Enterprise Bancorp (EBTC) 10-Q 6 Nov 20 2020 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Nov. 02, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	001-33912
Entity Registrant Name	Enterprise Bancorp, Inc.
Entity Incorporation, State or Country Code	MA
Entity Tax Identification Number	04-3308902
Entity Address, Address Line One	222 Merrimack Street,
Entity Address, City or Town	Lowell,
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01852
City Area Code	(978)
Local Phone Number	459-9000
Title of 12(b) Security	Common Stock, $0.01 par value per share
Trading Symbol	EBTC
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		11,926,614
Entity Central Index Key	0001018399
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Amendment Flag	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands		Sep. 30, 2020	Dec. 31, 2019
Cash and cash equivalents:
Cash and due from banks		$ 43,660	$ 39,927
Interest-earning deposits		264,704	23,867
Total cash and cash equivalents		308,364	63,794
Investments:
Debt securities at fair value		497,480	504,788
Equity securities at fair value		651	467
Total investment securities at fair value		498,131	505,255
Federal Home Loan Bank ("FHLB") stock		1,905	4,484
Loans held for sale		5,311	601
Total loans		3,150,815	2,565,459
Allowance for loan losses		(43,835)	(33,614)
Net loans		3,106,980	2,531,845
Premises and equipment, net		47,145	45,419
Lease right-of-use asset		18,580	19,048
Accrued interest receivable		16,466	12,295
Deferred income taxes, net		8,064	8,732
Bank-owned life insurance		31,222	30,776
Prepaid income taxes		3,388	572
Prepaid expenses and other assets		9,335	6,572
Goodwill		5,656	5,656
Total assets		4,060,547	3,235,049
Liabilities
Customer deposits		3,535,065	2,786,730
Brokered deposits	[1]	74,995	0
Total deposits		3,610,060	2,786,730
Borrowed funds		1,679	96,173
Subordinated debt		73,725	14,872
Lease liability		17,690	18,104
Accrued expenses and other liabilities		30,342	21,683
Accrued interest payable		1,271	846
Total liabilities		3,734,767	2,938,408
Commitments and Contingencies
Stockholders' Equity
Preferred stock, $0.01 par value per share; 1,000,000 shares authorized; no shares issued		0	0
Common stock, $0.01 par value per share; 40,000,000 shares authorized; 11,926,198 shares issued and outstanding at September 30, 2020 and 11,825,331 shares issued and outstanding at December 31, 2019		119	118
Additional paid-in capital		96,402	94,170
Retained earnings		207,206	191,843
Accumulated other comprehensive income		22,053	10,510
Total stockholders' equity		325,780	296,641
Total liabilities and stockholders' equity		$ 4,060,547	$ 3,235,049
[1]	(1)    Brokered CDs which are $250,000 and under.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	11,926,198	11,825,331
Common stock, shares, outstanding	11,926,198	11,825,331
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest and dividend income:
Loans and loans held for sale	$ 33,481	$ 30,938	$ 97,472	$ 90,973
Investment securities	3,225	3,278	10,093	9,785
Other interest-earning assets	71	632	315	1,688
Total interest and dividend income	36,777	34,848	107,880	102,446
Interest expense:
Deposits	2,231	5,158	9,856	15,156
Borrowed funds	8	36	603	315
Subordinated debt	1,007	233	1,468	692
Total interest expense	3,246	5,427	11,927	16,163
Net interest income	33,531	29,421	95,953	86,283
Provision for loan losses	1,575	1,025	10,397	1,580
Net interest income after provision for loan losses	31,956	28,396	85,556	84,703
Non-interest income:
Wealth management fees	1,469	1,407	4,255	4,077
Deposit and interchange fees	1,607	1,790	4,804	5,041
Income on bank-owned life insurance, net	143	158	446	482
Net gains on sales of debt securities	127	0	227	146
Net gains on sales of loans	329	139	814	244
Other income	649	655	1,986	2,035
Total non-interest income	4,324	4,149	12,532	12,025
Non-interest expense:
Salaries and employee benefits	15,031	14,382	46,267	41,982
Occupancy and equipment expenses	2,099	2,034	6,357	6,342
Technology and telecommunications expenses	2,316	1,863	6,815	5,290
Advertising and public relations expenses	372	430	1,506	1,927
Audit, legal and other professional fees	498	528	1,715	1,389
Deposit insurance premiums	749	16	1,690	733
Supplies and postage expenses	202	232	675	718
Other operating expenses	1,502	1,613	4,752	5,320
Total non-interest expense	22,769	21,098	69,777	63,701
Income before income taxes	13,511	11,447	28,311	33,027
Provision for income taxes	3,185	2,445	6,712	7,566
Net income	$ 10,326	$ 9,002	$ 21,599	$ 25,461
Basic earnings per share (in dollars per share)	$ 0.87	$ 0.76	$ 1.82	$ 2.16
Diluted earnings per share (in dollars per share)	$ 0.87	$ 0.76	$ 1.81	$ 2.15
Basic weighted average common shares outstanding (in shares)	11,916,486	11,808,603	11,886,811	11,779,629
Diluted weighted average common shares outstanding (in shares)	11,927,043	11,843,497	11,908,716	11,820,388

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 10,326	$ 9,002	$ 21,599	$ 25,461
Net change in fair value of debt securities	(50)	2,249	13,740	13,395
Net change in fair value of cash flow hedges	167	0	(2,197)	0
Total other comprehensive income, net of tax	117	2,249	11,543	13,395
Total comprehensive income, net	$ 10,443	$ 11,251	$ 33,142	$ 38,856

Consolidated Statement of Chang

Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated other comprehensive income/(loss), net
Balance, beginning, shares, outstanding at Dec. 31, 2018		11,708,218
Balance, beginning at Dec. 31, 2018	$ 255,297	$ 117	$ 91,281	$ 165,183	$ (1,284)
Increase (Decrease) in Stockholders' Equity
Net income	25,461			25,461
Other comprehensive income (loss), net	13,395				13,395
Common stock dividend declared	(5,650)			(5,650)
Common stock issued under dividend reinvestment plan, shares		30,189
Common stock issued under dividend reinvestment plan	885	$ 0	885
Common stock issued, shares, other		1,844
Common stock issued, other	55	$ 0	55
Stock-based compensation, shares		62,037
Stock-based compensation, net	1,467	$ 1	1,466
Net settlement for employee taxes on restricted stock and options, shares		(8,223)
Net settlement for employee taxes on restricted stock and options	(402)	$ 0	(402)
Stock options exercised, net, shares		22,006
Stock options exercised, net	174	$ 0	174
Balance, ending, shares, outstanding at Sep. 30, 2019		11,816,071
Balance, ending at Sep. 30, 2019	290,682	$ 118	93,459	184,994	12,111
Balance, beginning, shares, outstanding at Jun. 30, 2019		11,806,008
Balance, beginning at Jun. 30, 2019	280,627	$ 118	92,767	177,880	9,862
Increase (Decrease) in Stockholders' Equity
Net income	9,002			9,002
Other comprehensive income (loss), net	2,249				2,249
Common stock dividend declared	(1,888)			(1,888)
Common stock issued under dividend reinvestment plan, shares		10,345
Common stock issued under dividend reinvestment plan	293	$ 0	293
Common stock issued, shares, other		634
Common stock issued, other	19	$ 0	19
Stock-based compensation, shares		(139)
Stock-based compensation, net	411	$ 0	411
Net settlement for employee taxes on restricted stock and options, shares		(1,654)
Net settlement for employee taxes on restricted stock and options	(49)	$ 0	(49)
Stock options exercised, net, shares		877
Stock options exercised, net	18	$ 0	18
Balance, ending, shares, outstanding at Sep. 30, 2019		11,816,071
Balance, ending at Sep. 30, 2019	$ 290,682	$ 118	93,459	184,994	12,111
Balance, beginning, shares, outstanding at Dec. 31, 2019	11,825,331	11,825,331
Balance, beginning at Dec. 31, 2019	$ 296,641	$ 118	94,170	191,843	10,510
Increase (Decrease) in Stockholders' Equity
Net income	21,599			21,599
Other comprehensive income (loss), net	11,543				11,543
Common stock dividend declared	(6,236)			(6,236)
Common stock issued under dividend reinvestment plan, shares		38,762
Common stock issued under dividend reinvestment plan	914	$ 0	914
Common stock issued, shares, other		3,115
Common stock issued, other	75	$ 0	75
Stock-based compensation, shares		65,912
Stock-based compensation, net	1,447	$ 1	1,446
Net settlement for employee taxes on restricted stock and options, shares		(7,962)
Net settlement for employee taxes on restricted stock and options	(224)	$ 0	(224)
Stock options exercised, net, shares		1,040
Stock options exercised, net	$ 21	$ 0	21
Balance, ending, shares, outstanding at Sep. 30, 2020	11,926,198	11,926,198
Balance, ending at Sep. 30, 2020	$ 325,780	$ 119	96,402	207,206	22,053
Balance, beginning, shares, outstanding at Jun. 30, 2020		11,911,488
Balance, beginning at Jun. 30, 2020	316,676	$ 119	95,656	198,965	21,936
Increase (Decrease) in Stockholders' Equity
Net income	10,326			10,326
Other comprehensive income (loss), net	117				117
Common stock dividend declared	(2,085)			(2,085)
Common stock issued under dividend reinvestment plan, shares		13,931
Common stock issued under dividend reinvestment plan	306	$ 0	306
Common stock issued, shares, other		889
Common stock issued, other	20	$ 0	20
Stock-based compensation, shares		(110)
Stock-based compensation, net	$ 420	$ 0	420
Balance, ending, shares, outstanding at Sep. 30, 2020	11,926,198	11,926,198
Balance, ending at Sep. 30, 2020	$ 325,780	$ 119	$ 96,402	$ 207,206	$ 22,053

Consolidated Statement of Cha_2

Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Stockholders' Equity [Abstract]
Common Stock, Dividends, Per Share, Declared	$ 0.175	$ 0.16	$ 0.525	$ 0.48

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Cash flows from operating activities:
Net income	$ 10,326	$ 9,002	$ 21,599	$ 25,461
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	1,575	1,025	10,397	1,580
Depreciation and amortization			4,946	4,553
Stock-based compensation expense	476	461	1,409	1,405
Income on bank-owned life insurance, net	(143)	(158)	(446)	(482)
Net gains on sales of debt securities	(127)	0	(227)	(146)
Mortgage loans originated for sale			(40,837)	(16,049)
Proceeds from mortgage loans sold			36,941	13,697
Net gains on sales of loans			(814)	(244)
Net losses (gains) on equity securities	3	(12)	135	(275)
Net gains on sales of other real estate owned ("OREO")			0	(34)
Changes in:
Increase in other assets			(9,892)	(2,202)
Increase (decrease) in other liabilities			3,533	(694)
Net cash provided by operating activities			26,744	26,570
Cash flows from investing activities:
Proceeds from sales of debt securities			5,907	13,623
Purchase of debt securities			(34,487)	(83,583)
Proceeds from maturities, calls and pay-downs of debt securities			51,969	36,150
Net purchases of equity securities			(319)	290
Net proceeds from the sales of FHLB capital stock			2,579	3,333
Net increase in loans			(585,532)	(86,373)
Additions to premises and equipment, net			(5,676)	(9,368)
Proceeds from OREO sales			0	289
Net cash used in investing activities			(565,559)	(125,639)
Cash flows from financing activities:
Net increase in deposits			823,330	219,611
Net decrease in borrowed funds			(94,494)	(96,315)
Proceeds from issuance of subordinated debt			60,000	0
Cash dividends paid, net of dividend reinvestment plan			(5,323)	(4,765)
Proceeds from issuance of common stock			75	55
Net settlement for employee taxes on restricted stock and options			(224)	(402)
Net proceeds from stock option exercises			21	174
Net cash provided by financing activities			783,385	118,358
Net increase in cash and cash equivalents			244,570	19,289
Cash and cash equivalents at beginning of period			63,794	63,120	$ 63,120
Cash and cash equivalents at end of period	$ 308,364	$ 82,409	$ 308,364	$ 82,409	$ 63,794

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies (a) Organization of the Company and Basis of Presentation The accompanying unaudited consolidated interim financial statements and these notes should be read in conjunction with the December 31, 2019 audited consolidated financial statements and notes thereto contained in the 2019 Annual Report on Form 10-K of Enterprise Bancorp, Inc. (the "Company," "Enterprise," "we," or "our") as filed with the Securities and Exchange Commission (the "SEC") on March 10, 2020 (the "2019 Annual Report on Form 10-K"). The Company has not materially changed its significant accounting policies from those disclosed in its 2019 Annual Report on Form 10-K, other than to elect options for the temporary deferral of certain accounting guidance as allowed under the Coronavirus Aid, Relief, and Economic Security ("CARES") Act as discussed under Item (c), "Accounting Policies," below in this Note 1. See also Item (e), "Recent Accounting Pronouncements," under the subheading "Accounting pronouncements adopted by the Company," below in this Note 1. The accompanying unaudited consolidated interim financial statements of Enterprise Bancorp, Inc., a Massachusetts corporation, include the accounts of the Company and its wholly owned subsidiary, Enterprise Bank and Trust Company, commonly referred to as Enterprise Bank (the "Bank"). The Bank is a Massachusetts trust company and state chartered commercial bank organized in 1989. Substantially all of the Company's operations are conducted through the Bank and its subsidiaries. The Bank's subsidiaries include Enterprise Insurance Services, LLC and Enterprise Wealth Services, LLC, both organized under the laws of the State of Delaware, to engage in insurance sales activities and offer non-deposit investment products and services, respectively. In addition, the Bank has the following subsidiaries that are incorporated in the Commonwealth of Massachusetts and classified as security corporations in accordance with applicable Massachusetts General Laws: Enterprise Security Corporation; Enterprise Security Corporation II; and Enterprise Security Corporation III. The security corporations, which hold various types of qualifying securities, are limited to conducting investment activities that the Bank itself would be allowed to conduct under applicable laws. The Company's headquarters and the Bank's main office are located at 222 Merrimack Street in Lowell, Massachusetts. At September 30, 2020, the Company had 25 full-service branch banking offices serving the Greater Merrimack Valley, Nashoba Valley and North Central regions of Massachusetts and Southern New Hampshire (Southern Hillsborough and Rockingham counties). The Company is also scheduled to open a branch in North Andover, Massachusetts early 2021. Through the Bank and its subsidiaries, the Company offers a range of commercial, residential and consumer loan products, deposit products and cash management services, electronic and digital banking options, and commercial insurance services. The Company also provides a range of wealth management, wealth services and trust services delivered via two channels, Enterprise Wealth Management and Enterprise Wealth Services. The services offered through the Bank and its subsidiaries are managed as one strategic unit and represent the Company's only reportable operating segment. The Federal Deposit Insurance Corporation (the "FDIC") and the Massachusetts Division of Banks (the "Division") have regulatory authority over the Bank. The Bank is also subject to certain regulatory requirements of the Board of Governors of the Federal Reserve System (the "Federal Reserve Board") and, with respect to its New Hampshire branch operations, the New Hampshire Banking Department. The business and operations of the Company are subject to the regulatory oversight of the Federal Reserve Board. The Division also retains supervisory jurisdiction over the Company. The accompanying unaudited consolidated interim financial statements and notes thereto, on this Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2020 (this "Form 10-Q"), have been prepared in accordance with U.S. generally accepted accounting principles ("GAAP") for interim financial information and the SEC instructions for Quarterly Reports on Form 10-Q through the rules and interpretive releases of the SEC under federal securities law. In the opinion of management, the accompanying unaudited consolidated interim financial statements reflect all necessary adjustments consisting of normal recurring accruals for a fair presentation. All significant intercompany balances and transactions have been eliminated in the accompanying unaudited consolidated interim financial statements. Certain previous years' amounts in the unaudited consolidated financial statements, and notes thereto, have been reclassified to conform to the current year's presentation. Interim results are not necessarily indicative of results to be expected for the entire year, or any future period. (b) Uses of Estimates In preparing the unaudited consolidated interim financial statements in conformity with GAAP, management is required to exercise judgment in determining many of the methodologies, assumptions and estimates to be utilized. These assumptions and estimates affect the reported values of assets and liabilities as of the balance sheet dates and income and expenses for the period then ended. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates should the assumptions and estimates used be incorrect or change over time due to changes in circumstances. Changes in those estimates resulting from continuing changes in the economic environment and other factors will be reflected in the consolidated financial statements and results of operations in future periods. As discussed in the Company's 2019 Annual Report on Form 10-K, the three most significant areas in which management applies critical assumptions and estimates are: the estimates of the allowance for loan losses, impairment review of investment securities, and the impairment review of goodwill. Refer to Note 1, "Summary of Significant Accounting Policies," to the Company's audited consolidated financial statements included in the Company's 2019 Annual Report on Form 10-K for accounting policies related to these significant estimates. (c) Accounting Policies Restricted Cash and Investments When the Company has pledged cash as collateral in relation to certain derivatives, the cash is carried as restricted cash within "Interest-earning deposits" on the Company's Consolidated Balance Sheet. See Note 8, "Derivatives and Hedging Activities," to the Company's unaudited consolidated interim financial statements below in this Form 10-Q for more information about the Company's collateral related to its derivatives. As a member of the FHLB, the Company is required to purchase certain levels of FHLB capital stock at par value in association with outstanding advances from the FHLB. This FHLB stock represents the only restricted investment held by the Company and is carried at cost, which management believes approximates fair value. Based on management's periodic review for other-than-temporary impairment ("OTTI"), the Company has not recorded any OTTI charges on this investment to date. Other Accounting Policies The CARES Act allows certain financial institutions the option to delay the adoption of the Financial Accounting Standards Board ("FASB") Accounting Standards Update ("ASU") No. 2016-13 (Measurement of Credit Losses on Financial Instruments), including the current expected credit loss ("CECL") methodology for estimating allowances for credit losses, during the period beginning on March 27, 2020 until the earlier of (1) the date on which the national emergency concerning the COVID-19 pandemic ("pandemic") declared under the National Emergencies Act terminates; or (2) December 31, 2020. In the first quarter of 2020, the Company elected to delay the adoption of CECL. See Item (e) "Recent Accounting Pronouncements," under the subheading "Accounting pronouncements not yet adopted by the Company," below in this Note 1 for additional information on CECL. In addition, Section 4013 of the CARES Act provides the option for financial institutions to suspend troubled debt restructuring ("TDR") accounting under GAAP in certain circumstances, during the period beginning March 1, 2020 and ending on the earlier of (1) December 31, 2020; or (2) the date that is 60 days after the date on which the national emergency concerning the pandemic declared under the National Emergencies Act terminates. The Company is suspending TDR accounting, which primarily impacts financial statement disclosure, for loans that have had a short-term payment deferral related to the pandemic since March 1, 2020, as long as those loans were current and risk rated as “pass” as of December 31, 2019. (d) Subsequent Events The Company has evaluated subsequent events and transactions from September 30, 2020 through the date this Form 10-Q was filed with the SEC for potential recognition or disclosure as required by GAAP and determined that other than the item noted below, there were no material subsequent events requiring recognition or disclosure. In late October 2020, management determined that it was prudent to downgrade the credit rating on a large commercial real estate relationship from pass credit risk rated to substandard and to classify as TDR non-accrual. This financing is in a previously identified industry considered to be most at-risk from the impact of the pandemic and had previous short-term modifications. The relationship was not able to resume contractual payments upon expiration and subsequently requested, and was granted, an additional principal and interest deferral in late October 2020. Interest income of approximately $313 thousand, related to this $15.2 million relationship will be reversed in the fourth quarter. (e) Recent Accounting Pronouncements The tables below summarize recent accounting pronouncements issued by the FASB that were either recently adopted by the Company or have not yet been adopted. For pronouncements not yet adopted, the effective date listed below is in line with the required adoption date for public business entities, such as the Company, though certain accounting pronouncements may permit early adoption. For more detailed information regarding these pronouncements, refer to the FASB's ASUs. Accounting pronouncements adopted by the Company Standard/Adoption Date Description Effect on Financial Statements or Other Significant Matters ASU No. 2018-13, Fair Value Measurement January 1, 2020 The amendments in this ASU modify the disclosure requirements related primarily to level 3 fair value measurements of the fair value hierarchy. The adoption of ASU No. 2018-13 in January 2020 did not have a material impact on the Company's consolidated financial statements and results of operations because this ASU relates primarily to disclosure requirements and the dollar amounts of related assets held by the Company are immaterial. ASU No.2018-15, Intangibles-Goodwill and Other- Internal-Use Software (ASU Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract January 1, 2020 The major provision in the amendments in this ASU requires an entity to capitalize certain implementation costs incurred in a hosting arrangement that is a service contract in accordance with current GAAP for internal-use software and expense these costs over the term of the hosting arrangement. Additionally, these capitalized implementation costs are required to be reviewed for impairment in accordance with current GAAP for internal-use software. The amendments in this ASU should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The adoption of ASU No. 2018-15 in January 2020 did not have a material impact on the Company's consolidated financial statements and results of operations. ASU No. 2020-04. Reference Rate Reform (Topic 848) - Facilitation of the Effects of Reference Rate Reform on Financial Reporting Upon Issuance The amendments in the provision are effective for a limited period and mainly address accounting and reporting challenges due to the transition from LIBOR on existing contracts. The optional expedients may be applied to loans, borrowings, leases and derivatives. The standard 1) simplifies the accounting analyses for contract modifications and 2) simplifies the hedge effectiveness assessment and allows hedging relationships impacted by the LIBOR transition to continue. This ASU was effective upon issuance and is applicable until December 31, 2022. The Company adopted this ASU prospectively and made certain optional elections related to its cashflow hedge relationships which did not materially impact our consolidated financial statements. The Company continues to assess the other implications and expedients under this standard, which allows for elections to be made at different time intervals, but does not expect that the ASU will have a material impact on the Company's consolidated financial statements, or results of operations. Accounting pronouncements not yet adopted by the Company Standard/Anticipated Adoption Date Description Effect on Financial Statements or Other Significant Matters ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments The earlier of (1) the date on which the national emergency concerning the pandemic declared by the National Emergencies Act terminates; or (2) December 31, 2020. The amendments in this ASU require a financial asset (or a group of financial assets) measured on an amortized cost basis to be presented at the net amount expected to be collected. Previously, when credit losses were measured under GAAP, an entity generally only considered past events and current conditions in measuring the incurred loss and generally recognition of the full amount of credit losses was delayed until the loss was probable of occurring. The amendments in this ASU eliminate the probable initial recognition threshold in current GAAP and, instead, reflect an entity's current estimate of CECL. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the report amount. An entity must use judgment in determining the relevant information and estimation methods that are appropriate in its circumstances. The Statement of Income reflects the measurement of credit losses for newly recognized financial assets, as well as the expected increases or decreases of expected credit losses that have taken place during the period. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial asset(s) to present the net carrying value at the amount expected to be collected on the financial asset. In accordance with the CARES Act, the Company elected to defer the adoption of this standard. The Company continues to monitor regulatory guidance related to this deferment. As of September 30, 2020, the Company estimates adoption of CECL would have increased the total allowance for loan losses (credit losses under CECL), including the reserves for unfunded commitments by $8.0 million to $11.0 million and increased the total allowance for credit losses to total loans ratio from 1.65% to a range of 1.95% to 2.06%, excluding Paycheck Protection Program ("PPP") loans that are SBA guaranteed and are estimated to have nominal credit risk. CECL will be adopted with an effective retrospective implementation date of January 1, 2020. Included in the estimated total increase in the allowance for credit losses is approximately pre-tax $3.0 million that will be recorded through equity, net of taxes, as the CECL day one implementation adjustment and pre-tax $5.0 million to $8.0 million that will be recorded through earnings and applied retrospectively to the applicable March 31, June 30, and September 30 quarterly results. In March 2020, the regulatory banking agencies issued an interim final rule that allows banking institutions that implement CECL during 2020 to delay for two years the estimated impact of CECL on regulatory capital, followed by a three-year transition period. The Company is currently assessing its options at this time and will make its election when it adopts CECL. The foregoing observations are subject to change as management completes its analysis and adopts the standard later this year. ASU No. 2018-14, Compensation-Retirement Benefits-Defined Benefit Plans-General (ASU Subtopic 715-20) - Disclosure Framework- Changes to the Disclosure Requirements for Defined Benefit Plans January 1, 2021 The amendments in this ASU modify the disclosure requirements on defined benefit plans including requiring disclosures about significant gains and losses related to changes in the benefit obligation. The adoption of ASU No. 2018-14 will not have a material impact on the Company's consolidated financial statements and results of operations because this ASU relates primarily to disclosure requirements and the balances of the benefit plans impacted by this ASU are immaterial to the Company.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities As of September 30, 2020, and December 31, 2019, the Company's investment portfolio was comprised primarily of debt securities, with a small portion of the portfolio invested in equity securities. See also the section "Restricted Cash and Investments," under Item (c), "Accounting Policies," contained in Note 1, "Summary of Significant Accounting Policies," above in this Form 10-Q, for further information regarding the Company's investment in FHLB stock. See Note 14, "Fair Value Measurements," of this Form 10-Q, contained below, for further information regarding the Company's fair value measurements for investment securities. Debt Securities All of the Company's debt securities were classified as available-for-sale and carried at fair value. The amortized cost and fair values of debt securities at the dates specified are summarized as follows: September 30, 2020 (Dollars in thousands) Amortized Unrealized Unrealized Fair Value Residential federal agency MBS (1) $ 178,022 $ 6,717 $ 143 $ 184,596 Commercial federal agency MBS (1) 107,142 8,103 — 115,245 Taxable municipal securities 79,868 8,622 — 88,490 Tax-exempt municipal securities 90,239 7,013 — 97,252 Corporate bonds 11,051 846 — 11,897 Total debt securities, at fair value $ 466,322 $ 31,301 $ 143 $ 497,480 December 31, 2019 (Dollars in thousands) Amortized Unrealized Unrealized Fair Value Federal agency obligations (1) $ 999 $ 5 $ — $ 1,004 Residential federal agency MBS (1) 190,392 2,599 333 192,658 Commercial federal agency MBS (1) 111,182 3,453 — 114,635 Taxable municipal securities 79,095 2,726 134 81,687 Tax-exempt municipal securities 95,342 4,696 — 100,038 Corporate bonds 13,826 485 — 14,311 CDs (2) 454 1 — 455 Total debt securities, at fair value $ 491,290 $ 13,965 $ 467 $ 504,788 __________________________________________ (1) These categories may include investments issued or guaranteed by government sponsored enterprises such as Fannie Mae ("FNMA"), Freddie Mac ("FHLMC"), Federal Farm Credit Bank ("FFCB"), or one of several Federal Home Loan Banks, as well as investments guaranteed by Ginnie Mae ("GNMA"), a wholly-owned government entity. (2) CDs represent term deposits issued by banks that are subject to FDIC insurance and purchased on the open market. As of the dates reflected in the tables above, the majority of investments in the residential and commercial federal agency mortgage back securities ("MBS") categories were collateralized mortgage obligations ("CMOs") issued by U.S. government agencies. The remaining MBS investments totaled $20.6 million and $23.5 million at September 30, 2020 and December 31, 2019, respectively. Net unrealized appreciation and depreciation on debt securities available-for-sale, net of applicable income taxes, are reflected as a component of accumulated other comprehensive income (loss). The net unrealized gain or loss in the Company's debt security portfolio fluctuates as market interest rates rise and fall. Due to the fixed rate nature of this portfolio, as market rates fall, the value of the portfolio rises, and as market rates rise, the value of the portfolio declines. The unrealized gains or losses on debt securities will also decline as the securities approach maturity. Unrealized losses on debt securities that are deemed OTTI are generally charged to earnings, as described further in Note 1, "Summary of Significant Accounting Policies," under Item (e), "Investments," to the Company's audited consolidated financial statements contained in the Company's 2019 Annual Report on Form 10-K. Gains or losses will be recognized in the Consolidated Statement of Income if the debt securities are sold. The following tables summarize debt securities with unrealized losses, due to the fair values having declined below the amortized costs of the individual investments, by the duration of their continuous unrealized loss positions at September 30, 2020 and December 31, 2019: September 30, 2020 Less than 12 months 12 months or longer Total (Dollars in thousands) Fair Unrealized Fair Unrealized Fair Unrealized # of holdings Residential federal agency MBS $ 15,433 $ 143 $ — $ — $ 15,433 $ 143 5 Total temporarily impaired debt securities $ 15,433 $ 143 $ — $ — $ 15,433 $ 143 5 December 31, 2019 Less than 12 months 12 months or longer Total (Dollars in thousands) Fair Unrealized Fair Unrealized Fair Unrealized # of holdings Residential federal agency MBS $ 36,464 $ 263 $ 5,060 $ 70 $ 41,524 $ 333 11 Taxable municipal securities 16,826 134 — — 16,826 134 15 Total temporarily impaired debt securities $ 53,290 $ 397 $ 5,060 $ 70 $ 58,350 $ 467 26 Management regularly reviews the portfolio for debt securities with unrealized losses that are other-than-temporarily impaired. During the nine months ended September 30, 2020 and 2019, the Company did not record any OTTI on its investments in debt securities and at September 30, 2020, management did not consider any debt securities to have OTTI. There have been no material changes to the Company's process for assessing investments for OTTI as reported in the Company's 2019 Annual Report on Form 10-K. For more information about the Company's assessment for OTTI, see Note 2, "Investment Securities," to the Company's audited consolidated financial statements contained in the Company's 2019 Annual Report on Form 10-K. The contractual maturity distribution at September 30, 2020 of debt securities was as follows: (Dollars in thousands) Amortized Cost Fair Value Due in one year or less $ 8,202 $ 8,250 Due after one, but within five years 96,187 103,196 Due after five, but within ten years 147,763 162,303 Due after ten years 214,170 223,731 Total debt securities $ 466,322 $ 497,480 Scheduled contractual maturities shown above may not reflect the actual maturities of the investments. The actual MBS/CMO cash flows likely will be faster than presented above due to prepayments and amortization. Similarly, included in the table above are callable securities, comprised of municipal securities and corporate bonds, with a fair value of $87.1 million, which can be redeemed by the issuers prior to the maturity presented above. Management considers these factors when evaluating the interest-rate risk in the Company's asset-liability management program. From time to time, the Company may pledge debt securities as collateral for deposit account balances of municipal customers, and for borrowing capacity with the FHLB and the Federal Reserve Bank of Boston ("FRB"). The fair value of debt securities pledged as collateral for these purposes was $497.5 million at September 30, 2020. Sales of debt securities for the three and nine months ended September 30, 2020 and September 30, 2019 are summarized as follows: Three months ended September 30, Nine months ended September 30, (Dollars in thousands) 2020 2019 2020 2019 Amortized cost of debt securities sold (1) $ 3,153 $ — $ 5,680 $ 11,621 Gross realized gains on sales 127 — 227 149 Gross realized losses on sales — — — (3) Total proceeds from sales of debt securities $ 3,280 $ — $ 5,907 $ 11,767 _________________________________________ (1) Amortized cost of investments sold is determined on a specific identification basis and includes pending trades based on trade date, if applicable. Equity Securities Equity securities are accounted for under ASC Topic 321, "Investments-Equity Securities," and are recorded on the Company's consolidated balance sheet at fair value with changes in fair value recognized in the Company's Consolidated Statement of Income as a component of "Other Income." The amount related to equity securities fair value adjustments recognized in "Other income" is dependent primarily on the amount of dollars invested in equities and the magnitude of changes in equity market values. The Company held equity securities with a fair value of $651 thousand at September 30, 2020 and $467 thousand at December 31, 2019. At September 30, 2020, the equity portfolio consisted primarily of investments in common stock of individual entities in the financial services industry and mutual funds held in conjunction with the Company's supplemental executive retirement and deferred compensation plan. Gains and losses on equity securities for the three and nine months ended September 30, 2020 and September 30, 2019 are summarized as follows: Three months ended September 30, Nine months ended September 30, (Dollars in thousands) 2020 2019 2020 2019 Net gains (losses) recognized during the period on equity securities $ (3) $ 12 $ (135) $ 275 Less: Net losses recognized on equity securities sold during the period — 36 (11) 36 Unrealized gains (losses) recognized during the reporting period on equity securities still held at the end of the period $ (3) $ (24) $ (124) $ 239

Loans

Loans	9 Months Ended
	Sep. 30, 2020
Receivables [Abstract]
Loans	LoansThe Company manages its loan portfolio to avoid concentration by industry, relationship size and source of repayment to lessen its credit risk exposure. For additional information on the Company's lending products, see the heading "Lending Products" under Item 1, "Business," contained in the Company's 2019 Annual Report on Form 10-K. Loan Portfolio Classifications Major classifications of loans at the dates indicated were as follows: (Dollars in thousands) September 30, December 31, Commercial real estate $ 1,490,649 $ 1,394,179 Commercial and industrial 435,856 501,227 Commercial construction 384,121 317,477 SBA Paycheck Protection Program 508,196 — Total commercial loans 2,818,822 2,212,883 Residential mortgages 254,784 247,373 Home equity 84,778 98,252 Consumer 9,070 10,054 Total retail loans 348,632 355,679 Gross loans 3,167,454 2,568,562 Deferred loan origination fees, net (3,144) (3,103) Deferred PPP fees (13,495) — Total loans 3,150,815 2,565,459 Allowance for loan losses (43,835) (33,614) Net loans $ 3,106,980 $ 2,531,845 Commercial loans originated by other banks in which the Company is a participating institution are carried at the pro-rata share of ownership and amounted to $103.6 million at September 30, 2020 and $104.3 million at December 31, 2019. See also "Loans serviced for others" below for information related to commercial loans participated out to various other institutions. Paycheck Protection Program The PPP was established by the CARES Act and implemented by the Small Business Administration (“SBA”) with support from the Department of the Treasury. The PPP began in early April 2020 and the deadline for submission of PPP loan applications was August 8, 2020. The PPP is a federally guaranteed, low-interest rate loan program designed to provide a direct incentive for small businesses to keep workers on the payroll. Businesses may use PPP loan funds to pay payroll costs as well as to cover other eligible business expenses. PPP loans may be partially or fully forgiven by the SBA if the funds are used for eligible expenses during the relevant 8 or 24 week "covered forgiveness period" and the borrower meets the employee retention criteria. The PPP loans carry an interest rate of 1% to be paid by either the SBA, in the event of forgiveness, or by the borrower for the term of the loan, which may be 2 years or 5 years. The PPP loans that the SBA approved on or after June 5, 2020 will have a maturity date of 5 years. Payments for PPP loans are deferred until the SBA issues a forgiveness decision or ten months after the end of the covered forgiveness period if the borrower fails to apply for forgiveness during that period. Borrowers may submit a loan forgiveness application any time before the maturity date of the loan. All PPP loans are fully guaranteed by the SBA and are included in total loans outstanding. As of September 30, 2020, the Company had 2,758 PPP loans outstanding totaling $508.2 million. As of September 30, 2020, the SBA had not issued any forgiveness determinations to the Bank's PPP borrowers. In addition to generating interest income, the SBA pays lender’s fees for processing PPP loans. As of September 30, 2020, the Company has recorded $17.2 million in PPP related SBA fees and is accreting these fees into interest income over the life of the applicable loans. If a PPP loan is forgiven or paid off before maturity, the remaining unearned fee is recognized into income at that time. Year-to-date through September 30, 2020, the Company has recognized $3.7 million in PPP related SBA fees through accretion. Loans serviced for others At September 30, 2020 and December 31, 2019, the Company was servicing residential mortgage loans owned by investors amounting to $14.8 million and $15.7 million, respectively. Additionally, the Company was servicing commercial loans originated by the Company and participated out to various other institutions amounting to $75.7 million and $80.2 million at September 30, 2020 and December 31, 2019, respectively. Loans serving as collateral Loans designated as qualified collateral and pledged to the FHLB for borrowing capacity as of the dates indicated are summarized below: (Dollars in thousands) September 30, December 31, Commercial real estate $ 208,970 $ 246,865 Residential mortgages 237,096 231,028 Home equity 6,748 7,676 Total loans pledged to FHLB $ 452,814 $ 485,569

Allowance For Loan Losses

Allowance For Loan Losses	9 Months Ended
	Sep. 30, 2020
Receivables [Abstract]
Allowance for Loan Loss	Allowance for Loan Losses Allowance for probable loan losses methodology On a quarterly basis, management prepares an estimate of the allowance necessary to cover estimated probable credit losses. The Company uses a systematic methodology to measure the amount of estimated loan loss exposure inherent in the portfolio for purposes of establishing a sufficient allowance for loan losses. The methodology makes use of specific reserves for loans individually evaluated and deemed impaired, and general reserves for larger pools of homogeneous loans, which are collectively evaluated relying on a combination of qualitative and quantitative factors that may affect credit quality of the pool. There have been no material changes to the Company's underwriting practices, credit risk management system, or to the allowance assessment methodology used to estimate loan loss exposure however, due to the economic uncertainty from the pandemic, management has strengthened risk management over new originations and existing credits. See Note 4, "Allowance for Loan Losses," to the Company's audited consolidated financial statements contained the 2019 Annual Report on Form 10-K. The Company has elected to delay the adoption of CECL in accordance with the CARES Act, which allows Companies to delay adoption until the earlier of: (1) the date on which the national emergency concerning the pandemic declared under the National Emergencies Act terminates; or (2) December 31, 2020. The information that follows is presented under the incurred loss model. The balances of loans as of September 30, 2020 by portfolio classification and evaluation method are summarized as follows: (Dollars in thousands) Loans individually Loans collectively Gross Loans Commercial real estate $ 16,190 $ 1,474,459 $ 1,490,649 Commercial and industrial 8,964 426,892 435,856 Commercial construction 6,121 378,000 384,121 SBA PPP loans — 508,196 508,196 Residential mortgages 604 254,180 254,784 Home equity 399 84,379 84,778 Consumer 31 9,039 9,070 Total gross loans $ 32,309 $ 3,135,145 $ 3,167,454 The balances of loans as of December 31, 2019 by portfolio classification and evaluation method are summarized as follows: (Dollars in thousands) Loans individually Loans collectively Gross Loans Commercial real estate $ 17,515 $ 1,376,664 $ 1,394,179 Commercial and industrial 9,332 491,895 501,227 Commercial construction 3,347 314,130 317,477 Residential mortgages 1,229 246,144 247,373 Home equity 411 97,841 98,252 Consumer 44 10,010 10,054 Total gross loans $ 31,878 $ 2,536,684 $ 2,568,562 Credit quality indicators Early detection of credit issues is critical to minimize credit losses. Accordingly, management regularly monitors internal credit quality indicators such as, among others, the risk classification of adversely classified loans, past due and non-accrual loans, impaired and restructured loans, and the level of foreclosure activity. These credit quality indicators are discussed below. See also Note 1, "Subsequent Events," of this Form 10-Q, for additional information regarding non-accrual, impaired and troubled debt restructured loans. Adversely classified loans The Company's loan risk rating system classifies loans depending on risk of loss characteristics. The classifications range from "substantially risk free" for the highest quality loans and loans that are secured by cash collateral, through a satisfactory range of "minimal," "moderate," "better than average," and "average" risk, to the regulatory problem-asset classifications of "criticized," for loans that may need additional monitoring, and the more severe adverse classifications of "substandard," "doubtful," and "loss" based on criteria established under banking regulations. Loans which are evaluated to be of weaker credit quality are placed on the "watch credit list" and reviewed on a more frequent basis by management. Adversely classified loans may be accruing or in non-accrual status and may be additionally designated as impaired or restructured, or some combination thereof. The following tables present the Company's credit risk profile for each portfolio classification by internally assigned adverse risk rating category as of the periods indicated: September 30, 2020 Adversely Classified Not Adversely (Dollars in thousands) Substandard Doubtful Loss Classified Gross Loans Commercial real estate $ 20,086 $ — $ — $ 1,470,563 $ 1,490,649 Commercial and industrial 9,215 2,303 — 424,338 435,856 Commercial construction 6,625 — — 377,496 384,121 SBA PPP loans — — — 508,196 508,196 Residential mortgages 481 — — 254,303 254,784 Home equity 481 — — 84,297 84,778 Consumer 54 — — 9,016 9,070 Total gross loans $ 36,942 $ 2,303 $ — $ 3,128,209 $ 3,167,454 December 31, 2019 Adversely Classified Not Adversely (Dollars in thousands) Substandard Doubtful Loss Classified Gross Loans Commercial real estate $ 16,664 $ — $ — $ 1,377,515 $ 1,394,179 Commercial and industrial 10,900 2,370 — 487,957 501,227 Commercial construction 4,836 — — 312,641 317,477 Residential mortgages 1,825 — — 245,548 247,373 Home equity 455 — — 97,797 98,252 Consumer 69 3 — 9,982 10,054 Total gross loans $ 34,749 $ 2,373 $ — $ 2,531,440 $ 2,568,562 Total adversely classified loans amounted to 1.25% of total loans at September 30, 2020, compared to 1.45% at December 31, 2019. Past due and non-accrual loans The following tables present an age analysis of past due loans by portfolio classification as of the dates indicated: Balance at September 30, 2020 (Dollars in thousands) 30-59 Days 60-89 Days Past Due 90 days or more Total Past Current Loans Gross Non-accrual Loans Commercial real estate $ 1,439 $ 375 $ 5,954 $ 7,768 $ 1,482,881 $ 1,490,649 $ 9,719 Commercial and industrial 285 227 753 1,265 434,591 435,856 4,981 Commercial construction 14,929 — 4,116 19,045 365,076 384,121 6,121 SBA PPP loans — — — — 508,196 508,196 — Residential mortgages 325 297 — 622 254,162 254,784 409 Home equity 49 — 269 318 84,460 84,778 399 Consumer 3 — — 3 9,067 9,070 12 Total gross loans $ 17,030 $ 899 $ 11,092 $ 29,021 $ 3,138,433 $ 3,167,454 $ 21,641 Balance at December 31, 2019 (Dollars in thousands) 30-59 Days 60-89 Days Past Due 90 days or more Total Past Current Loans Gross Loans Non-accrual Loans Commercial real estate $ 1,469 $ 3,914 $ 4,158 $ 9,541 $ 1,384,638 $ 1,394,179 $ 8,280 Commercial and industrial 576 1,034 265 1,875 499,352 501,227 3,285 Commercial construction 576 3,325 1,735 5,636 311,841 317,477 1,735 Residential mortgages 700 283 623 1,606 245,767 247,373 411 Home equity 645 — 169 814 97,438 98,252 1,040 Consumer 12 — 6 18 10,036 10,054 20 Total gross loans $ 3,978 $ 8,556 $ 6,956 $ 19,490 $ 2,549,072 $ 2,568,562 $ 14,771 At September 30, 2020 and December 31, 2019, all loans past due 90 days or more were carried as non-accrual, in addition to those loans that were less than 90 days past due where reasonable doubt existed as to the full and timely collection of interest or principal that have also been designated as non-accrual, despite their payment due status shown in the tables above. Non-accrual loans that were not adversely classified amounted to $184 thousand at September 30, 2020 and $84 thousand at December 31, 2019. These balances primarily represented the guaranteed portions of non-performing SBA loans. The majority of the non-accrual loan balances were also carried as impaired loans during the periods noted and are discussed further below. The ratio of non-accrual loans to total loans amounted to 0.69% at September 30, 2020 and 0.58% and at December 31, 2019. At September 30, 2020, additional funding commitments for non-accrual loans were $1.2 million. At September 30, 2020, short term payment deferrals related to the COVID-19 pandemic were active on 178 loans amounting to $104.1 million, or 3% of the Company's loan portfolio; these loans remain on accrual status. Impaired loans Impaired loans are individually significant loans for which management considers it probable that not all amounts due (principal and interest) will be collected in accordance with the original contractual terms. Impaired loans include loans that have been modified in a TDR, see "Troubled Debt Restructurings" below. Impaired loans are individually evaluated and exclude large groups of smaller-balance homogeneous loans, such as residential mortgage loans and consumer loans, which are collectively evaluated for impairment, and loans that are measured at fair value, unless the loan is amended in a TDR. The carrying value of impaired loans amounted to $32.3 million and $31.9 million at September 30, 2020 and December 31, 2019, respectively. Total accruing impaired loans amounted to $10.7 million and $17.1 million at September 30, 2020 and December 31, 2019, respectively, while non-accrual impaired loans amounted to $21.6 million and $14.8 million as of September 30, 2020 and December 31, 2019, respectively. The following tables set forth the recorded investment in impaired loans and the related specific allowance allocated by portfolio classification as of the dates indicated: Balance at September 30, 2020 (Dollars in thousands) Unpaid Total recorded Recorded Recorded Related specific Commercial real estate $ 17,348 $ 16,190 $ 15,908 $ 282 $ 18 Commercial and industrial 11,055 8,964 5,054 3,910 2,890 Commercial construction 6,249 6,121 3,510 2,611 1,651 SBA PPP loans — — — — — Residential mortgages 704 604 604 — — Home equity 560 399 399 — — Consumer 32 31 — 31 31 Total $ 35,948 $ 32,309 $ 25,475 $ 6,834 $ 4,590 Balance at December 31, 2019 (Dollars in thousands) Unpaid Total recorded Recorded Recorded Related specific Commercial real estate $ 18,537 $ 17,515 $ 17,129 $ 386 $ 31 Commercial and industrial 11,455 9,332 7,405 1,927 974 Commercial construction 3,359 3,347 3,347 — — Residential mortgages 1,331 1,229 1,229 — — Home equity 607 411 411 — — Consumer 44 44 — 44 44 Total $ 35,333 $ 31,878 $ 29,521 $ 2,357 $ 1,049 The following table presents the average recorded investment in impaired loans by portfolio classification and the related interest recognized during the three months indicated: Three months ended September 30, 2020 Three months ended September 30, 2019 (Dollars in thousands) Average recorded Interest income Average recorded Interest income Commercial real estate $ 16,002 $ 66 $ 17,828 $ 140 Commercial and industrial 9,208 50 10,886 85 Commercial construction 7,180 17 1,732 26 SBA PPP loans — — — — Residential mortgages 700 2 1,034 (2) Home equity 434 — 427 — Consumer 36 — 29 1 Total $ 33,560 $ 135 $ 31,936 $ 250 The following table presents the average recorded investment in impaired loans by portfolio classification and the related interest recognized during the nine months indicated: Nine months ended September 30, 2020 Nine months ended September 30, 2019 (Dollars in thousands) Average recorded Interest income Average recorded Interest income recognized Commercial real estate $ 15,188 $ 208 $ 16,685 $ 382 Commercial and industrial 8,560 118 11,426 294 Commercial construction 6,537 22 1,735 78 SBA PPP loans — — — — Residential mortgages 939 6 954 16 Home equity 418 (1) 457 — Consumer 39 1 24 — Total $ 31,681 $ 354 $ 31,281 $ 770 At September 30, 2020, additional funding commitments for impaired loans were $1.2 million. Troubled debt restructurings Loans are designated as a TDR when, as part of an agreement to modify the original contractual terms of the loan as a result of financial difficulties of the borrower, the Company grants the borrower a concession on the terms that would not otherwise be considered. Typically, such concessions may consist of one or a combination of the following: a reduction in interest rate to a below market rate, taking into account the credit quality of the note; extension of additional credit based on receipt of adequate collateral; or a deferment or reduction of payments (principal or interest) which materially alters the Company's position or significantly extends the note's maturity date, such that the present value of cash flows to be received is materially less than those contractually established at the loan's origination. All loans that are modified are reviewed by the Company to identify if a TDR has occurred. All TDR loans are included in the impaired loan category and, as such, these loans are individually reviewed and evaluated, and a specific reserve is assigned for the amount of the estimated probable credit loss. Total TDR loans, included in the impaired loan balances above, as of September 30, 2020 and December 31, 2019, were $18.0 million and $21.1 million, respectively. TDR loans on accrual status amounted to $10.7 million and $17.1 million at September 30, 2020 and December 31, 2019, respectively. TDR loans included in non-performing loans amounted to $7.3 million at September 30, 2020 and $4.0 million at December 31, 2019. The Company continues to work with customers and enters into loan modifications (which may or may not be TDRs) to the extent deemed to be necessary or appropriate while attempting to achieve the best mutual outcome given the individual financial circumstances and future prospects of the borrower. The following table sets forth the post modification balances of TDRs listed by type of modification for TDRs that occurred during the nine month periods indicated: Nine months ended September 30, 2020 September 30, 2019 (Dollars in thousands) Number of Amount Number of Amount Extended maturity date 2 $ 1,145 — $ — Temporary payment reduction and payment re-amortization of remaining principal over extended term 6 1,599 8 49 Temporary interest only payment plan — — 3 386 Forbearance of post default rights 4 2,070 — — Other payment concessions — — 4 1,773 Total 12 $ 4,814 15 $ 2,208 Amount of specific reserves included in the allowance for loan losses associated with TDRs listed above $ 1,240 $ 72 The following table presents number and balance of loans modified as TDRs, by portfolio classification, during the three months indicated: Three months ended September 30, 2020 September 30, 2019 (Dollars in thousands) Number of Pre-modification Post-modification Number of Pre-modification Post-modification Commercial real estate 1 $ 217 $ 215 — $ — $ — Commercial and industrial 3 410 413 2 22 22 Commercial construction — — — — — — SBA PPP loans — — — — — — Residential mortgages — — — — — — Home equity loans and lines — — — — — — Consumer — — — 1 7 7 Total 4 $ 627 $ 628 3 $ 29 $ 29 At September 30, 2020, additional funding commitments for TDR loans were not material. The following table presents loans modified as TDRs within the preceding twelve months, which have defaulted on the modified terms during the during the three months indicated: Three months ended September 30, 2020 September 30, 2019 (Dollars in thousands) Number of TDRs that defaulted Post- Number of TDRs that defaulted Post- Commercial real estate — $ — 1 $ 1,400 Commercial and industrial 2 327 2 62 Commercial construction 2 1,510 — — SBA PPP loans — — — — Residential mortgages — — 1 311 Home equity loans and lines — — — — Consumer — — 1 5 Total 4 $ 1,837 5 $ 1,778 The following table presents number and balance of loans modified as TDRs, by portfolio classification, during the nine months indicated: Nine months ended September 30, 2020 September 30, 2019 (Dollars in thousands) Number of Pre-modification Post-modification Number of Pre-modification Post-modification Commercial real estate 1 $ 217 $ 215 3 $ 2,047 $ 1,623 Commercial and industrial 4 884 672 9 428 261 Commercial construction 6 4,754 3,927 — — — SBA PPP loans — — — — — — Residential mortgages — — — 1 315 311 Home equity — — — — — — Consumer 1 1 — 2 13 13 Total 12 $ 5,856 $ 4,814 15 $ 2,803 $ 2,208 There were no subsequent charge-offs associated with the new TDRs noted in the table above during the nine months ended September 30, 2020 or September 30, 2019. The following table presents loans modified as TDRs within the preceding twelve months, which have defaulted on the modified terms during the nine months indicated: Nine months ended September 30, 2020 September 30, 2019 (Dollars in thousands) Number of TDRs that defaulted Post- Number of TDRs that defaulted Post- Commercial real estate — $ — 1 $ 1,400 Commercial and industrial 4 391 4 233 Commercial construction 4 2,655 — — SBA PPP loans — — — — Residential mortgages — — 1 311 Home equity — — — — Consumer 1 — 1 5 Total 9 $ 3,046 7 $ 1,949 See "Financial Condition" in Item 2, "Management's Discussion and Analysis of Financial Condition and Results of Operations," under the headings "Credit Risk" and "Allowance for Loan Losses" in this Form 10-Q for additional information about changes in the Company's credit quality indicators since December 31, 2019. Allowance for loan loss activity The allowance for loan losses is an estimate of probable credit losses inherent in the loan portfolio as of the specified balance sheet dates. On a quarterly basis, management prepares an estimate of the allowance necessary to cover estimated probable credit losses. The Company maintains the allowance at a level that it deems adequate to absorb all reasonably anticipated probable losses from specifically known and other credit risks associated with the portfolio. The allowance for loan losses is established through a provision for loan losses, a direct charge to earnings. Loan losses are charged against the allowance when management believes that the collectability of the loan principal is unlikely. Recoveries on loans previously charged-off are credited to the allowance. The allowance for loan losses amounted to $43.8 million at September 30, 2020, compared to $33.6 million at December 31, 2019, and $33.9 million at September 30, 2019. The allowance for loan losses to total loans ratio was 1.39% at September 30, 2020, 1.31% at December 31, 2019, and 1.37% at September 30, 2019. Based on management's judgment as to the existing credit risks inherent in the loan portfolio, as discussed above under the heading "Credit Quality Indicators," management believes that the Company's allowance for loan losses is adequate to absorb probable losses from specifically known and other probable credit risks associated with the portfolio as of September 30, 2020. For the nine months ended September 30, 2020, the provision for loan losses amounted to $10.4 million, compared to $1.6 million for the nine months ended September 30, 2019. The provision for the nine months ended September 30, 2020 consisted of $6.3 million in general reserve factor increases related primarily to economic weakness caused by the pandemic and its impact on credit quality in the loan portfolio, $3.1 million related to classified and impaired loans and $1.0 million related to loan growth and other factors. Changes in the allowance for loan losses by portfolio classification for the three months ended September 30, 2020 are presented below: (Dollars in thousands) Cmml Real Cmml and Cmml Resid. Home Consumer Total Beginning Balance at June 30, 2020 $ 22,477 $ 9,763 $ 7,498 $ 1,728 $ 613 $ 245 $ 42,324 Provision 1,159 489 73 (59) (67) (20) 1,575 Recoveries — 33 — — 4 9 46 Less: Charge offs — 103 — — — 7 110 Ending Balance at September 30, 2020 $ 23,636 $ 10,182 $ 7,571 $ 1,669 $ 550 $ 227 $ 43,835 Changes in the allowance for loan losses by portfolio classification for the nine months ended September 30, 2020 are presented below: (Dollars in thousands) Cmml Real Cmml and Cmml Resid. Home Consumer Total Beginning Balance at December 31, 2019 $ 18,338 $ 9,129 $ 4,149 $ 1,195 $ 536 $ 267 $ 33,614 Provision 5,298 1,248 3,422 474 4 (49) 10,397 Recoveries — 207 — — 10 34 251 Less: Charge offs — 402 — — — 25 427 Ending Balance at September 30, 2020 $ 23,636 $ 10,182 $ 7,571 $ 1,669 $ 550 $ 227 $ 43,835 Ending allowance balance: Allocated to loans individually evaluated for impairment $ 18 $ 2,890 $ 1,651 $ — $ — $ 31 $ 4,590 Allocated to loans collectively evaluated for impairment $ 23,618 $ 7,292 $ 5,920 $ 1,669 $ 550 $ 196 $ 39,245 Changes in the allowance for loan losses by portfolio classification for the three months ended September 30, 2019 are presented below: (Dollars in thousands) Cmml Real Cmml and Cmml Resid. Home Consumer Total Beginning Balance at June 30, 2019 $ 17,828 $ 10,731 $ 3,717 $ 1,187 $ 629 $ 259 $ 34,351 Provision 174 357 491 (6) (3) 12 1,025 Recoveries — 114 — — 2 12 128 Less: Charge offs — 1,533 — — — 36 1,569 Ending Balance at September 30, 2019 $ 18,002 $ 9,669 $ 4,208 $ 1,181 $ 628 $ 247 $ 33,935 Changes in the allowance for loan losses by portfolio classification for the nine months ended September 30, 2019 are presented below: (Dollars in thousands) Cmml Real Cmml and Cmml Resid. Home Consumer Total Beginning Balance at December 31, 2018 $ 18,014 $ 10,493 $ 3,307 $ 1,160 $ 629 $ 246 $ 33,849 Provision (12) 598 901 21 (8) 80 1,580 Recoveries — 570 — — 7 25 602 Less: Charge offs — 1,992 — — — 104 2,096 Ending Balance at September 30, 2019 $ 18,002 $ 9,669 $ 4,208 $ 1,181 $ 628 $ 247 $ 33,935 Ending allowance balance: Allocated to loans individually evaluated for impairment $ 4 $ 1,088 $ — $ 2 $ — $ 25 $ 1,119 Allocated to loans collectively evaluated for impairment $ 17,998 $ 8,581 $ 4,208 $ 1,179 $ 628 $ 222 $ 32,816 Other real estate owned Real estate acquired by the Company through foreclosure proceedings or the acceptance of a deed in lieu of foreclosure is classified as OREO. When property is acquired, it is recorded at estimated fair value of the property acquired, less estimated costs to sell, establishing a new cost basis and carried on the Consolidated Balance Sheet in the line item "Prepaid expenses and other assets." The estimated fair value is based on market appraisals and the Company's internal analysis. Any loan balance in excess of the estimated realizable fair value on the date of transfer is charged to the allowance for loan losses on that date. All costs incurred thereafter in maintaining the property, as well as subsequent declines in fair value are charged to non-interest expense. The Company had no OREO at September 30, 2020, December 31, 2019, or September 30, 2019. There were no OREO additions during the nine months ended September 30, 2020 and one addition during the nine months ended September 30, 2019. There were no sales, or subsequent write downs of OREO during the nine months ended September 30, 2020 compared to one sale and no subsequent write downs of OREO during the nine months ended September 30, 2019.

Leases

Leases	9 Months Ended
	Sep. 30, 2020
Leases [Abstract]
Lessee, Operating Leases	Leases For the Company, material leases consist of operating leases on our facilities, mainly branch leases; leases 12 months or less and immaterial equipment leases have been excluded. As of September 30, 2020, the Company had 15 operating real estate leases. The Company's leased facilities are contracted under various non-cancelable operating leases, most of which provide options to the Company to extend the lease periods and include periodic rent adjustments. While the Company typically exercises its option to extend lease terms, the lease contains provisions that allow the Company, upon notification, to terminate the lease at the end of the lease term, or any option period. Several real estate leases also provide the Company the right of first refusal should the property be offered for sale. Lease expenses for the three and nine months ended September 30, 2020 were $326 thousand and $974 thousand, respectively. Lease expense for the three and nine months ended September 30, 2019 were $322 thousand and $1.0 million, respectively. Variable lease costs and short-term lease expenses included in lease expense during these periods were immaterial. The weighted average remaining lease term for operating leases at September 30, 2020 and September 30, 2019 was 26.8 years and 27.5 years, respectively. The weighted average discount rate was 3.8% at September 30, 2020 and September 30, 2019. At September 30, 2020, the remaining undiscounted cash flows by year of these lease liabilities were as follows: (Dollars in thousands) Operating Leases 2020 (three remaining months) $ 330 2021 1,242 2022 1,244 2023 1,251 2024 1,256 Thereafter 23,344 Total lease payments 28,667 Less: Imputed interest 10,977 Total lease liability $ 17,690 In addition, the Company currently collects rent through non-cancellable leases for a small portion of the overall square-footage within its Lowell, Massachusetts campus headquarters and at one of its branch locations. These leases are deemed immaterial.

Deposits

Deposits	9 Months Ended
	Sep. 30, 2020
Deposits [Abstract]
Deposits	Deposits Deposits are summarized as follows: (Dollars in thousands) September 30, 2020 December 31, 2019 Non-interest checking $ 1,274,210 $ 794,583 Interest-bearing checking 539,610 467,988 Savings 255,417 203,236 Money market 1,205,350 1,009,972 CDs $250,000 or less 185,867 220,751 CDs greater than $250,000 74,611 90,200 Total customer deposits 3,535,065 2,786,730 Brokered deposits (1) 74,995 — Total deposits $ 3,610,060 $ 2,786,730 ___________________________________ (1) Brokered CDs which are $250,000 and under. Total customer deposits include reciprocal balances from checking, money market deposits and CDs received from participating banks in nationwide deposit networks as a result of our customers electing to participate in Company offered programs which allow for enhanced FDIC insurance. Essentially, the equivalent of the customers' original deposited funds comes back to the Company and are carried within the appropriate category under deposits. The Company's balances in these reciprocal products were $471.5 million and $419.7 million at September 30, 2020 and December 31, 2019, respectively. The Company's brokered deposit balance at September 30, 2020 consists of short-term brokered CDs hedged for adverse interest rate movements through interest-rate swaps.

Borrowed Funds and Subordinated

Borrowed Funds and Subordinated Debt	9 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Borrowed Funds and Subordinated Debt	Borrowed Funds and Subordinated Debt The Company's borrowed funds amounted to $1.7 million and $96.2 million at September 30, 2020 and December 31, 2019, respectively, in FHLB advances. Borrowed funds at September 30, 2020 and December 31, 2019 are summarized, as follows: September 30, 2020 December 31, 2019 (Dollars in thousands) Balance Rate Balance Rate Overnight $ — — % $ 92,000 1.85 % Within 12 months 1,216 0.42 % 3,697 2.22 % Over 5 years 463 — % 476 — % The Company's borrowings at September 30, 2020 are related to specific lending projects under the FHLB's community development program. At December 31, 2019, borrowed funds, excluding overnight advances, also related to the specific lending projects noted above. The Company also had outstanding subordinated debt (net of deferred issuance costs) of $73.7 million and $14.9 million at September 30, 2020 and December 31, 2019, respectively. In January 2015 the Company issued $15.0 million in aggregate principal amount of fixed-to-floating rate subordinated notes, with a 15-year term and currently callable by the Company at a premium. Original debt issuance costs were $190 thousand and have been netted against the subordinated debt on the consolidated balance sheet in accordance with accounting guidance. These costs are being amortized to interest expense over the life of the notes. The notes are intended to qualify as Tier 2 capital for regulatory purposes and pay interest at a fixed rate of 6.00% per annum through January 30, 2025, after which floating rates apply. On July 7, 2020, the Company issued $60.0 million in fixed-to-floating rate subordinated notes, with a 10-year term and callable at the Company's option on or after July 15, 2025. Original debt issuance costs were $1.2 million and have been netted against the subordinated debt on the consolidated balance sheet in accordance with accounting guidance. These costs are being amortized to interest expense over the life of the notes. The notes are intended to qualify as Tier 2 capital for regulatory purposes and pay interest at a fixed rate of 5.25% per annum through October 15, 2025, after which floating rates apply. Refer to Note 8, "Borrowed Funds and Subordinated Debt," to the Company's audited consolidated financial statements contained in the Company's 2019 Annual Report on Form 10-K for additional information about the Company's subordinated debt.

Derivatives and Hedging Activit

Derivatives and Hedging Activities	9 Months Ended
	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	Derivatives and Hedging Activities The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, liquidity, and credit risk primarily by managing the amount, sources, and duration of its assets and liabilities and may also, at times, use derivative financial instruments. Specifically, the Company may enter into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and unknown cash amounts, the value of which are determined by interest rates. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the earnings effect of the hedged forecasted transactions in a cash flow hedge. 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”), net of tax and subsequently reclassified into interest income or interest expense in the same period during which the hedged transaction affects earnings. Amounts reported in AOCI related to cash flow hedge derivatives will be reclassified to interest expense as interest is incurred on the Company’s hedge liability or to interest income as interest is earned on the Company's hedge asset. See Note 10, “Other Comprehensive Income (Loss),” of this Form 10-Q for additional information related to the cash flow hedges impact on the Company’s AOCI and Consolidated Statements of Income. The Company may enter into derivative contracts that are intended to economically hedge certain of its risk, even though hedge accounting does not apply, or the Company elects not to apply hedge accounting. Back-to-Back swaps are not speculative; rather, the transactions result from a service the Company provides to certain commercial customers. Back-to-Back swaps do not meet hedge accounting requirements and therefore changes in the fair value of both the customer swaps and the counterparty swaps, which have an offsetting relationship, are recognized directly in earnings. The Company records all derivatives on the balance sheet at fair value. Asset derivatives are included in the line item "Prepaid expenses and other assets," and liability derivatives are included in the "Accrued expenses and other liabilities" line item on the Consolidated Balance Sheets, respectively. In accordance with GAAP, the Company elects to measure the credit risk of its derivative financial instruments that are subject to master netting agreements by derivative type on a net basis by counterparty portfolio. The tables below present a summary of the Company's derivative financial instruments, notional amounts and fair values for the periods presented: As of September 30, 2020 (Dollars in thousands) Asset Notional Amount Asset Derivatives (1) Liability Notional Amount Liability Derivatives (1) Derivatives designated as hedging instruments Interest-rate contracts - pay fixed, receive floating $ — $ — $ 75,000 $ 3,057 Total cash flow hedge interest-rate swaps $ — $ — $ 75,000 $ 3,057 Derivatives not subject to hedge accounting Interest-rate contracts - pay floating, receive fixed $ 38,458 $ 2,821 $ — $ — Interest-rate contracts - pay fixed, receive floating — — 38,458 2,821 Total back-to-back interest-rate swaps $ 38,458 $ 2,821 $ 38,458 $ 2,821 December 31, 2019 (Dollars in thousands) Asset Notional Amount Asset Derivatives (1) Liability Notional Amount Liability Derivatives (1) Derivatives not subject to hedge accounting Interest-rate contracts - pay floating, receive fixed $ 10,502 $ 625 $ 12,273 $ 187 Interest-rate contracts - pay fixed, receive floating — — 22,775 438 Total back-to-back interest-rate swaps $ 10,502 $ 625 $ 35,048 $ 625 __________________________________________ (1) Accrued interest balances related to the Company’s interest rate swaps are not included in the fair values above and are immaterial. The Company had no derivative fair value hedges at either September 30, 2020 or December 31, 2019. Cash flow hedges Interest-rate swap agreements may be entered into as hedges against adverse interest-rate fluctuations on specifically identified assets or liabilities. The Company’s cash flow hedges are used to manage differences in the amount, timing, and duration of the Company’s known or expected cash receipts and its known or expected cash payments principally related to the Company’s wholesale funding. The Company’s objectives in using these interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. During the first quarter of 2020, the Company entered into three pay fixed, receive float interest rate swaps to hedge the variable cash flows associated with short-term wholesale funding, which may be comprised of brokered deposits and FHLB advances. Each swap has a notional value of $25.0 million with respective maturities of three years, four years and five years. At September 30, 2020, these interest rate swaps are designated as cash flow hedges and involve the receipt of variable amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. In relation to the Company's cash flow hedges, the Company estimates that an additional $947 thousand (pre-tax) will be reclassified out of AOCI as an increase to interest expense during the next twelve months. Back-to-Back swaps The Company has a "Back-to-Back Swap" program whereby the Bank enters into an interest-rate swap with qualified commercial banking customers and simultaneously enters into equal and opposite interest-rate swap with a swap counterparty. The customer interest-rate swap agreement allows commercial banking customers to convert a floating-rate loan payment to a fixed-rate payment. Each Back-to-Back swap consists of two interest-rate swaps (a customer swap and offsetting counterparty swap) and amounted to a total number of 10 interest-rate swaps outstanding at both September 30, 2020 and December 31, 2019. The transaction structure effectively minimizes the Bank's interest rate risk exposure resulting from such transactions. Customer-related credit risk is minimized by the cross collateralization of the loan and the interest-rate swap agreement to the customer's underlying collateral. Interest-rate swaps with the counterparty are subject to master netting agreements, while interest-rate swaps with customers are not. As a result of this offsetting relationship, there were no net gains or losses recognized in income on Back-to-Back swaps during the nine months ended September 30, 2020 or September 30, 2019. At September 30, 2020, all of the Back-to-Back swaps with the counterparty were in the same liability position, therefore there was no netting reflected in the Company’s Consolidated Balance Sheet. The table below presents at December 31, 2019, the Company's liability derivative positions and the potential effect of those netting arrangements on its financial position. As noted above, interest-rate swaps with customers are not subject to master netting agreements and therefore are not included in the table below. As of December 31, 2019 (Dollars in thousands) Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Liabilities Derivatives Interest-rate contracts - pay fixed, receive floating $ 625 $ 187 $ 438 Credit Risk By using derivative financial instruments, the Company exposes itself to counterparty-credit risk. Credit risk is the risk of failure by the counterparty to perform under the terms of the derivative contract. When the fair value of a derivative contract is positive, the counterparty owes the Company, which creates credit risk for the Company. When the fair value of a derivative is negative, the Company owes the counterparty and, therefore, it does not possess credit risk. The credit risk in derivative instruments is mitigated by entering into transactions with highly-rated counterparties that management believes to be creditworthy. Additionally, counterparty interest rate swaps contain provisions for collateral to be posted if the derivative exposure exceeds a threshold amount. The Company has one counterparty and it was rated A and A2 by Standard & Poor's and Moody's, respectively, at September 30, 2020. The Company had no credit risk exposure at either September 30, 2020 or December 31, 2019 relating to interest-rate swaps with counterparties. When the Company has credit risk exposure, collateral is received from the counterparty and held by the Company. Collateral held by the Company is restricted and not considered an asset of the Company. Therefore, it is not carried on the Company's Consolidated Balance Sheet. If the Company posts collateral, the cash is restricted, is considered an asset of the Company and is carried on the Company's Consolidated Balance Sheet. The Company posted cash collateral of $6.1 million and $850 thousand at September 30, 2020 and December 31, 2019, respectively. Credit-risk-related Contingent Features The Company's interest-rate swaps with counterparties contain credit-risk-related contingent provisions. These provisions provide the counterparty with the right to terminate its derivative positions and require the Company to settle its obligations under the agreements if the Company defaults on certain of its indebtedness. As of September 30, 2020, the fair value of derivatives in a net liability position, which excludes any adjustment for nonperformance risk, related to these agreements was $5.9 million. The Company has minimum collateral posting thresholds with certain of its derivative counterparties and has posted collateral at September 30, 2020 as noted above. Other Derivative Related Activity The Company also participates in loans originated by third party banks, where the originating bank utilizes a back-to-back interest-rate swap structure; however, the Company is not a party to the swap agreements. Under the terms of the loan participations, the Company has accepted contingent liabilities that would only be realized if the swaps were terminated early and there were outstanding losses not covered by the underlying borrowers and the borrowers' pledged collateral. If applicable, the Company's swap-loss exposure would be equal to a percentage of the originating bank's swap loss based on the ratio of the Company's loan participation to the underlying loan. At both September 30, 2020 and December 31, 2019, the Company had one participation loan where the originating bank utilizes a back-to-back interest-rate swap structure. At September 30, 2020, management considers the risk of material swap-loss exposure related to this participation loan to be unlikely based on the borrower's financial and collateral strength. Management continues to closely monitor for credit changes resulting from the pandemic.

Stockholder's Equity

Stockholder's Equity	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity Shares Authorized and Share Issuance The Company's authorized capital is divided into common stock and preferred stock. The Company is authorized to issue 40,000,000 shares of common stock, with a par value of $0.01 per share, and as of September 30, 2020 had 11,926,198 shares issued and outstanding. Holders of common stock are entitled to one vote per share and are entitled to receive dividends if, as, and when declared by the Company's Board of Directors (the "Board"). Dividend and liquidation rights of the common stock may be subject to the rights of any outstanding preferred stock. The Company is also authorized to issue 1,000,000 shares of preferred stock, with a par value of $0.01 per share. No preferred stock has been issued as of the date of this Form 10-Q. The Company has a stockholders' rights plan. Under the plan, each share of common stock includes a right to purchase under certain circumstances one one-hundredth of a share of the Company's Series A Junior Participating Preferred Stock, par value $0.01 per share, at a purchase price of $122.50 per one one-hundredth of a preferred share, subject to adjustment, or, in certain circumstances, to receive cash, property, shares of common stock or other securities of the Company. The rights are not presently exercisable and remain attached to the shares of common stock until the occurrence of certain triggering events that would ordinarily be associated with an unsolicited acquisition or attempted acquisition of 10% or more of the Company's outstanding shares of common stock. The rights have no voting or dividend privileges, and unless and until they become exercisable, have no dilutive effect on the earnings of the Company. The rights will expire, unless earlier redeemed, exchanged, or otherwise rescinded by the Company, on January 13, 2028. The Company's stock incentive plans permit the Board to grant, under various terms, stock options (for the purchase of newly issued shares of common stock), common stock, restricted stock awards, restricted stock units and stock appreciation rights to officers and other employees, non-employee directors and consultants. The Company issues stock options and restricted stock awards to officers and other employees and restricted stock awards and stock compensation in lieu of cash fees to non-employee directors. The restricted stock awards allow for the non-forfeitable receipt of dividends, and the voting of all shares, whether or not vested, throughout the vesting periods at the same proportional level as common shares outstanding. The unvested restricted stock awards are the Company's only participating securities and are included in shares outstanding. Unvested participating restricted awards amounted to 118,440 shares and 102,056 shares as of September 30, 2020 and December 31, 2019, respectively. See Note 13, "Earnings per Share," of this Form 10-Q, contained below, for further information regarding unvested participating restricted awards and the Company's earnings per share calculation. Upon vesting, restricted stock awards may be net settled to cover payment for employee tax obligations, resulting in shares of common stock being reacquired by the Company and returned to the pool of shares reserved for issuance under the incentive plans. In accordance with Massachusetts law, shares reacquired by the Company will be treated as authorized but unissued shares. The Company's stock incentive plans also allow for newly issued shares of common stock to be issued without restrictions to officers and other employees, non-employee directors and consultants. From time to time, the Company issues shares to community members for consulting on regional advisory councils and grants shares of fully vested stock as employee anniversary awards. These shares vest immediately and the cost, which is based on the market price on the date of grant and deemed to be immaterial, is expensed in the period in which the services are rendered. See Note 12, "Stock-Based Compensation," to the Company's unaudited consolidated interim financial statements of this Form 10-Q, contained below, for additional information regarding the Company's stock incentive plans. In addition, the Company maintains a dividend reinvestment and direct stock purchase plan ("DRSPP") which enables stockholders, at their discretion, to elect to reinvest cash dividends paid on their shares of the Company's common stock by purchasing additional shares of common stock from the Company at a purchase price equal to fair market value. Under the DRSPP, stockholders and new investors also have the opportunity to purchase shares of the Company's common stock without brokerage fees, subject to monthly minimums and maximums.

Comprehensive Income (Loss)

Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Comprehensive Income (Loss)	Comprehensive Income (Loss)Comprehensive income is defined as all changes to stockholders' equity except investments by and distributions to stockholders. Net income is one component of comprehensive income, with other components referred to in the aggregate as other comprehensive income. See below for the Company's other components of comprehensive income at the respective dates. Pursuant to GAAP, the Company initially excludes these unrealized holding gains and losses from net income; however, they are later reported as reclassifications out of accumulated other comprehensive income into net income when the losses or gains are realized. The following table presents a reconciliation of the changes in the components of other comprehensive income (loss) for the dates indicated, including the amount of income tax (expense) benefit allocated to each component of other comprehensive income (loss): Three months ended September 30, 2020 Three months ended September 30, 2019 (Dollars in thousands) Pre Tax Tax (Expense) Benefit After Tax Amount Pre Tax Tax (Expense) Benefit After Tax Amount Change in fair value of debt securities $ 57 $ (9) $ 48 $ 2,891 $ (642) $ 2,249 Less: net security gains reclassified into non-interest income 127 (29) 98 — — — Net change in fair value of debt securities (70) 20 (50) 2,891 (642) 2,249 Change in fair value of cash flow hedges 14 (4) 10 — — — Less: net cash flow hedges losses reclassified into interest expense (218) 61 (157) — — — Net change in fair value of cash flow hedges 232 (65) 167 — — — Total other comprehensive income (loss), net $ 162 $ (45) $ 117 $ 2,891 $ (642) $ 2,249 Nine months ended September 30, 2020 Nine months ended September 30, 2019 (Dollars in thousands) Pre Tax Tax (Expense) Benefit After Tax Amount Pre Tax Tax (Expense) Benefit After Tax Amount Change in fair value of debt securities $ 17,887 $ (3,971) $ 13,916 $ 17,385 $ (3,876) $ 13,509 Less: net security gains reclassified into non-interest income 227 (51) 176 146 (32) 114 Net change in fair value of debt securities 17,660 (3,920) 13,740 17,239 (3,844) 13,395 Change in fair value of cash flow hedges (3,334) 937 (2,397) — — — Less: net cash flow hedges losses reclassified into interest expense (278) 78 (200) — — — Net change in fair value of cash flow hedges (3,056) 859 (2,197) — — — Total other comprehensive income (loss), net $ 14,604 $ (3,061) $ 11,543 $ 17,239 $ (3,844) $ 13,395 Information on the Company's accumulated other comprehensive income (loss), net of tax, is comprised of the following components as of the periods indicated: Three months ended September 30, 2020 Three months ended September 30, 2019 (Dollars in thousands) Unrealized gains on debt securities Unrealized losses on cash flow hedges Total Unrealized gains on debt securities Unrealized losses on cash flow hedges Total Accumulated other comprehensive income - beginning balance $ 24,300 $ (2,364) $ 21,936 $ 9,862 $ — $ 9,862 Total other comprehensive income (loss), net (50) 167 117 2,249 — 2,249 Accumulated other comprehensive income - ending balance $ 24,250 $ (2,197) $ 22,053 $ 12,111 $ — $ 12,111 Nine months ended September 30, 2020 Nine months ended September 30, 2019 (Dollars in thousands) Unrealized gains on debt securities Unrealized losses on cash flow hedges Total Unrealized gains (losses) on debt securities Unrealized gains (losses) on cash flow hedges Total Accumulated other comprehensive income - beginning balance $ 10,510 $ — $ 10,510 $ (1,284) $ — $ (1,284) Total other comprehensive income (loss), net 13,740 (2,197) 11,543 13,395 — 13,395 Accumulated other comprehensive income - ending balance $ 24,250 $ (2,197) $ 22,053 $ 12,111 $ — $ 12,111

Supplemental Retirement Plan an

Supplemental Retirement Plan and Other Postretirement Benefit Obligations	9 Months Ended
	Sep. 30, 2020
Retirement Benefits [Abstract]
Employee Benefit Plans	Supplemental Retirement Plans and Other Post-Retirement Benefit Obligations Supplemental Employee Retirement Plan ("SERP") The Company has salary continuation agreements with two of its current executive officers and one former executive officer. These salary continuation agreements provide for predetermined fixed-cash supplemental retirement benefits to be provided for a period of 20 years after each individual reaches a defined "benefit age." The individuals covered under the SERP have reached the defined benefit age and are receiving payments under the SERP. Additionally, the Company has not recognized service costs in the current or prior year as each officer had previously attained their individually defined benefit age and was fully vested under the SERP. This non-qualified plan represents a direct liability of the Company, and as such, the Company has no specific assets set aside to settle the benefit obligation. The aggregate amount accrued, or the "accumulated benefit obligation," is equal to the present value of the benefits to be provided to the employee or any beneficiary. Because the Company's benefit obligations provide for predetermined fixed-cash payments, the Company does not have any unrecognized costs to be included as a component of accumulated other comprehensive income. Benefits paid under the SERP amounted to $69 thousand and $207 thousand for both the three and nine months ended September 30, 2020 and September 30, 2019, respectively. Total expenses for the SERP were $20 thousand and $60 thousand for the three and nine months ended September 30, 2020, respectively, compared to $25 thousand and $75 thousand for the three and nine months ended September 30, 2019, respectively. The Company anticipates accruing an additional $20 thousand related to the SERP during the remainder of 2020. Supplemental Life Insurance The Company has provided supplemental life insurance through split-dollar life insurance arrangements for certain executive and senior officers on whom the Bank owns bank-owned life insurance. These arrangements provide a death benefit to the officer's designated beneficiaries that extend to post-retirement periods for some of the supplemental life insurance plans. The Company has recognized a liability for these future post-retirement benefits. These non-qualified plans represent a direct liability of the Company and, as such, the Company has no specific assets set aside to settle the benefit obligation. The funded status is the aggregate amount accrued, or the "accumulated post-retirement benefit obligation," which is the present value of the post-retirement benefits associated with this arrangement. Total net periodic post-retirement benefit cost for supplemental life insurance plans, which consisted mainly of interest costs, were $23 thousand and $69 thousand for the three and nine months ended September 30, 2020, respectively, compared to $50 thousand and $149 thousand for the three and nine months ended September 30, 2019, respectively. See also Note 12, "Stock-Based Compensation," of this Form 10-Q, contained below, for further information regarding employee benefits offered in the form of stock options and stock awards.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Stock-Based Compensation	Stock-Based Compensation The Company currently has one active stock incentive plan: The Enterprise Bancorp, Inc. 2016 Stock Incentive Plan, as amended (the "2016 plan"). As of September 30, 2020, 191,790 shares of Company common stock remained available for future grants under the 2016 plan. Awards previously granted under an earlier, now expired, plan remain outstanding and may be exercised through 2028. The Company's stock-based compensation expense related to these plans includes stock options and stock awards to officers and other employees included in salary and benefits expense, and stock awards and stock compensation in lieu of cash fees to non-employee directors, both included in other operating expenses. Total stock-based compensation expense was $476 thousand and $1.4 million for the three and nine months ended September 30, 2020, respectively, compared to $461 thousand and $1.4 million for the three and nine months ended September 30, 2019, respectively. A tax benefit of $6 thousand and a tax expense of $29 thousand associated with employee exercises and vesting of stock compensation was recorded as an adjustment to the Company's income tax expense for the three and nine months ended September 30, 2020, respectively, compared with a tax benefit of $3 thousand and $131 thousand for the three and nine months ended September 30, 2019, respectively. These amounts, treated as discrete tax items in the period in which they occur, will vary from year to year as a function of the volume of share-based payments vested or exercised and the then-current market price of the Company's stock in comparison to the compensation cost recognized in the Company's unaudited consolidated interim financial statements. Stock Option Awards The table below provides a summary of the options granted, including the weighted average fair value, the fair value as a percentage of the market value of the stock at the date of grant and the average assumptions used in the model for the periods indicated: Nine Months Ended September 30, 2020 2019 Options granted 24,208 23,218 Term in years 10 10 Weighted average assumptions used in the fair value model: Expected volatility 37 % 33 % Expected dividend yield 3.43 % 2.75 % Expected life in years 6.5 6.5 Risk-free interest rate 1.02 % 2.58 % Weighted average market price on date of grants $ 28.22 $ 29.84 Per share weighted average fair value $ 8.41 $ 8.70 Fair value as a percentage of market value at grant date 30 % 29 % Options granted during the first nine months of 2020 and 2019 generally vest 50% in year two and 50% in year four, on or about the anniversary date of the awards. The Company utilizes the Black-Scholes option valuation model in order to determine the per share grant date fair value of stock option grants. The Company recognized stock-based compensation expense related to stock option awards of $46 thousand and $136 thousand for the three and nine months ended September 30, 2020, respectively, compared to $48 thousand and $144 thousand for the three and nine months ended September 30, 2019, respectively. Restricted Stock Awards Restricted stock awards are granted at the market price of the Company's common stock on the date of the grant. Employee restricted stock awards generally vest over four years in equal portions beginning on or about the first anniversary date of the restricted stock award or are performance-based restricted stock awards that vest upon the Company achieving certain predefined performance objectives. Non-employee director restricted stock awards generally vest over two years in equal portions beginning on or about the first anniversary date of the restricted stock award. The table below provides a summary of restricted stock awards granted during the periods indicated: Nine Months Ended September 30, Restricted Stock Awards (number of underlying shares) 2020 2019 Two-year vesting 8,295 8,368 Four-year vesting 26,015 22,403 Performance-based vesting 25,001 24,427 Total restricted stock awards granted 59,311 55,198 Weighted average grant date fair value $ 28.22 $ 29.84 Stock-based compensation expense recognized in association with stock awards, mainly restricted stock awards, amounted to $374 thousand and $1.1 million for the three and nine months ended September 30, 2020, respectively, compared to $363 thousand and $1.1 million for the three and nine months ended September 30, 2019, respectively. Stock in Lieu of Directors' Fees In addition to restricted stock awards discussed above, the non-employee members of the Company's Board may opt to receive newly issued shares of the Company's common stock in lieu of cash compensation for attendance at Board and Board committee meetings. Stock-based compensation expense related to these directors' fees amounted to $56 thousand and $214 thousand for the three and nine months ended September 30, 2020, respectively, compared to $50 thousand and $188 thousand for the three and nine months ended September 30, 2019, respectively, and is included in other operating expenses. In January 2020, non-employee directors were issued 8,346 shares of the Company's common stock in lieu of 2019 annual cash fees of $253 thousand at a price of $30.35 per share, based on the Company's average quarterly close price in 2019. For further information regarding the Company's stock awards, see Note 9, "Stockholders' Equity," of this Form 10-Q, contained above, under the caption "Shares Authorized and Share Issuance." There have been no material changes to the terms of the Company's stock incentive plans or the terms for vesting, forfeiture and settlement for options and restricted stock awards granted and outstanding under such plans as reported in the 2019 Annual Report on Form 10-K. Refer to Note 13, "Stock-Based Compensation Plans," to the Company's audited consolidated financial statements in the Company's 2019 Annual Report on Form 10-K for further information on the Company's stock incentive plans, stock options and restricted awards including descriptions of the assumptions used in the valuation model for stock options.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
Earnings Per Share	Earnings per Share Basic earnings per share are calculated by dividing net income available to common stockholders by the weighted average number of common shares outstanding (including participating securities) during the year. The Company's only participating securities are unvested restricted stock awards that contain non-forfeitable rights to dividends. See Note 9, "Stockholders' Equity," under the caption "Shares Authorized and Share Issuance," of this Form 10-Q above for further information regarding the Company's participating securities. Diluted earnings per share reflects the effect on weighted average shares outstanding of the number of additional shares outstanding if dilutive stock options were converted into common stock using the treasury stock method. The table below presents the increase in average shares outstanding, using the treasury stock method, for the diluted earnings per share calculation for the periods indicated: Three months ended September 30, Nine months ended September 30, 2020 2019 2020 2019 Basic weighted average common shares outstanding 11,916,486 11,808,603 11,886,811 11,779,629 Dilutive shares 10,557 34,894 21,905 40,759 Diluted weighted average common shares outstanding 11,927,043 11,843,497 11,908,716 11,820,388 There were 102,733 and 75,979 stock options outstanding for the three and nine months ended September 30, 2020, respectively, that were determined to be anti-dilutive and therefore excluded from the calculation of dilutive shares for those periods. There were 52,571 stock options outstanding for the three and nine months ended September 30, 2019, respectively, that were determined to be anti-dilutive and therefore excluded from the calculation of dilutive shares for those periods. These stock options, which were not dilutive at those dates, may potentially dilute earnings per share in the future.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The FASB defines the fair value of an asset or liability to be the price which a seller would receive in an orderly transaction between market participants (an exit price) and also establishes a fair value hierarchy segregating fair value measurements using three levels of inputs: (Level 1) quoted market prices in active markets for identical assets or liabilities; (Level 2) significant other observable inputs, including quoted prices for similar items in active markets, quoted prices for identical or similar items in markets that are not active, inputs such as interest rates and yield curves, volatilities, prepayment speeds, credit risks and default rates which provide a reasonable basis for fair value determination or inputs derived principally from observed market data; and (Level 3) significant unobservable inputs for situations in which there is little, if any, market activity for the asset or liability. Unobservable inputs must reflect reasonable assumptions that market participants would use in pricing the asset or liability, which are developed based on the best information available under the circumstances. The following tables summarize significant assets and liabilities carried at fair value and placement in the fair value hierarchy at the dates specified: September 30, 2020 Fair Value Measurements using: (Dollars in thousands) Fair Value (Level 1) (Level 2) (Level 3) Assets measured on a recurring basis: Debt securities $ 497,480 $ — $ 497,480 $ — Equity securities 651 651 — — FHLB stock 1,905 — 1,905 — Interest-rate swaps 2,821 — 2,821 — Assets measured on a non-recurring basis: Impaired loans (collateral dependent) 1,992 — — 1,992 Liabilities measured on a recurring basis: Interest-rate swaps $ 5,878 $ — $ 5,878 $ — December 31, 2019 Fair Value Measurements using: (Dollars in thousands) Fair Value (Level 1) (Level 2) (Level 3) Assets measured on a recurring basis: Debt securities $ 504,788 $ — $ 504,788 $ — Equity securities 467 467 — — FHLB stock 4,484 — 4,484 — Interest-rate swaps 625 — 625 — Assets measured on a non-recurring basis: Impaired loans (collateral dependent) 1,268 — — 1,268 Liabilities measured on a recurring basis: Interest-rate swaps $ 625 $ — $ 625 $ — All of the Company's debt securities are considered "available-for-sale" and are carried at fair value. The debt security category above includes federal agency obligations, commercial and residential federal agency MBS, municipal securities, corporate bonds, and CDs, as held at those dates. The Company utilizes third-party pricing vendors to provide valuations on its debt securities. Fair values provided by the vendors were generally determined based upon pricing matrices utilizing observable market data inputs for similar or benchmark securities in active markets and/or based on a matrix pricing methodology which employs The Bond Market Association's standard calculations for cash flow and price/yield analysis, live benchmark bond pricing and terms/condition data available from major pricing sources. Therefore, management regards the inputs and methods used by third-party pricing vendors to be "Level 2 inputs and methods" as defined in the "fair value hierarchy." The Company periodically obtains a second price from an impartial third party on debt securities to assess the reasonableness of prices provided by the primary independent pricing vendor. The Company's equity portfolio fair value is measured based on quoted market prices for the shares; therefore, these securities are categorized as Level 1 within the fair value hierarchy. The Bank is required to purchase FHLB stock at par value in association with advances from the FHLB. The stock is issued, redeemed, repurchased and transferred by the FHLB only at their fixed par value. This stock is classified as a restricted investment and carried at FHLB par value which management believes approximates fair value; therefore, these securities are categorized as Level 2 measures. Impaired loan balances in the table above represent those collateral dependent commercial loans where management has estimated the probable credit loss by comparing the loan's carrying value against the expected realizable fair value of the collateral (appraised value, or internal analysis, less estimated cost to sell, adjusted as necessary for changes in relevant valuation factors subsequent to the measurement date). Certain inputs used in these assessments, and possible subsequent adjustments, are not always observable, and therefore, collateral dependent loans are categorized as Level 3 within the fair value hierarchy. A specific allowance is assigned to the collateral dependent loan for the amount of management's estimated probable credit loss. The specific allowances assigned to the collateral dependent impaired loans amounted to $4.0 million at September 30, 2020 compared to $564 thousand at December 31, 2019. The fair values for the interest-rate swap assets and liabilities, which is comprised of back-to-back swaps and cash flow hedges, represent a FASB Level 2 measurement and are based on settlement values adjusted for credit risks and observable market interest rate curves. The settlement values are based on discounted cash flow analysis, a widely accepted valuation technique, reflecting the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves. Credit risk adjustments consider factors such as the likelihood of default by the Company and its counterparties, its net exposures and remaining contractual life. The change in value of interest-rate swap assets and liabilities attributable to credit risk was not significant during the reported periods. Refer also to Note 8, "Derivatives and Hedging Activities," this Form 10-Q, contained above, for additional information on the Company's interest-rate swaps. Letters of credit are conditional commitments issued by the Company to guarantee the financial obligation or performance of a customer to a third party. The fair value of these commitments was estimated to be the fees charged to enter into similar agreements, and accordingly these fair value measures are deemed to be FASB Level 2 measurements. In accordance with the FASB, the estimated fair values of these commitments are carried on the Consolidated Balance Sheet as a liability and amortized to income over the life of the letters of credit, which are typically one year. The estimated fair value of these commitments carried on the Consolidated Balance Sheets at September 30, 2020 and December 31, 2019 were deemed immaterial. Interest-rate lock commitments related to the origination of mortgage loans that will be sold are considered derivative instruments. The commitments to sell loans are also considered derivative instruments. The Company generally does not pool mortgage loans for sale, but instead sells the loans on an individual basis. To reduce the net interest-rate exposure arising from its loan sale activity, the Company enters into the commitment to sell these loans at essentially the same time that the interest-rate lock commitment is quoted on the origination of the loan. The Company estimates the fair value of these derivatives based on current secondary mortgage market prices. These commitments are accounted for in accordance with FASB guidance. The fair values of the Company's derivative instruments are deemed to be FASB Level 2 measurements. At September 30, 2020 and December 31, 2019, the estimated fair value of the Company's interest-rate lock commitments and commitments to sell these mortgage loans were deemed immaterial. The following table presents additional quantitative information about assets measured at fair value on a non-recurring basis for which the Company utilized Level 3 inputs (significant unobservable inputs for situations in which there is little, if any, market activity for the asset or liability) to determine fair value as of September 30, 2020 and December 31, 2019: Fair Value (Dollars in thousands) September 30, 2020 December 31, 2019 Valuation Technique Unobservable Input Unobservable Input Value or Range Assets measured on a non-recurring basis: Impaired loans (collateral dependent) $ 1,992 $ 1,268 Appraisal of collateral Appraisal adjustments (1) 5% - 50% __________________________________________ (1) Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. Estimated Fair Values of Assets and Liabilities In addition to disclosures regarding the measurement of assets and liabilities carried at fair value on the Consolidated Balance Sheet, the Company is also required to disclose fair value information about financial instruments for which it is practicable to estimate that value, whether or not recognized on the Consolidated Balance Sheet. The carrying values, estimated fair values and placement in the fair value hierarchy of the Company's consolidated financial instruments for which fair value is only disclosed but not recognized on the Consolidated Balance Sheets at the dates indicated are summarized as follows: September 30, 2020 Fair value measurement (Dollars in thousands) Carrying Fair Value Level 1 Inputs Level 2 Inputs Level 3 Inputs Financial assets: Loans held for sale $ 5,311 $ 5,337 $ — $ 5,337 $ — Loans, net 3,106,980 3,146,344 — — 3,146,344 Financial liabilities: CDs (including brokered) 335,473 339,330 — 339,330 — Borrowed funds 1,679 1,593 — 1,593 — Subordinated debt 73,725 77,902 — — 77,902 December 31, 2019 Fair value measurement (Dollars in thousands) Carrying Fair Value Level 1 Inputs Level 2 Inputs Level 3 Inputs Financial assets: Loans held for sale $ 601 $ 609 $ — $ 609 $ — Loans, net 2,531,845 2,542,577 — — 2,542,577 Financial liabilities: CDs 310,951 311,975 — 311,975 — Borrowed funds 96,173 96,045 — 96,045 — Subordinated debt 14,872 14,957 — — 14,957 Excluded from the tables above are certain financial instruments with carrying values that approximated their fair value at the dates indicated, as they were short-term in nature or payable on demand. These include cash and cash equivalents, accrued interest and non-term deposit accounts. The respective carrying values of these instruments would all be classified within Level 1 of their fair value hierarchy.

Supplemental Cash Flow

Supplemental Cash Flow	9 Months Ended
	Sep. 30, 2020
Supplemental Cash Flow Elements [Abstract]
Cash Flow, Supplemental Disclosures	Supplemental Cash Flow Information The supplemental cash flow information for the nine months ended September 30, 2020 and September 30, 2019 is as follows: Nine Months Ended September 30, (Dollars in thousands) 2020 2019 Supplemental financial data: Cash paid for: interest $ 11,502 $ 16,222 Cash paid for: income taxes 11,883 8,760 Cash paid for: lease liability 921 875 Supplemental schedule of non-cash activity: Net purchases of investment securities not yet settled — 6,348 Transfer from loans to other real estate owned — 255 ROU lease assets: operating leases (1) — 19,635 _________________________________________ (1) This represents the right of use ("ROU") lease asset that was recorded upon adoption of ASC 842 in 2019 and new leases added in the periods indicated.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
Principles of Consolidation	The accompanying unaudited consolidated interim financial statements and these notes should be read in conjunction with the December 31, 2019 audited consolidated financial statements and notes thereto contained in the 2019 Annual Report on Form 10-K of Enterprise Bancorp, Inc. (the "Company," "Enterprise," "we," or "our") as filed with the Securities and Exchange Commission (the "SEC") on March 10, 2020 (the "2019 Annual Report on Form 10-K"). The Company has not materially changed its significant accounting policies from those disclosed in its 2019 Annual Report on Form 10-K, other than to elect options for the temporary deferral of certain accounting guidance as allowed under the Coronavirus Aid, Relief, and Economic Security ("CARES") Act as discussed under Item (c), "Accounting Policies," below in this Note 1. See also Item (e), "Recent Accounting Pronouncements," under the subheading "Accounting pronouncements adopted by the Company," below in this Note 1. The accompanying unaudited consolidated interim financial statements of Enterprise Bancorp, Inc., a Massachusetts corporation, include the accounts of the Company and its wholly owned subsidiary, Enterprise Bank and Trust Company, commonly referred to as Enterprise Bank (the "Bank"). The Bank is a Massachusetts trust company and state chartered commercial bank organized in 1989. Substantially all of the Company's operations are conducted through the Bank and its subsidiaries. The Bank's subsidiaries include Enterprise Insurance Services, LLC and Enterprise Wealth Services, LLC, both organized under the laws of the State of Delaware, to engage in insurance sales activities and offer non-deposit investment products and services, respectively. In addition, the Bank has the following subsidiaries that are incorporated in the Commonwealth of Massachusetts and classified as security corporations in accordance with applicable Massachusetts General Laws: Enterprise Security Corporation; Enterprise Security Corporation II; and Enterprise Security Corporation III. The security corporations, which hold various types of qualifying securities, are limited to conducting investment activities that the Bank itself would be allowed to conduct under applicable laws. The Company's headquarters and the Bank's main office are located at 222 Merrimack Street in Lowell, Massachusetts. At September 30, 2020, the Company had 25 full-service branch banking offices serving the Greater Merrimack Valley, Nashoba Valley and North Central regions of Massachusetts and Southern New Hampshire (Southern Hillsborough and Rockingham counties). The Company is also scheduled to open a branch in North Andover, Massachusetts early 2021. Through the Bank and its subsidiaries, the Company offers a range of commercial, residential and consumer loan products, deposit products and cash management services, electronic and digital banking options, and commercial insurance services. The Company also provides a range of wealth management, wealth services and trust services delivered via two channels, Enterprise Wealth Management and Enterprise Wealth Services. The services offered through the Bank and its subsidiaries are managed as one strategic unit and represent the Company's only reportable operating segment. The Federal Deposit Insurance Corporation (the "FDIC") and the Massachusetts Division of Banks (the "Division") have regulatory authority over the Bank. The Bank is also subject to certain regulatory requirements of the Board of Governors of the Federal Reserve System (the "Federal Reserve Board") and, with respect to its New Hampshire branch operations, the New Hampshire Banking Department. The business and operations of the Company are subject to the regulatory oversight of the Federal Reserve Board. The Division also retains supervisory jurisdiction over the Company.
Basis of Accounting	The accompanying unaudited consolidated interim financial statements and notes thereto, on this Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2020 (this "Form 10-Q"), have been prepared in accordance with U.S. generally accepted accounting principles ("GAAP") for interim financial information and the SEC instructions for Quarterly Reports on Form 10-Q through the rules and interpretive releases of the SEC under federal securities law. In the opinion of management, the accompanying unaudited consolidated interim financial statements reflect all necessary adjustments consisting of normal recurring accruals for a fair presentation. All significant intercompany balances and transactions have been eliminated in the accompanying unaudited consolidated interim financial statements.Interim results are not necessarily indicative of results to be expected for the entire year, or any future period.
Reclassifications	Certain previous years' amounts in the unaudited consolidated financial statements, and notes thereto, have been reclassified to conform to the current year's presentation.
Uses of Estimates	Uses of EstimatesIn preparing the unaudited consolidated interim financial statements in conformity with GAAP, management is required to exercise judgment in determining many of the methodologies, assumptions and estimates to be utilized. These assumptions and estimates affect the reported values of assets and liabilities as of the balance sheet dates and income and expenses for the period then ended. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates should the assumptions and estimates used be incorrect or change over time due to changes in circumstances. Changes in those estimates resulting from continuing changes in the economic environment and other factors will be reflected in the consolidated financial statements and results of operations in future periods.As discussed in the Company's 2019 Annual Report on Form 10-K, the three most significant areas in which management applies critical assumptions and estimates are: the estimates of the allowance for loan losses, impairment review of investment securities, and the impairment review of goodwill. Refer to Note 1, "Summary of Significant Accounting Policies," to the Company's audited consolidated financial statements included in the Company's 2019 Annual Report on Form 10-K for accounting policies related to these significant estimates.
Restricted Cash and Investments	Restricted Cash and Investments When the Company has pledged cash as collateral in relation to certain derivatives, the cash is carried as restricted cash within "Interest-earning deposits" on the Company's Consolidated Balance Sheet. See Note 8, "Derivatives and Hedging Activities," to the Company's unaudited consolidated interim financial statements below in this Form 10-Q for more information about the Company's collateral related to its derivatives. As a member of the FHLB, the Company is required to purchase certain levels of FHLB capital stock at par value in association with outstanding advances from the FHLB. This FHLB stock represents the only restricted investment held by the Company and is carried at cost, which management believes approximates fair value. Based on management's periodic review for other-than-temporary impairment ("OTTI"), the Company has not recorded any OTTI charges on this investment to date.
Other Accounting Policies	Other Accounting Policies The CARES Act allows certain financial institutions the option to delay the adoption of the Financial Accounting Standards Board ("FASB") Accounting Standards Update ("ASU") No. 2016-13 (Measurement of Credit Losses on Financial Instruments), including the current expected credit loss ("CECL") methodology for estimating allowances for credit losses, during the period beginning on March 27, 2020 until the earlier of (1) the date on which the national emergency concerning the COVID-19 pandemic ("pandemic") declared under the National Emergencies Act terminates; or (2) December 31, 2020. In the first quarter of 2020, the Company elected to delay the adoption of CECL. See Item (e) "Recent Accounting Pronouncements," under the subheading "Accounting pronouncements not yet adopted by the Company," below in this Note 1 for additional information on CECL. In addition, Section 4013 of the CARES Act provides the option for financial institutions to suspend troubled debt restructuring ("TDR") accounting under GAAP in certain circumstances, during the period beginning March 1, 2020 and ending on the earlier of (1) December 31, 2020; or (2) the date that is 60 days after the date on which the national emergency concerning the pandemic declared under the National Emergencies Act terminates. The Company is suspending TDR accounting, which primarily impacts financial statement disclosure, for loans that have had a short-term payment deferral related to the pandemic since March 1, 2020, as long as those loans were current and risk rated as “pass” as of December 31, 2019.
Subsequent events	Subsequent Events The Company has evaluated subsequent events and transactions from September 30, 2020 through the date this Form 10-Q was filed with the SEC for potential recognition or disclosure as required by GAAP and determined that other than the item noted below, there were no material subsequent events requiring recognition or disclosure. In late October 2020, management determined that it was prudent to downgrade the credit rating on a large commercial real estate relationship from pass credit risk rated to substandard and to classify as TDR non-accrual. This financing is in a previously identified industry considered to be most at-risk from the impact of the pandemic and had previous short-term modifications. The relationship was not able to resume contractual payments upon expiration and subsequently requested, and was granted, an additional principal and interest deferral in late October 2020. Interest income of approximately $313 thousand, related to this $15.2 million relationship will be reversed in the fourth quarter.
Recent Accounting Pronouncements	Recent Accounting PronouncementsThe tables below summarize recent accounting pronouncements issued by the FASB that were either recently adopted by the Company or have not yet been adopted. For pronouncements not yet adopted, the effective date listed below is in line with the required adoption date for public business entities, such as the Company, though certain accounting pronouncements may permit early adoption. For more detailed information regarding these pronouncements, refer to the FASB's ASUs. Accounting pronouncements adopted by the Company Standard/Adoption Date Description Effect on Financial Statements or Other Significant Matters ASU No. 2018-13, Fair Value Measurement January 1, 2020 The amendments in this ASU modify the disclosure requirements related primarily to level 3 fair value measurements of the fair value hierarchy. The adoption of ASU No. 2018-13 in January 2020 did not have a material impact on the Company's consolidated financial statements and results of operations because this ASU relates primarily to disclosure requirements and the dollar amounts of related assets held by the Company are immaterial. ASU No.2018-15, Intangibles-Goodwill and Other- Internal-Use Software (ASU Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract January 1, 2020 The major provision in the amendments in this ASU requires an entity to capitalize certain implementation costs incurred in a hosting arrangement that is a service contract in accordance with current GAAP for internal-use software and expense these costs over the term of the hosting arrangement. Additionally, these capitalized implementation costs are required to be reviewed for impairment in accordance with current GAAP for internal-use software. The amendments in this ASU should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The adoption of ASU No. 2018-15 in January 2020 did not have a material impact on the Company's consolidated financial statements and results of operations. ASU No. 2020-04. Reference Rate Reform (Topic 848) - Facilitation of the Effects of Reference Rate Reform on Financial Reporting Upon Issuance The amendments in the provision are effective for a limited period and mainly address accounting and reporting challenges due to the transition from LIBOR on existing contracts. The optional expedients may be applied to loans, borrowings, leases and derivatives. The standard 1) simplifies the accounting analyses for contract modifications and 2) simplifies the hedge effectiveness assessment and allows hedging relationships impacted by the LIBOR transition to continue. This ASU was effective upon issuance and is applicable until December 31, 2022. The Company adopted this ASU prospectively and made certain optional elections related to its cashflow hedge relationships which did not materially impact our consolidated financial statements. The Company continues to assess the other implications and expedients under this standard, which allows for elections to be made at different time intervals, but does not expect that the ASU will have a material impact on the Company's consolidated financial statements, or results of operations. Accounting pronouncements not yet adopted by the Company Standard/Anticipated Adoption Date Description Effect on Financial Statements or Other Significant Matters ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments The earlier of (1) the date on which the national emergency concerning the pandemic declared by the National Emergencies Act terminates; or (2) December 31, 2020. The amendments in this ASU require a financial asset (or a group of financial assets) measured on an amortized cost basis to be presented at the net amount expected to be collected. Previously, when credit losses were measured under GAAP, an entity generally only considered past events and current conditions in measuring the incurred loss and generally recognition of the full amount of credit losses was delayed until the loss was probable of occurring. The amendments in this ASU eliminate the probable initial recognition threshold in current GAAP and, instead, reflect an entity's current estimate of CECL. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the report amount. An entity must use judgment in determining the relevant information and estimation methods that are appropriate in its circumstances. The Statement of Income reflects the measurement of credit losses for newly recognized financial assets, as well as the expected increases or decreases of expected credit losses that have taken place during the period. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial asset(s) to present the net carrying value at the amount expected to be collected on the financial asset. In accordance with the CARES Act, the Company elected to defer the adoption of this standard. The Company continues to monitor regulatory guidance related to this deferment. As of September 30, 2020, the Company estimates adoption of CECL would have increased the total allowance for loan losses (credit losses under CECL), including the reserves for unfunded commitments by $8.0 million to $11.0 million and increased the total allowance for credit losses to total loans ratio from 1.65% to a range of 1.95% to 2.06%, excluding Paycheck Protection Program ("PPP") loans that are SBA guaranteed and are estimated to have nominal credit risk. CECL will be adopted with an effective retrospective implementation date of January 1, 2020. Included in the estimated total increase in the allowance for credit losses is approximately pre-tax $3.0 million that will be recorded through equity, net of taxes, as the CECL day one implementation adjustment and pre-tax $5.0 million to $8.0 million that will be recorded through earnings and applied retrospectively to the applicable March 31, June 30, and September 30 quarterly results. In March 2020, the regulatory banking agencies issued an interim final rule that allows banking institutions that implement CECL during 2020 to delay for two years the estimated impact of CECL on regulatory capital, followed by a three-year transition period. The Company is currently assessing its options at this time and will make its election when it adopts CECL. The foregoing observations are subject to change as management completes its analysis and adopts the standard later this year. ASU No. 2018-14, Compensation-Retirement Benefits-Defined Benefit Plans-General (ASU Subtopic 715-20) - Disclosure Framework- Changes to the Disclosure Requirements for Defined Benefit Plans January 1, 2021 The amendments in this ASU modify the disclosure requirements on defined benefit plans including requiring disclosures about significant gains and losses related to changes in the benefit obligation. The adoption of ASU No. 2018-14 will not have a material impact on the Company's consolidated financial statements and results of operations because this ASU relates primarily to disclosure requirements and the balances of the benefit plans impacted by this ASU are immaterial to the Company.

Comprehensive Income (Loss) (Po

Comprehensive Income (Loss) (Policies)	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Comprehensive Income	Comprehensive income is defined as all changes to stockholders' equity except investments by and distributions to stockholders. Net income is one component of comprehensive income, with other components referred to in the aggregate as other comprehensive income. See below for the Company's other components of comprehensive income at the respective dates. Pursuant to GAAP, the Company initially excludes these unrealized holding gains and losses from net income; however, they are later reported as reclassifications out of accumulated other comprehensive income into net income when the losses or gains are realized.

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Schedule of Debt Securities, Available-for-Sale Investments Reconciliation	The amortized cost and fair values of debt securities at the dates specified are summarized as follows: September 30, 2020 (Dollars in thousands) Amortized Unrealized Unrealized Fair Value Residential federal agency MBS (1) $ 178,022 $ 6,717 $ 143 $ 184,596 Commercial federal agency MBS (1) 107,142 8,103 — 115,245 Taxable municipal securities 79,868 8,622 — 88,490 Tax-exempt municipal securities 90,239 7,013 — 97,252 Corporate bonds 11,051 846 — 11,897 Total debt securities, at fair value $ 466,322 $ 31,301 $ 143 $ 497,480 December 31, 2019 (Dollars in thousands) Amortized Unrealized Unrealized Fair Value Federal agency obligations (1) $ 999 $ 5 $ — $ 1,004 Residential federal agency MBS (1) 190,392 2,599 333 192,658 Commercial federal agency MBS (1) 111,182 3,453 — 114,635 Taxable municipal securities 79,095 2,726 134 81,687 Tax-exempt municipal securities 95,342 4,696 — 100,038 Corporate bonds 13,826 485 — 14,311 CDs (2) 454 1 — 455 Total debt securities, at fair value $ 491,290 $ 13,965 $ 467 $ 504,788 __________________________________________ (1) These categories may include investments issued or guaranteed by government sponsored enterprises such as Fannie Mae ("FNMA"), Freddie Mac ("FHLMC"), Federal Farm Credit Bank ("FFCB"), or one of several Federal Home Loan Banks, as well as investments guaranteed by Ginnie Mae ("GNMA"), a wholly-owned government entity.
Schedule of Unrealized Loss on Debt Securities, Available-for-Sale Investments	The following tables summarize debt securities with unrealized losses, due to the fair values having declined below the amortized costs of the individual investments, by the duration of their continuous unrealized loss positions at September 30, 2020 and December 31, 2019: September 30, 2020 Less than 12 months 12 months or longer Total (Dollars in thousands) Fair Unrealized Fair Unrealized Fair Unrealized # of holdings Residential federal agency MBS $ 15,433 $ 143 $ — $ — $ 15,433 $ 143 5 Total temporarily impaired debt securities $ 15,433 $ 143 $ — $ — $ 15,433 $ 143 5 December 31, 2019 Less than 12 months 12 months or longer Total (Dollars in thousands) Fair Unrealized Fair Unrealized Fair Unrealized # of holdings Residential federal agency MBS $ 36,464 $ 263 $ 5,060 $ 70 $ 41,524 $ 333 11 Taxable municipal securities 16,826 134 — — 16,826 134 15 Total temporarily impaired debt securities $ 53,290 $ 397 $ 5,060 $ 70 $ 58,350 $ 467 26
Debt Securities, Available-for-Sale Investments Classified by Contractual Maturity Date	The contractual maturity distribution at September 30, 2020 of debt securities was as follows: (Dollars in thousands) Amortized Cost Fair Value Due in one year or less $ 8,202 $ 8,250 Due after one, but within five years 96,187 103,196 Due after five, but within ten years 147,763 162,303 Due after ten years 214,170 223,731 Total debt securities $ 466,322 $ 497,480
Schedule of Realized Gain (Loss) on Sales of Debt Securities, Available-for-Sale Investments	Sales of debt securities for the three and nine months ended September 30, 2020 and September 30, 2019 are summarized as follows: Three months ended September 30, Nine months ended September 30, (Dollars in thousands) 2020 2019 2020 2019 Amortized cost of debt securities sold (1) $ 3,153 $ — $ 5,680 $ 11,621 Gross realized gains on sales 127 — 227 149 Gross realized losses on sales — — — (3) Total proceeds from sales of debt securities $ 3,280 $ — $ 5,907 $ 11,767 _________________________________________ (1) Amortized cost of investments sold is determined on a specific identification basis and includes pending trades based on trade date, if applicable.
Gain (Loss) on Equity Securities	Gains and losses on equity securities for the three and nine months ended September 30, 2020 and September 30, 2019 are summarized as follows: Three months ended September 30, Nine months ended September 30, (Dollars in thousands) 2020 2019 2020 2019 Net gains (losses) recognized during the period on equity securities $ (3) $ 12 $ (135) $ 275 Less: Net losses recognized on equity securities sold during the period — 36 (11) 36 Unrealized gains (losses) recognized during the reporting period on equity securities still held at the end of the period $ (3) $ (24) $ (124) $ 239

Loans (Tables)

Loans (Tables)	9 Months Ended
	Sep. 30, 2020
Receivables [Abstract]
Schedule of Loans by Loan Classification	Major classifications of loans at the dates indicated were as follows: (Dollars in thousands) September 30, December 31, Commercial real estate $ 1,490,649 $ 1,394,179 Commercial and industrial 435,856 501,227 Commercial construction 384,121 317,477 SBA Paycheck Protection Program 508,196 — Total commercial loans 2,818,822 2,212,883 Residential mortgages 254,784 247,373 Home equity 84,778 98,252 Consumer 9,070 10,054 Total retail loans 348,632 355,679 Gross loans 3,167,454 2,568,562 Deferred loan origination fees, net (3,144) (3,103) Deferred PPP fees (13,495) — Total loans 3,150,815 2,565,459 Allowance for loan losses (43,835) (33,614) Net loans $ 3,106,980 $ 2,531,845
Schedule of Loans Pledged as Collateral	Loans designated as qualified collateral and pledged to the FHLB for borrowing capacity as of the dates indicated are summarized below: (Dollars in thousands) September 30, December 31, Commercial real estate $ 208,970 $ 246,865 Residential mortgages 237,096 231,028 Home equity 6,748 7,676 Total loans pledged to FHLB $ 452,814 $ 485,569

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2020
Receivables [Abstract]
Financing Receivables by Evaluation Method	The balances of loans as of September 30, 2020 by portfolio classification and evaluation method are summarized as follows: (Dollars in thousands) Loans individually Loans collectively Gross Loans Commercial real estate $ 16,190 $ 1,474,459 $ 1,490,649 Commercial and industrial 8,964 426,892 435,856 Commercial construction 6,121 378,000 384,121 SBA PPP loans — 508,196 508,196 Residential mortgages 604 254,180 254,784 Home equity 399 84,379 84,778 Consumer 31 9,039 9,070 Total gross loans $ 32,309 $ 3,135,145 $ 3,167,454 The balances of loans as of December 31, 2019 by portfolio classification and evaluation method are summarized as follows: (Dollars in thousands) Loans individually Loans collectively Gross Loans Commercial real estate $ 17,515 $ 1,376,664 $ 1,394,179 Commercial and industrial 9,332 491,895 501,227 Commercial construction 3,347 314,130 317,477 Residential mortgages 1,229 246,144 247,373 Home equity 411 97,841 98,252 Consumer 44 10,010 10,054 Total gross loans $ 31,878 $ 2,536,684 $ 2,568,562
Financing Receivable Credit Quality Indicators	The following tables present the Company's credit risk profile for each portfolio classification by internally assigned adverse risk rating category as of the periods indicated: September 30, 2020 Adversely Classified Not Adversely (Dollars in thousands) Substandard Doubtful Loss Classified Gross Loans Commercial real estate $ 20,086 $ — $ — $ 1,470,563 $ 1,490,649 Commercial and industrial 9,215 2,303 — 424,338 435,856 Commercial construction 6,625 — — 377,496 384,121 SBA PPP loans — — — 508,196 508,196 Residential mortgages 481 — — 254,303 254,784 Home equity 481 — — 84,297 84,778 Consumer 54 — — 9,016 9,070 Total gross loans $ 36,942 $ 2,303 $ — $ 3,128,209 $ 3,167,454 December 31, 2019 Adversely Classified Not Adversely (Dollars in thousands) Substandard Doubtful Loss Classified Gross Loans Commercial real estate $ 16,664 $ — $ — $ 1,377,515 $ 1,394,179 Commercial and industrial 10,900 2,370 — 487,957 501,227 Commercial construction 4,836 — — 312,641 317,477 Residential mortgages 1,825 — — 245,548 247,373 Home equity 455 — — 97,797 98,252 Consumer 69 3 — 9,982 10,054 Total gross loans $ 34,749 $ 2,373 $ — $ 2,531,440 $ 2,568,562
Past Due Financing Receivables	The following tables present an age analysis of past due loans by portfolio classification as of the dates indicated: Balance at September 30, 2020 (Dollars in thousands) 30-59 Days 60-89 Days Past Due 90 days or more Total Past Current Loans Gross Non-accrual Loans Commercial real estate $ 1,439 $ 375 $ 5,954 $ 7,768 $ 1,482,881 $ 1,490,649 $ 9,719 Commercial and industrial 285 227 753 1,265 434,591 435,856 4,981 Commercial construction 14,929 — 4,116 19,045 365,076 384,121 6,121 SBA PPP loans — — — — 508,196 508,196 — Residential mortgages 325 297 — 622 254,162 254,784 409 Home equity 49 — 269 318 84,460 84,778 399 Consumer 3 — — 3 9,067 9,070 12 Total gross loans $ 17,030 $ 899 $ 11,092 $ 29,021 $ 3,138,433 $ 3,167,454 $ 21,641 Balance at December 31, 2019 (Dollars in thousands) 30-59 Days 60-89 Days Past Due 90 days or more Total Past Current Loans Gross Loans Non-accrual Loans Commercial real estate $ 1,469 $ 3,914 $ 4,158 $ 9,541 $ 1,384,638 $ 1,394,179 $ 8,280 Commercial and industrial 576 1,034 265 1,875 499,352 501,227 3,285 Commercial construction 576 3,325 1,735 5,636 311,841 317,477 1,735 Residential mortgages 700 283 623 1,606 245,767 247,373 411 Home equity 645 — 169 814 97,438 98,252 1,040 Consumer 12 — 6 18 10,036 10,054 20 Total gross loans $ 3,978 $ 8,556 $ 6,956 $ 19,490 $ 2,549,072 $ 2,568,562 $ 14,771
Impaired Financing Receivables	The following tables set forth the recorded investment in impaired loans and the related specific allowance allocated by portfolio classification as of the dates indicated: Balance at September 30, 2020 (Dollars in thousands) Unpaid Total recorded Recorded Recorded Related specific Commercial real estate $ 17,348 $ 16,190 $ 15,908 $ 282 $ 18 Commercial and industrial 11,055 8,964 5,054 3,910 2,890 Commercial construction 6,249 6,121 3,510 2,611 1,651 SBA PPP loans — — — — — Residential mortgages 704 604 604 — — Home equity 560 399 399 — — Consumer 32 31 — 31 31 Total $ 35,948 $ 32,309 $ 25,475 $ 6,834 $ 4,590 Balance at December 31, 2019 (Dollars in thousands) Unpaid Total recorded Recorded Recorded Related specific Commercial real estate $ 18,537 $ 17,515 $ 17,129 $ 386 $ 31 Commercial and industrial 11,455 9,332 7,405 1,927 974 Commercial construction 3,359 3,347 3,347 — — Residential mortgages 1,331 1,229 1,229 — — Home equity 607 411 411 — — Consumer 44 44 — 44 44 Total $ 35,333 $ 31,878 $ 29,521 $ 2,357 $ 1,049 The following table presents the average recorded investment in impaired loans by portfolio classification and the related interest recognized during the three months indicated: Three months ended September 30, 2020 Three months ended September 30, 2019 (Dollars in thousands) Average recorded Interest income Average recorded Interest income Commercial real estate $ 16,002 $ 66 $ 17,828 $ 140 Commercial and industrial 9,208 50 10,886 85 Commercial construction 7,180 17 1,732 26 SBA PPP loans — — — — Residential mortgages 700 2 1,034 (2) Home equity 434 — 427 — Consumer 36 — 29 1 Total $ 33,560 $ 135 $ 31,936 $ 250 The following table presents the average recorded investment in impaired loans by portfolio classification and the related interest recognized during the nine months indicated: Nine months ended September 30, 2020 Nine months ended September 30, 2019 (Dollars in thousands) Average recorded Interest income Average recorded Interest income recognized Commercial real estate $ 15,188 $ 208 $ 16,685 $ 382 Commercial and industrial 8,560 118 11,426 294 Commercial construction 6,537 22 1,735 78 SBA PPP loans — — — — Residential mortgages 939 6 954 16 Home equity 418 (1) 457 — Consumer 39 1 24 — Total $ 31,681 $ 354 $ 31,281 $ 770
Troubled Debt Restructurings on Financing Receivables	The following table sets forth the post modification balances of TDRs listed by type of modification for TDRs that occurred during the nine month periods indicated: Nine months ended September 30, 2020 September 30, 2019 (Dollars in thousands) Number of Amount Number of Amount Extended maturity date 2 $ 1,145 — $ — Temporary payment reduction and payment re-amortization of remaining principal over extended term 6 1,599 8 49 Temporary interest only payment plan — — 3 386 Forbearance of post default rights 4 2,070 — — Other payment concessions — — 4 1,773 Total 12 $ 4,814 15 $ 2,208 Amount of specific reserves included in the allowance for loan losses associated with TDRs listed above $ 1,240 $ 72 The following table presents number and balance of loans modified as TDRs, by portfolio classification, during the three months indicated: Three months ended September 30, 2020 September 30, 2019 (Dollars in thousands) Number of Pre-modification Post-modification Number of Pre-modification Post-modification Commercial real estate 1 $ 217 $ 215 — $ — $ — Commercial and industrial 3 410 413 2 22 22 Commercial construction — — — — — — SBA PPP loans — — — — — — Residential mortgages — — — — — — Home equity loans and lines — — — — — — Consumer — — — 1 7 7 Total 4 $ 627 $ 628 3 $ 29 $ 29 Three months ended September 30, 2020 September 30, 2019 (Dollars in thousands) Number of TDRs that defaulted Post- Number of TDRs that defaulted Post- Commercial real estate — $ — 1 $ 1,400 Commercial and industrial 2 327 2 62 Commercial construction 2 1,510 — — SBA PPP loans — — — — Residential mortgages — — 1 311 Home equity loans and lines — — — — Consumer — — 1 5 Total 4 $ 1,837 5 $ 1,778 The following table presents number and balance of loans modified as TDRs, by portfolio classification, during the nine months indicated: Nine months ended September 30, 2020 September 30, 2019 (Dollars in thousands) Number of Pre-modification Post-modification Number of Pre-modification Post-modification Commercial real estate 1 $ 217 $ 215 3 $ 2,047 $ 1,623 Commercial and industrial 4 884 672 9 428 261 Commercial construction 6 4,754 3,927 — — — SBA PPP loans — — — — — — Residential mortgages — — — 1 315 311 Home equity — — — — — — Consumer 1 1 — 2 13 13 Total 12 $ 5,856 $ 4,814 15 $ 2,803 $ 2,208 Nine months ended September 30, 2020 September 30, 2019 (Dollars in thousands) Number of TDRs that defaulted Post- Number of TDRs that defaulted Post- Commercial real estate — $ — 1 $ 1,400 Commercial and industrial 4 391 4 233 Commercial construction 4 2,655 — — SBA PPP loans — — — — Residential mortgages — — 1 311 Home equity — — — — Consumer 1 — 1 5 Total 9 $ 3,046 7 $ 1,949
Allowance for Credit Losses on Financing Receivables	Changes in the allowance for loan losses by portfolio classification for the three months ended September 30, 2020 are presented below: (Dollars in thousands) Cmml Real Cmml and Cmml Resid. Home Consumer Total Beginning Balance at June 30, 2020 $ 22,477 $ 9,763 $ 7,498 $ 1,728 $ 613 $ 245 $ 42,324 Provision 1,159 489 73 (59) (67) (20) 1,575 Recoveries — 33 — — 4 9 46 Less: Charge offs — 103 — — — 7 110 Ending Balance at September 30, 2020 $ 23,636 $ 10,182 $ 7,571 $ 1,669 $ 550 $ 227 $ 43,835 Changes in the allowance for loan losses by portfolio classification for the nine months ended September 30, 2020 are presented below: (Dollars in thousands) Cmml Real Cmml and Cmml Resid. Home Consumer Total Beginning Balance at December 31, 2019 $ 18,338 $ 9,129 $ 4,149 $ 1,195 $ 536 $ 267 $ 33,614 Provision 5,298 1,248 3,422 474 4 (49) 10,397 Recoveries — 207 — — 10 34 251 Less: Charge offs — 402 — — — 25 427 Ending Balance at September 30, 2020 $ 23,636 $ 10,182 $ 7,571 $ 1,669 $ 550 $ 227 $ 43,835 Ending allowance balance: Allocated to loans individually evaluated for impairment $ 18 $ 2,890 $ 1,651 $ — $ — $ 31 $ 4,590 Allocated to loans collectively evaluated for impairment $ 23,618 $ 7,292 $ 5,920 $ 1,669 $ 550 $ 196 $ 39,245 Changes in the allowance for loan losses by portfolio classification for the three months ended September 30, 2019 are presented below: (Dollars in thousands) Cmml Real Cmml and Cmml Resid. Home Consumer Total Beginning Balance at June 30, 2019 $ 17,828 $ 10,731 $ 3,717 $ 1,187 $ 629 $ 259 $ 34,351 Provision 174 357 491 (6) (3) 12 1,025 Recoveries — 114 — — 2 12 128 Less: Charge offs — 1,533 — — — 36 1,569 Ending Balance at September 30, 2019 $ 18,002 $ 9,669 $ 4,208 $ 1,181 $ 628 $ 247 $ 33,935 Changes in the allowance for loan losses by portfolio classification for the nine months ended September 30, 2019 are presented below: (Dollars in thousands) Cmml Real Cmml and Cmml Resid. Home Consumer Total Beginning Balance at December 31, 2018 $ 18,014 $ 10,493 $ 3,307 $ 1,160 $ 629 $ 246 $ 33,849 Provision (12) 598 901 21 (8) 80 1,580 Recoveries — 570 — — 7 25 602 Less: Charge offs — 1,992 — — — 104 2,096 Ending Balance at September 30, 2019 $ 18,002 $ 9,669 $ 4,208 $ 1,181 $ 628 $ 247 $ 33,935 Ending allowance balance: Allocated to loans individually evaluated for impairment $ 4 $ 1,088 $ — $ 2 $ — $ 25 $ 1,119 Allocated to loans collectively evaluated for impairment $ 17,998 $ 8,581 $ 4,208 $ 1,179 $ 628 $ 222 $ 32,816

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2020
Leases [Abstract]
Operating lease liability maturity table as lessee	At September 30, 2020, the remaining undiscounted cash flows by year of these lease liabilities were as follows: (Dollars in thousands) Operating Leases 2020 (three remaining months) $ 330 2021 1,242 2022 1,244 2023 1,251 2024 1,256 Thereafter 23,344 Total lease payments 28,667 Less: Imputed interest 10,977 Total lease liability $ 17,690

Deposits (Tables)

Deposits (Tables)	9 Months Ended
	Sep. 30, 2020
Deposits [Abstract]
Schedule of Deposit Liabilities	Deposits are summarized as follows: (Dollars in thousands) September 30, 2020 December 31, 2019 Non-interest checking $ 1,274,210 $ 794,583 Interest-bearing checking 539,610 467,988 Savings 255,417 203,236 Money market 1,205,350 1,009,972 CDs $250,000 or less 185,867 220,751 CDs greater than $250,000 74,611 90,200 Total customer deposits 3,535,065 2,786,730 Brokered deposits (1) 74,995 — Total deposits $ 3,610,060 $ 2,786,730 ___________________________________ (1) Brokered CDs which are $250,000 and under.

Borrowed Funds (Tables)

Borrowed Funds (Tables)	9 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Schedule of Borrowed Funds Maturity	Borrowed funds at September 30, 2020 and December 31, 2019 are summarized, as follows: September 30, 2020 December 31, 2019 (Dollars in thousands) Balance Rate Balance Rate Overnight $ — — % $ 92,000 1.85 % Within 12 months 1,216 0.42 % 3,697 2.22 % Over 5 years 463 — % 476 — %

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivatives, Fair Value and Classification	The tables below present a summary of the Company's derivative financial instruments, notional amounts and fair values for the periods presented: As of September 30, 2020 (Dollars in thousands) Asset Notional Amount Asset Derivatives (1) Liability Notional Amount Liability Derivatives (1) Derivatives designated as hedging instruments Interest-rate contracts - pay fixed, receive floating $ — $ — $ 75,000 $ 3,057 Total cash flow hedge interest-rate swaps $ — $ — $ 75,000 $ 3,057 Derivatives not subject to hedge accounting Interest-rate contracts - pay floating, receive fixed $ 38,458 $ 2,821 $ — $ — Interest-rate contracts - pay fixed, receive floating — — 38,458 2,821 Total back-to-back interest-rate swaps $ 38,458 $ 2,821 $ 38,458 $ 2,821 December 31, 2019 (Dollars in thousands) Asset Notional Amount Asset Derivatives (1) Liability Notional Amount Liability Derivatives (1) Derivatives not subject to hedge accounting Interest-rate contracts - pay floating, receive fixed $ 10,502 $ 625 $ 12,273 $ 187 Interest-rate contracts - pay fixed, receive floating — — 22,775 438 Total back-to-back interest-rate swaps $ 10,502 $ 625 $ 35,048 $ 625 __________________________________________
Schedule of Derivatives - Offsetting Assets and Liabilities	The table below presents at December 31, 2019, the Company's liability derivative positions and the potential effect of those netting arrangements on its financial position. As noted above, interest-rate swaps with customers are not subject to master netting agreements and therefore are not included in the table below. As of December 31, 2019 (Dollars in thousands) Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Liabilities Derivatives Interest-rate contracts - pay fixed, receive floating $ 625 $ 187 $ 438

Comprehensive Income (Loss) (Ta

Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Comprehensive Income (Loss) Reconciliation of Changes	The following table presents a reconciliation of the changes in the components of other comprehensive income (loss) for the dates indicated, including the amount of income tax (expense) benefit allocated to each component of other comprehensive income (loss): Three months ended September 30, 2020 Three months ended September 30, 2019 (Dollars in thousands) Pre Tax Tax (Expense) Benefit After Tax Amount Pre Tax Tax (Expense) Benefit After Tax Amount Change in fair value of debt securities $ 57 $ (9) $ 48 $ 2,891 $ (642) $ 2,249 Less: net security gains reclassified into non-interest income 127 (29) 98 — — — Net change in fair value of debt securities (70) 20 (50) 2,891 (642) 2,249 Change in fair value of cash flow hedges 14 (4) 10 — — — Less: net cash flow hedges losses reclassified into interest expense (218) 61 (157) — — — Net change in fair value of cash flow hedges 232 (65) 167 — — — Total other comprehensive income (loss), net $ 162 $ (45) $ 117 $ 2,891 $ (642) $ 2,249 Nine months ended September 30, 2020 Nine months ended September 30, 2019 (Dollars in thousands) Pre Tax Tax (Expense) Benefit After Tax Amount Pre Tax Tax (Expense) Benefit After Tax Amount Change in fair value of debt securities $ 17,887 $ (3,971) $ 13,916 $ 17,385 $ (3,876) $ 13,509 Less: net security gains reclassified into non-interest income 227 (51) 176 146 (32) 114 Net change in fair value of debt securities 17,660 (3,920) 13,740 17,239 (3,844) 13,395 Change in fair value of cash flow hedges (3,334) 937 (2,397) — — — Less: net cash flow hedges losses reclassified into interest expense (278) 78 (200) — — — Net change in fair value of cash flow hedges (3,056) 859 (2,197) — — — Total other comprehensive income (loss), net $ 14,604 $ (3,061) $ 11,543 $ 17,239 $ (3,844) $ 13,395
Schedule of Accumulated Other Comprehensive Income (Loss)	Information on the Company's accumulated other comprehensive income (loss), net of tax, is comprised of the following components as of the periods indicated: Three months ended September 30, 2020 Three months ended September 30, 2019 (Dollars in thousands) Unrealized gains on debt securities Unrealized losses on cash flow hedges Total Unrealized gains on debt securities Unrealized losses on cash flow hedges Total Accumulated other comprehensive income - beginning balance $ 24,300 $ (2,364) $ 21,936 $ 9,862 $ — $ 9,862 Total other comprehensive income (loss), net (50) 167 117 2,249 — 2,249 Accumulated other comprehensive income - ending balance $ 24,250 $ (2,197) $ 22,053 $ 12,111 $ — $ 12,111 Nine months ended September 30, 2020 Nine months ended September 30, 2019 (Dollars in thousands) Unrealized gains on debt securities Unrealized losses on cash flow hedges Total Unrealized gains (losses) on debt securities Unrealized gains (losses) on cash flow hedges Total Accumulated other comprehensive income - beginning balance $ 10,510 $ — $ 10,510 $ (1,284) $ — $ (1,284) Total other comprehensive income (loss), net 13,740 (2,197) 11,543 13,395 — 13,395 Accumulated other comprehensive income - ending balance $ 24,250 $ (2,197) $ 22,053 $ 12,111 $ — $ 12,111

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	The table below provides a summary of the options granted, including the weighted average fair value, the fair value as a percentage of the market value of the stock at the date of grant and the average assumptions used in the model for the periods indicated: Nine Months Ended September 30, 2020 2019 Options granted 24,208 23,218 Term in years 10 10 Weighted average assumptions used in the fair value model: Expected volatility 37 % 33 % Expected dividend yield 3.43 % 2.75 % Expected life in years 6.5 6.5 Risk-free interest rate 1.02 % 2.58 % Weighted average market price on date of grants $ 28.22 $ 29.84 Per share weighted average fair value $ 8.41 $ 8.70 Fair value as a percentage of market value at grant date 30 % 29 %
Schedule of Restricted Stock Awards Granted	The table below provides a summary of restricted stock awards granted during the periods indicated: Nine Months Ended September 30, Restricted Stock Awards (number of underlying shares) 2020 2019 Two-year vesting 8,295 8,368 Four-year vesting 26,015 22,403 Performance-based vesting 25,001 24,427 Total restricted stock awards granted 59,311 55,198 Weighted average grant date fair value $ 28.22 $ 29.84

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
Schedule of Weighted Average Number of Shares	The table below presents the increase in average shares outstanding, using the treasury stock method, for the diluted earnings per share calculation for the periods indicated: Three months ended September 30, Nine months ended September 30, 2020 2019 2020 2019 Basic weighted average common shares outstanding 11,916,486 11,808,603 11,886,811 11,779,629 Dilutive shares 10,557 34,894 21,905 40,759 Diluted weighted average common shares outstanding 11,927,043 11,843,497 11,908,716 11,820,388

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis	The following tables summarize significant assets and liabilities carried at fair value and placement in the fair value hierarchy at the dates specified: September 30, 2020 Fair Value Measurements using: (Dollars in thousands) Fair Value (Level 1) (Level 2) (Level 3) Assets measured on a recurring basis: Debt securities $ 497,480 $ — $ 497,480 $ — Equity securities 651 651 — — FHLB stock 1,905 — 1,905 — Interest-rate swaps 2,821 — 2,821 — Assets measured on a non-recurring basis: Impaired loans (collateral dependent) 1,992 — — 1,992 Liabilities measured on a recurring basis: Interest-rate swaps $ 5,878 $ — $ 5,878 $ — December 31, 2019 Fair Value Measurements using: (Dollars in thousands) Fair Value (Level 1) (Level 2) (Level 3) Assets measured on a recurring basis: Debt securities $ 504,788 $ — $ 504,788 $ — Equity securities 467 467 — — FHLB stock 4,484 — 4,484 — Interest-rate swaps 625 — 625 — Assets measured on a non-recurring basis: Impaired loans (collateral dependent) 1,268 — — 1,268 Liabilities measured on a recurring basis: Interest-rate swaps $ 625 $ — $ 625 $ —
Quantitative Information About Significant Unobservable Inputs for Fair Value Measurements	The following table presents additional quantitative information about assets measured at fair value on a non-recurring basis for which the Company utilized Level 3 inputs (significant unobservable inputs for situations in which there is little, if any, market activity for the asset or liability) to determine fair value as of September 30, 2020 and December 31, 2019: Fair Value (Dollars in thousands) September 30, 2020 December 31, 2019 Valuation Technique Unobservable Input Unobservable Input Value or Range Assets measured on a non-recurring basis: Impaired loans (collateral dependent) $ 1,992 $ 1,268 Appraisal of collateral Appraisal adjustments (1) 5% - 50% __________________________________________ (1) Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses.
Fair Value, by Balance Sheet Grouping	The carrying values, estimated fair values and placement in the fair value hierarchy of the Company's consolidated financial instruments for which fair value is only disclosed but not recognized on the Consolidated Balance Sheets at the dates indicated are summarized as follows: September 30, 2020 Fair value measurement (Dollars in thousands) Carrying Fair Value Level 1 Inputs Level 2 Inputs Level 3 Inputs Financial assets: Loans held for sale $ 5,311 $ 5,337 $ — $ 5,337 $ — Loans, net 3,106,980 3,146,344 — — 3,146,344 Financial liabilities: CDs (including brokered) 335,473 339,330 — 339,330 — Borrowed funds 1,679 1,593 — 1,593 — Subordinated debt 73,725 77,902 — — 77,902 December 31, 2019 Fair value measurement (Dollars in thousands) Carrying Fair Value Level 1 Inputs Level 2 Inputs Level 3 Inputs Financial assets: Loans held for sale $ 601 $ 609 $ — $ 609 $ — Loans, net 2,531,845 2,542,577 — — 2,542,577 Financial liabilities: CDs 310,951 311,975 — 311,975 — Borrowed funds 96,173 96,045 — 96,045 — Subordinated debt 14,872 14,957 — — 14,957

Supplemental Cash Flow (Tables)

Supplemental Cash Flow (Tables)	9 Months Ended
	Sep. 30, 2020
Supplemental Cash Flow Elements [Abstract]
Schedule of Cash Flow, Supplemental Disclosures	The supplemental cash flow information for the nine months ended September 30, 2020 and September 30, 2019 is as follows: Nine Months Ended September 30, (Dollars in thousands) 2020 2019 Supplemental financial data: Cash paid for: interest $ 11,502 $ 16,222 Cash paid for: income taxes 11,883 8,760 Cash paid for: lease liability 921 875 Supplemental schedule of non-cash activity: Net purchases of investment securities not yet settled — 6,348 Transfer from loans to other real estate owned — 255 ROU lease assets: operating leases (1) — 19,635 _________________________________________ (1) This represents the right of use ("ROU") lease asset that was recorded upon adoption of ASC 842 in 2019 and new leases added in the periods indicated.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 31, 2020USD ($)	Sep. 30, 2020USD ($)branches	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)branchessegment	Sep. 30, 2019USD ($)	Jun. 30, 2020USD ($)	Dec. 31, 2019USD ($)	Jun. 30, 2019USD ($)	Dec. 31, 2018USD ($)
Summary of Significant Accounting Policies [Line Items]
Number of branches | branches		25		25
Reportable operating segments | segment				1
Interest income recognized		$ 135	$ 250	$ 354	$ 770
Total troubled debt restructure (TDR) loans		18,000		18,000			$ 21,100
Allowance for loan losses		$ 43,835	33,935	$ 43,835	33,935	$ 42,324	33,614	$ 34,351	$ 33,849
Allowance for Loan and Lease Losses, excluding PPP loans, Ratio		1.65%		1.65%
Retained earnings		$ 207,206		$ 207,206			191,843
Commercial real estate
Summary of Significant Accounting Policies [Line Items]
Interest income recognized		66	140	208	382
Allowance for loan losses		23,636	$ 18,002	23,636	$ 18,002	$ 22,477	$ 18,338	$ 17,828	$ 18,014
Subsequent Event | Commercial real estate
Summary of Significant Accounting Policies [Line Items]
Interest income recognized	$ 313
Total troubled debt restructure (TDR) loans	$ 15,200
Accounting Standards Update 2016-13 | Pro Forma | Cumulative Effect, Period of Adoption, Adjustment
Summary of Significant Accounting Policies [Line Items]
Retained earnings		3,000		3,000
Minimum | Accounting Standards Update 2016-13 | Pro Forma
Summary of Significant Accounting Policies [Line Items]
Allowance for loan losses		$ 8,000		$ 8,000
Allowance for Loan and Lease Losses, excluding PPP loans, Ratio		1.95%		1.95%
Minimum | Accounting Standards Update 2016-13 | Pro Forma | Cumulative Effect, Period of Adoption, Adjustment
Summary of Significant Accounting Policies [Line Items]
Retained earnings		$ 5,000		$ 5,000
Maximum | Accounting Standards Update 2016-13 | Pro Forma
Summary of Significant Accounting Policies [Line Items]
Allowance for loan losses		$ 11,000		$ 11,000
Allowance for Loan and Lease Losses, excluding PPP loans, Ratio		2.06%		2.06%
Maximum | Accounting Standards Update 2016-13 | Pro Forma | Cumulative Effect, Period of Adoption, Adjustment
Summary of Significant Accounting Policies [Line Items]
Retained earnings		$ 8,000		$ 8,000

Investment Securities Debt Secu

Investment Securities Debt Securities (Details) - USD ($) $ in Thousands		Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 466,322	$ 491,290
Debt Securities, Gross Unrealized Gains		31,301	13,965
Debt Securities, Gross Unrealized Loss		143	467
Debt securities at fair value		497,480	504,788
Federal agency obligations
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	[1]		999
Debt Securities, Gross Unrealized Gains	[1]		5
Debt Securities, Gross Unrealized Loss	[1]		0
Debt securities at fair value	[1]		1,004
Residential federal agency MBS
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	[1]	178,022	190,392
Debt Securities, Gross Unrealized Gains	[1]	6,717	2,599
Debt Securities, Gross Unrealized Loss	[1]	143	333
Debt securities at fair value	[1]	184,596	192,658
Commercial federal agency MBS
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	[1]	107,142	111,182
Debt Securities, Gross Unrealized Gains	[1]	8,103	3,453
Debt Securities, Gross Unrealized Loss	[1]	0	0
Debt securities at fair value	[1]	115,245	114,635
Taxable municipal securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		79,868	79,095
Debt Securities, Gross Unrealized Gains		8,622	2,726
Debt Securities, Gross Unrealized Loss		0	134
Debt securities at fair value		88,490	81,687
Tax-exempt municipal securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		90,239	95,342
Debt Securities, Gross Unrealized Gains		7,013	4,696
Debt Securities, Gross Unrealized Loss		0	0
Debt securities at fair value		97,252	100,038
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		11,051	13,826
Debt Securities, Gross Unrealized Gains		846	485
Debt Securities, Gross Unrealized Loss		0	0
Debt securities at fair value		11,897	14,311
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	[2]		454
Debt Securities, Gross Unrealized Gains	[2]		1
Debt Securities, Gross Unrealized Loss	[2]		0
Debt securities at fair value	[2]		455
Mortgage backed securities, excluding CMOs
Debt Securities, Available-for-sale [Line Items]
Debt securities at fair value		20,600	$ 23,500
Collateral Pledged
Debt Securities, Available-for-sale [Line Items]
Debt securities, pledged as collateral		$ 497,500
[1]	These categories may include investments issued or guaranteed by government sponsored enterprises such as Fannie Mae ("FNMA"), Freddie Mac ("FHLMC"), Federal Farm Credit Bank ("FFCB"), or one of several Federal Home Loan Banks, as well as investments guaranteed by Ginnie Mae ("GNMA"), a wholly-owned government entity.
[2]	CDs represent term deposits issued by banks that are subject to FDIC insurance and purchased on the open market.

Investment Securities Debt Se_2

Investment Securities Debt Securities- Continuous Loss Position (Details) $ in Thousands	Sep. 30, 2020USD ($)investments	Dec. 31, 2019USD ($)investments
Debt Securities, Available-for-sale [Line Items]
Debt Securities, temporarily impaired, Less than 12 Months, fair value	$ 15,433	$ 53,290
Debt Securities, temporarily impaired, less than 12 months, unrealized loss	143	397
Debt securities, temporarily impaired, 12 months or longer, fair value	0	5,060
Debt securities, temporarily impaired, 12 months or longer, unrealized loss	0	70
Debt securities, temporarily impaired, fair value	15,433	58,350
Debt securities, temporarily impaired, unrealized loss	$ 143	$ 467
Number of debt securities in loss positions | investments	5	26
Residential federal agency MBS
Debt Securities, Available-for-sale [Line Items]
Debt Securities, temporarily impaired, Less than 12 Months, fair value	$ 15,433	$ 36,464
Debt Securities, temporarily impaired, less than 12 months, unrealized loss	143	263
Debt securities, temporarily impaired, 12 months or longer, fair value	0	5,060
Debt securities, temporarily impaired, 12 months or longer, unrealized loss	0	70
Debt securities, temporarily impaired, fair value	15,433	41,524
Debt securities, temporarily impaired, unrealized loss	$ 143	$ 333
Number of debt securities in loss positions | investments	5	11
Taxable municipal securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, temporarily impaired, Less than 12 Months, fair value		$ 16,826
Debt Securities, temporarily impaired, less than 12 months, unrealized loss		134
Debt securities, temporarily impaired, 12 months or longer, fair value		0
Debt securities, temporarily impaired, 12 months or longer, unrealized loss		0
Debt securities, temporarily impaired, fair value		16,826
Debt securities, temporarily impaired, unrealized loss		$ 134
Number of debt securities in loss positions | investments		15

Investment Securities Debt Se_3

Investment Securities Debt Securities -Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Within One Year	$ 8,202
Fair Value, Within One Year	8,250
Amortized Cost Basis, After One, But Within Five Years	96,187
Fair Value, After One, But Within Five Years	103,196
Amortized Cost, After Five, But Within Ten Years	147,763
Fair Value, After Five but Within Ten Years	162,303
Amortized Cost Basis, After Ten Years	214,170
Fair Value, After Ten Years	223,731
Debt Securities, Available-for-sale, Amortized Cost	466,322	$ 491,290
Debt securities at fair value	497,480	$ 504,788
Callable debt securities, fair value	$ 87,100

Investment Securities Debt Se_4

Investment Securities Debt Securities -Sales (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Amortized cost of debt securities sold	[1]	$ 3,153	$ 0	$ 5,680	$ 11,621
Gross realized gains on sales		127	0	227	149
Gross realized losses on sales		0	0	0	(3)
Total proceeds from sales of debt securities		$ 3,280	$ 0	$ 5,907	$ 11,767
[1]	Amortized cost of investments sold is determined on a specific identification basis and includes pending trades based on trade date, if applicable.

Investment Securities Equity Se

Investment Securities Equity Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Equity Securities [Abstract]
Equity securities at fair value	$ 651		$ 651		$ 467
Net gains (losses) recognized during the period on equity securities	(3)	$ 12	(135)	$ 275
Less: Net losses recognized on equity securities sold during the period	0	36	(11)	36
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the end of the period	$ (3)	$ (24)	$ (124)	$ 239

Loans - Balance by Class of Loa

Loans - Balance by Class of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Gross loans
Gross loans	$ 3,167,454		$ 2,568,562
Total loans	3,150,815		2,565,459
Allowance for loan losses	(43,835)	$ (42,324)	(33,614)	$ (33,935)	$ (34,351)	$ (33,849)
Net loans	3,106,980		2,531,845
Commercial
Gross loans
Gross loans	2,818,822		2,212,883
Commercial real estate
Gross loans
Gross loans	1,490,649		1,394,179
Allowance for loan losses	(23,636)	(22,477)	(18,338)	(18,002)	(17,828)	(18,014)
Commercial and industrial
Gross loans
Gross loans	435,856		501,227
Allowance for loan losses	(10,182)	(9,763)	(9,129)	(9,669)	(10,731)	(10,493)
Commercial construction
Gross loans
Gross loans	384,121		317,477
Allowance for loan losses	(7,571)	(7,498)	(4,149)	(4,208)	(3,717)	(3,307)
SBA PPP loans
Gross loans
Gross loans	508,196		0
Deferred loan origination fees, net	(13,495)		0
Retail
Gross loans
Gross loans	348,632		355,679
Residential mortgages
Gross loans
Gross loans	254,784		247,373
Allowance for loan losses	(1,669)	(1,728)	(1,195)	(1,181)	(1,187)	(1,160)
Home equity
Gross loans
Gross loans	84,778		98,252
Allowance for loan losses	(550)	(613)	(536)	(628)	(629)	(629)
Consumer
Gross loans
Gross loans	9,070		10,054
Allowance for loan losses	(227)	$ (245)	(267)	$ (247)	$ (259)	$ (246)
All loans excluding PPP loans
Gross loans
Deferred loan origination fees, net	$ (3,144)		$ (3,103)

Loans - Loan Categories Narrati

Loans - Loan Categories Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Gross loans
Number of Paycheck Protection loans	2,758
Gross loans	$ 3,167,454	$ 2,568,562
Commercial
Gross loans
Participation loans amount	103,600	104,300
Gross loans	2,818,822	2,212,883
Participations loans sold that are still serviced amount	$ 75,700	80,200
SBA PPP loans
Gross loans
Loans receivable, interest rate	1.00%
Loans and leases receivable term, minimum	2 years
Loans and leases receivable term, maximum	5 years
Gross loans	$ 508,196	0
Loans and leases receivable, deferred income, gross	17,200
Amortization of deferred loan origination fees, net	3,700
Residential mortgages
Gross loans
Gross loans	254,784	247,373
Amount of loans serviced for others	$ 14,800	$ 15,700

Loans - Loans Serving as Collat

Loans - Loans Serving as Collateral (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans pledged to the FHLB for borrowing capacity	$ 452,814	$ 485,569
Commercial real estate
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans pledged to the FHLB for borrowing capacity	208,970	246,865
Residential mortgages
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans pledged to the FHLB for borrowing capacity	237,096	231,028
Home equity
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans pledged to the FHLB for borrowing capacity	$ 6,748	$ 7,676

Allowance For Loan Losses - Eva

Allowance For Loan Losses - Evaluation Method (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Financing Receivable by Evaluation Method [Line Items]
Loans individually evaluated for impairment	$ 32,309	$ 31,878
Loans collectively evaluated for impairment	3,135,145	2,536,684
Gross loans	3,167,454	2,568,562
Commercial real estate
Schedule of Financing Receivable by Evaluation Method [Line Items]
Loans individually evaluated for impairment	16,190	17,515
Loans collectively evaluated for impairment	1,474,459	1,376,664
Gross loans	1,490,649	1,394,179
Commercial and industrial
Schedule of Financing Receivable by Evaluation Method [Line Items]
Loans individually evaluated for impairment	8,964	9,332
Loans collectively evaluated for impairment	426,892	491,895
Gross loans	435,856	501,227
Commercial construction
Schedule of Financing Receivable by Evaluation Method [Line Items]
Loans individually evaluated for impairment	6,121	3,347
Loans collectively evaluated for impairment	378,000	314,130
Gross loans	384,121	317,477
SBA PPP loans
Schedule of Financing Receivable by Evaluation Method [Line Items]
Loans individually evaluated for impairment	0
Loans collectively evaluated for impairment	508,196
Gross loans	508,196	0
Residential mortgages
Schedule of Financing Receivable by Evaluation Method [Line Items]
Loans individually evaluated for impairment	604	1,229
Loans collectively evaluated for impairment	254,180	246,144
Gross loans	254,784	247,373
Home equity
Schedule of Financing Receivable by Evaluation Method [Line Items]
Loans individually evaluated for impairment	399	411
Loans collectively evaluated for impairment	84,379	97,841
Gross loans	84,778	98,252
Consumer
Schedule of Financing Receivable by Evaluation Method [Line Items]
Loans individually evaluated for impairment	31	44
Loans collectively evaluated for impairment	9,039	10,010
Gross loans	$ 9,070	$ 10,054

Allowance For Loan Losses - Adv

Allowance For Loan Losses - Adversely Classified Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	$ 3,167,454	$ 2,568,562
Adversely classified loans to total loans	1.25%	1.45%
Commercial real estate
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	$ 1,490,649	$ 1,394,179
Commercial and industrial
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	435,856	501,227
Commercial construction
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	384,121	317,477
SBA PPP loans
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	508,196	0
Residential mortgages
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	254,784	247,373
Home equity
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	84,778	98,252
Consumer
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	9,070	10,054
Substandard
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	36,942	34,749
Substandard | Commercial real estate
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	20,086	16,664
Substandard | Commercial and industrial
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	9,215	10,900
Substandard | Commercial construction
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	6,625	4,836
Substandard | SBA PPP loans
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	0
Substandard | Residential mortgages
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	481	1,825
Substandard | Home equity
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	481	455
Substandard | Consumer
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	54	69
Doubtful
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	2,303	2,373
Doubtful | Commercial real estate
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	0	0
Doubtful | Commercial and industrial
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	2,303	2,370
Doubtful | Commercial construction
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	0	0
Doubtful | SBA PPP loans
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	0
Doubtful | Residential mortgages
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	0	0
Doubtful | Home equity
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	0	0
Doubtful | Consumer
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	0	3
Loss
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	0	0
Loss | Commercial real estate
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	0	0
Loss | Commercial and industrial
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	0	0
Loss | Commercial construction
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	0	0
Loss | SBA PPP loans
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	0
Loss | Residential mortgages
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	0	0
Loss | Home equity
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	0	0
Loss | Consumer
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	0	0
Not Adversely Classified
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	3,128,209	2,531,440
Not Adversely Classified | Commercial real estate
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	1,470,563	1,377,515
Not Adversely Classified | Commercial and industrial
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	424,338	487,957
Not Adversely Classified | Commercial construction
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	377,496	312,641
Not Adversely Classified | SBA PPP loans
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	508,196
Not Adversely Classified | Residential mortgages
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	254,303	245,548
Not Adversely Classified | Home equity
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	84,297	97,797
Not Adversely Classified | Consumer
Financing Receivable, Credit Quality Indicators [Line Items]
Gross loans	$ 9,016	$ 9,982

Allowance For Loan Losses - Pas

Allowance For Loan Losses - Past Due and Non-Accrual Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	$ 3,167,454	$ 2,568,562
Total past due loans	29,021	19,490
Current loans	3,138,433	2,549,072
Non-accrual loans	$ 21,641	$ 14,771
The ratio of non-accrual loans to total loans	0.69%	0.58%
Impaired Financing Receivable, Additional Funding Commitments	$ 1,200
Number of loans with short-term payment deferrals	178
Amount of short-term payment deferrals	$ 104,100
Active Deferred Balance, Ratio	3.00%
Commercial real estate
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	$ 1,490,649	$ 1,394,179
Total past due loans	7,768	9,541
Current loans	1,482,881	1,384,638
Non-accrual loans	9,719	8,280
Commercial and industrial
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	435,856	501,227
Total past due loans	1,265	1,875
Current loans	434,591	499,352
Non-accrual loans	4,981	3,285
Commercial construction
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	384,121	317,477
Total past due loans	19,045	5,636
Current loans	365,076	311,841
Non-accrual loans	6,121	1,735
SBA PPP loans
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	508,196	0
Total past due loans	0
Current loans	508,196
Non-accrual loans	0
Residential mortgages
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	254,784	247,373
Total past due loans	622	1,606
Current loans	254,162	245,767
Non-accrual loans	409	411
Home equity
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	84,778	98,252
Total past due loans	318	814
Current loans	84,460	97,438
Non-accrual loans	399	1,040
Consumer
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	9,070	10,054
Total past due loans	3	18
Current loans	9,067	10,036
Non-accrual loans	12	20
Not Adversely Classified
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	3,128,209	2,531,440
Non-accrual loans not adversely classified	184	84
Not Adversely Classified | Commercial real estate
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	1,470,563	1,377,515
Not Adversely Classified | Commercial and industrial
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	424,338	487,957
Not Adversely Classified | Commercial construction
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	377,496	312,641
Not Adversely Classified | SBA PPP loans
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	508,196
Not Adversely Classified | Residential mortgages
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	254,303	245,548
Not Adversely Classified | Home equity
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	84,297	97,797
Not Adversely Classified | Consumer
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	9,016	9,982
Loans 30-59 Days Past Due
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	17,030	3,978
Loans 30-59 Days Past Due | Commercial real estate
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	1,439	1,469
Loans 30-59 Days Past Due | Commercial and industrial
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	285	576
Loans 30-59 Days Past Due | Commercial construction
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	14,929	576
Loans 30-59 Days Past Due | SBA PPP loans
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	0
Loans 30-59 Days Past Due | Residential mortgages
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	325	700
Loans 30-59 Days Past Due | Home equity
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	49	645
Loans 30-59 Days Past Due | Consumer
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	3	12
Loans 60-89 Days Past Due
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	899	8,556
Loans 60-89 Days Past Due | Commercial real estate
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	375	3,914
Loans 60-89 Days Past Due | Commercial and industrial
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	227	1,034
Loans 60-89 Days Past Due | Commercial construction
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	0	3,325
Loans 60-89 Days Past Due | SBA PPP loans
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	0
Loans 60-89 Days Past Due | Residential mortgages
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	297	283
Loans 60-89 Days Past Due | Home equity
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	0	0
Loans 60-89 Days Past Due | Consumer
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	0	0
Loans equal to or greater than 90 days past due
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	11,092	6,956
Loans equal to or greater than 90 days past due | Commercial real estate
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	5,954	4,158
Loans equal to or greater than 90 days past due | Commercial and industrial
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	753	265
Loans equal to or greater than 90 days past due | Commercial construction
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	4,116	1,735
Loans equal to or greater than 90 days past due | SBA PPP loans
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	0
Loans equal to or greater than 90 days past due | Residential mortgages
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	0	623
Loans equal to or greater than 90 days past due | Home equity
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	269	169
Loans equal to or greater than 90 days past due | Consumer
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	$ 0	$ 6

Allowance For Loan Losses - Imp

Allowance For Loan Losses - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
Total recorded investment in impaired loans	$ 32,309		$ 32,309		$ 31,878
Total accruing impaired loans	10,700		10,700		17,100
Impaired non-accrual loans	21,600		21,600		14,800
Unpaid contractual principal balance	35,948		35,948		35,333
Recorded investment with no allowance	25,475		25,475		29,521
Recorded investment with allowance	6,834		6,834		2,357
Related allowance	4,590		4,590		1,049
Average recorded investment	33,560	$ 31,936	31,681	$ 31,281
Interest income recognized	135	250	354	770
Impaired Financing Receivable, Additional Funding Commitments	1,200		1,200
Commercial real estate
Financing Receivable, Impaired [Line Items]
Total recorded investment in impaired loans	16,190		16,190		17,515
Unpaid contractual principal balance	17,348		17,348		18,537
Recorded investment with no allowance	15,908		15,908		17,129
Recorded investment with allowance	282		282		386
Related allowance	18		18		31
Average recorded investment	16,002	17,828	15,188	16,685
Interest income recognized	66	140	208	382
Commercial and industrial
Financing Receivable, Impaired [Line Items]
Total recorded investment in impaired loans	8,964		8,964		9,332
Unpaid contractual principal balance	11,055		11,055		11,455
Recorded investment with no allowance	5,054		5,054		7,405
Recorded investment with allowance	3,910		3,910		1,927
Related allowance	2,890		2,890		974
Average recorded investment	9,208	10,886	8,560	11,426
Interest income recognized	50	85	118	294
Commercial construction
Financing Receivable, Impaired [Line Items]
Total recorded investment in impaired loans	6,121		6,121		3,347
Unpaid contractual principal balance	6,249		6,249		3,359
Recorded investment with no allowance	3,510		3,510		3,347
Recorded investment with allowance	2,611		2,611		0
Related allowance	1,651		1,651		0
Average recorded investment	7,180	1,732	6,537	1,735
Interest income recognized	17	26	22	78
SBA PPP loans
Financing Receivable, Impaired [Line Items]
Total recorded investment in impaired loans	0		0
Unpaid contractual principal balance	0		0
Recorded investment with no allowance	0		0
Recorded investment with allowance	0		0
Related allowance	0		0
Average recorded investment	0	0	0	0
Interest income recognized	0	0	0	0
Residential mortgages
Financing Receivable, Impaired [Line Items]
Total recorded investment in impaired loans	604		604		1,229
Unpaid contractual principal balance	704		704		1,331
Recorded investment with no allowance	604		604		1,229
Recorded investment with allowance	0		0		0
Related allowance	0		0		0
Average recorded investment	700	1,034	939	954
Interest income recognized	2	(2)	6	16
Home equity
Financing Receivable, Impaired [Line Items]
Total recorded investment in impaired loans	399		399		411
Unpaid contractual principal balance	560		560		607
Recorded investment with no allowance	399		399		411
Recorded investment with allowance	0		0		0
Related allowance	0		0		0
Average recorded investment	434	427	418	457
Interest income recognized	0	0	(1)	0
Consumer
Financing Receivable, Impaired [Line Items]
Total recorded investment in impaired loans	31		31		44
Unpaid contractual principal balance	32		32		44
Recorded investment with no allowance	0		0		0
Recorded investment with allowance	31		31		44
Related allowance	31		31		$ 44
Average recorded investment	36	29	39	24
Interest income recognized	$ 0	$ 1	$ 1	$ 0

Allowance For Loan Losses - Tro

Allowance For Loan Losses - Troubled Debt Restructures (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020USD ($)restructuring	Sep. 30, 2019USD ($)restructuring	Sep. 30, 2020USD ($)restructuring	Sep. 30, 2019USD ($)restructuring	Dec. 31, 2019USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructure (TDR) loans	$ 18,000,000		$ 18,000,000		$ 21,100,000
TDR loans on accrual status	10,700,000		10,700,000		17,100,000
TDR loans included in non-performing loans	$ 7,300,000		$ 7,300,000		$ 4,000,000
Number of restructurings | restructuring	4	3	12	15
Post-modification recorded investment	$ 628,000	$ 29,000	$ 4,814,000	$ 2,208,000
Specific reserves allocated to TDRs	1,240,000	72,000	1,240,000	72,000
Pre-modification outstanding recorded investment	$ 627,000	$ 29,000	5,856,000	$ 2,803,000
Charge-offs associated with new TDRs			$ 0
Number of TDRs that defaulted | restructuring	4	5	9	7
Post-modification outstanding recorded investment, TDRs that defaulted	$ 1,837,000	$ 1,778,000	$ 3,046,000	$ 1,949,000
Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of restructurings | restructuring	1	0	1	3
Post-modification recorded investment	$ 215,000	$ 0	$ 215,000	$ 1,623,000
Pre-modification outstanding recorded investment	$ 217,000	$ 0	$ 217,000	$ 2,047,000
Number of TDRs that defaulted | restructuring	0	1	0	1
Post-modification outstanding recorded investment, TDRs that defaulted	$ 0	$ 1,400,000	$ 0	$ 1,400,000
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of restructurings | restructuring	3	2	4	9
Post-modification recorded investment	$ 413,000	$ 22,000	$ 672,000	$ 261,000
Pre-modification outstanding recorded investment	$ 410,000	$ 22,000	$ 884,000	$ 428,000
Number of TDRs that defaulted | restructuring	2	2	4	4
Post-modification outstanding recorded investment, TDRs that defaulted	$ 327,000	$ 62,000	$ 391,000	$ 233,000
Commercial construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of restructurings | restructuring	0	0	6	0
Post-modification recorded investment	$ 0	$ 0	$ 3,927,000	$ 0
Pre-modification outstanding recorded investment	$ 0	$ 0	$ 4,754,000	$ 0
Number of TDRs that defaulted | restructuring	2	0	4	0
Post-modification outstanding recorded investment, TDRs that defaulted	$ 1,510,000	$ 0	$ 2,655,000	$ 0
SBA PPP loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of restructurings | restructuring	0	0	0	0
Post-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Pre-modification outstanding recorded investment	$ 0	$ 0	$ 0	$ 0
Number of TDRs that defaulted | restructuring	0	0	0	0
Post-modification outstanding recorded investment, TDRs that defaulted	$ 0	$ 0	$ 0	$ 0
Residential mortgages
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of restructurings | restructuring	0	0	0	1
Post-modification recorded investment	$ 0	$ 0	$ 0	$ 311,000
Pre-modification outstanding recorded investment	$ 0	$ 0	$ 0	$ 315,000
Number of TDRs that defaulted | restructuring	0	1	0	1
Post-modification outstanding recorded investment, TDRs that defaulted	$ 0	$ 311,000	$ 0	$ 311,000
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of restructurings | restructuring	0	0	0	0
Post-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Pre-modification outstanding recorded investment	$ 0	$ 0	$ 0	$ 0
Number of TDRs that defaulted | restructuring	0	0	0	0
Post-modification outstanding recorded investment, TDRs that defaulted	$ 0	$ 0	$ 0	$ 0
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of restructurings | restructuring	0	1	1	2
Post-modification recorded investment	$ 0	$ 7,000	$ 0	$ 13,000
Pre-modification outstanding recorded investment	$ 0	$ 7,000	$ 1,000	$ 13,000
Number of TDRs that defaulted | restructuring	0	1	1	1
Post-modification outstanding recorded investment, TDRs that defaulted	$ 0	$ 5,000	$ 0	$ 5,000
Extended maturity date
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of restructurings | restructuring			2	0
Post-modification recorded investment			$ 1,145,000	$ 0
Temporary payment reduction and payment re-amortization of remaining principal over extended term
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of restructurings | restructuring			6	8
Post-modification recorded investment			$ 1,599,000	$ 49,000
Temporary interest only payment plan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of restructurings | restructuring			0	3
Post-modification recorded investment			$ 0	$ 386,000
Forbearance of post default rights
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of restructurings | restructuring			4	0
Post-modification recorded investment			$ 2,070,000	$ 0
Other payment concessions
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of restructurings | restructuring			0	4
Post-modification recorded investment			$ 0	$ 1,773,000

Allowance For Loan Losses - All

Allowance For Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses to total loans ratio	1.39%	1.37%	1.39%	1.37%	1.31%
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 42,324	$ 34,351	$ 33,614	$ 33,849
Provision for loan losses	1,575	1,025	10,397	1,580
Recoveries	46	128	251	602
Less: Charge offs	110	1,569	427	2,096
Ending Balance	43,835	33,935	43,835	33,935
Allocated to loans individually evaluated for impairment	4,590	1,119	4,590	1,119
Allocated to loans collectively evaluated for impairment	39,245	32,816	39,245	32,816
Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	22,477	17,828	18,338	18,014
Provision for loan losses	1,159	174	5,298	(12)
Recoveries	0	0	0	0
Less: Charge offs	0	0	0	0
Ending Balance	23,636	18,002	23,636	18,002
Allocated to loans individually evaluated for impairment	18	4	18	4
Allocated to loans collectively evaluated for impairment	23,618	17,998	23,618	17,998
Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	9,763	10,731	9,129	10,493
Provision for loan losses	489	357	1,248	598
Recoveries	33	114	207	570
Less: Charge offs	103	1,533	402	1,992
Ending Balance	10,182	9,669	10,182	9,669
Allocated to loans individually evaluated for impairment	2,890	1,088	2,890	1,088
Allocated to loans collectively evaluated for impairment	7,292	8,581	7,292	8,581
Commercial construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	7,498	3,717	4,149	3,307
Provision for loan losses	73	491	3,422	901
Recoveries	0	0	0	0
Less: Charge offs	0	0	0	0
Ending Balance	7,571	4,208	7,571	4,208
Allocated to loans individually evaluated for impairment	1,651	0	1,651	0
Allocated to loans collectively evaluated for impairment	5,920	4,208	5,920	4,208
Residential mortgages
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	1,728	1,187	1,195	1,160
Provision for loan losses	(59)	(6)	474	21
Recoveries	0	0	0	0
Less: Charge offs	0	0	0	0
Ending Balance	1,669	1,181	1,669	1,181
Allocated to loans individually evaluated for impairment	0	2	0	2
Allocated to loans collectively evaluated for impairment	1,669	1,179	1,669	1,179
Home equity
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	613	629	536	629
Provision for loan losses	(67)	(3)	4	(8)
Recoveries	4	2	10	7
Less: Charge offs	0	0	0	0
Ending Balance	550	628	550	628
Allocated to loans individually evaluated for impairment	0	0	0	0
Allocated to loans collectively evaluated for impairment	550	628	550	628
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	245	259	267	246
Provision for loan losses	(20)	12	(49)	80
Recoveries	9	12	34	25
Less: Charge offs	7	36	25	104
Ending Balance	227	247	227	247
Allocated to loans individually evaluated for impairment	31	25	31	25
Allocated to loans collectively evaluated for impairment	$ 196	$ 222	$ 196	222
General reserve factors related primarily to economic weakness
Allowance for Loan and Lease Losses [Roll Forward]
Provision for loan losses				6,300
classified and impaired loans
Allowance for Loan and Lease Losses [Roll Forward]
Provision for loan losses				3,100
loan growth and other factors
Allowance for Loan and Lease Losses [Roll Forward]
Provision for loan losses				$ 1,000

Allowance For Loan Losses - Oth

Allowance For Loan Losses - Other Real Estate Owned (Details)	9 Months Ended
	Sep. 30, 2020USD ($)property	Sep. 30, 2019USD ($)property	Dec. 31, 2019USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value of OREO	$ 0	$ 0	$ 0
OREO Additions | property	0	1
OREO Sold | property	0	1
Consumer mortgage loans in process of foreclosure, amount	$ 0		$ 0
Other real estate owned
Accounts, Notes, Loans and Financing Receivable [Line Items]
OREO fair value adjustment	$ 0	$ 0

Leases Narrative (Details)

Leases Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020USD ($)property	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)property	Sep. 30, 2019USD ($)
Leases [Abstract]
Number of operating leases | property	15		15
Operating lease expense | $	$ 326	$ 322	$ 974	$ 1,000
Weighted average remaining lease term on operating leases	26 years 9 months 18 days	27 years 6 months	26 years 9 months 18 days	27 years 6 months
Weighted average discount rate for operating leases	3.80%		3.80%

Leases Maturities (Details)

Leases Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2020 (three remaining months)	$ 330
2021	1,242
2022	1,244
2023	1,251
2024	1,256
Thereafter	23,344
Total lease payments	28,667
Less: Imputed interest	10,977
Total lease liability	$ 17,690	$ 18,104

Deposits (Details)

Deposits (Details) - USD ($) $ in Thousands		Sep. 30, 2020	Dec. 31, 2019
Deposits [Abstract]
Non-interest checking		$ 1,274,210	$ 794,583
Interest-bearing checking		539,610	467,988
Savings		255,417	203,236
Money market		1,205,350	1,009,972
CDs $250,000 or less		185,867	220,751
CDs greater than $250,000		74,611	90,200
Total customer deposits		3,535,065	2,786,730
Brokered deposits	[1]	74,995	0
Total deposits		3,610,060	2,786,730
Reciprocal deposits		$ 471,500	$ 419,700
[1]	(1)    Brokered CDs which are $250,000 and under.

Borrowed Funds and Subordinat_2

Borrowed Funds and Subordinated Debt (Details) - USD ($) $ in Thousands	Jul. 07, 2020	Jan. 31, 2015	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Borrowed funds			$ 1,679	$ 96,173
Subordinated debt			$ 73,725	$ 14,872
Fixed-to Floating Rate Subordinated Notes
Debt Instrument [Line Items]
Subordinated debt	$ 60,000	$ 15,000
Subordinated debt, term			15 years
Original debt issuance costs	$ 1,200	$ 190
Subordinated debt, rate	5.25%		6.00%

Borrowed Funds and Subordinat_3

Borrowed Funds and Subordinated Debt Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate [Abstract]
FHLB, overnight borrowings	$ 0	$ 92,000
FHLB, overnight borrowings, weighted average rate	0.00%	1.85%
FHLB, borrowings less than one year	$ 1,216	$ 3,697
FHLB, borrowings less than one year, weighted average rate	0.42%	2.22%
FHLB, borrowings greater than five years	$ 463	$ 476
FHLB, borrowings greater than five years, weighted average rate	0.00%	0.00%

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities (Details)		9 Months Ended		12 Months Ended
		Sep. 30, 2020USD ($)instrumentcounterpartiesloan	Sep. 30, 2019USD ($)	Dec. 31, 2019USD ($)instrumentloan
Derivative [Line Items]
Interest expense on cash flow hedges expected to be reclassified in 12 months		$ 947,000
Number of counterparties | counterparties		1
Fair value of swaps in a net liability position		$ 5,900,000
Number of participation loans with swap contingent liabilities | loan		1		1
Interest-rate swaps
Derivative [Line Items]
Derivative asset, notional amount		$ 38,458,000		$ 10,502,000
Fair value of interest-rate swap assets	[1]	2,821,000		625,000
Derivative liability, notional amount		38,458,000		35,048,000
Fair value of interest-rate swap liabilities	[1]	$ 2,821,000		$ 625,000
Number of interest rate swaps | instrument		10		10
Gain (loss) on interest rate swaps		$ 0	$ 0
Counterparty credit risk exposure on interest rate swaps		0		$ 0
Collateral posted for interest-rate swaps		6,100,000		850,000
Interest-rate swaps | Cash Flow Hedging
Derivative [Line Items]
Derivative asset, notional amount		0
Fair value of interest-rate swap assets	[1]	0
Derivative liability, notional amount		75,000,000
Fair value of interest-rate swap liabilities	[1]	$ 3,057,000
Number of interest rate swaps | instrument		3
Derivative, individual notional amount		$ 25,000,000
Interest-rate swaps | Cash Flow Hedging | Contract one
Derivative [Line Items]
Derivative, term of contract		3 years
Interest-rate swaps | Cash Flow Hedging | Contract two
Derivative [Line Items]
Derivative, term of contract		4 years
Interest-rate swaps | Cash Flow Hedging | Contract three
Derivative [Line Items]
Derivative, term of contract		5 years
Pay Fixed Receive Variable | Interest-rate swaps
Derivative [Line Items]
Derivative asset, notional amount		$ 0		0
Fair value of interest-rate swap assets	[1]	0		0
Derivative liability, notional amount		38,458,000		22,775,000
Fair value of interest-rate swap liabilities	[1]	2,821,000		438,000
Gross amount interest rate swap liabilities Recognized				625,000
Gross amount interest-rate offset in the statement of financial position				187,000
Pay Fixed Receive Variable | Interest-rate swaps | Cash Flow Hedging
Derivative [Line Items]
Derivative asset, notional amount		0
Fair value of interest-rate swap assets	[1]	0
Derivative liability, notional amount		75,000,000
Fair value of interest-rate swap liabilities	[1]	3,057,000
Receive Fixed Pay Variable | Interest-rate swaps
Derivative [Line Items]
Derivative asset, notional amount		38,458,000		10,502,000
Fair value of interest-rate swap assets	[1]	2,821,000		625,000
Derivative liability, notional amount		0		12,273,000
Fair value of interest-rate swap liabilities	[1]	$ 0		$ 187,000
[1]	Accrued interest balances related to the Company’s interest rate swaps are not included in the fair values above and are immaterial.

Stockholder's Equity (Details)

Stockholder's Equity (Details)	Sep. 30, 2020vote$ / sharesshares	Dec. 31, 2019$ / sharesshares
Class of Stock [Line Items]
Common stock, shares authorized	40,000,000	40,000,000
Common stock, par value | $ / shares	$ 0.01	$ 0.01
Common stock, shares issued	11,926,198	11,825,331
Common stock, votes per share, number | vote	1
Common stock, shares, outstanding	11,926,198	11,825,331
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, par value | $ / shares	$ 0.01	$ 0.01
Preferred stock, shares issued	0	0
Unvested participating restricted stock awards	118,440	102,056
Series A Junior Participating Preferred Stock
Class of Stock [Line Items]
Amount of a share allowed to be purchased under right to purchase	0.01
Price per one one-hundredth of a share | $ / shares	$ 122.50
Minimum acquisition percentage to trigger the exercise of the right to purchase	10.00%

Comprehensive Income (Loss) OCI

Comprehensive Income (Loss) OCI Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Equity [Abstract]
Change in fair value of debt securities, pre tax	$ 57	$ 2,891	$ 17,887	$ 17,385
Change in fair value of debt securities, tax (expense) benefit	(9)	(642)	(3,971)	(3,876)
Change in fair value of debt securities, after tax	48	2,249	13,916	13,509
Net security gains (losses) reclassifed into non-interest income, pre tax	127	0	227	146
Net security gains (losses) reclassified into non-interest income, tax expense (benefit)	(29)	0	(51)	(32)
Net security gains (losses) reclassified into non-interest income, after tax	98	0	176	114
Net change in fair value of debt securities, pre tax	(70)	2,891	17,660	17,239
Net change in fair value of debt securities, tax expense (benefit)	20	(642)	(3,920)	(3,844)
Net change in fair value of debt securities, after tax	(50)	2,249	13,740	13,395
Change in fair value of cash flow hedges, pre tax	14	0	(3,334)	0
Change in fair value of cash flow hedges, tax expense (benefit)	(4)	0	937	0
Change in fair value of cash flow hedges, after tax	10	0	(2,397)	0
Less: net cash flow hedges gains (losses) reclassified into interest expense, pre tax	(218)	0	(278)	0
Less: net cash flow hedges gains (losses) reclassified into interest expense, tax expense (benefit)	61	0	78	0
Less: net cash flow hedges gains (losses) reclassified into interest expense, after tax	(157)	0	(200)	0
Net change in fair value of cash flow hedges, pre tax	232	0	(3,056)	0
Net change in fair value of cash flow hedges, tax expense (benefit)	(65)	0	859	0
Net change in fair value of cash flow hedges, after tax	167	0	(2,197)	0
Other comprehensive income (loss), net, pre tax	162	2,891	14,604	17,239
Other comprehensive income (loss), net, tax expense (benefit)	(45)	(642)	(3,061)	(3,844)
Other comprehensive income, net of tax	$ 117	$ 2,249	$ 11,543	$ 13,395

Comprehensive Income (Loss) AOC

Comprehensive Income (Loss) AOCI Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ 10,510
Other comprehensive income, net of tax	$ 117	$ 2,249	11,543	$ 13,395
Ending Balance	22,053		22,053
Unrealized gains on debt securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	24,300	9,862	10,510	(1,284)
Other comprehensive income, net of tax	(50)	2,249	13,740	13,395
Ending Balance	24,250	12,111	24,250	12,111
Unrealized losses on cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(2,364)	0	0	0
Other comprehensive income, net of tax	167	0	(2,197)	0
Ending Balance	(2,197)	0	(2,197)	0
Accumulated other comprehensive income/(loss), net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	21,936	9,862	10,510	(1,284)
Other comprehensive income, net of tax	117	2,249	11,543	13,395
Ending Balance	$ 22,053	$ 12,111	$ 22,053	$ 12,111

Supplemental Retirement Plan _2

Supplemental Retirement Plan and Other Postretirement Benefit Obligations (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020USD ($)officer	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)officer	Sep. 30, 2019USD ($)
Supplemental Employee Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Number of active executive officers under plan | officer	2		2
Number of former executive officers under plan | officer	1		1
Term of SERP benefits			20 years
Benefits paid	$ 69	$ 69	$ 207	$ 207
Net periodic benefit cost	20	25	60	75
Remaining expected SERP accrual in current year	20		20
Supplemental Life Insurance Benefit
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	$ 23	$ 50	$ 69	$ 149

Stock-Based Compensation Stock

Stock-Based Compensation Stock Options, Stock Awards, and Stock in Lieu of Directors' Fees (Details) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 31, 2020shares	Sep. 30, 2020USD ($)plansshares	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)plansshares	Sep. 30, 2019USD ($)	Dec. 31, 2019USD ($)$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of individual stock incentive plans | plans		1		1
Stock-based compensation expense		$ 476	$ 461	$ 1,409	$ 1,405
Income tax (expense) benefit for stock compensation in Income Statement		6	3	(29)	131
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		46	48	$ 136	144
Restricted stock | Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				4 years
Restricted stock | Non-Employee Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				2 years
Restricted stock and common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		374	363	$ 1,100	1,100
Common stock in lieu of cash | Non-Employee Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 56	$ 50	$ 214	$ 188	$ 253
Number of shares issued in lieu of cash to directors | shares	8,346
Vesting, Year Two | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted, vesting percentage				50.00%	50.00%
Vesting, Year Four | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted, vesting percentage				50.00%	50.00%
2016 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares remain available for future grants | shares		191,790		191,790
Quarterly Average
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair market share price | $ / shares						$ 30.35

Stock-Based Compensation Summar

Stock-Based Compensation Summary Information for Options Granted (Details) - $ / shares	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted	24,208	23,218
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term in years	10 years	10 years
Expected volatility	37.00%	33.00%
Weighted average market price on date of grants	$ 28.22	$ 29.84
Per share weighted average fair value	$ 8.41	$ 8.70
Weighted Average | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	3.43%	2.75%
Expected life in years	6 years 6 months	6 years 6 months
Risk-free interest rate	1.02%	2.58%
Fair value as a percentage of market value at grant date	30.00%	29.00%

Stock-Based Compensation Restri

Stock-Based Compensation Restricted Stock Grants (Details) - Restricted stock - $ / shares	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards in the period	59,311	55,198
Weighted average grant date fair value, stock awards	$ 28.22	$ 29.84
Non-Employee Director | Two-year vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards in the period	8,295	8,368
Employee | Four-year vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards in the period	26,015	22,403
Employee | Performance-based vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards in the period	25,001	24,427

Earnings Per Share (Details)

Earnings Per Share (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding (in shares)	11,916,486	11,808,603	11,886,811	11,779,629
Dilutive shares	10,557	34,894	21,905	40,759
Diluted weighted average common shares outstanding (in shares)	11,927,043	11,843,497	11,908,716	11,820,388
Antidilutive shares excluded from EPS	102,733	52,571	75,979	52,571

Fair Value Measurements - Recur

Fair Value Measurements - Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Specific allowance for collateral dependent impaired loans	$ 4,000	$ 564
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Interest-rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of liabilities	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	651	467
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | FHLB stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Interest-rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Interest-rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of liabilities	5,878	625
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	497,480	504,788
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | FHLB stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	1,905	4,484
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Interest-rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	2,821	625
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Interest-rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of liabilities	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | FHLB stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Interest-rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	0	0
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans (collateral dependent), fair value	0	0
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans (collateral dependent), fair value	0	0
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans (collateral dependent), fair value	1,992	1,268
Fair Value | Fair Value, Measurements, Recurring | Interest-rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of liabilities	5,878	625
Fair Value | Fair Value, Measurements, Recurring | Debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	497,480	504,788
Fair Value | Fair Value, Measurements, Recurring | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	651	467
Fair Value | Fair Value, Measurements, Recurring | FHLB stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	1,905	4,484
Fair Value | Fair Value, Measurements, Recurring | Interest-rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	2,821	625
Fair Value | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans (collateral dependent), fair value	$ 1,992	$ 1,268

Fair Value Measurements - Quant

Fair Value Measurements - Quantitative (Details) - Fair Value, Measurements, Nonrecurring - Fair Value, Inputs, Level 3 - USD ($) $ in Thousands		Sep. 30, 2020	Dec. 31, 2019
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans (collateral dependent), fair value		$ 1,992	$ 1,268
Impaired loans (collateral dependent) | Appraisal of collateral
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans (collateral dependent), fair value	[1]	$ 1,992	$ 1,268
Appraisal adjustments | Impaired loans (collateral dependent) | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans, collateral dependent, unobservable input value or range		5.00%
Appraisal adjustments | Impaired loans (collateral dependent) | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans, collateral dependent, unobservable input value or range		50.00%
[1]	Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses.

Fair Value Measurements - Balan

Fair Value Measurements - Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Carrying Amount
Financial assets:
Loans held for sale	$ 5,311	$ 601
Loans, net	3,106,980	2,531,845
Financial liabilities:
Borrowed funds	1,679	96,173
Subordinated debt	73,725	14,872
Carrying Amount | Certificates of deposit
Financial liabilities:
CDs (including brokered)	335,473	310,951
Fair Value
Financial assets:
Loans held for sale	5,337	609
Loans, net	3,146,344	2,542,577
Financial liabilities:
Borrowed funds	1,593	96,045
Subordinated debt	77,902	14,957
Fair Value | Certificates of deposit
Financial liabilities:
CDs (including brokered)	339,330	311,975
Fair Value, Inputs, Level 1
Financial assets:
Loans held for sale	0	0
Loans, net	0	0
Financial liabilities:
Borrowed funds	0	0
Subordinated debt	0	0
Fair Value, Inputs, Level 1 | Certificates of deposit
Financial liabilities:
CDs (including brokered)	0	0
Fair Value, Inputs, Level 2
Financial assets:
Loans held for sale	5,337	609
Loans, net	0	0
Financial liabilities:
Borrowed funds	1,593	96,045
Subordinated debt	0	0
Fair Value, Inputs, Level 2 | Certificates of deposit
Financial liabilities:
CDs (including brokered)	339,330	311,975
Fair Value, Inputs, Level 3
Financial assets:
Loans held for sale	0	0
Loans, net	3,146,344	2,542,577
Financial liabilities:
Borrowed funds	0	0
Subordinated debt	77,902	14,957
Fair Value, Inputs, Level 3 | Certificates of deposit
Financial liabilities:
CDs (including brokered)	$ 0	$ 0

Supplemental Cash Flow (Details

Supplemental Cash Flow (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019
Supplemental financial data:
Cash paid for: interest		$ 11,502	$ 16,222
Cash paid for: income taxes		11,883	8,760
Cash paid for: lease liability		921	875
Supplemental schedule of non-cash activity:
Net purchases of investment securities not yet settled		0	6,348
Transfer from loans to other real estate owned		0	255
ROU lease assets: operating leases	[1]	$ 0	$ 19,635
[1]	This represents the right of use ("ROU") lease asset that was recorded upon adoption of ASC 842 in 2019 and new leases added in the periods indicated