	80,759	0
Total	$ 239,151	$ 151,689	$ 85,091
Number of Securities in a Continuous Loss Position	90	55	31
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 3,165	$ 363	$ 1,016
12 Months or Longer	3,811	1,603	0
Total	6,976	1,966	1,016
Corporate and Other Debt Securities
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	1,000	1,000	2,500
Available-for-Sale	800	800	2,299
Gross Unrealized Gains	0	0	0
Gross Unrealized Losses	200	200	201
Maturities of Debt Securities, at Amortized Cost:
Within One Year	0
From 1 - 5 Years	0
From 5 - 10 Years	0
Over 10 Years	1,000
Maturities of Debt Securities, at Fair Value:
Within One Year	0
From 1 - 5 Years	0
From 5 - 10 Years	0
Over 10 Years	800
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	0	0	500
12 Months or Longer	800	800	1,800
Total	$ 800	$ 800	$ 2,300
Number of Securities in a Continuous Loss Position	1	1	3
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0	$ 0	$ 0
12 Months or Longer	200	200	201
Total	200	200	201
Mutual Funds and Equity Securities
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	0	1,120	1,120
Available-for-Sale	0	1,561	1,474
Gross Unrealized Gains	0	441	354
Gross Unrealized Losses	0	0	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	0	0	0
12 Months or Longer	0	0	0
Total	$ 0	$ 0	$ 0
Number of Securities in a Continuous Loss Position	0	0	0
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0	$ 0	$ 0
12 Months or Longer	0	0	0
Total	0	0	0
Collateral Pledged
Available-For-Sale Securities
Available-For-Sale Securities, Pledged as Collateral	219,587	183,052	206,637
US Treasury Securities | U.S. Agency Obligations
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	0	0	64,711
Available-for-Sale	0	0	64,730
Agency Securities | U.S. Agency Obligations
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	60,135	60,328	82,265
Available-for-Sale	59,602	59,894	82,248
US Government Agencies Debt Securities | Mortgage-Backed Securities - Residential
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	74,160	40,832	503
Available-for-Sale	74,098	40,832	505
US Government-sponsored Enterprises Debt Securities | Mortgage-Backed Securities - Residential
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	210,076	188,245	152,355
Available-for-Sale	$ 203,363	$ 186,764	$ 152,301

Investment Securities Held to M

Investment Securities Held to Maturity (Details) $ in Thousands	Sep. 30, 2018USD ($)	Dec. 31, 2017USD ($)	Sep. 30, 2017USD ($)
Schedule of Held-to-maturity Securities [Line Items]
Equity Securities	$ 1,916	$ 0	$ 0
Held-To-Maturity Securities, at Amortized Cost	289,952	335,907	341,526
Held-To-Maturity Securities, at Fair Value	282,719	335,901	343,899
Gross Unrealized Gains	261	1,960	3,715
Gross Unrealized Losses	7,494	1,966	1,342
Maturities of Debt Securities, at Amortized Cost:
Within One Year	19,381
From 1 - 5 Years	141,123
From 5 - 10 Years	126,823
Over 10 Years	2,625
Maturities of Debt Securities, at Fair Value:
Within One Year	19,396
From 1 - 5 Years	138,887
From 5 - 10 Years	121,830
Over 10 Years	2,606
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	142,319	69,412	81,782
12 Months or Longer	89,165	68,409	13,331
Total	$ 231,484	$ 137,821	$ 95,113
Number of Securities in a Continuous Loss Position	582	366	259
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 2,746	$ 498	$ 1,045
12 Months or Longer	4,748	1,468	297
Total	7,494	1,966	1,342
State and Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	239,367	275,530	277,738
Held-To-Maturity Securities, at Fair Value	233,557	275,353	279,384
Gross Unrealized Gains	261	1,691	2,977
Gross Unrealized Losses	6,071	1,868	1,331
Maturities of Debt Securities, at Amortized Cost:
Within One Year	19,381
From 1 - 5 Years	93,084
From 5 - 10 Years	124,277
Over 10 Years	2,625
Maturities of Debt Securities, at Fair Value:
Within One Year	19,396
From 1 - 5 Years	92,199
From 5 - 10 Years	119,356
Over 10 Years	2,606
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	95,944	55,648	78,238
12 Months or Longer	86,378	65,152	13,331
Total	$ 182,322	$ 120,800	$ 91,569
Number of Securities in a Continuous Loss Position	535	352	252
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 1,443	$ 442	$ 1,034
12 Months or Longer	4,628	1,425	297
Total	6,071	1,867	1,331
Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	50,585	60,377	63,788
Held-To-Maturity Securities, at Fair Value	49,162	60,548	64,515
Gross Unrealized Gains	0	269	738
Gross Unrealized Losses	1,423	98	11
Maturities of Debt Securities, at Amortized Cost:
Within One Year	0
From 1 - 5 Years	48,039
From 5 - 10 Years	2,546
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	0
From 1 - 5 Years	46,688
From 5 - 10 Years	2,474
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	46,375	13,764	3,544
12 Months or Longer	2,787	3,257	0
Total	$ 49,162	$ 17,021	$ 3,544
Number of Securities in a Continuous Loss Position	47	14	7
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 1,303	$ 56	$ 11
12 Months or Longer	120	43	0
Total	1,423	99	11
Corporate and Other Debt Securities
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	0	0	0
Held-To-Maturity Securities, at Fair Value	0	0	0
Gross Unrealized Gains	0	0	0
Gross Unrealized Losses	0	0	0
Maturities of Debt Securities, at Amortized Cost:
Within One Year	0
From 1 - 5 Years	0
From 5 - 10 Years	0
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	0
From 1 - 5 Years	0
From 5 - 10 Years	0
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	0	0	0
12 Months or Longer	0	0	0
Total	$ 0	$ 0	$ 0
Number of Securities in a Continuous Loss Position	0	0	0
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0	$ 0	$ 0
12 Months or Longer	0	0	0
Total	0	0	0
US Government Agencies Debt Securities | Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	3,147	2,680	2,792
US Government-sponsored Enterprises Debt Securities | Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	47,438	57,697	60,996
Collateral Pledged
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, Pledged as Collateral	268,229	318,622	325,096
Fair Value, Measurements, Recurring
Schedule of Held-to-maturity Securities [Line Items]
Equity Securities	1,916
Fair Value, Measurements, Recurring | US Government Agencies Debt Securities | Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Fair Value	2,222	2,661	2,799
Fair Value, Measurements, Recurring | US Government-sponsored Enterprises Debt Securities | Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Fair Value	$ 46,940	$ 57,887	$ 61,716

Investment Securities Unrealize

Investment Securities Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Net Gain on Securities	$ 114	$ 10	$ 355	$ 10
Less: Net gain (loss) recognized during the reporting period on equity securities sold during the period	0		0
Unrealized net gain recognized during the reporting period on equity securities still held at the reporting date	$ 114		$ 355

Loans Supplemental Loan Informa

Loans Supplemental Loan Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Loans and Leases Receivable Disclosure [Abstract]
Loans Held-for-sale	$ 201	$ 327	$ 1,323
Credit Card Receivable | Consumer Portfolio Segment | Minimum
Schedule of Financing Receivable Terms [Line Items]
Principal Repayment Terms, Period	1 year
Credit Card Receivable | Consumer Portfolio Segment | Maximum
Schedule of Financing Receivable Terms [Line Items]
Principal Repayment Terms, Period	5 years
Automobile Loan | Consumer Portfolio Segment | Minimum
Schedule of Financing Receivable Terms [Line Items]
Principal Repayment Terms, Period	3 years
Automobile Loan | Consumer Portfolio Segment | Maximum
Schedule of Financing Receivable Terms [Line Items]
Principal Repayment Terms, Period	7 years

Loans Loan Categories and Past

Loans Loan Categories and Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	$ 12,999	$ 12,708	$ 10,953
Current Loans	2,113,101	1,938,062	1,897,846
Total Loans	2,126,100	1,950,770	1,908,799
Loans 90 or More Days Past Due and Still Accruing Interest	1,172	319	967
Nonaccrual Loans	4,468	5,526	5,482
Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	8,745	8,124	7,020
Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	1,354	1,743	991
Financing Receivables, Equal to Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	2,900	2,841	2,942
Commercial
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	274	257	224
Current Loans	126,838	128,992	125,136
Total Loans	127,112	129,249	125,360
Loans 90 or More Days Past Due and Still Accruing Interest	0	0	0
Nonaccrual Loans	674	588	609
Commercial | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	198	139	122
Commercial | Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	0	19	0
Commercial | Financing Receivables, Equal to Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	76	99	102
Commercial Real Estate Portfolio Segment
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	807	807	1,249
Current Loans	469,315	443,441	439,467
Total Loans	470,122	444,248	440,716
Loans 90 or More Days Past Due and Still Accruing Interest	0	0	0
Nonaccrual Loans	807	1,530	1,249
Commercial Real Estate Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	0	0	442
Commercial Real Estate Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	0	0	0
Commercial Real Estate Portfolio Segment | Financing Receivables, Equal to Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	807	807	807
Consumer Loans Financing
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	7,452	7,619	5,986
Current Loans	686,736	595,208	586,043
Total Loans	694,188	602,827	592,029
Loans 90 or More Days Past Due and Still Accruing Interest	192	6	41
Nonaccrual Loans	540	653	507
Consumer Loans Financing | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	5,651	5,891	4,781
Consumer Loans Financing | Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	1,307	1,215	914
Consumer Loans Financing | Financing Receivables, Equal to Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	494	513	291
Residential
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	4,466	4,025	3,494
Current Loans	830,212	770,421	747,200
Total Loans	834,678	774,446	750,694
Loans 90 or More Days Past Due and Still Accruing Interest	980	313	926
Nonaccrual Loans	2,447	2,755	3,117
Residential | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	2,896	2,094	1,675
Residential | Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	47	509	77
Residential | Financing Receivables, Equal to Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	$ 1,523	$ 1,422	$ 1,742

Loans Allowance for Loan Losses

Loans Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	$ 19,640	$ 17,442	$ 18,586	$ 17,012
Charge-offs	(325)	(622)	(960)	(1,197)
Recoveries	102	75	416	300
Provision	586	800	1,961	1,580
Allowance for Loan Losses, Ending Balance	20,003	17,695	20,003	17,695
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	177	138	177	138	$ 106
Allowance for loan losses - Loans Collectively Evaluated for Impairment	19,826	17,557	19,826	17,557	18,480
Ending Loan Balance - Individually Evaluated for Impairment	3,423	3,275	3,423	3,275	3,683
Ending Loan Balance - Collectively Evaluated for Impairment	2,122,677	1,905,524	2,122,677	1,905,524	1,947,087
Commercial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	944	925	1,873	1,017
Charge-offs	0	0	(16)	(2)
Recoveries	0	1	1	8
Provision	99	(46)	(815)	(143)
Allowance for Loan Losses, Ending Balance	1,043	880	1,043	880
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	84	104	84	104	94
Allowance for loan losses - Loans Collectively Evaluated for Impairment	959	776	959	776	1,779
Ending Loan Balance - Individually Evaluated for Impairment	489	489	489	489	489
Ending Loan Balance - Collectively Evaluated for Impairment	126,623	124,871	126,623	124,871	128,760
Commercial Real Estate Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	5,838	4,983	4,504	5,677
Charge-offs	0	(342)	0	(342)
Recoveries	0	0	12	0
Provision	81	446	1,403	(248)
Allowance for Loan Losses, Ending Balance	5,919	5,087	5,919	5,087
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	45	0	45	0	2
Allowance for loan losses - Loans Collectively Evaluated for Impairment	5,874	5,087	5,874	5,087	4,502
Ending Loan Balance - Individually Evaluated for Impairment	812	1,543	812	1,543	1,537
Ending Loan Balance - Collectively Evaluated for Impairment	469,310	439,172	469,310	439,172	442,711
Consumer Loans Financing
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	8,337	7,305	7,604	6,120
Charge-offs	(300)	(280)	(895)	(847)
Recoveries	102	74	403	292
Provision	551	509	1,578	2,043
Allowance for Loan Losses, Ending Balance	8,690	7,608	8,690	7,608
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	0	0	0	0	0
Allowance for loan losses - Loans Collectively Evaluated for Impairment	8,690	7,608	8,690	7,608	7,604
Ending Loan Balance - Individually Evaluated for Impairment	109	104	109	104	95
Ending Loan Balance - Collectively Evaluated for Impairment	694,079	591,925	694,079	591,925	602,732
Residential
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	4,521	4,229	4,605	4,198
Charge-offs	(25)	0	(49)	(6)
Recoveries	0	0	0	0
Provision	(145)	(109)	(205)	(72)
Allowance for Loan Losses, Ending Balance	4,351	4,120	4,351	4,120
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	48	34	48	34	10
Allowance for loan losses - Loans Collectively Evaluated for Impairment	4,303	4,086	4,303	4,086	4,595
Ending Loan Balance - Individually Evaluated for Impairment	2,013	1,139	2,013	1,139	1,562
Ending Loan Balance - Collectively Evaluated for Impairment	$ 832,665	$ 749,556	$ 832,665	$ 749,556	$ 772,884

Loans Credit Quality Indicators

Loans Credit Quality Indicators (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 559,331	$ 542,323	$ 532,307
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	5,949	1,518	2,795
Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	31,147	28,849	30,166
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	807	807	807
Performing
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,525,879	1,373,752	1,338,151
Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	2,987	3,727	4,573
Commercial | Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	119,217	124,961	120,622
Commercial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	5,949	1,341	1,394
Commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,946	2,947	3,344
Commercial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Commercial Real Estate Portfolio Segment | Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	440,114	417,362	411,685
Commercial Real Estate Portfolio Segment | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	177	1,401
Commercial Real Estate Portfolio Segment | Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	29,201	25,902	26,822
Commercial Real Estate Portfolio Segment | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	807	807	807
Consumer Loans Financing | Performing
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	693,648	602,168	591,499
Consumer Loans Financing | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	540	659	530
Residential | Performing
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	832,231	771,584	746,652
Residential | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 2,447	$ 3,068	$ 4,043

Loans Impaired Loans (Details)

Loans Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Recorded Investment:
With No Related Allowance	$ 1,825	$ 1,773	$ 1,825	$ 1,773	$ 2,144
With a Related Allowance	1,622	1,502	1,622	1,502	1,543
Unpaid Principal Balance:
With No Related Allowance	1,847	1,758	1,847	1,758	2,185
With a Related Allowance	1,576	1,500	1,576	1,500	1,498
Average Recorded Balance:
With No Related Allowance	1,482	1,921	1,985	1,927
With a Related Allowance	1,622	1,147	1,583	752
Interest Income Recognized:
With No Related Allowance	0	1	0	3
With a Related Allowance	0	0	20	4
Cash Basis Income:
With No Related Allowance	0	0	0	0
With a Related Allowance	0	0	0	0
Commercial
Recorded Investment:
With No Related Allowance	0	0	0	0	0
With a Related Allowance	475	489	475	489	485
Unpaid Principal Balance:
With No Related Allowance	0	0	0	0	0
With a Related Allowance	489	489	489	489	489
Average Recorded Balance:
With No Related Allowance	0	0	0	0
With a Related Allowance	478	496	480	245
Interest Income Recognized:
With No Related Allowance	0	0	0	0
With a Related Allowance	0	0	0	0
Cash Basis Income:
With No Related Allowance	0	0	0	0
With a Related Allowance	0	0	0	0
Commercial Real Estate Portfolio Segment
Recorded Investment:
With No Related Allowance	5	818	5	818	781
With a Related Allowance	801	725	801	725	725
Unpaid Principal Balance:
With No Related Allowance	5	818	5	818	816
With a Related Allowance	807	723	807	723	721
Average Recorded Balance:
With No Related Allowance	7	998	393	854
With a Related Allowance	794	363	763	363
Interest Income Recognized:
With No Related Allowance	0	0	0	0
With a Related Allowance	0	0	0	0
Cash Basis Income:
With No Related Allowance	0	0	0	0
With a Related Allowance	0	0	0	0
Consumer Portfolio Segment
Recorded Investment:
With No Related Allowance	108	104	108	104	94
With a Related Allowance	0	0	0	0	0
Unpaid Principal Balance:
With No Related Allowance	109	90	109	90	95
With a Related Allowance	0	0	0	0	0
Average Recorded Balance:
With No Related Allowance	104	96	101	98
With a Related Allowance	0	0	0	0
Interest Income Recognized:
With No Related Allowance	0	1	0	3
With a Related Allowance	0	0	0	0
Cash Basis Income:
With No Related Allowance	0	0	0	0
With a Related Allowance	0	0	0	0
Residential
Recorded Investment:
With No Related Allowance	1,712	851	1,712	851	1,269
With a Related Allowance	346	288	346	288	333
Unpaid Principal Balance:
With No Related Allowance	1,733	850	1,733	850	1,274
With a Related Allowance	280	288	280	288	$ 288
Average Recorded Balance:
With No Related Allowance	1,371	827	1,491	975
With a Related Allowance	350	288	340	144
Interest Income Recognized:
With No Related Allowance	0	0	0	0
With a Related Allowance	0	0	20	4
Cash Basis Income:
With No Related Allowance	0	0	0	0
With a Related Allowance	$ 0	$ 0	$ 0	$ 0

Loans Loans Modified in Trouble

Loans Loans Modified in Trouble Debt Restructurings (Details) - Entity Loan Modification Program - Payment Deferral $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018USD ($)contract	Sep. 30, 2017USD ($)contract	Sep. 30, 2018USD ($)contract	Sep. 30, 2017USD ($)contract
Financing Receivable, Modifications [Line Items]
Number of Loans | contract	1	3	5	8
Pre-Modification Outstanding Recorded Investment	$ 16	$ 750	$ 44	$ 1,279
Post-Modification Outstanding Recorded Investment	$ 16	$ 750	$ 44	$ 1,279
Subsequent Default, Number of Contracts | contract	0	0	0	0
Subsequent Default, Recorded Investment	$ 0	$ 0	$ 0	$ 0
Commercial
Financing Receivable, Modifications [Line Items]
Number of Loans | contract	0	1	0	2
Pre-Modification Outstanding Recorded Investment	$ 0	$ 725	$ 0	$ 1,228
Post-Modification Outstanding Recorded Investment	$ 0	$ 725	$ 0	$ 1,228
Subsequent Default, Number of Contracts | contract	0	0	0	0
Subsequent Default, Recorded Investment	$ 0	$ 0	$ 0	$ 0
Commercial Real Estate Portfolio Segment
Financing Receivable, Modifications [Line Items]
Number of Loans | contract	0	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Subsequent Default, Number of Contracts | contract	0	0	0	0
Subsequent Default, Recorded Investment	$ 0	$ 0	$ 0	$ 0
Consumer Loans Financing
Financing Receivable, Modifications [Line Items]
Number of Loans | contract	1	2	5	6
Pre-Modification Outstanding Recorded Investment	$ 16	$ 25	$ 44	$ 51
Post-Modification Outstanding Recorded Investment	$ 16	$ 25	$ 44	$ 51
Subsequent Default, Number of Contracts | contract	0	0	0	0
Subsequent Default, Recorded Investment	$ 0	$ 0	$ 0	$ 0
Residential
Financing Receivable, Modifications [Line Items]
Number of Loans | contract	0	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Subsequent Default, Number of Contracts | contract	0	0	0	0
Subsequent Default, Recorded Investment	$ 0	$ 0	$ 0	$ 0

Guarantees (Details)

Guarantees (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Commitments to Extend Credit
Loan Commitments and Letters of Credit [Line Items]
Notional Amount	$ 335,587	$ 315,256	$ 316,449
Fair Value	0	0	0
Standby Letters of Credit
Loan Commitments and Letters of Credit [Line Items]
Notional Amount	4,016	3,526	3,672
Fair Value	$ 4	$ 23	$ 18
Minimum | Standby Letters of Credit
Loan Commitments and Letters of Credit [Line Items]
Loan commitments, fixed fee percent	1.00%
Maximum | Standby Letters of Credit
Loan Commitments and Letters of Credit [Line Items]
Loan commitments, fixed fee percent	3.00%

Comprehensive Income Other Comp

Comprehensive Income Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017		Sep. 30, 2018		Sep. 30, 2017
Schedule of Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax		$ 0	$ 6		$ 0		$ 6	[1]
Other Comprehensive Income, before Tax		(1,095)	172		(5,063)		1,268
Other Comprehensive Income, Tax		278	(107)		1,287		(569)
Net current-period other comprehensive income (loss)		(817)	65		(3,776)		699
Unrealized Gains and Losses on Available for Sale Securities
Schedule of Comprehensive Income [Line Items]
Net Unrealized Securities Holding Losses on Securities Available-for-Sale Arising During the Period Before Tax		(1,203)	6		(5,388)		749
Net Unrealized Securities Holding Losses on Securities Available-for-Sale Arising During the Period, Tax		306	3		1,371		(284)
Other comprehensive income or loss before reclassifications		(897)	9	[1]	(4,017)	[1]	465	[1]
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax			10				10
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit			(4)				(4)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax			(6)				(6)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[1]		(6)		0		(6)
Net current-period other comprehensive income (loss)	[1]	(897)	3		(4,017)		459
Amortization of Net Retirement Plan Actuarial Gain (Loss)
Schedule of Comprehensive Income [Line Items]
Other comprehensive income or loss before reclassifications	[1]	0	0		0		0
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax		81	179		244		537
Reclassification from Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit		(21)	(115)		(63)		(292)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[1]	60	64		181		245
Net current-period other comprehensive income (loss)	[1]	60	64		181		245
Accumulated Defined Benefit Plans Adjustment, Net Prior Service
Schedule of Comprehensive Income [Line Items]
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax		27	(3)		81		(8)
Reclassification from Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit		(7)	1		(21)		3
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		$ 20	$ (2)		$ 60		$ (5)
[1]	All amounts are net of tax.

Comprehensive Income Changes in

Comprehensive Income Changes in Accumulated Other Comprehensive Income By Component (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017		Sep. 30, 2018		Sep. 30, 2017		Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net current-period other comprehensive income (loss)		$ (817)	$ 65		$ (3,776)		$ 699
Unrealized Gains and Losses on Available for Sale Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' Equity, Period Start	[1]	(4,701)	74		(1,250)		(382)
Other comprehensive income or loss before reclassifications		(897)	9	[1]	(4,017)	[1]	465	[1]
Amounts reclassified from accumulated other comprehensive income	[1]		(6)		0		(6)
Net current-period other comprehensive income (loss)	[1]	(897)	3		(4,017)		459
Amounts reclassified from accumulated other comprehensive income	[1]								$ (331)
Stockholders' Equity, Period End	[1]	(5,598)	77		(5,598)		77
Amortization of Net Retirement Plan Actuarial Gain (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' Equity, Period Start	[1]	(6,259)	(5,556)		(6,380)		(5,737)
Other comprehensive income or loss before reclassifications	[1]	0	0		0		0
Amounts reclassified from accumulated other comprehensive income	[1]	60	64		181		245
Net current-period other comprehensive income (loss)	[1]	60	64		181		245
Stockholders' Equity, Period End	[1]	(6,199)	(5,492)		(6,199)		(5,492)
Accretion of Net Retirement Plan Prior Service (Cost) Credit
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' Equity, Period Start	[1]	(844)	(718)		(884)		(715)
Other comprehensive income or loss before reclassifications	[1]	0	0		0		0
Amounts reclassified from accumulated other comprehensive income	[1]	20	(2)		60		(5)
Net current-period other comprehensive income (loss)	[1]	20	(2)		60		(5)
Stockholders' Equity, Period End	[1]	(824)	(720)		(824)		(720)
Accumulated Other Comprehensive Loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' Equity, Period Start	[1]	(11,804)	(6,200)		(8,514)		(6,834)
Other comprehensive income or loss before reclassifications	[1]	(897)	9		(4,017)		465
Amounts reclassified from accumulated other comprehensive income	[1]	80	56		241		234
Net current-period other comprehensive income (loss)	[1]	(817)	65		(3,776)		699
Amounts reclassified from accumulated other comprehensive income	[1]								$ (331)
Stockholders' Equity, Period End	[1]	$ (12,621)	$ (6,135)		$ (12,621)		$ (6,135)
[1]	All amounts are net of tax.

Comprehensive Income Reclassifi

Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Provision for Income Taxes	$ 2,475	$ 3,027	$ 6,855	$ 8,735
Net Income	(80)	(56)	(241)	(234)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains and Losses on Available for Sale Securities
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other Nonoperating Income (Expense)	0	10	0	10
Total before tax	0	10	0	10
Provision for Income Taxes	0	(4)	0	(4)
Net Income	0	6	0	6
Reclassification out of Accumulated Other Comprehensive Income | Accretion of Net Retirement Plan Prior Service (Cost) Credit
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other Nonoperating Income (Expense)	(27)	3	(81)	8
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss)
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other Nonoperating Income (Expense)	(81)	(179)	(244)	(537)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(108)	(176)	(325)	(529)
Provision for Income Taxes	28	114	84	289
Net Income	$ (80)	$ (62)	$ (241)	$ (240)

Stock-Based Compensation (Detai

Stock-Based Compensation (Details)	9 Months Ended
	Sep. 30, 2018plan$ / sharesshares	Sep. 27, 2018	Sep. 28, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of plans | plan	3
Stock dividend, percent		3.00%	3.00%
Roll-Forward of Shares Outstanding - Weighted Average Exercise Price:
Fair Value, in dollars per share	$ 5.59
Dividend Yield	2.98%
Expected Volatility	21.55%
Risk Free Interest Rate	2.68%
Expected Lives, in years	6 years 11 months 23 days
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration period (in years)	10 years
Award vesting period (in years)	4 years
Roll-Forward of Shares Outstanding:
Outstanding, Beginning of Period, in shares | shares	356,540
Granted, in shares | shares	56,843
Exercised, in shares | shares	(94,742)
Forfeited, in shares | shares	(14,953)
Outstanding, End of Period, in shares | shares	303,688
Exercisable at Period End, in shares | shares	185,547
Vested and Expected to Vest, in shares | shares	118,141
Roll-Forward of Shares Outstanding - Weighted Average Exercise Price:
Outstanding at Beginning of Period, in dollars per share	$ 23.42
Granted, in dollars per share	29.95
Exercised, in dollars per share	20.85
Forfeited, in dollars per share	26.61
Outstanding, End of Period, in dollars per share	25.24
Exercisable at Period End, in dollars per share	22.47
Vested and Expected to Vest, in dollars per share	$ 29.59
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	3 years

Stock-Based Compensation - Rest

Stock-Based Compensation - Restricted Stock Units (Details) - Restricted Stock Units (RSU)	9 Months Ended
	Sep. 30, 2018$ / sharesshares
Roll-Forward of Restricted Stock Units
Balance at Beginning of Period, in units | shares	0
Granted, in units | shares	3,377
Vested, in units | shares	0
Canceled, in units | shares	0
Balance at End of Period, in units | shares	3,377
Roll-Forward of Non-vested Restricted Stock Units - Weighted Average Fair Value:
Outstanding at Beginning of period, in dollars per unit | $ / shares	$ 0
Granted, in dollars per unit | $ / shares	32.57
Vested, in dollars per unit | $ / shares	0
Canceled, in dollars per unit | $ / shares	0
Outstanding at End of period, in dollars per unit | $ / shares	$ 32.57

Stock-Based Compensation Expens

Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation Expense	$ 89	$ 90	$ 267	$ 262
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Discount from market price, percent			5.00%

Retirement Plans (Details)

Retirement Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net Periodic Benefit Cost [Line Items]
Employer matching contribution, Percentage			5.00%
Employees' Pension Plan
Net Periodic Benefit Cost [Line Items]
Service Cost	$ 389	$ 350	$ 1,168	$ 1,050
Interest Cost	400	362	1,199	1,085
Expected Return on Plan Assets	(841)	(800)	(2,522)	(2,399)
Amortization of Prior Service (Credit) Cost	(12)	(14)	(37)	(43)
Amortization of Net Loss	48	148	145	443
Net Periodic (Benefit) Cost	(16)	46	(47)	136
Plan Contributions During the Period	0	0	0	0
Estimated Future Contributions in the Current Fiscal Year	0		0
Select Executive Retirement Plan
Net Periodic Benefit Cost [Line Items]
Service Cost	104	10	311	30
Interest Cost	48	55	152	164
Expected Return on Plan Assets	0	0	0	0
Amortization of Prior Service (Credit) Cost	14	14	43	43
Amortization of Net Loss	33	31	99	94
Net Periodic (Benefit) Cost	199	110	605	331
Plan Contributions During the Period	116	116	349	345
Estimated Future Contributions in the Current Fiscal Year	0		0
Post-Retirement Benefit Plans
Net Periodic Benefit Cost [Line Items]
Service Cost	34	37	102	110
Interest Cost	81	75	248	224
Expected Return on Plan Assets	0	0	0	0
Amortization of Prior Service (Credit) Cost	25	(3)	75	(8)
Amortization of Net Loss	0	0	0	0
Net Periodic (Benefit) Cost	140	109	425	326
Plan Contributions During the Period	56	$ 65	175	$ 295
Estimated Future Contributions in the Current Fiscal Year	$ 0		$ 0
On Or Subsequent to January 1, 2003
Net Periodic Benefit Cost [Line Items]
Service credits, percent of eligible salaries			6.00%
Minimum | Prior to January 1, 2003
Net Periodic Benefit Cost [Line Items]
Service credits, percent of eligible salaries			6.00%
Maximum | Prior to January 1, 2003
Net Periodic Benefit Cost [Line Items]
Service credits, percent of eligible salaries			12.00%

Earnings Per Common Share (Deta

Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended				9 Months Ended
		Sep. 30, 2018		Sep. 30, 2017		Sep. 30, 2018		Sep. 30, 2017		Sep. 27, 2018	Sep. 28, 2017
Earnings Per Share [Abstract]
Stock dividend, percent										3.00%	3.00%
Net Income		$ 9,260		$ 7,416		$ 27,521		$ 21,255
Weighted Average Shares- Basic, in shares		14,431	[1]	14,305	[2]	14,393	[1]	14,306	[2]
Earnings Per Share- Basic, in dollars per share		$ 0.64	[1]	$ 0.52	[1]	$ 1.91	[1]	$ 1.49	[2]
Dilutive Average Shares Attributable to Stock Options		89		80		86		95
Weighted Average Shares- Diluted, in shares	[2]	14,520		14,385		14,479		14,401
Earnings Per Share- Diluted, in dollars per share		$ 0.64	[1]	$ 0.52	[1]	$ 1.90	[1]	$ 1.48	[2]
[1]	Cash dividends paid per share have been adjusted for the September 27, 2018 3% stock dividend.
[2]	Share and Per Share Amounts have been restated for the September 27, 2018 3% stock dividend.

Fair Value of Financial Instr_3

Fair Value of Financial Instruments Fair Value - Recurring and Nonrecurring (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale	$ 340,411	$ 300,200	$ 315,459
Equity Securities	1,916	0	0
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale	340,411
Equity Securities	1,916
Total Securities Measured on a Recurring Basis	342,327
Securities Available-for-Sale		300,200	315,459
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Indentical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale	0
Equity Securities	0
Total Securities Measured on a Recurring Basis	0
Securities Available-for-Sale		0	64,730
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale	340,411
Equity Securities	1,916
Total Securities Measured on a Recurring Basis	342,327
Securities Available-for-Sale		300,200	250,729
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale	0
Equity Securities	0
Total Securities Measured on a Recurring Basis	0
Securities Available-for-Sale		0	0
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans		0
Gain (Loss) on Collateral Dependent Impaired Loans		0
Other Real Estate and Repossessed Assets, Net	1,220	1,847	1,713
Gain (Loss) Other Real Estate and Repossessed Assets, Net	(559)	(569)	(655)
Fair Value, Measurements, Nonrecurring | Quoted Prices In Active Markets for Indentical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans		0
Other Real Estate and Repossessed Assets, Net	0	0	0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans		0
Other Real Estate and Repossessed Assets, Net	0	0	0
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans		0
Other Real Estate and Repossessed Assets, Net	1,220	1,847	1,713
U.S. Agency Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale	59,602	59,894	146,978
U.S. Agency Obligations | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale	59,602
Securities Available-for-Sale		59,894	146,978
U.S. Agency Obligations | Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Indentical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale	0
Securities Available-for-Sale		0	64,730
U.S. Agency Obligations | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale	59,602
Securities Available-for-Sale		59,894	82,248
U.S. Agency Obligations | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale	0
Securities Available-for-Sale		0	0
State and Municipal Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale	2,548	10,349	11,902
State and Municipal Obligations | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale	2,548
Securities Available-for-Sale		10,349	11,902
State and Municipal Obligations | Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Indentical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale	0
Securities Available-for-Sale		0	0
State and Municipal Obligations | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale	2,548
Securities Available-for-Sale		10,349	11,902
State and Municipal Obligations | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale	0
Securities Available-for-Sale		0	0
Mortgage-Backed Securities - Residential | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale	277,461
Securities Available-for-Sale		227,596	152,806
Mortgage-Backed Securities - Residential | Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Indentical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale	0
Securities Available-for-Sale		0	0
Mortgage-Backed Securities - Residential | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale	277,461
Securities Available-for-Sale		227,596	152,806
Mortgage-Backed Securities - Residential | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale	0
Securities Available-for-Sale		0	0
Corporate and Other Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale	800	800	2,299
Corporate and Other Debt Securities | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale	800
Securities Available-for-Sale		800	2,299
Corporate and Other Debt Securities | Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Indentical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale	0
Securities Available-for-Sale		0	0
Corporate and Other Debt Securities | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale	800
Securities Available-for-Sale		800	2,299
Corporate and Other Debt Securities | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale	0
Securities Available-for-Sale		0	0
Mutual Funds and Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale	0	1,561	1,474
Mutual Funds and Equity Securities | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities			1,474
Securities Available-for-Sale		1,561
Mutual Funds and Equity Securities | Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Indentical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities			0
Securities Available-for-Sale		0
Mutual Funds and Equity Securities | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities			1,474
Securities Available-for-Sale		1,561
Mutual Funds and Equity Securities | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities			0
Securities Available-for-Sale		$ 0
Collateral Pledged | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	857		1,502
Gain (Loss) on Collateral Dependent Impaired Loans	(58)		(138)
Collateral Pledged | Fair Value, Measurements, Nonrecurring | Quoted Prices In Active Markets for Indentical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	0		0
Collateral Pledged | Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	0		0
Collateral Pledged | Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans	$ 857		$ 1,502

Fair Value of Financial Instr_4

Fair Value of Financial Instruments Fair Value by Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	$ 92,295	$ 72,838	$ 80,666	$ 57,355
Available-for-Sale	340,411	300,200	315,459
Held-To-Maturity Securities, at Amortized Cost	289,952	335,907	341,526
Held-To-Maturity Securities, at Fair Value	282,719	335,901	343,899
Equity Securities	1,916	0	0
Net Loans	2,106,097	1,932,184	1,891,104
Deposits	2,407,855	2,245,116	2,307,116
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase		64,966	61,419
Federal Home Loan Bank Overnight Advances		105,000	33,000
Federal Home Loan Bank Term Advances		55,000	55,000
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts		20,000	20,000
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	92,295		80,666
Available-for-Sale	340,411
Securities Available-for-Sale		300,200	315,459
Held-To-Maturity Securities, at Amortized Cost	289,952	335,907	341,526
Equity Securities	1,916
Federal Home Loan Bank and Federal Reserve Bank Stock	10,866	9,949	6,704
Net Loans	2,106,097	1,932,184	1,891,104
Accrued Interest Receivable	8,028	6,753	6,563
Deposits	2,407,855	2,245,116	2,307,116
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	62,503	64,966	61,419
Federal Home Loan Bank Overnight Advances	131,000	105,000	33,000
Federal Home Loan Bank Term Advances	45,000	55,000	55,000
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	20,000
Accrued Interest Payable	485	410	260
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	92,295	72,838	80,666
Available-for-Sale	340,411
Securities Available-for-Sale		300,200	315,459
Held-To-Maturity Securities, at Fair Value	282,719	335,901	343,899
Equity Securities	1,916
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value	10,866	9,949	6,704
Net Loans, at Fair Value	2,030,278	1,901,046	1,870,379
Accrued Interest Receivable, Fair Value Disclosure	8,028	6,753	7,692
Deposits, at Fair Value	2,398,987	2,236,548	2,299,011
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, at Fair Value	62,503	64,966	61,419
Federal Home Loan Bank Overnight Advances, Fair Value Disclosure	131,000	105,000	33,000
Federal Home Loan Bank Term Advances, Fair Value Disclosure	44,488	54,781	55,110
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	20,000	20,000	20,000
Accrued Interest Payable, Fair Value Disclosure	485	410	260
Quoted Prices In Active Markets for Indentical Assets (Level 1) | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	92,295	72,838	80,666
Available-for-Sale	0
Securities Available-for-Sale		0	64,730
Held-To-Maturity Securities, at Fair Value	0	0	0
Equity Securities	0
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value	0	0	0
Net Loans, at Fair Value	0	0	0
Accrued Interest Receivable, Fair Value Disclosure	0	0	0
Deposits, at Fair Value	0	0	0
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, at Fair Value	0	0	0
Federal Home Loan Bank Overnight Advances, Fair Value Disclosure	0	0	0
Federal Home Loan Bank Term Advances, Fair Value Disclosure	0	0	0
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	0	0	0
Accrued Interest Payable, Fair Value Disclosure	0	0	0
Significant Other Observable Inputs (Level 2) | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0	0	0
Available-for-Sale	340,411
Securities Available-for-Sale		300,200	250,729
Held-To-Maturity Securities, at Fair Value	282,719	335,901	343,899
Equity Securities	1,916
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value	10,866	9,949	6,704
Net Loans, at Fair Value	0	0	0
Accrued Interest Receivable, Fair Value Disclosure	8,028	6,753	7,692
Deposits, at Fair Value	2,398,987	2,236,548	2,299,011
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, at Fair Value	62,503	64,966	61,419
Federal Home Loan Bank Overnight Advances, Fair Value Disclosure	131,000	105,000	33,000
Federal Home Loan Bank Term Advances, Fair Value Disclosure	44,488	54,781	55,110
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	20,000	20,000	20,000
Accrued Interest Payable, Fair Value Disclosure	485	410	260
Significant Unobservable Inputs (Level 3) | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0	0	0
Available-for-Sale	0
Securities Available-for-Sale		0	0
Held-To-Maturity Securities, at Fair Value	0	0	0
Equity Securities	0
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value	0	0	0
Net Loans, at Fair Value	2,030,278	1,901,046	1,870,379
Accrued Interest Receivable, Fair Value Disclosure	0	0	0
Deposits, at Fair Value	0	0	0
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, at Fair Value	0	0	0
Federal Home Loan Bank Overnight Advances, Fair Value Disclosure	0	0	0
Federal Home Loan Bank Term Advances, Fair Value Disclosure	0	0	0
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	0	0	0
Accrued Interest Payable, Fair Value Disclosure	$ 0	$ 0	$ 0