Meridian Bancorp (EBSB) 10-Q 9 Aug 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 31, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Trading Symbol	EBSB
Entity Registrant Name	Meridian Bancorp, Inc.
Entity Central Index Key	1,600,125
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		53,918,760

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
ASSETS
Cash and due from banks	$ 234,776	$ 236,423
Certificates of deposit	85,323	80,323
Securities available for sale, at fair value	52,362	67,663
Federal Home Loan Bank stock, at cost	22,579	18,175
Loans held for sale	2,257	3,944
Loans, net of fees and costs	4,299,064	3,938,817
Less: allowance for loan losses	(43,229)	(40,149)
Loans, net	4,255,835	3,898,668
Bank-owned life insurance	41,325	40,745
Premises and equipment, net	40,621	41,427
Accrued interest receivable	11,068	10,381
Deferred tax asset, net	21,728	21,461
Goodwill	13,687	13,687
Other assets	5,853	3,105
Total assets	4,787,414	4,436,002
Deposits:
Non interest-bearing	457,009	431,222
Interest-bearing	3,202,908	3,044,615
Total deposits	3,659,917	3,475,837
Short-term borrowings	40,000	0
Long-term debt	434,015	322,512
Accrued expenses and other liabilities	26,753	30,356
Total liabilities	4,160,685	3,828,705
Stockholders' equity:
Preferred stock, $0.01 par value, 50,000,000 shares authorized; none issued
Common stock, $0.01 par value, 100,000,000 shares authorized; 53,649,946 and 53,596,105 shares issued and outstanding at June 30, 2017 and December 31, 2016, respectively	537	536
Additional paid-in capital	392,446	390,065
Retained earnings	250,800	234,290
Accumulated other comprehensive income	1,905	1,806
Unearned compensation - ESOP, 2,617,918 and 2,678,800 shares at June 30, 2017 and December 31, 2016, respectively	(18,959)	(19,400)
Total stockholders' equity	626,729	607,297
Total liabilities and stockholders' equity	$ 4,787,414	$ 4,436,002

Consolidated Balance Sheets (U3

Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	53,649,946	53,596,105
Common stock, shares outstanding	53,649,946	53,596,105
Unearned compensation, ESOP	2,617,918	2,678,800

Consolidated Statements of Net

Consolidated Statements of Net Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest and dividend income:
Interest and fees on loans	$ 43,195	$ 34,828	$ 83,684	$ 67,925
Interest on debt securities:
Taxable	83	238	202	504
Tax-exempt	8	32	18	65
Dividends on equity securities	291	418	568	818
Interest on certificates of deposit	196	135	408	305
Other interest and dividend income	736	188	1,381	406
Total interest and dividend income	44,509	35,839	86,261	70,023
Interest expense:
Interest on deposits	7,935	5,661	15,354	10,889
Interest on short-term borrowings	4		4	6
Interest on long-term debt	1,114	723	2,094	1,294
Total interest expense	9,053	6,384	17,452	12,189
Net interest income	35,456	29,455	68,809	57,834
Provision for loan losses	1,497	3,952	3,116	5,018
Net interest income, after provision for loan losses	33,959	25,503	65,693	52,816
Non-interest income:
Customer service fees	2,214	2,137	4,266	4,086
Loan fees	1,634	(22)	1,702	290
Mortgage banking gains, net	82	104	172	174
Gain on sales of securities, net	808	68	2,382	127
Income from bank-owned life insurance	292	296	580	598
Total non-interest income	5,030	2,583	9,102	5,275
Non-interest expenses:
Salaries and employee benefits	12,752	11,979	26,427	24,492
Occupancy and equipment	3,036	2,867	6,059	5,351
Data processing	1,474	1,254	2,853	2,511
Marketing and advertising	953	699	1,807	1,412
Professional services	1,106	720	2,241	1,333
Deposit insurance	813	532	1,504	984
Other general and administrative	1,271	1,271	2,391	2,469
Total non-interest expenses	21,405	19,322	43,282	38,552
Income before income taxes	17,584	8,764	31,513	19,539
Provision for income taxes	6,237	2,857	10,922	6,155
Net income	$ 11,347	$ 5,907	$ 20,591	$ 13,384
Earnings per share:
Basic	$ 0.22	$ 0.12	$ 0.40	$ 0.26
Diluted	$ 0.22	$ 0.11	$ 0.39	$ 0.26
Weighted average shares:
Basic	51,003,967	51,026,985	50,976,950	51,298,334
Diluted	52,422,486	52,137,475	52,474,761	52,400,698

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income		$ 11,347	$ 5,907	$ 20,591	$ 13,384
Securities available for sale:
Unrealized holding gain		596	2,497	2,554	3,872
Reclassification adjustment for gains realized in income	[1]	(808)	(68)	(2,382)	(127)
Net unrealized (loss) gain		(212)	2,429	172	3,745
Tax effect		83	(980)	(73)	(1,554)
Total other comprehensive (loss) income		(129)	1,449	99	2,191
Comprehensive income		$ 11,218	$ 7,356	$ 20,690	$ 15,575
[1]	Amounts are included in gain on sales of securities, net in the Consolidated Statements of Net Income. Provision for income tax associated with the reclassification adjustments for the three months ended June 30, 2017 and 2016 were $316,000 and $27,000, respectively, and for the six months ended June 30, 2017 and 2016 were $1.0 million and $53,000, respectively.

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Income tax associated with reclassification adjustments	$ 316,000	$ 27,000	$ 1,000,000	$ 53,000

Consolidated Statements of Chan

Consolidated Statements of Changes In Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Unearned Compensation - ESOP [Member]
Beginning Balance at Dec. 31, 2015	$ 588,126	$ 549	$ 403,737	$ 206,214	$ (2,092)	$ (20,282)
Beginning balance, shares at Dec. 31, 2015		54,875,237
Comprehensive income	15,575			13,384	2,191
Dividends declared	(3,059)			(3,059)
Repurchased stock related to buyback program	(16,955)	$ (12)	(16,943)
Repurchased stock related to buyback program, shares		(1,220,711)
ESOP shares earned	857		416			441
Share-based compensation expense - restricted stock, net of awards forfeited	1,057		1,057
Share-based compensation expense - restricted stock, net of awards forfeited, shares		(7,390)
Share-based compensation expense - stock options, net of awards forfeited	593		593
Excess tax benefits in connection with share-based compensation	306		306
Stock options exercised	152		152
Stock options exercised, shares		41,430
Ending Balance at Jun. 30, 2016	586,652	$ 537	389,318	216,539	99	(19,841)
Ending balance, shares at Jun. 30, 2016		53,688,566
Beginning Balance at Dec. 31, 2016	$ 607,297	$ 536	390,065	234,290	1,806	(19,400)
Beginning balance, shares at Dec. 31, 2016	53,596,105	53,596,105
Comprehensive income	$ 20,690			20,591	99
Dividends declared	(4,081)			(4,081)
ESOP shares earned	1,098	$ 0	657			441
Share-based compensation expense - restricted stock, net of awards forfeited	985		985
Share-based compensation expense - restricted stock, net of awards forfeited, shares		(9,440)
Share-based compensation expense - stock options, net of awards forfeited	556		556
Stock options exercised	184	$ 1	183
Stock options exercised, shares		63,281
Ending Balance at Jun. 30, 2017	$ 626,729	$ 537	$ 392,446	$ 250,800	$ 1,905	$ (18,959)
Ending balance, shares at Jun. 30, 2017	53,649,946	53,649,946

Consolidated Statements of Cha8

Consolidated Statements of Changes In Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Dividends declared per share	$ 0.08	$ 0.06
ESOP shares earned	60,882	60,882
Common Stock [Member]
Dividends declared per share	$ 0.08	$ 0.06
ESOP shares earned	60,882	60,882
Additional Paid-in Capital [Member]
Dividends declared per share	$ 0.08	$ 0.06
ESOP shares earned	60,882	60,882
Retained Earnings [Member]
Dividends declared per share	$ 0.08	$ 0.06
ESOP shares earned	60,882	60,882
Accumulated Other Comprehensive Income (Loss) [Member]
Dividends declared per share	$ 0.08	$ 0.06
ESOP shares earned	60,882	60,882
Unearned Compensation - ESOP [Member]
Dividends declared per share	$ 0.08	$ 0.06
ESOP shares earned	60,882	60,882

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income	$ 20,591	$ 13,384
Adjustments to reconcile net income to net cash provided by operating activities:
Accretion of acquisition fair value adjustments	(80)	(74)
ESOP shares earned expense	1,098	857
Provision for loan losses	3,116	5,018
Accretion of net deferred loan origination fees	(479)	(494)
Net accretion of securities available for sale	(11)	(33)
Depreciation and amortization expense	1,580	1,462
Gain on sales of securities, net	(2,382)	(127)
Net loss and provision for foreclosed real estate		23
Deferred income tax benefit	(340)	(540)
Income from bank-owned life insurance	(580)	(598)
Share-based compensation expense	1,541	1,650
Net changes in:
Loans held for sale	1,687	2,272
Accrued interest receivable	(687)	(672)
Other assets	(2,145)	(5,639)
Accrued expenses and other liabilities	(4,116)	(2,034)
Net cash provided by operating activities	18,793	14,455
Cash flows from investing activities:
Purchases of certificates of deposit	(5,000)	(20,292)
Maturities of certificates of deposit		84,012
Activity in securities available for sale:
Proceeds from maturities, calls and principal payments	10,989	12,790
Purchase of mutual funds, net	(35)	970
Proceeds from sales	11,584	5,023
Purchases	(5,274)	(5,182)
Loans originated, net of principal payments received	(359,775)	(466,483)
Purchases of premises and equipment	(733)	(1,994)
Purchase of Federal Home Loan Bank stock	(4,404)	(6,887)
Proceeds from sale of foreclosed real estate		432
Net cash used in investing activities	(352,648)	(397,611)
Cash flows from financing activities:
Net increase in deposits	184,089	255,028
Net change in borrowings with maturities less than three months	40,000	(20,000)
Proceeds from Federal Home Loan Bank advances with maturities of three months or more	205,625	210,000
Repayment of Federal Home Loan Bank advances with maturities of three months or more	(94,122)	(36,602)
Cash dividends paid on common stock	(3,568)	(3,095)
Stock options exercised	184	152
Repurchase of common stock		(16,955)
Net cash provided by financing activities	332,208	388,528
Net change in cash and cash equivalents	(1,647)	5,372
Cash and cash equivalents at beginning of period	236,423	96,363
Cash and cash equivalents at end of period	234,776	101,735
Supplemental cash flow information:
Interest paid on deposits	17,429	10,850
Interest paid on borrowings	1,982	1,206
Income taxes paid, net of refunds	14,035	12,241
Non-cash investing and financing activities:
Transfers from loans to foreclosed real estate		$ 638
Net amounts due from broker on security transactions	$ 603

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	1 . BASIS OF PRESENTATION The consolidated financial statements include the accounts of Meridian Bancorp, Inc. (the “Company”) and all other entities in which it has a controlling financial interest. The Company owns 100% of the outstanding shares of East Boston Savings Bank (the “Bank”). The Bank’s subsidiaries include: (1) Prospect, Inc., which engages in securities transactions on its own behalf; (2) EBOSCO, LLC, which holds foreclosed real estate; and (3) East Boston Investment Services, Inc., which is authorized for third-party investment sales and is currently inactive. All significant intercompany balances and transactions have been eliminated in consolidation. The accompanying unaudited interim consolidated financial statements of the Company have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by such generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation have been included. Such adjustments were of a normal recurring nature. The results of operations for the three and six months ended June 30, 2017 are not necessarily indicative of the results that may be expected for the entire year or any other interim period. For additional information, refer to the financial statements and footnotes thereto of the Company included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016, which was filed with the Securities and Exchange Commission (the “SEC”) on March 1, 2017, and is available through the SEC’s website at www.sec.gov In preparing consolidated financial statements in conformity with GAAP, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the consolidated balance sheet and reported amounts of revenues and expenses during the reported period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for loan losses and the evaluation of securities for other-than-temporary impairment. Change in accounting principle — Share-based compensation In March 2016, the Financial Accounting Standards Board (the “FASB”) issued an Accounting Standards Update (“ASU”), No. 2016-09, Compensation — Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting Accounting for Income Taxes Entities will no longer record the excess tax benefits or deficiencies related to share-based compensation in additional paid-in capital. Instead, they will record excess tax benefits or deficiencies in income tax expense or benefit in the income statement as part of the provision for income taxes on a prospective basis. For interim reporting purposes the excess tax benefits or deficiencies will be recorded as discrete items in the period in which they occur. The presentation of the excess tax benefits will be presented as an operating activity in the statement of cash flows. In addition, under the new guidance, when calculating incremental shares for earnings per share, entities exclude from assumed proceeds excess tax benefits that previously would have been recorded in additional paid-in capital. The total income tax benefit recorded in the provision for income taxes for the six months ended June 30, 2017 was $358,000.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	6 Months Ended
	Jun. 30, 2017
Accounting Changes and Error Corrections [Abstract]
Recent Accounting Pronouncements	2. RECENT ACCOUNTING PRONOUNCEMENTS In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments — Overall, (Subtopic 825-10). In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments — Credit Losses (Topic 326) In January 2017, the FASB issued ASU No. 2017-04, Intangibles — Goodwill and Other (Topic 350)

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share	3. EARNINGS PER SHARE Basic earnings per share excludes dilution and is calculated by dividing net income available to common stockholders by the weighted-average number of common shares outstanding during the period. Rights to dividends on unvested stock awards are non-forfeitable, therefore these unvested stock awards are considered outstanding in the computation of basic earnings per share. Diluted earnings per share is computed in a manner similar to that of basic earnings per share except that the weighted-average number of common shares outstanding is increased to include the number of incremental common shares (computed using the treasury method) that would have been outstanding if all potentially dilutive common stock equivalents (such as options) were issued during the period. Unallocated common shares held by the ESOP are shown as a reduction in stockholders’ equity and are not included in the weighted-average number of common shares outstanding for either basic or diluted earnings per share calculations. Basic and diluted earnings per share have been computed based on the following: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (Dollars in thousands, except per share amounts) Net income available to common stockholders $ 11,347 $ 5,907 $ 20,591 $ 13,384 Basic weighted average shares outstanding 51,003,967 51,026,985 50,976,950 51,298,334 Effect of dilutive stock options 1,418,519 1,110,490 1,497,811 1,102,364 Diluted weighted average shares outstanding $ 52,422,486 52,137,475 $ 52,474,761 52,400,698 Earnings per share: Basic $ 0.22 $ 0.12 $ 0.40 $ 0.26 Diluted $ 0.22 $ 0.11 $ 0.39 $ 0.26 For the three and six months ended June 30, 2017 there were no anti-dilutive options. An anti-dilutive option exists when the average stock price for the period is less than the exercise price of the option. For the three and six months ended June 30, 2016, options for the exercise of 248,904 shares and 320,829 shares, respectively, were not included in the calculation of diluted earnings per share because to do so would have been anti-dilutive. On July 31, 2017, the Company granted 682,750 stock options and 272,750 restricted stock awards under the 2015 Equity Incentive Plan to its directors and officers, including named executive officers of the Company. Awards vest 20% per year over a period of five years beginning one year from the date of grant.

Securities Available for Sale

Securities Available for Sale	6 Months Ended
	Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Securities Available for Sale	4. SECURITIES AVAILABLE FOR SALE The amortized cost and fair values of securities available for sale, with gross unrealized gains and losses, follows: Amortized Gross Gross Fair (In thousands) June 30, 2017 Debt securities: Corporate bonds-financial services $ 5,001 $ — $ (1 ) $ 5,000 Municipal bonds 626 15 — 641 Residential mortgage-backed securities: Government-sponsored enterprises 4,574 288 (2 ) 4,860 Private label 76 6 — 82 Total debt securities 10,277 309 (3 ) 10,583 Marketable equity securities: Common stocks: Basic materials 4,561 323 (561 ) 4,323 Consumer products and services 11,775 1,059 (655 ) 12,179 Financial services 6,019 1,189 (25 ) 7,183 Healthcare 8,596 1,294 (2 ) 9,888 Industrials 4,245 633 (42 ) 4,836 Technology 3,043 376 (86 ) 3,333 Total common stocks 38,239 4,874 (1,371 ) 41,742 Money market mutual funds 37 — — 37 Total marketable equity securities 38,276 4,874 (1,371 ) 41,779 Total securities available for sale $ 48,553 $ 5,183 $ (1,374 ) $ 52,362 December 31, 2016 Debt securities: Corporate bonds: Financial services $ 12,989 $ 16 $ (3 ) $ 13,002 Industrials 1,000 3 — 1,003 Total corporate bonds 13,989 19 (3 ) 14,005 Municipal bonds 1,202 17 — 1,219 Residential mortgage-backed securities: Government-sponsored enterprises 5,284 325 (3 ) 5,606 Private label 779 22 — 801 Total debt securities 21,254 383 (6 ) 21,631 Marketable equity securities: Common stocks: Basic materials 6,763 901 (232 ) 7,432 Consumer products and services 13,567 1,093 (382 ) 14,278 Financial services 5,953 970 — 6,923 Healthcare 8,225 533 (456 ) 8,302 Industrials 4,181 624 (11 ) 4,794 Technology 4,081 440 (220 ) 4,301 Total common stocks 42,770 4,561 (1,301 ) 46,030 Money market mutual funds 2 — — 2 Total marketable equity securities 42,772 4,561 (1,301 ) 46,032 Total securities available for sale $ 64,026 $ 4,944 $ (1,307 ) $ 67,663 At June 30, 2017, securities with an amortized cost of $3.6 million and $483,000 were pledged as collateral for Federal Home Loan Bank of Boston (“FHLB”) borrowings and for the Federal Reserve Bank discount window borrowings, respectively. The amortized cost and fair value of debt securities by contractual maturity at June 30, 2017 are as follows. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without prepayment penalties. One Year or Less After One Year After Five Years Total Amortized Fair Amortized Fair Amortized Fair Amortized Fair (In thousands) Corporate bonds-financial services $ 5,001 $ 5,000 $ — $ — $ — $ — $ 5,001 $ 5,000 Municipal bonds 626 641 — — — — 626 641 Residential mortgage-backed securities: Government-sponsored enterprises — — 1 1 4,573 4,859 4,574 4,860 Private label — — — — 76 82 76 82 Total $ 5,627 $ 5,641 $ 1 $ 1 $ 4,649 $ 4,941 $ 10,277 $ 10,583 For the three months ended June 30, 2017 and 2016, proceeds from sales of securities available for sale amounted to $3.2 million and $1.1 million, respectively. Gross gains of $808,000 and $324,000, respectively, were realized on those sales. There were $256,000 in gross losses realized on the sales for the three months ended June 30, 2016. For the six months ended June 30, 2017 and 2016, proceeds from the sales of securities available for sale amounted to $11.6 million and $5.0 million, respectively. Gross gains of $2.4 million and $1.2 million and gross losses of $21,000 and $1.1 million, respectively, were realized on those sales. Information pertaining to securities available for sale as of June 30, 2017 and December 31, 2016, with gross unrealized losses aggregated by investment category and length of time that individual securities have been in a continuous loss position, follows: Less Than Twelve Months Twelve Months or Longer Gross Fair Gross Fair (In thousands) June 30, 2017 Debt securities: Corporate bonds-financial services $ 1 $ 5,000 $ — $ — Residential mortgage-backed securities: Government-sponsored enterprises — — 2 176 Total debt securities 1 5,000 2 176 Marketable equity securities: Common stocks: Basic materials 149 1,592 412 1,388 Consumer products and services 512 2,862 143 1,065 Financial services 25 488 — — Healthcare 2 1,119 — — Industrials 42 694 — — Technology 32 968 54 291 Total common stocks and marketable equity securities 762 7,723 609 2,744 Total temporarily impaired securities $ 763 $ 12,723 $ 611 $ 2,920 Less Than Twelve Months Twelve Months or Longer Gross Fair Gross Fair (In thousands) December 31, 2016 Debt securities: Corporate bonds-financial services $ 3 $ 5,000 $ — $ — Residential mortgage-backed securities: Government-sponsored enterprises — — 3 205 Total debt securities 3 5,000 3 205 Marketable equity securities: Common stocks: Basic materials — — 232 1,568 Consumer products and services 237 3,496 145 1,618 Healthcare 259 2,039 197 1,377 Industrials 11 450 — — Technology — — 220 1,681 Total common stocks and marketable equity securities 507 5,985 794 6,244 Total temporarily impaired securities $ 510 $ 10,985 $ 797 $ 6,449 The Company determined no securities were other-than-temporarily impaired for the six months ended June 30, 2017, and 2016. Management evaluates securities for other-than-temporary impairment on a quarterly basis, with more frequent evaluation for selected issuers or when economic or market concerns warrant such evaluations. At June 30, 2017, 19 marketable equity securities with a fair value of $10.5 million had gross unrealized losses totaling $1.4 million, or an aggregate depreciation of 11.6% from the Company’s cost basis. These marketable equity securities consisted of 13 securities with a fair value of $7.7 million and a gross unrealized loss of $762,000 for less than 12 months and six securities with a fair value of $2.7 million and a gross unrealized loss of $609,000 for 12 months or longer. The marketable equity securities in a gross unrealized loss position for 12 months or longer were comprised of three securities in the basic materials sector with a fair value of $1.4 million and a gross unrealized loss of $412,000, two securities in the consumer products and services sector with a fair value of $1.1 million and a gross unrealized loss of $143,000, and one security in the technology sector with a fair value of $291,000 and a gross unrealized loss of $54,000. In analyzing an equity issuer’s financial condition, management considers industry analysts’ reports, financial performance and projected target prices of investment analysts within a one-year time frame. A decline of 10% or more in the value of an acquired equity security is generally the triggering event for management to review individual securities for liquidation and/or write-down. Impairment losses are recognized when management concludes that declines in the value of equity securities are other than temporary, or when they can no longer assert that they have the intent and ability to hold depreciated equity securities for a period of time sufficient to allow for any anticipated recovery in fair value. Unrealized losses on marketable equity securities that are in excess of 25% of cost and that have been sustained for more than twelve months are generally considered-other-than temporary and charged to earnings as impairment losses, or realized through sale of the security. Although issuers within the marketable equity securities portfolio had price declines resulting in unrealized losses, management does not believe these declines in market value are other than temporary and the Company currently has the ability and intent to hold these investments until a recovery of fair value.

Loans

Loans	6 Months Ended
	Jun. 30, 2017
Receivables [Abstract]
Loans	5. LOANS A summary of loans follows: June 30, 2017 December 31, 2016 Amount Percent Amount Percent (Dollars in thousands) Real estate loans: Residential real estate: One- to four-family $ 552,762 12.8 % $ 532,450 13.5 % Home equity lines of credit 42,599 1.0 42,913 1.1 Multi-family 695,602 16.2 562,948 14.3 Commercial real estate 1,927,572 44.8 1,776,601 45.1 Construction 517,471 12.0 502,753 12.8 Total real estate loans 3,736,006 86.8 3,417,665 86.8 Commercial and industrial 557,443 13.0 515,430 13.0 Consumer 10,058 0.2 9,712 0.2 Total loans 4,303,507 100.0 % 3,942,807 100.0 % Allowance for loan losses (43,229 ) (40,149 ) Net deferred loan origination fees (4,443 ) (3,990 ) Loans, net $ 4,255,835 $ 3,898,668 The Company has transferred a portion of its originated commercial real estate loans to participating lenders. The amounts transferred have been accounted for as sales and are therefore not included in the Company’s accompanying balance sheets. The Company and participating lenders share ratably in any gains or losses that may result from a borrower’s lack of compliance with contractual terms of the loan. The Company continues to service the loans on behalf of the participating lenders and, as such, collects cash payments from the borrowers, remits payments to participating lenders and disburses required escrow funds to relevant parties. At June 30, 2017 and December 31, 2016, the Company was servicing loans for participants aggregating $252.5 million and $210.5 million, respectively. At June 30, 2017, multi-family and commercial real estate loans with carrying values totaling $66.3 million and $451.4 million, respectively, were pledged as collateral for FHLB borrowings. An analysis of the allowance for loan losses and related information follows: Three Months Ended June 30, 2017 One- to four- Multi- family Home equity of credit Commercial real estate Construction Commercial industrial Consumer Total (In thousands) Beginning balance $ 1,352 $ 4,704 $ 84 $ 19,141 $ 9,911 $ 6,480 $ 92 $ 41,764 Provision (credit) for loan losses (188 ) 844 (13 ) 1,457 (1,068 ) 421 44 1,497 Charge-offs — — — — (2 ) — (75 ) (77 ) Recoveries 3 1 — — 5 — 36 45 Ending balance $ 1,167 $ 5,549 $ 71 $ 20,598 $ 8,846 $ 6,901 $ 97 $ 43,229 Three Months Ended June 30, 2016 One- to four- Multi- Home equity Commercial real estate Construction Commercial industrial Consumer Total (In thousands) Beginning balance $ 1,385 $ 3,487 $ 96 $ 15,083 $ 7,789 $ 6,459 $ 91 $ 34,390 Provision (credit) for loan losses (65 ) 515 (4 ) 1,867 1,294 284 61 3,952 Charge-offs — — — — — — (70 ) (70 ) Recoveries — — — — 7 8 30 45 Ending balance $ 1,320 $ 4,002 $ 92 $ 16,950 $ 9,090 $ 6,751 $ 112 $ 38,317 Six Months Ended June 30, 2017 One- to four- Multi- Home equity Commercial real estate Construction Commercial industrial Consumer Total (In thousands) Beginning balance $ 1,367 $ 4,514 $ 73 $ 18,725 $ 8,931 $ 6,452 $ 87 $ 40,149 Provision (credit) for loan losses (233 ) 1,034 (2 ) 1,873 (133 ) 449 128 3,116 Charge-offs — — — — (2 ) — (166 ) (168 ) Recoveries 33 1 — — 50 — 48 132 Ending balance $ 1,167 $ 5,549 $ 71 $ 20,598 $ 8,846 $ 6,901 $ 97 $ 43,229 Six Months Ended June 30, 2016 One- to four- Multi- Home equity Commercial real estate Construction Commercial industrial Consumer Total (In thousands) Beginning balance $ 1,354 $ 3,385 $ 144 $ 14,497 $ 8,313 $ 5,620 $ 92 $ 33,405 Provision (credit) for loan losses (34 ) 617 (52 ) 2,453 763 1,167 104 5,018 Charge-offs — — — — — (44 ) (134 ) (178 ) Recoveries — — — — 14 8 50 72 Ending balance $ 1,320 $ 4,002 $ 92 $ 16,950 $ 9,090 $ 6,751 $ 112 $ 38,317 One- to four- Multi- family Home equity lines of credit Commercial real estate Construction Commercial and industrial Consumer Total (In thousands) June 30, 2017 Amount of allowance for loan losses for loans deemed to be impaired $ 51 $ 133 $ — $ 2 $ — $ — $ — $ 186 Amount of allowance for loan losses for loans not deemed to be impaired 1,116 5,416 71 20,596 8,846 6,901 97 43,043 $ 1,167 $ 5,549 $ 71 $ 20,598 $ 8,846 $ 6,901 $ 97 $ 43,229 Loans deemed to be impaired $ 1,384 $ 1,337 $ — $ 2,667 $ 173 $ 1,616 $ — $ 7,177 Loans not deemed to be impaired 551,378 694,265 42,599 1,924,905 517,298 555,827 10,058 4,296,330 $ 552,762 $ 695,602 $ 42,599 $ 1,927,572 $ 517,471 $ 557,443 $ 10,058 $ 4,303,507 December 31, 2016 Amount of allowance for loan losses for loans deemed to be impaired $ 49 $ 137 $ — $ — $ — $ — $ — $ 186 Amount of allowance for loan losses for loans not deemed to be impaired 1,318 4,377 73 18,725 8,931 6,452 87 39,963 $ 1,367 $ 4,514 $ 73 $ 18,725 $ 8,931 $ 6,452 $ 87 $ 40,149 Loans deemed to be impaired $ 1,422 $ 1,359 $ — $ 2,807 $ 988 $ 1,808 $ — $ 8,384 Loans not deemed to be impaired 531,028 561,589 42,913 1,773,794 501,765 513,622 9,712 3,934,423 $ 532,450 $ 562,948 $ 42,913 $ 1,776,601 $ 502,753 $ 515,430 $ 9,712 $ 3,942,807 The following table provides information about the Company’s past due and non-accrual loans: 30-59 60-89 90 Days Total Loans on Non-accrual (In thousands) June 30, 2017 Real estate loans: Residential real estate: One- to four-family $ 903 $ 702 $ 892 $ 2,497 $ 7,667 Home equity lines of credit 786 297 115 1,198 619 Commercial real estate 102 — 1,790 1,892 2,666 Total real estate loans 1,791 999 2,797 5,587 10,952 Commercial and industrial 5 — 529 534 529 Consumer 816 405 — 1,221 — Total $ 2,612 $ 1,404 $ 3,326 $ 7,342 $ 11,481 December 31, 2016 Real estate loans: Residential real estate: One- to four-family $ 641 $ 834 $ 2,902 $ 4,377 $ 8,487 Home equity lines of credit 707 131 672 1,510 674 Commercial real estate 105 — 1,904 2,009 2,807 Construction — — 815 815 815 Total real estate loans 1,453 965 6,293 8,711 12,783 Commercial and industrial — — 653 653 653 Consumer 679 392 — 1,071 — Total $ 2,132 $ 1,357 $ 6,946 $ 10,435 $ 13,436 At June 30, 2017 and December 31, 2016, the Company did not have any accruing loans past due 90 days or more. The following tables provide information with respect to the Company’s impaired loans: June 30, 2017 December 31, 2016 Recorded Unpaid Related Recorded Unpaid Related (In thousands) Impaired loans without a valuation allowance: One- to four-family $ 812 $ 1,263 $ 841 $ 1,281 Multi-family 66 66 74 74 Commercial real estate 2,256 2,565 2,807 3,102 Construction 173 173 988 1,083 Commercial and industrial 1,616 1,946 1,808 2,138 Total 4,923 6,013 6,518 7,678 Impaired loans with a valuation allowance: One- to four-family 572 572 $ 51 581 581 $ 49 Multi-family 1,271 1,271 133 1,285 1,285 137 Commercial real estate 411 411 2 — — — Total 2,254 2,254 186 1,866 $ 1,866 186 Total impaired loans $ 7,177 $ 8,267 $ 186 $ 8,384 $ 9,544 $ 186 At June 30, 2017, additional funds committed to be advanced in connection with impaired construction loans were immaterial. Three Months Ended June 30, 2017 2016 Average Interest Interest Average Interest Interest (In thousands) One- to four-family $ 1,550 $ 16 $ 11 $ 1,699 $ 16 $ 10 Multi-family 1,342 13 — 1,385 14 — Commercial real estate 2,762 24 24 3,937 14 14 Construction 173 2 — 14,017 9 6 Commercial and industrial 1,638 16 — 1,980 18 — Total impaired loans $ 7,465 $ 71 $ 35 $ 23,018 $ 71 $ 30 Six Months Ended June 30, 2017 2016 Average Interest Interest Average Interest Interest (In thousands) One- to four-family $ 1,559 $ 35 $ 25 $ 1,709 $ 36 $ 25 Multi-family 1,348 27 — 1,390 27 — Commercial real estate 2,781 33 33 3,805 53 53 Construction 580 4 — 14,771 17 10 Commercial and industrial 1,714 32 — 1,376 49 13 Total impaired loans $ 7,982 $ 131 $ 58 $ 23,051 $ 182 $ 101 The following table summarizes the troubled debt restructurings (“TDRs”) at the dates indicated: June 30, December 31, (In thousands) TDRs on accrual status: One- to four-family $ 2,182 $ 2,219 Multi-family 1,337 1,359 Home equity lines of credit 17 18 Commercial real estate 9,331 9,460 Construction 173 174 Commercial and industrial 24 27 Total TDRs on accrual status 13,064 13,257 TDRs on non-accrual status: One- to four-family 1,095 1,123 Total TDRs on non-accrual status 1,095 1,123 Total TDRs $ 14,159 $ 14,380 The Company generally places loans modified as TDRs on non-accrual status for a minimum period of six months. Loans modified as TDRs qualify for return to accrual status once they have demonstrated performance with the modified terms of the loan agreement for a minimum of six months and future payments are reasonably assured. TDRs are initially reported as impaired loans with an allowance established as part of the allocated component of the allowance for loan losses when the discounted cash flows of the impaired loan is lower than the carrying value of that loan. TDRs may be removed from impairment disclosures in the year following the restructure if the borrower demonstrates compliance with the modified terms and the restructuring agreement specifies an interest rate equal to that which would be provided to a borrower with similar credit at the time of restructuring. At both June 30, 2017 and December 31, 2016, the allowance for loan losses included an allocated component related to TDRs of $186,000. There were no charge-offs related to the TDRs modified during the six months ended June 30, 2017 and 2016. TDRs that defaulted and became 90 days past due in the first twelve months after being restructured were immaterial for the six months ended June 30, 2017, and 2016. The Company utilizes a ten-grade internal loan rating system for multi-family, commercial real estate, construction, and commercial and industrial loans as follows: • Loans rated 1, 2, 3, 4, 5 and 6: • Loans rated 7: • Loans rated 8: • Loans rated 9: • Loans rated 10: On an annual basis, or more often if needed, the Company formally reviews the ratings on multi-family, commercial real estate, construction, and commercial and industrial loans. The Company also engages an independent third-party to review a significant portion of loans within these segments on at least an annual basis. Management uses the results of these reviews as part of its annual review process. The following tables provide the Company’s risk-rated loans by class: June 30, 2017 December 31, 2016 Multi-family Commercial Construction Commercial Multi-family Commercial Construction Commercial (In thousands) Loans rated 1 - 6 $ 690,236 $ 1,923,617 $ 517,298 $ 501,746 $ 556,892 $ 1,771,671 $ 500,565 $ 465,979 Loans rated 7 818 1,289 — 27,888 841 2,123 — 22,820 Loans rated 8 4,548 2,666 173 27,809 5,215 2,807 2,188 26,631 Loans rated 9 — — — — — — — — Loans rated 10 — — — — — — — — Total $ 695,602 $ 1,927,572 $ 517,471 $ 557,443 $ 562,948 $ 1,776,601 $ 502,753 $ 515,430 For one- to four-family residential real estate loans, home equity lines of credit and consumer loans, management uses delinquency reports as the key credit quality indicator.

Deposits

Deposits	6 Months Ended
	Jun. 30, 2017
Banking and Thrift [Abstract]
Deposits	6. DEPOSITS A summary of deposit balances, by type, follows: June 30, December 31, (In thousands) Demand deposits $ 457,009 $ 431,222 NOW deposits 779,208 630,413 Money market deposits 972,720 980,344 Regular savings and other deposits 321,674 305,632 Total non-certificate accounts 2,530,611 2,347,611 Term certificates less than $250,000 842,316 850,565 Term certificates $250,000 and greater 286,990 277,661 Total certificate accounts 1,129,306 1,128,226 Total deposits $ 3,659,917 $ 3,475,837 A summary of term certificates, by maturity, follows: June 30, 2017 December 31, 2016 Maturing Amount Weighted Amount Weighted (Dollars in thousands) Within 1 year $ 632,469 1.20 % $ 539,903 1.16 % Over 1 year to 2 years 187,715 1.29 306,120 1.29 Over 2 years to 3 years 223,809 1.94 122,952 1.69 Over 3 years to 4 years 59,347 1.92 133,256 2.02 Over 4 years to 5 years 22,371 1.88 22,483 1.61 Greater than 5 years 3,595 5.50 3,512 5.50 $ 1,129,306 1.43 % $ 1,128,226 1.38 % The Company had brokered certificates of deposit, which are included in term certificates in the tables above, totaling $152.9 million with a weighted average rate of 1.49% and $158.5 million with a weighted average rate of 1.33% at June 30, 2017 and December 31, 2016, respectively. At June 30, 2017 and December 31, 2016, the Company also had brokered NOW deposits totaling $436.6 million and $296.3 million representing reciprocal deposits received from other financial institutions through Authorized Bank Deposit Placement Network Sponsor to facilitate full federal deposit insurance coverage for certain Bank customers.

Borrowings

Borrowings	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Borrowings	7. BORROWINGS At June 30, 2017, short-term borrowings with an original maturity of less than one year consisted of an FHLB advance totaling $40.0 million with a rate of 1.30% that matured on July 3, 2017. The Company had no short-term borrowings on December 31, 2016. The Company has an available line of credit of $9.4 million with the FHLB at an interest rate that adjusts daily and $483,000 of borrowing capacity at the Federal Reserve Bank discount window. No amounts were drawn on the line of credit and no borrowings were outstanding with the Federal Reserve Bank discount window as of June 30, 2017 or December 31, 2016. Long-term debt consists of FHLB advances as follows: June 30, 2017 December 31, 2016 Amount Weighted Amount Weighted (Dollars in thousands) Fixed rate advances maturing: 2017 $ 17,132 1.07 % $ 89,632 1.32 % 2018 43,000 1.25 43,000 1.25 2019 3,986 1.23 4,891 1.23 2020 54,272 1.79 4,989 1.22 2021 60,000 1.42 45,000 1.46 2022 60,625 1.75 — — 2023 10,000 2.10 10,000 2.10 2026 10,000 0.69 20,000 0.59 2027 25,000 1.38 — — 2031 20,000 0.88 20,000 0.88 2032 45,000 1.03 — — 349,015 1.41 237,512 1.26 Variable rate advances maturing: 2020 — — 25,000 0.27 2021 35,000 0.58 60,000 0.31 2022 30,000 0.26 — — 2024 20,000 0.22 — — 85,000 0.38 85,000 0.29 Total advances $ 434,015 1.21 % $ 322,512 1.01 % At June 30, 2017, advances amounting to $290.0 million are callable by the FHLB prior to maturity, including advances totaling $35.0 million with variable rates based on the 3-Month London Interbank Offered Rate (“LIBOR”), less 60 basis points, during the first two years and $50.0 million with variable rates based on the 3-Month LIBOR, less 100 basis points, during the first year. All borrowings from the FHLB are secured by investment securities and qualified collateral, consisting of a blanket lien on one- to four-family loans and certain multi-family and commercial real estate loans held in the Company’s portfolio. At June 30, 2017, the Company pledged multi-family and commercial real estate loans with carrying values totaling $66.3 million and $451.4 million, respectively.

Other Commitments and Contingen

Other Commitments and Contingencies and Derivatives	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Other Commitments and Contingencies and Derivatives	8. OTHER COMMITMENTS AND CONTINGENCIES AND DERIVATIVES In the normal course of business, there are outstanding commitments and contingencies which are not reflected in the accompanying consolidated financial statements. Loan Commitments The Company is party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers and to reduce its own exposure to fluctuations in interest rates. The instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the accompanying consolidated balance sheets. The contract amounts of those instruments reflect the extent of involvement the Company has in particular classes of financial instruments. The Company’s exposure to credit loss in the event of nonperformance by the counterparty to the financial instrument for loan commitments is represented by the contractual amount of those instruments. The Company uses the same credit policies in making commitments as it does for on-balance sheet instruments. A summary of outstanding loan commitments whose contract amounts represent credit risk is as follows: June 30, December 31, (In thousands) Unadvanced portion of existing loans: Construction $ 558,108 $ 503,586 Home equity lines of credit 39,824 36,722 Other lines and letters of credit 287,990 314,225 Commitments to originate: One- to four-family 33,613 18,272 Commercial real estate 83,746 42,141 Construction 185,076 231,274 Commercial and industrial 6,300 31,463 Other loans — 350 Total loan commitments outstanding $ 1,194,657 $ 1,178,033 Commitments to originate loans are agreements to lend to a customer provided there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since a portion of the commitments are expected to expire without being drawn upon, the total commitments do not necessarily represent future cash requirements. The Company evaluates each customer’s credit worthiness on a case by case basis. The amount of collateral obtained, if deemed necessary by the Company for the extension of credit, is based upon management’s credit evaluation of the borrower. Collateral held includes, but is not limited to, residential real estate and deposit accounts. Unfunded commitments under lines of credit are commitments for possible future extensions of credit to existing customers. These lines of credit are collateralized if deemed necessary and usually do not contain a specified maturity date and may not be drawn upon to the total extent to which the Company is committed. Letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party. Those letters of credit are primarily issued to support borrowing arrangements. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. Interest Rate Swaps The Company is a party to interest rate derivatives that are not designated as hedging instruments. These derivatives relate to interest rate swaps that the Company enters into with commercial business customers to synthetically convert their loans from a variable rate to a fixed rate. The Company pays interest to the customer at a floating rate on the notional amount and receives interest from the customer at a fixed rate for the same notional amount. Concurrently, the Company enters into an offsetting interest rate swap with a third party financial institution. In the offsetting swap, the Company pays the other financial institution interest at the same fixed rate on the same notional amount as the swap entered into with the customer, and receives interest from the financial institution for the same floating rate on the same notional amount. The changes in the fair value of the swaps offset each other, except for the credit risk of the counterparties, which is determined by taking into consideration the risk rating and probability of default. At June 30, 2017 and December 31, 2016, the Company had $3.2 million and $1.8 million, respectively, in cash pledged for collateral on its interest rate swaps with the third-party financial institution. Summary information regarding these derivatives is presented below: June 30, 2017 December 31, 2016 Maturity Interest Rate Paid Interest Rate Received Notional Fair Notional Fair (Dollars in thousands) Customer interest rate swap 06/06/32 1 Mo. LIBOR + 200bp Fixed (4.40%) $ 66,240 $ 1,059 $ — $ — Third-party interest rate swap 06/06/32 Fixed (4.40%) 1 Mo. LIBOR + 200bp 66,240 (1,059 ) — — Customer interest rate swap 10/17/33 1 Mo. LIBOR + 175bp Fixed (4.1052%) $ 10,818 $ 828 $ 10,922 $ 839 Third-party interest rate swap 10/17/33 Fixed (4.1052%) 1 Mo. LIBOR + 175bp 10,818 (828 ) 10,922 (839 ) Customer interest rate swap 12/13/26 1 Mo. LIBOR + 205bp Fixed (3.82%) $ 2,961 $ (53 ) $ 3,036 $ (60 ) Third-party interest rate swap 12/13/26 Fixed (3.82%) 1 Mo. LIBOR + 205bp 2,961 53 3,036 60 Other Commitments As of June 30, 2017, the Company has an outstanding commitment of $19.5 million with its core data processing provider through December 2021. Employment and Change in Control Agreements The Company has entered into employment agreements with certain senior executives which provide for a minimum annual salary, subject to increase at the discretion of the Board of Directors, and other benefits. The agreements may be terminated for cause by the Company without further liability on the part of the Company, or by the executives with prior written notice to the Board of Directors. The Company also has change in control agreements with several officers which provide a severance payment in the event employment is terminated in conjunction with a defined change in control. Legal Claims Various legal claims may arise from time to time in the normal course of business, but in the opinion of management, these claims are not expected to have a material effect on the Company’s consolidated financial statements.

Fair Values of Assets and Liabi

Fair Values of Assets and Liabilities	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Values of Assets and Liabilities	9. FAIR VALUES OF ASSETS AND LIABILITIES Determination of Fair Value The Company uses fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. The fair value of assets and liabilities is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value is best determined based upon quoted market prices. However, in many instances, there are no quoted market prices for the Company’s various assets and liabilities. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques. Those techniques are significantly affected by the assumptions used including the discount rate and estimates of future cash flows. Accordingly, the fair value estimates may not be realized in an immediate settlement of the asset or liability. The following methods and assumptions were used by the Company in estimating fair value disclosures: Cash and cash equivalents Certificates of deposit Securities available for sale FHLB stock Loans held for sale Loans Deposits Borrowings Accrued interest Loan level interest rate swaps Off-balance sheet credit-related instruments Assets and Liabilities Measured at Fair Value on a Recurring Basis Assets measured at fair value on a recurring basis are summarized as follows. There were no liabilities measured at fair value on a recurring basis. Level 1 Level 2 Level 3 Total Fair (In thousands) June 30, 2017 Assets: Debt securities $ — $ 10,583 $ — $ 10,583 Marketable equity securities 41,779 — — 41,779 Loan level interest rate swaps — 1,834 — 1,834 Total assets $ 41,779 $ 12,417 $ — $ 54,196 Liabilities: Loan level interest rate swaps — 1,834 — 1,834 Total liabilities $ — $ 1,834 $ — $ 1,834 Level 1 Level 2 Level 3 Total Fair (In thousands) December 31, 2016 Assets: Debt securities $ — $ 21,631 $ — $ 21,631 Marketable equity securities 46,032 — — 46,032 Loan level interest rate swaps — 779 — 779 Total assets $ 46,032 $ 22,410 $ — $ 68,442 Liabilities: Loan level interest rate swaps — 779 — 779 Total liabilities $ — $ 779 $ — $ 779 Assets Measured at Fair Value on a Non-recurring Basis The Company may also be required, from time to time, to measure certain other assets on a non-recurring basis in accordance with generally accepted accounting principles. These adjustments to fair value usually result from the application of lower-of-cost-or market accounting or write-downs of individual assets. Certain impaired loans were adjusted to fair value, less cost to sell, of the underlying collateral securing these loans resulting in losses. The loss is not recorded directly as an adjustment to current earnings, but rather as a component in determining the allowance for loan losses. Fair value was measured using appraised values of collateral and adjusted as necessary by management based on unobservable inputs for specific properties. Impaired loans measured at fair value at June 30, 2017 and December 31, 2016 were $3.7 million and $4.9 million, respectively. The related gains and losses were immaterial for the three and six months ended June 30, 2017 and 2016. Summary of Fair Values of Financial Instruments The estimated fair values, and related carrying amounts, of the Company’s financial instruments are as follows. Certain financial instruments and all nonfinancial instruments are exempt from disclosure requirements. Accordingly, the aggregate fair value amounts presented herein do not represent the underlying fair value of the Company. Carrying Amount Fair Value Level 1 Level 2 Level 3 Total (In thousands) June 30, 2017 Financial assets: Cash and due from banks $ 234,776 $ 234,776 $ — $ — $ 234,776 Certificates of deposit 85,323 — 85,646 — 85,646 Securities available for sale 52,362 41,779 10,583 — 52,362 Federal Home Loan Bank stock 22,579 — — 22,579 22,579 Loans and loans held for sale, net 4,258,092 — — 4,334,575 4,334,575 Accrued interest receivable 11,068 — — 11,068 11,068 Financial liabilities: Deposits 3,659,917 — — 3,605,013 3,605,013 Borrowings 474,015 — 475,294 — 475,294 Accrued interest payable 1,532 — — 1,532 1,532 On-balance sheet derivative financial instruments: Assets: Loan level interest rate swaps 1,834 — 1,834 — 1,834 Liabilities: Loan level interest rate swaps 1,834 — 1,834 — 1,834 Carrying Amount Fair Value Level 1 Level 2 Level 3 Total (In thousands) December 31, 2016 Financial assets: Cash and due from banks $ 236,423 $ 236,423 $ — $ — $ 236,423 Certificates of deposit 80,323 — 80,710 — 80,710 Securities available for sale 67,663 46,032 21,631 — 67,663 Federal Home Loan Bank stock 18,175 — — 18,175 18,175 Loans and loans held for sale, net 3,902,612 — — 3,970,896 3,970,896 Accrued interest receivable 10,381 — — 10,381 10,381 Financial liabilities: Deposits 3,475,837 — — 3,485,618 3,485,618 Borrowings 322,512 — 322,928 — 322,928 Accrued interest payable 1,384 — — 1,384 1,384 On-balance sheet derivative financial instruments: Assets: Loan level interest rate swaps 779 — 779 — 779 Liabilities: Loan level interest rate swaps 779 — 779 — 779

Pending Acquisition

Pending Acquisition	6 Months Ended
	Jun. 30, 2017
Business Combinations [Abstract]
Pending Acquisition	10. PENDING ACQUISITION On June 26, 2017, the Company announced the signing of a definitive merger agreement to acquire Meetinghouse Bancorp, Inc. (“Meetinghouse”) and for the Bank to acquire Meetinghouse Bank. The transaction has been unanimously approved by the boards of directors of both companies. Under the terms of the agreement, Meetinghouse shareholders will receive $26.00 in cash for each of their outstanding shares of Meetinghouse common stock, representing a total transaction value of approximately $17.8 million. Meetinghouse Bank has approximately $117 million in assets, $80 million in loans and $98 million in deposits as of June 30, 2017 and conducts its operations from two offices located in the Boston communities of Dorchester and Roslindale. The closing of the acquisition is anticipated to occur during the fourth quarter of 2017, subject to approval by Meetinghouse’s shareholders, the receipt of required regulatory approvals and the satisfaction of other customary closing conditions. For more information, refer to the Current Report on Form 8-K filed with the SEC on June 26, 2017.

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2017
Accounting Changes and Error Corrections [Abstract]
Change in accounting principle - Share-based compensation	Change in accounting principle — Share-based compensation In March 2016, the Financial Accounting Standards Board (the “FASB”) issued an Accounting Standards Update (“ASU”), No. 2016-09, Compensation — Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting Accounting for Income Taxes Entities will no longer record the excess tax benefits or deficiencies related to share-based compensation in additional paid-in capital. Instead, they will record excess tax benefits or deficiencies in income tax expense or benefit in the income statement as part of the provision for income taxes on a prospective basis. For interim reporting purposes the excess tax benefits or deficiencies will be recorded as discrete items in the period in which they occur. The presentation of the excess tax benefits will be presented as an operating activity in the statement of cash flows. In addition, under the new guidance, when calculating incremental shares for earnings per share, entities exclude from assumed proceeds excess tax benefits that previously would have been recorded in additional paid-in capital. The total income tax benefit recorded in the provision for income taxes for the six months ended June 30, 2017 was $358,000.
Recent Accounting Pronouncements	RECENT ACCOUNTING PRONOUNCEMENTS In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments — Overall, (Subtopic 825-10). In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments — Credit Losses (Topic 326) In January 2017, the FASB issued ASU No. 2017-04, Intangibles — Goodwill and Other (Topic 350)

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings Per Share	Basic and diluted earnings per share have been computed based on the following: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (Dollars in thousands, except per share amounts) Net income available to common stockholders $ 11,347 $ 5,907 $ 20,591 $ 13,384 Basic weighted average shares outstanding 51,003,967 51,026,985 50,976,950 51,298,334 Effect of dilutive stock options 1,418,519 1,110,490 1,497,811 1,102,364 Diluted weighted average shares outstanding $ 52,422,486 52,137,475 $ 52,474,761 52,400,698 Earnings per share: Basic $ 0.22 $ 0.12 $ 0.40 $ 0.26 Diluted $ 0.22 $ 0.11 $ 0.39 $ 0.26

Securities Available for Sale (

Securities Available for Sale (Tables)	6 Months Ended
	Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Amortized Cost and Fair Values of Securities Available for Sale	The amortized cost and fair values of securities available for sale, with gross unrealized gains and losses, follows: Amortized Gross Gross Fair (In thousands) June 30, 2017 Debt securities: Corporate bonds-financial services $ 5,001 $ — $ (1 ) $ 5,000 Municipal bonds 626 15 — 641 Residential mortgage-backed securities: Government-sponsored enterprises 4,574 288 (2 ) 4,860 Private label 76 6 — 82 Total debt securities 10,277 309 (3 ) 10,583 Marketable equity securities: Common stocks: Basic materials 4,561 323 (561 ) 4,323 Consumer products and services 11,775 1,059 (655 ) 12,179 Financial services 6,019 1,189 (25 ) 7,183 Healthcare 8,596 1,294 (2 ) 9,888 Industrials 4,245 633 (42 ) 4,836 Technology 3,043 376 (86 ) 3,333 Total common stocks 38,239 4,874 (1,371 ) 41,742 Money market mutual funds 37 — — 37 Total marketable equity securities 38,276 4,874 (1,371 ) 41,779 Total securities available for sale $ 48,553 $ 5,183 $ (1,374 ) $ 52,362 December 31, 2016 Debt securities: Corporate bonds: Financial services $ 12,989 $ 16 $ (3 ) $ 13,002 Industrials 1,000 3 — 1,003 Total corporate bonds 13,989 19 (3 ) 14,005 Municipal bonds 1,202 17 — 1,219 Residential mortgage-backed securities: Government-sponsored enterprises 5,284 325 (3 ) 5,606 Private label 779 22 — 801 Total debt securities 21,254 383 (6 ) 21,631 Marketable equity securities: Common stocks: Basic materials 6,763 901 (232 ) 7,432 Consumer products and services 13,567 1,093 (382 ) 14,278 Financial services 5,953 970 — 6,923 Healthcare 8,225 533 (456 ) 8,302 Industrials 4,181 624 (11 ) 4,794 Technology 4,081 440 (220 ) 4,301 Total common stocks 42,770 4,561 (1,301 ) 46,030 Money market mutual funds 2 — — 2 Total marketable equity securities 42,772 4,561 (1,301 ) 46,032 Total securities available for sale $ 64,026 $ 4,944 $ (1,307 ) $ 67,663
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity	The amortized cost and fair value of debt securities by contractual maturity at June 30, 2017 are as follows. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without prepayment penalties. One Year or Less After One Year After Five Years Total Amortized Fair Amortized Fair Amortized Fair Amortized Fair (In thousands) Corporate bonds-financial services $ 5,001 $ 5,000 $ — $ — $ — $ — $ 5,001 $ 5,000 Municipal bonds 626 641 — — — — 626 641 Residential mortgage-backed securities: Government-sponsored enterprises — — 1 1 4,573 4,859 4,574 4,860 Private label — — — — 76 82 76 82 Total $ 5,627 $ 5,641 $ 1 $ 1 $ 4,649 $ 4,941 $ 10,277 $ 10,583
Schedule of Information Pertaining to Securities Available for Sale	Information pertaining to securities available for sale as of June 30, 2017 and December 31, 2016, with gross unrealized losses aggregated by investment category and length of time that individual securities have been in a continuous loss position, follows: Less Than Twelve Months Twelve Months or Longer Gross Fair Gross Fair (In thousands) June 30, 2017 Debt securities: Corporate bonds-financial services $ 1 $ 5,000 $ — $ — Residential mortgage-backed securities: Government-sponsored enterprises — — 2 176 Total debt securities 1 5,000 2 176 Marketable equity securities: Common stocks: Basic materials 149 1,592 412 1,388 Consumer products and services 512 2,862 143 1,065 Financial services 25 488 — — Healthcare 2 1,119 — — Industrials 42 694 — — Technology 32 968 54 291 Total common stocks and marketable equity securities 762 7,723 609 2,744 Total temporarily impaired securities $ 763 $ 12,723 $ 611 $ 2,920 Less Than Twelve Months Twelve Months or Longer Gross Fair Gross Fair (In thousands) December 31, 2016 Debt securities: Corporate bonds-financial services $ 3 $ 5,000 $ — $ — Residential mortgage-backed securities: Government-sponsored enterprises — — 3 205 Total debt securities 3 5,000 3 205 Marketable equity securities: Common stocks: Basic materials — — 232 1,568 Consumer products and services 237 3,496 145 1,618 Healthcare 259 2,039 197 1,377 Industrials 11 450 — — Technology — — 220 1,681 Total common stocks and marketable equity securities 507 5,985 794 6,244 Total temporarily impaired securities $ 510 $ 10,985 $ 797 $ 6,449

Loans (Tables)

Loans (Tables)	6 Months Ended
	Jun. 30, 2017
Receivables [Abstract]
Summary of Loans	A summary of loans follows: June 30, 2017 December 31, 2016 Amount Percent Amount Percent (Dollars in thousands) Real estate loans: Residential real estate: One- to four-family $ 552,762 12.8 % $ 532,450 13.5 % Home equity lines of credit 42,599 1.0 42,913 1.1 Multi-family 695,602 16.2 562,948 14.3 Commercial real estate 1,927,572 44.8 1,776,601 45.1 Construction 517,471 12.0 502,753 12.8 Total real estate loans 3,736,006 86.8 3,417,665 86.8 Commercial and industrial 557,443 13.0 515,430 13.0 Consumer 10,058 0.2 9,712 0.2 Total loans 4,303,507 100.0 % 3,942,807 100.0 % Allowance for loan losses (43,229 ) (40,149 ) Net deferred loan origination fees (4,443 ) (3,990 ) Loans, net $ 4,255,835 $ 3,898,668
Allowance for Loan Losses	An analysis of the allowance for loan losses and related information follows: Three Months Ended June 30, 2017 One- to four- Multi- family Home equity of credit Commercial real estate Construction Commercial industrial Consumer Total (In thousands) Beginning balance $ 1,352 $ 4,704 $ 84 $ 19,141 $ 9,911 $ 6,480 $ 92 $ 41,764 Provision (credit) for loan losses (188 ) 844 (13 ) 1,457 (1,068 ) 421 44 1,497 Charge-offs — — — — (2 ) — (75 ) (77 ) Recoveries 3 1 — — 5 — 36 45 Ending balance $ 1,167 $ 5,549 $ 71 $ 20,598 $ 8,846 $ 6,901 $ 97 $ 43,229 Three Months Ended June 30, 2016 One- to four- Multi- Home equity Commercial real estate Construction Commercial industrial Consumer Total (In thousands) Beginning balance $ 1,385 $ 3,487 $ 96 $ 15,083 $ 7,789 $ 6,459 $ 91 $ 34,390 Provision (credit) for loan losses (65 ) 515 (4 ) 1,867 1,294 284 61 3,952 Charge-offs — — — — — — (70 ) (70 ) Recoveries — — — — 7 8 30 45 Ending balance $ 1,320 $ 4,002 $ 92 $ 16,950 $ 9,090 $ 6,751 $ 112 $ 38,317 Six Months Ended June 30, 2017 One- to four- Multi- Home equity Commercial real estate Construction Commercial industrial Consumer Total (In thousands) Beginning balance $ 1,367 $ 4,514 $ 73 $ 18,725 $ 8,931 $ 6,452 $ 87 $ 40,149 Provision (credit) for loan losses (233 ) 1,034 (2 ) 1,873 (133 ) 449 128 3,116 Charge-offs — — — — (2 ) — (166 ) (168 ) Recoveries 33 1 — — 50 — 48 132 Ending balance $ 1,167 $ 5,549 $ 71 $ 20,598 $ 8,846 $ 6,901 $ 97 $ 43,229 Six Months Ended June 30, 2016 One- to four- Multi- Home equity Commercial real estate Construction Commercial industrial Consumer Total (In thousands) Beginning balance $ 1,354 $ 3,385 $ 144 $ 14,497 $ 8,313 $ 5,620 $ 92 $ 33,405 Provision (credit) for loan losses (34 ) 617 (52 ) 2,453 763 1,167 104 5,018 Charge-offs — — — — — (44 ) (134 ) (178 ) Recoveries — — — — 14 8 50 72 Ending balance $ 1,320 $ 4,002 $ 92 $ 16,950 $ 9,090 $ 6,751 $ 112 $ 38,317 One- to four- Multi- family Home equity lines of credit Commercial real estate Construction Commercial and industrial Consumer Total (In thousands) June 30, 2017 Amount of allowance for loan losses for loans deemed to be impaired $ 51 $ 133 $ — $ 2 $ — $ — $ — $ 186 Amount of allowance for loan losses for loans not deemed to be impaired 1,116 5,416 71 20,596 8,846 6,901 97 43,043 $ 1,167 $ 5,549 $ 71 $ 20,598 $ 8,846 $ 6,901 $ 97 $ 43,229 Loans deemed to be impaired $ 1,384 $ 1,337 $ — $ 2,667 $ 173 $ 1,616 $ — $ 7,177 Loans not deemed to be impaired 551,378 694,265 42,599 1,924,905 517,298 555,827 10,058 4,296,330 $ 552,762 $ 695,602 $ 42,599 $ 1,927,572 $ 517,471 $ 557,443 $ 10,058 $ 4,303,507 December 31, 2016 Amount of allowance for loan losses for loans deemed to be impaired $ 49 $ 137 $ — $ — $ — $ — $ — $ 186 Amount of allowance for loan losses for loans not deemed to be impaired 1,318 4,377 73 18,725 8,931 6,452 87 39,963 $ 1,367 $ 4,514 $ 73 $ 18,725 $ 8,931 $ 6,452 $ 87 $ 40,149 Loans deemed to be impaired $ 1,422 $ 1,359 $ — $ 2,807 $ 988 $ 1,808 $ — $ 8,384 Loans not deemed to be impaired 531,028 561,589 42,913 1,773,794 501,765 513,622 9,712 3,934,423 $ 532,450 $ 562,948 $ 42,913 $ 1,776,601 $ 502,753 $ 515,430 $ 9,712 $ 3,942,807
Past Due and Non Accrual	The following table provides information about the Company’s past due and non-accrual loans: 30-59 60-89 90 Days Total Loans on Non-accrual (In thousands) June 30, 2017 Real estate loans: Residential real estate: One- to four-family $ 903 $ 702 $ 892 $ 2,497 $ 7,667 Home equity lines of credit 786 297 115 1,198 619 Commercial real estate 102 — 1,790 1,892 2,666 Total real estate loans 1,791 999 2,797 5,587 10,952 Commercial and industrial 5 — 529 534 529 Consumer 816 405 — 1,221 — Total $ 2,612 $ 1,404 $ 3,326 $ 7,342 $ 11,481 December 31, 2016 Real estate loans: Residential real estate: One- to four-family $ 641 $ 834 $ 2,902 $ 4,377 $ 8,487 Home equity lines of credit 707 131 672 1,510 674 Commercial real estate 105 — 1,904 2,009 2,807 Construction — — 815 815 815 Total real estate loans 1,453 965 6,293 8,711 12,783 Commercial and industrial — — 653 653 653 Consumer 679 392 — 1,071 — Total $ 2,132 $ 1,357 $ 6,946 $ 10,435 $ 13,436
Impaired Loans of Company	The following tables provide information with respect to the Company’s impaired loans: June 30, 2017 December 31, 2016 Recorded Unpaid Related Recorded Unpaid Related (In thousands) Impaired loans without a valuation allowance: One- to four-family $ 812 $ 1,263 $ 841 $ 1,281 Multi-family 66 66 74 74 Commercial real estate 2,256 2,565 2,807 3,102 Construction 173 173 988 1,083 Commercial and industrial 1,616 1,946 1,808 2,138 Total 4,923 6,013 6,518 7,678 Impaired loans with a valuation allowance: One- to four-family 572 572 $ 51 581 581 $ 49 Multi-family 1,271 1,271 133 1,285 1,285 137 Commercial real estate 411 411 2 — — — Total 2,254 2,254 186 1,866 $ 1,866 186 Total impaired loans $ 7,177 $ 8,267 $ 186 $ 8,384 $ 9,544 $ 186 At June 30, 2017, additional funds committed to be advanced in connection with impaired construction loans were immaterial. Three Months Ended June 30, 2017 2016 Average Interest Interest Average Interest Interest (In thousands) One- to four-family $ 1,550 $ 16 $ 11 $ 1,699 $ 16 $ 10 Multi-family 1,342 13 — 1,385 14 — Commercial real estate 2,762 24 24 3,937 14 14 Construction 173 2 — 14,017 9 6 Commercial and industrial 1,638 16 — 1,980 18 — Total impaired loans $ 7,465 $ 71 $ 35 $ 23,018 $ 71 $ 30 Six Months Ended June 30, 2017 2016 Average Interest Interest Average Interest Interest (In thousands) One- to four-family $ 1,559 $ 35 $ 25 $ 1,709 $ 36 $ 25 Multi-family 1,348 27 — 1,390 27 — Commercial real estate 2,781 33 33 3,805 53 53 Construction 580 4 — 14,771 17 10 Commercial and industrial 1,714 32 — 1,376 49 13 Total impaired loans $ 7,982 $ 131 $ 58 $ 23,051 $ 182 $ 101
Summary of Troubled Debt Restructurings	The following table summarizes the troubled debt restructurings (“TDRs”) at the dates indicated: June 30, December 31, (In thousands) TDRs on accrual status: One- to four-family $ 2,182 $ 2,219 Multi-family 1,337 1,359 Home equity lines of credit 17 18 Commercial real estate 9,331 9,460 Construction 173 174 Commercial and industrial 24 27 Total TDRs on accrual status 13,064 13,257 TDRs on non-accrual status: One- to four-family 1,095 1,123 Total TDRs on non-accrual status 1,095 1,123 Total TDRs $ 14,159 $ 14,380
Risk Rated Loans by Class	The following tables provide the Company’s risk-rated loans by class: June 30, 2017 December 31, 2016 Multi-family Commercial Construction Commercial Multi-family Commercial Construction Commercial (In thousands) Loans rated 1 - 6 $ 690,236 $ 1,923,617 $ 517,298 $ 501,746 $ 556,892 $ 1,771,671 $ 500,565 $ 465,979 Loans rated 7 818 1,289 — 27,888 841 2,123 — 22,820 Loans rated 8 4,548 2,666 173 27,809 5,215 2,807 2,188 26,631 Loans rated 9 — — — — — — — — Loans rated 10 — — — — — — — — Total $ 695,602 $ 1,927,572 $ 517,471 $ 557,443 $ 562,948 $ 1,776,601 $ 502,753 $ 515,430

Deposits (Tables)

Deposits (Tables)	6 Months Ended
	Jun. 30, 2017
Banking and Thrift [Abstract]
Summary of Deposit Balances, by Type	A summary of deposit balances, by type, follows: June 30, December 31, (In thousands) Demand deposits $ 457,009 $ 431,222 NOW deposits 779,208 630,413 Money market deposits 972,720 980,344 Regular savings and other deposits 321,674 305,632 Total non-certificate accounts 2,530,611 2,347,611 Term certificates less than $250,000 842,316 850,565 Term certificates $250,000 and greater 286,990 277,661 Total certificate accounts 1,129,306 1,128,226 Total deposits $ 3,659,917 $ 3,475,837
Summary of Term Certificates, by Maturity	A summary of term certificates, by maturity, follows: June 30, 2017 December 31, 2016 Maturing Amount Weighted Amount Weighted (Dollars in thousands) Within 1 year $ 632,469 1.20 % $ 539,903 1.16 % Over 1 year to 2 years 187,715 1.29 306,120 1.29 Over 2 years to 3 years 223,809 1.94 122,952 1.69 Over 3 years to 4 years 59,347 1.92 133,256 2.02 Over 4 years to 5 years 22,371 1.88 22,483 1.61 Greater than 5 years 3,595 5.50 3,512 5.50 $ 1,129,306 1.43 % $ 1,128,226 1.38 %

Borrowings (Tables)

Borrowings (Tables)	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Long-term Debt, FHLB Advances	Long-term debt consists of FHLB advances as follows: June 30, 2017 December 31, 2016 Amount Weighted Amount Weighted (Dollars in thousands) Fixed rate advances maturing: 2017 $ 17,132 1.07 % $ 89,632 1.32 % 2018 43,000 1.25 43,000 1.25 2019 3,986 1.23 4,891 1.23 2020 54,272 1.79 4,989 1.22 2021 60,000 1.42 45,000 1.46 2022 60,625 1.75 — — 2023 10,000 2.10 10,000 2.10 2026 10,000 0.69 20,000 0.59 2027 25,000 1.38 — — 2031 20,000 0.88 20,000 0.88 2032 45,000 1.03 — — 349,015 1.41 237,512 1.26 Variable rate advances maturing: 2020 — — 25,000 0.27 2021 35,000 0.58 60,000 0.31 2022 30,000 0.26 — — 2024 20,000 0.22 — — 85,000 0.38 85,000 0.29 Total advances $ 434,015 1.21 % $ 322,512 1.01 %

Other Commitments and Conting26

Other Commitments and Contingencies and Derivatives (Tables)	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Loan Commitments Outstanding	A summary of outstanding loan commitments whose contract amounts represent credit risk is as follows: June 30, December 31, (In thousands) Unadvanced portion of existing loans: Construction $ 558,108 $ 503,586 Home equity lines of credit 39,824 36,722 Other lines and letters of credit 287,990 314,225 Commitments to originate: One- to four-family 33,613 18,272 Commercial real estate 83,746 42,141 Construction 185,076 231,274 Commercial and industrial 6,300 31,463 Other loans — 350 Total loan commitments outstanding $ 1,194,657 $ 1,178,033
Summary Information Regarding the Derivatives	Summary information regarding these derivatives is presented below: June 30, 2017 December 31, 2016 Maturity Interest Rate Paid Interest Rate Received Notional Fair Notional Fair (Dollars in thousands) Customer interest rate swap 06/06/32 1 Mo. LIBOR + 200bp Fixed (4.40%) $ 66,240 $ 1,059 $ — $ — Third-party interest rate swap 06/06/32 Fixed (4.40%) 1 Mo. LIBOR + 200bp 66,240 (1,059 ) — — Customer interest rate swap 10/17/33 1 Mo. LIBOR + 175bp Fixed (4.1052%) $ 10,818 $ 828 $ 10,922 $ 839 Third-party interest rate swap 10/17/33 Fixed (4.1052%) 1 Mo. LIBOR + 175bp 10,818 (828 ) 10,922 (839 ) Customer interest rate swap 12/13/26 1 Mo. LIBOR + 205bp Fixed (3.82%) $ 2,961 $ (53 ) $ 3,036 $ (60 ) Third-party interest rate swap 12/13/26 Fixed (3.82%) 1 Mo. LIBOR + 205bp 2,961 53 3,036 60

Fair Values of Assets and Lia27

Fair Values of Assets and Liabilities (Tables)	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Assets Measured at Fair Value on a Recurring Basis	Assets measured at fair value on a recurring basis are summarized as follows. There were no liabilities measured at fair value on a recurring basis. Level 1 Level 2 Level 3 Total Fair (In thousands) June 30, 2017 Assets: Debt securities $ — $ 10,583 $ — $ 10,583 Marketable equity securities 41,779 — — 41,779 Loan level interest rate swaps — 1,834 — 1,834 Total assets $ 41,779 $ 12,417 $ — $ 54,196 Liabilities: Loan level interest rate swaps — 1,834 — 1,834 Total liabilities $ — $ 1,834 $ — $ 1,834 Level 1 Level 2 Level 3 Total Fair (In thousands) December 31, 2016 Assets: Debt securities $ — $ 21,631 $ — $ 21,631 Marketable equity securities 46,032 — — 46,032 Loan level interest rate swaps — 779 — 779 Total assets $ 46,032 $ 22,410 $ — $ 68,442 Liabilities: Loan level interest rate swaps — 779 — 779 Total liabilities $ — $ 779 $ — $ 779
Summary of Fair Values of Financial Instruments	Accordingly, the aggregate fair value amounts presented herein do not represent the underlying fair value of the Company. Carrying Amount Fair Value Level 1 Level 2 Level 3 Total (In thousands) June 30, 2017 Financial assets: Cash and due from banks $ 234,776 $ 234,776 $ — $ — $ 234,776 Certificates of deposit 85,323 — 85,646 — 85,646 Securities available for sale 52,362 41,779 10,583 — 52,362 Federal Home Loan Bank stock 22,579 — — 22,579 22,579 Loans and loans held for sale, net 4,258,092 — — 4,334,575 4,334,575 Accrued interest receivable 11,068 — — 11,068 11,068 Financial liabilities: Deposits 3,659,917 — — 3,605,013 3,605,013 Borrowings 474,015 — 475,294 — 475,294 Accrued interest payable 1,532 — — 1,532 1,532 On-balance sheet derivative financial instruments: Assets: Loan level interest rate swaps 1,834 — 1,834 — 1,834 Liabilities: Loan level interest rate swaps 1,834 — 1,834 — 1,834 Carrying Amount Fair Value Level 1 Level 2 Level 3 Total (In thousands) December 31, 2016 Financial assets: Cash and due from banks $ 236,423 $ 236,423 $ — $ — $ 236,423 Certificates of deposit 80,323 — 80,710 — 80,710 Securities available for sale 67,663 46,032 21,631 — 67,663 Federal Home Loan Bank stock 18,175 — — 18,175 18,175 Loans and loans held for sale, net 3,902,612 — — 3,970,896 3,970,896 Accrued interest receivable 10,381 — — 10,381 10,381 Financial liabilities: Deposits 3,475,837 — — 3,485,618 3,485,618 Borrowings 322,512 — 322,928 — 322,928 Accrued interest payable 1,384 — — 1,384 1,384 On-balance sheet derivative financial instruments: Assets: Loan level interest rate swaps 779 — 779 — 779 Liabilities: Loan level interest rate swaps 779 — 779 — 779

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Share in East Boston Savings Bank	100.00%		100.00%
Provision for income taxes	$ 6,237,000	$ 2,857,000	$ 10,922,000	$ 6,155,000
Accounting Standards Update 2016-09 [Member]
Schedule of Available-for-sale Securities [Line Items]
Provision for income taxes			$ 358,000

Recent Accounting Pronounceme29

Recent Accounting Pronouncements - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Deferred tax provision (benefit)	$ (340,000)	$ (540,000)
Future minimum lease payments under operating lease agreements			$ 14,993,000
Change in Accounting Method Accounted for as Change in Estimate [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized gain on equity investment	243,000
Deferred tax provision (benefit)	$ 85,000

Earnings Per Share - Computatio

Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net income available to common stockholders	$ 11,347	$ 5,907	$ 20,591	$ 13,384
Basic weighted average shares outstanding	51,003,967	51,026,985	50,976,950	51,298,334
Effect of dilutive stock options	1,418,519	1,110,490	1,497,811	1,102,364
Diluted weighted average shares outstanding	52,422,486	52,137,475	52,474,761	52,400,698
Earnings per share:
Basic	$ 0.22	$ 0.12	$ 0.40	$ 0.26
Diluted	$ 0.22	$ 0.11	$ 0.39	$ 0.26

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - shares	Jul. 31, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
2015 EIP [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of stock options granted	682,750
Award vesting percentage	20.00%
Stock options and restricted shares granted date	5 years
Stock Option [Member]
Schedule of Available-for-sale Securities [Line Items]
Anti-dilutive Options		0	248,904	0	320,829
Restricted Stock [Member] | 2015 EIP [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of shares granted	272,750

Securities Available for Sale -

Securities Available for Sale - Amortized Cost and Fair Values of Securities Available for Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total	$ 10,277	$ 21,254
Debt Securities, Gross Unrealized Gains	309	383
Debt Securities, Gross Unrealized Losses	(3)	(6)
Debt Securities, Fair Value	10,583	21,631
Marketable Equity Securities, Amortized Cost	38,276	42,772
Marketable Equity Securities, Gross Unrealized Gains	4,874	4,561
Marketable Equity Securities, Gross Unrealized Losses	(1,371)	(1,301)
Marketable Equity Securities, Fair Value	41,779	46,032
Total Securities Available for Sale, Amortized Cost	48,553	64,026
Total Securities Available for Sale, Gross Unrealized Gains	5,183	4,944
Total Securities Available for Sale, Gross Unrealized Losses	(1,374)	(1,307)
Total Securities Available for Sale, Fair Value	52,362	67,663
Corporate Bond Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total		13,989
Debt Securities, Gross Unrealized Gains		19
Debt Securities, Gross Unrealized Losses		(3)
Debt Securities, Fair Value		14,005
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total	626	1,202
Debt Securities, Gross Unrealized Gains	15	17
Debt Securities, Fair Value	641	1,219
Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable Equity Securities, Amortized Cost	37	2
Marketable Equity Securities, Fair Value	37	2
Residential Mortgage-backed Securities, Government - sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total	4,574	5,284
Debt Securities, Gross Unrealized Gains	288	325
Debt Securities, Gross Unrealized Losses	(2)	(3)
Debt Securities, Fair Value	4,860	5,606
Residential Mortgage-backed Securities, Private Label [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total	76	779
Debt Securities, Gross Unrealized Gains	6	22
Debt Securities, Fair Value	82	801
Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable Equity Securities, Amortized Cost	38,239	42,770
Marketable Equity Securities, Gross Unrealized Gains	4,874	4,561
Marketable Equity Securities, Gross Unrealized Losses	(1,371)	(1,301)
Marketable Equity Securities, Fair Value	41,742	46,030
Financial Services [Member] | Corporate Bond Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total	5,001	12,989
Debt Securities, Gross Unrealized Gains		16
Debt Securities, Gross Unrealized Losses	(1)	(3)
Debt Securities, Fair Value	5,000	13,002
Financial Services [Member] | Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable Equity Securities, Amortized Cost	6,019	5,953
Marketable Equity Securities, Gross Unrealized Gains	1,189	970
Marketable Equity Securities, Gross Unrealized Losses	(25)
Marketable Equity Securities, Fair Value	7,183	6,923
Industrials [Member] | Corporate Bond Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total		1,000
Debt Securities, Gross Unrealized Gains		3
Debt Securities, Fair Value		1,003
Industrials [Member] | Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable Equity Securities, Amortized Cost	4,245	4,181
Marketable Equity Securities, Gross Unrealized Gains	633	624
Marketable Equity Securities, Gross Unrealized Losses	(42)	(11)
Marketable Equity Securities, Fair Value	4,836	4,794
Basic Materials [Member] | Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable Equity Securities, Amortized Cost	4,561	6,763
Marketable Equity Securities, Gross Unrealized Gains	323	901
Marketable Equity Securities, Gross Unrealized Losses	(561)	(232)
Marketable Equity Securities, Fair Value	4,323	7,432
Consumer Products and Services [Member] | Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable Equity Securities, Amortized Cost	11,775	13,567
Marketable Equity Securities, Gross Unrealized Gains	1,059	1,093
Marketable Equity Securities, Gross Unrealized Losses	(655)	(382)
Marketable Equity Securities, Fair Value	12,179	14,278
Healthcare [Member] | Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable Equity Securities, Amortized Cost	8,596	8,225
Marketable Equity Securities, Gross Unrealized Gains	1,294	533
Marketable Equity Securities, Gross Unrealized Losses	(2)	(456)
Marketable Equity Securities, Fair Value	9,888	8,302
Technology [Member] | Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable Equity Securities, Amortized Cost	3,043	4,081
Marketable Equity Securities, Gross Unrealized Gains	376	440
Marketable Equity Securities, Gross Unrealized Losses	(86)	(220)
Marketable Equity Securities, Fair Value	$ 3,333	$ 4,301

Securities Available for Sale33

Securities Available for Sale - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2017USD ($)SecurityLoanSecurity	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)SecurityLoanSecurityshares	Jun. 30, 2016USD ($)	Dec. 31, 2016USD ($)
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of securities available for sale	$ 3,200,000	$ 1,100,000	$ 11,584,000	$ 5,023,000
Gross gains	808,000	324,000	2,400,000	1,200,000
Gross losses		$ 256,000	21,000	$ 1,100,000
Marketable equity securities in an unrealized loss position for less than 12 months, fair value	12,723,000		12,723,000		$ 10,985,000
Marketable equity securities in an unrealized loss position for 12 months or longer, fair value	$ 2,920,000		$ 2,920,000		$ 6,449,000
Declined percentage of equity securities unrealized losses	10.00%		10.00%
Other-than-temporarily impaired securities | shares			0
Unrealized losses on marketable equity securities, declined percentage			25.00%
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable equity securities, fair value	$ 10,500,000		$ 10,500,000
Marketable equity securities, total unrealized losses			$ 1,400,000
Number of securities in unrealized loss position | SecurityLoan	19		19
Unrealized losses with equity aggregate depreciation, percentage	11.60%		11.60%
Marketable equity securities in an unrealized loss position for less than 12 months, fair value	$ 7,700,000		$ 7,700,000
Marketable equity securities in an unrealized loss position for less than 12 months, unrealized losses			$ 762,000
Marketable equity securities in an unrealized loss position for less than 12 months, number of securities | Security	13		13
Marketable equity securities in an unrealized loss position for 12 months or longer, fair value	$ 2,700,000		$ 2,700,000
Marketable equity securities in an unrealized loss position for 12 months or longer, unrealized losses			$ 609,000
Marketable equity securities in an unrealized loss position for 12 months or longer, number of securities | Security	6		6
Equity Securities [Member] | Basic Materials [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable equity securities in an unrealized loss position for 12 months or longer, fair value	$ 1,400,000		$ 1,400,000
Marketable equity securities in an unrealized loss position for 12 months or longer, unrealized losses			$ 412,000
Marketable equity securities in an unrealized loss position for 12 months or longer, number of securities | Security	3		3
Equity Securities [Member] | Consumer Products and Services [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable equity securities in an unrealized loss position for 12 months or longer, fair value	$ 1,100,000		$ 1,100,000
Marketable equity securities in an unrealized loss position for 12 months or longer, unrealized losses			$ 143,000
Equity Securities [Member] | Healthcare [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable equity securities in an unrealized loss position for 12 months or longer, number of securities | Security	2		2
Equity Securities [Member] | Technology [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable equity securities in an unrealized loss position for 12 months or longer, fair value	$ 291,000		$ 291,000
Marketable equity securities in an unrealized loss position for 12 months or longer, unrealized losses			$ 54,000
Marketable equity securities in an unrealized loss position for 12 months or longer, number of securities | Security	1		1
Federal Reserve Bank Discount Window Borrowings [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities with amortized cost, pledged as collateral	$ 483,000		$ 483,000
Federal Home Loan Bank of Boston Borrowings [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities with amortized cost, pledged as collateral	$ 3,600,000		$ 3,600,000

Securities Available for Sale34

Securities Available for Sale - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, within 1 year	$ 5,627
Fair Value, within 1 year	5,641
Amortized Cost, over 1 year to 5 years	1
Fair Value, over 1 year to 5 years	1
Amortized Cost, over 5 years	4,649
Fair Value, over 5 years	4,941
Amortized Cost, Total	10,277	$ 21,254
Fair Value, Total	10,583	21,631
Corporate Bond Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total		13,989
Fair Value, Total		14,005
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, within 1 year	626
Fair Value, within 1 year	641
Amortized Cost, Total	626	1,202
Fair Value, Total	641	1,219
Residential Mortgage-backed Securities, Government - sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, over 1 year to 5 years	1
Fair Value, over 1 year to 5 years	1
Amortized Cost, over 5 years	4,573
Fair Value, over 5 years	4,859
Amortized Cost, Total	4,574	5,284
Fair Value, Total	4,860	5,606
Residential Mortgage-backed Securities, Private Label [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, over 5 years	76
Fair Value, over 5 years	82
Amortized Cost, Total	76	779
Fair Value, Total	82	801
Financial Services [Member] | Corporate Bond Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, within 1 year	5,001
Fair Value, within 1 year	5,000
Amortized Cost, Total	5,001	12,989
Fair Value, Total	$ 5,000	$ 13,002

Securities Available for Sale35

Securities Available for Sale - Schedule of Information Pertaining to Securities Available for Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses, less than twelve months	$ 763	$ 510
Fair value, less than twelve months	12,723	10,985
Gross unrealized losses, over twelve months	611	797
Fair value, over twelve months	2,920	6,449
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses, less than twelve months	1	3
Fair value, less than twelve months	5,000	5,000
Gross unrealized losses, over twelve months	2	3
Fair value, over twelve months	176	205
Debt Securities [Member] | Residential Mortgage-backed Securities, Government - sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses, over twelve months	2	3
Fair value, over twelve months	176	205
Marketable Equity Securities [Member] | Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses, less than twelve months	762	507
Fair value, less than twelve months	7,723	5,985
Gross unrealized losses, over twelve months	609	794
Fair value, over twelve months	2,744	6,244
Financial Services [Member] | Debt Securities [Member] | Corporate Bond Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses, less than twelve months	1	3
Fair value, less than twelve months	5,000	5,000
Financial Services [Member] | Marketable Equity Securities [Member] | Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses, less than twelve months	25
Fair value, less than twelve months	488
Basic Materials [Member] | Marketable Equity Securities [Member] | Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses, less than twelve months	149
Fair value, less than twelve months	1,592
Gross unrealized losses, over twelve months	412	232
Fair value, over twelve months	1,388	1,568
Consumer Products and Services [Member] | Marketable Equity Securities [Member] | Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses, less than twelve months	512	237
Fair value, less than twelve months	2,862	3,496
Gross unrealized losses, over twelve months	143	145
Fair value, over twelve months	1,065	1,618
Healthcare [Member] | Marketable Equity Securities [Member] | Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses, less than twelve months	2	259
Fair value, less than twelve months	1,119	2,039
Gross unrealized losses, over twelve months		197
Fair value, over twelve months		1,377
Industrials [Member] | Marketable Equity Securities [Member] | Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses, less than twelve months	42	11
Fair value, less than twelve months	694	450
Technology [Member] | Marketable Equity Securities [Member] | Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses, less than twelve months	32
Fair value, less than twelve months	968
Gross unrealized losses, over twelve months	54	220
Fair value, over twelve months	$ 291	$ 1,681

Loans - Summary of Loans (Detai

Loans - Summary of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, Amount	$ 4,303,507		$ 3,942,807
Total loans, Percent	100.00%		100.00%
Allowance for loan losses	$ (43,229)	$ (41,764)	$ (40,149)	$ (38,317)	$ (34,390)	$ (33,405)
Net deferred loan origination fees	(4,443)		(3,990)
Loans, net	4,255,835		3,898,668
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, Amount	$ 557,443		$ 515,430
Total loans, Percent	13.00%		13.00%
Allowance for loan losses	$ (6,901)	(6,480)	$ (6,452)	(6,751)	(6,459)	(5,620)
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, Amount	$ 517,471		$ 502,753
Total loans, Percent	12.00%		12.80%
Allowance for loan losses	$ (8,846)	(9,911)	$ (8,931)	(9,090)	(7,789)	(8,313)
Total Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, Amount	$ 3,736,006		$ 3,417,665
Total loans, Percent	86.80%		86.80%
Residential Portfolio Segment [Member] | Multi-Family Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, Amount	$ 695,602		$ 562,948
Total loans, Percent	16.20%		14.30%
Allowance for loan losses	$ (5,549)	(4,704)	$ (4,514)	(4,002)	(3,487)	(3,385)
Residential Portfolio Segment [Member] | One-to Four-Family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, Amount	$ 552,762		$ 532,450
Total loans, Percent	12.80%		13.50%
Allowance for loan losses	$ (1,167)	(1,352)	$ (1,367)	(1,320)	(1,385)	(1,354)
Residential Portfolio Segment [Member] | Home Equity Lines of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, Amount	$ 42,599		$ 42,913
Total loans, Percent	1.00%		1.10%
Allowance for loan losses	$ (71)	(84)	$ (73)	(92)	(96)	(144)
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, Amount	$ 1,927,572		$ 1,776,601
Total loans, Percent	44.80%		45.10%
Allowance for loan losses	$ (20,598)	(19,141)	$ (18,725)	(16,950)	(15,083)	(14,497)
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, Amount	$ 10,058		$ 9,712
Total loans, Percent	0.20%		0.20%
Allowance for loan losses	$ (97)	$ (92)	$ (87)	$ (112)	$ (91)	$ (92)

Loans - Additional Information

Loans - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2017USD ($)SecurityLoan	Jun. 30, 2016USD ($)	Dec. 31, 2016USD ($)SecurityLoan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Servicing loans for participants	$ 252,500,000		$ 210,500,000
Number of accruing loans | SecurityLoan	0		0
Loans modified as TDRs on non-accrual status, minimum period	6 months
Loans modified as TDRs qualify for return to accrual status if demonstrated performance with modified terms of loan agreement, minimum period	6 months
Allocated component included in allowance for loan losses	$ 186,000		$ 186,000
Charge-offs related to the TDRs modified	0	$ 0
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value of loan pledged	451,400,000
Multi-Family Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value of loan pledged	$ 66,300,000

Loans - Allowance for Loan Loss

Loans - Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 41,764	$ 34,390	$ 40,149	$ 33,405
Provision (credit) for loan losses	1,497	3,952	3,116	5,018
Charge-offs	(77)	(70)	(168)	(178)
Recoveries	45	45	132	72
Ending balance	43,229	38,317	43,229	38,317
Amount of allowance for loan losses for loans deemed to be impaired					$ 186	$ 186
Amount of allowance for loan losses for loans not deemed to be impaired					43,043	39,963
Total, Amount of allowance	41,764	34,390	43,229	38,317	43,229	40,149
Loans deemed to be impaired					7,177	8,384
Loans not deemed to be impaired					4,296,330	3,934,423
Total, Amount of allowance impaired					4,303,507	3,942,807
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	6,480	6,459	6,452	5,620
Provision (credit) for loan losses	421	284	449	1,167
Charge-offs				(44)
Recoveries		8		8
Ending balance	6,901	6,751	6,901	6,751
Amount of allowance for loan losses for loans not deemed to be impaired					6,901	6,452
Total, Amount of allowance	6,480	6,459	6,901	6,751	6,901	6,452
Loans deemed to be impaired					1,616	1,808
Loans not deemed to be impaired					555,827	513,622
Total, Amount of allowance impaired					557,443	515,430
Multi-Family Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Amount of allowance for loan losses for loans deemed to be impaired					133	137
One-to Four-Family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Amount of allowance for loan losses for loans deemed to be impaired					51	49
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	9,911	7,789	8,931	8,313
Provision (credit) for loan losses	(1,068)	1,294	(133)	763
Charge-offs	(2)		(2)
Recoveries	5	7	50	14
Ending balance	8,846	9,090	8,846	9,090
Amount of allowance for loan losses for loans not deemed to be impaired					8,846	8,931
Total, Amount of allowance	9,911	7,789	8,846	9,090	8,846	8,931
Loans deemed to be impaired					173	988
Loans not deemed to be impaired					517,298	501,765
Total, Amount of allowance impaired					517,471	502,753
Residential Portfolio Segment [Member] | Multi-Family Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	4,704	3,487	4,514	3,385
Provision (credit) for loan losses	844	515	1,034	617
Recoveries	1		1
Ending balance	5,549	4,002	5,549	4,002
Amount of allowance for loan losses for loans deemed to be impaired					133	137
Amount of allowance for loan losses for loans not deemed to be impaired					5,416	4,377
Total, Amount of allowance	4,704	3,487	5,549	4,002	5,549	4,514
Loans deemed to be impaired					1,337	1,359
Loans not deemed to be impaired					694,265	561,589
Total, Amount of allowance impaired					695,602	562,948
Residential Portfolio Segment [Member] | One-to Four-Family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,352	1,385	1,367	1,354
Provision (credit) for loan losses	(188)	(65)	(233)	(34)
Recoveries	3		33
Ending balance	1,167	1,320	1,167	1,320
Amount of allowance for loan losses for loans deemed to be impaired					51	49
Amount of allowance for loan losses for loans not deemed to be impaired					1,116	1,318
Total, Amount of allowance	1,352	1,385	1,167	1,320	1,167	1,367
Loans deemed to be impaired					1,384	1,422
Loans not deemed to be impaired					551,378	531,028
Total, Amount of allowance impaired					552,762	532,450
Residential Portfolio Segment [Member] | Home Equity Lines of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	84	96	73	144
Provision (credit) for loan losses	(13)	(4)	(2)	(52)
Ending balance	71	92	71	92
Amount of allowance for loan losses for loans not deemed to be impaired					71	73
Total, Amount of allowance	84	96	71	92	71	73
Loans not deemed to be impaired					42,599	42,913
Total, Amount of allowance impaired					42,599	42,913
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	19,141	15,083	18,725	14,497
Provision (credit) for loan losses	1,457	1,867	1,873	2,453
Ending balance	20,598	16,950	20,598	16,950
Amount of allowance for loan losses for loans deemed to be impaired					2
Amount of allowance for loan losses for loans not deemed to be impaired					20,596	18,725
Total, Amount of allowance	19,141	15,083	20,598	16,950	20,598	18,725
Loans deemed to be impaired					2,667	2,807
Loans not deemed to be impaired					1,924,905	1,773,794
Total, Amount of allowance impaired					1,927,572	1,776,601
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	92	91	87	92
Provision (credit) for loan losses	44	61	128	104
Charge-offs	(75)	(70)	(166)	(134)
Recoveries	36	30	48	50
Ending balance	97	112	97	112
Amount of allowance for loan losses for loans not deemed to be impaired					97	87
Total, Amount of allowance	$ 92	$ 91	$ 97	$ 112	97	87
Loans not deemed to be impaired					10,058	9,712
Total, Amount of allowance impaired					$ 10,058	$ 9,712

Loans - Past Due and Non Accrua

Loans - Past Due and Non Accrual (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	$ 7,342	$ 10,435
Loans on Non-accrual	11,481	13,436
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	534	653
Loans on Non-accrual	529	653
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	5,587	8,711
Loans on Non-accrual	10,952	12,783
One-to Four-Family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	2,497	4,377
Loans on Non-accrual	7,667	8,487
Home Equity Lines of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	1,198	1,510
Loans on Non-accrual	619	674
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	1,892	2,009
Loans on Non-accrual	2,666	2,807
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due		815
Loans on Non-accrual		815
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	1,221	1,071
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	2,612	2,132
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	5
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	1,791	1,453
Financing Receivables, 30 to 59 Days Past Due [Member] | One-to Four-Family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	903	641
Financing Receivables, 30 to 59 Days Past Due [Member] | Home Equity Lines of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	786	707
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	102	105
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	816	679
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	1,404	1,357
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	999	965
Financing Receivables, 60 to 89 Days Past Due [Member] | One-to Four-Family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	702	834
Financing Receivables, 60 to 89 Days Past Due [Member] | Home Equity Lines of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	297	131
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	405	392
Financing Receivables, 90 Days or Greater Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	3,326	6,946
Financing Receivables, 90 Days or Greater Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	529	653
Financing Receivables, 90 Days or Greater Past Due [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	2,797	6,293
Financing Receivables, 90 Days or Greater Past Due [Member] | One-to Four-Family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	892	2,902
Financing Receivables, 90 Days or Greater Past Due [Member] | Home Equity Lines of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	115	672
Financing Receivables, 90 Days or Greater Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	$ 1,790	1,904
Financing Receivables, 90 Days or Greater Past Due [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due		$ 815

Loans - Impaired Loans of Compa

Loans - Impaired Loans of Company (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Recorded Investment, Total	$ 7,177		$ 7,177		$ 8,384
Impaired Loans Without Valuation Allowance, Recorded Investment	4,923		4,923		6,518
Impaired Loans With Valuation Allowance, Recorded Investment	2,254		2,254		1,866
Unpaid Principal Balance, Total	8,267		8,267		9,544
Impaired Loans Without Valuation Allowance, Unpaid Principal Balance	6,013		6,013		7,678
Impaired Loans With Valuation Allowance, Unpaid Principal Balance	2,254		2,254		1,866
Impaired Loans With Valuation Allowance, Related Allowance	186		186		186
Average Recorded Investment	7,465	$ 23,018	7,982	$ 23,051
Interest Income Recognized	71	71	131	182
Interest Income Recognized on Cash Basis	35	30	58	101
Multi-Family Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans Without Valuation Allowance, Recorded Investment	66		66		74
Impaired Loans With Valuation Allowance, Recorded Investment	1,271		1,271		1,285
Impaired Loans Without Valuation Allowance, Unpaid Principal Balance	66		66		74
Impaired Loans With Valuation Allowance, Unpaid Principal Balance	1,271		1,271		1,285
Impaired Loans With Valuation Allowance, Related Allowance	133		133		137
Average Recorded Investment	1,342	1,385	1,348	1,390
Interest Income Recognized	13	14	27	27
One-to Four-Family [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans Without Valuation Allowance, Recorded Investment	812		812		841
Impaired Loans With Valuation Allowance, Recorded Investment	572		572		581
Impaired Loans Without Valuation Allowance, Unpaid Principal Balance	1,263		1,263		1,281
Impaired Loans With Valuation Allowance, Unpaid Principal Balance	572		572		581
Impaired Loans With Valuation Allowance, Related Allowance	51		51		49
Average Recorded Investment	1,550	1,699	1,559	1,709
Interest Income Recognized	16	16	35	36
Interest Income Recognized on Cash Basis	11	10	25	25
Construction [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, Total	173		173		988
Impaired Loans Without Valuation Allowance, Recorded Investment	173		173		988
Impaired Loans Without Valuation Allowance, Unpaid Principal Balance	173		173		1,083
Average Recorded Investment	173	14,017	580	14,771
Interest Income Recognized	2	9	4	17
Interest Income Recognized on Cash Basis		6		10
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, Total	1,616		1,616		1,808
Impaired Loans Without Valuation Allowance, Recorded Investment	1,616		1,616		1,808
Impaired Loans Without Valuation Allowance, Unpaid Principal Balance	1,946		1,946		2,138
Average Recorded Investment	1,638	1,980	1,714	1,376
Interest Income Recognized	16	18	32	49
Interest Income Recognized on Cash Basis				13
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, Total	2,667		2,667		2,807
Impaired Loans Without Valuation Allowance, Recorded Investment	2,256		2,256		2,807
Impaired Loans With Valuation Allowance, Recorded Investment	411		411
Impaired Loans Without Valuation Allowance, Unpaid Principal Balance	2,565		2,565		$ 3,102
Impaired Loans With Valuation Allowance, Unpaid Principal Balance	411		411
Impaired Loans With Valuation Allowance, Related Allowance	2		2
Average Recorded Investment	2,762	3,937	2,781	3,805
Interest Income Recognized	24	14	33	53
Interest Income Recognized on Cash Basis	$ 24	$ 14	$ 33	$ 53

Loans - Summary of Troubled Deb

Loans - Summary of Troubled Debt Restructurings (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Modifications [Line Items]
Total TDRs on accrual status	$ 13,064	$ 13,257
Total TDRs on non-accrual status	1,095	1,123
Total TDRs	14,159	14,380
Multi-Family Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Total TDRs on accrual status	1,337	1,359
One-to Four-Family [Member]
Financing Receivable, Modifications [Line Items]
Total TDRs on accrual status	2,182	2,219
Total TDRs on non-accrual status	1,095	1,123
Home Equity Lines of Credit [Member]
Financing Receivable, Modifications [Line Items]
Total TDRs on accrual status	17	18
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Total TDRs on accrual status	9,331	9,460
Construction [Member]
Financing Receivable, Modifications [Line Items]
Total TDRs on accrual status	173	174
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Total TDRs on accrual status	$ 24	$ 27

Loans - Risk Rated Loans by Cla

Loans - Risk Rated Loans by Class (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Multi-Family Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable Credit Quality Rating	$ 695,602	$ 562,948
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable Credit Quality Rating	1,927,572	1,776,601
Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable Credit Quality Rating	517,471	502,753
Loans Rated 1-6 [Member] | Multi-Family Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable Credit Quality Rating	690,236	556,892
Loans Rated 1-6 [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable Credit Quality Rating	1,923,617	1,771,671
Loans Rated 1-6 [Member] | Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable Credit Quality Rating	517,298	500,565
Loans Rated 7 [Member] | Multi-Family Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable Credit Quality Rating	818	841
Loans Rated 7 [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable Credit Quality Rating	1,289	2,123
Loans Rated 8 [Member] | Multi-Family Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable Credit Quality Rating	4,548	5,215
Loans Rated 8 [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable Credit Quality Rating	2,666	2,807
Loans Rated 8 [Member] | Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable Credit Quality Rating	173	2,188
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable Credit Quality Rating	557,443	515,430
Commercial and Industrial [Member] | Loans Rated 1-6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable Credit Quality Rating	501,746	465,979
Commercial and Industrial [Member] | Loans Rated 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable Credit Quality Rating	27,888	22,820
Commercial and Industrial [Member] | Loans Rated 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable Credit Quality Rating	$ 27,809	$ 26,631

Deposits - Summary of Deposit B

Deposits - Summary of Deposit Balances, by Type (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Banking and Thrift [Abstract]
Demand deposits	$ 457,009	$ 431,222
NOW deposits	779,208	630,413
Money market deposits	972,720	980,344
Regular savings and other deposits	321,674	305,632
Total non-certificate accounts	2,530,611	2,347,611
Term certificates less than $250,000	842,316	850,565
Term certificates $250,000 and greater	286,990	277,661
Total certificate accounts	1,129,306	1,128,226
Total deposits	$ 3,659,917	$ 3,475,837

Deposits - Summary of Term Cert

Deposits - Summary of Term Certificates, by Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Banking and Thrift [Abstract]
Within 1 year, Amount	$ 632,469	$ 539,903
Over 1 year to 2 years, Amount	187,715	306,120
Over 2 years to 3 years, Amount	223,809	122,952
Over 3 years to 4 years, Amount	59,347	133,256
Over 4 years to 5 years, Amount	22,371	22,483
Greater than 5 years, Amount	3,595	3,512
Total certificate accounts	$ 1,129,306	$ 1,128,226
Within 1 year, Weighted Average Rate	1.20%	1.16%
Over 1 year to 2 years, Weighted Average Rate	1.29%	1.29%
Over 2 year to 3 years, Weighted Average Rate	1.94%	1.69%
Over 3 year to 4 years, Weighted Average Rate	1.92%	2.02%
Over 4 years to 5 years, Weighted Average Rate	1.88%	1.61%
Greater than 5 Years, Weighted Average Rate	5.50%	5.50%
Weighted average rate on term certificates	1.43%	1.38%

Deposits - Additional Informati

Deposits - Additional Information (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Banking and Thrift [Abstract]
Brokered certificate of deposit included in term certificates	$ 152.9		$ 158.5
Weighted average rate of deposit included in term certificates	1.49%		1.33%
Brokered NOW deposits	$ 436.6	$ 296.3

Borrowings - Additional Informa

Borrowings - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Debt Disclosure [Line Items]
Available line of credit with the FHLB	$ 9,400,000
Prepaid amount of FHLB	$ 40,000,000
Weighted average interest rate	1.30%
Short-term borrowings	$ 40,000,000	$ 0
Amounts drawn on the line of credit	0	0
Available borrowings under Federal Reserve Bank discount window	483,000
Outstanding borrowings under Federal Reserve Bank discount window	0	$ 0
Amount of advances callable by the FHLB prior to maturity	290,000,000
Multi-Family Residential Real Estate [Member]
Debt Disclosure [Line Items]
Carrying value of commercial real estate loans pledged	66,300,000
LIBOR Less 60 Basis Points [Member]
Debt Disclosure [Line Items]
FHLB advances during the first year	$ 35,000,000
LIBOR, Basis points	0.60%
Interest rate, Description	3-Month London Interbank Offered Rate ("LIBOR"), less 60 basis points
Interest rate, Term	Variable
Period of LIBOR measurement	3 months
LIBOR Less 100 Basis Points [Member]
Debt Disclosure [Line Items]
FHLB advances during the first year	$ 50,000,000
LIBOR, Basis points	1.00%
Interest rate, Description	3-Month LIBOR, less 100 basis points
Interest rate, Term	Variable
Period of LIBOR measurement	3 months
Commercial Real Estate Portfolio Segment [Member]
Debt Disclosure [Line Items]
Carrying value of commercial real estate loans pledged	$ 451,400,000

Borrowings - Long-term Debt, FH

Borrowings - Long-term Debt, FHLB Advances (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total advances	$ 434,015	$ 322,512
Weighted Average Rate	1.30%
Weighted Average [Member]
Debt Instrument [Line Items]
Weighted Average Rate	1.21%	1.01%
Fixed Interest Rate [Member]
Debt Instrument [Line Items]
2,017	$ 17,132	$ 89,632
2,018	43,000	43,000
2,019	3,986	4,891
2,020	54,272	4,989
2,021	60,000	45,000
2,022	60,625
2,023	10,000	10,000
2,026	10,000	20,000
2,027	25,000
2,031	20,000	20,000
2,032	45,000
Total advances	$ 349,015	$ 237,512
Weighted Average Rate, 2017	1.07%	1.32%
Weighted Average Rate, 2018	1.25%	1.25%
Weighted Average Rate, 2019	1.23%	1.23%
Weighted Average Rate, 2020	1.79%	1.22%
Weighted Average Rate, 2021	1.42%	1.46%
Weighted Average Rate, 2022	1.75%
Weighted Average Rate, 2023	2.10%	2.10%
Weighted Average Rate, 2026	0.69%	0.59%
Weighted Average Rate, 2027	1.38%
Weighted Average Rate, 2031	0.88%	0.88%
Weighted Average Rate, 2032	1.03%
Fixed Interest Rate [Member] | Weighted Average [Member]
Debt Instrument [Line Items]
Weighted Average Rate	1.41%	1.26%
Variable Interest Rate [Member]
Debt Instrument [Line Items]
2,020		$ 25,000
2,021	$ 35,000	60,000
2,022	30,000
2,024	20,000
Total advances	$ 85,000	$ 85,000
Weighted Average Rate, 2020		0.27%
Weighted Average Rate, 2021	0.58%	0.31%
Weighted Average Rate, 2022	0.26%
Weighted Average Rate, 2024	0.22%
Variable Interest Rate [Member] | Weighted Average [Member]
Debt Instrument [Line Items]
Weighted Average Rate	0.38%	0.29%

Other Commitments and Conting48

Other Commitments and Contingencies and Derivatives - Loan Commitments Outstanding (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Total loan commitments outstanding	$ 1,194,657	$ 1,178,033
Construction [Member] | Unadvanced Portion of Existing Loans [Member]
Loss Contingencies [Line Items]
Total loan commitments outstanding	558,108	503,586
Construction [Member] | Unfunded Loan Commitment [Member]
Loss Contingencies [Line Items]
Total loan commitments outstanding	185,076	231,274
Home Equity Lines of Credit [Member] | Unadvanced Portion of Existing Loans [Member]
Loss Contingencies [Line Items]
Total loan commitments outstanding	39,824	36,722
One-to Four-Family [Member] | Unfunded Loan Commitment [Member]
Loss Contingencies [Line Items]
Total loan commitments outstanding	33,613	18,272
Commercial Real Estate Portfolio Segment [Member] | Unfunded Loan Commitment [Member]
Loss Contingencies [Line Items]
Total loan commitments outstanding	83,746	42,141
Unallocated Financing Receivables [Member] | Unfunded Loan Commitment [Member]
Loss Contingencies [Line Items]
Total loan commitments outstanding		350
Other Lines and Letters of Credit [Member] | Unadvanced Portion of Existing Loans [Member]
Loss Contingencies [Line Items]
Total loan commitments outstanding	287,990	314,225
Commercial and Industrial [Member] | Unfunded Loan Commitment [Member]
Loss Contingencies [Line Items]
Total loan commitments outstanding	$ 6,300	$ 31,463

Other Commitments and Conting49

Other Commitments and Contingencies and Derivatives - Additional Information (Detail) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Cash pledged for collateral interest rate swap	$ 3,200,000	$ 1,800,000
Core Data Processing Provider [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other outstanding commitments	$ 19,500,000

Other Commitments and Conting50

Other Commitments and Contingencies and Derivatives - Summary Information Regarding the Derivatives (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Customer Interest Rate Swap Maturing on 06/06/32 [Member]
Loss Contingencies [Line Items]
Notional amount	$ 66,240,000
Fair value	$ 1,059,000
Maturity	Jun. 6, 2032
Interest rate paid	1 Mo. LIBOR + 200bp
Interest rate received	Fixed (4.40%)
Third Party Interest Rate Swap Maturing on 06/06/32 [Member]
Loss Contingencies [Line Items]
Notional amount	$ 66,240,000
Fair value	$ (1,059,000)
Maturity	Jun. 6, 2032
Interest rate paid	Fixed (4.40%)
Interest rate received	1 Mo. LIBOR + 200bp
Customer Interest Rate Swap Maturing on 10/17/33 [Member]
Loss Contingencies [Line Items]
Notional amount	$ 10,818,000	$ 10,922,000
Fair value	$ 828,000	839,000
Maturity	Oct. 17, 2033
Interest rate paid	1 Mo. LIBOR + 175bp
Interest rate received	Fixed (4.1052%)
Third Party Interest Rate Swap Maturing on 10/17/33 [Member]
Loss Contingencies [Line Items]
Notional amount	$ 10,818,000	10,922,000
Fair value	$ (828,000)	(839,000)
Maturity	Oct. 17, 2033
Interest rate paid	Fixed (4.1052%)
Interest rate received	1 Mo. LIBOR + 175bp
Customer Interest Rate Swap Maturing on 12/13/26 [Member]
Loss Contingencies [Line Items]
Notional amount	$ 2,961,000	3,036,000
Fair value	$ (53,000)	(60,000)
Maturity	Dec. 13, 2026
Interest rate paid	1 Mo. LIBOR + 205bp
Interest rate received	Fixed (3.82%)
Third Party Interest Rate Swap Maturing on 12/13/26 [Member]
Loss Contingencies [Line Items]
Notional amount	$ 2,961,000	3,036,000
Fair value	$ 53,000	$ 60,000
Maturity	Dec. 13, 2026
Interest rate paid	Fixed (3.82%)
Interest rate received	1 Mo. LIBOR + 205bp

Fair Values of Assets and Lia51

Fair Values of Assets and Liabilities - Assets Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	$ 10,583	$ 21,631
Marketable equity securities	41,779	46,032
Total assets	54,196	68,442
Total liabilities	1,834	779
Loan Level Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	1,834	779
Total liabilities	1,834	779
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable equity securities	41,779	46,032
Total assets	41,779	46,032
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	10,583	21,631
Total assets	12,417	22,410
Total liabilities	1,834	779
Fair Value, Inputs, Level 2 [Member] | Loan Level Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	1,834	779
Total liabilities	$ 1,834	$ 779

Fair Values of Assets and Lia52

Fair Values of Assets and Liabilities - Additional Information (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans measured at fair value	$ 3.7	$ 4.9

Fair Values of Assets and Lia53

Fair Values of Assets and Liabilities - Summary of Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financial assets:
Cash and due from banks, fair value	$ 234,776	$ 236,423
Cash and due from banks, carrying amount	234,776	236,423
Certificates of deposit, fair value	85,646	80,710
Certificates of deposit, carrying amount	85,323	80,323
Securities available for sale, carrying amount	52,362	67,663
Federal Home Loan Bank stock, carrying amount	22,579	18,175
Federal Home Loan Bank stock, fair value	22,579	18,175
Loans and loans held for sale, net, carrying amount	4,258,092	3,902,612
Loans and loans held for sale, net, fair value	4,334,575	3,970,896
Accrued interest receivable, carrying amount	11,068	10,381
Accrued interest receivable, fair value	11,068	10,381
Financial liabilities:
Deposits, fair value	3,605,013	3,485,618
Deposits, carrying amount	3,659,917	3,475,837
Borrowings, fair value	475,294	322,928
Borrowings, carrying amount	474,015	322,512
Accrued interest payable, fair value	1,532	1,384
Accrued interest payable, carrying amount	1,532	1,384
Reported Value Measurement [Member]
Financial assets:
Securities available for sale, carrying amount	52,362	67,663
Derivative Loan Commitments [Member]
Financial liabilities:
Derivative Financial Assets, carrying amount	10	20
Derivative Financial Liability, carrying amount	9	26
Forward Loan Sale Commitments [Member]
Financial liabilities:
Derivative Financial Assets, carrying amount	17	169
Derivative Financial Liability, carrying amount	2	15
Interest Rate Swaps Asset [Member]
Financial liabilities:
Derivative Financial Assets, fair value	1,834	779
Derivative Financial Assets, carrying amount	1,834	779
Interest Rate Swaps Liability [Member]
Financial liabilities:
Derivative Financial Liability, fair value	1,834	779
Derivative Financial Liability, carrying amount	1,834	779
Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and due from banks, fair value	234,776	236,423
Securities available for sale, carrying amount	41,779	46,032
Fair Value, Inputs, Level 2 [Member]
Financial assets:
Certificates of deposit, fair value	85,646	80,710
Securities available for sale, carrying amount	10,583	21,631
Financial liabilities:
Borrowings, fair value	475,294	322,928
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swaps Asset [Member]
Financial liabilities:
Derivative Financial Assets, fair value	1,834	779
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swaps Liability [Member]
Financial liabilities:
Derivative Financial Liability, fair value	1,834	779
Fair Value, Inputs, Level 3 [Member]
Financial assets:
Federal Home Loan Bank stock, fair value	22,579	18,175
Loans and loans held for sale, net, fair value	4,334,575	3,970,896
Accrued interest receivable, fair value	11,068	10,381
Financial liabilities:
Deposits, fair value	3,605,013	3,485,618
Accrued interest payable, fair value	$ 1,532	$ 1,384

Pending Acquisition - Additiona

Pending Acquisition - Additional Information (Detail) - Meetinghouse Bancorp, Inc. [Member] $ / shares in Units, $ in Millions	Jun. 26, 2017USD ($)$ / shares	Jun. 30, 2017USD ($)Office
Business Acquisition [Line Items]
Business acquisition, agreement date		Jun. 26, 2017
Business acquisition, share price | $ / shares	$ 26
Total transaction value	$ 17.8
Assets		$ 117
Loans		80
Deposits		$ 98
Number of offices operated | Office		2
Business acquisition, closing date		Dec. 31, 2017