Westbury Bancorp (WBBW) 10-Q 29 Jul 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Jun. 30, 2016	Jul. 29, 2016
Document and Entity Information
Entity Registrant Name	Westbury Bancorp, Inc.
Entity Central Index Key	1,553,326
Document Type	10-Q
Document Period End Date	Jun. 30, 2016
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Entity Current Reporting Status	Yes
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		4,098,448
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q3

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Assets
Cash and due from banks	$ 9,828	$ 9,963
Interest-earning deposits	7,989	6,525
Cash and cash equivalents	17,817	16,488
Securities available-for-sale	87,254	80,286
Securities held to maturity, at amortized cost ($2,499 and $2,490 fair value at March 31, 2016 and September 30, 2015, respectively)	2,293	2,459
Loans held for sale, at lower of cost or fair value	2,187	431
Loans, net of allowance for loan losses of $4,863 and $4,598 at March 31, 2016 and September 30, 2015, respectively	519,332	493,425
Federal Home Loan Bank stock, at cost	1,301	3,350
Foreclosed real estate	0	283
Real estate held for investment	1,814	2,047
Real estate held for sale	717	882
Office properties and equipment, net	13,468	13,867
Cash surrender value of bank-owned life insurance	14,129	13,167
Mortgage servicing rights	883	1,210
Deferred tax asset	5,541	7,546
Other assets	4,042	3,488
Total assets	670,778	638,929
Liabilities
Deposits	563,515	531,020
Short-term advances from Federal Home Loan Bank	0	18,000
Long-term advances from Federal Home Loan Bank	20,000	0
Advance payments by borrowers for property taxes and insurance	3,637	5,382
Other liabilities	4,544	5,715
Total liabilities	591,696	560,117
Stockholders’ Equity
Preferred stock $0.01 par value, 50,000,000 shares authorized; none issued or outstanding	0	0
Common stock $0.01 par value, 100,000,000 shares authorized; 5,347,412 and 5,341,114 shares issued at March 31, 2016 and September 30, 2015, respectively	54	53
Additional paid-in capital	51,068	50,145
Retained earnings	51,532	48,714
Unearned Employee Stock Ownership Plan (ESOP) shares	(3,291)	(3,548)
Accumulated other comprehensive gain (loss)	965	352
Less common stock repurchased, 1,182,741 and 1,012,109 shares at cost, at March 31, 2016 and September 30, 2015, respectively	(21,246)	(16,904)
Total stockholders’ equity	79,082	78,812
Total liabilities and stockholders’ equity	$ 670,778	$ 638,929

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Statement of Financial Position [Abstract]
Securities held to maturity, fair value	$ 2,393	$ 2,490
Allowance for loan losses	$ 5,062	$ 4,598
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	5,347,571	5,341,114
Treasury stock, shares	1,249,124	1,012,109

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Interest and dividend income:
Loans	$ 5,266	$ 4,855	$ 15,549	$ 13,999
Investments - nontaxable	30	15	53	47
Investments - taxable	433	398	1,364	1,194
Interest bearing deposits	34	17	97	45
Total interest and dividend income	5,763	5,285	17,063	15,285
Interest expense:
Deposits	605	509	1,742	1,380
Short-term advances from the Federal Home Loan Bank	13	9	36	27
Long-term advances from the Federal Home Loan Bank	59	0	130	0
Total interest expense	677	518	1,908	1,407
Net interest income before provision for loan losses	5,086	4,767	15,155	13,878
Provision for loan losses	250	150	525	800
Net interest income after provision for loan losses	4,836	4,617	14,630	13,078
Noninterest income:
Service fees on deposit accounts	975	1,081	3,000	3,236
Gain on sales of loans, net	187	79	449	322
Servicing fee income, net of amortization and impairment	(90)	69	(36)	112
Insurance and securities sales commissions	45	78	177	234
Gain on sales of securities	210	17	221	90
Gain on sales of branches and other assets	0	1	1	7
Increase in cash surrender value of bank-owned life insurance	105	97	325	327
Rental income from real estate operations	102	146	328	422
Other income	25	38	150	141
Total noninterest income	1,559	1,606	4,615	4,891
Noninterest expenses:
Salaries and employee benefits	2,489	2,427	7,299	7,247
Commissions	56	49	152	175
Occupancy	305	326	924	1,024
Furniture and equipment	123	124	366	352
Data processing	781	831	2,300	2,404
Advertising	57	45	157	149
Real estate held for investment	94	103	297	326
Net loss from operations and sale of foreclosed real estate	8	(316)	(5)	(495)
FDIC insurance premiums	102	104	309	316
Valuation loss on real estate held for sale	90	0	137	0
Branch realignment	0	250	0	250
Buyout of service contract	0	350	0	350
Other expenses	990	1,140	2,870	3,304
Total noninterest expenses	5,079	6,065	14,816	16,392
Income before income tax expense	1,316	158	4,429	1,577
Income tax expense	410	48	1,611	536
Net income	$ 906	$ 110	$ 2,818	$ 1,041
Earnings per share:
Basic (in dollars per share)	$ 0.25	$ 0.03	$ 0.76	$ 0.25
Diluted (in dollars per share)	$ 0.25	$ 0.03	$ 0.75	$ 0.25

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 906	$ 110	$ 2,818	$ 1,041
Other comprehensive income, before tax:
Unrealized gains on available-for-sale securities	624	(846)	1,229	29
Reclassification adjustment for realized gains included in net income	(210)	(17)	(221)	(90)
Other comprehensive income, before tax	414	(863)	1,008	(61)
Income tax expense related to items of other comprehensive income	(163)	338	(395)	23
Other comprehensive income, net of tax	251	(525)	613	(38)
Comprehensive income	$ 1,157	$ (415)	$ 3,431	$ 1,003

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid In Capital	Retained Earnings	Unearned ESOP Shares	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balance at Sep. 30, 2014	$ 86,487	$ 0	$ 53	$ 49,164	$ 45,190	$ (3,754)	$ (46)	$ (4,120)
Increase (Decrease) in Stockholders' Equity
Net income	1,041	0			1,041
Other comprehensive income (loss), net of tax	(38)						(38)
Exercise of 4,298 stock options	0
Repurchase of 27,994 and 55061 shares, respectively, of common stock	(11,379)							(11,379)
Stock based compensation expense	602			602
Allocation,or commitment to be allocated, of 10,284 shares by ESOP	288			133		155
Balance at Jun. 30, 2015	77,001	0	53	49,899	46,231	(3,599)	(84)	(15,499)
Balance at Sep. 30, 2015	78,812	0	$ 53	50,145	48,714	(3,548)	352	(16,904)
Increase (Decrease) in Stockholders' Equity
Net income	2,818	0			2,818
Other comprehensive income (loss), net of tax	613						613
Exercise of 4,298 stock options	68			67
Repurchase of 27,994 and 55061 shares, respectively, of common stock	(4,342)							(4,342)
Shares exercised			1
Stock based compensation expense	628			628
Allocation,or commitment to be allocated, of 10,284 shares by ESOP	485	0		228		257
Balance at Jun. 30, 2016	$ 79,082	$ 0	$ 54	$ 51,068	$ 51,532	$ (3,291)	$ 965	$ (21,246)

Consolidated Statements of Cha7

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - shares	9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Statement of Stockholders' Equity [Abstract]
Number of shares allocated by ESOP	25,712	15,427
Exercised (shares)	4,457
Number of shares repurchased during period	237,015	661,730

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash Flows From Operating Activities
Net income	$ 2,818	$ 1,041
Adjustments to reconcile net income to net cash used in operating activities:
Provision for loan losses	525	800
Depreciation and amortization	573	486
Depreciation on real estate held for investment	66	99
Net amortization of securities premiums and discounts	334	379
Amortization and impairment of mortgage servicing rights	327	267
Capitalization of mortgage servicing rights	0	(2)
Gain on sales of available-for-sale securities	(221)	(90)
Gain on sales of branches and other assets	(1)	(7)
Write-down of real estate held-for-sale	137	0
(Gain) loss on sale of foreclosed real estate	(28)	18
Write-down of foreclosed real estate	26	321
Loans originated for sale	(29,678)	(20,366)
Proceeds from sale of loans	28,371	19,510
Gain on sale of loans, net	(449)	(322)
ESOP compensation expense	485	288
Stock based compensation expense	628	602
Deferred income taxes	1,610	435
Increase in cash surrender value of life insurance	(325)	(327)
Net change in:
Other assets	(553)	(459)
Other liabilities and advance payments by borrowers for property taxes and insurance	(2,915)	(1,882)
Net cash used in operating activities	1,730	791
Cash Flows From Investing Activities
Purchases of securities available-for-sale	(39,340)	(21,395)
Proceeds from sales of securities available-for-sale	24,222	23,208
Proceeds from maturities, prepayments, and calls of securities available-for-sale	9,045	8,733
Purchases of securities held to maturity	0	(3,025)
Proceeds from maturities, prepayments, and calls of securities held to maturity	166	566
Purchases of real estate held for investment	18	19
Proceeds from sale of real estate held for investment	185	0
Purchase of FHLB stock	0	(680)
Redemption of FHLB stock	2,049	0
Net increase in loans	(26,503)	(70,938)
Purchase of bank-owned life insurance	637	0
Purchases of office properties and equipment	(174)	(729)
Proceeds from sales of real estate held-for-sale	27	0
Proceeds from sales of foreclosed real estate	356	1,120
Net cash used in investing activities	(30,622)	(63,159)
Cash Flows From Financing Activities
Net increase in deposits	32,495	67,103
Proceeds from long-term Federal Home Loan Bank advances	20,000	0
Increase in short-term Federal Home Loan Bank advances	(18,000)	5,000
Exercise of 4,298 stock options	68	0
Repurchase of common stock	(4,342)	(11,379)
Net cash provided by financing activities	30,221	60,724
Net decrease in cash and cash equivalents	1,329	(1,644)
Cash and cash equivalents at beginning	16,488	17,608
Cash and cash equivalents at end	17,817	15,964
Supplemental Disclosures of Cash Flow Information
Interest paid (including amounts credited to deposits)	1,908	1,405
Supplemental Schedules of Non-cash Investing Activities
Loans receivable transferred to foreclosed real estate	$ 71	$ 515

Basis of Presentation

Basis of Presentation	9 Months Ended
	Jun. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated financial statements of Westbury Bancorp, Inc. and its wholly-owned subsidiary, Westbury Bank, (the "Bank", and collectively, the “Company”) have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 8-03 of Regulation S-X. Accordingly, certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Estimates used in the preparation of the financial statements are based on various factors including the current interest rate environment and the general strength of the local economy. Changes in the overall interest rate environment can significantly affect the Company’s net interest income and the value of its recorded assets and liabilities. Actual results could differ from those estimates used in the preparation of the financial statements. Certain prior period amounts have been reclassified to conform to current period presentation. These reclassifications did not result in any changes to previously reported net income or stockholders’ equity. In the opinion of management, the accompanying unaudited financial statements contain all adjustments (consisting only of normal recurring accruals) necessary to present fairly the Company’s financial condition as of June 30, 2016 and September 30, 2015 and the results of operations and cash flows for the interim periods ended June 30, 2016 and 2015. All interim amounts are unaudited, and the results of operations for the interim periods herein are not necessarily indicative of the results of operations to be expected for the year. These financial statements should be read in conjunction with the Company’s audited financial statements and notes thereto for the year ended September 30, 2015 filed with the U.S. Securities and Exchange Commission as part of Westbury Bancorp, Inc.’s Annual Report on Form 10-K for the year ended September 30, 2015. The Jumpstart Our Business Startups Act (the "JOBS Act"), which was signed into law on April 5, 2012, has made numerous changes to the federal securities laws to facilitate access to capital markets. Under the JOBS Act, a company with total annual gross revenues of less than $1.0 billion during its most recently completed fiscal year qualifies as an “emerging growth company.” The Company qualifies as an “emerging growth company” and believes that it will continue to qualify as an “emerging growth company” until five years from the completion of the Company's initial public stock offering in April 2013. As an “emerging growth company,” the Company has elected to use the extended transition period to delay adoption of new or revised accounting pronouncements applicable to public companies until such pronouncements are made applicable to private companies. Accordingly, the financial statements may not be comparable to the financial statements of companies that comply with such new or revised accounting standards.

Recent Accounting Developments

Recent Accounting Developments	9 Months Ended
	Jun. 30, 2016
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recent Accounting Developments	Recent Accounting Developments In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606). ASU 2014-09 is intended to clarify the principles for recognizing revenue and to develop a common revenue standard for U.S. GAAP. ASU 2014-09 is effective for annual reporting periods and interim periods within those annual periods beginning after December 15, 2019. Adoption by the Company is not expected to have a material impact on the consolidated financial statements and related disclosures. In June 2014, the FASB issued ASU 2014-12, Compensation - Stock Compensation (Topic 718) - Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved After the Requisite Service Period. ASU 2014-12 is intended to clarify the accounting for the timing of expense recognition related to employee share-based payments in which a performance target that effects vesting could be achieved after the requisite service period. ASU 2014-12 is effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Adoption by the Company is not expected to have a material impact on the consolidated financial statements and related disclosures. In August 2014, the FASB issued ASU 2014-14, Receivables - Troubled Debt Restructuring by Creditors (Topic 310) - Classification of Certain Government-Guaranteed Mortgage Loans Upon Foreclosure. ASU 2014-14 is intended to clarify the accounting for and improve the consistency of balance sheet classification of certain foreclosed mortgage loans that are either fully or partially guaranteed under government programs. Greater consistency in classification of such mortgage loans upon foreclosure is expected to provide more decision-useful information about a creditor's foreclosed mortgage loans that are expected to be recovered, at least in part, through government guarantees. ASU 2014-14 is effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Adoption by the Company is not expected to have a material impact on the consolidated financial statements and related disclosures. In January 2016, the FASB issued ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities. ASU 2016-01 is intended to enhance the reporting model for financial instruments to provide users of financial statements with more decision-useful information. ASU 2016-01 is effective for annual periods beginning after December 15, 2018, and interim periods within those annual periods beginning after December 15, 2019. Adoption by the Company is not expected to have a material impact on the consolidated financial statements and related disclosures. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). ASU 2016-02 is intended to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. ASU 2016-02 is effective for annual periods and interim periods within those annual periods beginning after December 15, 2018. The Company is evaluating the potential impact of ASU 2016-02 on the consolidated financial statements and related disclosures. In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326). ASU 2016-13 is intended to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity. ASU 2016-13 replaces the "incurred loss impairment methodology" with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. ASU 2016-13 is effective for annual periods and interim periods within those annual periods beginning after December 15, 2019. The Company is evaluating the potential impact of ASU 2016-13 on the consolidated financial statements and related disclosures.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Earnings per common share is computed using the two-class method. Basic earnings per common share is computed by dividing net income by the weighted-average number of common shares outstanding, adjusted for weighted average unallocated ESOP shares, during the applicable period, excluding outstanding participating securities. Participating securities include non-vested restricted stock awards to the extent holders of these securities are entitled to receive non-forfeitable dividends or dividend equivalents at the same rate as holders of the Company's common stock. Diluted earnings per share is computed using the weighted-average number of shares determined for the basic earnings per common share computation plus the dilutive effect of stock compensation using the treasury stock method. The following table presents a reconciliation of the number of shares used in the calculation of basic and diluted earnings per common share (in thousands, except share and per share data). Three Months Ended June 30, Nine Months Ended June 30, 2016 2015 2016 2015 Net income $ 906 $ 110 $ 2,818 $ 1,041 Basic potential common shares: Weighted average shares outstanding 3,961,643 4,264,273 4,054,921 4,585,717 Weighted average unallocated ESOP shares (335,982 ) (363,407 ) (345,153 ) (368,568 ) Basic weighted average shares outstanding 3,625,661 3,900,866 3,709,768 4,217,149 Dilutive effect of equity awards 43,580 9,081 33,525 — Diluted weighted average shares outstanding 3,669,241 3,909,947 3,743,293 4,217,149 Basic income per share $ 0.25 $ 0.03 $ 0.76 $ 0.25 Diluted income per share $ 0.25 $ 0.03 $ 0.75 $ 0.25

Investment Securitites

Investment Securitites	9 Months Ended
	Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities The amortized cost and fair value of investment securities are summarized as follows: June 30, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available for Sale U.S. Government and agency securities $ 24 $ 1 $ — $ 25 U.S. Government agency residential mortgage-backed securities 35,882 646 (31 ) 36,497 U.S. Government agency collateralized mortgage obligations 2,782 36 (15 ) 2,803 U.S. Government agency commercial mortgage-backed securities 12,226 165 (9 ) 12,382 Municipal securities-tax exempt 16,033 170 (6 ) 16,197 Municipal securities-taxable 14,846 499 (1 ) 15,344 Corporate securities 3,873 133 — 4,006 Total Available for Sale 85,666 1,650 (62 ) 87,254 Held to Maturity Municipal securities-tax exempt 2,293 100 — 2,393 Total Investment Securities $ 87,959 $ 1,750 $ (62 ) $ 89,647 September 30, 2015 Amortized Gross Gross Fair Available for Sale U.S. Government and agency securities $ 24 $ 1 $ — $ 25 U.S. Government agency residential mortgage-backed securities 39,380 456 (144 ) 39,692 U.S. Government agency collateralized mortgage obligations 1,963 18 (40 ) 1,941 U.S. Government agency commercial mortgage-backed securities 13,993 121 (15 ) 14,099 Municipal securities-tax exempt 2,209 7 (15 ) 2,201 Municipal securities-taxable 19,285 215 (34 ) 19,466 Corporate securities 2,852 12 (2 ) 2,862 Total Available for Sale 79,706 830 (250 ) 80,286 Held to Maturity Municipal securities-tax exempt 2,459 31 — 2,490 Total Investment Securities $ 82,165 $ 861 $ (250 ) $ 82,776 The amortized cost and fair value of investment securities, by contractual maturity, at June 30, 2016 are shown in the following table. Actual maturities differ from contractual maturities for mortgage-backed securities because the mortgages underlying the securities may be called or repaid without penalty. Therefore, these securities are not presented in the maturity categories in the table below. June 30, 2016 Amortized Cost Fair Value Available for sale: Due in one year or less $ 86 $ 86 Due after one year through five years 10,268 10,509 Due after five years through ten years 19,918 20,378 Due after ten years 4,504 4,599 U.S. Government agency collateralized mortgage obligations 2,782 2,803 U.S. Government agency residential mortgage-backed securities 35,882 36,497 U.S. Government agency commercial mortgage-backed securities 12,226 12,382 85,666 87,254 Held to maturity: Due in one year or less 168 168 Due after one year through five years 703 718 Due after five years through ten years 982 1,039 Due after ten years 440 468 2,293 2,393 Total $ 87,959 $ 89,647 Proceeds from sales of investment securities during the three months ended June 30, 2016 and 2015, were $15,482 and $5,672 , respectively. Gross realized gains, during the three months ended June 30, 2016 and 2015, on these sales amounted to $211 and $41 , respectively. Gross realized losses on these sales were $1 and $24 , during the three months ended June 30, 2016 and 2015, respectively. Proceeds from sales of investment securities during the nine months ended June 30, 2016 and 2015, were $24,222 and $23,208 , respectively. Gross realized gains, during the nine months ended June 30, 2016 and 2015, on these sales amounted to $234 and $166 , respectively. Gross realized losses on these sales were $13 and $76 , during the nine months ended June 30, 2016 and 2015, respectively. There were $4,445 and no investment securities that were pledged to secure deposits or for other purposes required or permitted by law at June 30, 2016 and September 30, 2015, respectively. Information pertaining to securities with gross unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, are summarized as follows: June 30, 2016 Less than 12 Months 12 Months or Longer Total Fair Value Unrealized Loss Fair Unrealized Fair Unrealized U.S. Government and agency securities $ — $ — $ — $ — $ — $ — U.S. Government agency residential mortgage-backed securities 2,544 — 3,309 (31 ) 5,853 (31 ) U.S. Government agency collateralized mortgage obligations — — 598 (15 ) 598 (15 ) U.S Government agency commercial mortgage-backed securities 5,022 (9 ) — — 5,022 (9 ) Municipal securities-Tax exempt 3,024 (6 ) — — 3,024 (6 ) Municipal securities-Taxable 301 (1 ) — — 301 (1 ) Corporate securities — — — — — — $ 10,891 $ (16 ) $ 3,907 $ (46 ) $ 14,798 $ (62 ) September 30, 2015 Less than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized U.S. Government and agency securities $ — $ — $ — $ — $ — $ — U.S. Government agency residential mortgage-backed securities 7,270 (59 ) 6,168 (85 ) 13,438 (144 ) U.S. Government agency collateralized mortgage obligations — — 627 (40 ) 627 (40 ) U.S. Government agency commercial mortgage-backed securities 3,511 (15 ) — — 3,511 (15 ) Municipal securities-Tax exempt 1,027 (15 ) — — 1,027 (15 ) Municipal securities-Taxable 2,634 (30 ) 151 (4 ) 2,785 (34 ) Corporate securities 510 (2 ) — — 510 (2 ) $ 14,952 $ (121 ) $ 6,946 $ (129 ) $ 21,898 $ (250 ) At June 30, 2016, the Company's investment portfolio included 5 securities available-for-sale which had been in an unrealized loss position for more than twelve months and 17 securities available-for-sale which had been in an unrealized loss position for less than twelve months. The Company believes that these securities are acceptable credit risks. Based upon an evaluation of the available evidence, including recent changes in market rates, credit rating information and information obtained from regulatory filings, management believes the decline in fair value for these securities is temporary. The Company does not have any current requirement to sell and does not currently intend to sell these securities prior to any anticipated recovery in fair value. At September 30, 2015, the investment portfolio included 9 securities available-for-sale which had been in an unrealized loss position for greater than twelve months and 22 securities available-for-sale which had been in an unrealized loss position for less than twelve months.

Loans

Loans	9 Months Ended
	Jun. 30, 2016
Loans and Leases Receivable Disclosure [Abstract]
Loans	Loans A summary of the balances of loans as of the dates indicated follows: June 30, 2016 September 30, Real estate: Single family $ 153,613 $ 153,141 Multifamily 123,799 105,750 Commercial real estate 174,955 162,957 Construction and land development 16,949 18,831 Total real estate 469,316 440,679 Commercial business 36,501 38,200 Consumer: Home equity lines of credit 14,758 14,881 Education 3,511 4,106 Other 505 523 Total consumer 18,774 19,510 Total loans 524,591 498,389 Less: Net deferred loan fees 197 366 Allowance for loan losses 5,062 4,598 Net loans $ 519,332 $ 493,425 The following tables present the contractual aging of the Company's recorded investment in past due loans by class of loans as of June 30, 2016 and September 30, 2015: June 30, 2016 Current 30-59 Days Past Due 60-89 Days Past Due Loans Past or More Total Single family $ 152,975 $ 415 $ — $ 223 $ 153,613 Multifamily 123,799 — — — 123,799 Commercial real estate 174,955 — — — 174,955 Construction and land development 16,949 — — — 16,949 Commercial business 36,501 — — — 36,501 Consumer and other: Home equity lines of credit 14,731 — — 27 14,758 Education 3,410 29 7 65 3,511 Other 505 — — — 505 $ 523,825 $ 444 $ 7 $ 315 $ 524,591 September 30, 2015 Current 30-59 Days Past Due 60-89 Days Past Due Loans Past or More Total Single family $ 152,245 $ 473 $ 83 $ 340 $ 153,141 Multifamily 105,750 — — — 105,750 Commercial real estate 162,957 — — — 162,957 Construction and land development 18,827 4 — — 18,831 Commercial business 38,200 — — — 38,200 Consumer and other: Home equity lines of credit 14,691 — — 190 14,881 Education 3,782 79 — 245 4,106 Other 523 — — — 523 $ 496,975 $ 556 $ 83 $ 775 $ 498,389 There were no loans past due ninety days or more and still accruing interest as of June 30, 2016 and September 30, 2015. The following table presents the recorded investment in nonaccrual loans by class of loans as of June 30, 2016 and September 30, 2015: June 30, 2016 September 30, 2015 Single family $ 453 $ 340 Multifamily — — Commercial real estate — — Construction and land development — — Commercial business — — Consumer and other: Home equity lines of credit 37 203 Education 72 260 Other — — $ 562 $ 803 As part of the on-going monitoring of the credit quality of the Company’s loan portfolio, management categorizes loans into risk categories based on relevant information about the ability of the borrowers to service their debt and comply with various terms of their underlying loan agreements. The Company considers current financial information, historical payment experience, credit documentation, public information and current economic trends when classifying its loans into risk categories. Generally, all sizable credits receive a financial review no less than annually to monitor and adjust, if necessary, the credit’s risk profile. Credits classified as special mention, substandard or doubtful generally receive a review more frequently than annually. The Company categorizes performing, potential problem, and problem loans into the following risk categories based on relevant information about the ability of borrowers to service their debt: Pass — A pass asset is well protected by the current worth and paying capacity of the obligor (or guarantors, if any) or by the fair value, less costs to acquire and sell in a timely manner, of any underlying collateral. Watch — A watch asset has potential weaknesses that deserve management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the asset or in the Company’s credit position at some future date. Watch assets are a sub-category of Pass which do not expose the Company to sufficient risk to warrant further classification. Special Mention — A special mention asset has characteristics of deterioration in quality exhibited by any number of well-defined weaknesses requiring significant corrective action. The repayment ability of the borrower has not been validated, or has become marginal or weak, and the loan may have exhibited some overdue payments or payment extensions and/or renewals. Substandard — A substandard asset is an asset with a well-defined weakness that jeopardizes repayment, in whole or in part, of the debt. These credits are inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged. These assets are characterized by the distinct possibility that the Company will or has sustained some loss of principal and/or interest if the deficiencies are not corrected. Doubtful — A doubtful asset is an asset that has all the weaknesses inherent in the substandard classification with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. These credits have a high probability for loss, yet because certain important and reasonably specific pending factors may work toward the strengthening of the asset, its classification of loss is deferred until its more exact status can be determined. Homogeneous loan types are assessed for credit quality based on the contractual aging status of the loan and payment activity. In certain cases, based upon payment performance, the loan being related with another commercial type loan or for other reasons, a loan may be categorized into one of the risk categories noted above, unless such loan carries private mortgage insurance (PMI). Such assessment is completed at the end of each reporting period. The following tables present the risk category of loans evaluated by internal asset classification based on the most recent analysis performed by the Company and the contractual aging as of June 30, 2016 and September 30, 2015: June 30, 2016 Pass Watch Special Mention Substandard Doubtful Total Single family $ 150,922 $ 750 $ — $ 1,941 $ — $ 153,613 Multifamily 122,032 1,767 — — — 123,799 Commercial real estate 170,811 3,745 399 — — 174,955 Construction and land development 16,947 — — 2 — 16,949 Commercial business 32,087 4,194 220 — — 36,501 Consumer and other: Home equity lines of credit 14,621 — — 137 — 14,758 Education 3,511 — — — — 3,511 Other 505 — — — — 505 Total $ 511,436 $ 10,456 $ 619 $ 2,080 $ — $ 524,591 September 30, 2015 Pass Watch Special Mention Substandard Doubtful Total Single family $ 150,421 $ 1,135 $ — $ 1,585 $ — $ 153,141 Multifamily 103,117 2,633 — — — 105,750 Commercial real estate 159,104 3,136 410 307 — 162,957 Construction and land development 18,831 — — — — 18,831 Commercial business 36,561 — — 1,639 — 38,200 Consumer and other: Home equity lines of credit 14,636 — — 245 — 14,881 Education 4,106 — — — — 4,106 Other 523 — — — — 523 $ 487,299 $ 6,904 $ 410 $ 3,776 $ — $ 498,389 The following tables provide additional detail of the activity in the allowance for loan losses, by portfolio segment, for the three months ended June 30, 2016 and 2015: Three Months Ended June 30, 2016 Single Family Multifamily Commercial Real Estate Construction and Land Development Commercial Business Consumer and Other Total Allowance for loan losses: Beginning balance $ 1,058 $ 1,180 $ 1,801 $ 335 $ 420 $ 69 $ 4,863 Provision for loan losses (7 ) 23 233 (8 ) 5 4 250 Loans charged-off (59 ) — — — — — (59 ) Recoveries — — — — 7 1 8 Ending balance $ 992 $ 1,203 $ 2,034 $ 327 $ 432 $ 74 $ 5,062 Period-ended amount allocated for: Individually evaluated for impairment $ 1 $ — $ — $ — $ — $ 53 $ 54 Collectively evaluated for impairment 991 1,203 2,034 327 432 21 5,008 Ending balance $ 992 $ 1,203 $ 2,034 $ 327 $ 432 $ 74 $ 5,062 Loans: Individually evaluated for impairment $ 1,740 $ 1,767 $ — $ — $ — $ 90 $ 3,597 Collectively evaluated for impairment 151,873 122,032 174,955 16,949 36,501 18,684 520,994 Ending balance $ 153,613 $ 123,799 $ 174,955 $ 16,949 $ 36,501 $ 18,774 $ 524,591 Three Months Ended Single Family Multifamily Commercial Construction and Commercial Consumer Total Allowance for loan losses: Beginning balance $ 1,064 $ 1,025 $ 1,507 $ 361 $ 415 $ 111 $ 4,483 Provision for loan losses 7 22 45 7 37 32 150 Loans charged-off (28 ) — (53 ) — — (24 ) (105 ) Recoveries 1 — 1 — 4 2 8 Ending balance $ 1,044 $ 1,047 $ 1,500 $ 368 $ 456 $ 121 $ 4,536 Period-ended amount allocated for: Individually evaluated for impairment $ 40 $ — $ — $ — $ — $ 56 $ 96 Collectively evaluated for impairment 1,004 1,047 1,500 368 456 65 4,440 Ending balance $ 1,044 $ 1,047 $ 1,500 $ 368 $ 456 $ 121 $ 4,536 Loans: Individually evaluated for impairment $ 1,578 $ 1,853 $ — $ — $ — $ 226 $ 3,657 Collectively evaluated for impairment 149,951 97,097 158,861 23,013 39,863 18,937 487,722 Ending balance $ 151,529 $ 98,950 $ 158,861 $ 23,013 $ 39,863 $ 19,163 $ 491,379 The following tables provide additional detail of the activity in the allowance for loan losses, by portfolio segment, for the nine months ended June 30, 2016 and 2015: Nine Months Ended June 30, 2016 Single Family Multifamily Commercial Real Estate Construction and Land Development Commercial Business Consumer and Other Total Allowance for loan losses: Beginning balance $ 1,073 $ 1,013 $ 1,604 $ 330 $ 498 $ 80 $ 4,598 Provision for loan losses (5 ) 190 428 (3 ) (82 ) (3 ) 525 Loans charged-off (89 ) — — — — (10 ) (99 ) Recoveries 13 — 2 — 16 7 38 Ending balance $ 992 $ 1,203 $ 2,034 $ 327 $ 432 $ 74 $ 5,062 Period-ended amount allocated for: Individually evaluated for impairment $ 1 $ — $ — $ — $ — $ 53 $ 54 Collectively evaluated for impairment 991 1,203 2,034 327 432 21 5,008 Ending Balance $ 992 $ 1,203 $ 2,034 $ 327 $ 432 $ 74 $ 5,062 Loans: Individually evaluated for impairment $ 1,740 $ 1,767 $ — $ — $ — $ 90 $ 3,597 Collectively evaluated for impairment 151,873 122,032 174,955 16,949 36,501 18,684 520,994 Ending Balance $ 153,613 $ 123,799 $ 174,955 $ 16,949 $ 36,501 $ 18,774 $ 524,591 Nine Months Ended Single Family Multifamily Commercial Construction and Commercial Consumer Total Allowance for loan losses: Beginning balance $ 1,072 $ 757 $ 1,412 $ 301 $ 454 $ 76 $ 4,072 Provision for loan losses 196 290 184 67 1 62 800 Loans charged-off (236 ) — (115 ) — (14 ) (26 ) (391 ) Recoveries 12 — 19 — 15 9 55 Ending balance $ 1,044 $ 1,047 $ 1,500 $ 368 $ 456 $ 121 $ 4,536 Period-ended amount allocated for: Individually evaluated for impairment $ 40 $ — $ — $ — $ — $ 56 $ 96 Collectively evaluated for impairment 1,004 1,047 1,500 368 456 65 4,440 Ending balance $ 1,044 $ 1,047 $ 1,500 $ 368 $ 456 $ 121 $ 4,536 Loans: Individually evaluated for impairment $ 1,578 $ 1,853 $ — $ — $ — $ 226 $ 3,657 Collectively evaluated for impairment 149,951 97,097 158,861 23,013 39,863 18,937 487,722 Ending balance $ 151,529 $ 98,950 $ 158,861 $ 23,013 $ 39,863 $ 19,163 $ 491,379 The following tables present additional detail of impaired loans, segregated by segment, as of and for the three and nine month periods ended June 30, 2016 and 2015. The unpaid principal balance represents the recorded balance prior to any partial charge-offs on the loans as of the dates indicated. The recorded investment represents customer balances net of any partial charge-offs recognized on the loans as of the dates indicated. The interest income recognized column represents all interest income on a loan reported on either a cash or accrual basis after the loan became impaired. Three months ended Nine months ended June 30, 2016 Unpaid Principal Balance Recorded Investment Allowance for Loan Losses Allocated Average Recorded Investment Interest Income Recognized Average Interest With no related allowance recorded: Single family $ 1,601 $ 1,430 $ — $ 1,428 $ 18 $ 1,308 $ 55 Multifamily 1,824 1,767 — 1,778 19 1,801 57 Commercial real estate — — — — — — — Construction and land development 4 — — — — — — Commercial business — — — — — — — Consumer and other 115 37 — 38 — 71 — With an allowance recorded: Single family 310 310 1 311 3 361 11 Multifamily — — — — — — — Commercial real estate — — — — — — — Construction and land development — — — — — — — Commercial business — — — — — — — Consumer and other 53 53 53 54 1 54 2 $ 3,907 $ 3,597 $ 54 $ 3,609 $ 41 $ 3,595 $ 125 Three months ended Nine months ended June 30, 2015 Unpaid Principal Balance Recorded Investment Allowance for Loan Losses Allocated Average Recorded Investment Interest Income Recognized Average Interest With no related allowance recorded: Single family $ 1,376 $ 1,263 $ — $ 1,315 $ 13 $ 1,298 $ 36 Multifamily 1,941 1,853 — 1,864 20 1,884 60 Commercial real estate — — — 543 — 527 — Construction and land development — — — — — — — Commercial business — — — — — — — Consumer and other 272 170 — 196 — 210 — With an allowance recorded: Single family 315 315 40 316 4 336 11 Multifamily — — — — — — — Commercial real estate — — — — — 41 — Construction and land development — — — — — — — Commercial business — — — — — — — Consumer and other 56 56 56 57 1 57 2 $ 3,960 $ 3,657 $ 96 $ 4,291 $ 38 $ 4,353 $ 109 The following is a summary of troubled debt restructured loans (TDRs) at June 30, 2016 and September 30, 2015: June 30, 2016 September 30, 2015 Troubled debt restructurings - accrual $ 3,050 $ 3,134 Troubled debt restructurings - nonaccrual — — $ 3,050 $ 3,134 Modifications of loan terms as a TDR are generally in the form of an extension of payment terms or a lowering of the interest rate, although occasionally the Company has reduced the outstanding principal balance. There were no loans modified as a TDR during the three or nine months ended June 30, 2016 and 2015. There were no re-defaults of TDRs that occurred during the three or nine months ended June 30, 2016 and 2015. Certain of the Bank’s executive officers, directors, and their associates are loan customers of the Bank. As of June 30, 2016 and September 30, 2015, loans of approximately $3,794 and $3,334 , respectively, were outstanding to such parties. These loans were underwritten to the same standards as those used for comparable transactions with other unrelated persons and do not involve more than the normal risk of collectability. An analysis of such loans is as follows: Nine Months Ended June 30, 2016 Balance, beginning $ 3,334 New loans originated 927 Draws on lines of credit 157 Principal repayments (993 ) Other 1 369 Balance, ending $ 3,794 1 Officer, with existing loan, was promoted to executive officer position during the period.

Deposits

Deposits	9 Months Ended
	Jun. 30, 2016
Deposits [Abstract]
Deposits	Deposits The following table presents the composition of deposits as of: June 30, 2016 September 30, 2015 Amount Percent Amount Percent Checking Accounts: Noninterest bearing $ 106,551 18.91 % $ 101,486 19.11 % Interest bearing 132,676 23.54 % 131,968 24.85 % 239,227 42.45 % 233,454 43.96 % Passbook and Statement Savings 133,754 23.74 % 127,431 24.00 % Variable Rate Money Market Accounts 58,168 10.32 % 47,876 9.02 % Certificates of Deposit 132,366 23.49 % 122,259 23.02 % $ 563,515 100.00 % $ 531,020 100.00 % Certificates of deposit over one hundred thousand dollars totaled $75,674 and $64,155 as of June 30, 2016 and September 30, 2015, respectively. Of these amounts, $11,826 and $8,775 are equal to or greater than two hundred fifty thousand dollars as of June 30, 2016 and September 30, 2015, respectively.

Regulatory Capital

Regulatory Capital	9 Months Ended
	Jun. 30, 2016
Regulatory Capital Requirements [Abstract]
Regulatory Capital	Regulatory Capital The federal banking agencies have adopted regulations that substantially amend the capital regulations currently applicable to us. These regulations implement the Basel III regulatory capital reforms and changes required by the Dodd-Frank Act. Effective January 1, 2015 (with some changes transitioned into full effectiveness over two to four years), the Bank became subject to new capital requirements adopted by the Office of the Comptroller of the Currency ("OCC"). These new requirements (1) create a new required capital ratio for common equity Tier 1 ("CETI") capital, (2) increase the leverage and Tier 1 capital ratios, (3) change the risk weight of certain assets for purposes of the risk-based capital ratios, (4) create an additional capital conservation buffer over the required capital ratios and (5) change what qualifies as capital for purposes of meeting these various capital requirements. Beginning in 2016, failure to maintain the required capital conservation buffer limits the ability of the Bank to pay dividends, repurchase shares or pay discretionary bonuses. The Company is exempt from consolidated capital requirements as those requirements do not apply to certain small savings and loan holding companies with assets under $1 billion. Under the new capital regulations, the initial minimum capital ratios are: (1) CETI capital ratio of 4.5% of risk-weighted assets; (2) a Tier 1 capital ratio of 6.0% of risk-weighted assets; (3) a total capital ratio of 8.0% of risk-weighted assets; and (4) a leverage ratio of 4.0%. CETI generally consists of common stock and retained earnings, subject to applicable regulatory adjustments and deductions. In addition to the minimum CETI, Tier 1 and total capital ratios, the Bank will have to maintain a capital conservation buffer consisting of additional CETI capital greater than 2.5% of risk-weighted assets above the required minimum levels in order to avoid limitations on paying dividends, engaging in share repurchases, and paying discretionary bonuses based on percentages of eligible retained income that could be utilized for such actions. This new capital conservation buffer requirement is being phased in for the Bank beginning in January 2016 at 0.625% of risk-weighted assets and increasing each year until fully implemented in January 2019. There are a number of changes imposed under the new regulations in what constitutes regulatory capital, some of which are subject to transition periods. These changes include the phasing-out of certain instruments as qualifying capital. The Bank does not use any of these instruments. Under the new requirements for total capital, Tier 2 capital is no longer limited to the amount of Tier 1 capital included in total capital. Mortgage servicing rights, certain deferred tax assets and investments in unconsolidated subsidiaries over designated percentages of CETI will be deducted from capital. The Bank has elected to permanently opt-out of the inclusion of accumulated other comprehensive income in our capital calculations, as permitted by the regulations. We believe this opt-out will reduce the impact of market volatility on our regulatory capital levels. The new requirements also include changes in the risk-weights of assets to better reflect credit risk and other risk exposures. These include a 150% risk weight (increased from 100%) for certain high volatility commercial real estate acquisition, development and construction loans and for non-residential mortgage loans that are 90 days past due or are otherwise in non-accrual status; a 20% (increased from 0%) credit conversion factor for the unused portion of a commitment with an original maturity of one year or less that is not unconditionally cancellable; a 250% risk weight (increased from 100%) for mortgage servicing and deferred tax assets that are not deducted from capital; and increased risk weights (0% to 600%) for equity exposures. Additionally, the OCC's prompt corrective action standards changed effective January 1, 2015. Under the new standards, in order to be considered well-capitalized, the Bank must have a CETI ratio of 6.5% (new), a Tier 1 ratio of 8.0% (increased from 6.0%), a total risk-based capital ratio of 10.0% (unchanged) and a leverage ratio of 5.0% (unchanged). As of June 30, 2016 the Bank met all these new requirements, including the full capital conservation buffer of 2.5%. The Bank’s actual capital amounts and ratios and those required by the regulatory standards are presented in the following tables. For June 30, 2016, we have included the 0.625% increase for 2016 in our minimum capital adequacy ratios in the table below. At June 30, 2016 Actual For Capital Adequacy Purposes For Capital Adequacy Purposes with Capital Buffer To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Ratio Amount Ratio Amount Ratio Amount Ratio CETI capital (to risk-weighted assets) - Westbury Bank $ 67,298 12.08 % $ 25,069 4.50 % 28,551 5.125 % $ 36,211 6.50 % Tier 1 capital (to risk-weighted assets) - Westbury Bank 67,298 12.08 % 33,425 6.00 % 36,907 6.625 % 44,567 8.00 % Total capital (to risk-weighted assets) - Westbury Bank 72,360 12.99 % 44,567 8.00 % 48,049 8.625 % 55,709 10.00 % Leverage (to adjusted total assets) - Westbury Bank 67,298 9.87 % 27,274 4.00 % N/A N/A 34,092 5.00 % At September 30, 2015 Actual For Capital Adequacy To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Ratio Amount Ratio Amount Ratio CET1 capital (to risk-weighted assets) - Westbury Bank $ 64,155 12.25 % $ 23,567 4.50 % $ 34,041 6.50 % Tier 1 capital (to risk-weighted assets) - Westbury Bank 64,155 12.25 % 31,423 6.00 % 41,897 8.00 % Total capital (to risk-weighted assets) - Westbury Bank 68,753 13.12 % 41,923 8.00 % 52,403 10.00 % Leverage (to adjusted total assets) - Westbury Bank 64,155 10.01 % 25,636 4.00 % 32,045 5.00 % The following table reconciles the Bank’s stockholder's equity to regulatory capital as of June 30, 2016 and September 30, 2015: June 30, 2016 September 30, 2015 Stockholder's equity of the Bank $ 72,808 $ 70,976 Less: Unrealized gain on securities (965 ) (352 ) Disallowed investment in subsidiary (3,296 ) (3,296 ) Disallowed deferred tax assets (1,249 ) (3,173 ) Tier 1, CETI and leverage capital 67,298 64,155 Plus: Allowable general valuation allowances 5,062 4,598 Total capital $ 72,360 $ 68,753

Commitments

Commitments	9 Months Ended
	Jun. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments	Commitments The Company is a party to financial instruments with off-balance-sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit and involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the accompanying consolidated balance sheets. The contractual 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 other party to the financial instruments for commitments to extend credit is represented by the contractual amount of those instruments. The Company uses the same credit policies in making commitments and conditional obligations as it does for on-balance-sheet instruments. Company management has determined that the following instruments were outstanding, whose contract amounts represent credit risk as of the dates noted below: June 30, 2016 September 30, 2015 Commitments to extend mortgage credit: Fixed rate $ 11,305 $ 8,443 Adjustable rate 314 9,929 Unused commercial loan lines of credit 90,752 54,225 Unused home equity line of credit 27,034 26,164 Standby letters of credit 574 884 Commitment to sell loans 2,187 431 Commitments to extend credit are agreements to lend funds to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. As some such commitments expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The Company generally extends credit only on a secured basis. Collateral obtained varies but consists primarily of single family residences. Unfunded commitments under lines of credit are commitments for possible future extensions of credit to existing customers. These lines of credit may be uncollateralized and ultimately may not be drawn upon to the total extent to which the Company is committed. Standby 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 public and private borrowing arrangements, and, generally, have terms of one year or less. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. The Company holds collateral supporting those commitments if deemed necessary. In the event the customer does not perform in accordance with the terms of the agreement with the third party, the Company would be required to fund the commitment. The maximum potential amount of future payments the Company could be required to make is represented by the contractual amount shown in the summary above. If the commitment is funded, the Company would be entitled to seek recovery from the customer. At June 30, 2016 and September 30, 2015, no amounts have been recorded as liabilities for the Company’s potential obligations under these guarantees. Commitments to sell loans are commitments to sell single family mortgage loans to investors on the secondary market.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements ASC Topic 820, Fair Value Measurements and Disclosures , defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. ASC Topic 820 requires the use of valuation techniques that are consistent with the market approach, the income approach and/or the cost approach. Inputs to valuation techniques refer to the assumptions that market participants would use in pricing the asset or liability. Inputs may be observable, meaning those that reflect the assumptions market participants would use in pricing the asset or liability developed based on market data obtained from independent sources, or unobservable, meaning those that reflect the reporting entity’s own assumptions about the assumptions market participants would use in pricing the asset or liability developed based on the best information available in the circumstances. In that regard, ASC Topic 820 establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows: Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date. Level 2: Significant other observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data. Level 3: Significant unobservable inputs that reflect a reporting entity’s own assumptions about the assumptions that market participants would use in pricing an asset or liability. A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the fair value hierarchy, is set forth below. Financial Instruments Recorded at Fair Value on a Recurring Basis Securities available-for-sale : The fair value of the Company’s securities available-for-sale is determined using Level 2 inputs, which are derived from readily available pricing sources and third-party pricing services for comparable instruments. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, treasury yield curves, trading levels, credit information and credit terms, among other factors. In certain cases where Level 1 or Level 2 inputs are not available, securities are classified within Level 3 of the fair value hierarchy. Derivatives : The fair values of the Company’s embedded derivatives related to certain certificates of deposit are determined using inputs that are observable or that can be corroborated by observable market data (such as the S&P 500 Index and the 10 - year U.S. Treasury rate) and, therefore, are classified within Level 2 of the fair value hierarchy. The following table summarizes financial instruments measured at fair value on a recurring basis, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value as of the dates indicated below: Fair Value Measurements June 30, 2016 Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Other Unobservable Inputs (Level 3) Assets Securities available-for-sale U.S. Government and agency securities $ 25 $ — $ 25 $ — U.S. Government agency residential mortgage-backed securities 36,497 — 36,497 — U.S. Government agency collateralized mortgage obligations 2,803 — 2,803 — U.S. Government agency commercial mortgage-backed securities 12,382 — 12,382 — Municipal securities-tax exempt 16,197 — 16,197 — Municipal securities-taxable 15,344 — 15,344 — Corporate securities 4,006 — 4,006 — Total securities available-for-sale $ 87,254 $ — $ 87,254 $ — Derivatives $ 97 $ — $ 97 $ — Liabilities Derivatives $ 97 $ — $ 97 $ — Fair Value Measurements September 30, 2015 Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Other Assets Securities available-for-sale U.S. Government and agency securities $ 25 $ — $ 25 $ — U.S. Government agency residential mortgage-backed securities 39,692 — 39,692 — U.S. Government agency collateralized mortgage obligations 1,941 — 1,941 — U.S. Government agency commercial mortgage-backed securities 14,099 — 14,099 — Municipal securities-tax exempt 2,201 — 2,201 — Municipal securities-taxable 19,466 — 19,466 — Corporate securities 2,862 — 2,862 — Total securities available-for-sale $ 80,286 $ — $ 80,286 $ — Derivatives $ 110 $ — $ 110 $ — Liabilities Derivatives $ 110 $ — $ 110 $ — The Company did not have any transfers between Level 1, Level 2, and Level 3 of the fair value hierarchy during the nine months ended June 30, 2016. The Company’s policy for determining transfers between levels occurs at the end of the reporting period when circumstances in the underlying valuation criteria change and, therefore, result in a transfer between levels. Financial Instruments Recorded at Fair Value on a Nonrecurring Basis The Company may be required, from time to time, to measure certain financial instruments at fair value on a nonrecurring basis in accordance with U.S. generally accepted accounting principles. Impaired loans : The Company does not record loans at fair value on a recurring basis. The specific reserves for collateral-dependent impaired loans are based on the fair value of the collateral less estimated costs to sell. The fair value of collateral is determined based on appraisals. In some cases, adjustments were made to the appraised values due to various factors including age of the appraisal, age of comparables included in the appraisal, and known changes in the market and in the collateral. When significant adjustments were based on unobservable inputs, the resulting fair value measurement has been categorized as a Level 3 measurement. Impaired loans with a carrying amount of $363 and $467 had a valuation allowance of $54 and $77 included in the allowance for loan losses to reflect their fair value as of June 30, 2016 and September 30, 2015, respectively. Foreclosed real estate : The Company does not record foreclosed real estate owned at fair value on a recurring basis. The fair value of foreclosed real estate was determined using Level 3 inputs based on appraisals or broker pricing opinions. In some cases, adjustments were made to these values due to various factors including the age of the appraisal, age of comparables included in the appraisal, and known changes in the market and in collateral. Foreclosed real estate is measured at fair value less estimated costs to sell at the date of foreclosure. Subsequent to foreclosure, additional writedowns may be recorded based on changes to the fair value of the assets. Mortgage servicing rights : Mortgage servicing rights ("MSRs") do not trade in an active, open market with readily observable prices. While sales of MSRs do occur, the precise terms and conditions typically are not readily available. Accordingly, the Company estimates the fair value of MSRs using discounted cash flow models incorporating numerous assumptions from the perspective of market participants including servicing income, servicing costs, market discount rates, prepayments speeds, and default rates. Due to the nature of the valuation inputs, MSRs are classified within Level 3 of the valuation hierarchy. As of June 30, 2016, mortgage servicing rights with a carrying amount of $1,095 had a valuation allowance of $212 to reflect their fair value of $883 . As of September 30, 2015, mortgage servicing rights with a carrying amount of $1,315 had a valuation allowance of $105 to reflect their fair value of $1,210 . Real estate held for sale: The Company does not record real estate held for sale at fair value on a recurring basis. The fair value of real estate held for sale was determined using Level 3 inputs based on appraisals or broker pricing opinions. In some cases, adjustments were made to these values due to various factors including the age of the appraisal, age of comparables included in the appraisal, and known changes in the market. Real estate held for sale is measured at fair value less estimated costs to sell at the time of transfer. Subsequent to transfer, additional writedowns may be recorded based on changes to the fair value of the assets. Fair Value Measurements June 30, 2016 Total Quoted Prices in Significant Other Significant Other Assets Impaired loans $ 309 $ — $ — $ 309 Foreclosed real estate — — — — Mortgage servicing rights 883 — — 883 Real estate held for sale 717 — — 717 Fair Value Measurements September 30, 2015 Total Quoted Prices in Significant Other Significant Other Assets Impaired loans $ 390 $ — $ — $ 390 Foreclosed real estate 283 — — 283 Mortgage servicing rights 1,210 — — 1,210 Real estate held for sale 882 — — 882 Disclosure of fair value information about financial instruments, for which it is practicable to estimate that value, is required whether or not recognized in the accompanying consolidated balance sheets. 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. In that regard, the derived fair value estimates cannot be substantiated by comparison to independent markets and, in many cases, could not be realized in immediate settlement of the instruments. Certain financial instruments with a fair value that is not practicable to estimate and all non-financial instruments are excluded from the disclosure requirements. Accordingly, the aggregate fair value amounts presented herein do not necessarily represent the underlying value of the Company for assets and liabilities not previously described. The Company, in estimating its fair value disclosures for financial instruments not described above, used the following methods and assumptions: Cash and cash equivalents : The carrying amounts of cash and cash equivalents reported in the accompanying consolidated balance sheets approximate those assets’ fair values. Securities held to maturity: The fair values of securities held to maturity are based on quoted market prices for similar securities, adjusted for differences in security characteristics. Loans : For variable-rate mortgage loans that re-price frequently and with no significant change in credit risk, fair values are based on carrying values. The fair values for fixed rate residential mortgage loans are based on quoted market prices for similar loans sold in conjunction with sale transactions, adjusted for differences in loan characteristics. The fair values for commercial real estate or business loans, rental property mortgage loans, and consumer and other loans are estimated using discounted cash flow analyses and using interest rates currently being offered for loans with similar terms to borrowers of similar credit quality. Loans held for sale : Fair value of loans held for sale are based on commitments on hand from investors or prevailing market prices. Federal Home Loan Bank stock : The carrying amount of FHLB stock approximates its fair value based on the redemption provisions of the FHLB. Accrued interest receivable and payable : The carrying amounts of accrued interest receivable and payable approximate their fair values. Deposits : The fair value disclosed for interest-bearing and non-interest-bearing checking accounts, savings accounts, and money market accounts are equal to the amount payable on demand at the reporting date (i.e., their carrying amounts). The fair values of fixed rate certificates of deposit are estimated using a discounted cash flow calculation that applies interest rates currently being offered on certificates to a schedule of aggregated expected monthly maturities of the outstanding certificates of deposit. Advances from the Federal Home Loan Bank : The fair values of FHLB advances are estimated using discounted cash flow analyses, based on the Company’s current incremental borrowing rates for similar types of borrowing arrangements. Advance payments by borrowers for property taxes and insurance : The carrying amounts of the advance payments by borrowers for property taxes and insurance approximate their fair values. Mortgage banking derivatives : The fair value of commitments to originate mortgage loans held for sale is estimated by comparing the Company’s cost to acquire mortgages and the current price for similar mortgage loans, taking into account the terms of the commitments and the credit worthiness of the counterparties. The fair value of forward commitments to sell residential mortgage loans is the estimated amount that the Bank would receive or pay to terminate the forward delivery contract at the reporting date based on market prices for similar financial instruments. The fair value of these derivative financial instruments was not material at June 30, 2016 and September 30, 2015. The estimated fair values and related carrying amounts of the Company’s financial instruments as of the dates noted below were as follows: June 30, 2016 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Other Unobservable Inputs (Level 3) Financial assets: Cash and cash equivalents $ 17,817 $ 17,817 $ 17,817 $ — $ — Securities available for sale 87,254 87,254 — 87,254 — Securities held to maturity 2,293 2,393 — 2,393 — Loans, net 519,332 521,999 — — 521,999 Loans held for sale, net 2,187 2,187 — 2,187 — Federal Home Loan Bank stock 1,301 1,301 — — 1,301 Mortgage servicing rights 883 883 — — 883 Accrued interest receivable 2,091 2,091 2,091 — — Derivative asset 97 97 — 97 — Financial liabilities: Deposits 563,515 538,578 106,551 — 432,027 Short-term advances from Federal Home Loan Bank — — — — — Long-term advances from Federal Home Loan Bank 20,000 19,647 — — 19,647 Advance payments by borrowers for property taxes and insurance 3,637 3,637 3,637 — — Accrued interest payable 5 5 5 — — Derivative liability 97 97 — 97 — September 30, 2015 Carrying Estimated Fair Quoted Prices in Significant Other Significant Other Financial assets: Cash and cash equivalents $ 16,488 $ 16,488 $ 16,488 $ — $ — Securities available for sale 80,286 80,286 — 80,286 — Securities held to maturity 2,459 2,490 — 2,490 — Loans, net 493,425 493,480 — — 493,480 Loans held for sale, net 431 431 — 431 — Federal Home Loan Bank stock 3,350 3,350 — — 3,350 Mortgage servicing rights 1,210 1,210 — — 1,210 Accrued interest receivable 1,965 1,965 1,965 — — Derivative asset 110 110 — 110 — Financial liabilities: Deposits 531,020 508,339 101,486 — 406,853 Short-term advances from Federal Home Loan Bank 18,000 18,000 — 18,000 — Long-term advances from Federal Home Loan Bank — — — — — Advance payments by borrowers for property taxes and insurance 5,382 5,382 5,382 — — Accrued interest payable 5 5 5 — — Derivative liability 110 110 — 110 —

Employee Stock Ownership Plan

Employee Stock Ownership Plan	9 Months Ended
	Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Employee Stock Ownership Plan	Employee Stock Ownership Plan The Bank maintains a leveraged employee stock ownership plan ("ESOP") that covers all employees meeting certain minimum age and service requirements. The ESOP was established in conjunction with the Company's stock offering completed in April 2013 and operates on a plan year ending December 31. The ESOP initially borrowed $4.1 million from the Company and used those funds to acquire 411,403 shares, or 8.0% of the total number of shares issued by the Company in its initial public offering. The shares were acquired at a price of $10.00 per share. The Bank makes annual contributions to the ESOP equal to the ESOP's debt service. Additional principal payments, which serve to pay down the debt and accelerate the release of ESOP shares, may be made by the Bank at the discretion of its Board of Directors. The ESOP shares were pledged as collateral for its debt obligations to the Company. As the debt is repaid, shares are released from collateral and allocated to active participants, based on the proportion of debt service paid in the year. The debt repayment and release of shares generally occurs at December 31, the plan year end date. The Company accounts for its ESOP in accordance with ASC 718-40. Accordingly, because the debt is intercompany, it is eliminated in consolidation for presentation in these financial statements. The shares pledged as collateral are reported as unearned ESOP shares in the accompanying balance sheet. Total ESOP shares may be reduced as a result of employees leaving the Company as shares that have previously been released to those exiting employees may be removed from the ESOP and transferred to that employee. As shares are committed to be released from collateral, the Company reports compensation expense equal to the current market price of the released shares, and the released shares become outstanding for EPS computations. During each of the three months ended June 30, 2016 and 2015, 10,285 and 5,143 shares were committed to be released, respectively. The total ESOP compensation expense recorded for the three months ended June 30, 2016 and 2015 was $202 and $90 , respectively. During each of the nine months ended June 30, 2016 and 2015, 25,712 and 15,427 shares were committed to be released, respectively, 5,142 of which were released and available for allocation at December 31, 2015 and 2014, respectively, concurrent with the payment of the annual debt service on the ESOP loan. The total ESOP compensation expense recorded for the nine months ended June 30, 2016 and 2015 was $485 and $288 , respectively. The ESOP shares as of June 30, 2016 and September 30, 2015 were as follows (in thousands, except share data): June 30, 2016 September 30, 2015 Allocated shares to active participants 52,861 34,132 Shares committed to be released 20,570 15,428 Unallocated shares 329,123 354,835 Total ESOP shares 402,554 404,395 Fair value of unallocated shares $ 6,418 $ 6,323 Equity Compensation Plans The following table summarizes the impact of the Company's share-based payment plans in the financial statements for the periods shown: Three Months Ended June 30, Nine Months Ended June 30, 2016 2015 2016 2015 Total cost of stock grant plan during the period $ 152 $ 154 $ 454 $ 464 Total cost of stock option plan during the period 59 46 174 138 Total cost of share-based payment plans during the period $ 211 $ 200 $ 628 602 Amount of related income tax benefit recognized in income $ 83 $ 78 $ 246 $ 236 The Company adopted the Westbury Bancorp Inc 2014 Equity Incentive Plan (the "Plan") in 2014. In June 2014, the Company's stockholders approved the Plan which authorized the issuance under the Plan of up to 203,665 restricted stock awards and up to 509,162 stock options. As of June 30, 2016 there were 3,092 restricted stock awards and 15,495 options available for future grants under the Plan. Annual equity-based incentive awards are typically granted to selected officers and employees mid-year. Options are granted with an exercise price equal to no less than the market price of the Company's common shares at the date of grant: those option awards generally vest pro-rata over five years of service and have 10 -year contractual terms. Restricted shares typically vest pro-rata over a five year period. Equity awards may also be granted at other times throughout the year in connection with the recruitment and retention of officers and employees. ASC Topic 718 requires that the grant date fair value of equity awards to employees be recognized as compensation expense over the period during which an employee is required to provide service in exchange for such award. The following table summarizes stock options outstanding for the three and nine months ended June 30, 2016: Number of Options Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) Options outstanding as of March 31, 2016 404,111 $ 15.69 Granted 87,939 19.86 Exercised 159 15.20 Expired or canceled — — Forfeited 2,681 16.23 Options outstanding as of June 30, 2016 489,210 $ 16.44 8.55 $ 1,673 Options exercisable as of June 30, 2016 139,355 $ 15.45 8.11 $ 615 Number of Options Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) Options outstanding as of September 30, 2015 406,409 $ 15.68 Granted 89,939 19.86 Exercised 4,457 15.20 Expired or canceled — — Forfeited 2,681 16.23 Options outstanding as of June 30, 2016 489,210 $ 16.44 8.55 $ 1,673 Options exercisable as of June 30, 2016 139,355 $ 15.45 8.11 $ 615 The fair value of each option award is estimated on the date of grant using the Black-Scholes option pricing model based on certain assumptions made by Company management. Expected volatility is based on historical volatility and the expectations of future volatility of Company shares. The risk free interest rate for periods within the contractual term of the option is based on the U.S. Treasury yield curve in effect at the time of the grant. The expected life of options is estimated at the midpoint of full vesting and contractual life given the limited amount of information available regarding historical employee behavior and represents the period of time that options granted are expected to remain outstanding. The following assumptions were used for options granted during the nine months ended June 30: 2016 2015 Risk-free interest rate 1.28 % 2.10 % Expected volatility of Company's stock 11.08 % 7.44 % Expected dividend yield — % — % Expected life of options (years) 7.5 7.5 Weighted average fair value per option of options granted during the period $ 3.30 $ 2.95 The total intrinsic value of options exercised during each of the nine months ended June 30, 2016 and 2015 was $11 and $0 , respectively. The total intrinsic value of options exercised during each of the three months ended June 30, 2016 and 2015 was $1 and $0 , respectively. The following is a summary of changes in restricted shares for the three and nine months ended June 30, 2016: Number of Shares Weighted Average Grant Date Fair Value Shares Outstanding at March 31, 2016 160,052 $ 15.23 Granted — — Vested 39,503 15.20 Forfeited — — Shares Outstanding at June 30, 2016 120,549 $ 15.25 Number of Shares Weighted Average Grant Date Fair Value Shares Outstanding at September 30, 2015 158,052 $ 15.20 Granted 2,000 18.00 Vested 39,503 15.20 Forfeited — — Shares Outstanding at June 30, 2016 120,549 $ 15.25 The total intrinsic value of restricted shares that vested during the three and nine months ended June 30, 2016 and 2015 was $785 and $703 , respectively. As of June 30, 2016, there was $3.0 million of total unrecognized compensation cost related to nonvested share-based compensation arrangements (including share option and nonvested share awards) granted under the Plan. At June 30, 2016, the weighted-average period over which the unrecognized compensation expense is expected to be recognized was approximately 3.3 years.

Compensation Equity Plans

Compensation Equity Plans	9 Months Ended
	Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Compensation Equity Plans	Employee Stock Ownership Plan The Bank maintains a leveraged employee stock ownership plan ("ESOP") that covers all employees meeting certain minimum age and service requirements. The ESOP was established in conjunction with the Company's stock offering completed in April 2013 and operates on a plan year ending December 31. The ESOP initially borrowed $4.1 million from the Company and used those funds to acquire 411,403 shares, or 8.0% of the total number of shares issued by the Company in its initial public offering. The shares were acquired at a price of $10.00 per share. The Bank makes annual contributions to the ESOP equal to the ESOP's debt service. Additional principal payments, which serve to pay down the debt and accelerate the release of ESOP shares, may be made by the Bank at the discretion of its Board of Directors. The ESOP shares were pledged as collateral for its debt obligations to the Company. As the debt is repaid, shares are released from collateral and allocated to active participants, based on the proportion of debt service paid in the year. The debt repayment and release of shares generally occurs at December 31, the plan year end date. The Company accounts for its ESOP in accordance with ASC 718-40. Accordingly, because the debt is intercompany, it is eliminated in consolidation for presentation in these financial statements. The shares pledged as collateral are reported as unearned ESOP shares in the accompanying balance sheet. Total ESOP shares may be reduced as a result of employees leaving the Company as shares that have previously been released to those exiting employees may be removed from the ESOP and transferred to that employee. As shares are committed to be released from collateral, the Company reports compensation expense equal to the current market price of the released shares, and the released shares become outstanding for EPS computations. During each of the three months ended June 30, 2016 and 2015, 10,285 and 5,143 shares were committed to be released, respectively. The total ESOP compensation expense recorded for the three months ended June 30, 2016 and 2015 was $202 and $90 , respectively. During each of the nine months ended June 30, 2016 and 2015, 25,712 and 15,427 shares were committed to be released, respectively, 5,142 of which were released and available for allocation at December 31, 2015 and 2014, respectively, concurrent with the payment of the annual debt service on the ESOP loan. The total ESOP compensation expense recorded for the nine months ended June 30, 2016 and 2015 was $485 and $288 , respectively. The ESOP shares as of June 30, 2016 and September 30, 2015 were as follows (in thousands, except share data): June 30, 2016 September 30, 2015 Allocated shares to active participants 52,861 34,132 Shares committed to be released 20,570 15,428 Unallocated shares 329,123 354,835 Total ESOP shares 402,554 404,395 Fair value of unallocated shares $ 6,418 $ 6,323 Equity Compensation Plans The following table summarizes the impact of the Company's share-based payment plans in the financial statements for the periods shown: Three Months Ended June 30, Nine Months Ended June 30, 2016 2015 2016 2015 Total cost of stock grant plan during the period $ 152 $ 154 $ 454 $ 464 Total cost of stock option plan during the period 59 46 174 138 Total cost of share-based payment plans during the period $ 211 $ 200 $ 628 602 Amount of related income tax benefit recognized in income $ 83 $ 78 $ 246 $ 236 The Company adopted the Westbury Bancorp Inc 2014 Equity Incentive Plan (the "Plan") in 2014. In June 2014, the Company's stockholders approved the Plan which authorized the issuance under the Plan of up to 203,665 restricted stock awards and up to 509,162 stock options. As of June 30, 2016 there were 3,092 restricted stock awards and 15,495 options available for future grants under the Plan. Annual equity-based incentive awards are typically granted to selected officers and employees mid-year. Options are granted with an exercise price equal to no less than the market price of the Company's common shares at the date of grant: those option awards generally vest pro-rata over five years of service and have 10 -year contractual terms. Restricted shares typically vest pro-rata over a five year period. Equity awards may also be granted at other times throughout the year in connection with the recruitment and retention of officers and employees. ASC Topic 718 requires that the grant date fair value of equity awards to employees be recognized as compensation expense over the period during which an employee is required to provide service in exchange for such award. The following table summarizes stock options outstanding for the three and nine months ended June 30, 2016: Number of Options Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) Options outstanding as of March 31, 2016 404,111 $ 15.69 Granted 87,939 19.86 Exercised 159 15.20 Expired or canceled — — Forfeited 2,681 16.23 Options outstanding as of June 30, 2016 489,210 $ 16.44 8.55 $ 1,673 Options exercisable as of June 30, 2016 139,355 $ 15.45 8.11 $ 615 Number of Options Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) Options outstanding as of September 30, 2015 406,409 $ 15.68 Granted 89,939 19.86 Exercised 4,457 15.20 Expired or canceled — — Forfeited 2,681 16.23 Options outstanding as of June 30, 2016 489,210 $ 16.44 8.55 $ 1,673 Options exercisable as of June 30, 2016 139,355 $ 15.45 8.11 $ 615 The fair value of each option award is estimated on the date of grant using the Black-Scholes option pricing model based on certain assumptions made by Company management. Expected volatility is based on historical volatility and the expectations of future volatility of Company shares. The risk free interest rate for periods within the contractual term of the option is based on the U.S. Treasury yield curve in effect at the time of the grant. The expected life of options is estimated at the midpoint of full vesting and contractual life given the limited amount of information available regarding historical employee behavior and represents the period of time that options granted are expected to remain outstanding. The following assumptions were used for options granted during the nine months ended June 30: 2016 2015 Risk-free interest rate 1.28 % 2.10 % Expected volatility of Company's stock 11.08 % 7.44 % Expected dividend yield — % — % Expected life of options (years) 7.5 7.5 Weighted average fair value per option of options granted during the period $ 3.30 $ 2.95 The total intrinsic value of options exercised during each of the nine months ended June 30, 2016 and 2015 was $11 and $0 , respectively. The total intrinsic value of options exercised during each of the three months ended June 30, 2016 and 2015 was $1 and $0 , respectively. The following is a summary of changes in restricted shares for the three and nine months ended June 30, 2016: Number of Shares Weighted Average Grant Date Fair Value Shares Outstanding at March 31, 2016 160,052 $ 15.23 Granted — — Vested 39,503 15.20 Forfeited — — Shares Outstanding at June 30, 2016 120,549 $ 15.25 Number of Shares Weighted Average Grant Date Fair Value Shares Outstanding at September 30, 2015 158,052 $ 15.20 Granted 2,000 18.00 Vested 39,503 15.20 Forfeited — — Shares Outstanding at June 30, 2016 120,549 $ 15.25 The total intrinsic value of restricted shares that vested during the three and nine months ended June 30, 2016 and 2015 was $785 and $703 , respectively. As of June 30, 2016, there was $3.0 million of total unrecognized compensation cost related to nonvested share-based compensation arrangements (including share option and nonvested share awards) granted under the Plan. At June 30, 2016, the weighted-average period over which the unrecognized compensation expense is expected to be recognized was approximately 3.3 years.

Condensed Parent Company Financ

Condensed Parent Company Financial Information	9 Months Ended
	Jun. 30, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Parent Company Financial Information	Condensed Parent Company Financial Information The condensed financial statements of Westbury Bancorp, Inc. (parent company only) are presented for the periods indicated below: Balance Sheets June 30, September 30, 2016 2015 Assets Cash and interest bearing deposits $ 34 $ 1,440 Investments 64 115 Loan to ESOP 3,620 3,778 Investment in subsidiary 75,548 74,201 Other assets 2,595 2,660 Total assets $ 81,861 $ 82,194 Liabilities and Stockholders' Equity Total liabilities $ 40 $ 157 Stockholders' equity 81,821 82,037 Total liabilities and stockholders' equity $ 81,861 $ 82,194 Statements of Operations Three Months Ended June 30, Nine Months Ended June 30, 2016 2015 2016 2015 Interest and other income $ 34 $ 35 $ 99 $ 161 Interest and other expense 120 199 371 548 Loss before income tax benefit and equity in undistributed net income of subsidiary (86 ) (164 ) (272 ) (387 ) Income tax benefit (17 ) (46 ) (56 ) (100 ) Loss before equity in undistributed net income of subsidiary (69 ) (118 ) (216 ) (287 ) Equity in undistributed net income of subsidiary 975 228 3,034 1,328 Net income $ 906 $ 110 $ 2,818 $ 1,041 Statements of Cash Flows For Nine Months Ended June 30, 2016 2015 Cash Flows From Operating Activities Net income $ 2,818 $ 1,041 Adjustments to reconcile net income to net cash provided by (used in) operating activities: Equity in undistributed net income of subsidiary (3,034 ) (1,328 ) Net change in other liabilities (117 ) 229 Net change in other assets 692 (48 ) Net cash provided by (used in) operating activities 359 (106 ) Cash Flows From Investing Activities Purchase of securities — (728 ) Sales and maturities of securities 51 6,879 Payments received on ESOP loan 158 153 Dividend received from bank subsidiary 2,300 — Net cash provided by investing activities 2,509 6,304 Cash Flows From Financing Activities Stock options exercised 68 — Repurchase of common stock (4,342 ) (11,379 ) Net cash used in financing activities (4,274 ) (11,379 ) Net decrease in cash (1,406 ) (5,181 ) Cash Beginning of period 1,440 6,878 End of period $ 34 $ 1,697

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Schedule of calculated earnings per share, basic and diluted	The following table presents a reconciliation of the number of shares used in the calculation of basic and diluted earnings per common share (in thousands, except share and per share data). Three Months Ended June 30, Nine Months Ended June 30, 2016 2015 2016 2015 Net income $ 906 $ 110 $ 2,818 $ 1,041 Basic potential common shares: Weighted average shares outstanding 3,961,643 4,264,273 4,054,921 4,585,717 Weighted average unallocated ESOP shares (335,982 ) (363,407 ) (345,153 ) (368,568 ) Basic weighted average shares outstanding 3,625,661 3,900,866 3,709,768 4,217,149 Dilutive effect of equity awards 43,580 9,081 33,525 — Diluted weighted average shares outstanding 3,669,241 3,909,947 3,743,293 4,217,149 Basic income per share $ 0.25 $ 0.03 $ 0.76 $ 0.25 Diluted income per share $ 0.25 $ 0.03 $ 0.75 $ 0.25

Investment Securitites (Tables)

Investment Securitites (Tables)	9 Months Ended
	Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Schedule of amortized costs and fair values of securities available-for-sale	The amortized cost and fair value of investment securities are summarized as follows: June 30, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available for Sale U.S. Government and agency securities $ 24 $ 1 $ — $ 25 U.S. Government agency residential mortgage-backed securities 35,882 646 (31 ) 36,497 U.S. Government agency collateralized mortgage obligations 2,782 36 (15 ) 2,803 U.S. Government agency commercial mortgage-backed securities 12,226 165 (9 ) 12,382 Municipal securities-tax exempt 16,033 170 (6 ) 16,197 Municipal securities-taxable 14,846 499 (1 ) 15,344 Corporate securities 3,873 133 — 4,006 Total Available for Sale 85,666 1,650 (62 ) 87,254 Held to Maturity Municipal securities-tax exempt 2,293 100 — 2,393 Total Investment Securities $ 87,959 $ 1,750 $ (62 ) $ 89,647 September 30, 2015 Amortized Gross Gross Fair Available for Sale U.S. Government and agency securities $ 24 $ 1 $ — $ 25 U.S. Government agency residential mortgage-backed securities 39,380 456 (144 ) 39,692 U.S. Government agency collateralized mortgage obligations 1,963 18 (40 ) 1,941 U.S. Government agency commercial mortgage-backed securities 13,993 121 (15 ) 14,099 Municipal securities-tax exempt 2,209 7 (15 ) 2,201 Municipal securities-taxable 19,285 215 (34 ) 19,466 Corporate securities 2,852 12 (2 ) 2,862 Total Available for Sale 79,706 830 (250 ) 80,286 Held to Maturity Municipal securities-tax exempt 2,459 31 — 2,490 Total Investment Securities $ 82,165 $ 861 $ (250 ) $ 82,776
Schedule of amortized cost and estimated fair value of investment securities by contractual maturity	The amortized cost and fair value of investment securities, by contractual maturity, at June 30, 2016 are shown in the following table. Actual maturities differ from contractual maturities for mortgage-backed securities because the mortgages underlying the securities may be called or repaid without penalty. Therefore, these securities are not presented in the maturity categories in the table below. June 30, 2016 Amortized Cost Fair Value Available for sale: Due in one year or less $ 86 $ 86 Due after one year through five years 10,268 10,509 Due after five years through ten years 19,918 20,378 Due after ten years 4,504 4,599 U.S. Government agency collateralized mortgage obligations 2,782 2,803 U.S. Government agency residential mortgage-backed securities 35,882 36,497 U.S. Government agency commercial mortgage-backed securities 12,226 12,382 85,666 87,254 Held to maturity: Due in one year or less 168 168 Due after one year through five years 703 718 Due after five years through ten years 982 1,039 Due after ten years 440 468 2,293 2,393 Total $ 87,959 $ 89,647
Schedule of investment securities in an unrealized loss position	Information pertaining to securities with gross unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, are summarized as follows: June 30, 2016 Less than 12 Months 12 Months or Longer Total Fair Value Unrealized Loss Fair Unrealized Fair Unrealized U.S. Government and agency securities $ — $ — $ — $ — $ — $ — U.S. Government agency residential mortgage-backed securities 2,544 — 3,309 (31 ) 5,853 (31 ) U.S. Government agency collateralized mortgage obligations — — 598 (15 ) 598 (15 ) U.S Government agency commercial mortgage-backed securities 5,022 (9 ) — — 5,022 (9 ) Municipal securities-Tax exempt 3,024 (6 ) — — 3,024 (6 ) Municipal securities-Taxable 301 (1 ) — — 301 (1 ) Corporate securities — — — — — — $ 10,891 $ (16 ) $ 3,907 $ (46 ) $ 14,798 $ (62 ) September 30, 2015 Less than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized U.S. Government and agency securities $ — $ — $ — $ — $ — $ — U.S. Government agency residential mortgage-backed securities 7,270 (59 ) 6,168 (85 ) 13,438 (144 ) U.S. Government agency collateralized mortgage obligations — — 627 (40 ) 627 (40 ) U.S. Government agency commercial mortgage-backed securities 3,511 (15 ) — — 3,511 (15 ) Municipal securities-Tax exempt 1,027 (15 ) — — 1,027 (15 ) Municipal securities-Taxable 2,634 (30 ) 151 (4 ) 2,785 (34 ) Corporate securities 510 (2 ) — — 510 (2 ) $ 14,952 $ (121 ) $ 6,946 $ (129 ) $ 21,898 $ (250 )

Loans (Tables)

Loans (Tables)	9 Months Ended
	Jun. 30, 2016
Loans
Summary of balances of loans	A summary of the balances of loans as of the dates indicated follows: June 30, 2016 September 30, Real estate: Single family $ 153,613 $ 153,141 Multifamily 123,799 105,750 Commercial real estate 174,955 162,957 Construction and land development 16,949 18,831 Total real estate 469,316 440,679 Commercial business 36,501 38,200 Consumer: Home equity lines of credit 14,758 14,881 Education 3,511 4,106 Other 505 523 Total consumer 18,774 19,510 Total loans 524,591 498,389 Less: Net deferred loan fees 197 366 Allowance for loan losses 5,062 4,598 Net loans $ 519,332 $ 493,425
Schedule of contractual aging of recorded investment in past due loans	The following tables present the contractual aging of the Company's recorded investment in past due loans by class of loans as of June 30, 2016 and September 30, 2015: June 30, 2016 Current 30-59 Days Past Due 60-89 Days Past Due Loans Past or More Total Single family $ 152,975 $ 415 $ — $ 223 $ 153,613 Multifamily 123,799 — — — 123,799 Commercial real estate 174,955 — — — 174,955 Construction and land development 16,949 — — — 16,949 Commercial business 36,501 — — — 36,501 Consumer and other: Home equity lines of credit 14,731 — — 27 14,758 Education 3,410 29 7 65 3,511 Other 505 — — — 505 $ 523,825 $ 444 $ 7 $ 315 $ 524,591 September 30, 2015 Current 30-59 Days Past Due 60-89 Days Past Due Loans Past or More Total Single family $ 152,245 $ 473 $ 83 $ 340 $ 153,141 Multifamily 105,750 — — — 105,750 Commercial real estate 162,957 — — — 162,957 Construction and land development 18,827 4 — — 18,831 Commercial business 38,200 — — — 38,200 Consumer and other: Home equity lines of credit 14,691 — — 190 14,881 Education 3,782 79 — 245 4,106 Other 523 — — — 523 $ 496,975 $ 556 $ 83 $ 775 $ 498,389
Schedule of risk category of loans	The following tables present the risk category of loans evaluated by internal asset classification based on the most recent analysis performed by the Company and the contractual aging as of June 30, 2016 and September 30, 2015: June 30, 2016 Pass Watch Special Mention Substandard Doubtful Total Single family $ 150,922 $ 750 $ — $ 1,941 $ — $ 153,613 Multifamily 122,032 1,767 — — — 123,799 Commercial real estate 170,811 3,745 399 — — 174,955 Construction and land development 16,947 — — 2 — 16,949 Commercial business 32,087 4,194 220 — — 36,501 Consumer and other: Home equity lines of credit 14,621 — — 137 — 14,758 Education 3,511 — — — — 3,511 Other 505 — — — — 505 Total $ 511,436 $ 10,456 $ 619 $ 2,080 $ — $ 524,591 September 30, 2015 Pass Watch Special Mention Substandard Doubtful Total Single family $ 150,421 $ 1,135 $ — $ 1,585 $ — $ 153,141 Multifamily 103,117 2,633 — — — 105,750 Commercial real estate 159,104 3,136 410 307 — 162,957 Construction and land development 18,831 — — — — 18,831 Commercial business 36,561 — — 1,639 — 38,200 Consumer and other: Home equity lines of credit 14,636 — — 245 — 14,881 Education 4,106 — — — — 4,106 Other 523 — — — — 523 $ 487,299 $ 6,904 $ 410 $ 3,776 $ — $ 498,389
Schedule of activity in the allowance for loan losses, by portfolio segment	The following tables provide additional detail of the activity in the allowance for loan losses, by portfolio segment, for the three months ended June 30, 2016 and 2015: Three Months Ended June 30, 2016 Single Family Multifamily Commercial Real Estate Construction and Land Development Commercial Business Consumer and Other Total Allowance for loan losses: Beginning balance $ 1,058 $ 1,180 $ 1,801 $ 335 $ 420 $ 69 $ 4,863 Provision for loan losses (7 ) 23 233 (8 ) 5 4 250 Loans charged-off (59 ) — — — — — (59 ) Recoveries — — — — 7 1 8 Ending balance $ 992 $ 1,203 $ 2,034 $ 327 $ 432 $ 74 $ 5,062 Period-ended amount allocated for: Individually evaluated for impairment $ 1 $ — $ — $ — $ — $ 53 $ 54 Collectively evaluated for impairment 991 1,203 2,034 327 432 21 5,008 Ending balance $ 992 $ 1,203 $ 2,034 $ 327 $ 432 $ 74 $ 5,062 Loans: Individually evaluated for impairment $ 1,740 $ 1,767 $ — $ — $ — $ 90 $ 3,597 Collectively evaluated for impairment 151,873 122,032 174,955 16,949 36,501 18,684 520,994 Ending balance $ 153,613 $ 123,799 $ 174,955 $ 16,949 $ 36,501 $ 18,774 $ 524,591 Three Months Ended Single Family Multifamily Commercial Construction and Commercial Consumer Total Allowance for loan losses: Beginning balance $ 1,064 $ 1,025 $ 1,507 $ 361 $ 415 $ 111 $ 4,483 Provision for loan losses 7 22 45 7 37 32 150 Loans charged-off (28 ) — (53 ) — — (24 ) (105 ) Recoveries 1 — 1 — 4 2 8 Ending balance $ 1,044 $ 1,047 $ 1,500 $ 368 $ 456 $ 121 $ 4,536 Period-ended amount allocated for: Individually evaluated for impairment $ 40 $ — $ — $ — $ — $ 56 $ 96 Collectively evaluated for impairment 1,004 1,047 1,500 368 456 65 4,440 Ending balance $ 1,044 $ 1,047 $ 1,500 $ 368 $ 456 $ 121 $ 4,536 Loans: Individually evaluated for impairment $ 1,578 $ 1,853 $ — $ — $ — $ 226 $ 3,657 Collectively evaluated for impairment 149,951 97,097 158,861 23,013 39,863 18,937 487,722 Ending balance $ 151,529 $ 98,950 $ 158,861 $ 23,013 $ 39,863 $ 19,163 $ 491,379 The following tables provide additional detail of the activity in the allowance for loan losses, by portfolio segment, for the nine months ended June 30, 2016 and 2015: Nine Months Ended June 30, 2016 Single Family Multifamily Commercial Real Estate Construction and Land Development Commercial Business Consumer and Other Total Allowance for loan losses: Beginning balance $ 1,073 $ 1,013 $ 1,604 $ 330 $ 498 $ 80 $ 4,598 Provision for loan losses (5 ) 190 428 (3 ) (82 ) (3 ) 525 Loans charged-off (89 ) — — — — (10 ) (99 ) Recoveries 13 — 2 — 16 7 38 Ending balance $ 992 $ 1,203 $ 2,034 $ 327 $ 432 $ 74 $ 5,062 Period-ended amount allocated for: Individually evaluated for impairment $ 1 $ — $ — $ — $ — $ 53 $ 54 Collectively evaluated for impairment 991 1,203 2,034 327 432 21 5,008 Ending Balance $ 992 $ 1,203 $ 2,034 $ 327 $ 432 $ 74 $ 5,062 Loans: Individually evaluated for impairment $ 1,740 $ 1,767 $ — $ — $ — $ 90 $ 3,597 Collectively evaluated for impairment 151,873 122,032 174,955 16,949 36,501 18,684 520,994 Ending Balance $ 153,613 $ 123,799 $ 174,955 $ 16,949 $ 36,501 $ 18,774 $ 524,591 Nine Months Ended Single Family Multifamily Commercial Construction and Commercial Consumer Total Allowance for loan losses: Beginning balance $ 1,072 $ 757 $ 1,412 $ 301 $ 454 $ 76 $ 4,072 Provision for loan losses 196 290 184 67 1 62 800 Loans charged-off (236 ) — (115 ) — (14 ) (26 ) (391 ) Recoveries 12 — 19 — 15 9 55 Ending balance $ 1,044 $ 1,047 $ 1,500 $ 368 $ 456 $ 121 $ 4,536 Period-ended amount allocated for: Individually evaluated for impairment $ 40 $ — $ — $ — $ — $ 56 $ 96 Collectively evaluated for impairment 1,004 1,047 1,500 368 456 65 4,440 Ending balance $ 1,044 $ 1,047 $ 1,500 $ 368 $ 456 $ 121 $ 4,536 Loans: Individually evaluated for impairment $ 1,578 $ 1,853 $ — $ — $ — $ 226 $ 3,657 Collectively evaluated for impairment 149,951 97,097 158,861 23,013 39,863 18,937 487,722 Ending balance $ 151,529 $ 98,950 $ 158,861 $ 23,013 $ 39,863 $ 19,163 $ 491,379
Schedule of impaired loans	Three months ended Nine months ended June 30, 2016 Unpaid Principal Balance Recorded Investment Allowance for Loan Losses Allocated Average Recorded Investment Interest Income Recognized Average Interest With no related allowance recorded: Single family $ 1,601 $ 1,430 $ — $ 1,428 $ 18 $ 1,308 $ 55 Multifamily 1,824 1,767 — 1,778 19 1,801 57 Commercial real estate — — — — — — — Construction and land development 4 — — — — — — Commercial business — — — — — — — Consumer and other 115 37 — 38 — 71 — With an allowance recorded: Single family 310 310 1 311 3 361 11 Multifamily — — — — — — — Commercial real estate — — — — — — — Construction and land development — — — — — — — Commercial business — — — — — — — Consumer and other 53 53 53 54 1 54 2 $ 3,907 $ 3,597 $ 54 $ 3,609 $ 41 $ 3,595 $ 125 Three months ended Nine months ended June 30, 2015 Unpaid Principal Balance Recorded Investment Allowance for Loan Losses Allocated Average Recorded Investment Interest Income Recognized Average Interest With no related allowance recorded: Single family $ 1,376 $ 1,263 $ — $ 1,315 $ 13 $ 1,298 $ 36 Multifamily 1,941 1,853 — 1,864 20 1,884 60 Commercial real estate — — — 543 — 527 — Construction and land development — — — — — — — Commercial business — — — — — — — Consumer and other 272 170 — 196 — 210 — With an allowance recorded: Single family 315 315 40 316 4 336 11 Multifamily — — — — — — — Commercial real estate — — — — — 41 — Construction and land development — — — — — — — Commercial business — — — — — — — Consumer and other 56 56 56 57 1 57 2 $ 3,960 $ 3,657 $ 96 $ 4,291 $ 38 $ 4,353 $ 109
Schedule of loans modified in a TDR, by class
Schedule of Loans and Leases Receivable, Related Parties	An analysis of such loans is as follows: Nine Months Ended June 30, 2016 Balance, beginning $ 3,334 New loans originated 927 Draws on lines of credit 157 Principal repayments (993 ) Other 1 369 Balance, ending $ 3,794 1 Officer, with existing loan, was promoted to executive officer position during the period.
Past due loans
Loans
Schedule of recorded investment by accrual status	The following table presents the recorded investment in nonaccrual loans by class of loans as of June 30, 2016 and September 30, 2015: June 30, 2016 September 30, 2015 Single family $ 453 $ 340 Multifamily — — Commercial real estate — — Construction and land development — — Commercial business — — Consumer and other: Home equity lines of credit 37 203 Education 72 260 Other — — $ 562 $ 803
Troubled debt restructurings
Loans
Schedule of recorded investment by accrual status	The following is a summary of troubled debt restructured loans (TDRs) at June 30, 2016 and September 30, 2015: June 30, 2016 September 30, 2015 Troubled debt restructurings - accrual $ 3,050 $ 3,134 Troubled debt restructurings - nonaccrual — — $ 3,050 $ 3,134

Deposits (Tables)

Deposits (Tables)	9 Months Ended
	Jun. 30, 2016
Deposits [Abstract]
Schedule of composition of deposits	The following table presents the composition of deposits as of: June 30, 2016 September 30, 2015 Amount Percent Amount Percent Checking Accounts: Noninterest bearing $ 106,551 18.91 % $ 101,486 19.11 % Interest bearing 132,676 23.54 % 131,968 24.85 % 239,227 42.45 % 233,454 43.96 % Passbook and Statement Savings 133,754 23.74 % 127,431 24.00 % Variable Rate Money Market Accounts 58,168 10.32 % 47,876 9.02 % Certificates of Deposit 132,366 23.49 % 122,259 23.02 % $ 563,515 100.00 % $ 531,020 100.00 %

Regulatory Capital (Tables)

Regulatory Capital (Tables)	9 Months Ended
	Jun. 30, 2016
Regulatory Capital Requirements [Abstract]
Schedule of actual capital amounts and ratios and those required by the above regulatory standards	The Bank’s actual capital amounts and ratios and those required by the regulatory standards are presented in the following tables. For June 30, 2016, we have included the 0.625% increase for 2016 in our minimum capital adequacy ratios in the table below. At June 30, 2016 Actual For Capital Adequacy Purposes For Capital Adequacy Purposes with Capital Buffer To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Ratio Amount Ratio Amount Ratio Amount Ratio CETI capital (to risk-weighted assets) - Westbury Bank $ 67,298 12.08 % $ 25,069 4.50 % 28,551 5.125 % $ 36,211 6.50 % Tier 1 capital (to risk-weighted assets) - Westbury Bank 67,298 12.08 % 33,425 6.00 % 36,907 6.625 % 44,567 8.00 % Total capital (to risk-weighted assets) - Westbury Bank 72,360 12.99 % 44,567 8.00 % 48,049 8.625 % 55,709 10.00 % Leverage (to adjusted total assets) - Westbury Bank 67,298 9.87 % 27,274 4.00 % N/A N/A 34,092 5.00 % At September 30, 2015 Actual For Capital Adequacy To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Ratio Amount Ratio Amount Ratio CET1 capital (to risk-weighted assets) - Westbury Bank $ 64,155 12.25 % $ 23,567 4.50 % $ 34,041 6.50 % Tier 1 capital (to risk-weighted assets) - Westbury Bank 64,155 12.25 % 31,423 6.00 % 41,897 8.00 % Total capital (to risk-weighted assets) - Westbury Bank 68,753 13.12 % 41,923 8.00 % 52,403 10.00 % Leverage (to adjusted total assets) - Westbury Bank 64,155 10.01 % 25,636 4.00 % 32,045 5.00 %
Schedule of reconciliation of the Bank's stockholders' equity to regulatory capital	The following table reconciles the Bank’s stockholder's equity to regulatory capital as of June 30, 2016 and September 30, 2015: June 30, 2016 September 30, 2015 Stockholder's equity of the Bank $ 72,808 $ 70,976 Less: Unrealized gain on securities (965 ) (352 ) Disallowed investment in subsidiary (3,296 ) (3,296 ) Disallowed deferred tax assets (1,249 ) (3,173 ) Tier 1, CETI and leverage capital 67,298 64,155 Plus: Allowable general valuation allowances 5,062 4,598 Total capital $ 72,360 $ 68,753

Commitments (Tables)

Commitments (Tables)	9 Months Ended
	Jun. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Schedule of financial instruments whose contract amounts represent credit risk	he following instruments were outstanding, whose contract amounts represent credit risk as of the dates noted below: June 30, 2016 September 30, 2015 Commitments to extend mortgage credit: Fixed rate $ 11,305 $ 8,443 Adjustable rate 314 9,929 Unused commercial loan lines of credit 90,752 54,225 Unused home equity line of credit 27,034 26,164 Standby letters of credit 574 884 Commitment to sell loans 2,187 431

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Schedule of assets and liabilities measured at fair value on a recurring basis	The following table summarizes financial instruments measured at fair value on a recurring basis, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value as of the dates indicated below: Fair Value Measurements June 30, 2016 Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Other Unobservable Inputs (Level 3) Assets Securities available-for-sale U.S. Government and agency securities $ 25 $ — $ 25 $ — U.S. Government agency residential mortgage-backed securities 36,497 — 36,497 — U.S. Government agency collateralized mortgage obligations 2,803 — 2,803 — U.S. Government agency commercial mortgage-backed securities 12,382 — 12,382 — Municipal securities-tax exempt 16,197 — 16,197 — Municipal securities-taxable 15,344 — 15,344 — Corporate securities 4,006 — 4,006 — Total securities available-for-sale $ 87,254 $ — $ 87,254 $ — Derivatives $ 97 $ — $ 97 $ — Liabilities Derivatives $ 97 $ — $ 97 $ — Fair Value Measurements September 30, 2015 Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Other Assets Securities available-for-sale U.S. Government and agency securities $ 25 $ — $ 25 $ — U.S. Government agency residential mortgage-backed securities 39,692 — 39,692 — U.S. Government agency collateralized mortgage obligations 1,941 — 1,941 — U.S. Government agency commercial mortgage-backed securities 14,099 — 14,099 — Municipal securities-tax exempt 2,201 — 2,201 — Municipal securities-taxable 19,466 — 19,466 — Corporate securities 2,862 — 2,862 — Total securities available-for-sale $ 80,286 $ — $ 80,286 $ — Derivatives $ 110 $ — $ 110 $ — Liabilities Derivatives $ 110 $ — $ 110 $ —
Schedule of assets measured at fair value on a nonrecurring basis	Fair Value Measurements June 30, 2016 Total Quoted Prices in Significant Other Significant Other Assets Impaired loans $ 309 $ — $ — $ 309 Foreclosed real estate — — — — Mortgage servicing rights 883 — — 883 Real estate held for sale 717 — — 717 Fair Value Measurements September 30, 2015 Total Quoted Prices in Significant Other Significant Other Assets Impaired loans $ 390 $ — $ — $ 390 Foreclosed real estate 283 — — 283 Mortgage servicing rights 1,210 — — 1,210 Real estate held for sale 882 — — 882
Schedule of estimated fair values and related carrying amounts of the entity's financial instruments	The estimated fair values and related carrying amounts of the Company’s financial instruments as of the dates noted below were as follows: June 30, 2016 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Other Unobservable Inputs (Level 3) Financial assets: Cash and cash equivalents $ 17,817 $ 17,817 $ 17,817 $ — $ — Securities available for sale 87,254 87,254 — 87,254 — Securities held to maturity 2,293 2,393 — 2,393 — Loans, net 519,332 521,999 — — 521,999 Loans held for sale, net 2,187 2,187 — 2,187 — Federal Home Loan Bank stock 1,301 1,301 — — 1,301 Mortgage servicing rights 883 883 — — 883 Accrued interest receivable 2,091 2,091 2,091 — — Derivative asset 97 97 — 97 — Financial liabilities: Deposits 563,515 538,578 106,551 — 432,027 Short-term advances from Federal Home Loan Bank — — — — — Long-term advances from Federal Home Loan Bank 20,000 19,647 — — 19,647 Advance payments by borrowers for property taxes and insurance 3,637 3,637 3,637 — — Accrued interest payable 5 5 5 — — Derivative liability 97 97 — 97 — September 30, 2015 Carrying Estimated Fair Quoted Prices in Significant Other Significant Other Financial assets: Cash and cash equivalents $ 16,488 $ 16,488 $ 16,488 $ — $ — Securities available for sale 80,286 80,286 — 80,286 — Securities held to maturity 2,459 2,490 — 2,490 — Loans, net 493,425 493,480 — — 493,480 Loans held for sale, net 431 431 — 431 — Federal Home Loan Bank stock 3,350 3,350 — — 3,350 Mortgage servicing rights 1,210 1,210 — — 1,210 Accrued interest receivable 1,965 1,965 1,965 — — Derivative asset 110 110 — 110 — Financial liabilities: Deposits 531,020 508,339 101,486 — 406,853 Short-term advances from Federal Home Loan Bank 18,000 18,000 — 18,000 — Long-term advances from Federal Home Loan Bank — — — — — Advance payments by borrowers for property taxes and insurance 5,382 5,382 5,382 — — Accrued interest payable 5 5 5 — — Derivative liability 110 110 — 110 —

Employee Stock Ownership Plan D

Employee Stock Ownership Plan Disclosure of (Tables)	9 Months Ended
	Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Employee Stock Ownership Plan (ESOP) Disclosures	The ESOP shares as of June 30, 2016 and September 30, 2015 were as follows (in thousands, except share data): June 30, 2016 September 30, 2015 Allocated shares to active participants 52,861 34,132 Shares committed to be released 20,570 15,428 Unallocated shares 329,123 354,835 Total ESOP shares 402,554 404,395 Fair value of unallocated shares $ 6,418 $ 6,323

Compensation Equity Plans (Tabl

Compensation Equity Plans (Tables)	9 Months Ended
	Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Allocation of Share-based Compensation Costs by Plan	The following table summarizes the impact of the Company's share-based payment plans in the financial statements for the periods shown: Three Months Ended June 30, Nine Months Ended June 30, 2016 2015 2016 2015 Total cost of stock grant plan during the period $ 152 $ 154 $ 454 $ 464 Total cost of stock option plan during the period 59 46 174 138 Total cost of share-based payment plans during the period $ 211 $ 200 $ 628 602 Amount of related income tax benefit recognized in income $ 83 $ 78 $ 246 $ 236
Schedule of Stock Options Activity	The following table summarizes stock options outstanding for the three and nine months ended June 30, 2016: Number of Options Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) Options outstanding as of March 31, 2016 404,111 $ 15.69 Granted 87,939 19.86 Exercised 159 15.20 Expired or canceled — — Forfeited 2,681 16.23 Options outstanding as of June 30, 2016 489,210 $ 16.44 8.55 $ 1,673 Options exercisable as of June 30, 2016 139,355 $ 15.45 8.11 $ 615 Number of Options Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) Options outstanding as of September 30, 2015 406,409 $ 15.68 Granted 89,939 19.86 Exercised 4,457 15.20 Expired or canceled — — Forfeited 2,681 16.23 Options outstanding as of June 30, 2016 489,210 $ 16.44 8.55 $ 1,673 Options exercisable as of June 30, 2016 139,355 $ 15.45 8.11 $ 615
Schedule of Stock Options Valuation Assumptions	The following assumptions were used for options granted during the nine months ended June 30: 2016 2015 Risk-free interest rate 1.28 % 2.10 % Expected volatility of Company's stock 11.08 % 7.44 % Expected dividend yield — % — % Expected life of options (years) 7.5 7.5 Weighted average fair value per option of options granted during the period $ 3.30 $ 2.95
Schedule of Restricted Stock Units Award Activity	The following is a summary of changes in restricted shares for the three and nine months ended June 30, 2016: Number of Shares Weighted Average Grant Date Fair Value Shares Outstanding at March 31, 2016 160,052 $ 15.23 Granted — — Vested 39,503 15.20 Forfeited — — Shares Outstanding at June 30, 2016 120,549 $ 15.25 Number of Shares Weighted Average Grant Date Fair Value Shares Outstanding at September 30, 2015 158,052 $ 15.20 Granted 2,000 18.00 Vested 39,503 15.20 Forfeited — — Shares Outstanding at June 30, 2016 120,549 $ 15.25

Condensed Parent Company Fina30

Condensed Parent Company Financial Information (Tables)	9 Months Ended
	Jun. 30, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Balance Sheet	The condensed financial statements of Westbury Bancorp, Inc. (parent company only) are presented for the periods indicated below: Balance Sheets June 30, September 30, 2016 2015 Assets Cash and interest bearing deposits $ 34 $ 1,440 Investments 64 115 Loan to ESOP 3,620 3,778 Investment in subsidiary 75,548 74,201 Other assets 2,595 2,660 Total assets $ 81,861 $ 82,194 Liabilities and Stockholders' Equity Total liabilities $ 40 $ 157 Stockholders' equity 81,821 82,037 Total liabilities and stockholders' equity $ 81,861 $ 82,194
Condensed Income Statement	Statements of Operations Three Months Ended June 30, Nine Months Ended June 30, 2016 2015 2016 2015 Interest and other income $ 34 $ 35 $ 99 $ 161 Interest and other expense 120 199 371 548 Loss before income tax benefit and equity in undistributed net income of subsidiary (86 ) (164 ) (272 ) (387 ) Income tax benefit (17 ) (46 ) (56 ) (100 ) Loss before equity in undistributed net income of subsidiary (69 ) (118 ) (216 ) (287 ) Equity in undistributed net income of subsidiary 975 228 3,034 1,328 Net income $ 906 $ 110 $ 2,818 $ 1,041
Condensed Cash Flow Statement	Statements of Cash Flows For Nine Months Ended June 30, 2016 2015 Cash Flows From Operating Activities Net income $ 2,818 $ 1,041 Adjustments to reconcile net income to net cash provided by (used in) operating activities: Equity in undistributed net income of subsidiary (3,034 ) (1,328 ) Net change in other liabilities (117 ) 229 Net change in other assets 692 (48 ) Net cash provided by (used in) operating activities 359 (106 ) Cash Flows From Investing Activities Purchase of securities — (728 ) Sales and maturities of securities 51 6,879 Payments received on ESOP loan 158 153 Dividend received from bank subsidiary 2,300 — Net cash provided by investing activities 2,509 6,304 Cash Flows From Financing Activities Stock options exercised 68 — Repurchase of common stock (4,342 ) (11,379 ) Net cash used in financing activities (4,274 ) (11,379 ) Net decrease in cash (1,406 ) (5,181 ) Cash Beginning of period 1,440 6,878 End of period $ 34 $ 1,697

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net income	$ 906	$ 110	$ 2,818	$ 1,041
Basic potential common shares:
Weighted average shares outstanding (in shares)	3,961,643	4,264,273	4,054,921	4,585,717
Weighted average unallocated ESOP shares (in shares)	(335,982)	(363,407)	(345,153)	(368,568)
Basic weighted average shares outstanding (in shares)	3,625,661	3,900,866	3,709,768	4,217,149
Dilutive potential common shares (in shares)	43,580	9,081	33,525	0
Diluted weighted average shares outstanding (in shares)	3,669,241	3,909,947	3,743,293	4,217,149
Basic loss per share (in dollars per share)	$ 0.25	$ 0.03	$ 0.76	$ 0.25
Diluted loss per share (in dollars per share)	$ 0.25	$ 0.03	$ 0.75	$ 0.25

Investment Securitites (Details

Investment Securitites (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Securities Available for Sale
Amortized Cost	$ 85,666	$ 79,706
Gross Unrealized Gains	1,650	830
Gross Unrealized (Losses)	(62)	(250)
Fair Value	87,254	80,286
Held-to-maturity Securities [Abstract]
Amortized Cost	2,293	2,459
Fair Value	2,393	2,490
Total Investment Securities
Amortized Cost	87,959	82,165
Gross Unrealized Gains	1,750	861
Gross Unrealized Losses	(62)	(250)
Fair Value	89,647	82,776
U.S. Government and agency securities
Securities Available for Sale
Amortized Cost	24	24
Gross Unrealized Gains	1	1
Gross Unrealized (Losses)	0	0
Fair Value	25	25
U.S. Government agency residential mortgage-backed securities
Securities Available for Sale
Amortized Cost	35,882	39,380
Gross Unrealized Gains	646	456
Gross Unrealized (Losses)	(31)	(144)
Fair Value	36,497	39,692
U.S. Government agency collateralized mortgage obligations
Securities Available for Sale
Amortized Cost	2,782	1,963
Gross Unrealized Gains	36	18
Gross Unrealized (Losses)	(15)	(40)
Fair Value	2,803	1,941
U.S. Government agency commercial mortgage-backed securities
Securities Available for Sale
Amortized Cost	12,226	13,993
Gross Unrealized Gains	165	121
Gross Unrealized (Losses)	(9)	(15)
Fair Value	12,382	14,099
Nontaxable Municipal Bonds [Member]
Securities Available for Sale
Amortized Cost	16,033	2,209
Gross Unrealized Gains	170	7
Gross Unrealized (Losses)	(6)	(15)
Fair Value	16,197	2,201
Taxable Municipal Bonds [Member]
Securities Available for Sale
Amortized Cost	14,846	19,285
Gross Unrealized Gains	499	215
Gross Unrealized (Losses)	(1)	(34)
Fair Value	15,344	19,466
Corporate Debt Securities [Member]
Securities Available for Sale
Amortized Cost	3,873	2,852
Gross Unrealized Gains	133	12
Gross Unrealized (Losses)	0	(2)
Fair Value	4,006	2,862
Municipal securities
Held-to-maturity Securities [Abstract]
Amortized Cost	2,293	2,459
Gross Unrealized Gains	100	31
Gross Unrealized Losses	0	0
Fair Value	$ 2,393	$ 2,490

Investment Securitites (Detai33

Investment Securitites (Details 2) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Sep. 30, 2015
Available for Sale, Amortized Cost
Due in one year or less	$ 86,000		$ 86,000
Due after one year through five years	10,268,000		10,268,000
Due after five years through ten years	19,918,000		19,918,000
Due after ten years	4,504,000		4,504,000
Total	85,666,000		85,666,000
Available for Sale, Fair Value
Due in one year or less	86,000		86,000
Due after one year through five years	10,509,000		10,509,000
Due after five years through ten years	20,378,000		20,378,000
Due after ten years	4,599,000		4,599,000
Fair Value	87,254,000		87,254,000		$ 80,286,000
Other disclosures
Proceeds from sales of securities available-for-sale	15,482,000	$ 5,672,000	24,222,000	$ 23,208,000
Gross realized gains on the sale of securities available-for-sale	211,000	41,000	234,000	166,000
Gross realized losses on the sale of securities available-for-sale	1,000	$ 24,000	13,000	$ 76,000
Securities pledged to secure treasury, tax, and loan deposits and other purposes	4,445,000		4,445,000		0
Held to maturity, Amortized Cost
Due in one year or less	168,000		168,000
Due after one year through five years	703,000		703,000
Due after five years through ten years	982,000		982,000
Due after five years through ten years	440,000		440,000
Amortized Cost	2,293,000		2,293,000		2,459,000
Amortized Cost	87,959,000		87,959,000		82,165,000
Held to maturity, Fair Value
Due in one year or less	168,000		168,000
Due after one year through five years	718,000		718,000
Due after five years through ten years	1,039,000		1,039,000
Due after ten years	468,000		468,000
Fair Value	2,393,000		2,393,000		2,490,000
Investment Securities	89,647,000		89,647,000		82,776,000
U.S. Government agency collateralized mortgage obligations
Available for Sale, Amortized Cost
U.S. Government agency securities	2,782,000		2,782,000
Available for Sale, Fair Value
U.S. Government agency securities	2,803,000		2,803,000
Fair Value	2,803,000		2,803,000		1,941,000
U.S. Government agency residential mortgage-backed securities
Available for Sale, Amortized Cost
U.S. Government agency securities	35,882,000		35,882,000
Available for Sale, Fair Value
U.S. Government agency securities	36,497,000		36,497,000
Fair Value	36,497,000		36,497,000		39,692,000
U.S. Government agency commercial mortgage-backed securities
Available for Sale, Amortized Cost
U.S. Government agency securities	12,226,000		12,226,000
Available for Sale, Fair Value
U.S. Government agency securities	12,382,000		12,382,000
Fair Value	$ 12,382,000		$ 12,382,000		$ 14,099,000

Investment Securitites (Detai34

Investment Securitites (Details 3) $ in Thousands	Jun. 30, 2016USD ($)security	Sep. 30, 2015USD ($)security
Total temporary impaired securities
Less than 12 months, Fair Value	$ 10,891	$ 14,952
Less than 12 months, Unrealized Losses	(16)	(121)
12 months or longer, Fair Value	3,907	6,946
12 months or longer, Unrealized Losses	(46)	(129)
Total, Fair Value	14,798	21,898
Total, Unrealized Losses	$ (62)	$ (250)
Number of securities in an unrealized loss position, greater than twelve months | security	5	9
Number of securities in an unrealized loss position, less than twelve months | security	17	22
U.S. Government and agency securities
Total temporary impaired securities
Less than 12 months, Fair Value	$ 0	$ 0
Less than 12 months, Unrealized Losses	0	0
12 months or longer, Fair Value	0	0
12 months or longer, Unrealized Losses	0	0
Total, Fair Value	0	0
Total, Unrealized Losses	0	0
U.S. Government agency residential mortgage-backed securities
Total temporary impaired securities
Less than 12 months, Fair Value	2,544	7,270
Less than 12 months, Unrealized Losses	0	(59)
12 months or longer, Fair Value	3,309	6,168
12 months or longer, Unrealized Losses	(31)	(85)
Total, Fair Value	5,853	13,438
Total, Unrealized Losses	(31)	(144)
U.S. Government agency collateralized mortgage obligations
Total temporary impaired securities
Less than 12 months, Fair Value	0	0
Less than 12 months, Unrealized Losses	0	0
12 months or longer, Fair Value	598	627
12 months or longer, Unrealized Losses	(15)	(40)
Total, Fair Value	598	627
Total, Unrealized Losses	(15)	(40)
U.S. Government agency commercial mortgage-backed securities
Total temporary impaired securities
Less than 12 months, Fair Value	5,022	3,511
Less than 12 months, Unrealized Losses	(9)	(15)
12 months or longer, Fair Value	0	0
12 months or longer, Unrealized Losses	0	0
Total, Fair Value	5,022	3,511
Total, Unrealized Losses	(9)	(15)
Nontaxable Municipal Bonds [Member]
Total temporary impaired securities
Less than 12 months, Fair Value	3,024	1,027
Less than 12 months, Unrealized Losses	(6)	(15)
12 months or longer, Fair Value	0	0
12 months or longer, Unrealized Losses	0	0
Total, Fair Value	3,024	1,027
Total, Unrealized Losses	(6)	(15)
Taxable Municipal Bonds [Member]
Total temporary impaired securities
Less than 12 months, Fair Value	301	2,634
Less than 12 months, Unrealized Losses	(1)	(30)
12 months or longer, Fair Value	0	151
12 months or longer, Unrealized Losses	0	(4)
Total, Fair Value	301	2,785
Total, Unrealized Losses	(1)	(34)
Corporate Debt Securities [Member]
Total temporary impaired securities
Less than 12 months, Fair Value	0	510
Less than 12 months, Unrealized Losses	0	(2)
12 months or longer, Fair Value	0	0
12 months or longer, Unrealized Losses	0	0
Total, Fair Value	0	510
Total, Unrealized Losses	$ 0	$ (2)

Loans (Details)

Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014
Loans
Loans	$ 524,591		$ 498,389	$ 491,379
Less: Net deferred loan fees	197		366
Less: Allowance for loan losses	5,062	$ 4,863	4,598	4,536	$ 4,483	$ 4,072
Net loans	519,332		493,425
Real Estate
Loans
Loans	469,316		440,679
Single family
Loans
Loans	153,613		153,141	151,529
Less: Allowance for loan losses	992	1,058	1,073	1,044	1,064	1,072
Multifamily
Loans
Loans	123,799		105,750	98,950
Less: Allowance for loan losses	1,203	1,180	1,013	1,047	1,025	757
Commercial real estate
Loans
Loans	174,955		162,957	158,861
Less: Allowance for loan losses	2,034	1,801	1,604	1,500	1,507	1,412
Construction and land development
Loans
Loans	16,949		18,831	23,013
Less: Allowance for loan losses	327	335	330	368	361	301
Commercial business
Loans
Loans	36,501		38,200	39,863
Less: Allowance for loan losses	432	420	498	456	415	454
Consumer
Loans
Loans	18,774		19,510	19,163
Less: Allowance for loan losses	74	$ 69	80	$ 121	$ 111	$ 76
Home equity lines of credit
Loans
Loans	14,758		14,881
Education
Loans
Loans	3,511		4,106
Other
Loans
Loans	$ 505		$ 523

Loans (Details 2)

Loans (Details 2) - USD ($)	Jun. 30, 2016	Sep. 30, 2015	Jun. 30, 2015
Contractual aging of the recorded investment in past due loans
Current	$ 523,825,000	$ 496,975,000
Total Loans	524,591,000	498,389,000	$ 491,379,000
Troubled debt restructurings - accrual	0	0
Past due loans
Contractual aging of the recorded investment in past due loans
Recorded investment in nonaccrual loans	562,000	803,000
Single family
Contractual aging of the recorded investment in past due loans
Current	152,975,000	152,245,000
Total Loans	153,613,000	153,141,000	151,529,000
Single family | Past due loans
Contractual aging of the recorded investment in past due loans
Recorded investment in nonaccrual loans	453,000	340,000
Multifamily
Contractual aging of the recorded investment in past due loans
Current	123,799,000	105,750,000
Total Loans	123,799,000	105,750,000	98,950,000
Multifamily | Past due loans
Contractual aging of the recorded investment in past due loans
Recorded investment in nonaccrual loans	0	0
Construction and land development
Contractual aging of the recorded investment in past due loans
Current	16,949,000	18,827,000
Total Loans	16,949,000	18,831,000	23,013,000
Construction and land development | Past due loans
Contractual aging of the recorded investment in past due loans
Recorded investment in nonaccrual loans	0	0
Commercial business
Contractual aging of the recorded investment in past due loans
Current	36,501,000	38,200,000
Total Loans	36,501,000	38,200,000	39,863,000
Commercial business | Past due loans
Contractual aging of the recorded investment in past due loans
Recorded investment in nonaccrual loans	0	0
Home equity lines of credit
Contractual aging of the recorded investment in past due loans
Current	14,731,000	14,691,000
Total Loans	14,758,000	14,881,000
Home equity lines of credit | Past due loans
Contractual aging of the recorded investment in past due loans
Recorded investment in nonaccrual loans	37,000	203,000
Commercial real estate
Contractual aging of the recorded investment in past due loans
Current	174,955,000	162,957,000
Total Loans	174,955,000	162,957,000	$ 158,861,000
Commercial real estate | Past due loans
Contractual aging of the recorded investment in past due loans
Recorded investment in nonaccrual loans	0	0
Education
Contractual aging of the recorded investment in past due loans
Current	3,410,000	3,782,000
Total Loans	3,511,000	4,106,000
Education | Past due loans
Contractual aging of the recorded investment in past due loans
Recorded investment in nonaccrual loans	72,000	260,000
Other
Contractual aging of the recorded investment in past due loans
Current	505,000	523,000
Total Loans	505,000	523,000
Other | Past due loans
Contractual aging of the recorded investment in past due loans
Recorded investment in nonaccrual loans	0	0
Financing Receivables, 60 to 89 Days Past Due
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	7,000	83,000
Financing Receivables, 60 to 89 Days Past Due | Single family
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	0	83,000
Financing Receivables, 60 to 89 Days Past Due | Multifamily
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due | Construction and land development
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due | Commercial business
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due | Home equity lines of credit
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due | Commercial real estate
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due | Education
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	7,000	0
Financing Receivables, 60 to 89 Days Past Due | Other
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	444,000	556,000
Financing Receivables, 30 to 59 Days Past Due | Single family
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	415,000	473,000
Financing Receivables, 30 to 59 Days Past Due | Multifamily
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due | Construction and land development
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	0	4,000
Financing Receivables, 30 to 59 Days Past Due | Commercial business
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due | Home equity lines of credit
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due | Commercial real estate
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due | Education
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	29,000	79,000
Financing Receivables, 30 to 59 Days Past Due | Other
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	315,000	775,000
Financing Receivables, Equal to Greater than 90 Days Past Due | Single family
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	223,000	340,000
Financing Receivables, Equal to Greater than 90 Days Past Due | Multifamily
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due | Construction and land development
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial business
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due | Home equity lines of credit
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	27,000	190,000
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial real estate
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due | Education
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	65,000	245,000
Financing Receivables, Equal to Greater than 90 Days Past Due | Other
Contractual aging of the recorded investment in past due loans
Financing Receivable, Recorded Investment, Past Due	$ 0	$ 0

Loans (Details 3)

Loans (Details 3) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015	Jun. 30, 2015
Risk category of loans evaluated by internal asset classification
Total	$ 524,591	$ 498,389	$ 491,379
Single family
Risk category of loans evaluated by internal asset classification
Total	153,613	153,141	151,529
Multifamily
Risk category of loans evaluated by internal asset classification
Total	123,799	105,750	98,950
Commercial real estate
Risk category of loans evaluated by internal asset classification
Total	174,955	162,957	158,861
Construction and land development
Risk category of loans evaluated by internal asset classification
Total	16,949	18,831	23,013
Commercial business
Risk category of loans evaluated by internal asset classification
Total	36,501	38,200	$ 39,863
Home equity lines of credit
Risk category of loans evaluated by internal asset classification
Total	14,758	14,881
Education
Risk category of loans evaluated by internal asset classification
Total	3,511	4,106
Other
Risk category of loans evaluated by internal asset classification
Total	505	523
Pass
Risk category of loans evaluated by internal asset classification
Total	511,436	487,299
Pass | Single family
Risk category of loans evaluated by internal asset classification
Total	150,922	150,421
Pass | Multifamily
Risk category of loans evaluated by internal asset classification
Total	122,032	103,117
Pass | Commercial real estate
Risk category of loans evaluated by internal asset classification
Total	170,811	159,104
Pass | Construction and land development
Risk category of loans evaluated by internal asset classification
Total	16,947	18,831
Pass | Commercial business
Risk category of loans evaluated by internal asset classification
Total	32,087	36,561
Pass | Home equity lines of credit
Risk category of loans evaluated by internal asset classification
Total	14,621	14,636
Pass | Education
Risk category of loans evaluated by internal asset classification
Total	3,511	4,106
Pass | Other
Risk category of loans evaluated by internal asset classification
Total	505	523
Watch
Risk category of loans evaluated by internal asset classification
Total	10,456	6,904
Watch | Single family
Risk category of loans evaluated by internal asset classification
Total	750	1,135
Watch | Multifamily
Risk category of loans evaluated by internal asset classification
Total	1,767	2,633
Watch | Commercial real estate
Risk category of loans evaluated by internal asset classification
Total	3,745	3,136
Watch | Construction and land development
Risk category of loans evaluated by internal asset classification
Total	0	0
Watch | Commercial business
Risk category of loans evaluated by internal asset classification
Total	4,194	0
Watch | Home equity lines of credit
Risk category of loans evaluated by internal asset classification
Total	0	0
Watch | Education
Risk category of loans evaluated by internal asset classification
Total	0	0
Watch | Other
Risk category of loans evaluated by internal asset classification
Total	0	0
Special Mention
Risk category of loans evaluated by internal asset classification
Total	619	410
Special Mention | Single family
Risk category of loans evaluated by internal asset classification
Total	0	0
Special Mention | Multifamily
Risk category of loans evaluated by internal asset classification
Total	0	0
Special Mention | Commercial real estate
Risk category of loans evaluated by internal asset classification
Total	399	410
Special Mention | Construction and land development
Risk category of loans evaluated by internal asset classification
Total	0	0
Special Mention | Commercial business
Risk category of loans evaluated by internal asset classification
Total	220	0
Special Mention | Home equity lines of credit
Risk category of loans evaluated by internal asset classification
Total	0	0
Special Mention | Education
Risk category of loans evaluated by internal asset classification
Total	0	0
Special Mention | Other
Risk category of loans evaluated by internal asset classification
Total	0	0
Substandard
Risk category of loans evaluated by internal asset classification
Total	2,080	3,776
Substandard | Single family
Risk category of loans evaluated by internal asset classification
Total	1,941	1,585
Substandard | Multifamily
Risk category of loans evaluated by internal asset classification
Total	0	0
Substandard | Commercial real estate
Risk category of loans evaluated by internal asset classification
Total	0	307
Substandard | Construction and land development
Risk category of loans evaluated by internal asset classification
Total	2	0
Substandard | Commercial business
Risk category of loans evaluated by internal asset classification
Total	0	1,639
Substandard | Home equity lines of credit
Risk category of loans evaluated by internal asset classification
Total	137	245
Substandard | Education
Risk category of loans evaluated by internal asset classification
Total	0	0
Substandard | Other
Risk category of loans evaluated by internal asset classification
Total	0	0
Doubtful
Risk category of loans evaluated by internal asset classification
Total	0	0
Doubtful | Single family
Risk category of loans evaluated by internal asset classification
Total	0	0
Doubtful | Multifamily
Risk category of loans evaluated by internal asset classification
Total	0	0
Doubtful | Commercial real estate
Risk category of loans evaluated by internal asset classification
Total	0	0
Doubtful | Construction and land development
Risk category of loans evaluated by internal asset classification
Total	0	0
Doubtful | Commercial business
Risk category of loans evaluated by internal asset classification
Total	0	0
Doubtful | Home equity lines of credit
Risk category of loans evaluated by internal asset classification
Total	0	0
Doubtful | Education
Risk category of loans evaluated by internal asset classification
Total	0	0
Doubtful | Other
Risk category of loans evaluated by internal asset classification
Total	$ 0	$ 0

Loans (Details 4)

Loans (Details 4) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Sep. 30, 2015	Jun. 30, 2015
Allowance for loan losses
Balance, beginning	$ 4,863	$ 4,483	$ 4,598	$ 4,072
Provision for loan losses	250	150	525	800
Loans charge-off	(59)	(105)	(99)	(391)
Recoveries	8	8	38	55
Balance, ending	5,062	4,536	5,062	4,536
Period-ended amount allocated for:
Individually evaluated for impairment					$ 54		$ 96
Collectively evaluated for impairment					5,008		4,440
Ending Balance	4,863	4,483	4,598	4,072	5,062	$ 4,598	4,536
Loans:
Individually evaluated for impairment					3,597		3,657
Collectively evaluated for impairment					520,994		487,722
Total Loans					524,591	498,389	491,379
Real Estate
Loans:
Total Loans					469,316	440,679
Single family
Allowance for loan losses
Balance, beginning	1,058	1,064	1,073	1,072
Provision for loan losses	(7)	7	(5)	196
Loans charge-off	(59)	(28)	(89)	(236)
Recoveries	0	1	13	12
Balance, ending	992	1,044	992	1,044
Period-ended amount allocated for:
Individually evaluated for impairment					1		40
Collectively evaluated for impairment					991		1,004
Ending Balance	1,058	1,064	1,073	1,072	992	1,073	1,044
Loans:
Individually evaluated for impairment					1,740		1,578
Collectively evaluated for impairment					151,873		149,951
Total Loans					153,613	153,141	151,529
Multifamily
Allowance for loan losses
Balance, beginning	1,180	1,025	1,013	757
Provision for loan losses	23	22	190	290
Loans charge-off	0	0	0	0
Recoveries	0	0	0	0
Balance, ending	1,203	1,047	1,203	1,047
Period-ended amount allocated for:
Individually evaluated for impairment					0		0
Collectively evaluated for impairment					1,203		1,047
Ending Balance	1,180	1,025	1,013	757	1,203	1,013	1,047
Loans:
Individually evaluated for impairment					1,767		1,853
Collectively evaluated for impairment					122,032		97,097
Total Loans					123,799	105,750	98,950
Commercial real estate
Allowance for loan losses
Balance, beginning	1,801	1,507	1,604	1,412
Provision for loan losses	233	45	428	184
Loans charge-off	0	(53)	0	(115)
Recoveries	0	1	2	19
Balance, ending	2,034	1,500	2,034	1,500
Period-ended amount allocated for:
Individually evaluated for impairment					0		0
Collectively evaluated for impairment					2,034		1,500
Ending Balance	1,801	1,507	1,604	1,412	2,034	1,604	1,500
Loans:
Individually evaluated for impairment					0		0
Collectively evaluated for impairment					174,955		158,861
Total Loans					174,955	162,957	158,861
Construction and land development
Allowance for loan losses
Balance, beginning	335	361	330	301
Provision for loan losses	(8)	7	(3)	67
Loans charge-off	0	0	0	0
Recoveries	0	0	0	0
Balance, ending	327	368	327	368
Period-ended amount allocated for:
Individually evaluated for impairment					0		0
Collectively evaluated for impairment					327		368
Ending Balance	335	361	330	301	327	330	368
Loans:
Individually evaluated for impairment					0		0
Collectively evaluated for impairment					16,949		23,013
Total Loans					16,949	18,831	23,013
Commercial business
Allowance for loan losses
Balance, beginning	420	415	498	454
Provision for loan losses	5	37	(82)	1
Loans charge-off	0	0	0	(14)
Recoveries	7	4	16	15
Balance, ending	432	456	432	456
Period-ended amount allocated for:
Individually evaluated for impairment					0		0
Collectively evaluated for impairment					432		456
Ending Balance	420	415	498	454	432	498	456
Loans:
Individually evaluated for impairment					0		0
Collectively evaluated for impairment					36,501		39,863
Total Loans					36,501	38,200	39,863
Consumer and other
Allowance for loan losses
Balance, beginning	69	111	80	76
Provision for loan losses	4	32	(3)	62
Loans charge-off	0	(24)	(10)	(26)
Recoveries	1	2	7	9
Balance, ending	74	121	74	121
Period-ended amount allocated for:
Individually evaluated for impairment					53		56
Collectively evaluated for impairment					21		65
Ending Balance	$ 69	$ 111	$ 80	$ 76	74	80	121
Loans:
Individually evaluated for impairment					90		226
Collectively evaluated for impairment					18,684		18,937
Total Loans					$ 18,774	$ 19,510	$ 19,163

Loans (Details 5)

Loans (Details 5) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Unpaid Principal Balance
Total	$ 3,907	$ 3,960	$ 3,907	$ 3,960
Recorded Investment
Total	3,597	3,657	3,597	3,657
Allowance for Loan Losses Allocated
With an allowance recorded	54	96	54	96
Average Recorded Investment
Total	3,609	4,291	3,595	4,353
Interest Income Recognized
Total	41	38	125	109
Single family
Unpaid Principal Balance
With no related allowance recorded	1,601	1,376	1,601	1,376
With an allowance recorded	310	315	310	315
Recorded Investment
With no related allowance recorded	1,430	1,263	1,430	1,263
With an allowance recorded	310	315	310	315
Allowance for Loan Losses Allocated
With an allowance recorded	1	40	1	40
Average Recorded Investment
With no related allowance recorded	1,428	1,315	1,308	1,298
With an allowance recorded	311	316	361	336
Interest Income Recognized
With no related allowance	18	13	55	36
With related allowance	3	4	11	11
Multifamily
Unpaid Principal Balance
With no related allowance recorded	1,824	1,941	1,824	1,941
With an allowance recorded	0	0	0	0
Recorded Investment
With no related allowance recorded	1,767	1,853	1,767	1,853
With an allowance recorded	0	0	0	0
Allowance for Loan Losses Allocated
With an allowance recorded	0	0	0	0
Average Recorded Investment
With no related allowance recorded	1,778	1,864	1,801	1,884
With an allowance recorded	0	0	0	0
Interest Income Recognized
With no related allowance	19	20	57	60
With related allowance	0	0	0	0
Commercial real estate
Unpaid Principal Balance
With no related allowance recorded	0	0	0	0
With an allowance recorded	0	0	0	0
Recorded Investment
With no related allowance recorded	0	0	0	0
With an allowance recorded	0	0	0	0
Allowance for Loan Losses Allocated
With an allowance recorded	0	0	0	0
Average Recorded Investment
With no related allowance recorded	0	543	0	527
With an allowance recorded	0	0	0	41
Interest Income Recognized
With no related allowance	0	0	0	0
With related allowance	0	0	0	0
Construction and land development
Unpaid Principal Balance
With no related allowance recorded	4	0	4	0
With an allowance recorded	0	0	0	0
Recorded Investment
With no related allowance recorded	0	0	0	0
With an allowance recorded	0	0	0	0
Allowance for Loan Losses Allocated
With an allowance recorded	0	0	0	0
Average Recorded Investment
With no related allowance recorded	0	0	0	0
With an allowance recorded	0	0	0	0
Interest Income Recognized
With no related allowance	0	0	0	0
With related allowance	0	0	0	0
Commercial business
Unpaid Principal Balance
With no related allowance recorded	0	0	0	0
With an allowance recorded	0	0	0	0
Recorded Investment
With no related allowance recorded	0	0	0	0
With an allowance recorded	0	0	0	0
Allowance for Loan Losses Allocated
With an allowance recorded	0	0	0	0
Average Recorded Investment
With no related allowance recorded	0	0	0	0
With an allowance recorded	0	0	0	0
Interest Income Recognized
With no related allowance	0	0	0	0
With related allowance	0	0	0	0
Consumer and other
Unpaid Principal Balance
With no related allowance recorded	115	272	115	272
With an allowance recorded	53	56	53	56
Recorded Investment
With no related allowance recorded	37	170	37	170
With an allowance recorded	53	56	53	56
Allowance for Loan Losses Allocated
With an allowance recorded	53	56	53	56
Average Recorded Investment
With no related allowance recorded	38	196	71	210
With an allowance recorded	54	57	54	57
Interest Income Recognized
With no related allowance	0	0	0	0
With related allowance	$ 1	$ 1	$ 2	$ 2

Loans (Details 6)

Loans (Details 6)	3 Months Ended		9 Months Ended
	Jun. 30, 2016USD ($)contract	Jun. 30, 2015USD ($)contract	Jun. 30, 2016USD ($)contract	Jun. 30, 2015USD ($)contract	Sep. 30, 2015USD ($)
Troubled debt restructured loans
Troubled debt restructurings - accrual	$ 0		$ 0		$ 0
Modified Trouble Debt Restructurings
Number of Modifications | contract	0	0	0	0
Unpaid Principal Balance (at end of period)	$ 0	$ 0	$ 0	$ 0
Loans Modified in a Trouble Debt Restructuring [Abstract]
Number of re-defaults of TDR | contract	0	0	0	0
Past due loans
Troubled debt restructured loans
Troubled debt restructurings - accrual	$ 3,050,000		$ 3,050,000		3,134,000
Troubled debt restructurings - nonaccrual	0		0		0
Troubled debt restructurings	$ 3,050,000		$ 3,050,000		$ 3,134,000

Loans Loans (Details 7)

Loans Loans (Details 7) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2016	Sep. 30, 2015
Loans and Leases Receivable, Related Parties [Roll Forward]
Loans outstanding to officers, employees, directors, and their associates	$ 3,794	$ 3,334
Loans and Leases Receivable, Related Parties, Additions	927
Loans and Leases Receivable, Related Parties, Amount Drawn Upon During Period	157
Loans and Leases Receivable, Related Parties, Collections	(993)
Loans and Leases Receivable, Related Parties, Other	$ 369

Deposits (Details)

Deposits (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Negotiable order for withdrawal accounts:
Noninterest bearing	$ 106,551	$ 101,486
Interest bearing	132,676	131,968
Gross total	239,227	233,454
Passbook and Statement Savings	133,754	127,431
Variable Rate Money Market Accounts	58,168	47,876
Certificates of Deposit	132,366	122,259
Deposits	$ 563,515	$ 531,020
Negotiable order for withdrawal accounts:
Noninterest bearing (as a percent)	18.91%	19.11%
Interest bearing (as a percent)	23.54%	24.85%
Gross total (as a percent)	42.45%	43.96%
Passbook and Statement Savings (as a percent)	23.74%	24.00%
Variable Rate Money Market Accounts (as a percent)	10.32%	9.02%
Certificates of Deposit (as a percent)	23.49%	23.02%
Deposits (as a percent)	100.00%	100.00%
Certificates of Deposit over one hundred thousand dollars	$ 75,674	$ 64,155
Certificates of Deposit over two hundred fifty thousand dollars	$ 11,826	$ 8,775

Regulatory Capital (Details)

Regulatory Capital (Details) - Westbury Bank - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Total capital (to risk-weighted assets), Amount
Actual	$ 72,360	$ 68,753
For Capital Adequacy Purposes	44,567	41,923
For Capital Adequacy Purposes with Capital Buffer	48,049
To be Well Capitalized Under Prompt Corrective Action Provisions	$ 55,709	$ 52,403
Total capital (to risk-weighted assets), Ratio
Actual (as a percent)	12.99%	13.12%
For Capital Adequacy Purposes (as a percent)	8.00%	8.00%
For Capital Adequacy with Capital Buffer (as a percent)	8.625%
To be Well Capitalized Under Prompt Corrective Action Provisions (as a percent)	10.00%	10.00%
Tier 1 capital (to risk-weighted assets), Amount
Actual	$ 67,298	$ 64,155
For Capital Adequacy Purposes	33,425	31,423
For Capital Adequacy Purposes with Capital Buffer	36,907
To be Well Capitalized Under Prompt Corrective Action Provisions	$ 44,567	$ 41,897
Tier 1 capital (to risk-weighted assets), Ratio
Actual (as a percent)	12.08%	12.25%
For Capital Adequacy Purposes (as a percent)	6.00%	6.00%
For Capital Adequacy with Capital Buffer (as a percent)	6.625%
To be Well Capitalized Under Prompt Corrective Action Provisions (as a percent)	8.00%	8.00%
CETI capital (to risk-weighted assets), Amount
Actual	$ 67,298	$ 64,155
For Capital Adequacy Purposes	25,069	23,567
For Capital Adequacy Purposes with Capital Buffer	28,551
To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 36,211	$ 34,041
CETI capital (to risk-weighted assets), Ratio
Actual (as a percent)	12.08%	12.25%
For Capital Adequacy Purposes (as a percent)	4.50%	4.50%
For Capital Adequacy with Capital Buffer (as a pecent)	5.125%
To Be Well Capitalized Under Prompt Corrective Action Provisions (as a percent)	6.50%	6.50%
Tier 1 capital (to adjusted total assets), Amount
Actual	$ 67,298	$ 64,155
For Capital Adequacy Purposes	27,274	25,636
To be Well Capitalized Under Prompt Corrective Action Provisions	$ 34,092	$ 32,045
Tier 1 capital (to adjusted total assets), Ratio
Actual (as a percent)	9.87%	10.01%
For Capital Adequacy Purposes (as a percent)	4.00%	4.00%
To be Well Capitalized Under Prompt Corrective Action Provisions (as a percent)	5.00%	5.00%

Regulatory Capital- Stockholder

Regulatory Capital- Stockholders' equity of the Bank (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2016	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2014
Regulatory Capital
Stockholders' equity	$ 79,082	$ 78,812	$ 77,001	$ 86,487
Westbury Bank
Regulatory Capital
Stockholders' equity	72,808	70,976
Unrealized (gain) loss on securities	(965)	(352)
Investment in subsidiary	3,296	3,296
Disallowed deferred tax assets	(1,249)	(3,173)
Tier 1 and tangible capital	67,298	64,155
Plus: Allowable general valuation allowances	5,062	4,598
Actual	$ 72,360	$ 68,753

Commitments (Details)

Commitments (Details) - USD ($)	9 Months Ended
	Jun. 30, 2016	Sep. 30, 2015
Financial Instruments with Off-Balance Sheet Risk
Liabilities recorded for company's potential obligations	$ 0	$ 0
Fixed rate commitments to extend mortgage credit
Financial Instruments with Off-Balance Sheet Risk
Financial instruments whose contract amounts represent credit risk	11,305,000	8,443,000
Adjustable rate commitments to extend mortgage credit
Financial Instruments with Off-Balance Sheet Risk
Financial instruments whose contract amounts represent credit risk	314,000	9,929,000
Standby letters of credit
Financial Instruments with Off-Balance Sheet Risk
Financial instruments whose contract amounts represent credit risk	$ 574,000	884,000
Maximum period of letters of credit primarily issued to support public and private borrowing arrangements	1 year
Commitment to sell loans
Financial Instruments with Off-Balance Sheet Risk
Financial instruments whose contract amounts represent credit risk	$ 2,187,000	431,000
Commercial Loan [Member] | Unused commercial loan lines of credit
Financial Instruments with Off-Balance Sheet Risk
Financial instruments whose contract amounts represent credit risk	90,752,000	54,225,000
Home Equity Loan [Member] | Unused commercial loan lines of credit
Financial Instruments with Off-Balance Sheet Risk
Financial instruments whose contract amounts represent credit risk	$ 27,034,000	$ 26,164,000

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2016	Sep. 30, 2015
Assets
Securities available-for-sale	$ 87,254	$ 80,286
U.S. Government and agency securities
Assets
Securities available-for-sale	25	25
U.S. Government agency residential mortgage-backed securities
Assets
Securities available-for-sale	36,497	39,692
U.S. Government agency collateralized mortgage obligations
Assets
Securities available-for-sale	2,803	1,941
U.S. Government agency commercial mortgage-backed securities
Assets
Securities available-for-sale	12,382	14,099
Nontaxable Municipal Bonds [Member]
Assets
Securities available-for-sale	16,197	2,201
Taxable Municipal Bonds [Member]
Assets
Securities available-for-sale	15,344	19,466
Corporate Debt Securities [Member]
Assets
Securities available-for-sale	4,006	2,862
Quoted Prices in Active Markets for Identical Assets (Level 1)
Liabilities
Derivatives	$ 0	0
Significant Other Observable Inputs (Level 2)
Assets and liabilities measured at fair value
Period of U.S. Treasury rate	10 years
Assets
Securities available-for-sale	$ 87,254	80,286
Derivatives	97	110
Liabilities
Derivatives	97	110
Significant Other Unobservable Inputs (Level 3)
Liabilities
Derivatives	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available-for-sale	0	0
Derivatives	0	0
Liabilities
Derivatives	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Government and agency securities
Assets
Securities available-for-sale	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Government agency residential mortgage-backed securities
Assets
Securities available-for-sale	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Government agency collateralized mortgage obligations
Assets
Securities available-for-sale	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Nontaxable Municipal Bonds [Member]
Assets
Securities available-for-sale	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate Debt Securities [Member]
Assets
Securities available-for-sale	0	0
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets
Securities available-for-sale	87,254	80,286
Derivatives	97	110
Liabilities
Derivatives	97	110
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Government and agency securities
Assets
Securities available-for-sale	25	25
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Government agency residential mortgage-backed securities
Assets
Securities available-for-sale	36,497	39,692
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Government agency collateralized mortgage obligations
Assets
Securities available-for-sale	2,803	1,941
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Government agency commercial mortgage-backed securities
Assets
Securities available-for-sale	12,382	14,099
Recurring basis | Significant Other Observable Inputs (Level 2) | Nontaxable Municipal Bonds [Member]
Assets
Securities available-for-sale	16,197	2,201
Recurring basis | Significant Other Observable Inputs (Level 2) | Taxable Municipal Bonds [Member]
Assets
Securities available-for-sale	15,344	19,466
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate Debt Securities [Member]
Assets
Securities available-for-sale	4,006	2,862
Recurring basis | Significant Other Unobservable Inputs (Level 3)
Assets
Securities available-for-sale	0	0
Derivatives	0	0
Liabilities
Derivatives	0	0
Recurring basis | Significant Other Unobservable Inputs (Level 3) | U.S. Government and agency securities
Assets
Securities available-for-sale	0	0
Recurring basis | Significant Other Unobservable Inputs (Level 3) | U.S. Government agency residential mortgage-backed securities
Assets
Securities available-for-sale	0	0
Recurring basis | Significant Other Unobservable Inputs (Level 3) | U.S. Government agency collateralized mortgage obligations
Assets
Securities available-for-sale	0	0
Recurring basis | Significant Other Unobservable Inputs (Level 3) | Nontaxable Municipal Bonds [Member]
Assets
Securities available-for-sale	0	0
Recurring basis | Significant Other Unobservable Inputs (Level 3) | Corporate Debt Securities [Member]
Assets
Securities available-for-sale	0	0
Total
Assets
Securities available-for-sale	87,254	80,286
Derivatives	97	110
Liabilities
Derivatives	97	110
Total | Recurring basis
Assets
Securities available-for-sale	87,254	80,286
Derivatives	97	110
Liabilities
Derivatives	97	110
Total | Recurring basis | U.S. Government and agency securities
Assets
Securities available-for-sale	25	25
Total | Recurring basis | U.S. Government agency residential mortgage-backed securities
Assets
Securities available-for-sale	36,497	39,692
Total | Recurring basis | U.S. Government agency collateralized mortgage obligations
Assets
Securities available-for-sale	2,803	1,941
Total | Recurring basis | U.S. Government agency commercial mortgage-backed securities
Assets
Securities available-for-sale	12,382	14,099
Total | Recurring basis | Nontaxable Municipal Bonds [Member]
Assets
Securities available-for-sale	16,197	2,201
Total | Recurring basis | Taxable Municipal Bonds [Member]
Assets
Securities available-for-sale	15,344	19,466
Total | Recurring basis | Corporate Debt Securities [Member]
Assets
Securities available-for-sale	$ 4,006	$ 2,862

Fair Value Measurements (Deta47

Fair Value Measurements (Details 2) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015	Jun. 30, 2015
Assets measured at fair value on a nonrecurring basis
Impaired loans, valuation allowance	$ 54		$ 96
Foreclosed real estate	0	$ 283
Real estate held for sale	717	882
Significant Other Unobservable Inputs (Level 3)
Assets measured at fair value on a nonrecurring basis
Mortgage servicing rights	883	1,210
Carrying Amount
Assets measured at fair value on a nonrecurring basis
Mortgage servicing rights	883	1,210
Total
Assets measured at fair value on a nonrecurring basis
Mortgage servicing rights	883	1,210
Nonrecurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets measured at fair value on a nonrecurring basis
Impaired loans	0	0
Foreclosed real estate	0	0
Mortgage servicing rights	0	0
Real estate held for sale	0	0
Nonrecurring Basis | Significant Other Observable Inputs (Level 2)
Assets measured at fair value on a nonrecurring basis
Impaired loans	0	0
Foreclosed real estate	0	0
Mortgage servicing rights	0	0
Real estate held for sale	0	0
Nonrecurring Basis | Significant Other Unobservable Inputs (Level 3)
Assets measured at fair value on a nonrecurring basis
Impaired loans, valuation allowance	54	77
Mortgage servicing rights, valuation allowance	212	105
Impaired loans	309	390
Foreclosed real estate	0	283
Mortgage servicing rights	883	1,210
Real estate held for sale	717	882
Nonrecurring Basis | Carrying Amount | Significant Other Unobservable Inputs (Level 3)
Assets measured at fair value on a nonrecurring basis
Impaired loans	363	467
Mortgage servicing rights	1,095	1,315
Nonrecurring Basis | Total
Assets measured at fair value on a nonrecurring basis
Impaired loans	309	390
Foreclosed real estate	0	283
Mortgage servicing rights	883	1,210
Real estate held for sale	$ 717	$ 882

Fair Value Measurements (Deta48

Fair Value Measurements (Details 3) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Financial assets:
Securities available-for-sale	$ 87,254	$ 80,286
Securities held to maturity	2,293	2,459
Federal Home Loan Bank stock	1,301	3,350
Financial liabilities:
Short-term advances from Federal Home Loan Bank	0	18,000
Advances from Federal Home Loan Bank	20,000	0
Advance payments by borrowers for property taxes and insurance	3,637	5,382
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	17,817	16,488
Securities held to maturity	0	0
Accrued interest receivable	2,091	1,965
Financial liabilities:
Deposits	106,551	101,486
Short-term advances from Federal Home Loan Bank	0	0
Advances from Federal Home Loan Bank	0	0
Advance payments by borrowers for property taxes and insurance	3,637	5,382
Accrued interest payable	5	5
Derivative liability	0	0
Significant Other Observable Inputs (Level 2)
Financial assets:
Securities available-for-sale	87,254	80,286
Securities held to maturity	2,393	2,490
Loans held for sale, net	2,187	431
Derivative asset	97	110
Financial liabilities:
Deposits	0	0
Short-term advances from Federal Home Loan Bank	0	18,000
Advances from Federal Home Loan Bank	0	0
Advance payments by borrowers for property taxes and insurance	0	0
Accrued interest payable	0	0
Derivative liability	97	110
Significant Other Unobservable Inputs (Level 3)
Financial assets:
Securities held to maturity	0	0
Loans, net	521,999	493,480
Federal Home Loan Bank stock	1,301	3,350
Mortgage servicing rights	883	1,210
Financial liabilities:
Deposits	432,027	406,853
Short-term advances from Federal Home Loan Bank	0	0
Advances from Federal Home Loan Bank	19,647	0
Advance payments by borrowers for property taxes and insurance	0	0
Accrued interest payable	0	0
Derivative liability	0	0
Carrying Amount
Financial assets:
Cash and cash equivalents	17,817	16,488
Securities available-for-sale	87,254	80,286
Securities held to maturity	2,293	2,459
Loans, net	519,332	493,425
Loans held for sale, net	2,187	431
Federal Home Loan Bank stock	1,301	3,350
Mortgage servicing rights	883	1,210
Accrued interest receivable	2,091	1,965
Derivative asset	97	110
Financial liabilities:
Deposits	563,515	531,020
Short-term advances from Federal Home Loan Bank	0	18,000
Advances from Federal Home Loan Bank	20,000	0
Advance payments by borrowers for property taxes and insurance	3,637	5,382
Accrued interest payable	5	5
Derivative liability	97	110
Estimated Fair Value
Financial assets:
Cash and cash equivalents	17,817	16,488
Securities available-for-sale	87,254	80,286
Securities held to maturity	2,393	2,490
Loans, net	521,999	493,480
Loans held for sale, net	2,187	431
Federal Home Loan Bank stock	1,301	3,350
Mortgage servicing rights	883	1,210
Accrued interest receivable	2,091	1,965
Derivative asset	97	110
Financial liabilities:
Deposits	538,578	508,339
Short-term advances from Federal Home Loan Bank	0	18,000
Advances from Federal Home Loan Bank	19,647	0
Advance payments by borrowers for property taxes and insurance	3,637	5,382
Accrued interest payable	5	5
Derivative liability	$ 97	$ 110

Employee Stock Ownership Plan (

Employee Stock Ownership Plan (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Sep. 30, 2015	Apr. 11, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Employee Stock Ownership Plan (ESOP), Debt Structure, Indirect Loan, Amount						$ 4,100
employee stock ownership plan, price per share						$ 10
ESOP committed-to-be-released shares, during period	10,285	5,143	25,712	15,427
ESOP compensation expense	$ 202	$ 90	$ 485	$ 288
Allocated shares to active participants	52,861		52,861		34,132
Shares committed to be released	20,570		20,570		15,428
Unallocated shares	329,123		329,123		354,835
Total ESOP shares	402,554		402,554		404,395	411,403
Fair value of unallocated shares	$ 6,418		$ 6,418		$ 6,323

Compensation Equity Plans Cost

Compensation Equity Plans Cost of Share-based Payment Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Total cost of stock grant plan during the period	$ 152	$ 154	$ 454	$ 464
Total cost of stock option plan during the period	59	46	174	138
Total cost of share-based payment plans during the period	211	200	628	602
Amount of related income tax benefit recognized in income	$ 83	$ 78	$ 246	$ 236

Compensation Equity Plans Stock

Compensation Equity Plans Stock Option Activity (Details) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2016USD ($)$ / sharesshares	Jun. 30, 2016USD ($)$ / sharesshares
Number of Options
Options outstanding, beginning balance (shares) | shares	404,111	406,409
Granted (shares) | shares	87,939	89,939
Exercised (shares) | shares	159	4,457
Expired or canceled (shares) | shares	0	0
Forfeited (shares) | shares	2,681	2,681
Options outstanding, ending balance (shares) | shares	489,210	489,210
Options exercisable as of June 30, 2015 (shares) | shares	139,355	139,355
Weighted Average Exercise Price
Options outstanding, beginning balance (in dollars per share) | $ / shares	$ 15.69	$ 15.68
Granted (in dollars per share) | $ / shares	19.86	19.86
Exercised (in dollars per share) | $ / shares	15.20	15.20
Expired or canceled (in dollars per share) | $ / shares	0	0
Forfeited (in dollars per share) | $ / shares	16.23	16.23
Options outstanding, ending balance (in dollars per share) | $ / shares	16.44	16.44
Options exercisable as of March 31, 2015 (in dollars per share) | $ / shares	$ 15.45	$ 15.45
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding, Weighted Average Remaining Contractual Term	8 years 6 months 20 days	8 years 6 months 20 days
Outstanding, Aggregate Intrinsic Value | $	$ 1,673	$ 1,673
Options Exercisable, Weighted Average Remaining Contractual Term	8 years 1 month 10 days	8 years 1 month 10 days
Options Exercisable, Aggregate Intrinsic Value | $	$ 615	$ 615

Compensation Equity Plans Assum

Compensation Equity Plans Assumptions (Details) - $ / shares	9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Risk-free interest rate	1.28%	2.10%
Expected volatility of Company's stock	11.08%	7.44%
Expected dividend yield	0.00%	0.00%
Expected life of options (years)	7 years 6 months	7 years 6 months
Weighted average fair value per option of options granted during the period	$ 3.30	$ 2.95

Compensation Equity Plans Restr

Compensation Equity Plans Restricted Shares (Details) - $ / shares	3 Months Ended	9 Months Ended
	Jun. 30, 2016	Jun. 30, 2016
Number of Shares
Shares Outstanding at September 30, 2014		158,052
Granted		2,000
Vested		39,503
Forfeited		0
Shares Outstanding at June 30, 2015	120,549	120,549
Weighted Average Grant Date Fair Value
Shares Outstanding at September 30, 2014 (in dollars per share)		$ 15.20
Granted (in dollars per share)		18
Vested (in dollars per share)		15.20
Forfeited (in dollars per share)		0
Shares Outstanding at March 31, 2015 (in dollars per share)	$ 15.25	$ 15.25
Restricted Shares and Units
Number of Shares
Shares Outstanding at September 30, 2014	160,052
Granted	0
Vested	39,503
Forfeited	0
Shares Outstanding at June 30, 2015	120,549	120,549
Weighted Average Grant Date Fair Value
Shares Outstanding at September 30, 2014 (in dollars per share)	$ 15.23
Granted (in dollars per share)	0
Vested (in dollars per share)	15.20
Forfeited (in dollars per share)	0
Shares Outstanding at March 31, 2015 (in dollars per share)	$ 15.25	$ 15.25

Compensation Equity Plans Narra

Compensation Equity Plans Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, minimum			5 years
Vesting period, maximum			10 years
Restricted share vesting period			5 years
Intrinsic value of options exercised during the period	$ 1,000	$ 0	$ 11,000	$ 0
Intrinsic value of restricted shares vested during the period		$ 0	0	0
Compensation cost not yet recognized	$ 3,000,000		$ 3,000,000
Period for recognition			3 years 3 months 7 days
Restricted Shares and Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of restricted shares vested during the period			$ 785,000	$ 703,000
Westbury Bancorp Inc 2014 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized					509,162
Westbury Bancorp Inc 2014 Equity Incentive Plan | Restricted Shares and Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized					203,665
Number of shares available for grant-stock grants	3,092		3,092
Westbury Bancorp Inc 2014 Equity Incentive Plan | Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant-stock options	15,495		15,495

Condensed Parent Company Fina55

Condensed Parent Company Financial Information Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2014
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and interest bearing deposits	$ 17,817	$ 16,488	$ 15,964	$ 17,608
Other assets	4,042	3,488
Total assets	670,778	638,929
Other liabilities	4,544	5,715
Stockholders' equity	79,082	78,812	$ 77,001	$ 86,487
Liabilities and Equity	670,778	638,929
Parent Company
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and interest bearing deposits	34	1,440
Investments	64	115
Loan to ESOP	3,620	3,778
Investment in subsidiary	75,548	74,201
Other assets	2,595	2,660
Total assets	81,861	82,194
Other liabilities	40	157
Stockholders' equity	81,821	82,037
Liabilities and Equity	$ 81,861	$ 82,194

Condensed Parent Company Fina56

Condensed Parent Company Financial Information Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Condensed Income Statements, Captions [Line Items]
Net income	$ 906	$ 110	$ 2,818	$ 1,041
Parent Company
Condensed Income Statements, Captions [Line Items]
Interest and other income	34	35	99	161
Interest and other expense	120	199	371	548
Loss before income tax benefit and equity in undistributed net income of subsidiary	(86)	(164)	(272)	(387)
Income tax benefit	(17)	(46)	(56)	(100)
Loss before equity in undistributed net income of subsidiary	(69)	(118)	(216)	(287)
Equity in undistributed net income of subsidiary	975	228	3,034	1,328
Net income	$ 906	$ 110	$ 2,818	$ 1,041

Condensed Parent Company Fina57

Condensed Parent Company Financial Information Statement of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income	$ 906	$ 110	$ 2,818	$ 1,041
Net change in other assets			(553)	(459)
Net cash provided by (used in) operating activities			1,730	791
Net Cash Provided by (Used in) Investing Activities [Abstract]
Purchase of securities			(39,340)	(21,395)
Net cash provided by investing activities			(30,622)	(63,159)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Stock options exercised			68	0
Repurchase of common stock			(4,342)	(11,379)
Net cash used in financing activities			30,221	60,724
Parent Company
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income	906	110	2,818	1,041
Equity in undistributed net income of subsidiary	(975)	(228)	(3,034)	(1,328)
Net change in other liabilities			(117)	229
Net change in other assets			692	(48)
Net cash provided by (used in) operating activities			359	(106)
Net Cash Provided by (Used in) Investing Activities [Abstract]
Purchase of securities			0	(728)
Sales and maturities of securities			51	6,879
Payments received on ESOP loan			158	153
Dividend received from bank subsidiary			(2,300)	0
Net cash provided by investing activities			2,509	6,304
Net Cash Provided by (Used in) Financing Activities [Abstract]
Stock options exercised			68	0
Repurchase of common stock			(4,342)	(11,379)
Net cash used in financing activities			(4,274)	(11,379)
Net decrease in cash			(1,406)	(5,181)
Beginning of period			1,440	6,878
End of period	$ 34	$ 1,697	$ 34	$ 1,697