Enterprise Bancorp (EBTC) 10-Q8 May 152015 Q1 Quarterly reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
Document and Entity Information	Mar. 31, 2015	4-May-15
Document and Entity Information [Abstract]
Entity Registrant Name	ENTERPRISE BANCORP INC /MA/
Entity Central Index Key	1018399
Current Fiscal Year End Date	-19
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Amendment Flag	FALSE
Entity Common Stock, Shares Outstanding		10,325,963

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Cash and cash equivalents:
Cash and due from banks	$55,314	$30,044
Interest-earning deposits	35,846	10,102
Total cash and cash equivalents	91,160	40,146
Investment securities at fair value	240,068	245,065
Federal Home Loan Bank Stock	4,239	3,357
Loans held for sale	1,125	2,371
Loans, less allowance for loan losses of $27,803 at March 31, 2015, and $27,121 at December 31, 2014	1,654,317	1,645,483
Premises and equipment	30,070	30,370
Accrued interest receivable	7,001	6,733
Deferred income taxes, net	12,368	12,852
Bank-owned life insurance	16,415	16,315
Prepaid income taxes	0	770
Prepaid expenses and other assets	6,311	13,110
Goodwill	5,656	5,656
Total assets	2,068,730	2,022,228
Liabilities
Deposits	1,865,294	1,768,546
Borrowed funds	900	58,900
Subordinated debt	14,810	10,825
Accrued expenses and other liabilities	15,322	16,441
Income taxes payable	632	0
Accrued interest payable	284	566
Total liabilities	1,897,242	1,855,278
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; 20,000,000 shares authorized; 10,323,539 shares issued and outstanding at March 31, 2015 (including 148,490 shares of unvested participating restricted awards), and 10,207,943 shares issued and outstanding at December 31, 2014 (including 157,694 shares of unvested participating restricted awards)	103	102
Additional paid-in-capital	58,529	57,130
Retained earnings	108,292	105,951
Accumulated other comprehensive income	4,564	3,767
Total stockholders' equity	171,488	166,950
Total liabilities and stockholders' equity	$2,068,730	$2,022,228

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Allowance for loan losses	$27,803	$27,121
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	10,323,539	10,207,943
Common stock, shares outstanding	10,323,539	10,207,943
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Unvested participating restricted stock awards	148,490	157,694

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Interest and dividend income:
Loans and loans held for sale	$18,574	$17,176
Investment securities	1,225	1,022
Other interest-earning assets	32	33
Total interest and dividend income	19,831	18,231
Interest expense:
Deposits	992	1,001
Borrowed funds	21	22
Subordinated debt	372	294
Total interest expense	1,385	1,317
Net interest income	18,446	16,914
Provision for loan losses	625	200
Net interest income after provision for loan losses	17,821	16,714
Non-interest income:
Investment advisory fees	1,177	1,104
Deposit and interchange fees	1,154	1,198
Income on bank-owned life insurance,net	100	108
Net gains on sales of investment securities	900	488
Gains on sales of loans	156	73
Other income	546	508
Total non-interest income	4,033	3,479
Non-interest expense:
Salaries and employee benefits	9,581	9,074
Occupancy and equipment expenses	1,960	1,696
Technology and telecommunications expenses	1,417	1,262
Advertising and public relations expenses	730	586
Audit, legal and other professional fees	359	349
Deposit insurance premiums	293	265
Supplies and postage expenses	258	264
Investment advisory and custodial expenses	46	138
Other operating expenses	1,566	1,191
Total non-interest expense	16,210	14,825
Income before income taxes	5,644	5,368
Provision for income taxes	2,024	1,862
Net income	$3,620	$3,506
Basic earnings per share	$0.35	$0.35
Diluted earnings per share	$0.35	$0.35
Basic weighted average common shares outstanding	10,243,044	10,030,111
Diluted weighted average common shares outstanding	10,310,474	10,119,266

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$3,620	$3,506
Other comprehensive income, net of taxes:
Gross unrealized holding gains on investments arising during the period	2,107	1,488
Income tax expense	-724	-542
Net unrealized holding gains, net of tax	1,383	946
Less: Reclassification adjustment for net gains included in net income
Net realized gains on sales of securities during the period	900	488
Income tax expense	-314	-170
Reclassification adjustment for gains realized, net of tax	586	318
Total other comprehensive income	797	628
Comprehensive income	$4,417	$4,134

Consolidated_Statement_of_Chan

Consolidated Statement of Changes in Stockholders' Equity (USD $)	Total	Common stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income
In Thousands, unless otherwise specified	Total	Common stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income
Balance, beginning at Dec. 31, 2014	$166,950	$102	$57,130	$105,951	$3,767
Increase (Decrease) in Stockholders' Equity
Net income	3,620			3,620
Other comprehensive income, net	797				797
Tax benefit from exercise of stock options	4		4
Common stock dividend paid ($0.125 per share)	-1,279			-1,279
Common stock issued under dividend reinvestment and stock purchase plan	368	0	368
Stock-based compensation	648	1	647
Stock options exercised, net	380	0	380
Balance, ending at Mar. 31, 2015	$171,488	$103	$58,529	$108,292	$4,564

Consolidated_Statement_of_Chan1

Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2015
Statement of Stockholders' Equity [Abstract]
Common stock dividend paid, per share	$0.13

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities
Net income	$3,620	$3,506
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for loan losses	625	200
Depreciation and amortization	1,389	1,384
Stock-based compensation expense	488	481
Mortgage loans originated for sale	-6,729	-3,537
Proceeds from mortgage loans sold	8,131	3,480
Net gains on sales of loans	-156	-73
Net gains on sales of OREO	-154	0
Net gains on sales of investments	-900	-488
Income on bank-owned life insurance,net	-100	-108
Changes in:
Accrued interest receivable	-268	-202
Prepaid expenses and other assets	6,807	-3,900
Deferred income taxes	74	0
Accrued expenses and other liabilities	-228	-1,506
Subordinated debt issuance costs	-190	0
Accrued interest payable	-282	-302
Net cash provided by (used in) operating activities	12,127	-1,065
Cash flows from investing activities:
Proceeds from sales of investment securities available for sale	10,151	2,064
Net purchases from FHLB capital stock	-882	0
Proceeds from maturities, calls and pay-downs of investment securities	6,443	11,905
Purchase of investment securities	-9,877	-7,204
Net increase in loans	-9,459	-24,508
Additions to premises and equipment, net	-786	-745
Proceeds from OREO sales and payments	901	0
Net cash used in investing activities	-3,509	-18,488
Cash flows from financing activities:
Net increase in deposits	96,748	42,574
Net decrease in borrowed funds	-58,000	-29,050
Repayment of subordinated debt	-10,825	0
Proceeds from issuance of subordinated debt	15,000	0
Cash dividends paid	-1,279	-1,201
Proceeds from issuance of common stock	368	302
Proceeds from the exercise of stock options	380	493
Tax benefit from the exercise of stock options	4	3
Net cash provided by financing activities	42,396	13,121
Net increase (decrease) in cash and cash equivalents	51,014	-6,432
Cash and cash equivalents at beginning of period	40,146	53,733
Cash and cash equivalents at end of period	91,160	47,301
Supplemental financial data:
Cash Paid For: Interest	1,667	1,619
Cash Paid For: Income Taxes	587	620
Supplemental schedule of non-cash investing activity:
Net purchases of investment securities not yet settled	$2,237	$95

Summary_of_Significant_Account

Summary of Significant Accounting Policies	3 Months Ended
Summary of Significant Accounting Policies	Mar. 31, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies

	(a) Organization of Holding Company and Basis of Presentation

	The accompanying unaudited consolidated interim financial statements and these notes should be read in conjunction with the December 31, 2014 audited consolidated financial statements and notes thereto contained in the 2014 Annual Report on Form 10-K of Enterprise Bancorp, Inc. (the “Company” or “Enterprise”), a Massachusetts corporation, as filed with the Securities and Exchange Commission (the “SEC”) on March 13, 2015. The Company has not changed its reporting policies from those disclosed in its 2014 Annual Report on Form 10-K.

	The Company’s unaudited consolidated interim financial statements include the accounts of the Company and its wholly owned subsidiary, Enterprise Bank and Trust Company (the “Bank”). The Bank is a Massachusetts trust company 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 Investment Services, LLC, organized under the laws of the State of Delaware for the purposes of engaging in insurance sales activities and offering 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 securities investment activities that the Bank itself would be allowed to conduct under applicable laws.

	The Company has 22 full service branches serving the greater Merrimack Valley and North Central regions of Massachusetts and Southern New Hampshire. Through the Bank and its subsidiaries, the Company offers a range of commercial and consumer loan products, and deposit and cash management services. The Company also offers investment advisory and wealth management, trust and insurance 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.

	Pursuant to the Accounting Standards Codification (“ASC”) Topic 810 “Consolidation of Variable Interest Entities,” issued by the Financial Accounting Standards Board (“FASB”), at December 31, 2014, the Company carried Junior Subordinated Debentures as a liability on its consolidated interim financial statements, along with the related interest expense. The debentures were issued by a statutory business trust (the “Trust”) created by the Company in March 2000 under the laws of the State of Delaware, and the trust preferred securities issued by the Trust, and the related non-interest expense, were excluded from the Company’s consolidated interim financial statements. In March 2015, the Company redeemed in full the Junior Subordinated Debentures, which in turned allowed the Trust to redeem in full the trust preferred securities. The Company also dissolved the Trust in April 2015. See Note 5, “Borrowed Funds and Subordinated Debt” below for further information on the Company’s subordinated debt.

	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 have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and the instructions for 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 year amounts in the unaudited consolidated financial statements and accompanying footnotes 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.

	(b) Critical Accounting 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 date 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 change over time due to changes in circumstances. Changes in those estimates resulting from continuing change in the economic environment and other factors will be reflected in the financial statements and results of operations in future periods.

	As discussed in the Company’s 2014 Annual Report on Form 10-K, the three most significant areas in which management applies critical assumptions and estimates that are particularly susceptible to change relate to the determination 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 consolidated financial statements included in the Company’s 2014 Annual Report on Form 10-K for significant accounting policies. The Company has not changed its significant accounting policies from those disclosed in its 2014 Annual Report filed on Form 10-K.

	(c) Reporting 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. The Company’s only other comprehensive income component is the net unrealized holding gains or losses on investments available-for-sale, net of deferred income taxes. Pursuant to Accounting Standards Update (“ASU”) No. 2013-02, Comprehensive Income (Topic 220): Reporting Amounts Reclassified Out of Accumulated Other Comprehensive Income, 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 securities are sold. When securities are sold, the reclassification of realized gains and losses on available-for-sale securities are included on the Consolidated Statements of Income under the “non-interest income” subheading on the line item “net gains on sales of investment securities” and the related income tax expense is included in the line item “provision for income taxes,” both of which are also detailed on the Consolidated Statements of Comprehensive Income under the subheading “reclassification adjustment for net gains included in net income.”

	(d) Restricted Investments

	As a member of the Federal Home Loan Bank of Boston (“FHLB”), the Company is required to purchase certain levels of FHLB capital stock at par value in association with the Company’s borrowing relationship from the FHLB. This stock is classified as a restricted investment and carried at cost, which management believes approximates fair value. FHLB stock represents the only restricted investment held by the Company.

	In conjunction with the other-than-temporary-impairment (“OTTI”) review on available-for-sale investments (See Note 2, “Investments,” for additional information), management also regularly reviews its holdings of FHLB stock for OTTI. Based on management’s periodic review, the Company has not recorded any OTTI charges on this investment to date. If it was determined that a write-down of FHLB stock was required, impairment would be recognized through a charge to earnings.

	(e) Income Taxes

	The Company uses the asset and liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are recognized for the future tax attributable to differences between the financial statement carrying amounts and the tax basis of assets and liabilities. The deferred tax assets and liabilities are reflected at currently enacted income tax rates applicable to the period in which the deferred tax assets or liabilities are expected to be realized or settled. As changes in tax laws or rates are enacted, deferred tax assets and liabilities will be adjusted accordingly through the provision for income taxes.

	The Company’s policy is to classify interest resulting from underpayment of income taxes as income tax expense in the first period the interest would begin accruing according to the provisions of the relevant tax law. The Company classifies penalties resulting from underpayment of income taxes as income tax expense in the period for which the Company claims or expects to claim an uncertain tax position or in the period in which the Company’s judgment changes regarding an uncertain tax position.

	The income tax provisions will differ from the expense that would result from applying the federal statutory rate to income before taxes, primarily due to the impact of tax exempt interest from certain investment securities, loans and bank owned life insurance.

	The Company did not have any unrecognized tax benefits accrued as income tax liabilities or receivables or as deferred tax items at March 31, 2015. The Company is subject to U.S. federal and state income tax examinations by taxing authorities for the 2011 through 2014 tax years.

	(f) Recent Accounting Pronouncements

	In April 2015, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2015-03, Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. The amendments in this ASU require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this ASU. Entities are required to apply the new guidance on a retrospective basis, wherein the balance sheet of each individual period presented should be adjusted to reflect the period-specific effects of applying the new guidance. For public business entities, the amendments are effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption of the amendments is permitted for financial statements that have not been previously issued. The Company early adopted this ASU as of January 1, 2015 in relation to the Company's Fixed-to-Floating Rate Subordinated Notes issued in January 2015. The adoption did not have a material impact on the Company's financial statements or results of operations.

	In January 2014, the FASB ASU No. 2014-04, Receivables - Troubled Debt Restructurings by Creditors (Subtopic 310-40) - Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. The amendments are intended to reduce diversity of practice by clarifying when a creditor should be considered to have received physical possession of residential real estate property collateralizing a residential mortgage loan, such that the loan should be removed, and the real estate property recognized, on the financial statements. Additionally, the amendments require interim and annual disclosure of both the amount of foreclosed residential real estate property held by the creditor and the recorded investment in collateralized residential mortgage loans that are in the process of foreclosure according to local requirements of the applicable jurisdiction. The amendments in this ASU are effective for public business entities for annual periods and interim reporting periods beginning after December 15, 2014. As this ASU primarily offers clarification of existing standards and added disclosures, the adoption of this ASU in the first quarter of 2015 did not have a material impact on the Company's financial statements or results of operations.

	In January 2014, the FASB issued ASU No. 2014-01, Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects. The amendments in this ASU apply to all reporting entities that invest in qualified affordable housing projects through limited liability entities that are flow through entities for tax purposes. The amendments in this ASU eliminate the effective yield election and permit reporting entities to make an accounting policy election to account for such investments using the proportional amortization method if certain conditions are met. The investor must recognize any subsequent impairment loss when it is more likely than not that the carrying amount of the investment will not be realized. Those not electing the proportional amortization method would account for the investment using the equity method or cost method. The decision to apply the proportional amortization method of accounting is an accounting policy decision that must be applied consistently to all qualifying affordable housing project investments rather than a decision to be applied to individual investments. A reporting entity must disclose information that enables users of its financial statements to understand the nature of such investments and the effect of the measurement, and the related tax credits, on its financial position and results of operations. The amendments in this ASU are to be applied retrospectively to all periods presented. A reporting entity that uses the effective yield method to account for its investments in qualified affordable housing projects before the date of adoption may continue to apply the effective yield method for those preexisting investments. The amendments in this ASU are effective for public business entities for annual periods and interim reporting periods beginning after December 15, 2014. The adoption by the Company of this ASU in the first quarter of 2015 did not have a material impact on the Company's financial statements or results of operations.

	For information regarding recent accounting pronouncements not yet adopted by the Company, see Item 2, “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” under the heading “Recent Accounting Pronouncements.”

Investments

Investments	3 Months Ended
	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Investments	Investments

	The amortized cost and carrying values of investment securities at the dates specified are summarized as follows:



			March 31, 2015
	(Dollars in thousands)		Amortized				Unrealized			Unrealized			Fair Value
			cost				gains			losses
	Federal agency obligations (1)		$	59,535			$	912		$	—		$	60,447

	Federal agency mortgage backed securities (MBS) (1)		84,914				1,429			303			86,040

	Municipal securities		72,674				1,956			47			74,583

	Corporate bonds		8,068				130			4			8,194

	Total fixed income securities		225,191				4,427			354			229,264

	Equity investments		7,845				2,962			3			10,804

	Total available for sale securities, at fair value		$	233,036			$	7,389		$	357		$	240,068




			December 31, 2014
	(Dollars in thousands)		Amortized				Unrealized			Unrealized			Fair Value
			cost				gains			losses
	Federal agency obligations(1)		$	59,518			$	318		$	24		$	59,812

	Federal agency mortgage backed securities (MBS) (1)		88,303				1,015			516			88,802

	Municipal securities		72,113				2,157			66			74,204

	Corporate bonds		7,937				61			26			7,972

	Total fixed income securities		227,871				3,551			632			230,790

	Equity investments		11,370				3,071			166			14,275

	Total available for sale securities, at fair value		$	239,241			$	6,622		$	798		$	245,065


	__________________________________________

	-1	These categories may include investments issued or guaranteed by government sponsored enterprises such as Fannie Mae (FNMA), Freddie Mac (FHLMC), Ginnie Mae (GNMA), Federal Farm Credit Bank, or one of several Federal Home Loan Banks. All agency MBS/Collateralized Mortgage Obligations (“CMOs”) investments owned by the Company are backed by residential mortgages.

	Included in the carrying amount of the federal agency MBS category were CMOs totaling $12.5 million and $13.3 million at March 31, 2015 and December 31, 2014, respectively.

	At March 31, 2015, the equity portfolio consisted primarily of investments in a diversified group of mutual funds, with a portion of the portfolio (approximately 16%) invested in individual common stock of entities in the financial services industry.

	Net unrealized appreciation and depreciation on investments available for sale, net of applicable income taxes, are reflected as a component of accumulated other comprehensive income.

	The net unrealized gain or loss in the Company’s fixed income 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 fixed income investments will also decline as the securities approach maturity, or if the issuer is credit impaired. Unrealized gains or losses will be recognized in the statements of income if the securities are sold. However, if an unrealized loss on a fixed income investment is deemed to be other than temporary, the credit loss portion is charged to earnings and the noncredit portion is recognized in accumulated other comprehensive income.

	The net unrealized gain or loss on equity securities will fluctuate based on changes in the market value of the mutual funds and individual securities held in the portfolio. Unrealized gains or losses will be recognized in the statements of income if the securities are sold. However, if an unrealized loss on an equity security is deemed to be other than temporary prior to a sale, the loss is charged to earnings.

	Management regularly reviews the portfolio for securities with unrealized losses that are other-than-temporarily impaired. During the three months ended March 31, 2015 and 2014, the Company did not record any fair value impairment charges on its investments. As of March 31, 2015, there were a total of 26 investments (fixed income and equity), with a fair market value of $25.9 million, in an unrealized loss position totaling $357 thousand, including unrealized losses of $310 thousand that have been temporarily impaired for 12 months or longer. Management attributes these unrealized losses to increases in current market yields compared to the yields at the time the investments were purchased by the Company. Management does not consider these investments to be other-than-temporarily impaired at March 31, 2015, because (1) the decline in market value is not attributable to credit quality for fixed income securities or a fundamental deterioration in the equity fund or issuers, and (2) the Company does not intend to, and it is more likely than not that it will not be required to, sell those investments prior to a market price recovery or maturity.

	In assessing the Company’s federal agency MBS investments and federal agency obligations, the contractual cash flows of these investments are guaranteed by an agency of the U.S. Government, and the agency that issued these securities is sponsored by the U.S. Government. Accordingly, it is expected that the securities would not be settled at a price less than the par value of the Company’s investments. Management's assessment of other fixed income investments within the portfolio includes reviews of market pricing, ongoing credit quality evaluations, assessment of the investment's materiality, and duration of the investments' unrealized loss position. In addition, the Company utilizes an outside registered investment adviser to manage the corporate and municipal bond portfolios, within prescribed guidelines set by management, and to provide assistance in assessing the credit risk of those portfolios. At March 31, 2015, the Company’s corporate and municipal bond portfolios did not contain any securities below investment grade, as reported by major credit rating agencies. For equities and funds, management's assessment includes the severity of the declines, whether it is unlikely that the security or fund will completely recover its unrealized loss within a reasonable time period and if the equity security or fund exhibits fundamental deterioration.

	The contractual maturity distribution at March 31, 2015 of total fixed income investments was as follows:



	Within One Year							After One, But Within					After Five, But Within				After Ten Years
								Five Years					Ten Years
	Amortized				Yields			Amortized			Yields		Amortized		Yields		Amortized		Yields
	Cost							Cost					Cost				Cost
At amortized cost:
Federal agency obligations	$	—			—	%		$	42,765		1.41	%	$	16,770	2.13	%	$	—	—	%

MBS	—				—	%		5,178			3.08	%	1,646		1.94	%	78,090		2.16	%

Municipal securities	3,999				2.96	%		24,625			3.29	%	25,022		3.78	%	19,028		4.06	%

Corporate bonds	150				0.47	%		4,763			1.64	%	3,155		2.89	%	—		—	%

Total fixed income securities	$	4,149			2.87	%		$	77,331		2.13	%	$	46,593	3.06	%	$	97,118	2.53	%


At fair value:
Total fixed income securities	$	4,195						$	78,792				$	47,808			$	98,469


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 carrying value of fixed income investments above are callable securities, comprised of municipal securities, federal agency obligations and corporate bonds totaling $39.1 million, which can be redeemed by the issuer prior to the maturity presented above. Management considers these early payment factors when evaluating the interest rate risk in the Company’s asset-liability management program.

From time to time, the Company may pledge securities as collateral for deposit account balances of municipal deposit customers, and for borrowing capacity with the FHLB and the Federal Reserve Bank of Boston (the “FRB”). The fair value of securities pledged as collateral for these purposes was $229.3 million at March 31, 2015.

See Note 9, “Fair Value Measurements,” below for further information regarding the Company’s fair value measurements for available-for-sale securities.

Loans

Loans	3 Months Ended
	Mar. 31, 2015
Receivables [Abstract]
Loans	Loans

	The Company specializes in lending to business entities, non-profit organizations, professionals and individuals. The Company’s primary lending focus is on the development of high quality commercial relationships achieved through active business development efforts, long-term relationships with established commercial developers, strong community involvement and focused marketing strategies. Loans made to businesses include commercial mortgage loans, construction and land development loans, secured and unsecured commercial loans and lines of credit, and standby letters of credit. The Company also originates equipment lease financing for businesses. Loans made to individuals include conventional residential mortgage loans, home equity loans and lines, residential construction loans on primary and secondary residences, and secured and unsecured personal loans and lines of credit. The Company manages its loan portfolio to avoid concentration by industry and loan size to lessen its credit risk exposure.

	See Note 4, “Allowance for Loan Losses,” for information on the Company's credit risk management, non-accrual, impaired and troubled debt restructured loans and the allowance for loan losses.

	Major classifications of loans at the periods indicated were as follows:



	(Dollars in thousands)		March 31,				December 31,
			2015				2014
	Commercial real estate		$	860,765			$	862,747

	Commercial and industrial		413,183				402,994

	Commercial construction		169,264				168,044

	Total commercial loans		1,443,212				1,433,785

	Residential mortgages		148,909				149,959

	Home equity loans and lines		81,852				80,018

	Consumer		9,855				10,708

	Total retail loans		240,616				240,685


	Gross loans		1,683,828				1,674,470

	Deferred loan origination fees, net		(1,708		)		(1,866		)
	Total loans		1,682,120				1,672,604

	Allowance for loan losses		(27,803		)		(27,121		)
	Net loans		$	1,654,317			$	1,645,483


	Loan Categories

	- Commercial loans:

	Commercial real estate loans include loans secured by both owner-use and non-owner occupied real estate. These loans are typically secured by a variety of commercial and industrial property types including one-to-four and multi-family apartment buildings, office or mixed-use facilities, strip shopping centers, or other commercial property and are generally guaranteed by the principals of the borrower. Commercial real estate loans generally have repayment periods of approximately fifteen to twenty-five years. Variable interest rate loans have a variety of adjustment terms and underlying interest rate indices, and are generally fixed for an initial period before periodic rate adjustments begin.

	Commercial and industrial loans include seasonal revolving lines of credit, working capital loans, equipment financing (including equipment leases), and term loans. Also included in commercial and industrial loans are loans partially guaranteed by the U.S. Small Business Administration ("SBA"), and loans under various programs and agencies. Commercial and industrial credits may be unsecured loans and lines to financially strong borrowers, loans secured in whole or in part by real estate unrelated to the principal purpose of the loan or secured by inventories, equipment, or receivables, and are generally guaranteed by the principals of the borrower. Variable rate loans and lines in this portfolio have interest rates that are periodically adjusted, with loans generally having fixed initial periods. Commercial and industrial loans have average repayment periods of one to seven years.

	Construction lenders work to cultivate long-term relationships with established commercial developers. Commercial construction loans include the development of residential housing and condominium projects, the development of commercial and industrial use property, and loans for the purchase and improvement of raw land. These loans are secured in whole or in part by underlying real estate collateral and are generally guaranteed by the principals of the borrowers. The Company limits the amount of financing provided to any single developer for the construction of properties built on a speculative basis. Funds for construction projects are disbursed as pre-specified stages of construction are completed. Regular site inspections are performed, prior to advancing additional funds, at each construction phase, either by experienced construction lenders on staff or by independent outside inspection companies. Commercial construction loans generally are variable rate loans and lines with interest rates that are periodically adjusted and generally have terms of one to three years.

	From time to time, the Company participates with other banks in the financing of certain commercial projects. Participating loans with other institutions provide banks the opportunity to retain customer relationships, while providing customers with larger credit vehicles than the individual bank might be willing or able to offer independently, while reducing credit risk exposure among each participating bank. In some cases, the Company may act as the lead lender, originating and servicing the loans, but participating out a portion of the funding to other banks. In other cases, the Company may participate in loans originated by other institutions. In each case, the participating bank funds a percentage of the loan commitment and takes on the related risk. In each case in which the Company participates in a loan, the rights and obligations of each participating bank are divided proportionately among the participating banks in an amount equal to their share of ownership and with equal priority among all banks. The balances participated out to other institutions are not carried as assets on the Company’s financial statements. Loans originated by other banks in which the Company is the participating institution are carried in the loan portfolio at the Company’s pro rata share of ownership. The Company performs an independent credit analysis of each commitment and a review of the participating institution prior to participation in the loan. Loans originated by other banks in which the Company is the participating institution amounted to $63.5 million at March 31, 2015 and $65.3 million at December 31, 2014.

	Standby 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 credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. If the letter of credit is drawn upon, a loan is created for the customer, generally a commercial loan, with the same criteria associated with similar commercial loans.

	- Residential loans:

	Enterprise originates conventional mortgage loans on one-to-four family residential properties. These properties may serve as the borrower’s primary residence, vacation homes, or investment properties. Loan to value limits vary, generally from 75% for multi-family, owner occupied properties, up to 97% for single family, owner-occupied properties, with mortgage insurance coverage required for loan-to-value ratios greater than 80% based on program parameters. In addition, financing is provided for the construction of owner-occupied primary and secondary residences. Residential mortgage loans may have terms of up to 30 years at either fixed or adjustable rates of interest. Fixed and adjustable rate residential mortgage loans are generally originated using secondary market underwriting and documentation standards.

	Depending on the current interest rate environment, management projections of future interest rates and the overall asset-liability management program of the Company, management may elect to sell those fixed and adjustable rate residential mortgage loans which are eligible for sale in the secondary market, or hold some or all of this residential loan production for the Company’s portfolio. Mortgage loans are generally not pooled for sale, but instead sold on an individual basis. The Company may retain or sell the servicing when selling the loans. Loans sold are subject to standard secondary market underwriting and eligibility representations and warranties over the life of the loan and are subject to an early payment default period covering the first four payments for certain loan sales. Loans classified as held for sale are carried as a separate line item on the balance sheet.
	*- Home equity loans and lines of credit:*

	Home equity term loans are originated for one-to-four family residential properties with maximum original loan to value ratios generally up to 80% of the assessed or appraised value of the property securing the loan. Home equity loan payments consist of monthly principal and interest based on amortization ranging from three to fifteen years. The rates may also be fixed for three to fifteen years.

	The Company originates home equity revolving lines of credit for one-to-four family residential properties with maximum original loan to value ratios generally up to 80% of the appraised value of the property securing the loan. Home equity lines generally have interest rates that adjust monthly based on changes in the Prime Rate, although minimum rates may be applicable. Some home equity line rates may be fixed for a period of time and then adjusted monthly thereafter. The payment schedule for home equity lines requires interest only payments for the first ten years of the lines. Generally at the end of ten years, the line may be frozen to future advances, and principal plus interest payments are collected over a fifteen-year amortization schedule or, for eligible borrowers meeting certain requirements, the line availability may be extended for an additional interest only period.

	- Consumer loans:

Consumer loans primarily consist of secured or unsecured personal loans, loans under energy efficiency financing programs in conjunction with Massachusetts public utilities, and overdraft protection lines on checking accounts extended to individual customers. The aggregate amount of overdrawn deposit accounts are reclassified as loan balances.

Loans serviced for others

At March 31, 2015 and December 31, 2014, the Company was servicing residential mortgage loans owned by investors amounting to $19.2 million and $19.3 million, respectively. Additionally, the Company was servicing commercial loans participated out to various other institutions amounting to $46.4 million and $44.8 million at March 31, 2015 and December 31, 2014, respectively. See the discussion above for further information regarding commercial participations.

Loans serving as collateral

Loans designated as qualified collateral and pledged to the FHLB for borrowing capacity are summarized below:



(Dollars in thousands)	March 31,				December 31,
	2015				2014
Commercial real estate	$	265,206			$	276,657

Residential mortgages	106,054				107,906

Home equity	15,661				15,677

Total loans pledged to FHLB	$	386,921			$	400,240

Allowance_For_Loan_Loss

Allowance For Loan Loss	3 Months Ended
	Mar. 31, 2015
Receivables [Abstract]
Allowance for Credit Losses	Allowance for Loan Loss

	While the Company manages its loan portfolio to avoid concentration by industry and loan size to lessen its credit risk exposure, inherent in the lending process is the risk of loss due to customer non-payment, or “credit risk.” The Company endeavors to minimize this risk through sound underwriting practices and the risk management function; however, management recognizes that loan losses will occur and that the amount of these losses will fluctuate depending on the risk characteristics of the loan portfolio and economic conditions.

	The allowance for loan losses is an estimate of probable credit risk inherent in the loan portfolio as of the specified balance sheet dates. The Company maintains the allowance at a level that it deems adequate to absorb all reasonably anticipated losses from specifically known and other credit risks associated with the portfolio. In making its assessment on the adequacy of the allowance, management considers several quantitative and qualitative factors that could have an effect on the credit quality of the portfolio including, individual assessment of larger and high risk credits, delinquency trends and the level of non-performing loans, impaired and restructured loans, net charge-offs, the growth and composition of the loan portfolio, expansion in geographic market area and the strength of the local and national economy, among other factors.

	Allowance for probable loan losses methodology

	On a quarterly basis, management prepares an estimate of the allowance necessary to cover estimated 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 groups 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 as reported in the 2014 Annual Report on Form 10-K. Refer to heading “Allowance for probable loan losses methodology” contained in Note 4 “Allowance For Loan Losses,” to the Company’s consolidated financial statements contained in the 2014 Annual Report on Form 10-K for further discussion of management’s methodology used to estimate the loan loss exposure inherent in the portfolio for purposes of establishing a sufficient allowance.

	The balances of loans as of March 31, 2015 by segment and evaluation method are summarized as follows:


	(Dollars in thousands)		Loans individually				Loans collectively				Total Loans
			evaluated for				evaluated for
			impairment				impairment
	Commercial real estate		$	14,662			$	846,103			$	860,765

	Commercial and industrial		10,968				402,215				413,183

	Commercial construction		2,711				166,553				169,264

	Residential		449				148,460				148,909

	Home equity		179				81,673				81,852

	Consumer		49				9,806				9,855

	Deferred Fees		—				(1,708		)		(1,708		)

	Total loans		$	29,018			$	1,653,102			$	1,682,120


	The balances of loans as of December 31, 2014 by segment and evaluation method are summarized as follows:


	(Dollars in thousands)		Loans individually				Loans collectively				Total Loans
			evaluated for				evaluated for
			impairment				impairment
	Commercial real estate		$	15,003			$	847,744			$	862,747

	Commercial and industrial		10,901				392,093				402,994

	Commercial construction		2,675				165,369				168,044

	Residential		465				149,494				149,959

	Home equity		180				79,838				80,018

	Consumer		28				10,680				10,708

	Deferred Fees		—				(1,866		)		(1,866		)

	Total loans		$	29,252			$	1,643,352			$	1,672,604


	Credit quality indicators

	Early detection of credit issues is critical to minimize credit losses. Accordingly, management regularly monitors internal credit quality indicators such as the risk classification of individual loans, adversely classified loans, past due and non-accrual loans, impaired and restructured loans, and the level of foreclosure activity, as well as trends in the general levels of these indicators. However, despite prudent loan underwriting and ongoing credit risk management, adverse changes within the Company's market area or deterioration in the local, regional or national economic conditions could negatively impact the portfolio's credit risk profile and the Company's asset quality in the future.

	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, to the more severe adverse classifications of “substandard,” “doubtful” and “loss” based on criteria established under banking regulations.

Loans classified as substandard include those loans characterized by the distinct possibility that the Company will sustain some loss if deficiencies are not corrected. These loans are inadequately protected by the sound net worth and paying capacity of the borrower; repayment has become increasingly reliant on collateral liquidation or reliance on guarantees; credit weaknesses are well-defined; and, borrower cash flow is insufficient to meet required debt service specified in loan terms and to meet other obligations, such as trade debt and tax payments.

Loans classified as doubtful have all the weaknesses inherent in a substandard rated loan with the added characteristic that the weaknesses make collection or full payment from liquidation, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. The probability of loss is extremely high, but because of certain important and reasonably specific pending factors which may work to the advantage and strengthening of the loan, its classification as an estimated loss is deferred until more exact status may be determined.

Loans classified as loss are generally considered uncollectible at present, although long term recovery of part or all of loan proceeds may be possible. These “loss” loans would require a specific loss reserve or charge-off.

Adversely classified loans may be accruing or in non-accrual status and may be additionally designated as impaired or restructured, or some combination thereof. Loans which are evaluated to be of weaker credit quality are reviewed on a more frequent basis by management.

The following tables present the Company's credit risk profile for each class of loan in its portfolio by internally assigned risk rating category at the periods indicated.


		March 31, 2015
		Adversely Classified												Not Adversely
(Dollars in thousands)		Substandard				Doubtful				Loss				Classified			Gross Loans
Commercial real estate		$	13,114			$	1,173			$	19			$	846,459		$	860,765

Commercial and industrial		11,268				97				56				401,762			413,183

Commercial construction		2,794				—				—				166,470			169,264

Residential		870				—				—				148,039			148,909

Home equity		453				—				—				81,399			81,852

Consumer		59				14				—				9,782			9,855

Total gross loans		$	28,558			$	1,284			$	75			$	1,653,911		$	1,683,828





		December 31, 2014
		Adversely Classified												Not Adversely
(Dollars in thousands)		Substandard				Doubtful				Loss				Classified			Gross Loans
Commercial real estate		$	11,409			$	1,188			$	19			$	850,131		$	862,747

Commercial and industrial		11,298				51				57				391,588			402,994

Commercial construction		2,759				—				—				165,285			168,044

Residential		1,133				—				—				148,826			149,959

Home equity		464				—				—				79,554			80,018

Consumer		48				—				—				10,660			10,708

Total gross loans		$	27,111			$	1,239			$	76			$	1,646,044		$	1,674,470



Total adversely classified loans amounted to 1.78% of total loans at March 31, 2015, as compared to 1.70% at December 31, 2014. At March 31, 2015, as compared to December 31, 2014, adversely classified balances increased slightly, primarily due to net increases in substandard commercial real estate, partially offset by additional credit upgrades and paydowns within the commercial and residential portfolios during the period.

Past due and non-accrual loans

Loans on which the accrual of interest has been discontinued are designated as non-accrual loans. Accrual of interest on loans is generally discontinued when a loan becomes contractually past due, with respect to interest or principal, by 90 days, or when reasonable doubt exists as to the full and timely collection of interest or principal. When a loan is placed on non-accrual status, all interest previously accrued but not collected is reversed against current period interest income. Interest payments received on loans in a non-accrual status are generally applied to principal on the books of the Company. Interest accruals are resumed on such loans only when payments are brought current and have remained current for a period of 180 days and when, in the judgment of management, the collectability of both principal and interest is reasonably assured. Additionally, deposit accounts overdrawn for 90 or more days are included in the consumer non-accrual balances below.

The following tables present age analysis of past due loans as of the dates indicated.


Balance at March 31, 2015
(Dollars in thousands)		Loans				Loans				Loans 90 or				Total Past			Current Loans			Gross
		30-59 Days				60-89 Days				More Days				Due Loans						Loans
		Past Due				Past Due				Past Due (non-
										accrual)
Commercial real estate		$	3,706			$	29			$	10,324			$	14,059		$	846,706		$	860,765

Commercial and industrial		1,417				—				6,437				7,854			405,329			413,183

Commercial construction		1,551				—				485				2,036			167,228			169,264

Residential		671				—				503				1,174			147,735			148,909

Home equity		256				—				233				489			81,363			81,852

Consumer		11				8				53				72			9,783			9,855

Total gross loans		$	7,612			$	37			$	18,035			$	25,684		$	1,658,144		$	1,683,828




Balance at December 31, 2014
(Dollars in thousands)		Loans				Loans				Loans 90 or				Total Past			Current Loans			Gross Loans
		30-59 Days				60-89 Days				More Days				Due Loans
		Past Due				Past Due				Past Due (non-
										accrual)
Commercial real estate		$	1,471			$	1,235			$	9,714			$	12,420		$	850,327		$	862,747

Commercial and industrial		1,184				101				5,950				7,235			395,759			402,994

Commercial construction		—				—				447				447			167,597			168,044

Residential		1,328				370				763				2,461			147,498			149,959

Home equity		29				—				245				274			79,744			80,018

Consumer		94				1				17				112			10,596			10,708

Total gross loans		$	4,106			$	1,707			$	17,136			$	22,949		$	1,651,521		$	1,674,470


At March 31, 2015 and December 31, 2014, all loans 90 days or more past due were carried as non-accrual. Included in the consumer non-accrual balances in the table above were $11 thousand and $1 thousand of overdraft deposit account balances 90 days or more past due at March 31, 2015 and December 31, 2014, respectively. Non-accrual loans which were not adversely classified amounted to $227 thousand at March 31, 2015 and $211 thousand at December 31, 2014. 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 increase in non-accrual balances at March 31, 2015, as compared to December 31, 2014, was primarily in the commercial real estate ($610 thousand) and commercial and industrial ($487 thousand) portfolios due primarily to several commercial relationships designated non-accrual during the period, partially offset by paydowns and upgrades. The increase in loans 30-59 days past due occurred primarily within the commercial portfolios at March 31, 2015, with the majority of these loans having subsequent payments made by mid-April.

The ratio of non-accrual loans to total loans amounted to 1.07% at March 31, 2015, 1.02% at December 31, 2014, and 1.10% at March 31, 2014.

At March 31, 2015, additional funding commitments for loans on non-accrual status totaled $240 thousand. The Company’s obligation to fulfill the additional funding commitments on non-accrual loans is generally contingent on the borrower’s compliance with the terms of the credit agreement. If the borrower is not in compliance, additional funding commitments may or may not be made at the Company’s discretion.

Impaired loans

Impaired loans are individually significant loans for which management considers it probable that not all amounts due (principal and interest) in accordance with the original contractual terms will be collected. The majority of impaired loans are included within the non-accrual balances; however, not every loan on non-accrual status has been designated as impaired. Impaired loans include loans that have been modified in a troubled debt restructuring ("TDR") loans. Impaired loans 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.

Management does not set any minimum delay of payments as a factor in reviewing for impaired classification. Management considers the individual payment status, net worth and earnings potential of the borrower, and the value and cash flow of the collateral as factors to determine if a loan will be paid in accordance with its contractual terms. An impaired or TDR loan classification will be considered for upgrade based on the borrower's sustained performance over time and their improving financial condition. Consistent with the criteria for returning non-accrual loans to accrual status, the borrower must demonstrate the ability to continue to service the loan in accordance the original or modified terms and, in the judgment of management, the collectability of the remaining balances, both principal and interest, are reasonably assured. In the case of TDR loans having had a modified interest rate, that rate must be at, or greater than, a market rate for a similar credit at the time of modification for an upgrade to be considered.

Impaired loans are individually evaluated for credit loss and a specific allowance reserve is assigned for the amount of the estimated credit loss. Refer to heading “Allowance for probable loan losses methodology” contained in Note 4 “Allowance For Loan Losses,” to the Company’s consolidated financial statements contained in the 2014 Annual Report on Form 10-K for further discussion of management’s methodology used to estimate specific reserves for impaired loans.

Total impaired loans amounted to $29.0 million and $29.3 million at March 31, 2015 and December 31, 2014, respectively. Total accruing impaired loans amounted to $11.2 million and $12.5 million at March 31, 2015 and December 31, 2014, respectively, while non-accrual impaired loans amounted to $17.8 million and $16.7 million as of March 31, 2015 and December 31, 2014, respectively.

The following tables set forth the recorded investment in impaired loans and the related specific allowance allocated as of the dated indicated.


Balance at March 31, 2015
(Dollars in thousands)		Unpaid				Total recorded				Recorded				Recorded			Related specific
		contractual				investment in				investment				investment			allowance
		principal balance				impaired loans				with no				with
										allowance				allowance
Commercial real estate		$	16,927			$	14,662			$	14,464			$	198		$	165

Commercial and industrial		12,101				10,968				5,635				5,333			1,951

Commercial construction		2,901				2,711				1,146				1,565			528

Residential		530				449				449				—			—

Home equity		181				179				47				132			22

Consumer		50				49				—				49			49

Total		$	32,690			$	29,018			$	21,741			$	7,277		$	2,715




Balance at December 31, 2014
(Dollars in thousands)		Unpaid				Total recorded				Recorded				Recorded			Related specific
		contractual				investment in				investment				investment			allowance
		principal balance				impaired loans				with no				with
										allowance				allowance
Commercial real estate		$	17,182			$	15,003			$	14,800			$	203		$	68

Commercial and industrial		11,991				10,901				5,461				5,440			1,516

Commercial construction		2,862				2,675				1,150				1,525			519

Residential		537				465				465				—			—

Home equity		183				180				—				180			26

Consumer		28				28				—				28			28

Total		$	32,783			$	29,252			$	21,876			$	7,376		$	2,157


The following table presents the average recorded investment in impaired loans and the related interest recognized during the three month periods indicated.



		Three Months Ended March 31, 2015								Three Months Ended March 31, 2014
(Dollars in thousands)		Average recorded				Interest income				Average recorded				Interest income
		investment				recognized				investment				recognized
Commercial real estate		$	15,479			$	45			$	14,158			$	50

Commercial and industrial		11,256				34				10,828				38

Commercial construction		2,624				26				3,305				26

Residential		459				—				759				—

Home equity		179				1				108				—

Consumer		49				—				24				—

Total		$	30,046			$	106			$	29,182			$	114


At March 31, 2015, additional funding commitments for impaired loans totaled $285 thousand. The Company's obligation to fulfill the additional funding commitments on impaired loans is generally contingent on the borrower's compliance with the terms of the credit agreement. If the borrower is not in compliance, additional funding commitments may or may not be made at the Company's discretion.

Troubled debt restructures

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 Bank grants the borrower a concession on the terms, that would not otherwise be considered. Typically, such concessions may consist of a reduction in interest rate to a below market rate, taking into account the credit quality of the note, or a deferment or reduction of payments (principal or interest) which materially alters the Bank’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. TDR loans are included in the impaired loan category and, as such, these loans are individually evaluated and a specific reserve is assigned for the amount of the estimated credit loss.

Total TDR loans, included in the impaired loan balances above, as of March 31, 2015 and December 31, 2014, were $18.7 million and $19.5 million, respectively. TDR loans on accrual status amounted to $10.6 million and $11.9 million at March 31, 2015 and December 31, 2014, respectively. TDR loans included in non-performing loans amounted to $8.0 million and $7.5 million at March 31, 2015 and December 31, 2014, respectively. The Company continues to work with commercial relationships and enters into loan modifications to the extent deemed to be necessary or appropriate while attempting to achieve the best mutual outcome given the current economic environment.

At March 31, 2015, additional funding commitments for TDR loans totaled $54 thousand. The Company's obligation to fulfill the additional funding commitments on TDR loans is generally contingent on the borrower's compliance with the terms of the credit agreement. If the borrower is not in compliance, additional funding commitments may or may not be made at the Company's discretion.

Loans modified as troubled debt restructurings during the three month period ended March 31, 2015 are detailed below.



		Three months ended March 31, 2015
(Dollars in thousands)		Number of			Pre-modification				Post-modification
		restructurings			outstanding recorded				outstanding recorded
					investment				investment
Commercial real estate		—			$	—			$	—

Commercial and industrial		4			869				869

Commercial construction		—			—				—

Residential		—			—				—

Home equity		—			—				—

Consumer		—			—				—

Total		4			$	869			$	869



There were no subsequent charge-offs associated with the TDRs noted in the table above during the three months ended March 31, 2015. At March 31, 2015, there were specific reserves of $61 thousand allocated to the TDRs entered into during the 2015 period as management considered it likely that the majority of principal would ultimately be collected. Interest payments received on non-accruing TDRs in the table above which were applied to principal and not recognized in interest income during the three months ended March 31, 2015 amounted to $1 thousand.

There were no loans modified as TDRs within the 12 month period previous to March 31, 2015 for which there was a subsequent payment default during the three months ended March 31, 2015.

Loans modified as troubled debt restructurings during the three month period ended March 31, 2014 are detailed below.



		Three months ended March 31, 2014
(Dollars in thousands)		Number of			Pre-modification				Post-modification
		restructurings			outstanding recorded				outstanding recorded
					investment				investment
Commercial real estate		1			$	453			$	446

Commercial and industrial		2			70				68

Commercial construction		—			—				—

Residential		—			—				—

Home equity		—			—				—

Consumer		—			—				—

Total		3			$	523			$	514


There were no subsequent charge-offs associated with the TDRs noted in the table above during the three months ended March 31, 2014. At March 31, 2014, there were no specific reserves allocated to the TDRs entered into during the 2014 period, as management considered it likely that the principal would ultimately be collected. Interest payments received on non-accruing TDRs in the table above which were applied to principal and not recognized in interest income during the three months ended March 31, 2014 amounted to $8 thousand.

There were no loans modified as TDRs within the 12 month period previous to March 31, 2014 for which there was a subsequent payment default during the three months ended March 31, 2014.

Other real estate owned (“*OREO*”)

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 generally recorded at the lesser of the loan’s remaining principal balance, net of any unamortized deferred fees, or the estimated fair value of the property acquired, less estimated costs to sell. 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 carrying value of OREO at March 31, 2015 was $114 thousand and consisted of one property, and as of December 31, 2014 was $861 thousand and consisted of three properties.

There were no additions to, or subsequent write downs of, OREO during the three months ended March 31, 2015. There were two sales of OREO resulting in $154 thousand in net gains on sales during the three months ended March 31, 2015. There were no sales or subsequent write downs of OREO during the three months ended March 31, 2014.

Allowance for loan loss activity

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 $27.8 million at March 31, 2015, compared to $27.1 million at December 31, 2014, and $26.2 million at March 31, 2014. The allowance for loan losses to total loans ratio was 1.65% at March 31, 2015 compared to 1.62% at December 31, 2014 and 1.69% at March 31, 2014. The increase in the overall allowance to total loan ratio at March 31, 2015 primarily resulted from the increase in specific reserves. Specific reserves increased due primarily to additional reserves for newly impaired loans and changes in underlying collateral values during the period.

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 credit risks associated with the portfolio as of March 31, 2015.

Changes in the allowance for loan losses by segment for the three months ended March 31, 2015 are presented below:



(Dollars in thousands)		Cmml Real				Cmml and				Cmml				Resid.			Home			Consumer			Total
		Estate				Industrial				Constr				Mortgage			Equity
Beginning Balance at December 31, 2014		$	12,664			$	9,245			$	3,384			$	989		$	608		$	231		$	27,121

Provision		78				530				11				(29		)	7			28			625

Recoveries		5				84				13				—			—			8			110

Less: Charge offs		—				17				—				—			—			36			53

Ending Balance at March 31, 2015		$	12,747			$	9,842			$	3,408			$	960		$	615		$	231		$	27,803

Ending allowance balance:
Allotted to loans individually evaluated for impairment		$	165			$	1,951			$	528			$	—		$	22		$	49		$	2,715

Allotted to loans collectively evaluated for impairment		$	12,582			$	7,891			$	2,880			$	960		$	593		$	182		$	25,088


Changes in the allowance for loan losses by segment for the three months ended March 31, 2014 are presented below:


(Dollars in thousands)		Cmml Real				Cmml and				Cmml				Resid.			Home			Consumer			Total
		Estate				Industrial				Constr				Mortgage			Equity
Beginning Balance at December 31, 2013		$	13,174			$	8,365			$	3,493			$	1,057		$	653		$	225		$	26,967

Provision		(101		)		118				96				119			(19		)	(13		)	200

Recoveries		—				26				—				—			—			12			38

Less: Charge offs		203				812				—				—			—			18			1,033

Ending Balance at March 31, 2014		$	12,870			$	7,697			$	3,589			$	1,176		$	634		$	206		$	26,172

Ending allowance balance:
Allotted to loans individually evaluated for impairment		$	214			$	2,051			$	847			$	156		$	19		$	21		$	3,308

Allotted to loans collectively evaluated for impairment		$	12,656			$	5,646			$	2,742			$	1,020		$	615		$	185		$	22,864

Borrowed_Funds_and_Subordinate

Borrowed Funds and Subordinated Debt	3 Months Ended
Borrowed Funds and Subordinated Debt	Mar. 31, 2015
Debt Disclosure [Abstract]
Borrowed Funds and Subordinated Debt	Borrowed Funds and Subordinated Debt

	Borrowed funds consisted of FHLB borrowings of $900 thousand at March 31, 2015, compared to $58.9 million at December 31, 2014.

	The Company also carried subordinated debt of $14.8 million at March 31, 2015, and $10.8 million at December 31, 2014.

	The subordinated debt carried at March 31, 2015 consisted of $15.0 million in aggregate principal amount of Fixed-to-Floating Rate Subordinated Notes (the “Notes”) issued in January 2015, in a private placement to an accredited investor. The Notes, which are intended to qualify as Tier 2 capital for regulatory purposes, mature on January 30, 2030, (the “Maturity Date”) and are callable by the Company, subject to regulatory approval, at a premium beginning January 30, 2020, and at par beginning January 30, 2025. The Notes pay interest at a fixed rate of 6.00% per annum through January 30, 2025, and beginning on January 31, 2025 through the Maturity Date, or any early redemption date, the interest rate on the Notes will adjust monthly at an interest rate of 3.90% plus 30-day LIBOR. Note issuance costs were $190 thousand, and have been netted against the subordinated debt on the balance sheet in accordance with recent accounting guidance which the Company adopted in the first quarter of 2015. These costs and are being amortized over the life of the Notes.

	In March 2000, Enterprise (MA) Capital Trust I (the “Trust”), a subsidiary of Enterprise Bancorp, issued $10.5 million of 10.875% trust preferred securities that mature in 2030 and were callable, at a premium. The proceeds from the sale of the trust preferred securities were used by the Trust, along with the Company’s $325 thousand capital contribution, to acquire $10.8 million in aggregate principal amount of the Company’s 10.875% Junior Subordinated Debt Securities (the "Debt") that mature in 2030 and were callable; this comprised the subordinate debt carried at December 31, 2014.

	In March 2015, the Company redeemed the Debt in full using proceeds from the $15.0 million in Notes issued in January 2015, which in turned allowed the Trust to redeem in full the trust preferred securities.

Supplemental_Retirement_Plan_a

Supplemental Retirement Plan and Other Postretirement Benefit Obligations	3 Months Ended
	Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Supplemental Retirement Plan and Other Postretirement Benefit Obligations	Supplemental Retirement Plan and Other Postretirement Benefit Obligations

	Supplemental Retirement Plan

	The Company has salary continuation agreements with two of its active executive officers, and one former executive officer who currently works on a part time basis. These 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 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 plan.

	This non-qualified plan represents a direct liability of the Company, and as such has no specific assets set aside to settle the benefit obligation. The funded status is the aggregate amount accrued, or the “accumulated benefit obligation,” which 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.

	Total net periodic benefit cost, comprised of interest cost only, was $31 thousand for the three months ended March 31, 2015, compared to $36 thousand for the three months ended March 31, 2014.

	Benefits paid amounted to $69 thousand for both the three month periods ended March 31, 2015 and March 31, 2014. The Company anticipates accruing an additional $94 thousand to the plan during the remainder of 2015.

	Supplemental Life Insurance

	For certain senior and executive officers on whom the Bank owns bank owned life insurance ("BOLI"), the Company has provided supplemental life insurance through split-dollar life insurance arrangements, which provides a death benefit to the officer’s designated beneficiaries.

	The Company has recognized a liability for future benefits associated with the supplemental life insurance plan, which is a non-qualified plan, which provides a benefit to an employee that extends to postretirement periods.

	This plan represents a direct liability of the Company, and as such has no specific assets set aside to settle the benefit obligation. The funded status is the aggregate amount accrued, or the “accumulated postretirement benefit obligation,” which is the present value of the post-retirement benefits associated with this arrangement.

	The total net periodic benefit cost, which was comprised primarily of interest costs, amounted to $18 thousand for both the three months ended March 31, 2015 and March 31, 2014.

StockBased_Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation

	The Company has individual stock incentive plans and has not changed the general terms and conditions of these plans from those disclosed in the Company’s 2014 Annual Report on Form 10-K.

	The Company’s stock-based compensation expense 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 directors included in other operating expenses. Total stock-based compensation expense was $488 thousand for the three months ended March 31, 2015, compared to $481 thousand for the three months ended March 31, 2014.

	Stock Option Awards

	The Company recognized stock-based compensation expense related to stock option awards of $97 thousand for the three months ended March 31, 2015, compared to $104 thousand for the three months ended March 31, 2014.

	The Company utilizes the Black-Scholes option valuation model in order to determine the per share grant date fair value of option grants.

	The table below provides a summary of the options granted in 2015 and 2014.



		Three Months Ended March 31
		2015			2014
	Options granted	27,115			31,229

	Term in years	10			10

	Average assumptions used in the fair value model:
	Expected volatility	47		%	47		%
	Expected dividend yield	2.89		%	2.88		%
	Expected life in years	7			7

	Risk-free interest rate	1.95		%	2.19		%
	Market price on date of grant	$	21.03		$	20.29

	Per share weighted average fair value	$	8.51		$	8.32

	Fair value as a percentage of market value at grant date	40		%	41		%

	Options granted during the first three months of 2015 and 2014 vest 50% in year two and 50% in year four, on the anniversary date of the awards. Vested options are only exercisable while the employee remains employed with the Bank and for a limited time thereafter. If a grantee’s employment is terminated for any reason, then any stock options granted that have not vested as of the time of such termination generally must be forfeited, unless the Compensation Committee or the Board of Directors, as the case may be, waives such forfeiture requirement.

	Refer to Note 11 “Stock-Based Compensation Plans” in the Company’s 2014 Annual Report on Form 10-K for a further description of the assumptions used in the valuation model.

	Stock Awards

	Stock-based compensation expense recognized in association with stock awards amounted to $309 thousand for the three months ended March 31, 2015 compared to $308 thousand for the three months ended March 31, 2014.

	In January 2014, the Company granted 2,142 shares of fully vested stock to employees as anniversary awards at a grant date fair market value of $20.95 per share. There were no fully vested stock awards granted in in the three months ended March 31, 2015.

	Restricted stock awards are granted at the market price on the date of the grant. Employee awards generally vest over four years in equal portions beginning on or about the first anniversary date of the award. Employee performance based awards vest upon the Company achieving certain predefined performance objectives. Director awards generally vest over two years in equal portions beginning on or about the first anniversary date of the award.

	The table below provides a summary of restricted stock awards granted in 2015 and 2014.


		Three Months Ended March 31
	Restricted Stock Awards	2015			2014
	Two Year Vesting	7,276			6,660

	Four Year Vesting	17,181			19,167

	Performance-Based Vesting	30,262			33,017

	Total Restricted Stock Awards	54,719			58,844


	Weighted average grant date fair value	$	21.03		$	20.29


	If a grantee’s employment or other service relationship, such as service as a director, is terminated for any reason, then any shares of restricted stock granted that have not vested as of the time of such termination generally must be forfeited, unless the Compensation Committee or the Board of Directors, as the case may be, waives such forfeiture requirement.

The restricted stock awards allow for the 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.

Stock in Lieu of Directors’ Fees

In addition to restricted stock awards discussed above, the members of the Company’s Board of Directors 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 directors’ fees amounted to $82 thousand for the three months ended March 31, 2015, compared to $69 thousand for the three months ended March 31, 2014, and is included in other operating expenses. In January 2015, directors were issued 11,612 shares of common stock in lieu of 2014 annual cash fees of $242 thousand at a market value price of $20.84 per share, the market value of the common stock on the opt-in measurement date of January 2, 2014.

Earnings_Per_Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings Per Share	Earnings per share

	Basic earnings per share are calculated by dividing net income 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. 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 March 31,
		2015	2014
	Basic weighted average common shares outstanding	10,243,044	10,030,111

	Dilutive shares	67,430	89,155

	Diluted weighted average common shares outstanding	10,310,474	10,119,266


	For the three months ended March 31, 2015, there were no stock options outstanding, which were excluded from the year-to-date calculation of diluted earnings per share due to the exercise price of these options exceeding the average market price of the Company’s common stock for the period.

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2015
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 on the basis of 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:



			March 31, 2015				Fair Value Measurements using:
	(Dollars in thousands)		Fair Value				(level 1)				(level 2)			(level 3)
	Assets measured on a recurring basis:

	Fixed income securities		$	229,264			$	—			$	229,264		$	—

	Equity securities		10,804				10,804				—			—

	FHLB stock		4,239				—				—			4,239

	Assets measured on a non-recurring basis:

	Impaired loans (collateral dependent)		4,497				—				—			4,497

	Other real estate owned		114				—				—			114




			December 31,				Fair Value Measurements using:
			2014
	(Dollars in thousands)		Fair Value				(level 1)				(level 2)			(level 3)
	Assets measured on a recurring basis:

	Fixed income securities		$	230,790			$	—			$	230,790		$	—

	Equity securities		14,275				14,275				—			—

	FHLB stock		3,357				—				—			3,357

	Assets measured on a non-recurring basis:

	Impaired loans (collateral dependent)		5,174				—				—			5,174

	Other real estate owned		861				—				—			861


	The Company did not have cause to transfer any assets between the fair value measurement levels during the three months ended March 31, 2015, or the year ended December 31, 2014. There were no liabilities measured at fair value on a recurring or non-recurring basis as of March 31, 2015, or December 31, 2014.

	All of the Company's fixed income investments and equity securities that are considered “available for sale” are carried at fair value. The fixed income category above includes federal agency obligations, federal agency MBS, municipal securities and corporate bonds as held at those dates. The Company utilizes third-party pricing vendors to provide valuations on its fixed income 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 fixed income 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; this stock is classified as a restricted investment and carried at cost which management believes approximates fair value; therefore, these securities are categorized as Level 3 measures. See Note 1, "Summary of Significant Accounting Policies," Item (d) for further information regarding the Company's fair value assessment of FHLB capital stock.

	Impaired loan balances in the table above represent those collateral dependent impaired commercial loans where management has estimated the 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 impaired loans are categorized as Level 3 within the fair value hierarchy. A specific allowance is assigned to the collateral dependent impaired loan for the amount of management’s estimated credit loss. The specific allowances assigned to the collateral dependent impaired loans at March 31, 2015 amounted to $2.0 million compared to $1.7 million at December 31, 2014.

	When OREO property is acquired, it is generally recorded at the lesser of the loan’s remaining principal balance, net of unamortized deferred fees, or the estimated fair value of the property acquired, less estimated costs to sell. The estimated fair value is based on market appraisals and the Company’s internal analysis. Certain inputs used in appraisals or the Company's internal analysis, are not always observable, and therefore, OREO may be categorized as Level 3 within the fair value hierarchy. There were two sales of OREO resulting in $154 thousand in net gains on sales and no subsequent write downs of OREO during the three months ended March 31, 2015. There were no sales or subsequent write downs of OREO during the three months ended March 31, 2014.

	The following table presents additional quantitative information about assets measured at fair value on a recurring and 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 March 31, 2015.



	(Dollars in thousands)		Fair Value		Valuation Technique		Unobservable Input		Unobservable Input Value or Range
	Assets measured on a recurring basis:
	FHLB stock		$4,239		FHLB Stated Par Value		N/A		N/A
Assets measured on a non-recurring basis:
Impaired loans (collateral dependent)		$4,497		Appraisal of collateral		Appraisal adjustments (1)		5% - 50%
Other real estate owned		$114		Appraisal of collateral		Appraisal adjustments (1)		0% - 30%

-1	Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses.

Other Guarantees and Commitments

Standby 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 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 balance sheet at March 31, 2015 and December 31, 2014 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 represent the Company’s only derivative instruments and 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 March 31, 2015 and December 31, 2014, the estimated fair value of the Company’s derivative instruments was considered to be immaterial.

Estimated Fair Values of Assets and Liabilities

In addition to disclosures regarding the measurement of assets and liabilities carried at fair value on the 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 balance sheet. In cases where quoted fair values are not available, fair values are based upon estimates using various valuation techniques. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows.

The following methods and assumptions were used by the Company in estimating fair values of its financial instruments:

Loans held for sale: Loans held for sale are recorded at the lower of aggregate amortized cost or market value. The fair value is based on comparable market prices for loans with similar rates and terms.

Loans: The fair value of loans was determined using discounted cash flow analysis, using interest rates currently being offered by the Company. The incremental credit risk for adversely classified loans was considered in the determination of the fair value of the loans. This method of estimating fair value does not incorporate the exit price concept of fair value.

Commitments: The fair values of the unused portion of lines of credit and letters of credit were estimated to be the fees currently charged to enter into similar agreements. Commitments to originate non-mortgage loans were short-term and were at current market rates and estimated to have no significant change in fair value.

Financial liabilities: The fair values of certificates of deposit and borrowings were estimated using discounted cash flow analysis using rates offered by the Bank, or advance rates offered by the FHLB on March 31, 2015 and December 31, 2014 for similar instruments. The fair value of subordinated debt was estimated using discounted cash flow analysis using a market rate of interest at March 31, 2015 and December 31, 2014.

Limitations: The estimates of fair value of financial instruments were based on information available at March 31, 2015 and December 31, 2014 and are not indicative of the fair market value of those instruments as of the date of this Quarterly Report on Form 10-Q. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument. The fair value of the Company's time deposit liabilities do not take into consideration the value of the Company's long-term relationships with depositors, which may have significant value.

Because no active market exists for a portion of the Company’s financial instruments, fair value estimates were based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments, and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in assumptions could significantly affect the estimates.

Fair value estimates were based on existing on- and off-balance sheet financial instruments without an attempt to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments, including premises and equipment and foreclosed real estate.

In addition, the tax ramifications related to the realization of the unrealized appreciation and depreciation can have a significant effect on fair value estimates and have not been considered in any of the estimates. Accordingly, the aggregate fair value amounts presented do not represent the underlying value of the Company.

The carrying values, estimated fair values and placement in the fair value hierarchy of the Company’s financial instruments(1) for which fair value is only disclosed but not recognized on the balance sheet at the dates indicated are summarized as follows:



		March 31, 2015								Fair value measurement
(Dollars in thousands)		Carrying				Fair Value				Level 1 inputs			Level 2 Inputs			Level 3 Inputs
		Amount
Financial assets:

Loans held for sale		$	1,125			$	1,129			$	—		$	1,129		$	—

Loans, net		1,654,317				1,675,818				—			—			1,675,818

Financial liabilities:

Certificates of deposit (including brokered)		298,295				297,862				—			297,862			—

Borrowed funds		900				900				—			900			—

Subordinated debt		14,810				14,138				—			—			14,138




		December 31, 2014								Fair value measurement
(Dollars in thousands)		Carrying				Fair Value				Level 1 inputs			Level 2 Inputs			Level 3 Inputs
		Amount
Financial assets:

Loans held for sale		$	2,371			$	2,381			$	—		$	2,381		$	—

Loans, net		1,645,483				1,668,863				—			—			1,668,863

Financial liabilities:

Certificates of deposit (including brokered)		263,779				262,774				—			262,774			—

Borrowed funds		58,900				58,899				—			58,899			—

Subordinated debt		10,825				13,017				—			—			13,017



-1	Excluded from this table 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 receivable, non-term deposit accounts, and accrued interest payable. The respective carrying values of these instruments would all be considered to be classified within Level 1 of their fair value hierarchy.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 31, 2015
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, 2014 audited consolidated financial statements and notes thereto contained in the 2014 Annual Report on Form 10-K of Enterprise Bancorp, Inc. (the “Company” or “Enterprise”), a Massachusetts corporation, as filed with the Securities and Exchange Commission (the “SEC”) on March 13, 2015. The Company has not changed its reporting policies from those disclosed in its 2014 Annual Report on Form 10-K.

	The Company’s unaudited consolidated interim financial statements include the accounts of the Company and its wholly owned subsidiary, Enterprise Bank and Trust Company (the “Bank”). The Bank is a Massachusetts trust company 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 Investment Services, LLC, organized under the laws of the State of Delaware for the purposes of engaging in insurance sales activities and offering 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 securities investment activities that the Bank itself would be allowed to conduct under applicable laws.

	The Company has 22 full service branches serving the greater Merrimack Valley and North Central regions of Massachusetts and Southern New Hampshire. Through the Bank and its subsidiaries, the Company offers a range of commercial and consumer loan products, and deposit and cash management services. The Company also offers investment advisory and wealth management, trust and insurance 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.

	Pursuant to the Accounting Standards Codification (“ASC”) Topic 810 “Consolidation of Variable Interest Entities,” issued by the Financial Accounting Standards Board (“FASB”), at December 31, 2014, the Company carried Junior Subordinated Debentures as a liability on its consolidated interim financial statements, along with the related interest expense. The debentures were issued by a statutory business trust (the “Trust”) created by the Company in March 2000 under the laws of the State of Delaware, and the trust preferred securities issued by the Trust, and the related non-interest expense, were excluded from the Company’s consolidated interim financial statements. In March 2015, the Company redeemed in full the Junior Subordinated Debentures, which in turned allowed the Trust to redeem in full the trust preferred securities. The Company also dissolved the Trust in April 2015. See Note 5, “Borrowed Funds and Subordinated Debt” below for further information on the Company’s subordinated debt.

	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 have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and the instructions for 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.
Basis of Accounting	Interim results are not necessarily indicative of results to be expected for the entire year.
Reclassification	Certain previous year amounts in the unaudited consolidated financial statements and accompanying footnotes have been reclassified to conform to the current year’s presentation.
Critical Accounting Estimates	Critical Accounting 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 date 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 change over time due to changes in circumstances. Changes in those estimates resulting from continuing change in the economic environment and other factors will be reflected in the financial statements and results of operations in future periods.

	As discussed in the Company’s 2014 Annual Report on Form 10-K, the three most significant areas in which management applies critical assumptions and estimates that are particularly susceptible to change relate to the determination 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 consolidated financial statements included in the Company’s 2014 Annual Report on Form 10-K for significant accounting policies. The Company has not changed its significant accounting policies from those disclosed in its 2014 Annual Report filed on Form 10-K.
Reporting Comprehensive Income	Reporting 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. The Company’s only other comprehensive income component is the net unrealized holding gains or losses on investments available-for-sale, net of deferred income taxes. Pursuant to Accounting Standards Update (“ASU”) No. 2013-02, Comprehensive Income (Topic 220): Reporting Amounts Reclassified Out of Accumulated Other Comprehensive Income, 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 securities are sold. When securities are sold, the reclassification of realized gains and losses on available-for-sale securities are included on the Consolidated Statements of Income under the “non-interest income” subheading on the line item “net gains on sales of investment securities” and the related income tax expense is included in the line item “provision for income taxes,” both of which are also detailed on the Consolidated Statements of Comprehensive Income under the subheading “reclassification adjustment for net gains included in net income.”
Restricted Investments	Restricted Investments

	As a member of the Federal Home Loan Bank of Boston (“FHLB”), the Company is required to purchase certain levels of FHLB capital stock at par value in association with the Company’s borrowing relationship from the FHLB. This stock is classified as a restricted investment and carried at cost, which management believes approximates fair value. FHLB stock represents the only restricted investment held by the Company.

	In conjunction with the other-than-temporary-impairment (“OTTI”) review on available-for-sale investments (See Note 2, “Investments,” for additional information), management also regularly reviews its holdings of FHLB stock for OTTI. Based on management’s periodic review, the Company has not recorded any OTTI charges on this investment to date. If it was determined that a write-down of FHLB stock was required, impairment would be recognized through a charge to earnings.
Income Taxes	Income Taxes

	The Company uses the asset and liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are recognized for the future tax attributable to differences between the financial statement carrying amounts and the tax basis of assets and liabilities. The deferred tax assets and liabilities are reflected at currently enacted income tax rates applicable to the period in which the deferred tax assets or liabilities are expected to be realized or settled. As changes in tax laws or rates are enacted, deferred tax assets and liabilities will be adjusted accordingly through the provision for income taxes.

	The Company’s policy is to classify interest resulting from underpayment of income taxes as income tax expense in the first period the interest would begin accruing according to the provisions of the relevant tax law. The Company classifies penalties resulting from underpayment of income taxes as income tax expense in the period for which the Company claims or expects to claim an uncertain tax position or in the period in which the Company’s judgment changes regarding an uncertain tax position.

	The income tax provisions will differ from the expense that would result from applying the federal statutory rate to income before taxes, primarily due to the impact of tax exempt interest from certain investment securities, loans and bank owned life insurance.

	The Company did not have any unrecognized tax benefits accrued as income tax liabilities or receivables or as deferred tax items at March 31, 2015. The Company is subject to U.S. federal and state income tax examinations by taxing authorities for the 2011 through 2014 tax years.
Recent Accounting Pronouncements	Recent Accounting Pronouncements

	In April 2015, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2015-03, Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. The amendments in this ASU require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this ASU. Entities are required to apply the new guidance on a retrospective basis, wherein the balance sheet of each individual period presented should be adjusted to reflect the period-specific effects of applying the new guidance. For public business entities, the amendments are effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption of the amendments is permitted for financial statements that have not been previously issued. The Company early adopted this ASU as of January 1, 2015 in relation to the Company's Fixed-to-Floating Rate Subordinated Notes issued in January 2015. The adoption did not have a material impact on the Company's financial statements or results of operations.

	In January 2014, the FASB ASU No. 2014-04, Receivables - Troubled Debt Restructurings by Creditors (Subtopic 310-40) - Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. The amendments are intended to reduce diversity of practice by clarifying when a creditor should be considered to have received physical possession of residential real estate property collateralizing a residential mortgage loan, such that the loan should be removed, and the real estate property recognized, on the financial statements. Additionally, the amendments require interim and annual disclosure of both the amount of foreclosed residential real estate property held by the creditor and the recorded investment in collateralized residential mortgage loans that are in the process of foreclosure according to local requirements of the applicable jurisdiction. The amendments in this ASU are effective for public business entities for annual periods and interim reporting periods beginning after December 15, 2014. As this ASU primarily offers clarification of existing standards and added disclosures, the adoption of this ASU in the first quarter of 2015 did not have a material impact on the Company's financial statements or results of operations.

	In January 2014, the FASB issued ASU No. 2014-01, Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects. The amendments in this ASU apply to all reporting entities that invest in qualified affordable housing projects through limited liability entities that are flow through entities for tax purposes. The amendments in this ASU eliminate the effective yield election and permit reporting entities to make an accounting policy election to account for such investments using the proportional amortization method if certain conditions are met. The investor must recognize any subsequent impairment loss when it is more likely than not that the carrying amount of the investment will not be realized. Those not electing the proportional amortization method would account for the investment using the equity method or cost method. The decision to apply the proportional amortization method of accounting is an accounting policy decision that must be applied consistently to all qualifying affordable housing project investments rather than a decision to be applied to individual investments. A reporting entity must disclose information that enables users of its financial statements to understand the nature of such investments and the effect of the measurement, and the related tax credits, on its financial position and results of operations. The amendments in this ASU are to be applied retrospectively to all periods presented. A reporting entity that uses the effective yield method to account for its investments in qualified affordable housing projects before the date of adoption may continue to apply the effective yield method for those preexisting investments. The amendments in this ASU are effective for public business entities for annual periods and interim reporting periods beginning after December 15, 2014. The adoption by the Company of this ASU in the first quarter of 2015 did not have a material impact on the Company's financial statements or results of operations.

	For information regarding recent accounting pronouncements not yet adopted by the Company, see Item 2, “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” under the heading “Recent Accounting Pronouncements.”

Investments_Tables

Investments (Tables)	3 Months Ended
	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Schedule of Available-for-sale Securities Reconciliation	The amortized cost and carrying values of investment securities at the dates specified are summarized as follows:



			March 31, 2015
	(Dollars in thousands)		Amortized			Unrealized				Unrealized				Fair Value
			cost			gains				losses
	Federal agency obligations (1)		$	59,535		$	912			$	—			$	60,447

	Federal agency mortgage backed securities (MBS) (1)		84,914			1,429				303				86,040

	Municipal securities		72,674			1,956				47				74,583

	Corporate bonds		8,068			130				4				8,194

	Total fixed income securities		225,191			4,427				354				229,264

	Equity investments		7,845			2,962				3				10,804

	Total available for sale securities, at fair value		$	233,036		$	7,389			$	357			$	240,068




			December 31, 2014
	(Dollars in thousands)		Amortized			Unrealized				Unrealized				Fair Value
			cost			gains				losses
	Federal agency obligations(1)		$	59,518		$	318			$	24			$	59,812

	Federal agency mortgage backed securities (MBS) (1)		88,303			1,015				516				88,802

	Municipal securities		72,113			2,157				66				74,204

	Corporate bonds		7,937			61				26				7,972

	Total fixed income securities		227,871			3,551				632				230,790

	Equity investments		11,370			3,071				166				14,275

	Total available for sale securities, at fair value		$	239,241		$	6,622			$	798			$	245,065


	__________________________________________

	-1	These categories may include investments issued or guaranteed by government sponsored enterprises such as Fannie Mae (FNMA), Freddie Mac (FHLMC), Ginnie Mae (GNMA), Federal Farm Credit Bank, or one of several Federal Home Loan Banks. All agency MBS/Collateralized Mortgage Obligations (“CMOs”) investments owned by the Company are backed by residential mortgages.
Investments Classified by Contractual Maturity Date	The contractual maturity distribution at March 31, 2015 of total fixed income investments was as follows:



		Within One Year						After One, But Within							After Five, But Within				After Ten Years
								Five Years							Ten Years
		Amortized			Yields			Amortized				Yields			Amortized		Yields		Amortized		Yields
		Cost						Cost							Cost				Cost
	At amortized cost:
	Federal agency obligations	$	—		—	%		$	42,765			1.41	%		$	16,770	2.13	%	$	—	—	%

	MBS	—			—	%		5,178				3.08	%		1,646		1.94	%	78,090		2.16	%

	Municipal securities	3,999			2.96	%		24,625				3.29	%		25,022		3.78	%	19,028		4.06	%

	Corporate bonds	150			0.47	%		4,763				1.64	%		3,155		2.89	%	—		—	%

	Total fixed income securities	$	4,149		2.87	%		$	77,331			2.13	%		$	46,593	3.06	%	$	97,118	2.53	%


	At fair value:
	Total fixed income securities	$	4,195					$	78,792						$	47,808			$	98,469

Loans_Tables

Loans (Tables)	3 Months Ended
	Mar. 31, 2015
Receivables [Abstract]
Schedule of Loans by Loan Classification	Major classifications of loans at the periods indicated were as follows:



	(Dollars in thousands)		March 31,				December 31,
			2015				2014
	Commercial real estate		$	860,765			$	862,747

	Commercial and industrial		413,183				402,994

	Commercial construction		169,264				168,044

	Total commercial loans		1,443,212				1,433,785

	Residential mortgages		148,909				149,959

	Home equity loans and lines		81,852				80,018

	Consumer		9,855				10,708

	Total retail loans		240,616				240,685


	Gross loans		1,683,828				1,674,470

	Deferred loan origination fees, net		(1,708		)		(1,866		)
	Total loans		1,682,120				1,672,604

	Allowance for loan losses		(27,803		)		(27,121		)
	Net loans		$	1,654,317			$	1,645,483

Schedule of Loans Pledged as Collateral	Loans designated as qualified collateral and pledged to the FHLB for borrowing capacity are summarized below:



	(Dollars in thousands)	March 31,				December 31,
		2015				2014
	Commercial real estate	$	265,206			$	276,657

	Residential mortgages	106,054				107,906

	Home equity	15,661				15,677

	Total loans pledged to FHLB	$	386,921			$	400,240

Allowance_For_Loan_Loss_Tables

Allowance For Loan Loss (Tables)	3 Months Ended
	Mar. 31, 2015
Receivables [Abstract]
Financing Receivables by Evaluation Method	The balances of loans as of March 31, 2015 by segment and evaluation method are summarized as follows:


	(Dollars in thousands)		Loans individually				Loans collectively				Total Loans
			evaluated for				evaluated for
			impairment				impairment
	Commercial real estate		$	14,662			$	846,103			$	860,765

	Commercial and industrial		10,968				402,215				413,183

	Commercial construction		2,711				166,553				169,264

	Residential		449				148,460				148,909

	Home equity		179				81,673				81,852

	Consumer		49				9,806				9,855

	Deferred Fees		—				(1,708		)		(1,708		)

	Total loans		$	29,018			$	1,653,102			$	1,682,120


	The balances of loans as of December 31, 2014 by segment and evaluation method are summarized as follows:


	(Dollars in thousands)		Loans individually				Loans collectively				Total Loans
			evaluated for				evaluated for
			impairment				impairment
	Commercial real estate		$	15,003			$	847,744			$	862,747

	Commercial and industrial		10,901				392,093				402,994

	Commercial construction		2,675				165,369				168,044

	Residential		465				149,494				149,959

	Home equity		180				79,838				80,018

	Consumer		28				10,680				10,708

	Deferred Fees		—				(1,866		)		(1,866		)

	Total loans		$	29,252			$	1,643,352			$	1,672,604

Financing Receivable Credit Quality Indicators	The following tables present the Company's credit risk profile for each class of loan in its portfolio by internally assigned risk rating category at the periods indicated.


			March 31, 2015
			Adversely Classified												Not Adversely
	(Dollars in thousands)		Substandard				Doubtful				Loss				Classified			Gross Loans
	Commercial real estate		$	13,114			$	1,173			$	19			$	846,459		$	860,765

	Commercial and industrial		11,268				97				56				401,762			413,183

	Commercial construction		2,794				—				—				166,470			169,264

	Residential		870				—				—				148,039			148,909

	Home equity		453				—				—				81,399			81,852

	Consumer		59				14				—				9,782			9,855

	Total gross loans		$	28,558			$	1,284			$	75			$	1,653,911		$	1,683,828





			December 31, 2014
			Adversely Classified												Not Adversely
	(Dollars in thousands)		Substandard				Doubtful				Loss				Classified			Gross Loans
	Commercial real estate		$	11,409			$	1,188			$	19			$	850,131		$	862,747

	Commercial and industrial		11,298				51				57				391,588			402,994

	Commercial construction		2,759				—				—				165,285			168,044

	Residential		1,133				—				—				148,826			149,959

	Home equity		464				—				—				79,554			80,018

	Consumer		48				—				—				10,660			10,708

	Total gross loans		$	27,111			$	1,239			$	76			$	1,646,044		$	1,674,470

Past Due Financing Receivables	The following tables present age analysis of past due loans as of the dates indicated.


	Balance at March 31, 2015
	(Dollars in thousands)		Loans				Loans				Loans 90 or				Total Past			Current Loans			Gross
			30-59 Days				60-89 Days				More Days				Due Loans						Loans
			Past Due				Past Due				Past Due (non-
											accrual)
	Commercial real estate		$	3,706			$	29			$	10,324			$	14,059		$	846,706		$	860,765

	Commercial and industrial		1,417				—				6,437				7,854			405,329			413,183

	Commercial construction		1,551				—				485				2,036			167,228			169,264

	Residential		671				—				503				1,174			147,735			148,909

	Home equity		256				—				233				489			81,363			81,852

	Consumer		11				8				53				72			9,783			9,855

	Total gross loans		$	7,612			$	37			$	18,035			$	25,684		$	1,658,144		$	1,683,828




	Balance at December 31, 2014
	(Dollars in thousands)		Loans				Loans				Loans 90 or				Total Past			Current Loans			Gross Loans
			30-59 Days				60-89 Days				More Days				Due Loans
			Past Due				Past Due				Past Due (non-
											accrual)
	Commercial real estate		$	1,471			$	1,235			$	9,714			$	12,420		$	850,327		$	862,747

	Commercial and industrial		1,184				101				5,950				7,235			395,759			402,994

	Commercial construction		—				—				447				447			167,597			168,044

	Residential		1,328				370				763				2,461			147,498			149,959

	Home equity		29				—				245				274			79,744			80,018

	Consumer		94				1				17				112			10,596			10,708

	Total gross loans		$	4,106			$	1,707			$	17,136			$	22,949		$	1,651,521		$	1,674,470

Impaired Financing Receivables	The following tables set forth the recorded investment in impaired loans and the related specific allowance allocated as of the dated indicated.


	Balance at March 31, 2015
	(Dollars in thousands)		Unpaid				Total recorded				Recorded				Recorded			Related specific
			contractual				investment in				investment				investment			allowance
			principal balance				impaired loans				with no				with
											allowance				allowance
	Commercial real estate		$	16,927			$	14,662			$	14,464			$	198		$	165

	Commercial and industrial		12,101				10,968				5,635				5,333			1,951

	Commercial construction		2,901				2,711				1,146				1,565			528

	Residential		530				449				449				—			—

	Home equity		181				179				47				132			22

	Consumer		50				49				—				49			49

	Total		$	32,690			$	29,018			$	21,741			$	7,277		$	2,715




	Balance at December 31, 2014
	(Dollars in thousands)		Unpaid				Total recorded				Recorded				Recorded			Related specific
			contractual				investment in				investment				investment			allowance
			principal balance				impaired loans				with no				with
											allowance				allowance
	Commercial real estate		$	17,182			$	15,003			$	14,800			$	203		$	68

	Commercial and industrial		11,991				10,901				5,461				5,440			1,516

	Commercial construction		2,862				2,675				1,150				1,525			519

	Residential		537				465				465				—			—

	Home equity		183				180				—				180			26

	Consumer		28				28				—				28			28

	Total		$	32,783			$	29,252			$	21,876			$	7,376		$	2,157


	The following table presents the average recorded investment in impaired loans and the related interest recognized during the three month periods indicated.



			Three Months Ended March 31, 2015								Three Months Ended March 31, 2014
	(Dollars in thousands)		Average recorded				Interest income				Average recorded				Interest income
			investment				recognized				investment				recognized
	Commercial real estate		$	15,479			$	45			$	14,158			$	50

	Commercial and industrial		11,256				34				10,828				38

	Commercial construction		2,624				26				3,305				26

	Residential		459				—				759				—

	Home equity		179				1				108				—

	Consumer		49				—				24				—

Total		$	30,046			$	106			$	29,182			$	114

Troubled Debt Restructurings on Financing Receivables	Loans modified as troubled debt restructurings during the three month period ended March 31, 2015 are detailed below.



			Three months ended March 31, 2015
	(Dollars in thousands)		Number of			Pre-modification				Post-modification
			restructurings			outstanding recorded				outstanding recorded
						investment				investment
	Commercial real estate		—			$	—			$	—

	Commercial and industrial		4			869				869

	Commercial construction		—			—				—

	Residential		—			—				—

	Home equity		—			—				—

	Consumer		—			—				—

	Total		4			$	869			$	869


	Loans modified as troubled debt restructurings during the three month period ended March 31, 2014 are detailed below.



			Three months ended March 31, 2014
	(Dollars in thousands)		Number of			Pre-modification				Post-modification
			restructurings			outstanding recorded				outstanding recorded
						investment				investment
	Commercial real estate		1			$	453			$	446

	Commercial and industrial		2			70				68

	Commercial construction		—			—				—

	Residential		—			—				—

	Home equity		—			—				—

	Consumer		—			—				—

	Total		3			$	523			$	514


Allowance for Credit Losses on Financing Receivables	Changes in the allowance for loan losses by segment for the three months ended March 31, 2015 are presented below:



	(Dollars in thousands)		Cmml Real				Cmml and				Cmml				Resid.			Home			Consumer			Total
			Estate				Industrial				Constr				Mortgage			Equity
	Beginning Balance at December 31, 2014		$	12,664			$	9,245			$	3,384			$	989		$	608		$	231		$	27,121

	Provision		78				530				11				(29		)	7			28			625

	Recoveries		5				84				13				—			—			8			110

	Less: Charge offs		—				17				—				—			—			36			53

	Ending Balance at March 31, 2015		$	12,747			$	9,842			$	3,408			$	960		$	615		$	231		$	27,803

	Ending allowance balance:
	Allotted to loans individually evaluated for impairment		$	165			$	1,951			$	528			$	—		$	22		$	49		$	2,715

	Allotted to loans collectively evaluated for impairment		$	12,582			$	7,891			$	2,880			$	960		$	593		$	182		$	25,088


	Changes in the allowance for loan losses by segment for the three months ended March 31, 2014 are presented below:


	(Dollars in thousands)		Cmml Real				Cmml and				Cmml				Resid.			Home			Consumer			Total
			Estate				Industrial				Constr				Mortgage			Equity
	Beginning Balance at December 31, 2013		$	13,174			$	8,365			$	3,493			$	1,057		$	653		$	225		$	26,967

	Provision		(101		)		118				96				119			(19		)	(13		)	200

	Recoveries		—				26				—				—			—			12			38

	Less: Charge offs		203				812				—				—			—			18			1,033

	Ending Balance at March 31, 2014		$	12,870			$	7,697			$	3,589			$	1,176		$	634		$	206		$	26,172

	Ending allowance balance:
	Allotted to loans individually evaluated for impairment		$	214			$	2,051			$	847			$	156		$	19		$	21		$	3,308

	Allotted to loans collectively evaluated for impairment		$	12,656			$	5,646			$	2,742			$	1,020		$	615		$	185		$	22,864

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	The table below provides a summary of the options granted in 2015 and 2014.



		Three Months Ended March 31
		2015			2014
	Options granted	27,115			31,229

	Term in years	10			10

	Average assumptions used in the fair value model:
	Expected volatility	47		%	47		%
	Expected dividend yield	2.89		%	2.88		%
	Expected life in years	7			7

	Risk-free interest rate	1.95		%	2.19		%
	Market price on date of grant	$	21.03		$	20.29

	Per share weighted average fair value	$	8.51		$	8.32

	Fair value as a percentage of market value at grant date	40		%	41		%
Schedule of Restricted Stock Awards Granted	The table below provides a summary of restricted stock awards granted in 2015 and 2014.


		Three Months Ended March 31
	Restricted Stock Awards	2015			2014
	Two Year Vesting	7,276			6,660

	Four Year Vesting	17,181			19,167

	Performance-Based Vesting	30,262			33,017

	Total Restricted Stock Awards	54,719			58,844


	Weighted average grant date fair value	$	21.03		$	20.29

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2015
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 March 31,
		2015	2014
	Basic weighted average common shares outstanding	10,243,044	10,030,111

	Dilutive shares	67,430	89,155

	Diluted weighted average common shares outstanding	10,310,474	10,119,266

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2015
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:



			March 31, 2015			Fair Value Measurements using:
	(Dollars in thousands)		Fair Value			(level 1)			(level 2)		(level 3)
	Assets measured on a recurring basis:

	Fixed income securities		$	229,264		$	—		$	229,264	$	—

	Equity securities		10,804			10,804			—		—

	FHLB stock		4,239			—			—		4,239

	Assets measured on a non-recurring basis:

	Impaired loans (collateral dependent)		4,497			—			—		4,497

	Other real estate owned		114			—			—		114




			December 31,			Fair Value Measurements using:
			2014
	(Dollars in thousands)		Fair Value			(level 1)			(level 2)		(level 3)
	Assets measured on a recurring basis:

	Fixed income securities		$	230,790		$	—		$	230,790	$	—

	Equity securities		14,275			14,275			—		—

	FHLB stock		3,357			—			—		3,357

	Assets measured on a non-recurring basis:

	Impaired loans (collateral dependent)		5,174			—			—		5,174

	Other real estate owned		861			—			—		861

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 recurring and 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 March 31, 2015.



	(Dollars in thousands)		Fair Value		Valuation Technique	Unobservable Input		Unobservable Input Value or Range
	Assets measured on a recurring basis:
	FHLB stock		$4,239		FHLB Stated Par Value	N/A		N/A
	Assets measured on a non-recurring basis:
	Impaired loans (collateral dependent)		$4,497		Appraisal of collateral	Appraisal adjustments (1)		5% - 50%
	Other real estate owned		$114		Appraisal of collateral	Appraisal adjustments (1)		0% - 30%

	-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 financial instruments(1) for which fair value is only disclosed but not recognized on the balance sheet at the dates indicated are summarized as follows:



			March 31, 2015						Fair value measurement
	(Dollars in thousands)		Carrying			Fair Value			Level 1 inputs		Level 2 Inputs		Level 3 Inputs
			Amount
	Financial assets:

	Loans held for sale		$	1,125		$	1,129		$	—	$	1,129	$	—

	Loans, net		1,654,317			1,675,818			—		—		1,675,818

	Financial liabilities:

	Certificates of deposit (including brokered)		298,295			297,862			—		297,862		—

	Borrowed funds		900			900			—		900		—

	Subordinated debt		14,810			14,138			—		—		14,138




			December 31, 2014						Fair value measurement
	(Dollars in thousands)		Carrying			Fair Value			Level 1 inputs		Level 2 Inputs		Level 3 Inputs
			Amount
	Financial assets:

	Loans held for sale		$	2,371		$	2,381		$	—	$	2,381	$	—

	Loans, net		1,645,483			1,668,863			—		—		1,668,863

	Financial liabilities:

	Certificates of deposit (including brokered)		263,779			262,774			—		262,774		—

	Borrowed funds		58,900			58,899			—		58,899		—

	Subordinated debt		10,825			13,017			—		—		13,017



	-1	Excluded from this table 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 receivable, non-term deposit accounts, and accrued interest payable. The respective carrying values of these instruments would all be considered to be classified within Level 1 of their fair value hierarchy.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Details)	3 Months Ended
	Mar. 31, 2015
	segment
	branches
Accounting Policies [Abstract]
Number of branches	22
Reportable operating segments	1

Investments_Availableforsale_D

Investments Available-for-sale (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
Available-for-sale Securities, Gross Unrealized Gain (Loss) [Abstract]
Fair Value	$240,068,000		$245,065,000
Securities pledged as collateral	229,300,000
Total fixed income securities
Available-for-sale Securities, Gross Unrealized Gain (Loss) [Abstract]
Amortized cost	225,191,000		227,871,000
Unrealized gains	4,427,000		3,551,000
Unrealized losses	354,000		632,000
Fair Value	229,264,000		230,790,000
Federal Agency Obligations
Available-for-sale Securities, Gross Unrealized Gain (Loss) [Abstract]
Amortized cost	59,535,000	[1]	59,518,000	[1]
Unrealized gains	912,000	[1]	318,000	[1]
Unrealized losses	0	[1]	24,000	[1]
Fair Value	60,447,000	[1]	59,812,000	[1]
Federal Agency mortgage backed securities (MBS)
Available-for-sale Securities, Gross Unrealized Gain (Loss) [Abstract]
Amortized cost	84,914,000	[1]	88,303,000	[1]
Unrealized gains	1,429,000	[1]	1,015,000	[1]
Unrealized losses	303,000	[1]	516,000	[1]
Fair Value	86,040,000	[1]	88,802,000	[1]
Collateralized Mortgage Obligations (CMOs)
Available-for-sale Securities, Gross Unrealized Gain (Loss) [Abstract]
Fair Value	12,500,000		13,300,000
Municipal securities
Available-for-sale Securities, Gross Unrealized Gain (Loss) [Abstract]
Amortized cost	72,674,000		72,113,000
Unrealized gains	1,956,000		2,157,000
Unrealized losses	47,000		66,000
Fair Value	74,583,000		74,204,000
Corporate bonds
Available-for-sale Securities, Gross Unrealized Gain (Loss) [Abstract]
Amortized cost	8,068,000		7,937,000
Unrealized gains	130,000		61,000
Unrealized losses	4,000		26,000
Fair Value	8,194,000		7,972,000
Equity investments
Available-for-sale Securities, Gross Unrealized Gain (Loss) [Abstract]
Amortized cost	7,845,000		11,370,000
Unrealized gains	2,962,000		3,071,000
Unrealized losses	3,000		166,000
Fair Value	10,804,000		14,275,000
Percent of portfolio invested in financial services	16.00%
Total available for sale securities, at fair value
Available-for-sale Securities, Gross Unrealized Gain (Loss) [Abstract]
Amortized cost	233,036,000		239,241,000
Unrealized gains	7,389,000		6,622,000
Unrealized losses	357,000		798,000
Fair Value	240,068,000		245,065,000
Number of securities in loss position	26
Investments Temporarily Impaired, Fair Value	25,900,000
Investments Temporarily Impaired,12 months or longer, Unrealized Losses	$310,000

[1]	These categories may include investments issued or guaranteed by government sponsored enterprises such as Fannie Mae (FNMA), Freddie Mac (FHLMC), Ginnie Mae (GNMA), Federal Farm Credit Bank, or one of several Federal Home Loan Banks. All agency MBS/Collateralized Mortgage Obligations (bCMOsb) investments owned by the Company are backed by residential mortgages.

Investments_Maturities_Details

Investments Maturities (Details) (USD $)	Mar. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Callable Securities, Fair Value	$39,100,000
Total fixed income securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Within One Year	4,149,000
Amortized Cost, Within One Year, Yield	2.87%
Fair Value, Within One Year	4,195,000
Amortized Cost Basis, After One, But Within Five Years	77,331,000
Amortized Cost Basis, After One, But Within Five Years, Yield	2.13%
Fair Value, After One, But Within Five Years	78,792,000
Amortized Cost, After Five, But Within Ten Years	46,593,000
Amortized Cost, After Five, But Within Ten Years, Yield	3.06%
Fair Value, after Five but Within Ten Years	47,808,000
Amortized Cost Basis, After Ten Years	97,118,000
Amortized Cost after Ten Years, Yield	2.53%
Fair Value, After Ten Years	98,469,000
Federal agency obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Within One Year	0
Amortized Cost, Within One Year, Yield	0.00%
Amortized Cost Basis, After One, But Within Five Years	42,765,000
Amortized Cost Basis, After One, But Within Five Years, Yield	1.41%
Amortized Cost, After Five, But Within Ten Years	16,770,000
Amortized Cost, After Five, But Within Ten Years, Yield	2.13%
Amortized Cost Basis, After Ten Years	0
Amortized Cost after Ten Years, Yield	0.00%
MBS
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Within One Year	0
Amortized Cost, Within One Year, Yield	0.00%
Amortized Cost Basis, After One, But Within Five Years	5,178,000
Amortized Cost Basis, After One, But Within Five Years, Yield	3.08%
Amortized Cost, After Five, But Within Ten Years	1,646,000
Amortized Cost, After Five, But Within Ten Years, Yield	1.94%
Amortized Cost Basis, After Ten Years	78,090,000
Amortized Cost after Ten Years, Yield	2.16%
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Within One Year	3,999,000
Amortized Cost, Within One Year, Yield	2.96%
Amortized Cost Basis, After One, But Within Five Years	24,625,000
Amortized Cost Basis, After One, But Within Five Years, Yield	3.29%
Amortized Cost, After Five, But Within Ten Years	25,022,000
Amortized Cost, After Five, But Within Ten Years, Yield	3.78%
Amortized Cost Basis, After Ten Years	19,028,000
Amortized Cost after Ten Years, Yield	4.06%
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Within One Year	150,000
Amortized Cost, Within One Year, Yield	0.47%
Amortized Cost Basis, After One, But Within Five Years	4,763,000
Amortized Cost Basis, After One, But Within Five Years, Yield	1.64%
Amortized Cost, After Five, But Within Ten Years	3,155,000
Amortized Cost, After Five, But Within Ten Years, Yield	2.89%
Amortized Cost Basis, After Ten Years	$0
Amortized Cost after Ten Years, Yield	0.00%

Loans_Balance_by_Class_of_Loan

Loans - Balance by Class of Loans (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Schedule of Loans by Loan Classification [Line Items]
Gross loans	$1,683,828	$1,674,470
Deferred loan origination fees, net	-1,708	-1,866
Total loans	1,682,120	1,672,604
Allowance for loan losses	-27,803	-27,121	-26,172	-26,967
Net Loans	1,654,317	1,645,483
Commercial
Schedule of Loans by Loan Classification [Line Items]
Gross loans	1,443,212	1,433,785
Commercial real estate
Schedule of Loans by Loan Classification [Line Items]
Gross loans	860,765	862,747
Allowance for loan losses	-12,747	-12,664	-12,870	-13,174
Commercial and industrial
Schedule of Loans by Loan Classification [Line Items]
Gross loans	413,183	402,994
Allowance for loan losses	-9,842	-9,245	-7,697	-8,365
Commercial construction
Schedule of Loans by Loan Classification [Line Items]
Gross loans	169,264	168,044
Allowance for loan losses	-3,408	-3,384	-3,589	-3,493
Retail
Schedule of Loans by Loan Classification [Line Items]
Gross loans	240,616	240,685
Residential
Schedule of Loans by Loan Classification [Line Items]
Gross loans	148,909	149,959
Allowance for loan losses	-960	-989	-1,176	-1,057
Home Equity
Schedule of Loans by Loan Classification [Line Items]
Gross loans	81,852	80,018
Allowance for loan losses	-615	-608	-634	-653
Consumer
Schedule of Loans by Loan Classification [Line Items]
Gross loans	9,855	10,708
Allowance for loan losses	($231)	($231)	($206)	($225)

Loans_Loan_Categories_Narrativ

Loans - Loan Categories Narrative (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
	payment	Dec. 31, 2014
Commercial real estate \| Minimum
Schedule of Loans by Loan Classification [Line Items]
Repayment period, term of loan	15 years
Commercial real estate \| Maximum
Schedule of Loans by Loan Classification [Line Items]
Repayment period, term of loan	25 years
Commercial and industrial \| Minimum
Schedule of Loans by Loan Classification [Line Items]
Repayment period, term of loan	1 year
Commercial and industrial \| Maximum
Schedule of Loans by Loan Classification [Line Items]
Repayment period, term of loan	7 years
Commercial construction \| Minimum
Schedule of Loans by Loan Classification [Line Items]
Repayment period, term of loan	1 year
Commercial construction \| Maximum
Schedule of Loans by Loan Classification [Line Items]
Repayment period, term of loan	3 years
Commercial
Schedule of Loans by Loan Classification [Line Items]
Participation loans amount	$63.50	$65.30
Participations loans sold that are still serviced amount	46.4	44.8
Residential
Schedule of Loans by Loan Classification [Line Items]
Early Payment Default Period	4
Amount of loans serviced for others	$19.20	$19.30
Residential \| Maximum
Schedule of Loans by Loan Classification [Line Items]
Repayment period, term of loan	30 years
Home Equity \| Maximum
Schedule of Loans by Loan Classification [Line Items]
Loan-to-value ratio	80.00%
Home equity lines of credit
Schedule of Loans by Loan Classification [Line Items]
Term of interest only payments	10 years
Term of Principal and Interest Payments after Interest only term	15 years
Home Equity Loans \| Minimum
Schedule of Loans by Loan Classification [Line Items]
Repayment period, term of loan	3 years
Period a loan has a fixed rate	3 years
Home Equity Loans \| Maximum
Schedule of Loans by Loan Classification [Line Items]
Repayment period, term of loan	15 years
Period a loan has a fixed rate	15 years
Multi-family owner occupied residential property \| Minimum
Schedule of Loans by Loan Classification [Line Items]
Loan-to-value ratio	75.00%
Single family owner occupied residential property \| Maximum
Schedule of Loans by Loan Classification [Line Items]
Loan-to-value ratio	97.00%

Loans_Loans_Serving_as_Collate

Loans - Loans Serving as Collateral (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans pledged to the FHLB for borrowing capacity	$386,921	$400,240
Commercial Real Estate
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans pledged to the FHLB for borrowing capacity	265,206	276,657
Residential
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans pledged to the FHLB for borrowing capacity	106,054	107,906
Home Equity
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans pledged to the FHLB for borrowing capacity	$15,661	$15,677

Allowance_For_Loan_Loss_Evalua

Allowance For Loan Loss - Evaluation Method (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Financing Receivable by Evaluation Method [Line Items]
Loans individually evaluated for impairment	$29,018	$29,252
Loans collectively evaluated for impairment	1,653,102	1,643,352
Gross loans	1,683,828	1,674,470
Deferred loan origination fees, net	-1,708	-1,866
Total loans	1,682,120	1,672,604
Commercial real estate
Schedule of Financing Receivable by Evaluation Method [Line Items]
Loans individually evaluated for impairment	14,662	15,003
Loans collectively evaluated for impairment	846,103	847,744
Gross loans	860,765	862,747
Commercial and industrial
Schedule of Financing Receivable by Evaluation Method [Line Items]
Loans individually evaluated for impairment	10,968	10,901
Loans collectively evaluated for impairment	402,215	392,093
Gross loans	413,183	402,994
Commercial construction
Schedule of Financing Receivable by Evaluation Method [Line Items]
Loans individually evaluated for impairment	2,711	2,675
Loans collectively evaluated for impairment	166,553	165,369
Gross loans	169,264	168,044
Residential
Schedule of Financing Receivable by Evaluation Method [Line Items]
Loans individually evaluated for impairment	449	465
Loans collectively evaluated for impairment	148,460	149,494
Gross loans	148,909	149,959
Home Equity
Schedule of Financing Receivable by Evaluation Method [Line Items]
Loans individually evaluated for impairment	179	180
Loans collectively evaluated for impairment	81,673	79,838
Gross loans	81,852	80,018
Consumer
Schedule of Financing Receivable by Evaluation Method [Line Items]
Loans individually evaluated for impairment	49	28
Loans collectively evaluated for impairment	9,806	10,680
Gross loans	$9,855	$10,708

Allowance_For_Loan_Loss_Advers

Allowance For Loan Loss - Adversely Classified Loans (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Adversely classified loans to total loans	1.78%	1.70%
Gross loans	$1,683,828	$1,674,470
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Gross loans	860,765	862,747
Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Gross loans	413,183	402,994
Commercial construction
Financing Receivable, Recorded Investment [Line Items]
Gross loans	169,264	168,044
Residential
Financing Receivable, Recorded Investment [Line Items]
Gross loans	148,909	149,959
Home Equity
Financing Receivable, Recorded Investment [Line Items]
Gross loans	81,852	80,018
Consumer
Financing Receivable, Recorded Investment [Line Items]
Gross loans	9,855	10,708
Substandard
Financing Receivable, Recorded Investment [Line Items]
Gross loans	28,558	27,111
Substandard \| Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Gross loans	13,114	11,409
Substandard \| Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Gross loans	11,268	11,298
Substandard \| Commercial construction
Financing Receivable, Recorded Investment [Line Items]
Gross loans	2,794	2,759
Substandard \| Residential
Financing Receivable, Recorded Investment [Line Items]
Gross loans	870	1,133
Substandard \| Home Equity
Financing Receivable, Recorded Investment [Line Items]
Gross loans	453	464
Substandard \| Consumer
Financing Receivable, Recorded Investment [Line Items]
Gross loans	59	48
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Gross loans	1,284	1,239
Doubtful \| Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Gross loans	1,173	1,188
Doubtful \| Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Gross loans	97	51
Doubtful \| Commercial construction
Financing Receivable, Recorded Investment [Line Items]
Gross loans	0	0
Doubtful \| Residential
Financing Receivable, Recorded Investment [Line Items]
Gross loans	0	0
Doubtful \| Home Equity
Financing Receivable, Recorded Investment [Line Items]
Gross loans	0	0
Doubtful \| Consumer
Financing Receivable, Recorded Investment [Line Items]
Gross loans	14	0
Loss
Financing Receivable, Recorded Investment [Line Items]
Gross loans	75	76
Loss \| Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Gross loans	19	19
Loss \| Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Gross loans	56	57
Loss \| Commercial construction
Financing Receivable, Recorded Investment [Line Items]
Gross loans	0	0
Loss \| Residential
Financing Receivable, Recorded Investment [Line Items]
Gross loans	0	0
Loss \| Home Equity
Financing Receivable, Recorded Investment [Line Items]
Gross loans	0	0
Loss \| Consumer
Financing Receivable, Recorded Investment [Line Items]
Gross loans	0	0
Not Adversely Classified
Financing Receivable, Recorded Investment [Line Items]
Gross loans	1,653,911	1,646,044
Not Adversely Classified \| Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Gross loans	846,459	850,131
Not Adversely Classified \| Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Gross loans	401,762	391,588
Not Adversely Classified \| Commercial construction
Financing Receivable, Recorded Investment [Line Items]
Gross loans	166,470	165,285
Not Adversely Classified \| Residential
Financing Receivable, Recorded Investment [Line Items]
Gross loans	148,039	148,826
Not Adversely Classified \| Home Equity
Financing Receivable, Recorded Investment [Line Items]
Gross loans	81,399	79,554
Not Adversely Classified \| Consumer
Financing Receivable, Recorded Investment [Line Items]
Gross loans	$9,782	$10,660

Allowance_For_Loan_Loss_Past_D

Allowance For Loan Loss - Past Due and Non-Accrual Loans (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Schedule of Aging of Financing Receivables [Line Items]
Number of days a loan must be paid current before accrual of interest is resumed	180 days
Loans 30-59 Days Past Due	$7,612	$4,106
Loans 60-89 Days Past Due	37	1,707
Non-accrual loans	18,035	17,136
Total Past Due Loans	25,684	22,949
Current Loans	1,658,144	1,651,521
Gross loans	1,683,828	1,674,470
The ratio of non-accrual loans to total loans	1.07%	1.02%	1.10%
Additional funding commitments for loans on non-accrual	240
Commercial real estate
Schedule of Aging of Financing Receivables [Line Items]
Loans 30-59 Days Past Due	3,706	1,471
Loans 60-89 Days Past Due	29	1,235
Non-accrual loans	10,324	9,714
Total Past Due Loans	14,059	12,420
Current Loans	846,706	850,327
Gross loans	860,765	862,747
Increase (decrease) in non-accrual loans	610
Commercial and industrial
Schedule of Aging of Financing Receivables [Line Items]
Loans 30-59 Days Past Due	1,417	1,184
Loans 60-89 Days Past Due	0	101
Non-accrual loans	6,437	5,950
Total Past Due Loans	7,854	7,235
Current Loans	405,329	395,759
Gross loans	413,183	402,994
Increase (decrease) in non-accrual loans	487
Commercial construction
Schedule of Aging of Financing Receivables [Line Items]
Loans 30-59 Days Past Due	1,551	0
Loans 60-89 Days Past Due	0	0
Non-accrual loans	485	447
Total Past Due Loans	2,036	447
Current Loans	167,228	167,597
Gross loans	169,264	168,044
Residential
Schedule of Aging of Financing Receivables [Line Items]
Loans 30-59 Days Past Due	671	1,328
Loans 60-89 Days Past Due	0	370
Non-accrual loans	503	763
Total Past Due Loans	1,174	2,461
Current Loans	147,735	147,498
Gross loans	148,909	149,959
Home Equity
Schedule of Aging of Financing Receivables [Line Items]
Loans 30-59 Days Past Due	256	29
Loans 60-89 Days Past Due	0	0
Non-accrual loans	233	245
Total Past Due Loans	489	274
Current Loans	81,363	79,744
Gross loans	81,852	80,018
Consumer
Schedule of Aging of Financing Receivables [Line Items]
Loans 30-59 Days Past Due	11	94
Loans 60-89 Days Past Due	8	1
Non-accrual loans	53	17
Total Past Due Loans	72	112
Current Loans	9,783	10,596
Gross loans	9,855	10,708
Deposit liabilities reclassified as loans receivable, 90 days or more past due	11	1
Not Adversely Classified
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	1,653,911	1,646,044
Non-accrual loans not adversely classified	227	211
Not Adversely Classified \| Commercial real estate
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	846,459	850,131
Not Adversely Classified \| Commercial and industrial
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	401,762	391,588
Not Adversely Classified \| Commercial construction
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	166,470	165,285
Not Adversely Classified \| Residential
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	148,039	148,826
Not Adversely Classified \| Home Equity
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	81,399	79,554
Not Adversely Classified \| Consumer
Schedule of Aging of Financing Receivables [Line Items]
Gross loans	$9,782	$10,660

Allowance_For_Loan_Loss_Impair

Allowance For Loan Loss - Impaired Loans (Details) (USD $)	3 Months Ended
Allowance For Loan Loss - Impaired Loans (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Total recorded investment in impaired loans	$29,018,000		$29,252,000
Total accruing impaired loans	11,200,000		12,500,000
Impaired non-accrual loans	17,800,000		16,700,000
Unpaid contractual principal balance	32,690,000		32,783,000
Recorded investment with no allowance	21,741,000		21,876,000
Recorded investment with allowance	7,277,000		7,376,000
Related allowance	2,715,000		2,157,000
Average recorded investment	30,046,000	29,182,000
Interest income recognized	106,000	114,000
Additional funding commitments on impaired loans	285,000
Commercial real estate
Financing Receivable, Impaired [Line Items]
Total recorded investment in impaired loans	14,662,000		15,003,000
Unpaid contractual principal balance	16,927,000		17,182,000
Recorded investment with no allowance	14,464,000		14,800,000
Recorded investment with allowance	198,000		203,000
Related allowance	165,000		68,000
Average recorded investment	15,479,000	14,158,000
Interest income recognized	45,000	50,000
Commercial and industrial
Financing Receivable, Impaired [Line Items]
Total recorded investment in impaired loans	10,968,000		10,901,000
Unpaid contractual principal balance	12,101,000		11,991,000
Recorded investment with no allowance	5,635,000		5,461,000
Recorded investment with allowance	5,333,000		5,440,000
Related allowance	1,951,000		1,516,000
Average recorded investment	11,256,000	10,828,000
Interest income recognized	34,000	38,000
Commercial construction
Financing Receivable, Impaired [Line Items]
Total recorded investment in impaired loans	2,711,000		2,675,000
Unpaid contractual principal balance	2,901,000		2,862,000
Recorded investment with no allowance	1,146,000		1,150,000
Recorded investment with allowance	1,565,000		1,525,000
Related allowance	528,000		519,000
Average recorded investment	2,624,000	3,305,000
Interest income recognized	26,000	26,000
Residential
Financing Receivable, Impaired [Line Items]
Total recorded investment in impaired loans	449,000		465,000
Unpaid contractual principal balance	530,000		537,000
Recorded investment with no allowance	449,000		465,000
Recorded investment with allowance	0		0
Related allowance	0		0
Average recorded investment	459,000	759,000
Interest income recognized	0	0
Home Equity
Financing Receivable, Impaired [Line Items]
Total recorded investment in impaired loans	179,000		180,000
Unpaid contractual principal balance	181,000		183,000
Recorded investment with no allowance	47,000		0
Recorded investment with allowance	132,000		180,000
Related allowance	22,000		26,000
Average recorded investment	179,000	108,000
Interest income recognized	1,000	0
Consumer
Financing Receivable, Impaired [Line Items]
Total recorded investment in impaired loans	49,000		28,000
Unpaid contractual principal balance	50,000		28,000
Recorded investment with no allowance	0		0
Recorded investment with allowance	49,000		28,000
Related allowance	49,000		28,000
Average recorded investment	49,000	24,000
Interest income recognized	$0	$0

Allowance_For_Loan_Loss_Troubl

Allowance For Loan Loss - Troubled Debt Restructures (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
	restructuring	restructuring	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Total Troubled Debt Restructure (TDR) loans	$18,700,000		$19,500,000
TDR loans on accrual status	10,600,000		11,900,000
TDR loans included in non-performing loans	8,000,000		7,500,000
Additional Funding Commitments on TDR loans	54,000
Number of restructurings	4	3
Pre-modification outstanding recorded investment	869,000	523,000
Post-modification outstanding recorded investment	869,000	514,000
Specific reserves allocated to TDRs	61,000	0
Interest payments received on nonaccruing TDR loans excluded from income	1,000	8,000
Charge-offs associated with TDRs	0	0
Number of TDRs that defaulted		0
Commercial real estate
Financing Receivable, Modifications [Line Items]
Number of restructurings	0	1
Pre-modification outstanding recorded investment	0	453,000
Post-modification outstanding recorded investment	0	446,000
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of restructurings	4	2
Pre-modification outstanding recorded investment	869,000	70,000
Post-modification outstanding recorded investment	869,000	68,000
Commercial construction
Financing Receivable, Modifications [Line Items]
Number of restructurings	0	0
Pre-modification outstanding recorded investment	0	0
Post-modification outstanding recorded investment	0	0
Residential
Financing Receivable, Modifications [Line Items]
Number of restructurings	0	0
Pre-modification outstanding recorded investment	0	0
Post-modification outstanding recorded investment	0	0
Home Equity
Financing Receivable, Modifications [Line Items]
Number of restructurings	0	0
Pre-modification outstanding recorded investment	0	0
Post-modification outstanding recorded investment	0	0
Consumer
Financing Receivable, Modifications [Line Items]
Number of restructurings	0	0
Pre-modification outstanding recorded investment	0	0
Post-modification outstanding recorded investment	$0	$0

Allowance_For_Loan_Loss_Other_

Allowance For Loan Loss - Other Real Estate Owned (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
	property	property	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carry value of OREO	$114		$861
Number of OREO properties sold	2	0
Net gains on sales of OREO	154	0
Other real estate owned
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of OREO properties owned	1		3
Number of OREO properties added	0
OREO fair value adjustment	$0	$0

Allowance_For_Loan_Loss_Allowa

Allowance For Loan Loss - Allowance for Loan Losses (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses to total loans ratio	1.65%	1.69%	1.62%
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$27,121	$26,967
Provision for loan losses	625	200
Recoveries	110	38
Less: Charge offs	53	1,033
Ending Balance	27,803	26,172
Allotted to loans individually evaluated for impairment	2,715	3,308
Allotted to loans collectively evaluated for impairment	25,088	22,864
Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	12,664	13,174
Provision for loan losses	78	-101
Recoveries	5	0
Less: Charge offs	0	203
Ending Balance	12,747	12,870
Allotted to loans individually evaluated for impairment	165	214
Allotted to loans collectively evaluated for impairment	12,582	12,656
Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	9,245	8,365
Provision for loan losses	530	118
Recoveries	84	26
Less: Charge offs	17	812
Ending Balance	9,842	7,697
Allotted to loans individually evaluated for impairment	1,951	2,051
Allotted to loans collectively evaluated for impairment	7,891	5,646
Commercial construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	3,384	3,493
Provision for loan losses	11	96
Recoveries	13	0
Less: Charge offs	0	0
Ending Balance	3,408	3,589
Allotted to loans individually evaluated for impairment	528	847
Allotted to loans collectively evaluated for impairment	2,880	2,742
Residential
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	989	1,057
Provision for loan losses	-29	119
Recoveries	0	0
Less: Charge offs	0	0
Ending Balance	960	1,176
Allotted to loans individually evaluated for impairment	0	156
Allotted to loans collectively evaluated for impairment	960	1,020
Home Equity
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	608	653
Provision for loan losses	7	-19
Recoveries	0	0
Less: Charge offs	0	0
Ending Balance	615	634
Allotted to loans individually evaluated for impairment	22	19
Allotted to loans collectively evaluated for impairment	593	615
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	231	225
Provision for loan losses	28	-13
Recoveries	8	12
Less: Charge offs	36	18
Ending Balance	231	206
Allotted to loans individually evaluated for impairment	49	21
Allotted to loans collectively evaluated for impairment	$182	$185

Borrowed_Funds_and_Subordinate1

Borrowed Funds and Subordinated Debt (Details) (USD $)	1 Months Ended	3 Months Ended	60 Months Ended
Borrowed Funds and Subordinated Debt (Details) (USD $)	Mar. 31, 2000	Mar. 31, 2015	Jan. 30, 2030	Dec. 31, 2014	Jan. 31, 2015
Debt Instrument [Line Items]
Borrowed funds		$900,000		$58,900,000
Subordinated debt		14,810,000		10,825,000
Debt issuance costs		190,000
Proceeds from capital contributions	325,000
Junior subordinated debt, amount	10,825,000
Federal Home Loan Bank Borrowings
Debt Instrument [Line Items]
Borrowed funds		900,000		58,900,000
Fixed-to Floating Rate Subordinated Notes
Debt Instrument [Line Items]
Subordinated debt					15,000,000
Subordinated debt, rate		6.00%
Junior Subordinated Debt
Debt Instrument [Line Items]
Subordinated debt, rate	10.88%
Scenario, Forecast \| Fixed-to Floating Rate Subordinated Notes
Debt Instrument [Line Items]
Spread over LIBOR fixed-to floating rate note, rate			3.90%
Enterprise (MA) Capital Trust 1
Debt Instrument [Line Items]
Trust preferred securities, value	$10,500,000
Trust preferred securities, stated interest rate	10.88%

Supplemental_Retirement_Plan_a1

Supplemental Retirement Plan and Other Postretirement Benefit Obligations (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
	officer	Mar. 31, 2014
Supplemental Retirement Plan
Defined Benefit Plan Disclosures [Line Items]
Defined Benefit Plan, Number of Active Executive Officers under Plan	2
Defined Benefit Plan, Number of Former Executive Officers under Plan	1
Term of SERP benefits	20 years
Net Periodic Benefit Cost, Interest Only	$31	$36
Benefits Paid	69	69
Remaining accrual for benefit obligation in current year	94
Supplemental Life Insurance Plan
Defined Benefit Plan Disclosures [Line Items]
Net Periodic Benefit Cost, Interest Only	$18	$18

StockBased_Compensation_Summar

Stock-Based Compensation Summary Information for Options Granted (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option awards granted	27,115	31,229
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term in years	10 years	10 years
Expected volatility	47.00%	47.00%
Market price on date of grant	21.03	20.29
Per share weighted average fair value	8.51	8.32
Weighted Average \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	2.89%	2.88%
Expected life in years	7 years	7 years
Risk-free interest rate	1.95%	2.19%
Fair Value as a percentage of market value at grant date	40.00%	41.00%

StockBased_Compensation_Stock_

Stock-Based Compensation Stock Options, Stock Awards, and Stock in Lieu of Directors' Fees (Details) (USD $)	1 Months Ended	3 Months Ended		1 Months Ended	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Jan. 31, 2015	Mar. 31, 2015	Mar. 31, 2014	Jan. 31, 2014	Dec. 31, 2014	Jan. 02, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$488	$481
Number of shares issued in lieu of cash to directors	11,612
Fair market share price						$20.84
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		97	104
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards in period		54,719	58,844
Weighted Average Grant Date Fair Value, Stock Awards		$21.03	$20.29
Restricted stock \| Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		4 years
Restricted stock \| 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		309	308
Common stock \| Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards in period		0		2,142
Weighted Average Grant Date Fair Value, Stock Awards				$20.95
Common stock in lieu of cash \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$82	$69		$242
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%

StockBased_Compensation_Restri

Stock-Based Compensation Restricted Stock Grants (Details) (Restricted stock, USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards in period	54,719	58,844
Weighted Average Grant Date Fair Value, Stock Awards	$21.03	$20.29
Director \| Two year vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards in period	7,276	6,660
Employee \| Four year vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards in period	17,181	19,167
Employee \| Performance-based vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards in period	30,262	33,017

Earnings_Per_Share_Earnings_Pe

Earnings Per Share Earnings Per Share (Details)	3 Months Ended
Earnings Per Share Earnings Per Share (Details)	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Basic weighted average common shares outstanding	10,243,044	10,030,111
Dilutive shares	67,430	89,155
Diluted weighted average common shares outstanding	10,310,474	10,119,266
Stock options
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings per share	0

Fair_Value_Measurements_Recurr

Fair Value Measurements - Recurring and Nonrecurring Basis (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
	property	property	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Specific allowance for collateral dependent impaired loans	$2,000,000		$1,700,000
Number of OREO properties sold	2	0
Net gains on sales of OREO	154,000	0
Other real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
OREO fair value adjustment	0	0
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 1 \| Fixed income 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	10,804,000		14,275,000
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 2 \| Fixed income securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	229,264,000		230,790,000
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	0		0
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 3 \| Fixed income 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	4,239,000		3,357,000
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
Other real estate owned, 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
Other real estate owned, 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	4,497,000		5,174,000
Other real estate owned, Fair Value	114,000		861,000
Fair Value \| Fair Value, Measurements, Recurring \| Fixed income securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	229,264,000		230,790,000
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	10,804,000		14,275,000
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	4,239,000		3,357,000
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	4,497,000		5,174,000
Other real estate owned, Fair Value	$114,000		$861,000

Fair_Value_Measurements_Quanti

Fair Value Measurements - Quantitative (Details) (Fair Value, Inputs, Level 3, USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Fair Value, Measurements, Recurring \| FHLB Stock
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value of assets	4,239		$3,357
Fair Value, Measurements, Recurring \| FHLB Stock \| FHLB par stated value
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value of assets	4,239
Fair Value, Measurements, Nonrecurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans (collateral dependent), Fair Value	4,497		5,174
Other real estate owned, Fair Value	114		861
Fair Value, Measurements, Nonrecurring \| Impaired loans (collateral dependent) \| Appraisal of collateral
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans (collateral dependent), Fair Value	4,497	[1]
Fair Value, Measurements, Nonrecurring \| Impaired loans (collateral dependent) \| Appraisal of collateral \| Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input Value or Range	5.00%
Fair Value, Measurements, Nonrecurring \| Impaired loans (collateral dependent) \| Appraisal of collateral \| Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input Value or Range	50.00%
Fair Value, Measurements, Nonrecurring \| Other real estate owned \| Appraisal of collateral
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other real estate owned, Fair Value	114	[1]
Fair Value, Measurements, Nonrecurring \| Other real estate owned \| Appraisal of collateral \| Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input Value or Range	0.00%
Fair Value, Measurements, Nonrecurring \| Other real estate owned \| Appraisal of collateral \| Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input Value or Range	30.00%

[1]	Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses.

Fair_Value_Measurements_Other_

Fair Value Measurements - Other Guarantees and Commitments (Details) (Financial Standby Letter of Credit)	3 Months Ended
	Mar. 31, 2015
Financial Standby Letter of Credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortization period of estimated fair value on standby letters of credit	1 year

Fair_Value_Measurements_Balanc

Fair Value Measurements - Balance Sheet Grouping (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Carrying Amount
Financial assets:
Loans held for sale	$1,125	[1]	$2,371	[1]
Loans, net	1,654,317	[1]	1,645,483	[1]
Financial liabilities:
Borrowed funds	900	[1]	58,900	[1]
Subordinated debt	14,810	[1]	10,825	[1]
Carrying Amount \| Certificates of deposit
Financial liabilities:
Certificates of deposit	298,295	[1]	263,779	[1]
Fair Value
Financial assets:
Loans held for sale	1,129	[1]	2,381	[1]
Loans, net	1,675,818	[1]	1,668,863	[1]
Financial liabilities:
Borrowed funds	900	[1]	58,899	[1]
Subordinated debt	14,138	[1]	13,017	[1]
Fair Value \| Certificates of deposit
Financial liabilities:
Certificates of deposit	297,862	[1]	262,774	[1]
Fair Value, Inputs, Level 1
Financial assets:
Loans held for sale	0	[1]	0	[1]
Loans, net	0	[1]	0	[1]
Financial liabilities:
Borrowed funds	0	[1]	0	[1]
Subordinated debt	0	[1]	0	[1]
Fair Value, Inputs, Level 1 \| Certificates of deposit
Financial liabilities:
Certificates of deposit	0	[1]	0	[1]
Fair Value, Inputs, Level 2
Financial assets:
Loans held for sale	1,129	[1]	2,381	[1]
Loans, net	0	[1]	0	[1]
Financial liabilities:
Borrowed funds	900	[1]	58,899	[1]
Subordinated debt	0	[1]	0	[1]
Fair Value, Inputs, Level 2 \| Certificates of deposit
Financial liabilities:
Certificates of deposit	297,862	[1]	262,774	[1]
Fair Value, Inputs, Level 3
Financial assets:
Loans held for sale	0	[1]	0	[1]
Loans, net	1,675,818	[1]	1,668,863	[1]
Financial liabilities:
Borrowed funds	0	[1]	0	[1]
Subordinated debt	14,138	[1]	13,017	[1]
Fair Value, Inputs, Level 3 \| Certificates of deposit
Financial liabilities:
Certificates of deposit	$0	[1]	$0	[1]

[1]	Excluded from this table 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 receivable, non-term deposit accounts, and accrued interest payable. The respective carrying values of these instruments would all be considered to be classified within Level 1 of their fair value hierarchy.