Arrow Financial (AROW) 10-Q 6 May 21 2021 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2021	Apr. 30, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	0-12507
Entity Registrant Name	ARROW FINANCIAL CORPORATION
Entity Incorporation, State or Country Code	NY
Entity Tax Identification Number	22-2448962
Entity Address, Address Line One	250 Glen Street
Entity Address, City or Town	Glens Falls
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	12801
City Area Code	518
Local Phone Number	745-1000
Title of 12(b) Security	Common Stock, Par Value $1.00 per share
Trading Symbol	AROW
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		15,553,329
Entity Central Index Key	0000717538
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Amendment Flag	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
ASSETS
Cash and Due From Banks	$ 45,602	$ 42,116	$ 32,525
Interest-Bearing Deposits at Banks	406,605	338,875	106,004
Investments, Debt and Equity Securities [Abstract]
Available-for-Sale at Fair Value	464,089	365,287	378,186
Held-to-Maturity (Approximate Fair Value of $221,360 at March 31, 2021; $226,576 at December 31, 2020; and $242,804 at March 31, 2020)	214,561	218,405	238,520
Equity Securities	1,796	1,636	1,689
FHLB and Federal Reserve Bank Stock	5,360	5,349	5,379
Total	2,639,243	2,595,030	2,414,193
Allowance for Credit Losses	(26,840)	(29,232)	(23,637)
Net Loans	2,612,403	2,565,798	2,390,556
Premises and Equipment, Net	43,057	42,612	40,987
Goodwill	21,873	21,873	21,873
Other Intangible Assets, Net	2,049	1,950	1,640
Other Assets	86,316	84,735	73,973
Total Assets	3,903,711	3,688,636	3,291,332
LIABILITIES
Noninterest-Bearing Deposits	751,884	701,341	489,151
Interest-Bearing Checking Accounts	992,486	832,434	793,425
Savings Deposits	1,463,229	1,423,358	1,146,683
Time Deposits over $250,000	100,212	123,622	135,854
Other Time Deposits	145,777	153,971	245,892
Total Deposits	3,453,588	3,234,726	2,811,005
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	6,795	17,486	57,909
Federal Home Loan Bank Term Advances	45,000	45,000	50,000
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	20,000
Finance Leases	5,205	5,217	5,249
Other Liabilities	30,710	31,815	37,771
Total Liabilities	3,561,298	3,354,244	2,981,934
STOCKHOLDERS’ EQUITY
Preferred Stock, $1 Par Value and 1,000,000 Shares Authorized at March 31, 2021, December 31, 2020 and March 31, 2020	0	0	0
Common Stock, $1 Par Value; 30,000,000 Shares Authorized (20,194,474 Shares Issued at March 31, 2021 and December 31, 2020 and 19,606,449 at March 31, 2020)	20,194	20,194	19,606
Additional Paid-in Capital	354,358	353,662	336,021
Retained Earnings	51,263	41,899	37,441
Accumulated Other Comprehensive Loss	(3,096)	(816)	(2,412)
Treasury Stock, at Cost (4,651,719 Shares at March 31, 2021; 4,678,736 Shares at December 31, 2020 and 4,624,348 Shares at March 31, 2020)	(80,306)	(80,547)	(81,258)
Total Stockholders’ Equity	342,413	334,392	309,398
Total Liabilities and Stockholders’ Equity	$ 3,903,711	$ 3,688,636	$ 3,291,332

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Statement of Financial Position [Abstract]
Held-to-maturity securities, at fair value	$ 221,360	$ 226,576	$ 242,804
Preferred Stock, par value (in dollars per share)	$ 1	$ 1	$ 1
Preferred Stock, shares authorized (in shares)	1,000,000	1,000,000	1,000,000
Common Stock, par value (in dollars per share)	$ 1	$ 1	$ 1
Common Stock, shares authorized (in shares)	30,000,000	30,000,000	30,000,000
Common Stock, shares issued (in shares)	20,194,474	20,194,474	19,606,449
Treasury Stock (in shares)	4,651,719	4,678,736	4,624,348

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
INTEREST AND DIVIDEND INCOME
Interest and Fees on Loans		$ 25,183	$ 24,874
Interest on Deposits at Banks		85	124
Interest and Dividends on Investment Securities:
Fully Taxable		1,506	2,193
Exempt from Federal Taxes		920	1,035
Total Interest and Dividend Income		27,694	28,226
INTEREST EXPENSE
Interest-Bearing Checking Accounts		219	487
Savings Deposits		565	2,471
Time Deposits over $250,000		120	533
Other Time Deposits		222	1,000
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase		2	22
Federal Home Loan Bank Advances		193	429
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts		169	228
Interest on Financing Leases		49	50
Total Interest Expense		1,539	5,220
NET INTEREST INCOME		26,155	23,006
Provision for Credit Losses		(648)	2,772
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES		26,803	20,234
NONINTEREST INCOME
Insurance Commissions		1,640	1,632
Net Gain (Loss) on Securities		160	(374)
Net Gain on Sales of Loans		1,415	213
Other Operating Income		406	1,559
Total Noninterest Income		8,608	7,694
NONINTEREST EXPENSE
Salaries and Employee Benefits		11,138	10,383
Occupancy Expenses, Net		1,593	1,449
Technology and Equipment Expense		3,459	3,352
FDIC Assessments		270	219
Other Operating Expense		2,218	2,351
Total Noninterest Expense		18,678	17,754
INCOME BEFORE PROVISION FOR INCOME TAXES		16,733	10,174
Provision for Income Taxes		3,453	2,047
NET INCOME		$ 13,280	$ 8,127
Average Shares Outstanding:
Basic (in shares)	[1]	15,528	15,446
Diluted (in shares)	[1]	15,563	15,476
Per Common Share:
Basic Earnings (in dollars per share)		$ 0.86	$ 0.53
Diluted Earnings (in dollars per share)		$ 0.85	$ 0.53
Income From Fiduciary Activities
NONINTEREST INCOME
Revenue from contract with customer		$ 2,378	$ 2,213
Fees for Other Services to Customers
NONINTEREST INCOME
Revenue from contract with customer		$ 2,609	$ 2,451
[1]	2020 Share and Per Share Amounts have been restated for the September 25, 2020 3% stock dividend.

Consolidated Statements of In_2

Consolidated Statements of Income (Parenthetical)	Sep. 25, 2020
Income Statement [Abstract]
Stock dividend, percent	3.00%

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net Income	$ 13,280	$ 8,127
Other Comprehensive (Loss) Income, Net of Tax:
Net Unrealized Securities Holding (Loss) Gain Arising During the Period	(3,812)	4,098
Net Unrealized Gain (Loss) on Cash Flow Hedge Agreements	1,475	(219)
Reclassification of Net Unrealized Gain on Cash Flow Hedge Agreements to Interest Expense	(20)	0
Amortization of Net Retirement Plan Actuarial Loss	34	27
Amortization of Net Retirement Plan Prior Service Cost	43	39
Other Comprehensive (Loss) Income	(2,280)	3,945
Comprehensive Income	$ 11,000	$ 12,072

Consolidated Statements of Chan

Consolidated Statements of Changes In Stockholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common StockCumulative Effect, Period of Adoption, Adjusted Balance	Additional Paid-In Capital	Additional Paid-In CapitalCumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings	Retained EarningsCumulative Effect, Period of Adoption, Adjustment	Retained EarningsCumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive LossCumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock	Treasury StockCumulative Effect, Period of Adoption, Adjusted Balance
Stockholders' equity, beginning balance at Dec. 31, 2019	$ 301,728			$ 19,606		$ 335,355		$ 33,218			$ (6,357)		$ (80,094)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	8,127							8,127
Other Comprehensive Income	3,945										3,945
Cash Dividends Paid	(3,904)							(3,904)
Stock Options Exercised, Net	343					199							144
Shares Issued Under the Employee Stock Purchase Plan	121					84							37
Shares Issued for Dividend Reinvestment Plans	442					280							162
Stock-Based Compensation Expense	103					103
Purchases of Treasury Stock	(1,507)												(1,507)
Stockholders' equity, ending balance at Mar. 31, 2020	309,398			19,606		336,021		37,441			(2,412)		(81,258)
Stockholders' equity, beginning balance at Dec. 31, 2020	334,392	$ 120	$ 334,512	20,194	$ 20,194	353,662	$ 353,662	41,899	$ 120	$ 42,019	(816)	$ (816)	(80,547)	$ (80,547)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	13,280							13,280
Other Comprehensive Income	(2,280)										(2,280)
Cash Dividends Paid	(4,036)							(4,036)
Stock Options Exercised, Net	156					94							62
Shares Issued Under the Directors' Stock	98					70							28
Shares Issued Under the Employee Stock Purchase Plan	124					86							38
Shares Issued for Dividend Reinvestment Plans	455					342							113
Stock-Based Compensation Expense	104					104
Stockholders' equity, ending balance at Mar. 31, 2021	$ 342,413			$ 20,194		$ 354,358		$ 51,263			$ (3,096)		$ (80,306)

Consolidated Statements of Ch_2

Consolidated Statements of Changes In Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Cash Dividends Paid, per Share (in dollars per share)	$ 0.260	$ 0.252
Stock Options Exercised (in shares)	6,927	14,282
Shares Issued Under the Directors' Stock Plan (in shares)	3,172
Shares Issued Under Employee Stock Purchase Plan (in shares)	4,269	3,648
Shares Issued for Dividend Reinvestment Plans (in shares)	12,649	16,001
Purchase of Treasury Stock (in shares)		50,021

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash Flows from Operating Activities:
Net Income	$ 13,280	$ 8,127
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Provision for Credit Losses	(648)	2,772
Depreciation and Amortization	1,951	1,597
Net (Gain) Loss on Securities Transactions	(160)	374
Loans Originated and Held-for-Sale	(24,037)	(9,322)
Proceeds from the Sale of Loans Held-for-Sale	32,093	7,975
Net Gain on the Sale of Loans	(1,415)	(213)
Net Loss (Gain) on the Sale of Premises and Equipment, Other Real Estate Owned and Repossessed Assets	90	(91)
Contributions to Retirement Benefit Plans	(146)	(195)
Deferred Income Tax Expense (Benefit)	349	(873)
Shares Issued Under the Directors’ Stock Plan	98	0
Stock-Based Compensation Expense	104	103
Tax Benefit from Exercise of Stock Options	13	28
Net Increase in Other Assets	(3,077)	(5,719)
Net Increase in Other Liabilities	1,624	8,563
Net Cash Provided By Operating Activities	20,119	13,126
Cash Flows from Investing Activities:
Proceeds from the Maturities and Calls of Securities Available-for-Sale	25,977	17,444
Purchases of Securities Available-for-Sale	(130,481)	(33,201)
Proceeds from the Maturities and Calls of Securities Held-to-Maturity	4,291	7,075
Purchases of Securities Held-to-Maturity	(619)	(717)
Net Increase in Loans	(51,866)	(27,317)
Proceeds from the Sales of Premises and Equipment, Other Real Estate Owned and Repossessed Assets	259	781
Purchase of Premises and Equipment	(1,311)	(1,072)
Net (Increase) Decrease in FHLB and Federal Reserve Bank Stock	(11)	4,938
Net Cash Used By Investing Activities	(153,761)	(32,069)
Cash Flows from Financing Activities:
Net Increase in Deposits	218,862	194,951
Net Decrease in Short-Term Federal Home Loan Bank Borrowings	0	(130,000)
Net (Decrease) Increase in Short-Term Borrowings	(10,691)	6,810
Finance Lease Payments	(12)	(5)
Federal Home Loan Bank Advances	0	40,000
Repayments of Federal Home Loan Bank Term Advances	0	(20,000)
Purchase of Treasury Stock	0	(1,507)
Stock Options Exercised, Net	156	343
Shares Issued Under the Employee Stock Purchase Plan	124	121
Shares Issued for Dividend Reinvestment Plans	455	442
Cash Dividends Paid	(4,036)	(3,904)
Net Cash Provided By Financing Activities	204,858	87,251
Net Increase in Cash and Cash Equivalents	71,216	68,308
Cash and Cash Equivalents at Beginning of Period	380,991	70,221
Cash and Cash Equivalents at End of Period	452,207	138,529
Supplemental Disclosures to Statements of Cash Flow Information:
Interest on Deposits and Borrowings	1,626	5,264
Income Taxes	0	344
Non-cash Investing and Financing Activity:
Transfer of Loans to Other Real Estate Owned and Repossessed Assets	$ 349	$ 371

Accounting Policies

Accounting Policies	3 Months Ended
	Mar. 31, 2021
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 March 31, 2021, December 31, 2020 and March 31, 2020; the results of operations for the three month periods ended March 31, 2021 and 2020; the consolidated statements of comprehensive income for the three month periods ended March 31, 2021 and 2020; the changes in stockholders' equity for the three month periods ended March 31, 2021 and 2020; and the cash flows for the three month periods ended March 31, 2021 and 2020. All such adjustments are of a normal recurring nature. 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, 2020 included in Arrow's Annual Report on Form 10-K for the year ended December 31, 2020. 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 (US GAAP) 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. Due to the uncertainty regarding the impact of the COVID-19 pandemic, management utilized estimates and assumptions in its evaluation of potential impairment of Arrow's right-of-use lease assets, goodwill and intangible assets. Our most significant estimate is the allowance for credit losses. Other estimates include the fair value of financial statements, evaluation of pension and other post-retirement liabilities, an analysis of a need for a valuation allowance for deferred tax assets and a reserve for unfunded loan commitments recorded as an other liability. 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 credit losses. In connection with the determination of the allowance for credit losses management obtains economic forecasts from reliable sources and appraisals for properties. The allowance for credit losses is management’s best estimate of the life of loan losses as of the balance sheet date. While management uses available information to recognize losses on loans, future adjustments to the allowance for credit losses may be necessary based on changes in economic conditions. Allowance for Credit Losses – Loans Accounting Standards Update (“ASU”) 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“CECL”) approach requires an estimate of the credit losses expected over the life of a loan (or pool of loans). It replaces the incurred loss approach’s threshold that required the recognition of a credit loss when it was probable a loss event was incurred. The allowance for credit losses is a valuation account that is deducted from, or added to, the loans’ amortized cost basis to present the net, lifetime amount expected to be collected on the loans. Loan losses are charged off against the allowance when management believes a loan balance is confirmed to be uncollectible. Expected recoveries do not exceed the aggregate of amounts previously charged off and expected to be charged off. Management estimates the allowance balance using relevant available information from internal and external sources related to past events, current conditions, and a reasonable and supportable forecast. Historical credit loss experience provides the basis for the estimation of expected credit losses. Company historical loss experience was supplemented with peer information when there was insufficient loss data for the Company. Peer selection was based on a review of institutions with comparable loss experience as well as loan yield, bank size, portfolio concentration and geography. Adjustments to historical loss information are made for differences in current loan-specific risk characteristics such as differences in credit concentrations, delinquency level, collateral values and underwriting standards as well as changes in economic conditions or other relevant factors. Management judgment is required at each point in the measurement process. Portfolio segment is defined as the level at which an entity develops and documents a systematic methodology to determine its allowance for credit losses. Upon adoption of CECL, management revised the manner in which loans were pooled for similar risk characteristics. Management developed portfolio segments for estimating loss based on type of borrower and collateral as follows: Commercial Loans Commercial Real Estate Loans Consumer Loans Residential Loans Further details related to loan portfolio segments is included in Note 4 Loans. Historical credit loss experience for both the Company and segment-specific peers provides the basis for the estimation of expected credit losses. The Company utilized regression analyses of peer data, of which the Company is included, where observed credit losses and selected economic factors were utilized to determine suitable loss drivers for modeling lifetime probability of default ("PD") rates. Arrow uses the discounted cash flow ("DCF") method to estimate expected credit losses for the commercial, commercial real estate, and residential segments. For each of these loan segments, Arrow generates cash flow projections at the instrument level wherein payment expectations are adjusted for estimated prepayment speed, curtailments, time to recovery, PD, and segment-specific loss given default ("LGD") risk factors. The modeling of expected prepayment speeds, curtailment rates, and time to recovery are based on historical internal data and adjusted, if necessary, based on the reasonable and supportable forecast of economic conditions. For the loan segments utilizing the DCF method, (commercial, commercial real estate, and residential) management utilizes externally developed economic forecasts of the following economic factors as loss drivers: national unemployment, gross domestic product and home price index ("HPI"). The economic forecast is applied over a reasonable and supportable forecast period. Arrow utilizes a six quarter reasonable and supportable forecast period with a four quarter reversion to the historic mean on a straight-line basis. The combination of adjustments for credit expectations (default and loss) and timing expectations (prepayment, curtailment, and time to recovery) produces an expected cash flow stream at the instrument level. Instrument effective yield is calculated, net of the impacts of prepayment assumptions, and the instrument expected cash flows are then discounted at that effective yield to produce an instrument-level net present value of expected cash flows (“NPV”). An allowance for credit loss is established for the difference between the instrument’s NPV and amortized cost basis. The contractual term excludes expected extensions, renewals, and modifications unless either of the following applies: management has a reasonable expectation at the reporting date that a troubled debt restructuring (“TDR”) will be executed with an individual borrower or the extension or renewal options are included in the original or modified contract at the reporting date and are not unconditionally cancellable by Arrow. Arrow uses the vintage analysis method to estimate expected credit losses for the consumer loan segment. The vintage method was selected since the loans within the consumer loan segment are homogeneous, not just by risk characteristic, but loan structure. The loss rate is applied to the loan origination amounts. Arrow maintains, over the life of the loan, the loss curve by vintage year. If estimated losses computed by the vintage method need to be adjusted based on current conditions and the reasonable and supportable economic forecast, these adjustments may be incorporated over a six quarter reasonable and supportable forecast period, reverting to historical losses using a straight-line method over a two year period. The vintage and DCF models also consider the need to qualitatively adjust expected loss estimates for information not already captured in the quantitative loss estimation process. Qualitative considerations include limitations inherent in the quantitative model; trends experienced in nonperforming and delinquent loans; changes in value of underlying collateral; changes in lending policies and procedures; nature and composition of loans; portfolio concentrations that may affect loss experience across one or more components or the portfolio; the experience, ability and depth of lending management and staff; the Company’s credit review system; and the effect of external factors; such as competition, legal and regulatory requirements. These qualitative factor adjustments may increase or decrease the Company's estimate of expected credit losses so that the allowance for credit loss is reflective of the estimate of lifetime losses that exist in the loan portfolio at the balance sheet date. All loans not included in the vintage analysis method that exceed $250,000 which are on nonaccrual, are evaluated on an individual basis. For collateral dependent financial assets where Arrow has determined that foreclosure of the collateral is probable, or where the borrower is experiencing financial difficulty and Arrow expects repayment of the financial asset to be provided substantially through the operation or sale of the collateral, Arrow has elected a practical expedient to measure the allowance for credit loss as the difference between the fair value of the collateral less cost to sell, and the amortized cost basis of the asset as of the measurement date. In the event where the repayment of a collateral dependent financial asset is expected to be provided substantially through the operating of the collateral, Arrow will use fair value of the collateral at the reporting date when recording the net carrying amount of the asset and determining the allowance for credit losses. When repayment is expected to be from the sale of the collateral, expected credit losses are calculated as the amount by which the amortized cost basis of the financial asset exceeds the fair value of the underlying collateral less estimated cost to sell. The allowance for credit losses may be zero if the fair value of the collateral at the measurement date exceeds the amortized cost basis of the financial asset. Except as set forth below, a loan that has been modified or renewed is considered a TDR when two conditions are met: • The borrower is experiencing financial difficulty, and • Concessions are made for the borrower's benefit that would not otherwise be considered for a borrower or transaction with similar credit risk characteristics. Arrow's allowance for credit losses reflects all effects of a TDR when an individual asset is specifically identified as a reasonably expected TDR. The Company has determined that a TDR is reasonably expected no later than the point it is determined that modification is the best course of action and it is at least reasonably possible that the troubled borrower will accept some form of concession to avoid a default. Reasonably expected TDRs and executed non-performing TDRs are evaluated individually to determine the required allowance for credit losses. TDRs performing in accordance with their modified contractual terms for a reasonable period of time may be included in Arrow's existing pools based on the underlying risk characteristics of the loan to measure the allowance for credit losses. In accordance with the Coronavirus Aid, Relief, and Economic Security (CARES) Act and ASC Subtopic 310-40, as extended by the Consolidated Appropriations Act, 2021, if a qualifying loan modification was made for a borrower as the result of the COVID-19 pandemic, this modification was not considered a TDR. Estimated Credit Losses on Off-Balance Sheet Credit Exposures Recognized as Other Liabilities The Company estimates expected credit losses over the contractual period in which the Company has exposure to credit risk via a contractual obligation to extend credit, unless that obligation is unconditionally cancellable by the Company. The allowance for credit losses on off-balance sheet credit exposures recognized in other liabilities, is adjusted as an expense in other noninterest expense. The estimate includes consideration of the likelihood that funding will occur and an estimate of expected credit losses on commitments expected to be funded over their estimated lives. Estimating credit losses on unfunded commitments requires the Bank to consider the following categories of off-balance sheet credit exposure: unfunded commitments to extend credit, unfunded lines of credit, and standby letters of credit. Each of these unfunded commitments is then analyzed for a probability of funding to calculate a probable funding amount. The life of loan loss factor by related portfolio segment from the loan allowance for credit loss calculation is then applied to the probable funding amount to calculate the estimated credit losses on off-balance sheet credit exposures recognized as other liabilities. Allowance for Credit Losses – Held to Maturity ("HTM") Debt Securities Arrow's HTM debt securities are also required to utilize the CECL approach to estimate expected credit losses. Management measures expected credit losses on HTM debt securities on a collective basis by major security types that share similar risk characteristics, such as financial asset type and collateral type adjusted for current conditions and reasonable and supportable forecasts. Management classifies the HTM portfolio into the following major security types: U.S. government agency or U.S. government sponsored mortgage-backed and collateralized mortgage obligations securities, and state and municipal debt securities. The mortgage-backed and collateralized mortgage obligations HTM securities are issued by U.S. government entities and agencies. These securities are either explicitly or implicitly guaranteed by the U.S. government as to timely repayment of principal and interest, are highly rated by major rating agencies, and have a long history of no credit losses. Therefore, the Company did not record a credit loss for these securities. State and municipal bonds carry an investment grade from an accredited ratings agency, primarily with an investment grade rating. In addition, the Company has a limited amount of New York state local municipal bonds that are not rated. The estimate of expected credit losses on the HTM portfolio is based on the expected cash flows of each individual CUSIP over its contractual life and utilized a municipal loss forecast model for determining PD and LGD rates. Management may exercise discretion to make adjustments based on environmental factors. A calculated expected credit loss for individual securities was determined using the PD and LGD rates. Arrow determined that the expected credit loss on its municipal bond portfolio was de minimis, and therefore, an allowance for credit losses was not recorded. Allowance for Credit Losses – Available for Sale ("AFS") Debt Securities The impairment model for AFS debt securities differs from the CECL approach utilized by HTM debt securities since AFS debt securities are measured at fair value rather than amortized cost. For AFS debt securities in an unrealized loss position, the Bank first assesses whether it intends to sell, or it is more likely than not that it will be required to sell the security before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the security’s amortized cost basis is written down to fair value through income. For AFS debt securities that do not meet the aforementioned criteria, in making this assessment, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, adverse conditions specifically related to the security, failure of the issuer of the debt security to make scheduled interest or principal payments, among other factors. If this assessment indicates that a credit loss exists, the present value of cash flows expected to be collected from the security are compared to the amortized cost basis of the security. The cash flows are estimated using information relevant to the collectability of the security, including information about past events, current conditions and reasonable and supportable forecasts. If the present value of cash flows expected to be collected is less than the amortized cost basis, a credit loss exists and an allowance for credit losses is recorded for the credit loss, limited by the amount that the fair value is less than the amortized cost basis. Any impairment that has not been recorded through an allowance for credit losses is recognized in other comprehensive income. Accrued Interest Receivable Upon adoption of CECL on January 1, 2021, the Company made the following elections regarding accrued interest receivable: (1) presented accrued interest receivable balances separately within the other assets balance sheet line item; (2) excluded interest receivable that is included in amortized cost of financing receivables from related disclosures requirements and (3) continued the Company's policy to write off accrued interest receivable by reversing interest income. For loans, write off typically occurs upon becoming over 90 to 120 days past due and therefore the amount of such write offs are immaterial. Historically, the Company has not experienced uncollectible accrued interest receivable on investment securities. The following accounting standards have been adopted in the first three months of 2021: In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments and all related subsequent amendments thereto. ASU 2016-13 introduces new guidance that make substantive changes to the accounting for credit losses. ASU 2016-13 introduces the CECL model, which applies to financial assets subject to credit losses and measured at amortized cost, as well as certain off-balance sheet credit exposures. This includes loans, loan commitments, standby letters of credit, net investments in leases recognized by a lessor and HTM debt securities. The CECL model requires an entity to estimate credit losses expected over the life of an exposure, considering information about historical events, current conditions and reasonable and supportable forecasts and is generally expected to result in earlier recognition of credit losses. ASU 2016-13 also modifies certain provisions of the current other-than-temporary impairment model for AFS debt securities. Credit losses on AFS debt securities will be limited to the difference between the security’s amortized cost basis and its fair value and will be recognized through an allowance for credit losses rather than as a direct reduction in amortized cost basis. ASU 2016-13 also provides for a simplified accounting model for purchased financial assets with more than insignificant credit deterioration since their origination. ASU 2016-13 requires expanded disclosures including, but not limited to, (1) information about the methods and assumptions used to estimate expected credit losses, including changes in the factors that influenced management’s estimate and the reasons for those changes, (2) financing receivables and net investment in leases measured at amortized cost, further disaggregation of information about the credit quality of those assets and (3) a rollforward of the allowance for credit losses for HTM and AFS securities. The standard also changes the accounting for purchased credit-impaired debt securities and loans. ASU 2016-13 was effective for the Company on January 1, 2020. As permitted by the CARES Act, Arrow deferred the adoption of the CECL methodology in determining credit losses until January 1, 2021. Management expects that the CECL model may create more volatility in the level of our allowance for loan losses from quarter to quarter as changes in the level of allowance for loan losses will be dependent upon, among other things, macroeconomic forecasts and conditions, loan portfolio volumes and credit quality. Arrow adopted CECL on January 1, 2021 (“Day 1”) using the modified retrospective method for all financial assets measured at amortized cost and off-balance-sheet credit exposures recognized as other liabilities. Results for reporting periods beginning after January 1, 2021 are presented under ASC 326 while prior period amounts continue to be reported in accordance with previously applicable GAAP. The Company recorded a net increase to retained earnings of $120,000 as of January 1, 2021 for the cumulative effect of adopting ASC 326. The transition adjustment includes a $1.3 million decrease to the allowance for credit losses on loans, a $1.1 million increase to the estimated credit losses on off-balance sheet credit exposures recorded as other liabilities, and a $41,000 impact to the deferred tax liability. The Company did not record an allowance for HTM debt securities on January 1, 2021 as the amount of credit risk was deemed immaterial. The Company did not record an allowance for credit losses on its AFS debt securities under the newly codified AFS debt security impairment model, as the majority of these securities are government agency-backed securities for which the risk of loss is minimal. Refer to Note 3 Investment Securities and Note 4 Loans (under the captions "Allowance for Credit Losses" and "Loan Credit Quality Indicators") to the Company’s unaudited interim consolidated financial statements included in this Form 10-Q for more information. In December 2019, the FASB issued ASU 2019-12 "Simplifying the Accounting for Income Taxes" (Topic 740), which removes certain exceptions to the general principles in Topic 740 and improves consistent application of and simplifies GAAP for other areas of Topic 740 by clarifying and amending existing guidance. This ASU is effective for fiscal years beginning after December 15, 2020 and interim periods within those fiscal years, with early adoption permitted. Arrow adopted this standard on January 1, 2021. The Company does not expect that the adoption of this standard will have a material impact on its financial position or the results of operations in periods subsequent to its adoption.

Cash and Cash Equivalents

Cash and Cash Equivalents	3 Months Ended
	Mar. 31, 2021
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	CASH AND CASH EQUIVALENTS (In Thousands) The following table is the schedule of Cash and Cash Equivalents at March 31, 2021, December 31, 2020 and March 31, 2020. March 31, 2021 December 31, 2020 March 31, 2020 Cash and Due From Banks $ 45,602 $ 42,116 $ 32,525 Interest-Bearing Deposits at Banks 406,605 338,875 106,004 Total Cash and Cash Equivalents $ 452,207 380,991 138,529 Supplemental Information: Total required reserves, including vault cash and Federal Reserve Bank deposits 1 $ — $ — $ — Restricted cash pledged as collateral related to swap agreements and included in Cash and Due From Banks $ — $ 500 $ — 1. Until March 2020, Arrow was required to maintain reserve balances with the Federal Reserve Bank of New York. In March 2020, the Federal Reserve Board reduced reserve requirement ratios to zero percent to free up liquidity in the banking industry to support lending to households and businesses.

Investment Securities

Investment Securities	3 Months Ended
	Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Investment Securities	INVESTMENT SECURITIES (In Thousands) The following table is the schedule of Available-For-Sale Securities at March 31, 2021, December 31, 2020 and March 31, 2020: Available-For-Sale Securities U.S. Government & Agency State and Mortgage- Corporate Total March 31, 2021 Available-For-Sale Securities, $ 110,001 $ 508 $ 349,911 $ 1,000 $ 461,420 Gross Unrealized Gains 138 — 6,276 — 6,414 Gross Unrealized Losses (1,769) — (1,776) (200) (3,745) Available-For-Sale Securities, 108,370 508 354,411 800 464,089 Available-For-Sale Securities, 352,214 Maturities of Debt Securities, Within One Year $ — $ 68 $ 58 $ — $ 126 From 1 - 5 Years 65,001 40 289,741 — 354,782 From 5 - 10 Years 45,000 400 60,112 1,000 106,512 Over 10 Years — — — — — Maturities of Debt Securities, Within One Year $ — $ 68 $ 64 $ — $ 132 From 1 - 5 Years 63,774 40 295,370 — 359,184 From 5 - 10 Years 44,596 400 58,977 800 104,773 Over 10 Years — — — — — Securities in a Continuous Less than 12 Months $ 103,231 $ — $ 120,780 $ — $ 224,011 12 Months or Longer — — — 800 800 Total $ 103,231 $ — $ 120,780 $ 800 $ 224,811 Number of Securities in a 14 — 16 1 31 Unrealized Losses on Less than 12 Months $ 1,769 $ — $ 1,776 $ — $ 3,545 12 Months or Longer — — — 200 200 Total $ 1,769 $ — $ 1,776 $ 200 $ 3,745 Disaggregated Details: US Agency Obligations, $ 110,001 US Agency Obligations, 108,370 US Government Agency $ 11,582 US Government Agency 11,658 Government Sponsored Entity 338,329 Government Sponsored Entity 342,753 Available-For-Sale Securities U.S. Government & Agency State and Mortgage- Corporate Total December 31, 2020 Available-For-Sale Securities, $ 65,002 $ 528 $ 290,967 $ 1,000 $ 357,497 Gross Unrealized Gains 184 — 7,934 — 8,118 Gross Unrealized Losses (74) — (54) (200) (328) Available-For-Sale Securities, 65,112 528 298,847 800 365,287 Available-For-Sale Securities, 244,411 Securities in a Continuous Less than 12 Months $ 29,926 $ — $ — $ — $ 29,926 12 Months or Longer — — 4,882 800 5,682 Total $ 29,926 $ — $ 4,882 $ 800 $ 35,608 Number of Securities in a 4 — 1 1 6 Unrealized Losses on Less than 12 Months $ 74 $ — $ — $ — $ 74 12 Months or Longer — — 54 200 254 Total $ 74 $ — $ 54 $ 200 $ 328 Disaggregated Details: US Agency Obligations, $ 65,002 US Agency Obligations, 65,112 US Government Agency $ 12,696 US Government Agency 12,683 Government Sponsored Entity 278,271 Government Sponsored Entity 286,164 Available-For-Sale Securities U.S. Government & Agency State and Mortgage- Corporate Total March 31, 2020 Available-For-Sale Securities, $ 5,002 $ 723 $ 365,333 $ 1,000 $ 372,058 Gross Unrealized Gains 179 — 7,484 — 7,663 Gross Unrealized Losses — — (1,335) (200) (1,535) Available-For-Sale Securities, 5,181 723 371,482 800 378,186 Available-For-Sale Securities, 273,124 Securities in a Continuous Less than 12 Months $ — $ — $ 18,846 $ — $ 18,846 12 Months or Longer — — 59,262 800 60,062 Total $ — $ — $ 78,108 $ 800 $ 78,908 Number of Securities in a — — 27 1 28 Unrealized Losses on Securities Less than 12 Months $ — $ — $ 316 $ — $ 316 12 Months or Longer — — 1,019 200 1,219 Total $ — $ — $ 1,335 $ 200 $ 1,535 Disaggregated Details: US Agency Obligations, $ 5,002 US Agency Obligations, 5,181 US Government Agency $ 58,089 US Government Agency 57,091 Government Sponsored Entity 307,244 Government Sponsored Entity 314,391 At March 31, 2021, there was no allowance for credit losses for the available for sale securities portfolio. The following table is the schedule of Held-To-Maturity Securities at March 31, 2021, December 31, 2020 and March 31, 2020: Held-To-Maturity Securities State and Mortgage- Total March 31, 2021 Held-To-Maturity Securities, $ 191,202 $ 23,359 $ 214,561 Gross Unrealized Gains 5,843 956 6,799 Gross Unrealized Losses — — — Held-To-Maturity Securities, 197,045 24,315 221,360 Held-To-Maturity Securities, 207,595 Maturities of Debt Securities, Within One Year $ 16,513 $ 1,586 $ 18,099 From 1 - 5 Years 139,576 21,773 161,349 From 5 - 10 Years 34,110 — 34,110 Over 10 Years 1,003 — 1,003 Maturities of Debt Securities, Within One Year $ 16,580 $ 1,639 $ 18,219 From 1 - 5 Years 143,850 22,676 166,526 From 5 - 10 Years 35,599 — 35,599 Over 10 Years 1,016 — 1,016 Securities in a Continuous Less than 12 Months $ — $ — $ — 12 Months or Longer — — — Total $ — $ — $ — Number of Securities in a — — — Unrealized Losses on Securities Less than 12 Months $ — $ — $ — 12 Months or Longer — — — Total $ — $ — $ — Disaggregated Details: US Government Agency $ 8,310 US Government Agency 8,597 Government Sponsored Entity 15,049 Government Sponsored Entity 15,718 Held-To-Maturity Securities State and Mortgage- Total December 31, 2020 Held-To-Maturity Securities, $ 192,352 $ 26,053 $ 218,405 Gross Unrealized Gains 7,080 1,094 8,174 Gross Unrealized Losses (3) — (3) Held-To-Maturity Securities, 199,429 27,147 226,576 Held-To-Maturity Securities, 211,176 Securities in a Continuous Less than 12 Months $ 1,513 $ — $ 1,513 12 Months or Longer — — — Total $ 1,513 $ — $ 1,513 Number of Securities in a 4 — 4 Unrealized Losses on Less than 12 Months $ 3 $ — $ 3 12 Months or Longer — — — Total $ 3 $ — $ 3 Disaggregated Details: US Government Agency $ 9,440 US Government Agency 9,762 Government Sponsored Entity 16,613 Government Sponsored Entity 17,385 March 31, 2020 Held-To-Maturity Securities, $ 204,148 $ 34,372 $ 238,520 Gross Unrealized Gains 3,104 1,329 4,433 Gross Unrealized Losses (149) — (149) Held-To-Maturity Securities, 207,103 35,701 242,804 Held-To-Maturity Securities, 231,539 Securities in a Continuous Less than 12 Months $ 5,625 $ — $ 5,625 12 Months or Longer 1,867 — 1,867 Total $ 7,492 $ — $ 7,492 Number of Securities in a 16 — 16 Held-To-Maturity Securities State and Mortgage- Total Unrealized Losses on Less than 12 Months $ 16 $ — $ 16 12 Months or Longer 133 — 133 Total $ 149 $ — $ 149 Disaggregated Details: US Government Agency $ 1,594 US Government Agency 1,655 Government Sponsored Entity 32,778 Government Sponsored Entity 34,046 In the tables above, maturities of mortgage-backed securities are included based on their expected average lives. Actual maturities will differ 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 March 31, 2021, December 31, 2020 and March 31, 2020, do not reflect any deterioration of the credit worthiness of the issuing entities. Arrow evaluates available-for-sale debt securities in unrealized loss positions at each measurement date to determine whether the decline in the fair value below the amortized cost basis (impairment) is due to credit-related factors or noncredit-related factors. Any impairment that is not credit related is recognized in other comprehensive income, net of applicable taxes. Credit-related impairment is recognized within the allowance for credit losses on the balance sheet, limited to the amount by which the amortized cost basis exceeds the fair value, with a corresponding adjustment to earnings via credit loss expense. Arrow determined that at March 31, 2021, gross unrealized losses were primarily attributable to changes in interest rates, relative to when the investment securities were purchased, and not due to the credit quality of the investment securities. Arrow does not intend to sell, nor is it more likely than not that Arrow will be required to sell the security before recovery of its amortized cost basis, which may be at maturity. Therefore, Arrow carried no allowance for credit loss at March 31, 2021 and there was no credit loss expense recognized by Arrow with respect to the securities portfolio during the three months ended March 31, 2021. Arrow's held to maturity debt securities are comprised of U.S. government agencies, U.S. government-sponsored enterprises or state and municipal obligations. U.S. government agencies and U.S. government-sponsored enterprise securities carry the explicit and/or implicit guarantee of the U.S. government, are widely recognized as “risk free,” and have a long history of zero credit loss. Arrow determined that the expected credit loss on its held to maturity debt portfolio was immaterial and therefore no allowance for credit loss was recorded as of March 31, 2021. The following table is the schedule of Equity Securities at March 31, 2021, December 31, 2020 and March 31, 2020: Equity Securities March 31, 2021 December 31, 2020 March 31, 2020 Equity Securities, at Fair Value $1,796 $1,636 $1,689 The following is a summary of realized and unrealized gains and losses recognized in net income on equity securities during the three month period ended March 31, 2021 and 2020: Quarterly Period Ended: March 31, 2021 March 31, 2020 Net Gain (Loss) on Equity Securities $ 160 $ (374) Less: Net gain (loss) recognized during the reporting period on equity securities sold during the period — — Unrealized net gain (loss) recognized during the reporting period on equity securities still held at the reporting date $ 160 $ (374)

Loans

Loans	3 Months Ended
	Mar. 31, 2021
Receivables [Abstract]
Loans	LOANS (In Thousands) Loan Categories and Past Due Loans The following two tables present loan balances outstanding as of March 31, 2021, and an analysis of the recorded investment in loans that are past due at these dates. Generally, Arrow considers a loan past due 30 or more days when the borrower is two payments past due. Loans held-for-sale of $4,443, $11,085 and $1,905 as of March 31, 2021, December 31, 2020 and March 31, 2020, respectively, are included in the residential real estate balances for current loans. Schedule of Past Due Loans by Loan Category Commercial Commercial Real Estate Consumer Residential Total March 31, 2021 Loans Past Due 30-59 Days $ 63 $ 143 $ 2,233 $ 2,097 $ 4,536 Loans Past Due 60-89 Days 34 2,723 822 156 3,735 Loans Past Due 90 or more Days 38 1,474 592 1,700 3,804 Total Loans Past Due 135 4,340 3,647 3,953 12,075 Current Loans 288,416 577,167 857,524 904,061 2,627,168 Total Loans $ 288,551 $ 581,507 $ 861,171 $ 908,014 $ 2,639,243 December 31, 2020 Loans Past Due 30-59 Days $ 102 $ — $ 4,976 $ 261 $ 5,339 Loans Past Due 60-89 Days 113 — 2,713 1,279 4,105 Loans Past Due 90 or more Days 78 1,658 1,379 1,224 4,339 Total Loans Past Due 293 1,658 9,068 2,764 13,783 Current Loans 240,261 570,129 850,700 920,157 2,581,247 Total Loans $ 240,554 $ 571,787 $ 859,768 $ 922,921 $ 2,595,030 March 31, 2020 Loans Past Due 30-59 Days $ 173 $ 461 $ 5,636 $ 1,630 $ 7,900 Loans Past Due 60-89 Days 70 110 1,451 212 1,843 Loans Past Due 90 or more Days 8 911 549 1,525 2,993 Total Loans Past Due 251 1,482 7,636 3,367 12,736 Current Loans 146,849 524,648 817,073 912,887 2,401,457 Total Loans $ 147,100 $ 526,130 $ 824,709 $ 916,254 $ 2,414,193 Schedule of Non Accrual Loans by Category Commercial March 31, 2021 Commercial Real Estate Consumer Residential Total Loans 90 or More Days Past Due $ — $ — $ — $ 242 $ 242 Nonaccrual Loans 64 4,364 746 2,913 8,087 Nonaccrual With No Allowance for Credit Loss 64 1,641 746 2,913 5,364 Interest Income on Nonaccrual Loans — 14 — — — December 31, 2020 Loans 90 or More Days Past Due $ — $ 184 $ — $ 44 $ 228 Nonaccrual Loans 78 1,475 1,470 3,010 6,033 March 31, 2020 Loans 90 or More Days Past Due $ 5 $ 238 $ 93 $ 101 $ 437 Nonaccrual Loans 63 1,445 715 2,720 4,943 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 our 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. Generally, 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 to support the borrowing, as permitted by applicable law. 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 typically 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. Many projects will ultimately be used by the borrowers' businesses, while others are developed for resale. These real estate loans are also typically secured by first liens on the real estate, which may include apartments, commercial structures, housing businesses, 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 - This category is primarily comprised of automobile loans. Arrow primarily finances the purchases of automobiles indirectly through dealer relationships located throughout upstate New York and Vermont. Most automobile loans carry a fixed rate of interest with principal repayment terms typically ranging from three one Residential - Residential real estate loans consist primarily of loans secured by first or second mortgages on primary residences. Arrow originates fixed-rate and adjustable-rate and fixed-rate one-to-four-family residential real estate loans for the construction, purchase real estate or refinancing of an existing mortgage. These loans are collateralized primarily by owner-occupied properties generally located in Arrow'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. Arrow’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 Arrow's general practice to underwrite our 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. Arrow's policy allows for a maximum loan to value ratio of 80%, although periodically higher advances are allowed. Arrow 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. The following tables present the amortized cost basis of collateral-dependent loans by class of loans as of March 31, 2021: March 31, 2021 Collateral Type -Residential Real Estate Collateral Type - Commercial Real Estate Total Loans Commercial $ — $ — $ — Commercial Real Estate — 3,851 3,851 Consumer — — — Residential 1,156 — 1,156 Total $ 1,156 $ 3,851 $ 5,007 Allowance for Credit Losses As previously mentioned in Note 1 Accounting Policies, Arrow's January 1, 2021 adoption of CECL resulted in a significant change to the methodology for estimating the allowance for credit losses as compared to December 31, 2020. The Day 1 decrease in the allowance for credit loss on loans relating to adoption of ASU 2016-13 was $1.3 million. The Company made a policy election to report accrued interest receivable in the other assets line item on the balance sheet. Accrued interest receivable on loans totaled $6.1 million at March 31, 2021 and was excluded from the estimate of credit losses. Loan segments were selected by class code and application code to ensure each segment is comprised of loans with homogenous loan characteristics and similar risk profiles. The resulting loan segments are commercial, commercial real estate, consumer and residential real estate loans. The consumer segment is mainly comprised of automobile loans, and since they are relatively short-term in nature, with similar dollar amounts and collateral, the vintage analysis method was selected to determine the credit loss reserve. The vintage method utilizes Arrow loan data exclusively as the method calculates a loss rate based on the total origination balance of the loans by year and the charge-off and recovery rate of the same origination year. Arrow maintains, over the life of the loan, the loss curve by vintage year. The discounted cash flow method (DCF) is used to calculate the reserve for credit losses for the commercial, commercial real estate and residential real estate segments. Please see Note 1 for a full explanation. The Day 1 and March 31, 2021 allowance for credit losses calculation incorporated a reasonable and supportable forecast period to account for economic conditions utilized in the measurement. The quantitative model utilized an economic forecast sourced from reputable third-parties that reflected economic improvement with a reduction of approximately 1% in the national unemployment rate during the six quarter forecast period, while forecasted gross domestic product peaked in the second quarter of 2021 and remained more favorable for the remainder of the forecast period as compared to the economic forecast used for the Day 1 adoption. The home price index forecast improved significantly in the second and third quarters of 2021 and remained more favorable as compared to the economic forecast used for the Day 1 adoption. The improved economic forecast at March 31, 2021, resulted in a net decrease in the allowance for credit losses of $1.1 million, including the increases due to the increase in loan volume. Management evaluated the results of the quantitative model and determined that qualitative factor adjustments were necessary to reflect the expected life of loss for Arrow's loan portfolio. Management's evaluation considers the allowance for credit losses for loans to be appropriate as of March 31, 2021. The following table details activity in the allowance for credit losses on loans for the three months ended March 31, 2021 and March 31, 2020. Arrow adopted ASU 2016-13 on January 1, 2021. Results for the periods beginning after January 1, 2021 are presented under ASC 326 and prior periods continue to be reported in accordance with previously applicable US GAAP. Allowance for Credit Losses Commercial Commercial Real Estate Consumer Residential Total Rollforward of the Allowance for Credit Losses for the Quarterly Period: December 31, 2020 $ 2,173 $ 9,990 $ 11,562 $ 5,507 $ 29,232 Impact of ASU 2016-13 2,084 2,064 (9,383) 3,935 (1,300) Balance as of January 1, 2021 as adjusted for ASU 2016-13 4,257 12,054 2,179 9,442 27,932 Charge-offs (3) — (627) (3) (633) Recoveries — — 189 — 189 Provision 43 (110) 688 (1,269) (648) March 31, 2021 $ 4,297 $ 11,944 $ 2,429 $ 8,170 $ 26,840 Allowance for Loan Losses Commercial Commercial Real Estate Consumer Residential Total Rollforward of the Allowance for Loan Losses for the Quarterly Period: December 31, 2019 $ 1,386 $ 5,830 $ 9,408 $ 4,563 $ 21,187 Charge-offs (14) — (467) — $ (481) Recoveries — — 159 — $ 159 Provision 267 1,235 904 366 $ 2,772 March 31, 2020 $ 1,639 $ 7,065 $ 10,004 $ 4,929 $ 23,637 Estimated Credit Losses on Off-Balance Sheet Credit Exposures Recognized as Other Liabilities Financial instrument credit losses apply to off-balance sheet credit exposures such as unfunded loan commitments and standby letters of credit. A liability for expected credit losses for off-balance sheet exposures is recognized if the entity has a present contractual obligation to extend the credit and the obligation is not unconditionally cancellable by the entity. The Day 1 adoption of ASU 2016-13, created an allowance for credit loss on off-balance sheet exposures recognized as other liabilities of $1.1 million. Subsequent changes in this allowance are reflected in other operating expenses within the non interest expense category. As of March 31, 2021, the total unfunded commitment off-balance sheet credit exposure was $993 thousand. Individually Evaluated Loans All loans not included in the vintage analysis method that exceed $250,000, which are on nonaccrual status, are evaluated on an individual basis. Arrow made the policy election to apply practical expedient for collateral dependent financial assets when the borrower is experiencing financial difficulty and the repayment is expected through the sale of the collateral. This allows Arrow to use fair value of the collateral at the reporting date adjusted for estimated cost to sell when recording the net carrying amount of the asset and determining the allowance for credit losses for a financial asset. In the event where the repayment of a collateral dependent financial asset is expected to be provided substantially through the operating of the collateral, Arrow will use fair value of the collateral at the reporting date when recording the net carrying amount of the asset and determining the allowance for credit losses. As of March 31, 2021, there were six total relationships identified to be evaluated for loss on an individual basis which had an amortized cost basis of $5.0 million and only one loan had an allowance for credit loss of $556 thousand. Allowance for Credit Losses - Collectively and Individually Evaluated Commercial Commercial Real Estate Consumer Residential Total March 31, 2021 Ending Loan Balance - Collectively Evaluated $ 288,551 $ 577,656 $ 861,171 $ 906,858 $ 2,634,236 Allowance for Credit Losses - Loans Collectively Evaluated 4,297 11,388 2,429 8,170 26,284 Ending Loan Balance - Individually Evaluated — 3,851 — 1,156 5,007 Allowance for Credit Losses - Loans Individually Evaluated — 556 — — 556 The following table presents information pertaining to the allowance for loan losses as of December 31, 2020 and March 31, 2020, as determined in accordance with ASC 310, prior to the adoption of ASU 2016-13: Allowance for Loan Losses - Collectively and Individually Evaluated for Impairment Commercial Commercial Real Estate Consumer Residential Total December 31, 2020 Ending Loan Balance - Collectively Evaluated for Impairment $ 240,507 $ 570,659 $ 859,657 $ 921,504 $ 2,592,327 Allowance for Loan Losses - Loans Collectively Evaluated for Impairment 2,154 9,990 11,562 5,485 $ 29,191 Ending Loan Balance - Individually Evaluated for Impairment 47 1,128 111 1,417 2,703 Allowance for Loan Losses - Loans Individually Evaluated for Impairment 19 — — 22 41 March 31, 2020 Ending Loan Balance - Collectively Evaluated for Impairment $ 147,066 $ 524,993 $ 824,598 $ 915,301 $ 2,411,958 Allowance for Loan Losses - Loans Collectively Evaluated for Impairment 1,635 7,065 10,004 4,892 23,596 Ending Loan Balance - Individually Evaluated for Impairment 34 1,137 111 953 2,235 Allowance for Loan Losses - Loans Individually Evaluated for Impairment 4 — — 37 41 Through the provision for credit losses, an allowance for credit losses is maintained that reflects the best estimate of the calculated expected credit losses in the Company’s loan portfolio as of the balance sheet date. Additions are made to the allowance for credit losses through a periodic provision for credit losses. Actual credit losses are charged against the allowance for credit losses when loans are deemed uncollectible and recoveries of amounts previously charged off are recorded as credits to the allowance for credit losses. Arrow's 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 independent internal loan review department performs periodic reviews of the credit quality indicators on individual loans in the commercial loan portfolio. Management considers the need to qualitatively adjust expected credit loss estimates for information not already captured in the loss estimation process. These qualitative factor adjustments may increase or decrease management’s estimate of expected credit losses. Adjustments are not made for information that has already been considered and included in the loss estimation process. Management considers the qualitative factors that are relevant to Arrow as of the reporting date, which may include, but are not limited to the following factors: • The nature and volume of Arrow's financial assets; • The existence, growth, and effect of any concentrations of credit; • The volume and severity of past due loans, the volume of nonaccrual loans, and the volume and severity of adversely classified or graded loans; • The value of the underlying collateral for loans that are not collateral-dependent; • Arrow's lending policies and procedures, including changes in underwriting standards and practices for collections, write-offs, and recoveries; • The quality of Arrow's loan review function; • The experience, ability, and depth of Arrow's lending, investment, collection, and other relevant management/staff; • The effect of other external factors such as the regulatory, legal and technological environments; competition; and events such as natural disasters; • Actual and expected changes in international, national, regional, and local economic and business conditions and developments in which the institution operates that affect the collectability of financial assets; and • Other qualitative factors not reflected in quantitative loss rate calculations. Loan Credit Quality Indicators The following table presents credit quality indicators by total loans amortized cost basis by origination year as of March 31, 2021. Term Loans Amortized Cost Basis by Origination Year Revolving Loans Amortized Cost Basis Revolving Loan Converted to Term Total March 31, 2021 2021 2020 2019 2018 2017 Prior Commercial: Risk rating Satisfactory $ 78,184 $ 126,061 $ 18,202 $ 15,693 $ 10,004 $ 12,234 $ 14,006 $ — $ 274,384 Special mention — 5,031 66 — — 2 — — 5,099 Substandard — 5,507 — — — 3,514 47 — 9,068 Doubtful — — — — — — — — — Total Commercial Loans $ 78,184 $ 136,599 $ 18,268 $ 15,693 $ 10,004 $ 15,750 $ 14,053 $ — $ 288,551 Commercial Real Estate: Risk rating Satisfactory $ 24,511 $ 298,907 $ 49,957 $ 44,902 $ 24,558 $ 83,690 $ 3,161 $ — $ 529,686 Special mention — 17,825 2,010 — 142 2,115 — — 22,092 Substandard 2,021 10,853 4,006 163 — 12,661 25 — 29,729 Doubtful — — — — — — — — — Total Commercial Real Estate Loans $ 26,532 $ 327,585 $ 55,973 $ 45,065 $ 24,700 $ 98,466 $ 3,186 $ — $ 581,507 Consumer: Risk rating Performing $ 95,223 $ 321,575 $ 225,191 $ 135,646 $ 56,508 $ 25,834 $ 448 $ — $ 860,425 Nonperforming — 141 181 189 167 68 — — 746 Total Consumer Loans $ 95,223 $ 321,716 $ 225,372 $ 135,835 $ 56,675 $ 25,902 $ 448 $ — $ 861,171 Residential: Risk rating Performing $ 34,833 $ 156,500 $ 114,523 $ 107,176 $ 110,308 $ 266,377 $ 115,142 $ — $ 904,859 Nonperforming — 203 — 27 149 2,544 232 — 3,155 Total Residential Loans $ 34,833 $ 156,703 $ 114,523 $ 107,203 $ 110,457 $ 268,921 $ 115,374 $ — $ 908,014 For the purposes of the table above, nonperforming consumer and residential loans were those loans on nonaccrual status or are 90 days or more past due and still accruing interest. The recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process is $1.4 million. For the allowance calculation, an internally developed system of five credit quality indicators is used 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 Company 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 (e.g. 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. The following table presents information pertaining to loan credit quality indicators as of December 31, 2020 and March 31, 2020, as determined in accordance with ASC 310, prior to the adoption of ASU 2016-13: Loan Credit Quality Indicators Commercial Commercial Real Estate Consumer Residential Total December 31, 2020 Credit Risk Profile by Creditworthiness Category: Satisfactory $ 229,351 $ 525,609 $ 754,960 Special Mention 1,574 16,213 17,787 Substandard 9,629 29,965 39,594 Doubtful — — — Performing $ 858,298 $ 919,867 $ 1,778,165 Nonperforming 1,470 3,054 4,524 March 31, 2020 Credit Risk Profile by Creditworthiness Category: Satisfactory $ 140,218 $ 497,243 $ 637,461 Special Mention 28 255 283 Substandard 6,854 28,632 35,486 Doubtful — — — Credit Risk Profile Based on Payment Activity: Performing $ 823,901 $ 913,433 $ 1,737,334 Nonperforming 808 2,821 3,629 I mpaired Loans The following table presents information on impaired loans as of December 31, 2020 and March 31, 2020 based on whether the impaired loan has a recorded related allowance or has no recorded related allowance, as determined in accordance with ASC 310, prior to the adoption of ASU 2016-13: Impaired Loans Commercial Commercial Real Estate Consumer Residential Total December 31, 2020 Recorded Investment: With No Related Allowance $ — $ 1,124 $ 112 $ 1,174 $ 2,410 With a Related Allowance 46 — — 244 290 Unpaid Principal Balance: With No Related Allowance — 1,128 111 1,174 2,413 With a Related Allowance 47 — — 244 291 March 31, 2020 Recorded Investment: With No Related Allowance $ — $ 1,137 $ 112 $ 697 $ 1,946 With a Related Allowance 33 — — 256 289 Unpaid Principal Balance: With No Related Allowance — 1,137 111 697 $ 1,945 With a Related Allowance 34 — — 256 290 March 31, 2020 Average Recorded Balance: With No Related Allowance $ — $ 569 $ 110 $ 698 $ 1,377 With a Related Allowance 34 — — 258 292 Interest Income Recognized: With No Related Allowance — 10 — — 10 With a Related Allowance — — — — — Cash Basis Income: With No Related Allowance — — — — — With a Related Allowance — — — — — At December 31, 2020 and March 31, 2020, 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 loan became impaired and includes restructured loans in compliance with their modified terms and nonaccrual loans where interest income was recognized 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: March 31, 2021 Number of Loans — — — — — Pre-Modification Outstanding Recorded Investment $ — $ — $ — $ — $ — Post-Modification Outstanding Recorded Investment — — — — — Subsequent Default, Number of Contracts — — — — — Subsequent Default, Recorded Investment — — — — — March 31, 2020 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 — — — — — In general, prior to the novel coronavirus (COVID-19) pandemic, 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 March 31, 2021. The Consolidated Appropriations Act, 2021 extended certain provisions of the CARES Act including, if a short-term loan modification (e.g. six months) is made for a borrower as the result of the COVID-19 pandemic, and who was current on contractual payments as of December 31, 2019, this modification is not considered a TDR.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES (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 March 31, 2021, December 31, 2020 and March 31, 2020: Commitments to Extend Credit and Letters of Credit March 31, 2021 December 31, 2020 March 31, 2020 Notional Amount: Commitments to Extend Credit $ 437,920 $ 399,882 $ 376,519 Standby Letters of Credit 3,775 3,703 3,301 Fair Value: Commitments to Extend Credit $ — $ — $ — Standby Letters of Credit 12 28 29 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. Those 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 not expected to be fully 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 lines of credit 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 commercial 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 March 31, 2021, December 31, 2020 and March 31, 2020 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 will 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 range from 1% to 3% of the notional amount. Fees are collected upfront and amortized over the life of the commitment. The carrying amount and fair value of Arrow's standby letters of credit at March 31, 2021, December 31, 2020 and March 31, 2020, 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. Except as noted below, Arrow, including its subsidiary banks, is not currently the subject of any material pending legal proceedings, other than ordinary routine litigation occurring in the normal course of their business. On an ongoing basis, Arrow is often the subject of, or a party to, various legal claims by other parties against Arrow, by Arrow against other parties, or involving Arrow, which arise in the normal course of business. Except as noted below, the various pending legal claims against Arrow will not, in the opinion of management based upon consultation with counsel, result in any material liability. On July 1, 2020, Daphne Richard, a customer of GFNB filed a putative class action complaint against GFNB in the United States District Court for the Northern District of New York. The complaint alleges that GFNB assessed overdraft fees on certain transactions drawn on her checking account without having sufficiently disclosed its overdraft-fee practices in its account agreement. Ms. Richard, on behalf of two purported classes, seeks compensatory damages, disgorgement of profits, statutory damages, treble damages, enjoinment of the conduct complained of, and costs and fees. The complaint is similar to complaints filed against other financial institutions pertaining to overdraft fees. Arrow denies any wrongdoing and the case is being vigorously defended.

Comprehensive Income

Comprehensive Income	3 Months Ended
	Mar. 31, 2021
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 month periods ended March 31, 2021 and 2020: Schedule of Comprehensive Income Three Months Ended March 31 Tax Before-Tax (Expense) Net-of-Tax Amount Benefit Amount 2021 Net Unrealized Securities Holding Loss on Securities Available-for-Sale Arising During the Period $ (5,121) $ 1,309 $ (3,812) Net Unrealized Gain on Cash Flow Swap 1,982 (507) 1,475 Reclassification of Net Unrealized Gain on Cash Flow Hedge Agreements to Interest Expense (28) 8 (20) Amortization of Net Retirement Plan Actuarial Loss 46 (12) 34 Amortization of Net Retirement Plan Prior Service Cost 59 (16) 43 Other Comprehensive Loss $ (3,062) $ 782 $ (2,280) 2020 Net Unrealized Securities Holding Gain on Securities Available-for-Sale Arising During the Period $ 5,504 $ (1,406) $ 4,098 Net Unrealized Loss on Cash Flow Swap (294) 75 (219) Amortization of Net Retirement Plan Actuarial Loss 36 (9) 27 Amortization of Net Retirement Plan Prior Service Cost 54 (15) 39 Other Comprehensive Income $ 5,300 $ (1,355) $ 3,945 The following table presents the changes in accumulated other comprehensive income by component: Changes in Accumulated Other Comprehensive Income (Loss) by Component (1) Unrealized (Loss) and Gain on Available-for-Sale Securities Unrealized Gain (Loss) on Cash Flow Swap Defined Benefit Plan Items Total Net Actuarial Loss Net Prior Service Cost For the Quarter-To-Date periods ended: December 31, 2020 $ 5,799 $ 485 $ (5,929) $ (1,171) $ (816) Other comprehensive income or loss before reclassifications (3,812) 1,475 — — (2,337) Amounts reclassified from accumulated other comprehensive income — (20) 34 43 57 Net current-period other comprehensive income (3,812) 1,455 34 43 (2,280) March 31, 2021 $ 1,987 $ 1,940 $ (5,895) $ (1,128) $ (3,096) December 31, 2019 $ 465 $ — $ (5,847) $ (975) $ (6,357) Other comprehensive income or loss before reclassifications 4,098 (219) — — 3,879 Amounts reclassified from accumulated other comprehensive income — — 27 39 66 Net current-period other comprehensive income 4,098 (219) 27 39 3,945 March 31, 2020 $ 4,563 $ (219) $ (5,820) $ (936) $ (2,412) (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 Details about Accumulated Other Comprehensive Income (Loss) Components Amounts Reclassified from Accumulated Other Comprehensive Income Affected Line Item in the Statement Where Net Income Is Presented For the Quarter-to-date periods ended: March 31, 2021 Reclassification of Net Unrealized Gain on Cash Flow Hedge Agreements to Interest Expense $ 28 Interest expense Amortization of defined benefit pension items: Prior-service costs (59) (1) Salaries and Employee Benefits Actuarial loss (46) (1) Salaries and Employee Benefits (77) Total before Tax 20 Provision for Income Taxes Total reclassifications for the period $ (57) Net of Tax March 31, 2020 Amortization of defined benefit pension items: Prior-service costs $ (54) (1) Salaries and Employee Benefits Actuarial loss (36) (1) Salaries and Employee Benefits (90) Total before Tax 24 Provision for Income Taxes Total reclassifications for the period $ (66) 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	3 Months Ended
	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Stock-Based Compensation	STOCK-BASED COMPENSATION (Dollars In Thousands, Except Share and Per Share Amounts) Arrow has established three stock-based compensation plans: a 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 25, 2020 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 summarizes information about stock option activity for the year to date period ended March 31, 2021. Shares Weighted Average Exercise Price Outstanding at January 1, 2021 264,090 $ 28.84 Granted 55,500 29.55 Exercised (6,927) 22.52 Forfeited (1,034) 19.70 Outstanding at March 31, 2021 311,629 29.14 Vested at Period-End 179,681 27.73 Expected to Vest 131,948 31.05 Stock Options Granted Weighted Average Grant Date Information: Fair Value of Options Granted $ 4.85 Fair Value Assumptions: Dividend Yield 3.41 % Expected Volatility 26.53 % Risk Free Interest Rate 0.49 % Expected Lives (in years) 8.75 The following table presents information on the amounts expensed related to stock options for the three month periods ended March 31, 2021 and 2020: For the Three Months Ended March 31, 2021 2020 Amount expensed $ 72 $ 76 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 and are no longer forfeitable. Vested units settle upon retirement of the recipient. 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 summarizes information about restricted stock unit activity for the periods ended March 31, 2021 and 2020. Restricted Stock Units Weighted Average Grant Date Fair Value Non-vested at January 1, 2021 11,663 $ 31.62 Granted 4,738 29.40 Vested (3,582) 30.71 Non-vested at March 31, 2021 12,819 31.05 Non-vested at January 1, 2020 7,721 30.27 Granted 3,942 34.25 Non-vested at March 31, 2020 11,663 31.62 The following table presents information on the amounts expensed related to restricted stock units for the periods ended March 31, 2021 and 2020: For the Three Months Ended March 31, 2021 2020 Amount expensed $ 32 $ 27 Employee Stock Purchase Plan Arrow sponsors an ESPP under which employees may purchase Arrow's common stock at a discount below market price. The current amount of the discount is 5% . 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, pursuant to which substantially all employees of Arrow and its subsidiaries are eligible to participate upon satisfaction of applicable service requirements. The Company makes cash contributions to the ESOP each year.

Retirement Benefit Plans

Retirement Benefit Plans	3 Months Ended
	Mar. 31, 2021
Retirement Benefits [Abstract]
Retirement Benefit Plans	RETIREMENT BENEFIT PLANS (Dollars in Thousands) Arrow sponsors qualified and non-qualified 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 first 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 with a minimum interest credit of 3%. 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 The Employee Retirement Income Security Act (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 allows for grandfathered participants to receive automatic increases of Company contributions each year based on the increase in inflation, limited to a maximum of 5%. As of December 31, 2020, Arrow used the sex-distinct amount-weighted Pri-2012 mortality tables for employees, healthy annuitants and contingent survivors, adjusted for mortality improvements with the Scale MP-2020 mortality improvement scale on a generational basis for the Pension Plan and the sex-distinct amount-weighted White Collar tables for employees and healthy annuitants, adjusted for mortality improvements with the scale MP-2020 mortality improvement scale on a generational basis for the Select Executive Retirement Plan. As of December 31, 2020, Arrow updated its mortality assumption used for the Postretirement Plan to the sex-distinct Pri.H-2012 headcount-weighted mortality tables for employees and healthy annuitants, adjusted for mortality improvements with the Scale MP-2020 mortality improvement scale on a generational basis. The change in mortality tables resulted in a decrease in liabilities for the Employees' Pension Plan, the Select Executive Retirement Plan and the Postretirement Benefit Plan. The interest rates used in determining the present value of a lump sum payment/annuitizing cash balance accounts were changed to the segment rates in effect for the January 1, 2020 plan year (0.53%, 2.31%, 3.09%) as of December 31, 2020. Effective January 1, 2021, Glens Falls National Bank and Trust Company amended the Arrow Financial Corporation Employees' Pension Plan. The plan change was adopted January 1, 2021 and the amendment was valued as of December 31, 2020. The plan amendment is the following: Effective January 1, 2021, the benefit payable to or on behalf of each participant: • whose employment with the employer (or any predecessor employer, except as noted below) terminated on or before • who satisfied the requirements for early, normal, or late retirement as of such termination; • who never participated in the United Vermont Bancorporation Plan and; • who is, or whose beneficiary is, receiving monthly benefit payments from the Plan as of January 1, 2021 (including a The foregoing increase was applied to the monthly benefit actually payable to the Participant, or to the Participant's Beneficiary, as of January 1, 2021, determined after all applicable adjustments, regardless of whether such benefit had been determined under the Company's plan or the plan of a predecessor employer that had been merged into the Plan. The plan amendment caused a $351,638 increase in the projected benefit obligation creating a positive service cost which will be amortized over 9.70 years (the average expected future service of active plan participants.) Effective January 1, 2021, Glens Falls National Bank and Trust Company amended the Arrow Financial Corporation Employees' Select Executive Retirement Plan. The plan change was adopted January 1, 2021 and the amendment was valued as of December 31, 2020. The plan amendment provides a special adjustment to the monthly benefit payment for certain retirees. The plan amendment caused a $122,797 increase in the projected benefit obligation creating a positive prior service cost which will be amortized over 12.5 years. The following tables provide the components of net periodic benefit costs for the three month periods ended March 31, 2021 and 2020. Employees' Select Executive Postretirement Pension Retirement Benefit Plan Plan Plans Net Periodic (Benefit) Cost For the Three Months Ended March 31, 2021: Service Cost 1 $ 460 $ 118 $ 31 Interest Cost 2 340 45 67 Expected Return on Plan Assets 2 (950) — — Amortization of Prior Service Cost 2 20 12 27 Amortization of Net Loss 2 — 38 8 Net Periodic (Benefit) Cost $ (130) $ 213 $ 133 Plan Contributions During the Period $ — $ 118 $ 28 For the Three Months Ended March 31, 2020: Service Cost 1 $ 430 $ 103 $ 33 Interest Cost 2 417 54 78 Expected Return on Plan Assets 2 (904) — — Amortization of Prior Service Cost 2 16 11 27 Amortization of Net Loss 2 1 33 2 Net Periodic (Benefit) Cost $ (40) $ 201 $ 140 Plan Contributions During the Period $ — $ 117 $ 78 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

Earnings Per Common Share	3 Months Ended
	Mar. 31, 2021
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 March 31, 2021 and 2020. All share and per share amounts have been adjusted for the September 25, 2020, 3% stock dividend. Earnings Per Share Three Months Ended March 31, 2021 March 31, 2020 Earnings Per Share - Basic: Net Income $ 13,280 $ 8,127 Weighted Average Shares - Basic 15,528 15,446 Earnings Per Share - Basic $ 0.86 $ 0.53 Earnings Per Share - Diluted: Net Income $ 13,280 $ 8,127 Weighted Average Shares - Basic 15,528 15,446 Dilutive Average Shares Attributable to Stock Options 35 30 Weighted Average Shares - Diluted 15,563 15,476 Earnings Per Share - Diluted $ 0.85 $ 0.53

Fair Values

Fair Values	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Fair Values	FAIR VALUES (Dollars 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. There are no 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 March 31, 2021, December 31, 2020 and March 31, 2020 were securities available-for-sale, equity securities and derivatives. 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 Significant Other Significant Unobservable Inputs Fair Value of Assets and Liabilities Measured on a Recurring Basis: March 31, 2021 Assets: Securities Available-for Sale: U.S. Government & Agency Obligations $ 108,370 $ — $ 108,370 $ — State and Municipal Obligations 508 — 508 — Mortgage-Backed Securities 354,411 — 354,411 — Corporate and Other Debt Securities 800 — 800 — Total Securities Available-for-Sale 464,089 — 464,089 — Equity Securities 1,796 — 1,796 — Total Securities Measured on a Recurring Basis 465,885 — 465,885 — Derivatives, included in other assets 2,298 — 2,298 — Total Measured on a Recurring Basis $ 468,183 $ — $ 468,183 $ — Liabilities: Derivatives, included in other liabilities 2,298 — 2,298 — Total Measured on a Recurring Basis $ 2,298 $ — $ 2,298 $ — December 31, 2020 Assets: Securities Available-for Sale: U.S. Government & Agency Obligations $ 65,112 $ — $ 65,112 $ — State and Municipal Obligations 528 — 528 — Mortgage-Backed Securities 298,847 — 298,847 — Corporate and Other Debt Securities 800 — 800 — Total Securities Available-for-Sale 365,287 — 365,287 — Equity Securities 1,636 — 1,636 — Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis Fair Value Measurements at Reporting Date Using: Fair Value Quoted Prices Significant Other Significant Unobservable Inputs Total Securities Measured on a Recurring Basis 366,923 — 366,923 — Derivatives, included in other liabilities 5,080 — 5,080 — Total Measured on a Recurring Basis $ 372,003 $ — $ 372,003 $ — Liabilities: Derivatives, included in other liabilities 5,080 — 5,080 — Total Measured on a Recurring Basis $ 5,080 $ — $ 5,080 $ — March 31, 2020 Assets: Securities Available-for Sale: U.S. Government & Agency Obligations $ 5,181 $ — $ 5,181 $ — State and Municipal Obligations 723 — 723 — Mortgage-Backed Securities 371,482 — 371,482 — Corporate and Other Debt Securities 800 — 800 — Total Securities Available-for-Sale 378,186 — 378,186 — Equity Securities 1,689 — 1,689 — Total Securities Measured on a Recurring Basis $ 379,875 $ — $ 379,875 $ — Derivatives, included in other assets 5,191 $ — 5,191 — Total Measured on a Recurring Basis $ 385,066 $ — $ 385,066 $ — Liabilities: Derivatives, included in other liabilities 5,191 — 5,191 — Total Measured on a Recurring Basis $ 5,191 $ — $ 5,191 $ — Fair Value Quoted Prices Significant Other Significant Unobservable Inputs Losses Recognized in Earnings Fair Value of Assets and Liabilities Measured on a Nonrecurring Basis: March 31, 2021 Collateral Dependent Evaluated Loans $ 2,423 $ — $ — $ 2,423 Other Real Estate Owned and Repossessed Assets, Net 242 — — 242 — December 31, 2020 Collateral Dependent Impaired Loans $ 594 $ — $ — $ 594 Other Real Estate Owned and Repossessed Assets, Net 155 — — 155 — March 31, 2020 Collateral Dependent Impaired Loans $ 582 $ — $ — $ 582 Other Real Estate Owned and Repossessed Assets, Net 942 — — 942 — The fair value of financial instruments is determined 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). 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. The fair value of Level 2 derivatives is determined using inputs that are observable in the market place obtained from third parties including yield curves, publicly available volatilities, and floating indexes. Fair Value Methodology for Assets and Liabilities Measured on a Nonrecurring Basis The fair value of collateral dependent evaluated 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 at least annually, with no impairment recognized for these assets at March 31, 2021, December 31, 2020 and March 31, 2020. 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 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 each loan type. Then a credit loss component is determined utilizing the credit loss assumptions used in the allowance for credit 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. 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 calculated by the FHLBNY. The carrying amount of FHLBNY and FRB stock approximates fair value. If the stock was redeemed, the Company will receive an amount equal to the par value of the stock. 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 Carrying Value Fair Value Level 1 Level 2 Level 3 March 31, 2021 Cash and Cash Equivalents $ 452,207 $ 452,207 $ 452,207 $ — $ — Securities Available-for-Sale 464,089 464,089 — 464,089 — Securities Held-to-Maturity 214,561 221,360 — 221,360 — Equity Securities 1,796 1,796 — 1,796 — Federal Home Loan Bank and Federal 5,360 5,360 — 5,360 — Net Loans 2,612,403 2,603,225 — — 2,603,225 Accrued Interest Receivable 8,258 8,258 — 8,258 — Derivatives, included in other assets 2,298 2,298 2,298 Deposits 3,453,588 3,452,595 — 3,452,595 — Federal Funds Purchased and Securities 6,795 6,795 — 6,795 — Federal Home Loan Bank Term Advances 45,000 46,176 — 46,176 — Junior Subordinated Obligations Issued 20,000 20,000 — 20,000 — Accrued Interest Payable 237 237 — 237 — Derivatives, included in other liabilities 2,298 2,298 — 2,298 — Schedule of Fair Values by Balance Sheet Grouping Fair Value Hierarchy Carrying Value Fair Value Level 1 Level 2 Level 3 December 31, 2020 Cash and Cash Equivalents $ 380,991 $ 380,991 $ 380,991 $ — $ — Securities Available-for-Sale 365,287 365,287 — 365,287 — Securities Held-to-Maturity 218,405 226,576 — 226,576 — Equity Securities 1,636 1,636 — 1,636 Federal Home Loan Bank and Federal 5,349 5,349 — 5,349 — Net Loans 2,565,798 2,558,903 — — 2,558,903 Accrued Interest Receivable 7,495 7,495 — 7,495 — Derivatives, included in other assets 5,080 5,080 — 5,080 — Deposits 3,234,726 3,234,387 — 3,234,387 — Federal Funds Purchased and Securities 17,486 17,486 — 17,486 — Federal Home Loan Bank Term Advances 45,000 46,474 — 46,474 — Junior Subordinated Obligations Issued 20,000 20,000 — 20,000 — Accrued Interest Payable 326 326 — 326 — Derivatives, included in other liabilities 5,080 5,080 — 5,080 — March 31, 2020 Cash and Cash Equivalents $ 138,529 $ 138,529 $ 138,529 $ — $ — Securities Available-for-Sale 378,186 378,186 — 378,186 — Securities Held-to-Maturity 238,520 242,804 — 242,804 — Equity Securities 1,689 1,689 — 1,689 Federal Home Loan Bank and Federal 5,379 5,379 — 5,379 — Net Loans 2,390,556 2,368,033 — — 2,368,033 Accrued Interest Receivable 7,856 7,856 — 7,856 — Derivatives, included in other assets 5,191 5,191 — 5,191 — Deposits 2,811,005 2,811,668 — 2,811,668 — Federal Funds Purchased and Securities 57,909 57,909 — 57,909 — Federal Home Loan Bank Term Advances 50,000 51,194 — 51,194 — Junior Subordinated Obligations Issued 20,000 20,000 — 20,000 — Accrued Interest Payable 1,392 1,392 — 1,392 — Derivatives, included in other liabilities 5,191 5,191 — 5,191 —

Leases

Leases	3 Months Ended
	Mar. 31, 2021
Leases [Abstract]
Leases	LEASES (Dollars In Thousands) The Company is a lessee in its leases, which are mainly for financial services locations in addition to leases for corporate vehicles. These leases generally require the Company to pay third-party expenses on behalf of the Lessor, which are referred to as variable payments. Under some leases, the Company pays the variable payments to the lessor, and in other leases, the Company pays the variable payments directly to the applicable third party. None of the Company's current leases include any residual value guarantees or any subleases, and there are no significant rights and obligations of the Company for leases that have not commenced as of the reporting date. Arrow leases four of its branch offices, at market rates, from Stewart’s Shops Corp. Mr. Gary C. Dake, President of Stewart’s Shops Corp., serves as a director on the board of directors of each of Arrow and Saratoga National Bank and Trust Company. The following includes quantitative data related to the Company's leases as of and for the three months ended March 31, 2021 and March 31, 2020: Three Months Ended Finance Lease Amounts: Classification March 31, 2021 March 31, 2020 Right-of-Use Assets Premises and Equipment, Net $ 4,947 $ 5,124 Lease Liabilities Finance Leases 5,205 5,249 Operating Lease Amounts: Right-of-Use Assets Other Assets $ 5,435 $ 5,529 Lease Liabilities Other Liabilities 5,522 5,602 Other Information: Cash Paid For Amounts Included In The Measurement Of Lease Liabilities: Operating Outgoing Cash Flows From Finance Leases $ 49 $ 50 Operating Outgoing Cash Flows From Operating Leases 261 158 Financing Outgoing Cash Flows From Finance Leases 12 5 Right-of-Use Assets Obtained In Exchange For New Finance Lease Liabilities — — Right-of-Use Assets Obtained In Exchange For New Operating Lease Liabilities 331 — Weighted-average Remaining Lease Term - Finance Leases (Yrs.) 28.9 29.9 Weighted-average Remaining Lease Term - Operating Leases (Yrs.) 12.5 13.7 Weighted-average Discount Rate—Finance Leases 3.75 % 3.75 % Weighted-average Discount Rate—Operating Leases 3.13 % 3.36 % Lease cost information for the Company's leases is as follows: Three Months Ended March 31, 2021 March 31, 2020 Lease Cost: Finance Lease Cost: Reduction of Right-of-Use Assets $ 44 $ 44 Interest on Lease Liabilities 49 50 Operating Lease Cost 209 207 Short-term Lease Cost 5 7 Variable Lease Cost 104 55 Total Lease Cost $ 411 $ 363 Future Lease Payments at March 31, 2021 are as follows: Operating Leases Financing Leases Twelve Months Ended: 3/31/2022 $ 799 $ 243 3/31/2023 766 243 3/31/2024 641 243 3/31/2025 570 254 3/31/2026 526 265 Thereafter 3,516 7,733 Total Undiscounted Cash Flows $ 6,818 $ 8,981 Less: Net Present Value Adjustment 1,296 3,776 Lease Liability $ 5,522 $ 5,205
Leases	LEASES (Dollars In Thousands) The Company is a lessee in its leases, which are mainly for financial services locations in addition to leases for corporate vehicles. These leases generally require the Company to pay third-party expenses on behalf of the Lessor, which are referred to as variable payments. Under some leases, the Company pays the variable payments to the lessor, and in other leases, the Company pays the variable payments directly to the applicable third party. None of the Company's current leases include any residual value guarantees or any subleases, and there are no significant rights and obligations of the Company for leases that have not commenced as of the reporting date. Arrow leases four of its branch offices, at market rates, from Stewart’s Shops Corp. Mr. Gary C. Dake, President of Stewart’s Shops Corp., serves as a director on the board of directors of each of Arrow and Saratoga National Bank and Trust Company. The following includes quantitative data related to the Company's leases as of and for the three months ended March 31, 2021 and March 31, 2020: Three Months Ended Finance Lease Amounts: Classification March 31, 2021 March 31, 2020 Right-of-Use Assets Premises and Equipment, Net $ 4,947 $ 5,124 Lease Liabilities Finance Leases 5,205 5,249 Operating Lease Amounts: Right-of-Use Assets Other Assets $ 5,435 $ 5,529 Lease Liabilities Other Liabilities 5,522 5,602 Other Information: Cash Paid For Amounts Included In The Measurement Of Lease Liabilities: Operating Outgoing Cash Flows From Finance Leases $ 49 $ 50 Operating Outgoing Cash Flows From Operating Leases 261 158 Financing Outgoing Cash Flows From Finance Leases 12 5 Right-of-Use Assets Obtained In Exchange For New Finance Lease Liabilities — — Right-of-Use Assets Obtained In Exchange For New Operating Lease Liabilities 331 — Weighted-average Remaining Lease Term - Finance Leases (Yrs.) 28.9 29.9 Weighted-average Remaining Lease Term - Operating Leases (Yrs.) 12.5 13.7 Weighted-average Discount Rate—Finance Leases 3.75 % 3.75 % Weighted-average Discount Rate—Operating Leases 3.13 % 3.36 % Lease cost information for the Company's leases is as follows: Three Months Ended March 31, 2021 March 31, 2020 Lease Cost: Finance Lease Cost: Reduction of Right-of-Use Assets $ 44 $ 44 Interest on Lease Liabilities 49 50 Operating Lease Cost 209 207 Short-term Lease Cost 5 7 Variable Lease Cost 104 55 Total Lease Cost $ 411 $ 363 Future Lease Payments at March 31, 2021 are as follows: Operating Leases Financing Leases Twelve Months Ended: 3/31/2022 $ 799 $ 243 3/31/2023 766 243 3/31/2024 641 243 3/31/2025 570 254 3/31/2026 526 265 Thereafter 3,516 7,733 Total Undiscounted Cash Flows $ 6,818 $ 8,981 Less: Net Present Value Adjustment 1,296 3,776 Lease Liability $ 5,522 $ 5,205

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities	DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (In Thousands) Arrow is exposed to certain risks arising from both its business operations and economic conditions. Arrow principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. Arrow manages economic risks, including interest rate, primarily by managing the amount, sources and duration of its assets and liabilities and through the use of derivative instruments. Specifically, Arrow enters into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. Arrow's derivative financial instruments are used to manage differences in the amount, timing and duration of known or expected cash receipts and its known or expected cash payments principally related to certain fixed rate borrowings. Arrow also has interest rate derivatives that result from a service provided to certain qualifying customers and, therefore, are not used to manage interest rate risk in the Company’s assets or liabilities. The Company manages a matched book with respect to its derivative instruments in order to minimize its net risk exposure resulting from such transactions. Derivatives Not Designated as Hedging Instruments Arrow enters into interest rate swap agreements with its commercial customers to provide them with a long-term fixed rate, while simultaneously entering into offsetting interest rate swap agreements with a counterparty to swap the fixed rate to a variable rate to manage interest rate exposure. These interest rate swap agreements are not designated as a hedge for accounting purposes. As the interest rate swap agreements have substantially equivalent and offsetting terms, they do not present any material exposure to the Arrow's consolidated statements of income. Arrow records its interest rate swap agreements at fair value and is presented on a gross basis within other assets and other liabilities on the consolidated balance sheets. Changes in the fair value of assets and liabilities arising from these derivatives are included, net, in other income in the consolidated statement of income. The following table depicts the fair value adjustment recorded related to the notional amount of derivatives outstanding as well as the notional amount of the interest rate swap agreements. Derivatives Not Designated as Hedging Instruments - Interest Rate Swap Agreements March 31, 2021 December 31, 2020 March 31, 2020 Fair value adjustment included in other assets $ 2,298 $ 5,080 $ 5,191 Fair value adjustment included in other liabilities 2,298 5,080 5,191 Notional amount 175,113 176,637 121,559 Derivatives Designated as Hedging Instruments Arrow has entered into interest rate swaps to synthetically fix the variable rate interest payments associated with $20 million in outstanding subordinated trust securities. These agreements are designated as cash flow hedges. For derivatives designated and that qualify as cash flow hedges of interest rate risk, the gain or loss on the derivative is recorded in Accumulated Other Comprehensive Income ("AOCI") and subsequently reclassified into interest expense in the same period during which the hedge transaction affects earnings. Amounts reported in AOCI related to derivatives will be reclassified to interest expense as interest payments are made on Arrow's Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts borrowings. The following table indicates the effect of cash flow hedge accounting on AOCI and on the unaudited interim consolidated statement of income. Derivatives Designated as Hedging Instruments - Cash Flow Hedge Agreements March 31, 2021 December 31, 2020 March 31, 2020 Amount of gain (loss) recognized in AOCI $ 1,982 $ 651 $ (294) Amount of gain reclassified from AOCI interest expense 28 — —

COVID-19 Pandemic

COVID-19 Pandemic	3 Months Ended
	Mar. 31, 2021
Unusual or Infrequent Items, or Both [Abstract]
COVID-19 Pandemic	COVID-19 PANDEMICThe spread of COVID-19 and the resulting “shelter in place” and “stay at home” orders, travel restrictions and other precautions have caused significant disruptions in the United States economy, which could in turn disrupt the business, activities, and operations of Arrow’s customers, as well as Arrow's business and operations. The pandemic has also caused significant disruption in the financial markets both globally and in the United States. Arrow has taken steps to mitigate the risk of harm to its employees and customers and to its operations from the pandemic. In particular, Arrow, when necessary, has limited access to facilities to appointments only and encouraged customers to use contact-free alternatives like digital banking and ATMs. Arrow has also minimized contact for a large portion of its employee base through remote working, minimal travel and in-person meetings and social distancing.

Accounting Policies (Policies)

Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2021
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 (US GAAP) 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. Due to the uncertainty regarding the impact of the COVID-19 pandemic, management utilized estimates and assumptions in its evaluation of potential impairment of Arrow's right-of-use lease assets, goodwill and intangible assets. Our most significant estimate is the allowance for credit losses. Other estimates include the fair value of financial statements, evaluation of pension and other post-retirement liabilities, an analysis of a need for a valuation allowance for deferred tax assets and a reserve for unfunded loan commitments recorded as an other liability. 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 credit losses. In connection with the determination of the allowance for credit losses management obtains economic forecasts from reliable sources and appraisals for properties. The allowance for credit losses is management’s best estimate of the life of loan losses as of the balance sheet date. While management uses available information to recognize losses on loans, future adjustments to the allowance for credit losses may be necessary based on changes in economic conditions.
Allowance for Credit Losses	Allowance for Credit Losses – Loans Accounting Standards Update (“ASU”) 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“CECL”) approach requires an estimate of the credit losses expected over the life of a loan (or pool of loans). It replaces the incurred loss approach’s threshold that required the recognition of a credit loss when it was probable a loss event was incurred. The allowance for credit losses is a valuation account that is deducted from, or added to, the loans’ amortized cost basis to present the net, lifetime amount expected to be collected on the loans. Loan losses are charged off against the allowance when management believes a loan balance is confirmed to be uncollectible. Expected recoveries do not exceed the aggregate of amounts previously charged off and expected to be charged off. Management estimates the allowance balance using relevant available information from internal and external sources related to past events, current conditions, and a reasonable and supportable forecast. Historical credit loss experience provides the basis for the estimation of expected credit losses. Company historical loss experience was supplemented with peer information when there was insufficient loss data for the Company. Peer selection was based on a review of institutions with comparable loss experience as well as loan yield, bank size, portfolio concentration and geography. Adjustments to historical loss information are made for differences in current loan-specific risk characteristics such as differences in credit concentrations, delinquency level, collateral values and underwriting standards as well as changes in economic conditions or other relevant factors. Management judgment is required at each point in the measurement process. Portfolio segment is defined as the level at which an entity develops and documents a systematic methodology to determine its allowance for credit losses. Upon adoption of CECL, management revised the manner in which loans were pooled for similar risk characteristics. Management developed portfolio segments for estimating loss based on type of borrower and collateral as follows: Commercial Loans Commercial Real Estate Loans Consumer Loans Residential Loans Further details related to loan portfolio segments is included in Note 4 Loans. Historical credit loss experience for both the Company and segment-specific peers provides the basis for the estimation of expected credit losses. The Company utilized regression analyses of peer data, of which the Company is included, where observed credit losses and selected economic factors were utilized to determine suitable loss drivers for modeling lifetime probability of default ("PD") rates. Arrow uses the discounted cash flow ("DCF") method to estimate expected credit losses for the commercial, commercial real estate, and residential segments. For each of these loan segments, Arrow generates cash flow projections at the instrument level wherein payment expectations are adjusted for estimated prepayment speed, curtailments, time to recovery, PD, and segment-specific loss given default ("LGD") risk factors. The modeling of expected prepayment speeds, curtailment rates, and time to recovery are based on historical internal data and adjusted, if necessary, based on the reasonable and supportable forecast of economic conditions. For the loan segments utilizing the DCF method, (commercial, commercial real estate, and residential) management utilizes externally developed economic forecasts of the following economic factors as loss drivers: national unemployment, gross domestic product and home price index ("HPI"). The economic forecast is applied over a reasonable and supportable forecast period. Arrow utilizes a six quarter reasonable and supportable forecast period with a four quarter reversion to the historic mean on a straight-line basis. The combination of adjustments for credit expectations (default and loss) and timing expectations (prepayment, curtailment, and time to recovery) produces an expected cash flow stream at the instrument level. Instrument effective yield is calculated, net of the impacts of prepayment assumptions, and the instrument expected cash flows are then discounted at that effective yield to produce an instrument-level net present value of expected cash flows (“NPV”). An allowance for credit loss is established for the difference between the instrument’s NPV and amortized cost basis. The contractual term excludes expected extensions, renewals, and modifications unless either of the following applies: management has a reasonable expectation at the reporting date that a troubled debt restructuring (“TDR”) will be executed with an individual borrower or the extension or renewal options are included in the original or modified contract at the reporting date and are not unconditionally cancellable by Arrow. Arrow uses the vintage analysis method to estimate expected credit losses for the consumer loan segment. The vintage method was selected since the loans within the consumer loan segment are homogeneous, not just by risk characteristic, but loan structure. The loss rate is applied to the loan origination amounts. Arrow maintains, over the life of the loan, the loss curve by vintage year. If estimated losses computed by the vintage method need to be adjusted based on current conditions and the reasonable and supportable economic forecast, these adjustments may be incorporated over a six quarter reasonable and supportable forecast period, reverting to historical losses using a straight-line method over a two year period. The vintage and DCF models also consider the need to qualitatively adjust expected loss estimates for information not already captured in the quantitative loss estimation process. Qualitative considerations include limitations inherent in the quantitative model; trends experienced in nonperforming and delinquent loans; changes in value of underlying collateral; changes in lending policies and procedures; nature and composition of loans; portfolio concentrations that may affect loss experience across one or more components or the portfolio; the experience, ability and depth of lending management and staff; the Company’s credit review system; and the effect of external factors; such as competition, legal and regulatory requirements. These qualitative factor adjustments may increase or decrease the Company's estimate of expected credit losses so that the allowance for credit loss is reflective of the estimate of lifetime losses that exist in the loan portfolio at the balance sheet date. All loans not included in the vintage analysis method that exceed $250,000 which are on nonaccrual, are evaluated on an individual basis. For collateral dependent financial assets where Arrow has determined that foreclosure of the collateral is probable, or where the borrower is experiencing financial difficulty and Arrow expects repayment of the financial asset to be provided substantially through the operation or sale of the collateral, Arrow has elected a practical expedient to measure the allowance for credit loss as the difference between the fair value of the collateral less cost to sell, and the amortized cost basis of the asset as of the measurement date. In the event where the repayment of a collateral dependent financial asset is expected to be provided substantially through the operating of the collateral, Arrow will use fair value of the collateral at the reporting date when recording the net carrying amount of the asset and determining the allowance for credit losses. When repayment is expected to be from the sale of the collateral, expected credit losses are calculated as the amount by which the amortized cost basis of the financial asset exceeds the fair value of the underlying collateral less estimated cost to sell. The allowance for credit losses may be zero if the fair value of the collateral at the measurement date exceeds the amortized cost basis of the financial asset. Except as set forth below, a loan that has been modified or renewed is considered a TDR when two conditions are met: • The borrower is experiencing financial difficulty, and • Concessions are made for the borrower's benefit that would not otherwise be considered for a borrower or transaction with similar credit risk characteristics. Arrow's allowance for credit losses reflects all effects of a TDR when an individual asset is specifically identified as a reasonably expected TDR. The Company has determined that a TDR is reasonably expected no later than the point it is determined that modification is the best course of action and it is at least reasonably possible that the troubled borrower will accept some form of concession to avoid a default. Reasonably expected TDRs and executed non-performing TDRs are evaluated individually to determine the required allowance for credit losses. TDRs performing in accordance with their modified contractual terms for a reasonable period of time may be included in Arrow's existing pools based on the underlying risk characteristics of the loan to measure the allowance for credit losses. In accordance with the Coronavirus Aid, Relief, and Economic Security (CARES) Act and ASC Subtopic 310-40, as extended by the Consolidated Appropriations Act, 2021, if a qualifying loan modification was made for a borrower as the result of the COVID-19 pandemic, this modification was not considered a TDR. Estimated Credit Losses on Off-Balance Sheet Credit Exposures Recognized as Other Liabilities The Company estimates expected credit losses over the contractual period in which the Company has exposure to credit risk via a contractual obligation to extend credit, unless that obligation is unconditionally cancellable by the Company. The allowance for credit losses on off-balance sheet credit exposures recognized in other liabilities, is adjusted as an expense in other noninterest expense. The estimate includes consideration of the likelihood that funding will occur and an estimate of expected credit losses on commitments expected to be funded over their estimated lives. Estimating credit losses on unfunded commitments requires the Bank to consider the following categories of off-balance sheet credit exposure: unfunded commitments to extend credit, unfunded lines of credit, and standby letters of credit. Each of these unfunded commitments is then analyzed for a probability of funding to calculate a probable funding amount. The life of loan loss factor by related portfolio segment from the loan allowance for credit loss calculation is then applied to the probable funding amount to calculate the estimated credit losses on off-balance sheet credit exposures recognized as other liabilities. Allowance for Credit Losses – Held to Maturity ("HTM") Debt Securities Arrow's HTM debt securities are also required to utilize the CECL approach to estimate expected credit losses. Management measures expected credit losses on HTM debt securities on a collective basis by major security types that share similar risk characteristics, such as financial asset type and collateral type adjusted for current conditions and reasonable and supportable forecasts. Management classifies the HTM portfolio into the following major security types: U.S. government agency or U.S. government sponsored mortgage-backed and collateralized mortgage obligations securities, and state and municipal debt securities. The mortgage-backed and collateralized mortgage obligations HTM securities are issued by U.S. government entities and agencies. These securities are either explicitly or implicitly guaranteed by the U.S. government as to timely repayment of principal and interest, are highly rated by major rating agencies, and have a long history of no credit losses. Therefore, the Company did not record a credit loss for these securities. State and municipal bonds carry an investment grade from an accredited ratings agency, primarily with an investment grade rating. In addition, the Company has a limited amount of New York state local municipal bonds that are not rated. The estimate of expected credit losses on the HTM portfolio is based on the expected cash flows of each individual CUSIP over its contractual life and utilized a municipal loss forecast model for determining PD and LGD rates. Management may exercise discretion to make adjustments based on environmental factors. A calculated expected credit loss for individual securities was determined using the PD and LGD rates. Arrow determined that the expected credit loss on its municipal bond portfolio was de minimis, and therefore, an allowance for credit losses was not recorded. Allowance for Credit Losses – Available for Sale ("AFS") Debt Securities The impairment model for AFS debt securities differs from the CECL approach utilized by HTM debt securities since AFS debt securities are measured at fair value rather than amortized cost. For AFS debt securities in an unrealized loss position, the Bank first assesses whether it intends to sell, or it is more likely than not that it will be required to sell the security before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the security’s amortized cost basis is written down to fair value through income. For AFS debt securities that do not meet the aforementioned criteria, in making this assessment, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, adverse conditions specifically related to the security, failure of the issuer of the debt security to make scheduled interest or principal payments, among other factors. If this assessment indicates that a credit loss exists, the present value of cash flows expected to be collected from the security are compared to the amortized cost basis of the security. The cash flows are estimated using information relevant to the collectability of the security, including information about past events, current conditions and reasonable and supportable forecasts. If the present value of cash flows expected to be collected is less than the amortized cost basis, a credit loss exists and an allowance for credit losses is recorded for the credit loss, limited by the amount that the fair value is less than the amortized cost basis. Any impairment that has not been recorded through an allowance for credit losses is recognized in other comprehensive income. Accrued Interest Receivable Upon adoption of CECL on January 1, 2021, the Company made the following elections regarding accrued interest receivable: (1) presented accrued interest receivable balances separately within the other assets balance sheet line item; (2) excluded interest receivable that is included in amortized cost of financing receivables from related disclosures requirements and (3) continued the Company's policy to write off accrued interest receivable by reversing interest income. For loans, write off typically occurs upon becoming over 90 to 120 days past due and therefore the amount of such write offs are immaterial. Historically, the Company has not experienced uncollectible accrued interest receivable on investment securities.
New Accounting Pronouncements	The following accounting standards have been adopted in the first three months of 2021: In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments and all related subsequent amendments thereto. ASU 2016-13 introduces new guidance that make substantive changes to the accounting for credit losses. ASU 2016-13 introduces the CECL model, which applies to financial assets subject to credit losses and measured at amortized cost, as well as certain off-balance sheet credit exposures. This includes loans, loan commitments, standby letters of credit, net investments in leases recognized by a lessor and HTM debt securities. The CECL model requires an entity to estimate credit losses expected over the life of an exposure, considering information about historical events, current conditions and reasonable and supportable forecasts and is generally expected to result in earlier recognition of credit losses. ASU 2016-13 also modifies certain provisions of the current other-than-temporary impairment model for AFS debt securities. Credit losses on AFS debt securities will be limited to the difference between the security’s amortized cost basis and its fair value and will be recognized through an allowance for credit losses rather than as a direct reduction in amortized cost basis. ASU 2016-13 also provides for a simplified accounting model for purchased financial assets with more than insignificant credit deterioration since their origination. ASU 2016-13 requires expanded disclosures including, but not limited to, (1) information about the methods and assumptions used to estimate expected credit losses, including changes in the factors that influenced management’s estimate and the reasons for those changes, (2) financing receivables and net investment in leases measured at amortized cost, further disaggregation of information about the credit quality of those assets and (3) a rollforward of the allowance for credit losses for HTM and AFS securities. The standard also changes the accounting for purchased credit-impaired debt securities and loans. ASU 2016-13 was effective for the Company on January 1, 2020. As permitted by the CARES Act, Arrow deferred the adoption of the CECL methodology in determining credit losses until January 1, 2021. Management expects that the CECL model may create more volatility in the level of our allowance for loan losses from quarter to quarter as changes in the level of allowance for loan losses will be dependent upon, among other things, macroeconomic forecasts and conditions, loan portfolio volumes and credit quality. Arrow adopted CECL on January 1, 2021 (“Day 1”) using the modified retrospective method for all financial assets measured at amortized cost and off-balance-sheet credit exposures recognized as other liabilities. Results for reporting periods beginning after January 1, 2021 are presented under ASC 326 while prior period amounts continue to be reported in accordance with previously applicable GAAP. The Company recorded a net increase to retained earnings of $120,000 as of January 1, 2021 for the cumulative effect of adopting ASC 326. The transition adjustment includes a $1.3 million decrease to the allowance for credit losses on loans, a $1.1 million increase to the estimated credit losses on off-balance sheet credit exposures recorded as other liabilities, and a $41,000 impact to the deferred tax liability. The Company did not record an allowance for HTM debt securities on January 1, 2021 as the amount of credit risk was deemed immaterial. The Company did not record an allowance for credit losses on its AFS debt securities under the newly codified AFS debt security impairment model, as the majority of these securities are government agency-backed securities for which the risk of loss is minimal. Refer to Note 3 Investment Securities and Note 4 Loans (under the captions "Allowance for Credit Losses" and "Loan Credit Quality Indicators") to the Company’s unaudited interim consolidated financial statements included in this Form 10-Q for more information. In December 2019, the FASB issued ASU 2019-12 "Simplifying the Accounting for Income Taxes" (Topic 740), which removes certain exceptions to the general principles in Topic 740 and improves consistent application of and simplifies GAAP for other areas of Topic 740 by clarifying and amending existing guidance. This ASU is effective for fiscal years beginning after December 15, 2020 and interim periods within those fiscal years, with early adoption permitted. Arrow adopted this standard on January 1, 2021. The Company does not expect that the adoption of this standard will have a material impact on its financial position or the results of operations in periods subsequent to its adoption.

Cash and Cash Equivalents (Tabl

Cash and Cash Equivalents (Tables)	3 Months Ended
	Mar. 31, 2021
Cash and Cash Equivalents [Abstract]
Schedule of Cash and Cash Equivalents	The following table is the schedule of Cash and Cash Equivalents at March 31, 2021, December 31, 2020 and March 31, 2020. March 31, 2021 December 31, 2020 March 31, 2020 Cash and Due From Banks $ 45,602 $ 42,116 $ 32,525 Interest-Bearing Deposits at Banks 406,605 338,875 106,004 Total Cash and Cash Equivalents $ 452,207 380,991 138,529 Supplemental Information: Total required reserves, including vault cash and Federal Reserve Bank deposits 1 $ — $ — $ — Restricted cash pledged as collateral related to swap agreements and included in Cash and Due From Banks $ — $ 500 $ — 1. Until March 2020, Arrow was required to maintain reserve balances with the Federal Reserve Bank of New York. In March 2020, the Federal Reserve Board reduced reserve requirement ratios to zero percent to free up liquidity in the banking industry to support lending to households and businesses.
Restrictions on Cash and Cash Equivalents	The following table is the schedule of Cash and Cash Equivalents at March 31, 2021, December 31, 2020 and March 31, 2020. March 31, 2021 December 31, 2020 March 31, 2020 Cash and Due From Banks $ 45,602 $ 42,116 $ 32,525 Interest-Bearing Deposits at Banks 406,605 338,875 106,004 Total Cash and Cash Equivalents $ 452,207 380,991 138,529 Supplemental Information: Total required reserves, including vault cash and Federal Reserve Bank deposits 1 $ — $ — $ — Restricted cash pledged as collateral related to swap agreements and included in Cash and Due From Banks $ — $ 500 $ — 1. Until March 2020, Arrow was required to maintain reserve balances with the Federal Reserve Bank of New York. In March 2020, the Federal Reserve Board reduced reserve requirement ratios to zero percent to free up liquidity in the banking industry to support lending to households and businesses.

Investment Securities (Tables)

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Debt Securities, Available-For-Sale	The following table is the schedule of Available-For-Sale Securities at March 31, 2021, December 31, 2020 and March 31, 2020: Available-For-Sale Securities U.S. Government & Agency State and Mortgage- Corporate Total March 31, 2021 Available-For-Sale Securities, $ 110,001 $ 508 $ 349,911 $ 1,000 $ 461,420 Gross Unrealized Gains 138 — 6,276 — 6,414 Gross Unrealized Losses (1,769) — (1,776) (200) (3,745) Available-For-Sale Securities, 108,370 508 354,411 800 464,089 Available-For-Sale Securities, 352,214 Maturities of Debt Securities, Within One Year $ — $ 68 $ 58 $ — $ 126 From 1 - 5 Years 65,001 40 289,741 — 354,782 From 5 - 10 Years 45,000 400 60,112 1,000 106,512 Over 10 Years — — — — — Maturities of Debt Securities, Within One Year $ — $ 68 $ 64 $ — $ 132 From 1 - 5 Years 63,774 40 295,370 — 359,184 From 5 - 10 Years 44,596 400 58,977 800 104,773 Over 10 Years — — — — — Securities in a Continuous Less than 12 Months $ 103,231 $ — $ 120,780 $ — $ 224,011 12 Months or Longer — — — 800 800 Total $ 103,231 $ — $ 120,780 $ 800 $ 224,811 Number of Securities in a 14 — 16 1 31 Unrealized Losses on Less than 12 Months $ 1,769 $ — $ 1,776 $ — $ 3,545 12 Months or Longer — — — 200 200 Total $ 1,769 $ — $ 1,776 $ 200 $ 3,745 Disaggregated Details: US Agency Obligations, $ 110,001 US Agency Obligations, 108,370 US Government Agency $ 11,582 US Government Agency 11,658 Government Sponsored Entity 338,329 Government Sponsored Entity 342,753 Available-For-Sale Securities U.S. Government & Agency State and Mortgage- Corporate Total December 31, 2020 Available-For-Sale Securities, $ 65,002 $ 528 $ 290,967 $ 1,000 $ 357,497 Gross Unrealized Gains 184 — 7,934 — 8,118 Gross Unrealized Losses (74) — (54) (200) (328) Available-For-Sale Securities, 65,112 528 298,847 800 365,287 Available-For-Sale Securities, 244,411 Securities in a Continuous Less than 12 Months $ 29,926 $ — $ — $ — $ 29,926 12 Months or Longer — — 4,882 800 5,682 Total $ 29,926 $ — $ 4,882 $ 800 $ 35,608 Number of Securities in a 4 — 1 1 6 Unrealized Losses on Less than 12 Months $ 74 $ — $ — $ — $ 74 12 Months or Longer — — 54 200 254 Total $ 74 $ — $ 54 $ 200 $ 328 Disaggregated Details: US Agency Obligations, $ 65,002 US Agency Obligations, 65,112 US Government Agency $ 12,696 US Government Agency 12,683 Government Sponsored Entity 278,271 Government Sponsored Entity 286,164 Available-For-Sale Securities U.S. Government & Agency State and Mortgage- Corporate Total March 31, 2020 Available-For-Sale Securities, $ 5,002 $ 723 $ 365,333 $ 1,000 $ 372,058 Gross Unrealized Gains 179 — 7,484 — 7,663 Gross Unrealized Losses — — (1,335) (200) (1,535) Available-For-Sale Securities, 5,181 723 371,482 800 378,186 Available-For-Sale Securities, 273,124 Securities in a Continuous Less than 12 Months $ — $ — $ 18,846 $ — $ 18,846 12 Months or Longer — — 59,262 800 60,062 Total $ — $ — $ 78,108 $ 800 $ 78,908 Number of Securities in a — — 27 1 28 Unrealized Losses on Securities Less than 12 Months $ — $ — $ 316 $ — $ 316 12 Months or Longer — — 1,019 200 1,219 Total $ — $ — $ 1,335 $ 200 $ 1,535 Disaggregated Details: US Agency Obligations, $ 5,002 US Agency Obligations, 5,181 US Government Agency $ 58,089 US Government Agency 57,091 Government Sponsored Entity 307,244 Government Sponsored Entity 314,391
Held-To-Maturity Securities	The following table is the schedule of Held-To-Maturity Securities at March 31, 2021, December 31, 2020 and March 31, 2020: Held-To-Maturity Securities State and Mortgage- Total March 31, 2021 Held-To-Maturity Securities, $ 191,202 $ 23,359 $ 214,561 Gross Unrealized Gains 5,843 956 6,799 Gross Unrealized Losses — — — Held-To-Maturity Securities, 197,045 24,315 221,360 Held-To-Maturity Securities, 207,595 Maturities of Debt Securities, Within One Year $ 16,513 $ 1,586 $ 18,099 From 1 - 5 Years 139,576 21,773 161,349 From 5 - 10 Years 34,110 — 34,110 Over 10 Years 1,003 — 1,003 Maturities of Debt Securities, Within One Year $ 16,580 $ 1,639 $ 18,219 From 1 - 5 Years 143,850 22,676 166,526 From 5 - 10 Years 35,599 — 35,599 Over 10 Years 1,016 — 1,016 Securities in a Continuous Less than 12 Months $ — $ — $ — 12 Months or Longer — — — Total $ — $ — $ — Number of Securities in a — — — Unrealized Losses on Securities Less than 12 Months $ — $ — $ — 12 Months or Longer — — — Total $ — $ — $ — Disaggregated Details: US Government Agency $ 8,310 US Government Agency 8,597 Government Sponsored Entity 15,049 Government Sponsored Entity 15,718 Held-To-Maturity Securities State and Mortgage- Total December 31, 2020 Held-To-Maturity Securities, $ 192,352 $ 26,053 $ 218,405 Gross Unrealized Gains 7,080 1,094 8,174 Gross Unrealized Losses (3) — (3) Held-To-Maturity Securities, 199,429 27,147 226,576 Held-To-Maturity Securities, 211,176 Securities in a Continuous Less than 12 Months $ 1,513 $ — $ 1,513 12 Months or Longer — — — Total $ 1,513 $ — $ 1,513 Number of Securities in a 4 — 4 Unrealized Losses on Less than 12 Months $ 3 $ — $ 3 12 Months or Longer — — — Total $ 3 $ — $ 3 Disaggregated Details: US Government Agency $ 9,440 US Government Agency 9,762 Government Sponsored Entity 16,613 Government Sponsored Entity 17,385 March 31, 2020 Held-To-Maturity Securities, $ 204,148 $ 34,372 $ 238,520 Gross Unrealized Gains 3,104 1,329 4,433 Gross Unrealized Losses (149) — (149) Held-To-Maturity Securities, 207,103 35,701 242,804 Held-To-Maturity Securities, 231,539 Securities in a Continuous Less than 12 Months $ 5,625 $ — $ 5,625 12 Months or Longer 1,867 — 1,867 Total $ 7,492 $ — $ 7,492 Number of Securities in a 16 — 16 Held-To-Maturity Securities State and Mortgage- Total Unrealized Losses on Less than 12 Months $ 16 $ — $ 16 12 Months or Longer 133 — 133 Total $ 149 $ — $ 149 Disaggregated Details: US Government Agency $ 1,594 US Government Agency 1,655 Government Sponsored Entity 32,778 Government Sponsored Entity 34,046
Debt Securities, Trading, and Equity Securities, FV-NI	The following table is the schedule of Equity Securities at March 31, 2021, December 31, 2020 and March 31, 2020: Equity Securities March 31, 2021 December 31, 2020 March 31, 2020 Equity Securities, at Fair Value $1,796 $1,636 $1,689
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 month period ended March 31, 2021 and 2020: Quarterly Period Ended: March 31, 2021 March 31, 2020 Net Gain (Loss) on Equity Securities $ 160 $ (374) Less: Net gain (loss) recognized during the reporting period on equity securities sold during the period — — Unrealized net gain (loss) recognized during the reporting period on equity securities still held at the reporting date $ 160 $ (374)

Loans (Tables)

Loans (Tables)	3 Months Ended
	Mar. 31, 2021
Receivables [Abstract]
Past Due Financing Receivables	The following two tables present loan balances outstanding as of March 31, 2021, and an analysis of the recorded investment in loans that are past due at these dates. Generally, Arrow considers a loan past due 30 or more days when the borrower is two payments past due. Loans held-for-sale of $4,443, $11,085 and $1,905 as of March 31, 2021, December 31, 2020 and March 31, 2020, respectively, are included in the residential real estate balances for current loans. Schedule of Past Due Loans by Loan Category Commercial Commercial Real Estate Consumer Residential Total March 31, 2021 Loans Past Due 30-59 Days $ 63 $ 143 $ 2,233 $ 2,097 $ 4,536 Loans Past Due 60-89 Days 34 2,723 822 156 3,735 Loans Past Due 90 or more Days 38 1,474 592 1,700 3,804 Total Loans Past Due 135 4,340 3,647 3,953 12,075 Current Loans 288,416 577,167 857,524 904,061 2,627,168 Total Loans $ 288,551 $ 581,507 $ 861,171 $ 908,014 $ 2,639,243 December 31, 2020 Loans Past Due 30-59 Days $ 102 $ — $ 4,976 $ 261 $ 5,339 Loans Past Due 60-89 Days 113 — 2,713 1,279 4,105 Loans Past Due 90 or more Days 78 1,658 1,379 1,224 4,339 Total Loans Past Due 293 1,658 9,068 2,764 13,783 Current Loans 240,261 570,129 850,700 920,157 2,581,247 Total Loans $ 240,554 $ 571,787 $ 859,768 $ 922,921 $ 2,595,030 March 31, 2020 Loans Past Due 30-59 Days $ 173 $ 461 $ 5,636 $ 1,630 $ 7,900 Loans Past Due 60-89 Days 70 110 1,451 212 1,843 Loans Past Due 90 or more Days 8 911 549 1,525 2,993 Total Loans Past Due 251 1,482 7,636 3,367 12,736 Current Loans 146,849 524,648 817,073 912,887 2,401,457 Total Loans $ 147,100 $ 526,130 $ 824,709 $ 916,254 $ 2,414,193 Schedule of Non Accrual Loans by Category Commercial March 31, 2021 Commercial Real Estate Consumer Residential Total Loans 90 or More Days Past Due $ — $ — $ — $ 242 $ 242 Nonaccrual Loans 64 4,364 746 2,913 8,087 Nonaccrual With No Allowance for Credit Loss 64 1,641 746 2,913 5,364 Interest Income on Nonaccrual Loans — 14 — — — December 31, 2020 Loans 90 or More Days Past Due $ — $ 184 $ — $ 44 $ 228 Nonaccrual Loans 78 1,475 1,470 3,010 6,033 March 31, 2020 Loans 90 or More Days Past Due $ 5 $ 238 $ 93 $ 101 $ 437 Nonaccrual Loans 63 1,445 715 2,720 4,943
Allowance for Credit Losses on Financing Receivables	The following tables present the amortized cost basis of collateral-dependent loans by class of loans as of March 31, 2021: March 31, 2021 Collateral Type -Residential Real Estate Collateral Type - Commercial Real Estate Total Loans Commercial $ — $ — $ — Commercial Real Estate — 3,851 3,851 Consumer — — — Residential 1,156 — 1,156 Total $ 1,156 $ 3,851 $ 5,007 The following table details activity in the allowance for credit losses on loans for the three months ended March 31, 2021 and March 31, 2020. Arrow adopted ASU 2016-13 on January 1, 2021. Results for the periods beginning after January 1, 2021 are presented under ASC 326 and prior periods continue to be reported in accordance with previously applicable US GAAP. Allowance for Credit Losses Commercial Commercial Real Estate Consumer Residential Total Rollforward of the Allowance for Credit Losses for the Quarterly Period: December 31, 2020 $ 2,173 $ 9,990 $ 11,562 $ 5,507 $ 29,232 Impact of ASU 2016-13 2,084 2,064 (9,383) 3,935 (1,300) Balance as of January 1, 2021 as adjusted for ASU 2016-13 4,257 12,054 2,179 9,442 27,932 Charge-offs (3) — (627) (3) (633) Recoveries — — 189 — 189 Provision 43 (110) 688 (1,269) (648) March 31, 2021 $ 4,297 $ 11,944 $ 2,429 $ 8,170 $ 26,840 Allowance for Loan Losses Commercial Commercial Real Estate Consumer Residential Total Rollforward of the Allowance for Loan Losses for the Quarterly Period: December 31, 2019 $ 1,386 $ 5,830 $ 9,408 $ 4,563 $ 21,187 Charge-offs (14) — (467) — $ (481) Recoveries — — 159 — $ 159 Provision 267 1,235 904 366 $ 2,772 March 31, 2020 $ 1,639 $ 7,065 $ 10,004 $ 4,929 $ 23,637 Allowance for Credit Losses - Collectively and Individually Evaluated Commercial Commercial Real Estate Consumer Residential Total March 31, 2021 Ending Loan Balance - Collectively Evaluated $ 288,551 $ 577,656 $ 861,171 $ 906,858 $ 2,634,236 Allowance for Credit Losses - Loans Collectively Evaluated 4,297 11,388 2,429 8,170 26,284 Ending Loan Balance - Individually Evaluated — 3,851 — 1,156 5,007 Allowance for Credit Losses - Loans Individually Evaluated — 556 — — 556 The following table presents information pertaining to the allowance for loan losses as of December 31, 2020 and March 31, 2020, as determined in accordance with ASC 310, prior to the adoption of ASU 2016-13: Allowance for Loan Losses - Collectively and Individually Evaluated for Impairment Commercial Commercial Real Estate Consumer Residential Total December 31, 2020 Ending Loan Balance - Collectively Evaluated for Impairment $ 240,507 $ 570,659 $ 859,657 $ 921,504 $ 2,592,327 Allowance for Loan Losses - Loans Collectively Evaluated for Impairment 2,154 9,990 11,562 5,485 $ 29,191 Ending Loan Balance - Individually Evaluated for Impairment 47 1,128 111 1,417 2,703 Allowance for Loan Losses - Loans Individually Evaluated for Impairment 19 — — 22 41 March 31, 2020 Ending Loan Balance - Collectively Evaluated for Impairment $ 147,066 $ 524,993 $ 824,598 $ 915,301 $ 2,411,958 Allowance for Loan Losses - Loans Collectively Evaluated for Impairment 1,635 7,065 10,004 4,892 23,596 Ending Loan Balance - Individually Evaluated for Impairment 34 1,137 111 953 2,235 Allowance for Loan Losses - Loans Individually Evaluated for Impairment 4 — — 37 41
Financing Receivable Credit Quality Indicators	The following table presents credit quality indicators by total loans amortized cost basis by origination year as of March 31, 2021. Term Loans Amortized Cost Basis by Origination Year Revolving Loans Amortized Cost Basis Revolving Loan Converted to Term Total March 31, 2021 2021 2020 2019 2018 2017 Prior Commercial: Risk rating Satisfactory $ 78,184 $ 126,061 $ 18,202 $ 15,693 $ 10,004 $ 12,234 $ 14,006 $ — $ 274,384 Special mention — 5,031 66 — — 2 — — 5,099 Substandard — 5,507 — — — 3,514 47 — 9,068 Doubtful — — — — — — — — — Total Commercial Loans $ 78,184 $ 136,599 $ 18,268 $ 15,693 $ 10,004 $ 15,750 $ 14,053 $ — $ 288,551 Commercial Real Estate: Risk rating Satisfactory $ 24,511 $ 298,907 $ 49,957 $ 44,902 $ 24,558 $ 83,690 $ 3,161 $ — $ 529,686 Special mention — 17,825 2,010 — 142 2,115 — — 22,092 Substandard 2,021 10,853 4,006 163 — 12,661 25 — 29,729 Doubtful — — — — — — — — — Total Commercial Real Estate Loans $ 26,532 $ 327,585 $ 55,973 $ 45,065 $ 24,700 $ 98,466 $ 3,186 $ — $ 581,507 Consumer: Risk rating Performing $ 95,223 $ 321,575 $ 225,191 $ 135,646 $ 56,508 $ 25,834 $ 448 $ — $ 860,425 Nonperforming — 141 181 189 167 68 — — 746 Total Consumer Loans $ 95,223 $ 321,716 $ 225,372 $ 135,835 $ 56,675 $ 25,902 $ 448 $ — $ 861,171 Residential: Risk rating Performing $ 34,833 $ 156,500 $ 114,523 $ 107,176 $ 110,308 $ 266,377 $ 115,142 $ — $ 904,859 Nonperforming — 203 — 27 149 2,544 232 — 3,155 Total Residential Loans $ 34,833 $ 156,703 $ 114,523 $ 107,203 $ 110,457 $ 268,921 $ 115,374 $ — $ 908,014 The following table presents information pertaining to loan credit quality indicators as of December 31, 2020 and March 31, 2020, as determined in accordance with ASC 310, prior to the adoption of ASU 2016-13: Loan Credit Quality Indicators Commercial Commercial Real Estate Consumer Residential Total December 31, 2020 Credit Risk Profile by Creditworthiness Category: Satisfactory $ 229,351 $ 525,609 $ 754,960 Special Mention 1,574 16,213 17,787 Substandard 9,629 29,965 39,594 Doubtful — — — Performing $ 858,298 $ 919,867 $ 1,778,165 Nonperforming 1,470 3,054 4,524 March 31, 2020 Credit Risk Profile by Creditworthiness Category: Satisfactory $ 140,218 $ 497,243 $ 637,461 Special Mention 28 255 283 Substandard 6,854 28,632 35,486 Doubtful — — — Credit Risk Profile Based on Payment Activity: Performing $ 823,901 $ 913,433 $ 1,737,334 Nonperforming 808 2,821 3,629
Impaired Financing Receivables	The following table presents information on impaired loans as of December 31, 2020 and March 31, 2020 based on whether the impaired loan has a recorded related allowance or has no recorded related allowance, as determined in accordance with ASC 310, prior to the adoption of ASU 2016-13: Impaired Loans Commercial Commercial Real Estate Consumer Residential Total December 31, 2020 Recorded Investment: With No Related Allowance $ — $ 1,124 $ 112 $ 1,174 $ 2,410 With a Related Allowance 46 — — 244 290 Unpaid Principal Balance: With No Related Allowance — 1,128 111 1,174 2,413 With a Related Allowance 47 — — 244 291 March 31, 2020 Recorded Investment: With No Related Allowance $ — $ 1,137 $ 112 $ 697 $ 1,946 With a Related Allowance 33 — — 256 289 Unpaid Principal Balance: With No Related Allowance — 1,137 111 697 $ 1,945 With a Related Allowance 34 — — 256 290 March 31, 2020 Average Recorded Balance: With No Related Allowance $ — $ 569 $ 110 $ 698 $ 1,377 With a Related Allowance 34 — — 258 292 Interest Income Recognized: With No Related Allowance — 10 — — 10 With a Related Allowance — — — — — 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: March 31, 2021 Number of Loans — — — — — Pre-Modification Outstanding Recorded Investment $ — $ — $ — $ — $ — Post-Modification Outstanding Recorded Investment — — — — — Subsequent Default, Number of Contracts — — — — — Subsequent Default, Recorded Investment — — — — — March 31, 2020 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 — — — — —

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [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 March 31, 2021, December 31, 2020 and March 31, 2020: Commitments to Extend Credit and Letters of Credit March 31, 2021 December 31, 2020 March 31, 2020 Notional Amount: Commitments to Extend Credit $ 437,920 $ 399,882 $ 376,519 Standby Letters of Credit 3,775 3,703 3,301 Fair Value: Commitments to Extend Credit $ — $ — $ — Standby Letters of Credit 12 28 29

Comprehensive Income (Tables)

Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2021
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 month periods ended March 31, 2021 and 2020: Schedule of Comprehensive Income Three Months Ended March 31 Tax Before-Tax (Expense) Net-of-Tax Amount Benefit Amount 2021 Net Unrealized Securities Holding Loss on Securities Available-for-Sale Arising During the Period $ (5,121) $ 1,309 $ (3,812) Net Unrealized Gain on Cash Flow Swap 1,982 (507) 1,475 Reclassification of Net Unrealized Gain on Cash Flow Hedge Agreements to Interest Expense (28) 8 (20) Amortization of Net Retirement Plan Actuarial Loss 46 (12) 34 Amortization of Net Retirement Plan Prior Service Cost 59 (16) 43 Other Comprehensive Loss $ (3,062) $ 782 $ (2,280) 2020 Net Unrealized Securities Holding Gain on Securities Available-for-Sale Arising During the Period $ 5,504 $ (1,406) $ 4,098 Net Unrealized Loss on Cash Flow Swap (294) 75 (219) Amortization of Net Retirement Plan Actuarial Loss 36 (9) 27 Amortization of Net Retirement Plan Prior Service Cost 54 (15) 39 Other Comprehensive Income $ 5,300 $ (1,355) $ 3,945
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 (Loss) and Gain on Available-for-Sale Securities Unrealized Gain (Loss) on Cash Flow Swap Defined Benefit Plan Items Total Net Actuarial Loss Net Prior Service Cost For the Quarter-To-Date periods ended: December 31, 2020 $ 5,799 $ 485 $ (5,929) $ (1,171) $ (816) Other comprehensive income or loss before reclassifications (3,812) 1,475 — — (2,337) Amounts reclassified from accumulated other comprehensive income — (20) 34 43 57 Net current-period other comprehensive income (3,812) 1,455 34 43 (2,280) March 31, 2021 $ 1,987 $ 1,940 $ (5,895) $ (1,128) $ (3,096) December 31, 2019 $ 465 $ — $ (5,847) $ (975) $ (6,357) Other comprehensive income or loss before reclassifications 4,098 (219) — — 3,879 Amounts reclassified from accumulated other comprehensive income — — 27 39 66 Net current-period other comprehensive income 4,098 (219) 27 39 3,945 March 31, 2020 $ 4,563 $ (219) $ (5,820) $ (936) $ (2,412)
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 Details about Accumulated Other Comprehensive Income (Loss) Components Amounts Reclassified from Accumulated Other Comprehensive Income Affected Line Item in the Statement Where Net Income Is Presented For the Quarter-to-date periods ended: March 31, 2021 Reclassification of Net Unrealized Gain on Cash Flow Hedge Agreements to Interest Expense $ 28 Interest expense Amortization of defined benefit pension items: Prior-service costs (59) (1) Salaries and Employee Benefits Actuarial loss (46) (1) Salaries and Employee Benefits (77) Total before Tax 20 Provision for Income Taxes Total reclassifications for the period $ (57) Net of Tax March 31, 2020 Amortization of defined benefit pension items: Prior-service costs $ (54) (1) Salaries and Employee Benefits Actuarial loss (36) (1) Salaries and Employee Benefits (90) Total before Tax 24 Provision for Income Taxes Total reclassifications for the period $ (66) 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)	3 Months Ended
	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	The following table summarizes information about stock option activity for the year to date period ended March 31, 2021. Shares Weighted Average Exercise Price Outstanding at January 1, 2021 264,090 $ 28.84 Granted 55,500 29.55 Exercised (6,927) 22.52 Forfeited (1,034) 19.70 Outstanding at March 31, 2021 311,629 29.14 Vested at Period-End 179,681 27.73 Expected to Vest 131,948 31.05 Stock Options Granted Weighted Average Grant Date Information: Fair Value of Options Granted $ 4.85 Fair Value Assumptions: Dividend Yield 3.41 % Expected Volatility 26.53 % Risk Free Interest Rate 0.49 % Expected Lives (in years) 8.75
Schedule of Stock Options Roll Forward	The following table summarizes information about stock option activity for the year to date period ended March 31, 2021. Shares Weighted Average Exercise Price Outstanding at January 1, 2021 264,090 $ 28.84 Granted 55,500 29.55 Exercised (6,927) 22.52 Forfeited (1,034) 19.70 Outstanding at March 31, 2021 311,629 29.14 Vested at Period-End 179,681 27.73 Expected to Vest 131,948 31.05 Stock Options Granted Weighted Average Grant Date Information: Fair Value of Options Granted $ 4.85 Fair Value Assumptions: Dividend Yield 3.41 % Expected Volatility 26.53 % Risk Free Interest Rate 0.49 % Expected Lives (in years) 8.75
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs	The following table presents information on the amounts expensed related to stock options for the three month periods ended March 31, 2021 and 2020: For the Three Months Ended March 31, 2021 2020 Amount expensed $ 72 $ 76 The following table presents information on the amounts expensed related to restricted stock units for the periods ended March 31, 2021 and 2020: For the Three Months Ended March 31, 2021 2020 Amount expensed $ 32 $ 27
Schedule of Nonvested Restricted Stock Units Activity	The following table summarizes information about restricted stock unit activity for the periods ended March 31, 2021 and 2020. Restricted Stock Units Weighted Average Grant Date Fair Value Non-vested at January 1, 2021 11,663 $ 31.62 Granted 4,738 29.40 Vested (3,582) 30.71 Non-vested at March 31, 2021 12,819 31.05 Non-vested at January 1, 2020 7,721 30.27 Granted 3,942 34.25 Non-vested at March 31, 2020 11,663 31.62

Retirement Benefit Plans (Table

Retirement Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2021
Retirement Benefits [Abstract]
Schedule of Defined Benefit Plans Disclosures	The following tables provide the components of net periodic benefit costs for the three month periods ended March 31, 2021 and 2020. Employees' Select Executive Postretirement Pension Retirement Benefit Plan Plan Plans Net Periodic (Benefit) Cost For the Three Months Ended March 31, 2021: Service Cost 1 $ 460 $ 118 $ 31 Interest Cost 2 340 45 67 Expected Return on Plan Assets 2 (950) — — Amortization of Prior Service Cost 2 20 12 27 Amortization of Net Loss 2 — 38 8 Net Periodic (Benefit) Cost $ (130) $ 213 $ 133 Plan Contributions During the Period $ — $ 118 $ 28 For the Three Months Ended March 31, 2020: Service Cost 1 $ 430 $ 103 $ 33 Interest Cost 2 417 54 78 Expected Return on Plan Assets 2 (904) — — Amortization of Prior Service Cost 2 16 11 27 Amortization of Net Loss 2 1 33 2 Net Periodic (Benefit) Cost $ (40) $ 201 $ 140 Plan Contributions During the Period $ — $ 117 $ 78 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)	3 Months Ended
	Mar. 31, 2021
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 March 31, 2021 and 2020. All share and per share amounts have been adjusted for the September 25, 2020, 3% stock dividend. Earnings Per Share Three Months Ended March 31, 2021 March 31, 2020 Earnings Per Share - Basic: Net Income $ 13,280 $ 8,127 Weighted Average Shares - Basic 15,528 15,446 Earnings Per Share - Basic $ 0.86 $ 0.53 Earnings Per Share - Diluted: Net Income $ 13,280 $ 8,127 Weighted Average Shares - Basic 15,528 15,446 Dilutive Average Shares Attributable to Stock Options 35 30 Weighted Average Shares - Diluted 15,563 15,476 Earnings Per Share - Diluted $ 0.85 $ 0.53

Fair Values (Tables)

Fair Values (Tables)	3 Months Ended
	Mar. 31, 2021
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 Significant Other Significant Unobservable Inputs Fair Value of Assets and Liabilities Measured on a Recurring Basis: March 31, 2021 Assets: Securities Available-for Sale: U.S. Government & Agency Obligations $ 108,370 $ — $ 108,370 $ — State and Municipal Obligations 508 — 508 — Mortgage-Backed Securities 354,411 — 354,411 — Corporate and Other Debt Securities 800 — 800 — Total Securities Available-for-Sale 464,089 — 464,089 — Equity Securities 1,796 — 1,796 — Total Securities Measured on a Recurring Basis 465,885 — 465,885 — Derivatives, included in other assets 2,298 — 2,298 — Total Measured on a Recurring Basis $ 468,183 $ — $ 468,183 $ — Liabilities: Derivatives, included in other liabilities 2,298 — 2,298 — Total Measured on a Recurring Basis $ 2,298 $ — $ 2,298 $ — December 31, 2020 Assets: Securities Available-for Sale: U.S. Government & Agency Obligations $ 65,112 $ — $ 65,112 $ — State and Municipal Obligations 528 — 528 — Mortgage-Backed Securities 298,847 — 298,847 — Corporate and Other Debt Securities 800 — 800 — Total Securities Available-for-Sale 365,287 — 365,287 — Equity Securities 1,636 — 1,636 — Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis Fair Value Measurements at Reporting Date Using: Fair Value Quoted Prices Significant Other Significant Unobservable Inputs Total Securities Measured on a Recurring Basis 366,923 — 366,923 — Derivatives, included in other liabilities 5,080 — 5,080 — Total Measured on a Recurring Basis $ 372,003 $ — $ 372,003 $ — Liabilities: Derivatives, included in other liabilities 5,080 — 5,080 — Total Measured on a Recurring Basis $ 5,080 $ — $ 5,080 $ — March 31, 2020 Assets: Securities Available-for Sale: U.S. Government & Agency Obligations $ 5,181 $ — $ 5,181 $ — State and Municipal Obligations 723 — 723 — Mortgage-Backed Securities 371,482 — 371,482 — Corporate and Other Debt Securities 800 — 800 — Total Securities Available-for-Sale 378,186 — 378,186 — Equity Securities 1,689 — 1,689 — Total Securities Measured on a Recurring Basis $ 379,875 $ — $ 379,875 $ — Derivatives, included in other assets 5,191 $ — 5,191 — Total Measured on a Recurring Basis $ 385,066 $ — $ 385,066 $ — Liabilities: Derivatives, included in other liabilities 5,191 — 5,191 — Total Measured on a Recurring Basis $ 5,191 $ — $ 5,191 $ — Fair Value Quoted Prices Significant Other Significant Unobservable Inputs Losses Recognized in Earnings Fair Value of Assets and Liabilities Measured on a Nonrecurring Basis: March 31, 2021 Collateral Dependent Evaluated Loans $ 2,423 $ — $ — $ 2,423 Other Real Estate Owned and Repossessed Assets, Net 242 — — 242 — December 31, 2020 Collateral Dependent Impaired Loans $ 594 $ — $ — $ 594 Other Real Estate Owned and Repossessed Assets, Net 155 — — 155 — March 31, 2020 Collateral Dependent Impaired Loans $ 582 $ — $ — $ 582 Other Real Estate Owned and Repossessed Assets, Net 942 — — 942 —
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 Carrying Value Fair Value Level 1 Level 2 Level 3 March 31, 2021 Cash and Cash Equivalents $ 452,207 $ 452,207 $ 452,207 $ — $ — Securities Available-for-Sale 464,089 464,089 — 464,089 — Securities Held-to-Maturity 214,561 221,360 — 221,360 — Equity Securities 1,796 1,796 — 1,796 — Federal Home Loan Bank and Federal 5,360 5,360 — 5,360 — Net Loans 2,612,403 2,603,225 — — 2,603,225 Accrued Interest Receivable 8,258 8,258 — 8,258 — Derivatives, included in other assets 2,298 2,298 2,298 Deposits 3,453,588 3,452,595 — 3,452,595 — Federal Funds Purchased and Securities 6,795 6,795 — 6,795 — Federal Home Loan Bank Term Advances 45,000 46,176 — 46,176 — Junior Subordinated Obligations Issued 20,000 20,000 — 20,000 — Accrued Interest Payable 237 237 — 237 — Derivatives, included in other liabilities 2,298 2,298 — 2,298 — Schedule of Fair Values by Balance Sheet Grouping Fair Value Hierarchy Carrying Value Fair Value Level 1 Level 2 Level 3 December 31, 2020 Cash and Cash Equivalents $ 380,991 $ 380,991 $ 380,991 $ — $ — Securities Available-for-Sale 365,287 365,287 — 365,287 — Securities Held-to-Maturity 218,405 226,576 — 226,576 — Equity Securities 1,636 1,636 — 1,636 Federal Home Loan Bank and Federal 5,349 5,349 — 5,349 — Net Loans 2,565,798 2,558,903 — — 2,558,903 Accrued Interest Receivable 7,495 7,495 — 7,495 — Derivatives, included in other assets 5,080 5,080 — 5,080 — Deposits 3,234,726 3,234,387 — 3,234,387 — Federal Funds Purchased and Securities 17,486 17,486 — 17,486 — Federal Home Loan Bank Term Advances 45,000 46,474 — 46,474 — Junior Subordinated Obligations Issued 20,000 20,000 — 20,000 — Accrued Interest Payable 326 326 — 326 — Derivatives, included in other liabilities 5,080 5,080 — 5,080 — March 31, 2020 Cash and Cash Equivalents $ 138,529 $ 138,529 $ 138,529 $ — $ — Securities Available-for-Sale 378,186 378,186 — 378,186 — Securities Held-to-Maturity 238,520 242,804 — 242,804 — Equity Securities 1,689 1,689 — 1,689 Federal Home Loan Bank and Federal 5,379 5,379 — 5,379 — Net Loans 2,390,556 2,368,033 — — 2,368,033 Accrued Interest Receivable 7,856 7,856 — 7,856 — Derivatives, included in other assets 5,191 5,191 — 5,191 — Deposits 2,811,005 2,811,668 — 2,811,668 — Federal Funds Purchased and Securities 57,909 57,909 — 57,909 — Federal Home Loan Bank Term Advances 50,000 51,194 — 51,194 — Junior Subordinated Obligations Issued 20,000 20,000 — 20,000 — Accrued Interest Payable 1,392 1,392 — 1,392 — Derivatives, included in other liabilities 5,191 5,191 — 5,191 —

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2021
Leases [Abstract]
Lease, Cost	The following includes quantitative data related to the Company's leases as of and for the three months ended March 31, 2021 and March 31, 2020: Three Months Ended Finance Lease Amounts: Classification March 31, 2021 March 31, 2020 Right-of-Use Assets Premises and Equipment, Net $ 4,947 $ 5,124 Lease Liabilities Finance Leases 5,205 5,249 Operating Lease Amounts: Right-of-Use Assets Other Assets $ 5,435 $ 5,529 Lease Liabilities Other Liabilities 5,522 5,602 Other Information: Cash Paid For Amounts Included In The Measurement Of Lease Liabilities: Operating Outgoing Cash Flows From Finance Leases $ 49 $ 50 Operating Outgoing Cash Flows From Operating Leases 261 158 Financing Outgoing Cash Flows From Finance Leases 12 5 Right-of-Use Assets Obtained In Exchange For New Finance Lease Liabilities — — Right-of-Use Assets Obtained In Exchange For New Operating Lease Liabilities 331 — Weighted-average Remaining Lease Term - Finance Leases (Yrs.) 28.9 29.9 Weighted-average Remaining Lease Term - Operating Leases (Yrs.) 12.5 13.7 Weighted-average Discount Rate—Finance Leases 3.75 % 3.75 % Weighted-average Discount Rate—Operating Leases 3.13 % 3.36 % Lease cost information for the Company's leases is as follows: Three Months Ended March 31, 2021 March 31, 2020 Lease Cost: Finance Lease Cost: Reduction of Right-of-Use Assets $ 44 $ 44 Interest on Lease Liabilities 49 50 Operating Lease Cost 209 207 Short-term Lease Cost 5 7 Variable Lease Cost 104 55 Total Lease Cost $ 411 $ 363
Lessee, Operating Lease, Liability, Maturity	Future Lease Payments at March 31, 2021 are as follows: Operating Leases Financing Leases Twelve Months Ended: 3/31/2022 $ 799 $ 243 3/31/2023 766 243 3/31/2024 641 243 3/31/2025 570 254 3/31/2026 526 265 Thereafter 3,516 7,733 Total Undiscounted Cash Flows $ 6,818 $ 8,981 Less: Net Present Value Adjustment 1,296 3,776 Lease Liability $ 5,522 $ 5,205
Finance Lease, Liability, Maturity	Future Lease Payments at March 31, 2021 are as follows: Operating Leases Financing Leases Twelve Months Ended: 3/31/2022 $ 799 $ 243 3/31/2023 766 243 3/31/2024 641 243 3/31/2025 570 254 3/31/2026 526 265 Thereafter 3,516 7,733 Total Undiscounted Cash Flows $ 6,818 $ 8,981 Less: Net Present Value Adjustment 1,296 3,776 Lease Liability $ 5,522 $ 5,205

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	The following table depicts the fair value adjustment recorded related to the notional amount of derivatives outstanding as well as the notional amount of the interest rate swap agreements. Derivatives Not Designated as Hedging Instruments - Interest Rate Swap Agreements March 31, 2021 December 31, 2020 March 31, 2020 Fair value adjustment included in other assets $ 2,298 $ 5,080 $ 5,191 Fair value adjustment included in other liabilities 2,298 5,080 5,191 Notional amount 175,113 176,637 121,559
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)	The following table indicates the effect of cash flow hedge accounting on AOCI and on the unaudited interim consolidated statement of income. Derivatives Designated as Hedging Instruments - Cash Flow Hedge Agreements March 31, 2021 December 31, 2020 March 31, 2020 Amount of gain (loss) recognized in AOCI $ 1,982 $ 651 $ (294) Amount of gain reclassified from AOCI interest expense 28 — —

Accounting Policies (Details)

Accounting Policies (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Jan. 01, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adoption	$ 342,413		$ 334,392	$ 309,398	$ 301,728
Finance receivable, allowance for credit losses	26,840		29,232	23,637	21,187
Off-balance sheet, credit loss, liability	993
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adoption	$ 51,263		41,899	$ 37,441	$ 33,218
Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Finance receivable, allowance for credit losses		$ (1,300)
Off-balance sheet, credit loss, liability		1,100
Deferred tax liabilities, net		41
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adoption			120
Finance receivable, allowance for credit losses			(1,300)
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adoption			$ 120
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adoption		$ 120

Cash and Cash Equivalents (Deta

Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Cash and Cash Equivalents [Abstract]
Cash and Due From Banks	$ 45,602	$ 42,116	$ 32,525
Interest-Bearing Deposits at Banks	406,605	338,875	106,004
Total Cash and Cash Equivalents	452,207	380,991	138,529	$ 70,221
Total required reserves, including vault cash and Federal Reserve Bank deposits	0	0	0
Restricted cash pledged as collateral related to swap agreements and included in Cash and Due From Banks	$ 0	$ 500	$ 0

Investment Securities - Availab

Investment Securities - Available for Sale (Details) $ in Thousands	Mar. 31, 2021USD ($)security	Dec. 31, 2020USD ($)security	Mar. 31, 2020USD ($)security
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	$ 461,420	$ 357,497	$ 372,058
Gross Unrealized Gains	6,414	8,118	7,663
Gross Unrealized Losses	(3,745)	(328)	(1,535)
Available-for-Sale at Fair Value	464,089	365,287	378,186
Maturities of Debt Securities, at Amortized Cost:
Within One Year	126
From 1 - 5 Years	354,782
From 5 - 10 Years	106,512
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	132
From 1 - 5 Years	359,184
From 5 - 10 Years	104,773
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	224,011	29,926	18,846
12 Months or Longer	800	5,682	60,062
Total	$ 224,811	$ 35,608	$ 78,908
Number of Securities in a Continuous Loss Position | security	31	6	28
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 3,545	$ 74	$ 316
12 Months or Longer	200	254	1,219
Total	3,745	328	1,535
Collateral Pledged
Available-For-Sale Securities
Available-For-Sale Securities, Pledged as Collateral, at Fair Value	352,214	244,411	273,124
U.S. Government & Agency Obligations
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	110,001	65,002	5,002
Gross Unrealized Gains	138	184	179
Gross Unrealized Losses	(1,769)	(74)	0
Available-for-Sale at Fair Value	108,370	65,112	5,181
Maturities of Debt Securities, at Amortized Cost:
Within One Year	0
From 1 - 5 Years	65,001
From 5 - 10 Years	45,000
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	0
From 1 - 5 Years	63,774
From 5 - 10 Years	44,596
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	103,231	29,926	0
12 Months or Longer	0	0	0
Total	$ 103,231	$ 29,926	$ 0
Number of Securities in a Continuous Loss Position | security	14	4	0
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 1,769	$ 74	$ 0
12 Months or Longer	0	0	0
Total	1,769	74	0
U.S. Government & Agency Obligations | Agency Securities
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	110,001	65,002	5,002
Available-for-Sale at Fair Value	108,370	65,112	5,181
State and Municipal Obligations
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	508	528	723
Gross Unrealized Gains	0	0	0
Gross Unrealized Losses	0	0	0
Available-for-Sale at Fair Value	508	528	723
Maturities of Debt Securities, at Amortized Cost:
Within One Year	68
From 1 - 5 Years	40
From 5 - 10 Years	400
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	68
From 1 - 5 Years	40
From 5 - 10 Years	400
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 | security	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
Mortgage- Backed Securities
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	349,911	290,967	365,333
Gross Unrealized Gains	6,276	7,934	7,484
Gross Unrealized Losses	(1,776)	(54)	(1,335)
Available-for-Sale at Fair Value	354,411	298,847	371,482
Maturities of Debt Securities, at Amortized Cost:
Within One Year	58
From 1 - 5 Years	289,741
From 5 - 10 Years	60,112
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	64
From 1 - 5 Years	295,370
From 5 - 10 Years	58,977
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	120,780	0	18,846
12 Months or Longer	0	4,882	59,262
Total	$ 120,780	$ 4,882	$ 78,108
Number of Securities in a Continuous Loss Position | security	16	1	27
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 1,776	$ 0	$ 316
12 Months or Longer	0	54	1,019
Total	1,776	54	1,335
Mortgage- Backed Securities | US Government Agencies Debt Securities
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	11,582	12,696	58,089
Available-for-Sale at Fair Value	11,658	12,683	57,091
Mortgage- Backed Securities | US Government-sponsored Enterprises Debt Securities
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	338,329	278,271	307,244
Available-for-Sale at Fair Value	342,753	286,164	314,391
Corporate and Other Debt Securities
Available-For-Sale Securities
Available-For-Sale Securities, at Amortized Cost	1,000	1,000	1,000
Gross Unrealized Gains	0	0	0
Gross Unrealized Losses	(200)	(200)	(200)
Available-for-Sale at Fair Value	800	800	800
Maturities of Debt Securities, at Amortized Cost:
Within One Year	0
From 1 - 5 Years	0
From 5 - 10 Years	1,000
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	0
From 1 - 5 Years	0
From 5 - 10 Years	800
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	0	0	0
12 Months or Longer	800	800	800
Total	$ 800	$ 800	$ 800
Number of Securities in a Continuous Loss Position | security	1	1	1
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0	$ 0	$ 0
12 Months or Longer	200	200	200
Total	$ 200	$ 200	$ 200

Investment Securities - Held to

Investment Securities - Held to Maturity (Details)	3 Months Ended
	Mar. 31, 2021USD ($)security	Dec. 31, 2020USD ($)security	Mar. 31, 2020USD ($)security
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	$ 214,561,000	$ 218,405,000	$ 238,520,000
Gross Unrealized Gains	6,799,000	8,174,000	4,433,000
Gross Unrealized Losses	0	(3,000)	(149,000)
Held-To-Maturity Securities, at Fair Value	221,360,000	226,576,000	242,804,000
Maturities of Debt Securities, at Amortized Cost:
Within One Year	18,099,000
From 1 - 5 Years	161,349,000
From 5 - 10 Years	34,110,000
Over 10 Years	1,003,000
Maturities of Debt Securities, at Fair Value:
Within One Year	18,219,000
From 1 - 5 Years	166,526,000
From 5 - 10 Years	35,599,000
Over 10 Years	1,016,000
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	0	1,513,000	5,625,000
12 Months or Longer	0	0	1,867,000
Total	$ 0	$ 1,513,000	$ 7,492,000
Number of Securities in a Continuous Loss Position | security	0	4	16
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0	$ 3,000	$ 16,000
12 Months or Longer	0	0	133,000
Total	0	3,000	149,000
Debt securities, available-for-sale, allowance for credit loss	0
Debt securities, available-for-sale, allowance for credit loss, not to sell before recovery, credit loss, previously recorded, expense (reversal)	0
Debt securities, held-to-maturity, allowance for credit loss	0
Equity Securities	1,796,000	1,636,000	1,689,000
State and Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	191,202,000	192,352,000	204,148,000
Gross Unrealized Gains	5,843,000	7,080,000	3,104,000
Gross Unrealized Losses	0	(3,000)	(149,000)
Held-To-Maturity Securities, at Fair Value	197,045,000	199,429,000	207,103,000
Maturities of Debt Securities, at Amortized Cost:
Within One Year	16,513,000
From 1 - 5 Years	139,576,000
From 5 - 10 Years	34,110,000
Over 10 Years	1,003,000
Maturities of Debt Securities, at Fair Value:
Within One Year	16,580,000
From 1 - 5 Years	143,850,000
From 5 - 10 Years	35,599,000
Over 10 Years	1,016,000
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	0	1,513,000	5,625,000
12 Months or Longer	0	0	1,867,000
Total	$ 0	$ 1,513,000	$ 7,492,000
Number of Securities in a Continuous Loss Position | security	0	4	16
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0	$ 3,000	$ 16,000
12 Months or Longer	0	0	133,000
Total	0	3,000	149,000
Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	23,359,000	26,053,000	34,372,000
Gross Unrealized Gains	956,000	1,094,000	1,329,000
Gross Unrealized Losses	0	0	0
Held-To-Maturity Securities, at Fair Value	24,315,000	27,147,000	35,701,000
Maturities of Debt Securities, at Amortized Cost:
Within One Year	1,586,000
From 1 - 5 Years	21,773,000
From 5 - 10 Years	0
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	1,639,000
From 1 - 5 Years	22,676,000
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 | security	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
Fair Value, Measurements, Recurring
Unrealized Losses on Securities in a Continuous Loss Position:
Equity Securities	1,796,000	1,636,000	1,689,000
Collateral Pledged
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, Pledged as Collateral, at Fair Value	207,595,000	211,176,000	231,539,000
US Government Agencies Debt Securities | Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	8,310,000	9,440,000	1,594,000
US Government Agencies Debt Securities | Fair Value, Measurements, Recurring | Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Fair Value	8,597,000	9,762,000	1,655,000
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	15,049,000	16,613,000	32,778,000
US Government-sponsored Enterprises Debt Securities | Fair Value, Measurements, Recurring | Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Fair Value	$ 15,718,000	$ 17,385,000	$ 34,046,000

Investment Securities - Unreali

Investment Securities - Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Net Gain (Loss) on Equity Securities	$ 160	$ (374)
Less: Net gain (loss) recognized during the reporting period on equity securities sold during the period	0	0
Unrealized net gain (loss) recognized during the reporting period on equity securities still held at the reporting date	$ 160	$ (374)

Loans - Loan Categories and Pas

Loans - Loan Categories and Past Due Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans receivable held-for-sale, net, not part of disposal group	$ 4,443	$ 11,085	$ 1,905
Recorded investment, past due	12,075	13,783	12,736
Current Loans	2,627,168	2,581,247	2,401,457
Total	2,639,243	2,595,030	2,414,193
Loans 90 or More Days Past Due and Still Accruing Interest	242	228	437
Nonaccrual Loans	8,087	6,033	4,943
Nonaccrual With No Allowance for Credit Loss	5,364
Interest Income on Nonaccrual Loans	0
Commercial
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	135	293	251
Current Loans	288,416	240,261	146,849
Total	288,551	240,554	147,100
Loans 90 or More Days Past Due and Still Accruing Interest	0	0	5
Nonaccrual Loans	64	78	63
Nonaccrual With No Allowance for Credit Loss	64
Interest Income on Nonaccrual Loans	0
Commercial Real Estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	4,340	1,658	1,482
Current Loans	577,167	570,129	524,648
Total	581,507	571,787	526,130
Loans 90 or More Days Past Due and Still Accruing Interest	0	184	238
Nonaccrual Loans	4,364	1,475	1,445
Nonaccrual With No Allowance for Credit Loss	1,641
Interest Income on Nonaccrual Loans	14
Consumer
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	3,647	9,068	7,636
Current Loans	857,524	850,700	817,073
Total	861,171	859,768	824,709
Loans 90 or More Days Past Due and Still Accruing Interest	0	0	93
Nonaccrual Loans	746	1,470	715
Nonaccrual With No Allowance for Credit Loss	746
Interest Income on Nonaccrual Loans	0
Residential
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	3,953	2,764	3,367
Current Loans	904,061	920,157	912,887
Total	908,014	922,921	916,254
Loans 90 or More Days Past Due and Still Accruing Interest	242	44	101
Nonaccrual Loans	2,913	3,010	2,720
Nonaccrual With No Allowance for Credit Loss	2,913
Interest Income on Nonaccrual Loans	0
Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	4,536	5,339	7,900
Financing Receivables, 30 to 59 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	63	102	173
Financing Receivables, 30 to 59 Days Past Due | Commercial Real Estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	143	0	461
Financing Receivables, 30 to 59 Days Past Due | Consumer
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	2,233	4,976	5,636
Financing Receivables, 30 to 59 Days Past Due | Residential
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	2,097	261	1,630
Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	3,735	4,105	1,843
Financing Receivables, 60 to 89 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	34	113	70
Financing Receivables, 60 to 89 Days Past Due | Commercial Real Estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	2,723	0	110
Financing Receivables, 60 to 89 Days Past Due | Consumer
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	822	2,713	1,451
Financing Receivables, 60 to 89 Days Past Due | Residential
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	156	1,279	212
Financing Receivables, Equal to Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	3,804	4,339	2,993
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	38	78	8
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Real Estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	1,474	1,658	911
Financing Receivables, Equal to Greater than 90 Days Past Due | Consumer
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	592	1,379	549
Financing Receivables, Equal to Greater than 90 Days Past Due | Residential
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded investment, past due	$ 1,700	$ 1,224	$ 1,525

Loans - Additional Information

Loans - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)loan_portfolio	Dec. 31, 2020USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Number of loan portfolios | loan_portfolio	4
Off-balance sheet, credit loss, liability	$ 993
Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Line Items]
Off-balance sheet, credit loss, liability		$ 1,100
Consumer | Minimum | Automobile Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Principal repayment terms, period	3 years
Consumer | Minimum | Credit Card Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Principal repayment terms, period	1 year
Consumer | Maximum | Automobile Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Principal repayment terms, period	7 years
Consumer | Maximum | Credit Card Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Principal repayment terms, period	5 years

Loans - Amortized Cost Basis of

Loans - Amortized Cost Basis of Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Loans	$ 2,612,403	$ 2,565,798	$ 2,390,556
Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Loans	5,007
Real Estate | Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Loans	0
Real Estate | Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Loans	3,851
Real Estate | Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Loans	0
Real Estate | Residential
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Loans	1,156
Residential Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Loans	1,156
Residential Real Estate | Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Loans	0
Residential Real Estate | Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Loans	0
Residential Real Estate | Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Loans	0
Residential Real Estate | Residential
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Loans	1,156
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Loans	3,851
Commercial Real Estate | Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Loans	0
Commercial Real Estate | Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Loans	3,851
Commercial Real Estate | Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Loans	0
Commercial Real Estate | Residential
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Loans	$ 0

Loans - Allowance for Loan Loss

Loans - Allowance for Loan Losses (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)	Mar. 31, 2020USD ($)	Mar. 31, 2021USD ($)loan	Jan. 01, 2021USD ($)	Dec. 31, 2020USD ($)	Mar. 31, 2020USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Finance receivable, allowance for credit losses	$ 29,232	$ 21,187	$ 26,840		$ 29,232	$ 23,637
Financing receivable, accrued interest, after allowance for credit loss			$ 6,100
Financing receivable, allowance for credit loss, period increase (decrease)	1,100
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	29,232	21,187
Charge-offs	(633)	(481)
Recoveries	189	159
Provision	(648)	2,772
Allowance for Loan Losses, Ending Balance	26,840	23,637
Number of loans individually evaluated for impairment | loan			6
Number of loans with an allowance for credit loss on loans individually evaluated for impairment | loan			1
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated			$ 556		41	41
Allowance for loan losses - Loans Collectively Evaluated			26,284		29,191	23,596
Ending Loan Balance - Individually Evaluated			5,007		2,703	2,235
Ending Loan Balance - Collectively Evaluated			2,634,236		2,592,327	2,411,958
Accounting Standards Update 2016-13
Financing Receivable, Allowance for Credit Loss [Line Items]
Finance receivable, allowance for credit losses				$ (1,300)
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Finance receivable, allowance for credit losses	(1,300)				(1,300)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	(1,300)
Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Line Items]
Finance receivable, allowance for credit losses	27,932				27,932
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	27,932
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Finance receivable, allowance for credit losses	2,429	10,004	2,429		11,562	10,004
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	11,562	9,408
Charge-offs	(627)	(467)
Recoveries	189	159
Provision	688	904
Allowance for Loan Losses, Ending Balance	2,429	10,004
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated			0		0	0
Allowance for loan losses - Loans Collectively Evaluated			2,429		11,562	10,004
Ending Loan Balance - Individually Evaluated			0		111	111
Ending Loan Balance - Collectively Evaluated			861,171		859,657	824,598
Consumer | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Finance receivable, allowance for credit losses	(9,383)				(9,383)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	(9,383)
Consumer | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Line Items]
Finance receivable, allowance for credit losses	2,179				2,179
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	2,179
Residential
Financing Receivable, Allowance for Credit Loss [Line Items]
Finance receivable, allowance for credit losses	8,170	4,929	8,170		5,507	4,929
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	5,507	4,563
Charge-offs	(3)	0
Recoveries	0	0
Provision	(1,269)	366
Allowance for Loan Losses, Ending Balance	8,170	4,929
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated			0		22	37
Allowance for loan losses - Loans Collectively Evaluated			8,170		5,485	4,892
Ending Loan Balance - Individually Evaluated			1,156		1,417	953
Ending Loan Balance - Collectively Evaluated			906,858		921,504	915,301
Residential | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Finance receivable, allowance for credit losses	3,935				3,935
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	3,935
Residential | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Line Items]
Finance receivable, allowance for credit losses	9,442				9,442
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	9,442
Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Finance receivable, allowance for credit losses	4,297	1,639	4,297		2,173	1,639
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	2,173	1,386
Charge-offs	(3)	(14)
Recoveries	0	0
Provision	43	267
Allowance for Loan Losses, Ending Balance	4,297	1,639
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated			0		19	4
Allowance for loan losses - Loans Collectively Evaluated			4,297		2,154	1,635
Ending Loan Balance - Individually Evaluated			0		47	34
Ending Loan Balance - Collectively Evaluated			288,551		240,507	147,066
Commercial | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Finance receivable, allowance for credit losses	2,084				2,084
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	2,084
Commercial | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Line Items]
Finance receivable, allowance for credit losses	4,257				4,257
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	4,257
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Finance receivable, allowance for credit losses	11,944	7,065	11,944		9,990	7,065
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	9,990	5,830
Charge-offs	0	0
Recoveries	0	0
Provision	(110)	1,235
Allowance for Loan Losses, Ending Balance	11,944	$ 7,065
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated			556		0	0
Allowance for loan losses - Loans Collectively Evaluated			11,388		9,990	7,065
Ending Loan Balance - Individually Evaluated			3,851		1,128	1,137
Ending Loan Balance - Collectively Evaluated			$ 577,656		570,659	$ 524,993
Commercial Real Estate | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Finance receivable, allowance for credit losses	2,064				2,064
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	2,064
Commercial Real Estate | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Line Items]
Finance receivable, allowance for credit losses	12,054				$ 12,054
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	$ 12,054

Loans - Credit Quality Indicato

Loans - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 2,639,243	$ 2,595,030	$ 2,414,193
Total Loans	2,612,403	2,565,798	2,390,556
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	78,184
2020	136,599
2019	18,268
2018	15,693
2017	10,004
Prior	15,750
Revolving Loans Amortized Cost Basis	14,053
Revolving Loan Converted to Term	0
Total	288,551
Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2021	26,532
2020	327,585
2019	55,973
2018	45,065
2017	24,700
Prior	98,466
Revolving Loans Amortized Cost Basis	3,186
Revolving Loan Converted to Term	0
Total	581,507
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	95,223
2020	321,716
2019	225,372
2018	135,835
2017	56,675
Prior	25,902
Revolving Loans Amortized Cost Basis	448
Revolving Loan Converted to Term	0
Total	861,171	859,768	824,709
Mortgage loans in process of foreclosure, amount	1,400
Residential
Financing Receivable, Credit Quality Indicator [Line Items]
2021	34,833
2020	156,703
2019	114,523
2018	107,203
2017	110,457
Prior	268,921
Revolving Loans Amortized Cost Basis	115,374
Revolving Loan Converted to Term	0
Total	908,014	922,921	916,254
Satisfactory
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		754,960	637,461
Satisfactory | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	78,184
2020	126,061
2019	18,202
2018	15,693
2017	10,004
Prior	12,234
Revolving Loans Amortized Cost Basis	14,006
Revolving Loan Converted to Term	0
Total	274,384
Total Loans		229,351	140,218
Satisfactory | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2021	24,511
2020	298,907
2019	49,957
2018	44,902
2017	24,558
Prior	83,690
Revolving Loans Amortized Cost Basis	3,161
Revolving Loan Converted to Term	0
Total	529,686
Total Loans		525,609	497,243
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		17,787	283
Special Mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	5,031
2019	66
2018	0
2017	0
Prior	2
Revolving Loans Amortized Cost Basis	0
Revolving Loan Converted to Term	0
Total	5,099
Total Loans		1,574	28
Special Mention | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	17,825
2019	2,010
2018	0
2017	142
Prior	2,115
Revolving Loans Amortized Cost Basis	0
Revolving Loan Converted to Term	0
Total	22,092
Total Loans		16,213	255
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		39,594	35,486
Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	5,507
2019	0
2018	0
2017	0
Prior	3,514
Revolving Loans Amortized Cost Basis	47
Revolving Loan Converted to Term	0
Total	9,068
Total Loans		9,629	6,854
Substandard | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2021	2,021
2020	10,853
2019	4,006
2018	163
2017	0
Prior	12,661
Revolving Loans Amortized Cost Basis	25
Revolving Loan Converted to Term	0
Total	29,729
Total Loans		29,965	28,632
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		0	0
Doubtful | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loan Converted to Term	0
Total	0
Total Loans		0	0
Doubtful | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loan Converted to Term	0
Total	0
Total Loans		0	0
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		1,778,165	1,737,334
Performing | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	95,223
2020	321,575
2019	225,191
2018	135,646
2017	56,508
Prior	25,834
Revolving Loans Amortized Cost Basis	448
Revolving Loan Converted to Term	0
Total	860,425
Total Loans		858,298	823,901
Performing | Residential
Financing Receivable, Credit Quality Indicator [Line Items]
2021	34,833
2020	156,500
2019	114,523
2018	107,176
2017	110,308
Prior	266,377
Revolving Loans Amortized Cost Basis	115,142
Revolving Loan Converted to Term	0
Total	904,859
Total Loans		919,867	913,433
Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		4,524	3,629
Nonperforming | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	141
2019	181
2018	189
2017	167
Prior	68
Revolving Loans Amortized Cost Basis	0
Revolving Loan Converted to Term	0
Total	746
Total Loans		1,470	808
Nonperforming | Residential
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	203
2019	0
2018	27
2017	149
Prior	2,544
Revolving Loans Amortized Cost Basis	232
Revolving Loan Converted to Term	0
Total	$ 3,155
Total Loans		$ 3,054	$ 2,821

Loans - Impaired Loans (Details

Loans - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2020
Recorded Investment:
With No Related Allowance	$ 1,946	$ 2,410
With a Related Allowance	289	290
Unpaid Principal Balance:
With No Related Allowance	1,945	2,413
With a Related Allowance	290	291
Average Recorded Balance:
With No Related Allowance	1,377
With a Related Allowance	292
Interest Income Recognized:
With No Related Allowance	10
With a Related Allowance	0
Cash Basis Income:
With No Related Allowance	0
With a Related Allowance	0
Commercial
Recorded Investment:
With No Related Allowance	0	0
With a Related Allowance	33	46
Unpaid Principal Balance:
With No Related Allowance	0	0
With a Related Allowance	34	47
Average Recorded Balance:
With No Related Allowance	0
With a Related Allowance	34
Interest Income Recognized:
With No Related Allowance	0
With a Related Allowance	0
Cash Basis Income:
With No Related Allowance	0
With a Related Allowance	0
Commercial Real Estate
Recorded Investment:
With No Related Allowance	1,137	1,124
With a Related Allowance	0	0
Unpaid Principal Balance:
With No Related Allowance	1,137	1,128
With a Related Allowance	0	0
Average Recorded Balance:
With No Related Allowance	569
With a Related Allowance	0
Interest Income Recognized:
With No Related Allowance	10
With a Related Allowance	0
Cash Basis Income:
With No Related Allowance	0
With a Related Allowance	0
Consumer
Recorded Investment:
With No Related Allowance	112	112
With a Related Allowance	0	0
Unpaid Principal Balance:
With No Related Allowance	111	111
With a Related Allowance	0	0
Average Recorded Balance:
With No Related Allowance	110
With a Related Allowance	0
Interest Income Recognized:
With No Related Allowance	0
With a Related Allowance	0
Cash Basis Income:
With No Related Allowance	0
With a Related Allowance	0
Residential
Recorded Investment:
With No Related Allowance	697	1,174
With a Related Allowance	256	244
Unpaid Principal Balance:
With No Related Allowance	697	1,174
With a Related Allowance	256	$ 244
Average Recorded Balance:
With No Related Allowance	698
With a Related Allowance	258
Interest Income Recognized:
With No Related Allowance	0
With a Related Allowance	0
Cash Basis Income:
With No Related Allowance	0
With a Related Allowance	$ 0

Loans - Modified in Trouble Deb

Loans - Modified in Trouble Debt Restructurings (Details) - Entity Loan Modification Program - Payment Deferral $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)loancontract	Mar. 31, 2020USD ($)loancontract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 16
Post-Modification Outstanding Recorded Investment	$ 0	$ 16
Subsequent Default, Number of Contracts | contract	0	0
Subsequent Default, Recorded Investment	$ 0	$ 0
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0
Subsequent Default, Number of Contracts | contract	0	0
Subsequent Default, Recorded Investment	$ 0	$ 0
Commercial Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0
Subsequent Default, Number of Contracts | contract	0	0
Subsequent Default, Recorded Investment	$ 0	$ 0
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 16
Post-Modification Outstanding Recorded Investment	$ 0	$ 16
Subsequent Default, Number of Contracts | contract	0	0
Subsequent Default, Recorded Investment	$ 0	$ 0
Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0
Subsequent Default, Number of Contracts | contract	0	0
Subsequent Default, Recorded Investment	$ 0	$ 0

Commitments and Contingencies -

Commitments and Contingencies - Commitments to Extend Credit and Letters of Credit (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Commitments to Extend Credit
Loan Commitments and Letters of Credit [Line Items]
Notional Amount	$ 437,920	$ 399,882	$ 376,519
Fair Value	0	0	0
Standby Letters of Credit
Loan Commitments and Letters of Credit [Line Items]
Notional Amount	3,775	3,703	3,301
Fair Value	$ 12	$ 28	$ 29
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 Co

Comprehensive Income - Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Before-Tax Amount
Other comprehensive income (loss), before tax	$ (3,062)	$ 5,300
Tax (Expense) Benefit
Other comprehensive income (loss), tax	782	(1,355)
Net-of-Tax Amount
Other comprehensive income (loss) before reclassifications	(2,337)	3,879
Reclassification from AOCI, current period	57	66
Other Comprehensive (Loss) Income	(2,280)	3,945
Unrealized Gains and Losses on Available for Sale Securities
Before-Tax Amount
OCI, before reclassifications	(5,121)	5,504
Tax (Expense) Benefit
Other comprehensive income (loss) before reclassifications, tax	1,309	(1,406)
Net-of-Tax Amount
Other comprehensive income (loss) before reclassifications	(3,812)	4,098
Reclassification from AOCI, current period	0	0
Other Comprehensive (Loss) Income	(3,812)	4,098
Unrealized Loss on Cash Flow Swap
Before-Tax Amount
OCI, before reclassifications	1,982	(294)
Reclassification from AOCI, current period	(28)
Tax (Expense) Benefit
Other comprehensive income (loss) before reclassifications, tax	(507)	75
Reclassification from AOCI, current period	8
Net-of-Tax Amount
Other comprehensive income (loss) before reclassifications	1,475	(219)
Reclassification from AOCI, current period	(20)	0
Other Comprehensive (Loss) Income	1,455	(219)
Amortization of Net Retirement Plan Actuarial Gain (Loss)
Before-Tax Amount
Reclassification from AOCI, current period	46	36
Tax (Expense) Benefit
Reclassification from AOCI, current period	(12)	(9)
Net-of-Tax Amount
Other comprehensive income (loss) before reclassifications	0	0
Reclassification from AOCI, current period	34	27
Other Comprehensive (Loss) Income	34	27
Amortization of Defined Benefit Pension, Prior-Service Costs
Before-Tax Amount
Reclassification from AOCI, current period	59	54
Tax (Expense) Benefit
Reclassification from AOCI, current period	(16)	(15)
Net-of-Tax Amount
Other comprehensive income (loss) before reclassifications	0	0
Reclassification from AOCI, current period	43	39
Other Comprehensive (Loss) Income	$ 43	$ 39

Comprehensive Income - Changes

Comprehensive Income - Changes in Accumulated Other Comprehensive Income By Component (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	$ 334,392	$ 301,728
Other comprehensive income or loss before reclassifications	(2,337)	3,879
Amounts reclassified from accumulated other comprehensive income	57	66
Other Comprehensive (Loss) Income	(2,280)	3,945
Stockholders' equity, ending balance	342,413	309,398
AOCI Attributable to Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	(816)	(6,357)
Stockholders' equity, ending balance	(3,096)	(2,412)
Unrealized Gains and Losses on Available for Sale Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	5,799	465
Other comprehensive income or loss before reclassifications	(3,812)	4,098
Amounts reclassified from accumulated other comprehensive income	0	0
Other Comprehensive (Loss) Income	(3,812)	4,098
Stockholders' equity, ending balance	1,987	4,563
Unrealized Loss on Cash Flow Swap
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	485	0
Other comprehensive income or loss before reclassifications	1,475	(219)
Amounts reclassified from accumulated other comprehensive income	(20)	0
Other Comprehensive (Loss) Income	1,455	(219)
Stockholders' equity, ending balance	1,940	(219)
Net Actuarial Gain (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	(5,929)	(5,847)
Other comprehensive income or loss before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	34	27
Other Comprehensive (Loss) Income	34	27
Stockholders' equity, ending balance	(5,895)	(5,820)
Net Prior Service (Cost) Credit
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	(1,171)	(975)
Other comprehensive income or loss before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	43	39
Other Comprehensive (Loss) Income	43	39
Stockholders' equity, ending balance	$ (1,128)	$ (936)

Comprehensive Income - Reclassi

Comprehensive Income - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 1,539	$ 5,220
Salaries and Employee Benefits	11,138	10,383
Total before Tax	16,733	10,174
Provision for income taxes	(3,453)	(2,047)
Net Income	13,280	8,127
Amounts Reclassified from Accumulated Other Comprehensive Income | Unrealized Loss on Cash Flow Swap
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	28
Amounts Reclassified from Accumulated Other Comprehensive Income | Amortization of Defined Benefit Pension, Prior-Service Costs
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Salaries and Employee Benefits	(59)	(54)
Amounts Reclassified from Accumulated Other Comprehensive Income | Amortization of Defined Benefit Pension, Actuarial Loss
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Salaries and Employee Benefits	(46)	(36)
Amounts Reclassified from Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before Tax	(77)	(90)
Provision for income taxes	20	24
Net Income	$ (57)	$ (66)

Stock-Based Compensation (Detai

Stock-Based Compensation (Details)	3 Months Ended
	Mar. 31, 2021plan$ / sharesshares	Sep. 25, 2020
Share-based Payment Arrangement [Abstract]
Number of plans | plan	3
Stock dividend, percent		3.00%
Shares
Outstanding, beginning of period (in shares) | shares	264,090
Granted (in shares) | shares	55,500
Exercised (in shares) | shares	(6,927)
Forfeited (in shares) | shares	(1,034)
Outstanding, end of period (in shares) | shares	311,629
Vested at period end (in shares) | shares	179,681
Expected to vest (in shares) | shares	131,948
Weighted Average Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 28.84
Granted (in dollars per share)	29.55
Exercised (in dollars per share)	22.52
Forfeited (in dollars per share)	19.70
Outstanding, end of period (in dollars per share)	29.14
Vested at period end (in dollars per share)	27.73
Expected to vest (in dollars per share)	31.05
Fair Value of Options Granted (in dollars per share)	$ 4.85
Dividend Yield	3.41%
Expected Volatility	26.53%
Risk Free Interest Rate	0.49%
Expected Lives (in years)	8 years 9 months
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
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	3 years

Stock-Based Compensation - Stoc

Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount expensed	$ 72	$ 76
Discount from market price, percent	5.00%
Restricted Stock Units (RSU)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount expensed	$ 32	$ 27

Stock-Based Compensation - Rest

Stock-Based Compensation - Restricted Stock Units (Details) - Restricted Stock Units (RSU) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Restricted Stock Units
Balance at Beginning of Period (in shares)	11,663	7,721
Granted (in shares)	4,738	3,942
Vested (in shares)	(3,582)
Balance at End of Period (in shares)	12,819	11,663
Weighted Average Grant Date Fair Value
Outstanding at Beginning of period (in dollars per share)	$ 31.62	$ 30.27
Granted (in dollars per share)	29.40	34.25
Vested (in dollars per share)	30.71
Outstanding at End of period (in dollars per share)	$ 31.05	$ 31.62

Retirement Benefit Plans (Detai

Retirement Benefit Plans (Details)	3 Months Ended
	Mar. 31, 2021USD ($)	Mar. 31, 2020USD ($)
Net Periodic Benefit Cost [Line Items]
Interest credit under cash balance plan	0.03
Employer matching contribution, percentage	5.00%
Employees' Pension Plan
Net Periodic Benefit Cost [Line Items]
Assumptions used calculating benefit obligation, interest rate to annuitize cash balance account	0.53%
Defined benefit plan, increase in benefit payable, percent	3.00%
Defined benefit plan, benefit obligation, increase (decrease) for plan amendment	$ 351,638
Defined benefit plan, amortization of service cost	9 years 8 months 12 days
Service Cost	$ 460,000	$ 430,000
Interest Cost	340,000	417,000
Expected Return on Plan Assets	(950,000)	(904,000)
Amortization of Prior Service (Credit) Cost	20,000	16,000
Amortization of Net Loss	0	1,000
Net Periodic (Benefit) Cost	(130,000)	(40,000)
Plan Contributions During the Period	$ 0	0
Select Executive Retirement Plan
Net Periodic Benefit Cost [Line Items]
Assumptions used calculating benefit obligation, interest rate to annuitize cash balance account	2.31%
Defined benefit plan, amortization of service cost	12 years 6 months
Defined benefit plan, benefit obligation, period increase (decrease)	$ 122,797
Service Cost	118,000	103,000
Interest Cost	45,000	54,000
Expected Return on Plan Assets	0	0
Amortization of Prior Service (Credit) Cost	12,000	11,000
Amortization of Net Loss	38,000	33,000
Net Periodic (Benefit) Cost	213,000	201,000
Plan Contributions During the Period	$ 118,000	117,000
Post-Retirement Benefit Plans
Net Periodic Benefit Cost [Line Items]
Assumptions used calculating benefit obligation, interest rate to annuitize cash balance account	3.09%
Service Cost	$ 31,000	33,000
Interest Cost	67,000	78,000
Expected Return on Plan Assets	0	0
Amortization of Prior Service (Credit) Cost	27,000	27,000
Amortization of Net Loss	8,000	2,000
Net Periodic (Benefit) Cost	133,000	140,000
Plan Contributions During the Period	$ 28,000	$ 78,000
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
		Mar. 31, 2021	Mar. 31, 2020	Sep. 25, 2020
Earnings Per Share [Abstract]
Stock dividend, percent				3.00%
Net Income		$ 13,280	$ 8,127
Weighted Average Shares - Basic (in shares)	[1]	15,528	15,446
Earnings Per Share - Basic (in dollars per share)		$ 0.86	$ 0.53
Dilutive Average Shares Attributable to Stock Options (in shares)		35	30
Weighted Average Shares - Diluted (in shares)	[1]	15,563	15,476
Earnings Per Share - Diluted (in dollars per share)		$ 0.85	$ 0.53
[1]	2020 Share and Per Share Amounts have been restated for the September 25, 2020 3% stock dividend.

Fair Values - Recurring and Non

Fair Values - Recurring and Nonrecurring (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale at Fair Value	$ 464,089	$ 365,287	$ 378,186
Equity Securities	1,796	1,636	1,689
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale at Fair Value	464,089	365,287	378,186
Equity Securities	1,796	1,636	1,689
Total Securities Measured on a Recurring Basis	465,885	366,923	379,875
Derivatives, included in other assets	2,298	5,080	5,191
Total Measured on a Recurring Basis	468,183	372,003	385,066
Derivatives, included in other liabilities	2,298	5,080	5,191
Total Measured on a Recurring Basis	2,298	5,080	5,191
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 at Fair Value	0	0	0
Equity Securities	0	0	0
Total Securities Measured on a Recurring Basis	0	0	0
Derivatives, included in other assets	0	0	0
Total Measured on a Recurring Basis	0	0	0
Derivatives, included in other liabilities	0	0	0
Total Measured on a Recurring Basis	0	0	0
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 at Fair Value	464,089	365,287	378,186
Equity Securities	1,796	1,636	1,689
Total Securities Measured on a Recurring Basis	465,885	366,923	379,875
Derivatives, included in other assets	2,298	5,080	5,191
Total Measured on a Recurring Basis	468,183	372,003	385,066
Derivatives, included in other liabilities	2,298	5,080	5,191
Total Measured on a Recurring Basis	2,298	5,080	5,191
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 at Fair Value	0	0	0
Equity Securities	0	0	0
Total Securities Measured on a Recurring Basis	0	0	0
Derivatives, included in other assets	0	0	0
Total Measured on a Recurring Basis	0	0	0
Derivatives, included in other liabilities	0	0	0
Total Measured on a Recurring Basis	0	0	0
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral Dependent Evaluated Loans	2,423	594	582
Collateral Dependent Impaired Loans, Losses Recognized in Earnings
Other Real Estate Owned and Repossessed Assets, Net	242	155	942
Other Real Estate owned and Repossessed Assets, Net, Losses Recognized in Earnings	0	0	0
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]
Collateral Dependent Evaluated Loans	0	0	0
Other Real Estate Owned 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]
Collateral Dependent Evaluated Loans	0	0	0
Other Real Estate Owned 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]
Collateral Dependent Evaluated Loans	2,423	594	582
Other Real Estate Owned and Repossessed Assets, Net	242	155	942
U.S. Government & Agency Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale at Fair Value	108,370	65,112	5,181
U.S. Government & Agency Obligations | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale at Fair Value	108,370	65,112	5,181
U.S. Government & 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 at Fair Value	0	0	0
U.S. Government & 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 at Fair Value	108,370	65,112	5,181
U.S. Government & 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 at Fair Value	0	0	0
State and Municipal Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale at Fair Value	508	528	723
State and Municipal Obligations | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale at Fair Value	508	528	723
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 at Fair Value	0	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 at Fair Value	508	528	723
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 at Fair Value	0	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 at Fair Value	354,411	298,847	371,482
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 at Fair Value	0	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 at Fair Value	354,411	298,847	371,482
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 at Fair Value	0	0	0
Corporate and Other Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale at Fair Value	800	800	800
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 at Fair Value	800	800	800
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 at Fair Value	0	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 at Fair Value	800	800	800
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 at Fair Value	$ 0	$ 0	$ 0

Fair Values - Fair Value by Bal

Fair Values - Fair Value by Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Carrying Value
Cash and Cash Equivalents	$ 452,207	$ 380,991	$ 138,529	$ 70,221
Available-for-Sale at Fair Value	464,089	365,287	378,186
Securities Held-to-Maturity	214,561	218,405	238,520
Equity Securities	1,796	1,636	1,689
Total Loans	2,612,403	2,565,798	2,390,556
Deposits	3,453,588	3,234,726	2,811,005
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	6,795	17,486	57,909
Federal Home Loan Bank Term Advances	45,000	45,000	50,000
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	20,000
Fair Value
Available-for-Sale	464,089	365,287	378,186
Securities Held-to-Maturity	221,360	226,576	242,804
Equity Securities	1,796	1,636	1,689
Carrying Amount
Carrying Value
Cash and Cash Equivalents	452,207	380,991	138,529
Available-for-Sale at Fair Value	464,089	365,287	378,186
Securities Held-to-Maturity	214,561	218,405	238,520
Equity Securities	1,796	1,636	1,689
Federal Home Loan Bank and Federal Reserve Bank Stock	5,360	5,349	5,379
Total Loans	2,612,403	2,565,798	2,390,556
Accrued Interest Receivable	8,258	7,495	7,856
Derivatives, included in other assets	2,298	5,080	5,191
Deposits	3,453,588	3,234,726	2,811,005
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	6,795	17,486	57,909
Federal Home Loan Bank Overnight Advances		45,000
Federal Home Loan Bank Term Advances	45,000		50,000
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	20,000
Accrued Interest Payable	237	326	1,392
Derivatives, included in other liabilities	2,298	5,080	5,191
Fair Value
Available-for-Sale	464,089	365,287	378,186
Equity Securities	1,796	1,636	1,689
Derivatives, included in other assets	2,298	5,080	5,191
Derivatives, included in other liabilities	2,298	5,080	5,191
Fair Value
Carrying Value
Available-for-Sale at Fair Value	464,089	365,287	378,186
Equity Securities	1,796	1,636	1,689
Derivatives, included in other assets	2,298	5,080	5,191
Derivatives, included in other liabilities	2,298	5,080	5,191
Fair Value
Cash and Cash Equivalents	452,207	380,991	138,529
Available-for-Sale	464,089	365,287	378,186
Securities Held-to-Maturity	221,360	226,576	242,804
Equity Securities	1,796	1,636	1,689
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value	5,360	5,349	5,379
Net Loans, at Fair Value	2,603,225	2,558,903	2,368,033
Accrued Interest Receivable	8,258	7,495	7,856
Derivatives, included in other assets	2,298	5,080	5,191
Deposits	3,452,595	3,234,387	2,811,668
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	6,795	17,486	57,909
Federal Home Loan Bank Overnight Advances		46,474
Federal Home Loan Bank Term Advances	46,176		51,194
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	20,000
Accrued Interest Payable	237	326	1,392
Derivatives, included in other liabilities	2,298	5,080	5,191
Quoted Prices In Active Markets for Indentical Assets (Level 1) | Fair Value
Carrying Value
Available-for-Sale at Fair Value	0	0	0
Equity Securities	0	0	0
Derivatives, included in other assets		0	0
Derivatives, included in other liabilities	0	0	0
Fair Value
Cash and Cash Equivalents	452,207	380,991	138,529
Available-for-Sale	0	0	0
Securities Held-to-Maturity	0	0	0
Equity Securities	0	0	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	0	0	0
Derivatives, included in other assets		0	0
Deposits	0	0	0
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	0	0	0
Federal Home Loan Bank Overnight Advances		0
Federal Home Loan Bank Term Advances	0		0
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	0	0	0
Accrued Interest Payable	0	0	0
Derivatives, included in other liabilities	0	0	0
Significant Other Observable Inputs (Level 2) | Fair Value
Carrying Value
Available-for-Sale at Fair Value	464,089	365,287	378,186
Equity Securities	1,796	1,636	1,689
Derivatives, included in other assets	2,298	5,080	5,191
Derivatives, included in other liabilities	2,298	5,080	5,191
Fair Value
Cash and Cash Equivalents	0	0	0
Available-for-Sale	464,089	365,287	378,186
Securities Held-to-Maturity	221,360	226,576	242,804
Equity Securities	1,796	1,636	1,689
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value	5,360	5,349	5,379
Net Loans, at Fair Value	0	0	0
Accrued Interest Receivable	8,258	7,495	7,856
Derivatives, included in other assets	2,298	5,080	5,191
Deposits	3,452,595	3,234,387	2,811,668
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	6,795	17,486	57,909
Federal Home Loan Bank Overnight Advances		46,474
Federal Home Loan Bank Term Advances	46,176		51,194
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	20,000
Accrued Interest Payable	237	326	1,392
Derivatives, included in other liabilities	2,298	5,080	5,191
Significant Unobservable Inputs (Level 3) | Fair Value
Carrying Value
Available-for-Sale at Fair Value	0	0	0
Equity Securities	0
Derivatives, included in other assets		0	0
Derivatives, included in other liabilities	0	0	0
Fair Value
Cash and Cash Equivalents	0	0	0
Available-for-Sale	0	0	0
Securities Held-to-Maturity	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	2,603,225	2,558,903	2,368,033
Accrued Interest Receivable	0	0	0
Derivatives, included in other assets		0	0
Deposits	0	0	0
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	0	0	0
Federal Home Loan Bank Overnight Advances		0
Federal Home Loan Bank Term Advances	0		0
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	0	0	0
Accrued Interest Payable	0	0	0
Derivatives, included in other liabilities	$ 0	$ 0	$ 0

Leases - Narrative (Details)

Leases - Narrative (Details)	3 Months Ended
	Mar. 31, 2021branch_office
Leases [Abstract]
Number of branch offices	4

Leases - Quantitative Lease Dat

Leases - Quantitative Lease Data (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Finance Lease Amounts:
Right-of-Use Assets	$ 4,947	$ 5,124
Lease Liabilities	5,205	5,249	$ 5,217
Operating Lease Amounts:
Right-of-Use Assets	5,435	5,529
Lease Liabilities	5,522	5,602
Cash Paid For Amounts Included In The Measurement Of Lease Liabilities:
Operating Outgoing Cash Flows From Finance Leases	49	50
Operating Outgoing Cash Flows From Operating Leases	261	158
Financing Outgoing Cash Flows From Finance Leases	12	5
Right-of-Use Assets Obtained In Exchange For New Finance Lease Liabilities	0	0
Right-of-Use Assets Obtained In Exchange For New Operating Lease Liabilities	$ 331	$ 0
Weighted-average Remaining Lease Term - Finance Leases (Yrs.)	28 years 10 months 24 days	29 years 10 months 24 days
Weighted-average Remaining Lease Term - Operating Leases (Yrs.)	12 years 6 months	13 years 8 months 12 days
Weighted-average Discount Rate—Finance Leases	3.75%	3.75%
Weighted-average Discount Rate—Operating Leases	3.13%	3.36%
Finance Lease Cost:
Reduction of Right-of-Use Assets	$ 44	$ 44
Interest on Lease Liabilities	49	50
Operating Lease Cost	209	207
Short-term Lease Cost	5	7
Variable Lease Cost	104	55
Total Lease Cost	$ 411	$ 363

Leases - Future Lease Payments

Leases - Future Lease Payments on Finance and Operating Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Operating Leases
2021	$ 799
2022	766
2023	641
2024	570
2025	526
Thereafter	3,516
Total Undiscounted Cash Flows	6,818
Less: Net Present Value Adjustment	1,296
Lease Liabilities	5,522		$ 5,602
Financing Leases
2021	243
2022	243
2023	243
2024	254
2025	265
Thereafter	7,733
Total Undiscounted Cash Flows	8,981
Less: Net Present Value Adjustment	3,776
Lease Liabilities	$ 5,205	$ 5,217	$ 5,249

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities - Interest Rate Swap Agreements (Details) - Not Designated as Hedging Instrument - Interest Rate Swap - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Derivative [Line Items]
Notional amount	$ 175,113	$ 176,637	$ 121,559
Other Assets
Derivative [Line Items]
Derivative asset	2,298	5,080	5,191
Other Liabilities
Derivative [Line Items]
Derivative liability	$ 2,298	$ 5,080	$ 5,191

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities - Cash Flow Hedge Agreements (Details) - Interest Rate Swap - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Derivative [Line Items]
Amount of hedged item	$ 20,000
Amount of gain (loss) recognized in AOCI	1,982	$ (294)	$ 651
Amount of gain reclassified from AOCI interest expense	$ 28	$ 0	$ 0