10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark one)

ý QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2018

or

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission File Number 001-38456

Columbia Financial, Inc.

(Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation or organization)	22-3504946 (I.R.S. Employer Identification Number)
19-01 Route 208 North, Fair Lawn, New Jersey (Address of principal executive offices)	07410 (Zip Code)

(800) 522-4167

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports) and (2) has been subject to such filing requirements for the past 90 days.

¨ Yes ý No

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

ý Yes ¨ No

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer”, “smaller reporting company”, and “emerging growth company” in Rule 12b-2 of the Exchange Act:

Large accelerated filer	¨	Accelerated filer	¨	Smaller reporting company	¨
Non-accelerated filer	ý	Emerging growth company	ý

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

¨ Yes ý No

Ten shares of the Registrant's common stock, par value of $0.01 per share, were issued and outstanding as of March 31, 2018.

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Index to Form 10-Q

Item Number		Page Number
PART I.	Financial Information
Item 1.	Financial Statements
	Consolidated Balance Sheets as of March 31, 2018 (unaudited) and September 30, 2017 (audited)	2
	Consolidated Statements of Income for the three and six months ended March 31, 2018 and 2017 (unaudited)	3
	Consolidated Statements of Comprehensive Income (Loss) for the three and six months ended March 31, 2018 and 2017 (unaudited)	4
	Consolidated Statements of Changes in Stockholder's Equity for the six months ended March 31, 2018 and 2017 (unaudited)	5
	Consolidated Statements of Cash Flows for the six months ended March 31, 2018 and 2017 (unaudited)	6
	Notes to Unaudited Consolidated Financial Statements	8
Item 2.	Management’s Discussion and Analysis	38
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	43
Item 4.	Controls and Procedures	46
PART II.	Other Information
	Item 1. Legal Proceedings	47
	Item 1A. Risk Factors	47
	Item 2. Unregistered Sales of Equity Securities	47
	Item 3. Defaults Upon Senior Securities	47
	Item 4. Mine Safety Disclosures	47
	Item 5. Other Information	47
	Item 6. Exhibit	47
	Exhibit Index	48
	SIGNATURES	49

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Consolidated Balance Sheets

	(Unaudited)			(Audited)
	March 31,			September 30,
	2018			2017
	(In thousands)
Assets
Cash and cash equivalents	$	634,321		$	100,914
Short-term investments	60			61
Total cash and cash equivalents	634,381			100,975
Securities available-for-sale, at fair value	852,213			557,176
Securities held-to-maturity, at amortized cost (fair value of $245,477 and $131,822 at March 31, 2018 and September 30, 2017, respectively)	254,131			132,939
Federal Home Loan Bank stock	29,381			35,844
Loans receivable, net	4,479,919			4,307,623
Accrued interest receivable	16,614			14,687
Real estate owned	959			393
Office properties and equipment, net	43,706			40,835
Bank-owned life insurance	151,585			149,432
Goodwill and intangible assets	5,976			6,019
Other assets	96,016			83,405
Total assets	$	6,564,881		$	5,429,328
Liabilities and Stockholder's Equity
Liabilities:
Deposits	5,395,253			$	4,123,428
Borrowings	589,430			733,043
Advance payments by borrowers for taxes and insurance	28,522			27,118
Accrued expenses and other liabilities	77,772			69,825
Total liabilities	6,090,977			4,953,414
Stockholder's equity:
Retained earnings	549,264			522,094
Accumulated other comprehensive loss, net of tax	(75,360		)	(46,180		)
Total stockholder's equity	473,904			475,914
Total liabilities and stockholder's equity	$	6,564,881		$	5,429,328
See accompanying notes to unaudited consolidated financial statements.

2

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Consolidated Statements of Income (Unaudited)

	Three Months Ended March 31,				Six Months Ended March 31,
	2018		2017		2018		2017
	(In thousands)				(In thousands)
Interest and dividend income:
Loans receivable	$	43,841	$	40,602	$	86,884	$	79,976
Securities available-for-sale	6,415		4,338		11,488		8,646
Securities held-to-maturity	464		—		845		—
Federal funds and interest earning deposits	488		23		591		57
Federal Home Loan Bank stock dividends	586		466		1,154		878
Total interest and dividend income	51,794		45,429		100,962		89,557
Interest expense:
Deposits	8,099		6,072		15,731		12,288
Borrowings	4,633		4,579		9,242		9,086
Total interest expense	12,732		10,651		24,973		21,374
Net interest income	39,062		34,778		75,989		68,183
Provision for loan losses	2,000		375		5,400		375
Net interest income after provision for loan losses	37,062		34,403		70,589		67,808
Non-interest income:
Demand deposit account fees	944		914		1,904		1,765
Bank-owned life insurance	1,064		1,698		2,153		2,785
Title insurance fees	774		967		1,792		2,304
Loan fees and service charges	453		495		995		947
Gain on securities transactions, net	116		—		55		411
Gain on sale of loans receivable, net	—		102		—		510
Gain on sale of real estate owned	—		209		—		197
Other non-interest income	1,134		1,373		2,261		2,333
Total non-interest income	4,485		5,758		9,160		11,252
Non-interest expense:
Compensation and employee benefits expense	16,525		15,980		32,146		30,989
Occupancy expense	3,716		3,431		7,102		6,653
Federal insurance premiums expense	428		413		843		825
Advertising expense	847		681		2,255		1,392
Professional fees expense	214		180		611		399
Data processing expense	642		568		1,237		1,098
Other non-interest expense	3,586		3,602		7,306		7,538
Total non-interest expense	25,958		24,855		51,500		48,894
Income before income tax expense	15,589		15,306		28,249		30,166
Income tax expense	3,805		5,012		12,787		9,880
Net income	$	11,784	$	10,294	$	15,462	$	20,286
See accompanying notes to unaudited consolidated financial statements.

3

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Consolidated Statements of Comprehensive Income (Loss) (Unaudited)

	Three Months Ended March 31,						Six Months Ended March 31,
	2018			2017			2018			2017
	(In thousands)						(In thousands)
Net income	$	11,784		$	10,294		$	15,462		$	20,286
Other comprehensive (loss) income, net of tax:
Unrealized loss on securities available-for-sale	(9,985		)	394			(13,130		)	(14,815		)
Accretion of unrealized gain on securities reclassified as held-to-maturity	19			—			17			—
Reclassification adjustment for gains included in net income	88			—			28			267
	(9,878		)	394			(13,085		)	(14,548		)
Derivatives, net of tax
Unrealized gain on swap contracts	342			6			505			5
	342			6			505			5
Employee benefit plans, net of tax:
Amortization of prior service cost included in net income	(43		)	(18		)	(85		)	(37		)
Reclassification adjustment of actuarial net loss included in net income	(102		)	5			(205		)	11
Change in funded status of retirement obligations	(268		)	(135		)	(5,876		)	17
Tax effects resulting from the adoption of ASU No. 2018-02	—			—			(10,434		)	—
	(413		)	(148		)	(16,600		)	(9		)
Total other comprehensive (loss) income	(9,949		)	252			(29,180		)	(14,552		)
Total comprehensive income (loss), net of tax	$	1,835		$	10,546		$	(13,718	)	$	5,734
See accompanying notes to unaudited consolidated financial statements.

4

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Consolidated Statements of Changes in Stockholder's Equity (Unaudited)

	Retained Earnings		Accumulated other comprehensive loss, net of tax			Total stockholder's equity
	(In thousands)
Balance at September 30, 2016	$	491,022	$	(51,358	)	$	439,664
Net income	20,286		—			20,286
Other comprehensive loss	—		(14,552		)	(14,552		)
Balance at March 31, 2017	$	511,308	$	(65,910	)	$	445,398
Balance at September 30, 2017	$	522,094	$	(46,180	)	$	475,914
Net income	15,462		—			15,462
Other comprehensive loss	—		(17,472		)	(17,472		)
Reclassification of tax effects resulting from the adoption of ASU No. 2018-02	11,708		(11,708		)	—
Balance at March 31, 2018	$	549,264	$	(75,360	)	$	473,904
See accompanying notes to unaudited consolidated financial statements.

5

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Consolidated Statements of Cash Flows (Unaudited)

	Six Months Ended March 31,
	2018			2017
	(In thousands)
Cash flows from operating activities:
Net income	$	15,462		$	20,286
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of deferred loan origination fees and costs	831			408
Net amortization of premiums and discounts on securities	608			283
Amortization on mortgage servicing rights	43			57
Amortization of debt issuance costs	27			27
Depreciation and amortization of office properties and equipment	1,764			1,684
Provision for loan losses	5,400			375
Gain on securities transactions, net	(55		)	(411		)
Gain on real estate owned, net	—			(197		)
Deferred tax (benefit) expense	(2,679		)	7,994
Increase in accrued interest receivable	(1,927		)	(863		)
Increase in cash surrender value of bank-owned life insurance	(2,153		)	(2,132		)
Increase in other assets	(12,611		)	(12,935		)
Increase (decrease) in accrued expenses and other liabilities	7,947			(438		)
Net cash provided by operating activities	12,657			14,138
Cash flows from investing activities:
Proceeds from sales of securities available-for-sale	9,752			57,350
Proceeds from principal pay downs / maturities on securities available-for-sale	18,414			33,494
Proceeds from principal pay downs / maturities on securities held-to-maturity	3,795			—
Purchases of securities available-for-sale	(338,390		)	(14,005		)
Purchases of securities held-to-maturity	(125,146		)	—
Purchases of loan receivables	(60,810		)	(16,772		)
Loan originations, net of principal payments	(118,283		)	(257,039		)
Proceeds from bank-owned life insurance	—			977
Proceeds from sales of Federal Home Loan Bank stock	34,241			21,240
Purchases of Federal Home Loan Bank stock	(27,778		)	(24,111		)
Additions to office properties and equipment	(4,635		)	(2,649		)
Proceeds from sales of real estate owned	—			1,409
Net cash used in investing activities	(608,840		)	(200,106		)
Cash flows from financing activities:
Net increase in deposits	1,271,825			135,544
Proceeds from long-term borrowings	26,360			342,700
Payments for maturities, calls, and payoffs on borrowings	(1,551,600		)	(298,900		)
Increase in short-term borrowings	1,381,600			10,000
Increase (decrease) in advance payments by borrowers for taxes and insurance	1,404			(3,108		)
Net cash provided by financing activities	1,129,589			186,236
Net increase in cash and cash equivalents	533,406			268
Cash and cash equivalents at beginning of year	100,975			45,695
Cash and cash equivalents at end of year	$	634,381		$	45,963

6

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Consolidated Statements of Cash Flows (Unaudited)

	Six Months Ended March 31,
	2018		2017
	(In thousands)
Cash paid during the period for:
Interest	$	26,141	$	21,530
Income tax payments, net	7,278		9,791
Noncash investing and financing activities:
Transfer of loans receivable to real estate owned	$	566	$	145
See accompanying notes to unaudited consolidated financial statements.

7

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

1.Basis of Financial Statement Presentation

The accompanying unaudited consolidated financial statements include the accounts of Columbia Financial, Inc., its wholly-owned subsidiary Columbia Bank (the "Bank") and the Bank's wholly-owned subsidiaries (collectively, the “Company”). In consolidation, all significant inter-company accounts and transactions are eliminated.

Columbia Financial, Inc. is a majority-owned subsidiary of Columbia Bank, MHC ("MHC"). The accounts of MHC are not consolidated in the accompanying consolidated financial statements of the Company.

The Company owns 100% of the common stock of a Delaware statutory basis trust, Columbia Capital Trust I (the "Trust"). The trust is classified as a variable interest entity and is not consolidated as it does not satisfy the conditions for consolidation.

In preparing the interim unaudited consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the consolidated balance sheets and consolidated statements of income for the periods presented. Material estimates that are particularly susceptible to change are: the allowance for loan losses, the valuation of securities, the valuation of post-retirement benefits and the valuation of deferred tax assets. Estimates and assumptions are reviewed periodically and the effects of revisions are reflected in the consolidated financial statements in the period they are deemed necessary. While management uses its best judgment, actual amounts or results could differ significantly from those estimates.

The interim unaudited consolidated financial statements of the Company presented herein have been prepared in accordance with the rules of the Securities and Exchange Commission (“SEC”) for quarterly reports on Form 10-Q and U.S. generally accepted accounting principles in the United States of America (“GAAP”). Certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to the rules and regulations of the SEC.

In the opinion of management, all adjustments and disclosures considered necessary for the fair presentation of the accompanying unaudited consolidated financial statements have been included. Interim results are not necessarily reflective of the results of the entire year. The accompanying unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements for the year ended September 30, 2017 and notes thereto, which are included in the Company’s Registration Statement on Form S-1.

2.Plan of Stock Issuance

    On September 27, 2017, the Board of Directors of the Company adopted a plan of stock issuance (the “Plan”), as amended on January 25, 2018 pursuant to which the Company will sell shares of common stock, representing a minority ownership (approximately 43.0% of outstanding shares of common stock) interest in the Company. Shares will be offered to eligible depositors and borrowers and the tax qualified employee benefit plans of the Company in a subscription offering and, if necessary, to the general public in a community and/or syndicated community offering or firm commitment public offering. Columbia Bank, MHC, Columbia Financial Inc.'s holding company, will own 54.0% of the outstanding common stock following the offering. In connection with the Plan, subject to the approval of the MHC's members, the Company plans to contribute 3.0% of its then outstanding shares of common stock following the offering to the Columbia Bank Foundation.

Subsequent to the completion of the offering, the Board of Directors of the Company will have the authority to declare dividends on shares of common stock, subject to statutory and regulatory requirements and other considerations.

The direct costs of the Company’s stock offering will be deferred and deducted from the proceeds of the offering. At March 31, 2018, total deferred costs were $1.7 million. On April 19, 2018, the Company announced the completion of the offering. In connection with the closing, the Company issued 62,580,155 shares of its common stock to the MHC, the Company's mutual holding company, 3,476,675 shares to the Columbia Bank Foundation, the Bank's charitable foundation, and 49,832,345 shares to depositors of the Bank who subscribed for and were allocated shares in the minority stock offering, as well as the Columbia Bank Employee Stock Ownership Plan. On April 20, 2018, the Company's common stock began trading on the Nasdaq Global Select Market under the ticker symbol "CLBK".

8

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

3.    Recent Accounting Pronouncements

In February 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update ("ASU") No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220). The updated guidance allows a reclassification from accumulated other comprehensive income to retained earnings for the stranded tax effects resulting from the Tax Cuts and Jobs Act disclosed in Note 9. The purpose of the guidance is to improve the usefulness of the information reported to the financial statement users. The guidance is effective for all entities for fiscal years beginning after December 31, 2018 and interim periods within those fiscal years. Early adoption is permitted. The Company early adopted ASU No. 2018-02 for the period ended December 31, 2017 and the impact of the adoption resulted in a reclassification adjustment between accumulated other comprehensive income and retained earnings of $11.7 million.

As an “emerging growth company” as defined in Title 1 of the Jumpstart Our Business Startups (JOBS) Act, the Company has elected to use the extended transition period to delay the adoption of new or reissued accounting pronouncements applicable to public companies until such pronouncements are made applicable to private companies. As of March 31, 2018, there are no significant differences in the guidance comparability of the financial statements as a result of this extended transition period.

In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities (ASU 2017-12). The purpose of this updated guidance is to better align a company’s financial reporting for hedging activities with the economic objectives of those activities. The effective date for this guidance is fiscal years beginning after December 15, 2018, with early adoption, including adoption in an interim period, permitted. ASU 2017-12 requires a modified retrospective transition method in which the Company will recognize the cumulative effect of the change on the opening balance of each affected component of equity in the statement of financial position as of the date of adoption. The Company is currently evaluating the impact of the new guidance on the Company’s consolidated financial statements.

In March 2017, the FASB issued ASU No. 2017-08, “Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities.” This guidance shortens the amortization period for premiums on callable debt securities by requiring that premiums be amortized to the first (or earliest) call date instead of as an adjustment to the yield over the contractual life. This change more closely aligns the accounting with the economics of a callable debt security and the amortization period with expectations that already are included in market pricing on callable debt securities. This guidance does not change the accounting for discounts on callable debt securities, which will continue to be amortized to the maturity date. This guidance includes only instruments that are held at a premium and have explicit call features. It does not include instruments that contain prepayment features, such as mortgage backed securities; nor does it include call options that are contingent upon future events or in which the timing or amount to be paid is not fixed. The effective date for this guidance is fiscal years beginning after December 15, 2018, including interim periods within the reporting period, with early adoption permitted. Transition is on a modified retrospective basis with an adjustment to retained earnings as of the beginning of the period of adoption. If early adopted in an interim period, adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. The Company is currently evaluating the impact of the new guidance on the Company’s consolidated financial statements.

In March 2017, the FASB issued ASU No. 2017-07, "Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Post-retirement Benefit Cost", which requires that companies disaggregate the service cost component from other components of net benefit cost. This update calls for companies that offer post-retirement benefits to present the service cost, which is the amount an employer has to set aside each quarter or fiscal year to cover the benefits, in the same line item with other current employee compensation costs. Other components of net benefit cost will be presented in the income statement separately from service costs component and outside the subtotal of income from operations, if one is presented. This guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company is currently evaluating the impact of the new guidance on the Company’s consolidated financial statements and does not anticipate the new guidance to have a material impact.

In January 2017, the FASB issued ASU No. 2017-04, “Simplifying the Test for Goodwill Impairment.” The main objective of this guidance is to simplify the accounting for goodwill impairment by requiring that impairment charges be based upon the first step in the current two-step impairment test under Accounting Standards Codification (ASC) 350. Currently, if the fair value of a reporting unit is lower than its carrying amount (Step 1), an entity calculates any impairment charge by comparing the implied fair value of goodwill with its carrying amount (Step 2). The implied fair value of goodwill is calculated by deducting the fair value of all assets and liabilities of the reporting unit from the reporting unit’s fair value as determined in Step 1. To determine the implied fair value of goodwill, entities estimate the fair value of any unrecognized intangible assets and any corporate-level assets or liabilities that were included in the determination of the carrying amount and fair value of the reporting unit in Step 1. Under this guidance, if a reporting unit’s carrying amount exceeds its fair value, an entity will record an impairment charge based on that difference. The impairment charge will be limited to the amount of goodwill allocated to that reporting unit. This guidance eliminates the requirement to calculate a goodwill impairment

9

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

charge using Step 2. This guidance does not change the guidance on completing Step 1 of the goodwill impairment test. Under this guidance, an entity will still be able to perform the current optional qualitative goodwill impairment assessment before determining whether to proceed to Step 1. The guidance will be applied prospectively and is effective for annual and interim impairment tests performed in periods beginning after December 15, 2019. Early adoption is permitted for annual and interim goodwill impairment testing dates after January 1, 2017. The Company is currently evaluating the impact of the new guidance on the Company’s consolidated financial statements.

In August 2016, the FASB issued ASU No. 2016-15, "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments," a new standard which addresses diversity in practice related to eight specific cash flow issues: debt prepayment or extinguishment costs, settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance policies (including bank-owned life insurance policies), distributions received from equity method investees, beneficial interests in securitization transactions and separately identifiable cash flows and application of the predominance principle. This guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Entities will apply the standard’s provisions using a retrospective transition method to each period presented. If it is impracticable to apply the amendments retrospectively for some of the issues, the amendments for those issues would be applied prospectively as of the earliest date practicable. The Company is currently evaluating the impact of the new guidance on the Company’s consolidated financial statements and does not anticipate the new guidance to have a material impact.

In June 2016, the FASB issued ASU No. 2016-13, “Measurement of Credit Losses on Financial Instruments”. This guidance provides financial statement users with more decision-useful information about expected credit losses on financial instruments by a reporting entity at each reporting date. The amendments of this guidance require financial assets measured at amortized cost to be presented at the net amount expected to be collected. The allowance for credit losses would represent a valuation account that would be deducted from the amortized cost basis of the financial asset(s) to present the net carrying value at the amount expected to be collected on the financial asset. The income statement would reflect the measurement of credit losses that have taken place during the period. The measurement of expected credit losses would be based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. An entity would be required to use judgment in determining the relevant information and estimation methods that are appropriate in its circumstances. The guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within that reporting period, early adoption is permitted. The Company is currently evaluating its existing systems and data to support the new standard as well as assessing the impact that the guidance will have on the Company's consolidated financial statements. The Company has formed a working group under the direction of the Chief Accounting Officer that is primarily comprised of individuals from finance, credit, risk management, and operations. The Company has been developing an implementation plan as well as considering the use of consultants to aid in the implementation.

In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842)”. This guidance requires all lessees to recognize a lease liability and a right-of-use asset, measured at the present value of future minimum lease payments, at the lease commencement date. Lessor accounting remains largely unchanged under the new guidance. The guidance is effective for fiscal years beginning after December 15, 2018, including interim reporting periods within that reporting period, early adoption is permitted. A modified retrospective approach must be applied for leases existing at, or entered into after, the beginning of the earliest comparative period present in the financial statements. The Company is currently evaluating the impact of the new guidance on its consolidated financial statements by reviewing its existing lease contracts and service contracts.

In January 2016, the FASB issued ASU No. 2016-01, “Recognition and Measurement of Financial Assets and Financial Liabilities”. This guidance requires an entity to: i) measure equity investments at fair value through net income, with certain exceptions; (ii) present in other comprehensive income the changes in instrument-specific credit risk for financial liabilities measured using the fair value option; (iii) present financial assets and financial liabilities by measurement category and form of financial asset; (iv) calculate the fair value of financial instruments for disclosure purposes based on an exit price and; (v) assess a valuation allowance on deferred tax assets related to unrealized losses on available-for-sale debt securities in combination with other deferred tax assets. This guidance provides an election to subsequently measure certain nonmarketable equity investments at cost less any impairment and adjusted for certain observable price changes. The guidance also requires a qualitative impairment assessment of such equity investments and amends certain fair value disclosure requirements. The guidance is effective for annual periods beginning after December 15, 2017. The Company is currently evaluating the impact of the new guidance on the Company’s consolidated financial statements by evaluating its revenue streams and contracts potentially affected by the guidance.

10

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

In May 2014, the FASB issued ASU No. 2014-09, "Revenue from Contracts with Customers." The objective of this amendment is to clarify the principles for recognizing revenue and to develop a common revenue standard for U.S. GAAP and IFRS. This update affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are in the scope of other standards. The guidance is effective for public business entities for financial statements issued for fiscal years beginning after December 15, 2017, and early adoption is permitted. Subsequently, the FASB issued the following standards related to ASU No. 2014-09: ASU No. 2016-08, “Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations;” ASU No. 2016-10, “Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing;” ASU No. 2016-11, “Revenue Recognition (Topic 605) and Derivatives and Hedging (Topic 815): Rescission of SEC Guidance Because of ASU No. 2014-09 and 2014-16 Pursuant to Staff Announcements at the March 3, 2016 EITF Meeting;” and ASU No. 2016-12, “Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients”. These amendments are intended to improve and clarify the implementation guidance of ASU No. 2014-09 and have the same effective date as the original guidance. The Company's revenue is primarily comprised of net interest income on interest earning assets and liabilities and non-interest income. The scope of guidance explicitly excludes net interest income as well as other revenues associated with financial assets and liabilities, including loans, leases, securities and derivatives. The Company is currently evaluating the impact of the new guidance on the Company’s consolidated financial statements and does not anticipate the new guidance to have a material impact.

In March 2017, the FASB issued ASU No. 2017-08, Receivables-Nonrefundable Fees and Other Costs (Subtopic 310- 20): Premium Amortization on Purchased Callable Debt Securities. The amendments require the premium to be amortized to the earliest call date. The Company adopted ASU No. 2017-08 beginning October 1, 2017 and the impact was immaterial to the Company's financial statements.

4.Investment Securities

Securities Available-for-Sale

The following tables present the amortized cost, gross unrealized gains, gross unrealized losses and the fair value for securities available-for-sale at March 31, 2018 and September 30, 2017:

	March 31, 2018
	Amortized cost		Gross unrealized gains	Gross unrealized (losses)		Fair value
			(In thousands)
U.S. government and agency obligations	$	54,799	26	(928	)	$	53,897
Mortgage-backed securities and collateralized mortgage obligations	754,862		406	(20,069	)	735,199
Municipal obligations	1,295		—	—		1,295
Corporate debt securities	54,490		270	(748	)	54,012
Trust preferred securities	5,000		—	(348	)	4,652
Equity securities	2,328		830	—		3,158
	$	872,774	1,532	(22,093	)	$	852,213

11

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

	September 30, 2017
	Amortized cost		Gross unrealized gains	Gross unrealized (losses)		Fair value
			(In thousands)
U.S. government and agency obligations	$	24,954	35	(116	)	$	24,873
Mortgage-backed securities and collateralized mortgage obligations	479,927		652	(7,088	)	473,491
Municipal obligations	1,357		—	—		1,357
Corporate debt securities	49,489		536	(532	)	49,493
Trust preferred securities	5,000		—	(292	)	4,708
Equity securities	2,482		826	(54	)	3,254
	$	563,209	2,049	(8,082	)	$	557,176

The table below presents the amortized cost and fair value of debt securities available-for-sale at March 31, 2018 by contractual maturity excluding equity securities. Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer.

	March 31, 2018
	Amortized cost		Fair value
	(In thousands)
One year or less	$	1,104	$	1,105
More than one year to five years	45,121		44,385
More than five years to ten years	59,359		59,204
More than ten years	10,000		9,162
	$	115,584	$	113,856
Mortgage-backed securities and collateralized mortgage obligations	754,862		735,199
	$	870,446	$	849,055

Mortgage-backed securities and collateralized mortgage obligations totaling $754.9 million at amortized cost and $735.2 million at fair value are excluded from the maturity table above as their expected lives are likely to be shorter than the contractual maturity date due to principal prepayments.

For the three months ended March 31, 2018, proceeds from the sales of securities-available for sale totaled $9.7 million, resulting in $116 thousand of gross gains and zero losses. For the six months ended March 31, 2018, proceeds from sales of securities available-for-sale totaled $9.8 million, resulting in $116 thousand of gross gains and $61 thousand of gross losses.

There were no sales of securities from the available-for-sale investment portfolio for the three months ended March 31, 2017. For the six months ended March 31, 2017, proceeds from the sales of securities available-for-sale totaled $57.4 million, resulting in gross gains of $500 thousand and gross losses of $89 thousand.

Securities available-for-sale with a fair value of $187.6 million and $302.9 million at March 31, 2018 and September 30, 2017 were sold under agreements to repurchase or were pledged as security for deposits of public funds as required and permitted by law.

The following tables summarize the fair value and gross unrealized losses of those securities that reported an unrealized loss at March 31, 2018 and September 30, 2017 and if the unrealized loss position was continuous for the twelve months prior to March 31, 2018 and September 30, 2017:

12

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

	March 31, 2018
	Less than 12 months				12 months or longer			Total
	Fair Value		Gross unrealized (losses)		Fair value	Gross unrealized (losses)		Fair value	Gross unrealized (losses)
	(In thousands)
U.S. government and agency obligations	$	44,092	(722	)	4,774	(206	)	48,866	$	(928	)
Mortgage-backed securities and collateralized mortgage obligations	485,994		(11,572	)	156,550	(8,497	)	642,544	(20,069		)
Corporate debt securities	14,894		(98	)	9,351	(650	)	24,245	(748		)
Trust preferred securities	4,652		(348	)	—	—		4,652	(348		)
	$	549,632	(12,740	)	170,675	(9,353	)	720,307	$	(22,093	)

	September 30, 2017
	Less than 12 months				12 months or longer			Total
	Fair Value		Gross unrealized (losses)		Fair value	Gross unrealized (losses)		Fair value	Gross unrealized (losses)
	(In thousands)
U.S. government and agency obligations	$	14,831	(116	)	—	—		14,831	$	(116	)
Mortgage-backed securities and collateralized mortgage obligations	329,554		(5,346	)	49,695	(1,742	)	379,249	(7,088		)
Corporate debt securities	9,824		(176	)	9,644	(356	)	19,468	(532		)
Trust preferred securities	—		—		4,708	(292	)	4,708	(292		)
Equity securities	98		(54	)	—	—		98	(54		)
	$	354,307	(5,692	)	64,047	(2,390	)	418,354	$	(8,082	)

The Company evaluates securities for other-than-temporary impairment at each reporting period and more frequently when economic or market conditions warrant such evaluation. The temporary loss position associated with securities available-for-sale was the result of changes in market interest rates relative to the coupon of the individual security and changes in credit spreads. The Company does not have the intent to sell securities in a temporary loss position at March 31, 2018, nor is it more likely than not that the Company will be required to sell the securities before the anticipated recovery.

The Company did not record an other-than-temporary impairment charge on securities in the available-for-sale portfolio for the three and six months ended March 31, 2018 and 2017.

Securities Held-to-Maturity

The following tables present the amortized cost, gross unrealized gains, gross unrealized losses and the fair value for securities held-to-maturity at March 31, 2018 and September 30, 2017:

13

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

	March 31, 2018
	Amortized cost		Gross unrealized gains	Gross unrealized (losses)		Fair value
	(In thousands)
U.S. government and agency obligations	$	13,402	—	(243	)	$	13,159
Mortgage-backed securities and collateralized mortgage obligations	240,729		530	(8,941	)	232,318
	$	254,131	530	(9,184	)	$	245,477

	September 30, 2017
	Amortized cost		Gross unrealized gains	Gross unrealized (losses)		Fair value
	(In thousands)
U.S. government and agency obligations	$	3,407	—	(7	)	$	3,400
Mortgage-backed securities and collateralized mortgage obligations	129,532		—	(1,110	)	128,422
	$	132,939	—	(1,117	)	$	131,822

The table below presents the amortized cost and fair value of debt securities held-to-maturity at March 31, 2018 by contractual maturity. Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer.

	March 31, 2018
	Amortized cost		Fair value
	(In Thousands)
More than five years to ten years	$	13,402	$	13,159
	13,402		13,159
Mortgage-backed securities and collateralized mortgage obligations	240,729		232,318
	$	254,131	$	245,477

Mortgage-backed securities and collateralized mortgage obligations totaling $240.7 million at amortized cost and $232.3 million at fair value are excluded from the maturity table above as their expected lives are likely to be shorter than the contractual maturity date due to principal prepayments.

Securities held-to-maturity with a fair value of $124.6 million and zero at March 31, 2018 and September 30, 2017 were sold under agreements to repurchase or were pledged as security for deposits of public funds as required and permitted by law.

There were no sales of securities from the held-to-maturity investment portfolio for the three and six months ended March 31, 2018 and 2017.

The following tables summarize the fair value and gross unrealized losses of those securities that reported an unrealized loss at March 31, 2018 and September 30, 2017 and if the unrealized loss position was continuous for the twelve months prior to March 31, 2018 and September 30, 2017:

14

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

	March 31, 2018
	Less than 12 months				12 months or longer			Total
	Fair Value		Gross unrealized (losses)		Fair value	Gross unrealized (losses)		Fair value	Gross unrealized (losses)
	(In thousands)
U.S. government and agency obligations	$	8,160	(243	)	—	—		8,160	$	(243	)
Mortgage-backed securities and collateralized mortgage obligations	139,886		(4,300	)	69,110	(4,641	)	208,996	(8,941		)
	$	148,046	(4,543	)	69,110	(4,641	)	217,156	$	(9,184	)

	September 30, 2017
	Less than 12 months				12 months or longer			Total
	Fair Value		Gross unrealized (losses)		Fair value	Gross unrealized (losses)		Fair value	Gross unrealized (losses)
	(In thousands)
U.S. government and agency obligations	$	—	—		3,400	(7	)	3,400	$	(7	)
Mortgage-backed securities and collateralized mortgage obligations	29,965		(349	)	96,076	(761	)	126,041	(1,110		)
	$	29,965	(349	)	99,476	(768	)	129,441	$	(1,117	)

The Company evaluates securities for other-than-temporary impairment at each reporting period and more frequently when economic or market conditions warrant such evaluation. The temporary loss position associated with securities held-to-maturity was the result of changes in market interest rates relative to the coupon of the individual security and changes in credit spreads. The Company does not have the intent to sell securities in a temporary loss position at March 31, 2018, nor is it more likely than not that the Company will be required to sell the securities before the anticipated recovery.

The Company did not record an other-than-temporary impairment charge on securities in the held-to-maturity portfolio for the three and six months ended March 31, 2018 and 2017.

5.     Loans Receivable and Allowance for Loan Losses

Loans receivable at March 31, 2018 and September 30, 2017 are summarized as follows:

15

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

	March 31,			September 30,
	2018			2017
	(In thousands)
Real estate loans:
One-to-four family	$	1,689,375		$	1,578,835
Multifamily and commercial	1,888,745			1,821,982
Construction	241,699			218,408
Commercial business loans	273,325			267,664
Consumer loans:
Home equity loans and advances	433,108			464,962
Other consumer loans	1,339			1,270
Total loans	4,527,591			4,353,121
Net deferred loan costs	12,280			9,135
Allowance for loan losses	(59,952		)	(54,633		)
Loans receivable, net	$	4,479,919		$	4,307,623

The Company had no loans held for sale at March 31, 2018 and September 30, 2017.

The Company purchased $2.7 million of residential loans and $2.1 million of commercial real estate loans from third parties during the three months ended March 31, 2018. The Company purchased $7.4 million of residential loans from third parties during the three months ended March 31, 2017. During the six months ended March 30, 2018, the Company purchased $8.9 million of residential loans and $51.9 million of commercial real estate loans. During the six months ended March 31, 2017, the total residential loans purchased were $16.8 million.

At March 31, 2018 and September 30, 2017, the carrying value of real estate loans serviced by the Company for investors was $464.3 million and $493.2 million, respectively.

The following tables summarize the aging of loans receivable by portfolio segment at March 31, 2018 and September 30, 2017:

	March 31, 2018
	30-59 days		60-89 days	Greater than 90 days	Total past due	Current	Total
	(In Thousands)
Real estate loans:
One to four family	$	5,201	1,706	2,565	9,472	1,679,903	$	1,689,375
Multifamily and commercial	504		—	118	622	1,888,123	1,888,745
Construction	—		—	—	—	241,699	241,699
Commercial business loans	355		—	407	762	272,563	273,325
Consumer loans:
Home equity loans advances	797		321	636	1,754	431,354	433,108
Other consumer loans	—		7	—	7	1,332	1,339
Total loans	$	6,857	2,034	3,726	12,617	4,514,974	$	4,527,591

16

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

	September 30, 2017
	30-59 days		60-89 days	Greater than 90 days	Total past due	Current	Total
	(In thousands)
Real estate loans:
One to four family	$	3,924	932	3,496	8,352	1,570,483	$	1,578,835
Multifamily and commercial	—		123	1,510	1,633	1,820,349	1,821,982
Construction	—		—	—	—	218,408	218,408
Commercial business loans	—		388	1,038	1,426	266,238	267,664
Consumer loans:
Home equity loans advances	1,437		187	351	1,975	462,987	464,962
Other consumer loans	1		—	—	1	1,269	1,270
Total loans	$	5,362	1,630	6,395	13,387	4,339,734	$	4,353,121

The Company considers a loan to be delinquent when we have not received a payment within 30 days of its contractual due date. A loan is designated as a non-accrual loan when the payment of interest is more than three months in arrears of its contractual due date. The accrual of income on a non-accrual loan is reversed and discontinued until the outstanding payments in arrears have been collected. The Company identifies loans that may need to be charged-off as a loss by reviewing all delinquent loans, classified loans and other loans that management may have concerns about collectability.

At March 31, 2018 and September 30, 2017, there were no loans past due 90 days or more and still accruing interest.

17

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

The following table summarizes loans receivable and allowance for loan losses by portfolio segment and impairment method:

	March 31, 2018
	One to four family		Multifamily and commercial	Construction	Commercial Business	Home equity loans and advances	Other consumer	Unallocated	Total
	(In thousands)
Allowance for loan losses:
Individually evaluated for impairment	$	510	—	—	369	12	—	—	$	891
Collectively evaluated for impairment	18,318		19,097	6,574	10,431	3,912	7	722	59,061
Total	$	18,828	19,097	6,574	10,800	3,924	7	722	$	59,952
Total loans:
Individually evaluated for impairment	$	10,825	2,579	—	3,409	3,083	—	—	$	19,896
Collectively evaluated for impairment	1,678,550		1,886,166	241,699	269,916	430,025	1,339	—	4,507,695
Total	$	1,689,375	1,888,745	241,699	273,325	433,108	1,339	—	$	4,527,591

	September 30, 2017
	One to four family		Multifamily and commercial	Construction	Commercial Business	Home equity loans and advances	Other consumer	Unallocated	Total
	(In thousands)
Allowance for loan losses:
Individually evaluated for impairment	$	407	35	—	84	14	—	—	$	540
Collectively evaluated for impairment	18,126		17,994	5,299	8,396	4,176	8	94	54,093
Total	$	18,533	18,029	5,299	8,480	4,190	8	94	$	54,633
Total loans:
Individually evaluated for impairment	$	12,247	6,343	—	4,327	2,998	—	—	$	25,915
Collectively evaluated for impairment	1,566,588		1,815,639	218,408	263,337	461,964	1,270	—	4,327,206
Total	$	1,578,835	1,821,982	218,408	267,664	464,962	1,270	—	$	4,353,121

18

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

Loan modifications to borrowers experiencing financial difficulties that are considered Troubled Debt Restructurings ("TDRs") primarily involve the lowering of the monthly payments on such loans through either a reduction in interest rate below a market rate, an extension of the term of the loan without a corresponding adjustment to the risk premium reflected in the interest rate, or a combination of these two methods. These modifications generally do not result in the forgiveness of principal or accrued interest. In addition, the Company attempts to obtain additional collateral or guarantor support when modifying such loans. Non-accruing restructured loans may be returned to accrual status when there has been a sustained period of repayment performance (generally six consecutive months of payments) and both principal and interest are deemed collectible.

The following tables present the number of loans modified as TDRs during the three and six months ended March 31, 2018 and 2017, along with their balances immediately prior to the modification date and post-modification. Post-modification recorded investment represents the net book balance immediately following modification.

	For the Three Months Ended
	March 31, 2018					March 31, 2017
	No. of Loans	Pre-modification recorded investment		Post-modification recorded investment		No. of Loans	Pre-modification recorded investment		Post-modification recorded investment
		(In thousands)					(In thousands)
Troubled Debt Restructurings
Real estate loans:
One to four family	1	$	588	$	588	1	$	83	$	83
Consumer loans:
Home equity loans and advances	1	84		84		—	—		—
Total loans	2	$	672	$	672	1	$	83	$	83

	For the Six Months Ended
	March 31, 2018					March 31, 2017
	No. of Loans	Pre-modification recorded investment		Post-modification recorded investment		No. of Loans	Pre-modification recorded investment		Post-modification recorded investment
		(In thousands)					(In thousands)
Troubled Debt Restructurings
Real estate loans:
One to four family	1	$	588	$	588	3	$	340	$	340
Home equity loans and advances	1	84		84		1	108		108
Total loans	2	$	672	$	672	4	$	448	$	448

19

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

The activity in the allowance for loan losses by portfolio segment for the three and six months ended March 31, 2018 and 2017 was as follows:

	For the Three Months Ended March 31,
	One to four family			Multifamily and commercial		Construction		Commercial Business		Home equity loans and advances		Other consumer		Unallocated		Total
	(In Thousands)
2018
Balance at beginning of period	$	19,991		19,933		5,217		8,275		4,576		8		178		$	58,178
Provision charged (credited)	(1,229		)	(707	)	1,354		2,697		(657	)	(2	)	544		2,000
Recoveries	120			—		3		52		5		1		—		181
Charge-offs	(54		)	(129	)	—		(224	)	—		—		—		(407		)
Balance at end of period	$	18,828		19,097		6,574		10,800		3,924		7		722		$	59,952
2017
Balance at beginning of period	$	18,599		17,616		4,598		6,358		4,231		11		436		$	51,849
Provision charged (credited)	380			189		(345	)	579		(39	)	1		(390	)	375
Recoveries	22			—		—		77		7		—		—		106
Charge-offs	(183		)	(167	)	—		—		(70	)	(2	)	—		(422		)
Balance at end of period	$	18,818		17,638		4,253		7,014		4,129		10		46		$	51,908

20

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

	For the Six Months Ended March 31,
	One to four family			Multifamily and commercial		Construction		Commercial Business		Home equity loans and advances		Other consumer		Unallocated		Total
2018
Balance at beginning of period	$	18,533		18,029		5,299		8,480		4,190		8		94		$	54,633
Provision charged (credited)	245			1,199		1,272		2,322		(267	)	1		628		5,400
Recoveries	130			—		3		225		10		3		—		371
Charge-offs	(80		)	(131	)	—		(227	)	(9	)	(5	)	—		(452		)
Balance at end of period	$	18,828		19,097		6,574		10,800		3,924		7		722		$	59,952
2017
Balance at beginning of period	$	18,638		17,390		5,960		4,052		5,721		11		95		$	51,867
Provision charged (credited)	353			415		(1,707	)	2,889		(1,531	)	5		(49	)	375
Recoveries	26			—		—		96		13		—		—		135
Charge-offs	(199		)	(167	)	—		(23	)	(74	)	(6	)	—		(469		)
Balance at end of period	$	18,818		17,638		4,253		7,014		4,129		10		46		$	51,908

21

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

The following table presents loans individually evaluated for impairment by loan segment:

	March 31, 2018
	Recorded investment		Unpaid principal balance		Specific allowance
	(In thousands)
With no allowance recorded:
Real estate loans:
One to four family	$	7,955	$	9,143	$	—
Multifamily and commercial	2,579		3,454		—
Commercial business loans	426		119		—
Consumer loans:
Home equity loans and advances	2,733		3,088		—
	13,693		15,804		—
With a specific allowance recorded:
Real estate loans:
One to four family	2,870		2,913		510
Commercial business loans	2,983		2,774		369
Consumer loans:
Home equity loans and advances	350		350		12
	6,203		6,037		891
Total:
Real estate loans:
One to four family	10,825		12,056		510
Multifamily and commercial	2,579		3,454		—
Commercial business loans	3,409		2,893		369
Consumer loans:
Home equity loans and advances	3,083		3,438		12
Total loans	$	19,896	$	21,841	$	891

22

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

	September 30, 2017
	Recorded investment		Unpaid principal balance		Specific allowance
	(In thousands)
With no allowance recorded:
Real estate loans:
One to four family	$	9,272	$	10,156	$	—
Multifamily and commercial	4,701		5,577		—
Commercial business loans	1,545		2,038		—
Consumer loans:
Home equity loans and advances	2,745		3,214		—
	18,263		20,985		—
With a specific allowance recorded:
Real estate loans:
One to four family	2,975		2,989		407
Multifamily and commercial	1,642		2,215		35
Commercial business loans	2,782		2,782		84
Consumer loans:
Home equity loans and advances
	253		253		14
Total:	7,652		8,239		540
Real estate loans:
One to four family	12,247		13,145		407
Multifamily and commercial	6,343		7,792		35
Commercial business loans	4,327		4,820		84
Consumer loans:
Home equity loans and advances	2,998		3,467		14
Total loans	$	25,915	$	29,224	$	540

Specific allocations of the allowance for loan losses attributable to impaired loans totaled $891 thousand and $540 thousand at March 31, 2018 and September 30, 2017, respectively. At March 31, 2018 and September 30, 2017, impaired loans for which there was no related allowance for loan losses totaled $13.7 million and $18.3 million, respectively.

23

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

The following table presents interest income recognized for loans individually evaluated for impairment by loan segment for the three and six months ended March 31, 2018 and 2017:

	For the Three Months Ended
	March 31, 2018				March 31, 2017
	Average recorded Investment		Interest Income Recognized		Average recorded Investment		Interest Income Recognized
	(In thousands)				(In thousands)
Real estate loans:
One to four family	$	11,235	$	102	$	16,061	$	142
Multifamily and commercial	3,136		26		3,825		14
Commercial business loans	3,836		26		3,797		26
Consumer loans:
Home equity loans and advances	2,837		36		4,122		35
Total loans	$	21,044	$	190	$	27,805	$	217

	For the Six Months Ended
	March 31, 2018				March 31, 2017
	Average recorded Investment		Interest Income Recognized		Average recorded Investment		Interest Income Recognized
	(In thousands)				(In thousands)
Real estate loans:
One to four family	$	11,572	$	212	$	16,747	$	260
Multifamily and commercial	4,205		65		5,665		84
Construction	—		—		168		—
Commercial business loans	4,000		72		4,036		75
Consumer loans:
Home equity loans and advances	2,891		71		3,897		69
Total loans	$	22,668	$	420	$	30,513	$	488

The Company utilizes an internal eight-point risk rating system to summarize its loan portfolio into categories with similar risk characteristics. Loans deemed to be “acceptable quality” are rated 1 through 4, with a rating of 1 established for loans with minimal risk. Loans that are deemed to be of “questionable quality” are rated 5 (Special Mention) or 6 (Substandard). Loans with adverse classifications are rated 7 (Doubtful) or 8 (Loss). The risk ratings are also confirmed through periodic loan review examinations which are currently performed by both an independent third-party and the Company's internal loan review department. Results from examinations are presented to the Audit Committee of the Board of Directors.

24

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

The following table presents loans receivable by credit quality risk indicator and by loan segment:

	March 31, 2018
	Real Estate
	One to four family		Multifamily and commercial	Construction	Commercial Business	Home equity loans and advances	Other consumer	Total
	(In thousands)
Pass	$	1,680,034	1,871,631	241,699	265,153	431,096	1,339	$	4,490,952
Special mention	—		3,764	—	3,619	—	—	7,383
Substandard	9,341		13,350	—	4,553	2,012	—	29,256
Doubtful	—		—	—	—	—	—	—
Total	$	1,689,375	1,888,745	241,699	273,325	433,108	1,339	$	4,527,591

	September 30, 2017
	Real Estate
	One to four family		Multifamily and commercial	Construction	Commercial Business	Home equity loans and advances	Other consumer	Total
	(In thousands)
Pass	$	1,569,064	1,796,786	218,408	258,454	463,257	1,270	$	4,307,239
Special mention	—		11,600	—	3,347	—	—	14,947
Substandard	9,771		13,596	—	5,863	1,705	—	30,935
Doubtful	—		—	—	—	—	—	—
Total	$	1,578,835	1,821,982	218,408	267,664	464,962	1,270	$	4,353,121

6.     Deposits

Deposits at March 31, 2018 and September 30, 2017 are summarized as follows:

	March 31,		September 30,
	2018		2017
	(In Thousands)
Non-interest bearing transaction	$	709,684	$	676,067
Interest bearing transaction	1,411,361		1,268,833
Money market deposit accounts	358,818		273,605
Savings, including club deposits	1,490,173		546,449
Certificates of deposit	1,425,217		1,358,474
Total deposits	$	5,395,253	$	4,123,428

The increase in deposits during the six months ended March 31, 2018 was primarily the result of subscription funds received in connection with the Company's minority public offering.

The aggregate amount of certificates of deposit that meet or exceed $100,000 is approximately $656.8 million and $608.5 million as of March 31, 2018 and September 30, 2017, respectively.

A summary of certificate accounts by maturity at March 31, 2018 and September 30, 2017 are summarized as follows:

	March 31,		September 30,
	2018		2017
	(In Thousands)
Less than one year	$	693,173	$	657,741
More than one years to two years	492,169		338,265
More than two years to three years	160,472		248,779
More than three years to four years	59,663		81,959
More than four years	19,740		31,730
	$	1,425,217	$	1,358,474

7.Components of Periodic Benefit Costs

The Bank has a defined benefit pension plan (the "Pension Plan") covering its full-time employees who satisfy the eligibility requirements. The benefits are based on years of service and the employee's compensation during the last five years of employment. Costs of the Pension Plan, based on the actuarial computations of the current future benefits for employees, are recognized to expense

25

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

and are funded in part based on the maximum amount that can be deducted for federal income tax purposes. The Pension Plan’s assets are primarily invested in fixed debt and equity securities.

In addition to the Pension Plan, certain health care and life insurance benefits are made available to retirement employees (the "Post-retirement Plan").

The Bank has a retirement income maintenance plan (the "RIM Plan"). The RIM Plan is a non-qualified defined benefit plan which provides benefits to all employees of the Bank if their benefits under the Pension Plan are limited by the Internal Revenue Code Sections 415 and 401(a)(17).

Net periodic benefit cost (income) for pension benefits and other benefits for the three and six months ended March 31, 2018 and 2017 includes the following components:

	For the Three Months Ended March 31,
	Pension						RIM				Post-retirement
	2018			2017			2018		2017		2018			2017
	(In thousands)
Service cost	$	1,780		$	1,905		$	61	$	59	$	93		$	118
Interest cost	2,129			2,111			111		107		205			186
Expected return on plan assets	(4,815		)	(6,202		)	—		—		—			—
Amortization:
Prior service cost	—			—			—		—		(34		)	(34		)
Net loss	707			2,750			103		113		69			81
Net periodic cost (income)	$	(199	)	$	564		$	275	$	279	$	333		$	351

	For the Six Months Ended March 31,
	Pension				RIM		Post-retirement
	2018		2017		2018	2017	2018		2017
	(In thousands)
Service cost	3,560		3,811		122	119	186		236
Interest cost	4,258		4,222		222	215	410		371
Expected return on plan assets	(9,630	)	(12,405	)	—	—	—		—
Amortization:
Prior service cost	—		—		—	—	(68	)	(68	)
Net loss	1,414		5,499		206	227	138		163
Net periodic cost (income)	(398	)	1,127		550	561	666		702

The net periodic benefit cost (income) for pension benefits and other benefits at March 31, 2018 were calculated using the December 31, 2017 third party actuarial valuation reports. For March 31, 2017, the September 30, 2017 third party actuarial valuation reports were utilized as a proxy to estimate the net periodic benefit cost for pension benefits.

8.    Fair Value Measurements

The Company utilizes fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. The determination of fair values of financial instruments often requires the use of estimates. Where quoted market values in an active market are not readily available, the Company utilizes various valuation techniques to estimate fair value.

Fair value is an estimate of the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. However, in many instances, fair value estimates may not be substantiated by comparison to independent markets and may not be realized in an immediate sale of the financial instrument.

26

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

U.S. GAAP establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of fair value hierarchy are as follows:

Level 1:     Unadjusted quoted market prices in active markets that are accessible at the measurement date for identical,

unrestricted assets or liabilities;

Level 2: Quoted prices in markets that are not active, or inputs that are observable either directly or indirectly for

substantially the full term of the asset or liability; and

Level 3: Prices or valuation techniques that require inputs that are both significant to the fair value measurement and

unobservable (i.e., supported by minimal or no market activity).

A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement.

The valuation techniques are based upon the unpaid principal balance only and exclude any accrued interest or dividends at the measurement date. Interest income and expense and dividend income are recorded within the consolidated statements of income depending on the nature of the instrument using the effective interest method based on the discount or premium.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The valuation techniques described below were used to measure fair value of financial instruments in the tables below on a recurring basis as of March 31, 2018 and September 30, 2017.

Securities Available-for-Sale

For securities available-for-sale, fair value was estimated using a market approach. The majority of the Company’s securities are fixed income instruments that are not quoted on an exchange, but are traded in active markets. Prices for these instruments are obtained through third-party data service providers or dealer market participants with which the Company has historically transacted both purchases and sales of securities. Prices obtained from these sources include market quotations and matrix pricing. Matrix pricing, a Level 2 input, is a mathematical technique used principally to value certain securities to benchmark or to comparable securities. The Company evaluates the quality of Level 2 matrix pricing through comparison to similar assets with greater liquidity and evaluation of projected cash flows. As the Company is responsible for the determination of fair value, it performs quarterly analysis on the prices received from the pricing service to determine whether the prices are reasonable estimates of fair value. Specifically, the Company compares the prices received from the pricing service to a secondary pricing source. Additionally, the Company compares changes in the reported market values and returns to relevant market indices to assess the reasonableness of the reported prices. The Company’s internal price verification procedures and review of fair value methodology documentation provided by independent pricing services has not historically resulted in an adjustment in the prices obtained from the pricing service. The Company also holds equity securities and debt instruments issued by the U.S. government and U.S. government-sponsored agencies that are traded in active markets with readily accessible quoted market prices that are considered Level 1 inputs.

Derivatives

The Company records all derivatives on the consolidated balance sheets at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting.

The fair value of the Company's derivatives are determined using discounted cash flow analysis using observable market-based inputs, which are considered Level 2 inputs.

Assets Measured at Fair Value on a Non-Recurring Basis

The valuation techniques described below were used to estimate fair value of financial instruments measured on a non-recurring basis as of March 31, 2018 and September 30, 2017.

27

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

Collateral Dependent Impaired Loans

For loans measured for impairment based on the fair value of the underlying collateral, fair value was estimated using a market approach. The Company measures the fair value of collateral underlying impaired loans primarily through obtaining independent appraisals that rely upon quoted market prices for similar assets in active markets. These appraisals include adjustments, on an individual case-by-case basis, to comparable assets based on the appraisers’ market knowledge and experience, as well as adjustments for estimated costs to sell between 6% and 8%. The Company classifies these loans as Level 3 within the fair value hierarchy.

Foreclosed Assets

Assets acquired through foreclosure or deed in lieu of foreclosure are carried at fair value, less estimated selling costs which is estimated to be 6%. Fair value is generally based on independent appraisals that rely upon quoted market prices for similar assets in active markets. These appraisals include adjustments, on an individual case basis, to comparable assets based on the appraiser's market knowledge and experience, and are classified as Level 3. When an asset is acquired, the excess of the loan balance over fair value less estimated selling costs is charged to the allowance for loan losses. Operating results from real estate owned, including rental income, operating expenses, and gains and losses realized from the sales of real estate owned, are recorded as incurred.

There were no changes to the valuation techniques for fair value measurements as of March 31, 2018 and September 30, 2017.

The following tables present the assets and liabilities reported on the consolidated balance sheets at their fair values as of March 31, 2018 and September 30, 2017, by level within the fair value hierarchy:

	March 31, 2018
			Fair value measurements
	Fair value		Quoted prices in active markets for identical assets (Level 1)	Significant other observable inputs (Level 2)	Significant unobservable inputs (Level 3)
	(In thousands)
Measured on a recurring basis:
Securities available-for-sale:
U.S. government and agency obligations	$	53,897	53,897	—	$	—
Mortgage-backed securities and collateralized mortgage obligations	735,199		—	735,199	—
Municipal obligations	1,295		—	1,295	—
Corporate debt securities	54,012		—	54,012	—
Trust preferred securities	4,652		—	4,652	—
Equity securities	3,158		3,158	—	—
Total securities available-for-sale	$	852,213	57,055	795,158	$	—
Derivative assets	669		—	669	—
	$	852,882	57,055	795,827	$	—

28

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

	September 30, 2017
			Fair value measurements
	Fair value		Quoted prices in active markets for identical assets (Level 1)	Significant other observable inputs (Level 2)	Significant unobservable inputs (Level 3)
	(In thousands)
Measured on a recurring basis:
Securities available-for-sale:
U.S. government and agency obligations	$	24,873	24,873	—	$	—
Mortgage-backed securities and collateralized mortgage obligations	473,491		—	473,491	—
Municipal obligations	1,357		—	1,357	—
Corporate debt securities	49,493		—	49,493	—
Trust preferred securities	4,708		—	4,708	—
Equity securities	3,254		3,254	—	—
Total securities available-for-sale	557,176		28,127	529,049	—
Derivative assets	277		—	277	—
	$	557,453	28,127	529,326	$	—
Derivative liabilities	$	182	—	182	$	—

There were no transfers between Level 1, Level 2 and Level 3 during the three and six months ended March 31, 2018 and during the year-ended September 30, 2017.

	March 31, 2018
			Fair value measurements
	Fair value		Quoted prices in active markets for identical assets (Level 1)	Significant other observable inputs (Level 2)	Significant unobservable inputs (Level 3)
	(In thousands)
Measured on a non-recurring basis:
Real estate owned	$	959	—	—	$	959
Loans measured for impairment based on the fair value of the underlying collateral	9,449		—	—	9,449
	$	10,408	—	—	$	10,408

29

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

	September 30, 2017
			Fair value measurements
	Fair value		Quoted prices in active markets for identical assets (Level 1)	Significant other observable inputs (Level 2)	Significant unobservable inputs (Level 3)
	(In thousands)
Measured on a non-recurring basis:
Real estate owned	$	393	—	—	$	393
Loans measured for impairment based on the fair value of the underlying collateral	14,156				14,156
	$	14,549	—	—	$	14,549

The following table presents qualitative information for Level 3 assets measured at fair value on a non-recurring basis as of March 31, 2018 and September 30, 2017:

	March 31, 2018
	Fair value		Valuation methodology	Unobservable inputs	Range of inputs
	(In Thousands)
Real estate owned	$	959	Appraised Value	Discount for cost to sell	6.0%
Loans measured for impairment based on the fair value of the underlying collateral	$	9,449	Appraised Value	Discount for cost to sell	6.0% - 8.0%

	September 30, 2017
	Fair value		Valuation methodology	Unobservable inputs	Range of inputs
	(In Thousands)
Real estate owned	$	393	Appraised Value	Discount for cost to sell	6.0%
Loans measured for impairment based on the fair value of the underlying collateral	$	14,156	Appraised Value	Discount for cost to sell	6.0% - 8.0%

Other Fair Value Disclosures

The Company is required to disclose estimated fair value of financial instruments, both assets and liabilities on and off the balance sheet, for which it is practicable to estimate fair value. A description of the valuation methodologies used for those assets and liabilities not recorded at fair value on a recurring or non-recurring basis are set forth below.

Cash and Cash Equivalents

For cash and due from banks, federal funds sold and short-term investments, the carrying amount approximates fair value due to their nature and short-term maturities.

Investment Securities Held-to-Maturity

For securities held-to-maturity, fair value was estimated using a market approach. The majority of the Company’s securities are fixed income instruments that are not quoted on an exchange, but are traded in active markets. Prices for these instruments are obtained through third-party data service providers or dealer market participants with which the Company has historically transacted both purchases and sales of securities. Prices obtained from these sources include market quotations and matrix pricing. Matrix pricing, a Level 2 input, is a mathematical technique used principally to value certain securities to benchmark or to compare securities. The Company evaluates the quality of Level 2 matrix pricing through comparison to similar assets with greater liquidity and evaluation of projected cash flows. As the Company is responsible for the determination of fair value, it performs quarterly analysis on the prices received from the pricing service to determine whether the prices are reasonable estimates of fair value. Specifically, the

30

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

Company compares the prices received from the pricing service to a secondary pricing source. Additionally, the Company compares changes in the reported market values and returns to relevant market indices to assess the reasonableness of the reported prices. The Company’s internal price verification procedures and review of fair value methodology documentation provided by independent pricing services has not historically resulted in an adjustment in the prices obtained from the pricing service. The Company also holds debt instruments issued by the U.S. government and U.S. government-sponsored agencies that are traded in active markets with readily accessible quoted market prices that are considered Level 1 inputs.

Federal Home Loan Bank Stock ("FHLB")

The carrying value of FHLB stock is its cost. The fair value of FHLB stock is based on redemption at par value. The Company classifies the estimated fair value as Level 2 within the fair value hierarchy.

Loans Receivable

Fair values are estimated for portfolios of loans with similar financial characteristics. Loans are segregated by type such as commercial mortgage, residential mortgage, commercial, construction, etc. Each applicable loan category is further segmented into fixed and adjustable rate interest terms and into performing and non-performing categories. The fair value of performing loans is estimated using a combination of techniques, including a discounted cash flow model that utilizes a discount rate that reflects the Company’s current pricing for loans with similar characteristics and remaining maturity, adjusted by an amount for estimated credit losses inherent in the portfolio at the balance sheet date. The rates take into account the expected yield curve, as well as an adjustment for prepayment risk, when applicable. The fair value estimated does not incorporate an exit value. The Company classifies the estimated fair value of its loan portfolio as Level 3.

The fair value for non-performing loans was based on recent external appraisals of collateral securing such loans, adjusted for the timing of anticipated cash flows. The Company classifies the estimated fair value of its non-performing loan portfolio as Level 3.

Deposits

The fair value of deposits with no stated maturity, such as non-interest bearing demand deposits and savings deposits, was equal to the amount payable on demand and classified as Level 2. The estimated fair value of certificates of deposit was based on the discounted value of contractual cash flows. The discount rate was estimated using the Company’s current rates offered for deposits with similar remaining maturities. The Company classifies the estimated fair value of its certificates of deposit portfolio as Level 2.

Borrowed Funds

The fair value of borrowed funds was estimated by discounting future cash flows using rates available for debt with similar terms and maturities and is classified by the Company as Level 2 within the fair value hierarchy.

Commitments to Extend Credit and Letters of Credit

The fair value of commitments to extend credit and letters of credit was estimated using the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the present creditworthiness of the counter-parties. For fixed rate loan commitments, fair value also considers the difference between current levels of interest rates and the committed rates. The fair value estimates of commitments to extend credit and letters of credit are deemed immaterial in comparison to their carrying value.

The following tables present the assets and liabilities reported on the consolidated balance sheets at their fair values as of March 31, 2018 and September 30, 2017:

31

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

	March 31, 2018
			Fair Value Instruments
	Carrying Value		Total Fair Value	Quoted prices in active markets for identical assets (Level 1)	Significant other observable inputs (Level 2)	Significant unobservable inputs (Level 3)
	(In thousands)
Financial assets:
Cash and cash equivalents	$	634,381	634,381	634,381	—	$	—
Securities available-for-sale	852,213		852,213	57,055	795,158	—
Securities held-to-maturity	254,131		245,477	—	245,477	—
Federal Home Loan Bank stock	29,381		29,381	—	29,381	—
Loans receivable, net	4,479,919		4,390,761	—	—	4,390,761
Derivative assets	669		669	—	669	—
Financial liabilities:			—
Total deposits	$	5,395,253	5,382,310	—	5,382,310	$	—
Borrowings	589,430		532,051	—	532,051	—

	September 30, 2017
			Fair Value Instruments
	Carrying Value		Total Fair Value	Quoted prices in active markets for identical assets (Level 1)	Significant other observable inputs (Level 2)	Significant unobservable inputs (Level 3)
	(In thousands)
Financial assets:
Cash and cash equivalents	$	100,975	100,975	100,975	—	$	—
Securities available-for-sale	557,176		557,176	28,127	529,049	—
Securities held-to-maturity	132,939		131,822	—	131,822	—
Federal Home Loan Bank Stock	35,844		35,844	—	35,844	—
Loans receivable, net	4,307,623		4,301,138	—	—	4,301,138
Derivative assets	277		277	—	277	—
Financial liabilities:			—
Total deposits	$	4,123,428	3,880,363	—	3,880,363	$	—
Borrowings	733,043		732,731	—	732,731	—
Derivative liabilities	182		182	—	182	—

Limitations

Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument. Because no market exists for a significant portion of the Company’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments, and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and, therefore, cannot be determined with precision. Changes in assumptions could significantly affect the estimates.

32

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

Fair value estimates are based on existing balance sheet financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments. Significant assets and liabilities that are not considered financial assets or liabilities include goodwill and other intangibles, deferred tax assets and premises and equipment. In addition, the tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in the estimates.

9.Other Comprehensive Income (Loss)

The following tables present the components of other comprehensive income (loss), both gross and net of tax, for the three and six months ended March 31, 2018 and 2017:

	For the Three Months Ended
	March 31, 2018							March 31, 2017
	Before Tax			Tax Effect		After Tax		Before Tax		Tax Effect		After Tax
	(In thousands)
Components of Other Comprehensive (Loss) Income:
Unrealized gains and losses on securities available-for-sale:
Net losses arising during the period	$	(11,594	)	1,609		(9,985	)	651		(257	)	$	394
Accretion of unrealized loss on securities reclassified as held-to-maturity	(17		)	36		19		—		—		—
Reclassification adjustment for gains included in net income	116			(28	)	88		—		—		—
	(11,495		)	1,617		(9,878	)	651		(257	)	394
Unrealized gain on swap contract	382			(40	)	342		9		(3	)	6
	382			(40	)	342		9		(3	)	6
Employee benefit plans:
Amortization of prior service cost included in net income	(24		)	(19	)	(43	)	(28	)	10		(18		)
Reclassification adjustment of actuarial net (loss) gain included in net income	(8		)	(94	)	(102	)	7		(2	)	5
Change in funded status of retirement obligations	33			(301	)	(268	)	21		(156	)	(135		)
	1			(414	)	(413	)	—		(148	)	(148		)
Total other comprehensive (loss) income	$	(11,112	)	1,163		(9,949	)	660		(408	)	$	252

33

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

	For the Six Months Ended
	March 31, 2018							March 31, 2017
	Before Tax			Tax Effect		After Tax		Before Tax		Tax Effect		After Tax
	(In thousands)
Components of Other Comprehensive (Loss) Income:
Unrealized gains and losses on securities available-for-sale:
Net losses arising during the period	$	(14,584	)	1,454		(13,130	)	(23,012	)	8,197		$	(14,815	)
Accretion of unrealized loss on securities reclassified as held-to-maturity	(73		)	90		17		—		—		—
Reclassification adjustment for gains included in net income	55			(27	)	28		411		(144	)	267
	(14,602		)	1,517		(13,085	)	(22,601	)	8,053		(14,548		)
Unrealized loss on swap contract	669			(164	)	505		9		(4	)	5
	669			(164	)	505		9		(4	)	5
Employee benefit plans:
Amortization of prior service cost included in net income	(47		)	(38	)	(85	)	(57	)	20		(37		)
Reclassification adjustment of actuarial net loss included in net income	(18		)	(187	)	(205	)	15		(4	)	11
Change in funded status of retirement obligations	(10,664		)	4,788		(5,876	)	42		(25	)	17
Tax effects resulting from the adoption of ASU No. 2018-02	—			(10,434	)	(10,434	)	—		—		—
	(10,729		)	(5,871	)	(16,600	)	—		(9	)	(9		)
Total other comprehensive (loss)	$	(24,662	)	(4,518	)	(29,180	)	(22,592	)	8,040		$	(14,552	)

34

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

The Company, in accordance with ASU No. 2018-02, has elected to reclassify the income tax effects of the Tax Act from accumulated other comprehensive (loss) income to retained earnings for the six months ended March 31, 2018. The following tables present the changes in the components of accumulated other comprehensive (loss) income, net of tax, for the three and six months ended March 31, 2018 and 2017:

	For the Three Months Ended
	March 31, 2018								March 31, 2017
	Unrealized Gains on Securities Available-for- Sale			Swaps	Employee Benefit Plans		Accumulated Other Comprehensive Loss		Unrealized Gains on Securities Available-for-Sale		Swaps	Employee Benefit Plans		Accumulated Other Comprehensive Loss
	(In Thousands)								(In Thousands)
Balance at beginning of year	$	(7,345	)	224	(58,290	)	(65,411	)	(9,279	)	—	(56,883	)	$	(66,162	)
Current period changes in other comprehensive (loss) income	(9,878		)	342	(413	)	(9,949	)	394		6	(148	)	252
Total other comprehensive (loss) income	$	(17,223	)	566	(58,703	)	(75,360	)	(8,885	)	6	(57,031	)	$	(65,910	)

	For the Six Months Ended
	March 31, 2018								March 31, 2017
	Unrealized Gains on Securities Available-for-Sale			Swaps	Employee Benefit Plans		Accumulated Other Comprehensive Loss		Unrealized Gains on Securities Available-for-Sale		Swaps	Employee Benefit Plans		Accumulated Other Comprehensive Loss
	(In Thousands)								(In Thousands)
Balance at beginning of year	$	(4,075	)	—	(42,105	)	(46,180	)	5,664		—	(57,022	)	$	(51,358	)
Current period changes in other comprehensive (loss) income	(11,771		)	465	(6,166	)	(17,472	)	(14,548	)	5	(9	)	(14,552		)
Tax effects resulting from the adoption of ASU No. 2018-02	(1,314		)	40	(10,434	)	(11,708	)	—		—	—		—
Total other comprehensive (loss) income	$	(17,160	)	505	(58,705	)	(75,360	)	(8,884	)	5	(57,031	)	$	(65,910	)

35

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

The following table reflects amounts reclassified from accumulated other comprehensive (loss) income to the consolidated statement of income and the affected line item in the statement where net income is presented for the three and six months ended March 31, 2018 and 2017:

	For the Three Months Ended
	March 31, 2018			March 31, 2017
Accumulated other Comprehensive (Loss) Income Components							Affected line items in the Consolidated Statements of Income
Reclassification adjustment for gains included in net income	$	116		$	—		Gains on securities transactions, net
Reclassification adjustment of actuarial net (loss) gain included in net income	(8		)	7			Compensation and employee benefits expense
Total before tax	108			7
Income tax benefit	(122		)	(2		)
Net of tax	$	(14	)	$	5

	For the Six Months Ended
	March 31, 2018			March 31, 2017
Accumulated other Comprehensive (Loss) Income Components							Affected line items in the Consolidated Statements of Income
Reclassification adjustment for gains included in net income	$	55		$	411		Gains on securities transactions, net
Reclassification adjustment of actuarial net (loss) gain included in net income	(18		)	15			Compensation and employee benefits expense
Total before tax	37			426
Income tax benefit	(214		)	(148		)
Net of tax	$	(177	)	$	278

10.     Derivatives and Hedging Activities

The Company offers currency forward contracts and interest rate swap contracts to certain commercial banking customers to manage their risk of exposure and risk management strategies. These contracts are simultaneously hedged by offsetting contracts with a third party, such that the Company would minimize its net risk exposure resulting from these transactions. In addition, the Company executes interest rate swaps with third parties to in order to hedge the interest expense of short-term Federal Home Loan Bank Advances. These contracts are simultaneously hedged with short-term Federal Home Loan Bank Advances.

Currency Forward Contracts. During the quarter ended March 31, 2018, the existing currency forward contacts were settled. At September 30, 2017, the Company had a currency forward contract in place with a commercial banking customer with a notional amount of $1.6 million. An offsetting currency forward contract with a third party was also in place at September 30, 2017. The currency forward contracts associated with this program do not meet hedge accounting requirements. Changes in the fair value of both the customer currency forward contract and the offsetting third party contract are recognized directly in earnings. Derivatives not designated in qualifying hedging relationships are not speculative and result from a service the Company provides to certain qualified commercial banking customers and are not used to manage interest rate risk in the Company's assets or liabilities.

Interest Rate Swaps. At March 31, 2018 and September 30, 2017, the Company did not have any interest rate swaps with commercial banking customers.

The Company had three interest rate swaps in place at March 31, 2018 with offsetting Federal Home Loan Bank advances with a notional amount of $30 million. At September 30, 2017, the Company had two interest rate swaps in place with offsetting Federal Home Loan Bank Advances with a notional amount of $20.0 million. The interest rate swaps associated with the program meet the hedge accounting requirements. The effective portion of changes in the fair value of the derivatives designated that qualify as cash flow hedges are recorded in accumulated other comprehensive income (loss). The ineffective portion of changes in the fair

36

COLUMBIA FINANCIAL, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements

value of the derivatives designated that qualify as cash flow hedges are recorded in earnings. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counter-party in exchange for the Company making fixed-rate payment payments over the life of the agreements without the exchange of the underlying notional amount.

For the three and six months ended March 31, 2018 and 2017, the Company did not record any hedge ineffectiveness associated with these contracts.

The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the Consolidated Balance Sheets at March 31, 2018 and September 30, 2017:

	March 31, 2018
	Asset Derivative			Liability Derivative
	Consolidated Balance Sheet	Fair value		Consolidated Balance Sheet	Fair Value
		(In thousands)			(In thousands)
Derivatives:
Interest rate swap - cash flow hedge	Other Assets	$	669	Other Liabilities	$	—
Total derivative instruments		$	669		$	—
	September 30, 2017
	Asset Derivative			Liability Derivative
	Consolidated Balance Sheet	Fair value		Consolidated Balance Sheet	Fair Value
		(In thousands)			(In thousands)
Derivatives:
Interest rate swap - cash flow hedge	Other Assets	95		Other Liabilities	$	—
Currency forward contract - non-designated hedge	Other Assets	182		Other Liabilities	182
Total derivative instruments		$	277		$	182

For the three and six months ended March 31, 2018 and 2017, no gains or losses were recorded in the consolidated statements of income.

The Company has agreements with counter-parties that contain a provision that if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default of its derivative obligations.

At March 31, 2018 and September 30, 2017, the fair value of derivatives was in a net asset position. At March 31, 2018 and September 30, 2017, accrued interest was $2 thousand and $9 thousand, respectively.

11.    Subsequent Events

The Company has evaluated events subsequent to March 31, 2018 and through the financial statement issuance date of May 14, 2018. On April 19, 2018, the Company completed its minority stock offering, after receiving all regulatory approvals with trading commencing on the Nasdaq Global Select Market on April 20, 2018. In connection with the closing, the Company issued 62,580,155 shares of its common stock to the MHC, the Company's mutual holding company, 3,476,675 shares to the Columbia Bank Foundation, the Bank's charitable foundation, and 49,832,345 shares to depositors of the Bank who subscribed for and were allocated shares in the minority stock offering, as well as the Columbia Bank Employee Stock Ownership Plan.

37

Columbia Financial, Inc.

Management’s Discussion and Analysis

Item 2.    MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Forward-Looking Statements

Certain statements contained herein are “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. Such forward-looking statements may be identified by reference to a future period or periods, or by the use of forward-looking terminology, such as “may,” “will,” “believe,” “expect,” “estimate,” "project," "intend," “anticipate,” “continue,” or similar terms or variations on those terms, or the negative of those terms. Forward-looking statements are subject to numerous risk factors and uncertainties, including, but not limited to, those set forth in the Company's prospectus filed with the Securities and Exchange Commission pursuant to Rule 424(b)(3) on February 20, 2018, and those related to the economic environment, particularly in the market areas in which the Company operates, competitive products and pricing, fiscal and monetary policies of the U.S. Government, changes in government regulations affecting financial institutions, including regulatory fees and capital requirements, changes in prevailing interest rates, acquisitions and the integration of acquired businesses, credit risk management, asset-liability management, the financial and securities markets and the availability of and costs associated with sources of liquidity.

The Company cautions readers not to place undue reliance on any such forward-looking statements which speak only as of the date made. The Company also advises readers that the factors listed above could affect the Company’s financial performance and could cause the Company’s actual results for future periods to differ materially from any opinions or statements expressed with respect to future periods in any current statements. The Company does not have any obligation to update any forward-looking statements to reflect any subsequent events or circumstances after the date of this statement.

Critical Accounting Policies

The Company considers certain accounting policies to be critically important to the fair presentation of its consolidated balance sheets and statements of income. These policies require management to make judgments on matters which by their nature have elements of uncertainty. The sensitivity of the Company’s consolidated financial statements to these critical accounting policies, and the assumptions and estimates applied, could have a significant impact on its consolidated balance sheets and statements of income. Assumptions, estimates and judgments made by management can be influenced by a number of factors, including the general economic environment. The Company has identified the following as critical accounting policies:

▪Adequacy of the allowance for loan losses

▪Valuation of securities and impairment analysis

▪Valuation of post-retirement benefits

▪Valuation of deferred tax assets

The calculation of the allowance for loan losses is a critical accounting policy of the Company. The allowance for loan losses is a valuation account that reflects management’s evaluation of the probable losses in the loan portfolio. Determining the amount of the allowance for loan losses involves a high degree of judgment. Estimates required to establish the allowance include: the overall economic environment, value of collateral, strength of guarantors, loss exposure in the event of default, the amount and timing of future cash flows on impaired loans, and determination of loss factors applied to the portfolio segments. These estimates are susceptible to significant change. Management regularly reviews loss experience within the portfolio, monitors current economic conditions and other factors related to the collectability of the loan portfolio. The Company maintains the allowance for loan losses through provisions for loan losses which are charged to income. Charge-offs against the allowance for loan losses are taken on loans where management determines that the collection of loan principal is unlikely. Recoveries made on loans that have been charged-off are credited to the allowance for loan losses.

As part of the evaluation of the adequacy of the allowance for loan losses, each quarter management prepares an analysis that categorizes the entire loan portfolio by certain risk characteristics such as loan type (residential mortgage, commercial mortgage, construction, commercial, etc.) and loan risk rating.

When assigning a risk rating to a loan, management utilizes an eight-point internal risk rating system. Loans deemed to be “acceptable quality” are rated 1 through 4, with a rating of 1 established for loans with minimal risk. Loans deemed to be of “questionable quality” are rated 5 (Special Mention) or 6 (Substandard). Loans with adverse classifications are rated 7 (Doubtful) or 8 (Loss). The risk ratings are also confirmed through periodic loan review examinations, which are currently performed by both an independent third-

38

party and the Company's internal loan review department. The Company requires an annual review be performed above certain dollar thresholds, depending on loan type, to help determine the appropriate risk rating.

Management estimates the amount of loan losses for groups of loans by applying quantitative loss factors to the loan segments at the risk rating level and applying qualitative adjustments to each loan segment at the risk rating level. Quantitative loss factors give consideration to historical loss experience and migration experience by loan type based upon an appropriate look-back period, adjusted for a loss emergence period. Quantitative loss factors are evaluated periodically. Qualitative adjustments give consideration to other qualitative or environmental factors such as trends and levels of delinquencies, impaired loans, charge-offs, recoveries and loan volumes, as well as national and local economic trends and conditions. Qualitative adjustments reflect risks in the loan portfolio not captured by the quantitative loss factors and, as such, are evaluated from a risk level perspective relative to the risk levels present over the look-back period. The reserves resulting from the application of both the quantitative experience and qualitative factors are combined to arrive at the allowance for loan losses.

Management believes the primary risks inherent in the portfolio are a general decline in the economy, a decline in real estate market values, rising unemployment, elevated unemployment, increasing vacancy rates, and increases in interest rates in the absence of economic improvement. Any one or a combination of these events may adversely affect a borrowers’ ability to repay their loan, resulting in increased delinquencies and loan losses. Accordingly, the Company has recorded loan losses at a level which is estimated to represent the current risk in its loan portfolio. Management considers it important to maintain the ratio of the allowance for loan losses to total loans at an acceptable level considering the current composition of the loan portfolio.

Although management believes that the Company has established and maintained the allowance for loan losses at appropriate levels, additional reserves may be necessary if future economic and other conditions differ substantially from the current operating environment. Management evaluates its estimates and assumptions on an ongoing basis and the estimates and assumptions are adjusted when facts and circumstances necessitate a re-valuation of the estimate. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. In addition, regulatory agencies periodically review the adequacy of the Company’s allowance for loan losses as an integral part of their examination process. Such agencies may require the Company to recognize additions to the allowance or additional write-downs based on their judgments about information available to them at the time of their examination. Although management uses the best information available, the level of the allowance for loan losses remains an estimate that is subject to significant judgment.

The Company’s available-for-sale securities portfolio is carried at fair value, with unrealized gains or losses, net of taxes, reported in accumulated other comprehensive income or loss. Fair values are based on third party market quotations. Securities which the Company has the intent and ability to hold to maturity are classified as held-to-maturity and carried at amortized cost. Management conducts a periodic review and evaluation of the securities portfolio to determine if any declines in the fair values of securities are other-than-temporary. In this evaluation, if such a decline were deemed other-than temporary, management would measure the total credit-related component of the unrealized loss, and recognize that portion of the loss as a charge to current period earnings. The remaining portion of the unrealized loss would be recognized as an adjustment to accumulated other comprehensive income (loss). The fair value of the securities portfolio is significantly affected by changes in interest rates. In general, as interest rates rise, the fair value of fixed-rate securities decreases and as interest rates decline, the fair value of fixed-rate securities increases. The Company determines if it has the intent to sell these securities or if it is more likely than not that the Company would be required to sell the securities before the anticipated recovery. If either exists, the entire decline in value is considered other-than-temporary and would be recognized as an expense in the current period.

The Company provides certain health care and life insurance benefits to eligible retired employees. The cost of retiree health care and other benefits during the employees' period of active service are accrued monthly. The accounting guidance requires the following: a) recognizing in the statement of financial position the over funded or underfunded status of a defined benefit post-retirement plan measured as the difference between the fair value of plan assets and the benefit obligations; b) measuring a plan's assets and its obligations that determine its funded status as of the end of the Company's fiscal year (with limited exceptions); and c) recognizing as a component of other comprehensive income (loss), net of tax, the actuarial gain and losses and the prior service costs and credits that arise during the period.

The determination of whether deferred tax assets will be realizable is predicated on the reversal of existing deferred tax liabilities, utilization against carry-back years and estimates of future taxable income. Such estimates are subject to management’s judgment. A valuation allowance is established when management is unable to conclude that it is more likely than not that it will realize deferred tax assets based on the nature and timing of these items. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income tax expense in the period enacted.

39

Executive Summary

We completed our minority stock offering on April 19, 2018, and received gross proceeds of $498.3 million from the offering and believe we are well positioned to execute our growth strategy. We experienced strong earnings results, solid core deposit growth, continued high asset quality and disciplined expense control during the quarter. We continue to enhance our products and services while maintaining focus on our customers across the many communities we serve.

Comparison of Financial Condition at March 31, 2018 and September 30, 2017

Total assets increased approximately $1.1 billion, or 20.9%, to $6.6 billion at March 31, 2018 from $5.4 billion at September 30, 2017. The increase in total assets was primarily attributable to the receipt of subscription funds relating to the minority stock offering.

Cash and cash equivalents increased $533.4 million between March 31, 2018 and September 30, 2017. This increase is primarily the result of the minority stock offering which was pending at March 31, 2018.

Securities available-for-sale increased $295.0 million to $852.2 million at March 31, 2018 from $557.2 million at September 30, 2017. Securities held-to-maturity increased $121.2 million between March 31, 2018 and September 30, 2017. The increase in both categories of securities was attributable to the pre-investment of the anticipated proceeds from the minority stock offering.

Total loans increased $174.5 million to $4.5 billion at March 31, 2018 from $4.4 billion at September 30, 2017. One-to-four family, multifamily and commercial and construction loans contributed $110.5 million, $66.8 million, and $23.3 million to the growth, respectively. Home equity loans and advances declined $31.9 million between March 31, 2018 and September 30, 2017.

Total liabilities increased $1.1 billion, or 23.0%, to $6.1 billion at March 31, 2018 from $5.0 billion at September 30, 2017. The increase is primarily attributable to an increase in total deposits of $1.3 billion partially offset by a decrease in borrowings of $143.6 million. The $1.3 billion increase in total deposits is primarily attributable to subscription funds relating to the minority stock offering. Other components of the deposit growth were increases in non-interest bearing transaction accounts of $67.3 million, interest bearing transaction accounts of $108.7 million, money market accounts of $85.2 million and certificates of deposits of $66.7 million. The decrease in borrowings of $143.6 million is primarily the result of repayments of short-term borrowings from the minority stock offering proceeds.

Total stockholders’ equity decreased $2.0 million, or 0.4%, to $473.9 million at March 31, 2018 from $475.9 million at September 30, 2017. The net decrease reflects net income earned for the six months ended March 31, 2018, offset by the increase in unrealized losses in the available-for-sale investment portfolio and the change in pension benefit obligations.

Comparison of the Results of Operations for the Three Months Ended March 31, 2018 and 2017

Net income increased $1.5 million to $11.8 million for the three months ended March 31, 2018, compared to $10.3 million for the three months ended March 31, 2017. The increase was primarily attributable to a $4.3 million increase in net interest income combined with a $1.2 million decrease in income tax expense offset by a $1.6 million increase in loan loss provisions, a $1.3 million decrease in non-interest income and a $1.1 million increase in non-interest expense for the comparable periods.

The Company’s net interest income was $39.1 million for the quarter ended March 31, 2018, an increase of $4.3 million, or 12.3% from $34.8 million for the quarter ended March 31, 2017. The increase in net interest income was attributable to a $6.4 million increase in interest and dividend income which was partially offset by a $2.1 million increase in interest expense.

The increase in interest and dividend income for the three month period was largely due to a $278.8 million increase in average loans, a $336.2 million increase in average investment securities and a $110.3 million increase in other interest earning assets. The increase in other interest earning assets was largely due to the increase in excess cash reserves related to the subscriptions for the minority stock offering.

The yield on average earning assets decreased two basis points due to the growth in excess cash reserves as a percentage of the earning asset mix. The yield on average loans increased five basis points while the yield on investment securities increased 16 basis points for the quarter ended March 31, 2018 as compared with the quarter ended March 31, 2017.

The $2.0 million increase in interest expense on deposits was largely the result of a $525.3 million increase in the average balance of interest bearing deposits combined with an 11 basis point increase in the cost of funds related to deposits. The $122.6 million increase in the average balance of borrowings was almost entirely offset by a 34 basis point decrease in the cost of average borrowings. The reduced cost of average borrowings resulted from the maturity of higher rate borrowings in conjunction with increases in short term borrowings at lower rates.

40

The Company's net interest margin for the quarter ended March 31, 2018 decreased six basis points to 2.80% when compared to 2.86% for the quarter ended March 31, 2017. The weighted average yield on interest-earning assets decreased two basis points to 3.71% for the quarter ended March 31, 2018 compared with 3.73% for the quarter ended March 31, 2017. The cost of average interest bearing liabilities increased three basis points to 1.09% for the quarter ended March 31, 2018 as compared to 1.06% for the quarter ended March 31, 2017.

The provision for loan losses was $2.0 million for the quarter ended March 31, 2018, an increase of $1.6 million from $375 thousand for the quarter ended March 31, 2017. The increase in provision expense was primarily attributable to loan growth and changes in certain qualitative risk factors.

Non-interest income was $4.5 million for the quarter ended March 31, 2018, a decrease of $1.3 million or 22.1% from $5.8 million for the quarter ended March 31, 2017. Income from bank-owned life insurance decreased $634 thousand as a result of gains recognized during the three months ended March 31, 2017 associated with life insurance proceeds that did not reoccur in the 2018 period. Title insurance fees decreased $193 thousand as a result of a decline in activity. The Company also recognized gains on the sale of other real estate owned totaling $209 thousand during the March 31, 2017 quarter that did not reoccur.

Non-interest expense was $26.0 million for the quarter ended March 31, 2018, an increase of $1.1 million, or 4.4%, from $24.9 million for the quarter ended March 31, 2017. Compensation and employee benefits increased $545 thousand primarily as a result of additional salary expense related to annual merit increases and an increase in the accrual for incentive compensation, partially offset by a decrease in retirement benefit costs. Occupancy expenses increased $285 thousand due primarily to higher maintenance costs and the addition of new branches. Advertising expenses were higher by $166 thousand related to increased advertising of Bank products.

Income tax expense was $3.8 million for the quarter ended March 31, 2018, a decrease of $1.2 million or 24.1%, from $5.0 million for the quarter ended March 31, 2017. The Company's effective tax rates were 24.4% and 32.7% for the three months ended March 31, 2018 and 2017 respectively. The decrease in the effective tax rate for the three months ended March 31, 2018 compared to March 31, 2017 is primarily attributed to the Tax Cuts and Jobs Act.

Comparison of the Results of Operations for the Six Months Ended March 31, 2018 and 2017

Net income decreased $4.8 million to $15.5 million for the six months ended March 31, 2018, compared to $20.3 million for the six months ended March 31, 2017. The decrease in net income is driven by a $5.0 million increase in loan loss provisions, a $2.9 million increase in income tax expense, a $2.6 million increase in non-interest expense and a $2.1 million decrease in non-interest income partially offset by a $7.8 million increase in net interest income for the comparable periods.

The Company’s net interest income was $76.0 million for the six months ended March 31, 2018, an increase of $7.8 million, or 11.4 % from $68.2 million for the six months ended March 31, 2017. The increase in net interest income was attributable to an $11.4 million increase in interest and dividend income which was partially offset by a $3.6 million increase in interest expense.

The increase in interest and dividend income for the six month period was largely due to a $290.3 million increase in average loans, a $224.7 million increase in average investment securities and a six basis point increase in yield on loans.

The yield on average earning assets increased three basis points due to higher yields on loans and investment securities. The yield on average loans increased six basis points while the yield on investment securities increased 19 basis points for the six months ended March 31, 2018 as compared with the six months ended March 31, 2017.

The $3.4 million increase in interest expense on deposits was largely the result of a $390.7 million increase in the average balance of interest bearing deposits combined with an 11 basis point increase in the cost of deposits. The $103.7 million increase in the average balance of borrowings was almost entirely offset by a 31 basis point decrease in the cost of average borrowings. The reduced cost of average borrowings resulted from the maturity of higher rate borrowings in conjunction with increases in short term borrowings at lower rates.

The Company's net interest margin for the six months ended March 31, 2018 decreased one basis point to 2.79% when compared to 2.80% for the six months ended March 31, 2017. The weighted average yield on interest-earning assets increased three basis points to 3.71% for the six months ended March 31, 2018 compared with 3.68% for the six months ended March 31, 2017. The cost of average interest bearing liabilities increased four basis points to 1.11% for the six months ended March 31, 2018 as compared to 1.07% for the six months ended March 31, 2017.

The provision for loan losses was $5.4 million for the six months ended March 31, 2018, an increase of $5.0 million from $375 thousand for the six months ended March 31, 2017. The increase in provision expense was primarily attributed to loan growth and changes in certain qualitative risk factors.

41

Non-interest income was $9.2 million for the six months ended March 31, 2018, a decrease of $2.1 million or 18.6% from $11.3 million for the six months ended March 31, 2017. The Company recognized gains on the sale of securities, loan receivables, and real estate owned totaling $1.1 million during the six months ended March 31, 2017. For the comparable period ending March, 31, 2018, only $55 thousand of gains on the sale of securities was recognized. Income from bank-owned life insurance decreased $632 thousand as a result of gains recognized during the six months ended March 31, 2017 associated with life insurance proceeds that did not reoccur. Title insurance fees decreased $512 thousand as a result of a decline in activity.

Non-interest expense was $51.5 million for the six months ended March 31, 2018, an increase of $2.6 million, or 5.3%, from $48.9 million for the six months ended March 31, 2017. Compensation and employee benefits increased $1.2 million primarily as a result of additional salary expense related to annual merit increases and an increase in the accrual for incentive compensation, partially offset by a decrease in retirement benefit costs. Advertising expenses were higher by $863 thousand related to the increased advertising of bank products. Occupancy expenses increased $449 thousand due primarily to higher maintenance costs and the addition of new branches.

Income tax expense was $12.8 million for the six months ended March 31, 2018, an increase of $2.9 million or 29.4%, from $9.9 million for the six months ended March 31, 2017. The Company's effective tax rates were 45.3% and 32.8% for the six months ended March 31, 2018 and 2017 respectively. The increase in the effective tax rate for the six months ended March 31, 2018 compared to March 31, 2017 is primarily attributed to the revaluation of our gross deferred tax assets and liabilities as a result of the change in the corporate tax rate.

Asset Quality:

The following table sets forth information regarding the Company’s non-performing assets as of March 31, 2018 and September 30, 2017:

	March 31, 2018		September 30, 2017
	(In Thousands)
Mortgage loans:
Residential	$	2,565	$	3,496
Multi-Family & commercial	118		1,510
Total mortgage loans	2,683		5,006
Commercial loans	407		1,038
Consumer loans	636		351
Total non-performing loans	3,726		6,395
Foreclosed assets	959		393
Total non-performing assets	$	4,685	$	6,788

The following table sets forth information regarding the Company's 60-89 day delinquent loans as of March 31, 2018 and September 30, 2017:

	March 31, 2018		September 30, 2017
	(In Thousands)
Mortgage loans:
Residential	$	1,706	$	932
Multi-Family & commercial	—		123
Total mortgage loans	1,706		1,055
Commercial loans	—		388
Consumer loans	328		187
Total 60-89 day delinquent loans	$	2,034	$	1,630

At March 31, 2018, the allowance for loan losses totaled $60.0 million, or 1.32% of total loans, compared with $54.6 million, or 1.26% of total loans at September 30, 2017. Total non-performing loans were $3.7 million, or 0.08% of total loans at March 31, 2018, compared to $6.4 million, or 0.15% of total loans at September 30, 2017.

42

At March 31, 2018 and September 30, 2017, the Company held $959 thousand and $393 thousand of foreclosed assets, respectively. During the six months ended March 31, 2018, there were two additions to foreclosed assets with a carrying value of $566 thousand.

Non-performing assets totaled $4.7 million, or 0.07% of total assets at March 31, 2018 compared to $6.8 million or 0.13% of total assets at September 30, 2017.

Item 3.     QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Net Interest Income:

Qualitative Analysis.Interest rate risk is the exposure of a Company's current and future earnings and capital arising from adverse movements in interest rates. The guidelines of the Company’s interest rate risk policy seek to limit the exposure to changes in interest rates that affect the underlying economic value of assets, liabilities, earnings and capital.

The Asset/Liability Committee meets regularly to review the impact of interest rate changes on net interest income, net interest margin, net income and the economic value of equity. The Asset/Liability Committee reviews a variety of strategies that project changes in asset or liability mix and the impact of those changes on projected net interest income and net income.

The Company’s strategy for liabilities has been to maintain a stable funding base by focusing on core deposit accounts. The Company’s ability to retain maturing time deposit accounts is the result of its strategy to remain competitively priced within its marketplace. The Company’s pricing strategy may vary depending upon current funding needs and the ability of the Company to fund operations through alternative sources.

Quantitative Analysis. Current and future sensitivity to changes in interest rates are measured through the use of balance sheet and income simulation models. The analysis captures changes in net interest income using flat rates as a base and rising and declining interest rate forecasts. Changes in net interest income and net income for the forecast period, generally twelve to twenty-four months, is measured and compared to policy limits for acceptable changes. The Company periodically reviews historical deposit re-pricing activity and makes modifications to certain assumptions used in its balance sheet and income simulation models regarding the interest rate sensitivity of deposits. These modifications are made to more closely reflect the most likely results under the various interest rate change scenarios. Since it is inherently difficult to predict the sensitivity of interest bearing deposits to changes in interest rates, the changes in net interest income due to changes in interest rates cannot be precisely predicted. There are a variety of reasons that may cause actual results to vary considerably from the predictions presented below which include, but are not limited to, the timing, magnitude, and frequency of changes in interest rates, interest rate spreads, prepayments, and actions taken in response to such changes.

Assumptions used in the simulation model include but are not limited to:

•Investment pricing from third parties;

•Loan pricing indications from third parties;

•Loan and depository spread assumptions based upon the Company's product offerings;

•Investment and borrowing spreads based upon third party indications; and

•Prepayment assumptions derived from the Company's actual results and third party surveys.

The following table sets forth the results of the estimated impact of interest rate changes on our estimated annual net interest income as of March 31, 2018:

	March 31,
	2018
Change in Interest Rates (Basis Points)	Change in Net Interest Income
-100	(5.9	)%
Base	-
+100	4.0	%
+200	7.7	%

43

Another measure of interest rate sensitivity is to model changes in economic value of equity ("EVE") through the use of immediate and sustained interest rate shocks. The following table illustrates the result of the economic value of equity model as of March 31, 2018:

	March 31, 2018
			Estimated Increase (Decrease) in EVE					EVE as a Percentage of Economic Value of Assets
Change in Interest Rates (Basis Points)	Estimated EVE		Amount			Percent		EVE Ratio		Change in Basis Points
-100	$	986,172	$	7,223		0.7	%	14.89	%	(32	)
Base	978,949		-			-		15.22	%	-
+100	917,031		(61,918		)	(6.3	)%	14.71	%	(51	)
+200	847,484		(131,465		)	(13.4	)%	14.02	%	(120	)

The preceding table indicates that as of March 31, 2018, in the event of an immediate and sustained 200 basis point increase in interest rates, the EVE is projected to decrease 13.4%, or $131.5 million. If rates were to decrease 100 basis points, the model forecasts a 0.7%, or $7.2 million increase in the EVE. The interest rate risk results at March 31, 2018 are materially impacted by the minority stock offering which was pending and resulted in higher cash and cash equivalents levels at that date. Certain shortcomings are inherent in the methodologies used in the above interest rate risk measurements. Modeling changes in net interest income requires the use of certain assumptions regarding prepayment and deposit repricing, which may or may not reflect the manner in which actual yields and costs respond to changes in market interest rates. While management believes such assumptions are reasonable, there can be no assurance that assumed prepayment rates and repricing rates will approximate actual future loan prepayment and deposit repricing activity. Moreover, net interest income assumes that the composition of interest sensitive assets and liabilities existing at the beginning of a period remains constant over the period being measured and also assumes that a particular change in interest rates is reflected uniformly across the yield curve regardless of the duration to maturity or repricing of specific assets and liabilities. Accordingly, although the table provides an indication of the Company’s interest rate risk exposure at a particular point in time, such measurement is not intended to and does not provide a precise forecast of the effect of changes in market interest rates on the Company’s net interest income and will differ from actual.

Liquidity Management and Capital Resources:

Liquidity Management. Liquidity is the ability to meet current and future financial obligations of a short-term and long-term nature. Our primary source of funds consists of deposit inflows, loan repayments and maturities, sales of securities and borrowings. While maturities and scheduled amortization of loans and securities are predictable sources of funds, deposit flows, calls of investment securities and borrowed funds and prepayments of loans are influenced by economic conditions, competition and interest rate movements.

The Company's cash flows are classified as cash flows from operating activities, investing activities and financing activities. Refer to the Consolidated Statements of Cash Flows for further details of the cash inflows and outflows of the Company.

Capital Resources. The Company is subject to regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company's consolidated statements of financial condition. Federal regulators require federally insured depository institutions to meet several minimum capital standards: 1) total capital to risk-weighted assets of 8.0%; 2) tier 1 capital to risk-weighted assets of 6.0%; 3) common equity tier 1 capital to risk-weighted assets of 4.5%; and 4) tier 1 capital to adjusted total assets of 4.0%. In addition to establishing the minimum regulatory capital requirements, the regulations limit capital distributions and certain discretionary bonus payments to management if the institution does not hold a “capital conservation buffer” consisting of 2.5% of common equity tier 1 capital to risk-weighted assets above the amount necessary to meet its minimum risk-based capital requirements. The capital conservation buffer requirement was phased in beginning January 1, 2016, at 0.625% of risk-weighted assets and increases each year until fully implemented at 2.5% on January 1, 2019.

The regulations establish a framework for the classification of savings institutions into five categories: well capitalized, adequately capitalized, undercapitalized, significantly undercapitalized, and critically undercapitalized. Generally, an institution is considered well capitalized if it has: a total capital to risk-weighted assets ratio of at least 10%, a tier 1 capital to risk-weighted assets ratio of at least 8%, a common tier 1 capital to risk-weighted assets ratio of at least 6.5%, and a tier 1 capital to adjusted total assets ratio of at least 5.0%. As of March 31, 2018 the Company exceeded all capital adequacy requirements to which it is subject.

44

The following table presents the Company's actual capital amounts and ratios as of March 31, 2018 compared to the Federal Reserve Bank minimum capital adequacy requirements and the Federal Reserve Bank requirements for classification as a well - capitalized institution:

	March 31, 2018
	Actual				For capital adequacy purposes				To be well capitalized under prompt corrective action provisions
	Amount		Ratio		Amount		Ratio		Amount		Ratio
	(in Thousands)
Company:
Total capital to risk-weighted assets	$	645,533	15.24	%	$	338,864	8.0	%	$	423,580	10.0	%
Tier 1 capital to risk-weighted assets	592,307		13.98		254,148		6.0		338,864		8.0
Common equity tier 1 capital to risk-weighted assets	540,760		12.77		190,611		4.5		275,327		6.5
Tier 1 capital to adjusted total assets	592,307		10.00		237,041		4.0		296,302		5.0
	September 30, 2017
	Actual				For capital adequacy purposes				To be well capitalized under prompt corrective action provisions
	Amount		Ratio		Amount		Ratio		Amount		Ratio
	(in Thousands)
Company:
Total capital to risk-weighted assets	$	616,052	15.11	%	$	326,254	8.0	%	$	407,817	10.0	%
Tier 1 capital to risk-weighted assets	564,854		13.85		244,690		6.0		326,254		8.0
Common equity tier 1 capital to risk-weighted assets	513,854		12.60		183,518		4.5		265,081		6.5
Tier 1 capital to adjusted total assets	564,854		10.59		213,298		4.0		266,023		5.0
	March 31, 2018
	Actual				For capital adequacy purposes				To be well capitalized under prompt corrective action provisions
	Amount		Ratio		Amount		Ratio		Amount		Ratio
	(in Thousands)
Columbia Bank:
Total capital to risk-weighted assets	$	639,590	15.11	%	$	338,582	8.0	%	$	423,228	10.0	%
Tier 1 capital to risk-weighted assets	586,408		13.86	%	253,937		6.0		338,582		8.0
Common equity tier 1 capital to risk-weighted assets	586,408		13.86	%	190,453		4.5		275,098		6.5
Tier 1 capital to adjusted total assets	586,408		9.87	%	237,655		4.0		297,068		5.0

45

	September 30, 2017
	Actual				For capital adequacy purposes				To be well capitalized under prompt corrective action provisions
	Amount		Ratio		Amount		Ratio		Amount		Ratio
	(in Thousands)
Columbia Bank:
Total capital to risk-weighted assets	$	608,971	14.95	%	$	325,980	8.0	%	$	407,475	10.0	%
Tier 1 capital to risk-weighted assets	557,815		13.69		244,485		6.0		325,980		8.0
Common equity tier 1 capital to risk-weighted assets	557,815		13.69		183,364		4.5		264,859		6.5
Tier 1 capital to adjusted total assets	557,815		10.47		213,160		4.0		266,450		5.0

Item 4.     CONTROLS AND PROCEDURES

An evaluation was performed under the supervision and with the participation of the Company’s management, including the Chief Executive Officer and the Chief Financial Officer, of the effectiveness of the design and operation of the Company’s disclosure controls and procedures (as defined in Rule 13a-15(e) promulgated under the Securities and Exchange Act of 1934, as amended) as of March 31, 2018. In designing and evaluating the Company’s disclosure controls and procedures, the Company and its management recognize that any controls and procedures, no matter how well-designed and operated, can provide only reasonable assurance of achieving the desired control objectives, and management necessarily was required to apply its judgment in evaluating and implementing possible controls and procedures. Based on that evaluation, the Company’s management, including the Chief Executive Officer and the Chief Financial Officer, concluded that the Company’s disclosure controls and procedures were effective to ensure that information required to be disclosed in the reports filed or submitted under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms.

During the quarter ended March 31, 2018, there were no changes in the Company’s internal controls over financial reporting that have materially affected, or are reasonably likely to materially affect, the Company’s internal controls over financial reporting.

46

PART II – OTHER INFORMATION

Item 1.     Legal Proceedings

The Company is involved in various legal actions and claims arising in the normal course of business. In the opinion of management, these legal actions and claims are not expected to have a material adverse impact on the Company’s financial condition.

Item 1A.     Risk Factors

For information regarding the Company’s risk factors, refer to the “Risk Factors” in the Company’s prospectus, filed with the Securities and Exchange Commission pursuant to Rule 424(b)(3) on February 20, 2018. As of March 31, 2018 the risk factors of the Company have not changed materially from those disclosed in the prospectus.     

Item 2.     Unregistered Sales of Equity Securities

None.

Item 3.     Defaults Upon Senior Securities

None.

Item 4.     Mine Safety Disclosures

Not Applicable.

Item 5.     Other Information

None.

Item 6.     Exhibits

The exhibits listed in the Exhibit Index (following the signatures section of this report) are included in, or incorporated by reference into, this Quarterly Report on Form 10-Q.

47

Exhibit Index

3.1	Certificate of Incorporation of Columbia Financial, Inc.
3.2	Amended and Restated Bylaws of Columbia Financial, Inc.
4	Form of Common Stock Certificate of Columbia Financial, Inc.
31.1	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32	Certification of Chief Executive Officer and Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.	The following materials from the Company’s Quarterly Report to Stockholders on Form 10-Q for the quarter ended. March 31, 2018, formatted in XBRL (Extensible Business Reporting Language): (i) the Consolidated Financial Condition, (ii) the Consolidated Statements of Income, (iii) the Consolidated Statements of Comprehensive Income, (iv) the Consolidated Statements of Changes in Stockholder’s Equity, (v) the Consolidated Statements of Cash Flows and (vi) the Notes to Consolidated Financial Statements.
101.	INS XBRL Instance Document
101.	SCH XBRL Taxonomy Extension Schema Document
101.	CAL XBRL Taxonomy Extension Calculation Linkbase Document
101.	DEF XBRL Taxonomy Extension Definition Linkbase Document
101.	LAB XBRL Taxonomy Extension Labels Linkbase Document
101.	PRE XBRL Taxonomy Extension Presentation Linkbase Document

48

SIGNATURES

		Columbia Financial, Inc
Date:	May 14, 2018	/s/Thomas J. Kemly
		Thomas J. Kemly
		President and Chief Executive Officer
		(Principal Executive Officer)
Date:	May 14, 2018	/s/Dennis E. Gibney
		Dennis E. Gibney
		Executive Vice President and Chief Financial Officer
		(Principal Financial and Accounting Officer)

49

EX-31.1

Section 2: EX-31.1 (EXHIBIT 31.1)

Certification of Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Thomas J. Kemly, certify that:

1. I have reviewed this report on Form 10-Q of Columbia Financial, Inc.

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors:

a. all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	May 14, 2018	/s/Thomas J. Kemly
		Thomas J. Kemly
		President and Chief Executive Officer

EX-31.2

Section 3: EX-31.2 (EXHIBIT 31.2)

Certification Pursuant to

Exchange Act Rule 13a-14(a) and Rule 15d-14(a)

Certification of Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Dennis E. Gibney, certify that:

1. I have reviewed this report on Form 10-Q of Columbia Financial, Inc.

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

The registrant’s other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors:

a. all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	May 14, 2018	/s/Dennis E. Gibney
		Dennis E. Gibney
		Executive Vice President and Chief Financial Officer

EX-32

Section 4: EX-32 (Exhibit 32)

Certification pursuant to 18 U.S.C. Section 1350,

as adopted pursuant to Section 906

of the Sarbanes-Oxley Act of 2002

Thomas J. Kemly, President and Chief Executive Officer, and Dennis E. Gibney, Executive Vice President and Chief Financial Officer of Columbia Financial Inc. (the “Company”), each certify in his capacity as an officer of the Company that he has reviewed the quarterly report of the Company on Form 10-Q for the quarter ended March 31, 2018 and that to the best of his knowledge:

(1) the report fully complies with the requirements of Sections 13(a) of the Securities Exchange Act of 1934; and

(2) the information contained in the report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	May 14, 2018	/s/Thomas J. Kemly
		Thomas J. Kemly
		President and Chief Executive Officer
Date:	May 14, 2018	/s/Dennis E. Gibney
		Dennis E. Gibney
		Executive Vice President and Chief Financial Officer

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Document and Entity Information	6 Months Ended
	Mar. 31, 2018 shares
Document and Entity Information [Abstract]
Entity Registrant Name	Columbia Financial, Inc.
Entity Central Index Key	0001723596
Current Fiscal Year End Date	--09-30
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period	Q2
Trading Symbol	CLBK
Amendment Flag	false
Entity Common Stock, Shares Outstanding	10

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Assets
Cash and cash equivalents	$ 634,321	$ 100,914
Short-term investments	60	61
Total cash and cash equivalents	634,381	100,975
Securities available-for-sale, at fair value	852,213	557,176
Securities held-to-maturity, at amortized cost (fair value of $245,477 and $131,822 at March 31, 2018 and September 30, 2017, respectively)	254,131	132,939
Federal Home Loan Bank stock	29,381	35,844
Loans receivable, net	4,479,919	4,307,623
Accrued interest receivable	16,614	14,687
Real estate owned	959	393
Office properties and equipment, net	43,706	40,835
Bank-owned life insurance	151,585	149,432
Goodwill and intangible assets	5,976	6,019
Other assets	96,016	83,405
Total assets	6,564,881	5,429,328
Liabilities:
Deposits	5,395,253	4,123,428
Borrowings	589,430	733,043
Advance payments by borrowers for taxes and insurance	28,522	27,118
Accrued expenses and other liabilities	77,772	69,825
Total liabilities	6,090,977	4,953,414
Stockholder's equity:
Retained earnings	549,264	522,094
Accumulated other comprehensive loss, net of tax	(75,360)	(46,180)
Total stockholder's equity	473,904	475,914
Total liabilities and stockholder's equity	$ 6,564,881	$ 5,429,328

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Statement of Financial Position [Abstract]
Securities held-to-maturity	$ 245,477	$ 131,822

XML

Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Interest and dividend income:
Loans receivable	$ 43,841	$ 40,602	$ 86,884	$ 79,976
Securities available-for-sale	6,415	4,338	11,488	8,646
Securities held-to-maturity	464	0	845	0
Federal funds and interest earning deposits	488	23	591	57
Federal Home Loan Bank stock dividends	586	466	1,154	878
Total interest and dividend income	51,794	45,429	100,962	89,557
Interest expense:
Deposits	8,099	6,072	15,731	12,288
Borrowings	4,633	4,579	9,242	9,086
Total interest expense	12,732	10,651	24,973	21,374
Net interest income	39,062	34,778	75,989	68,183
Provision for loan losses	2,000	375	5,400	375
Net interest income after provision for loan losses	37,062	34,403	70,589	67,808
Non-interest income:
Demand deposit account fees	944	914	1,904	1,765
Bank-owned life insurance	1,064	1,698	2,153	2,785
Title insurance fees	774	967	1,792	2,304
Loan fees and service charges	453	495	995	947
(Loss) gain on securities transactions, net	116	0	55	411
Gain on sale of loans receivable, net	0	102	0	510
Gain on sale of real estate owned	0	209	0	197
Other non-interest income	1,134	1,373	2,261	2,333
Total non-interest income	4,485	5,758	9,160	11,252
Non-interest expense:
Compensation and employee benefits expense	16,525	15,980	32,146	30,989
Occupancy expense	3,716	3,431	7,102	6,653
Federal insurance premiums expense	428	413	843	825
Advertising expense	847	681	2,255	1,392
Professional fees expense	214	180	611	399
Data processing expense	642	568	1,237	1,098
Other non-interest expense	3,586	3,602	7,306	7,538
Total non-interest expense	25,958	24,855	51,500	48,894
Income before income tax expense	15,589	15,306	28,249	30,166
Income tax expense	3,805	5,012	12,787	9,880
Net income	$ 11,784	$ 10,294	$ 15,462	$ 20,286

XML

Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 11,784	$ 10,294	$ 15,462	$ 20,286
Other comprehensive (loss) income, net of tax:
Unrealized loss on securities available-for-sale	(9,985)	394	(13,130)	(14,815)
Accretion of unrealized gain on securities reclassified as held-to-maturity	19	0	17	0
Reclassification adjustment for gains included in net income	88	0	28	267
Total other comprehensive (loss) income, net of tax	(9,878)	394	(13,085)	(14,548)
Derivatives, net of tax
Unrealized gain on swap contracts	342	6	505	5
Total derivatives, net of tax	342	6	505	5
Employee benefit plans, net of tax:
Amortization of prior service cost included in net income	(43)	(18)	(85)	(37)
Reclassification adjustment of actuarial net loss included in net income	(102)	5	(205)	11
Change in funded status of retirement obligations	(268)	(135)	(5,876)	17
Tax effects resulting from the adoption of ASU No. 2018-02	0	0	(10,434)	0
Total employee benefit plans, net of tax	(413)	(148)	(16,600)	(9)
Total other comprehensive (loss) income	(9,949)	252	(29,180)	(14,552)
Total comprehensive income (loss), net of tax	$ 1,835	$ 10,546	$ (13,718)	$ 5,734

XML

Consolidated Statements of Changes in Stockholder's Equity (Unaudited) - USD ($) $ in Thousands	Total	Retained Earnings	Accumulated other comprehensive loss, net of tax
Balance at beginning of year at Sep. 30, 2016	$ 439,664	$ 491,022	$ (51,358)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	20,286	20,286	0
Other comprehensive loss	(14,552)	0	(14,552)
Balance at end of year at Mar. 31, 2017	445,398	511,308	(65,910)
Balance at beginning of year at Dec. 31, 2016			(66,162)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	10,294
Other comprehensive loss	252
Balance at end of year at Mar. 31, 2017	445,398	511,308	(65,910)
Balance at beginning of year at Sep. 30, 2017	475,914	522,094	(46,180)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	15,462	15,462	0
Other comprehensive loss	(29,180)
Other comprehensive income (loss) including impact of tax act	(17,472)	0	(17,472)
Balance at end of year at Mar. 31, 2018	473,904	549,264	(75,360)
Balance at beginning of year at Dec. 31, 2017			(65,411)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	11,784
Other comprehensive loss	(9,949)
Balance at end of year at Mar. 31, 2018	473,904	549,264	(75,360)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reclassification of tax effects resulting from the adoption of ASU No. 2018-02 | Accounting Standards Update 2018-02	$ 0	$ 11,708	$ (11,708)

XML

Consolidated Statements Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 15,462	$ 20,286
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of deferred loan origination fees and costs	831	408
Net amortization of premiums and discounts on securities	608	283
Amortization on mortgage servicing rights	43	57
Amortization of debt issuance costs	27	27
Depreciation and amortization of office properties and equipment	1,764	1,684
Provision for loan losses	5,400	375
Gain on securities transactions, net	(55)	(411)
Gain on real estate owned, net	0	(197)
Deferred tax (benefit) expense	(2,679)	7,994
Increase in accrued interest receivable	(1,927)	(863)
Increase in cash surrender value of bank-owned life insurance	2,153	2,132
Increase in other assets	(12,611)	(12,935)
Increase (decrease) in accrued expenses and other liabilities	7,947	(438)
Net cash provided by operating activities	12,657	14,138
Cash flows from investing activities:
Proceeds from sales of securities available-for-sale	9,752	57,350
Proceeds from principal pay downs / maturities on securities available-for-sale	18,414	33,494
Proceeds from principal pay downs / maturities on securities held-to-maturity	3,795	0
Purchases of securities available-for-sale	(338,390)	(14,005)
Purchases of securities held-to-maturity	(125,146)	0
Purchases of loan receivables	(60,810)	(16,772)
Loan originations, net of principal payments	(118,283)	(257,039)
Proceeds from bank-owned life insurance	0	977
Proceeds from sales of Federal Home Loan Bank stock	34,241	21,240
Purchases of Federal Home Loan Bank stock	(27,778)	(24,111)
Additions to office properties and equipment	(4,635)	(2,649)
Proceeds from sales of real estate owned	0	1,409
Net cash used in investing activities	(608,840)	(200,106)
Cash flows from financing activities:
Net increase in deposits	1,271,825	135,544
Proceeds from long-term borrowings	26,360	342,700
Payments for maturities, calls, and payoffs on borrowings	(1,551,600)	(298,900)
Increase in short-term borrowings	1,381,600	10,000
Increase (decrease) in advance payments by borrowers for taxes and insurance	1,404	(3,108)
Net cash provided by financing activities	1,129,589	186,236
Net increase in cash and cash equivalents	533,406	268
Cash and cash equivalents at beginning of year	100,975	45,695
Cash and cash equivalents at end of year	634,381	45,963
Cash paid during the period for:
Interest	26,141	21,530
Income tax payments, net	7,278	9,791
Noncash investing and financing activities:
Transfer of loans receivable to real estate owned	$ 566	$ 145

XML

Basis of Financial Statement Presentation

6 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Financial Statement Presentation

Basis of Financial Statement Presentation

The accompanying unaudited consolidated financial statements include the accounts of Columbia Financial, Inc., its wholly-owned subsidiary Columbia Bank (the "Bank") and the Bank's wholly-owned subsidiaries (collectively, the “Company”). In consolidation, all significant inter-company accounts and transactions are eliminated.

Columbia Financial, Inc. is a majority-owned subsidiary of Columbia Bank, MHC ("MHC"). The accounts of MHC are not consolidated in the accompanying consolidated financial statements of the Company.

The Company owns 100% of the common stock of a Delaware statutory basis trust, Columbia Capital Trust I (the "Trust"). The trust is classified as a variable interest entity and is not consolidated as it does not satisfy the conditions for consolidation.

In preparing the interim unaudited consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the consolidated balance sheets and consolidated statements of income for the periods presented. Material estimates that are particularly susceptible to change are: the allowance for loan losses, the valuation of securities, the valuation of post-retirement benefits and the valuation of deferred tax assets. Estimates and assumptions are reviewed periodically and the effects of revisions are reflected in the consolidated financial statements in the period they are deemed necessary. While management uses its best judgment, actual amounts or results could differ significantly from those estimates.

The interim unaudited consolidated financial statements of the Company presented herein have been prepared in accordance with the rules of the Securities and Exchange Commission (“SEC”) for quarterly reports on Form 10-Q and U.S. generally accepted accounting principles in the United States of America (“GAAP”). Certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to the rules and regulations of the SEC.

In the opinion of management, all adjustments and disclosures considered necessary for the fair presentation of the accompanying unaudited consolidated financial statements have been included. Interim results are not necessarily reflective of the results of the entire year. The accompanying unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements for the year ended September 30, 2017 and notes thereto, which are included in the Company’s Registration Statement on Form S-1.

XML

Plan of Stock Issuance

6 Months Ended

Mar. 31, 2018

Equity [Abstract]

Plan of Stock Issuance

Plan of Stock Issuance

    On September 27, 2017, the Board of Directors of the Company adopted a plan of stock issuance (the “Plan”), as amended on January 25, 2018 pursuant to which the Company will sell shares of common stock, representing a minority ownership (approximately 43.0% of outstanding shares of common stock) interest in the Company. Shares will be offered to eligible depositors and borrowers and the tax qualified employee benefit plans of the Company in a subscription offering and, if necessary, to the general public in a community and/or syndicated community offering or firm commitment public offering. Columbia Bank, MHC, Columbia Financial Inc.'s holding company, will own 54.0% of the outstanding common stock following the offering. In connection with the Plan, subject to the approval of the MHC's members, the Company plans to contribute 3.0% of its then outstanding shares of common stock following the offering to the Columbia Bank Foundation.

Subsequent to the completion of the offering, the Board of Directors of the Company will have the authority to declare dividends on shares of common stock, subject to statutory and regulatory requirements and other considerations.

The direct costs of the Company’s stock offering will be deferred and deducted from the proceeds of the offering. At March 31, 2018, total deferred costs were $1.7 million. On April 19, 2018, the Company announced the completion of the offering. In connection with the closing, the Company issued 62,580,155 shares of its common stock to the MHC, the Company's mutual holding company, 3,476,675 shares to the Columbia Bank Foundation, the Bank's charitable foundation, and 49,832,345 shares to depositors of the Bank who subscribed for and were allocated shares in the minority stock offering, as well as the Columbia Bank Employee Stock Ownership Plan. On April 20, 2018, the Company's common stock began trading on the Nasdaq Global Select Market under the ticker symbol "CLBK".

XML

Recent Accounting Pronouncements

6 Months Ended

Mar. 31, 2018

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Recent Accounting Pronouncements

Recent Accounting Pronouncements

In February 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update ("ASU") No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220). The updated guidance allows a reclassification from accumulated other comprehensive income to retained earnings for the stranded tax effects resulting from the Tax Cuts and Jobs Act disclosed in Note 9. The purpose of the guidance is to improve the usefulness of the information reported to the financial statement users. The guidance is effective for all entities for fiscal years beginning after December 31, 2018 and interim periods within those fiscal years. Early adoption is permitted. The Company early adopted ASU No. 2018-02 for the period ended December 31, 2017 and the impact of the adoption resulted in a reclassification adjustment between accumulated other comprehensive income and retained earnings of $11.7 million.

As an “emerging growth company” as defined in Title 1 of the Jumpstart Our Business Startups (JOBS) Act, the Company has elected to use the extended transition period to delay the adoption of new or reissued accounting pronouncements applicable to public companies until such pronouncements are made applicable to private companies. As of March 31, 2018, there are no significant differences in the guidance comparability of the financial statements as a result of this extended transition period.

In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities (ASU 2017-12). The purpose of this updated guidance is to better align a company’s financial reporting for hedging activities with the economic objectives of those activities. The effective date for this guidance is fiscal years beginning after December 15, 2018, with early adoption, including adoption in an interim period, permitted. ASU 2017-12 requires a modified retrospective transition method in which the Company will recognize the cumulative effect of the change on the opening balance of each affected component of equity in the statement of financial position as of the date of adoption. The Company is currently evaluating the impact of the new guidance on the Company’s consolidated financial statements.

In March 2017, the FASB issued ASU No. 2017-08, “Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities.” This guidance shortens the amortization period for premiums on callable debt securities by requiring that premiums be amortized to the first (or earliest) call date instead of as an adjustment to the yield over the contractual life. This change more closely aligns the accounting with the economics of a callable debt security and the amortization period with expectations that already are included in market pricing on callable debt securities. This guidance does not change the accounting for discounts on callable debt securities, which will continue to be amortized to the maturity date. This guidance includes only instruments that are held at a premium and have explicit call features. It does not include instruments that contain prepayment features, such as mortgage backed securities; nor does it include call options that are contingent upon future events or in which the timing or amount to be paid is not fixed. The effective date for this guidance is fiscal years beginning after December 15, 2018, including interim periods within the reporting period, with early adoption permitted. Transition is on a modified retrospective basis with an adjustment to retained earnings as of the beginning of the period of adoption. If early adopted in an interim period, adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. The Company is currently evaluating the impact of the new guidance on the Company’s consolidated financial statements.

In March 2017, the FASB issued ASU No. 2017-07, "Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Post-retirement Benefit Cost", which requires that companies disaggregate the service cost component from other components of net benefit cost. This update calls for companies that offer post-retirement benefits to present the service cost, which is the amount an employer has to set aside each quarter or fiscal year to cover the benefits, in the same line item with other current employee compensation costs. Other components of net benefit cost will be presented in the income statement separately from service costs component and outside the subtotal of income from operations, if one is presented. This guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company is currently evaluating the impact of the new guidance on the Company’s consolidated financial statements and does not anticipate the new guidance to have a material impact.

In January 2017, the FASB issued ASU No. 2017-04, “Simplifying the Test for Goodwill Impairment.” The main objective of this guidance is to simplify the accounting for goodwill impairment by requiring that impairment charges be based upon the first step in the current two-step impairment test under Accounting Standards Codification (ASC) 350. Currently, if the fair value of a reporting unit is lower than its carrying amount (Step 1), an entity calculates any impairment charge by comparing the implied fair value of goodwill with its carrying amount (Step 2). The implied fair value of goodwill is calculated by deducting the fair value of all assets and liabilities of the reporting unit from the reporting unit’s fair value as determined in Step 1. To determine the implied fair value of goodwill, entities estimate the fair value of any unrecognized intangible assets and any corporate-level assets or liabilities that were included in the determination of the carrying amount and fair value of the reporting unit in Step 1. Under this guidance, if a reporting unit’s carrying amount exceeds its fair value, an entity will record an impairment charge based on that difference. The impairment charge will be limited to the amount of goodwill allocated to that reporting unit. This guidance eliminates the requirement to calculate a goodwill impairment charge using Step 2. This guidance does not change the guidance on completing Step 1 of the goodwill impairment test. Under this guidance, an entity will still be able to perform the current optional qualitative goodwill impairment assessment before determining whether to proceed to Step 1. The guidance will be applied prospectively and is effective for annual and interim impairment tests performed in periods beginning after December 15, 2019. Early adoption is permitted for annual and interim goodwill impairment testing dates after January 1, 2017. The Company is currently evaluating the impact of the new guidance on the Company’s consolidated financial statements.

In August 2016, the FASB issued ASU No. 2016-15, "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments," a new standard which addresses diversity in practice related to eight specific cash flow issues: debt prepayment or extinguishment costs, settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance policies (including bank-owned life insurance policies), distributions received from equity method investees, beneficial interests in securitization transactions and separately identifiable cash flows and application of the predominance principle. This guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Entities will apply the standard’s provisions using a retrospective transition method to each period presented. If it is impracticable to apply the amendments retrospectively for some of the issues, the amendments for those issues would be applied prospectively as of the earliest date practicable. The Company is currently evaluating the impact of the new guidance on the Company’s consolidated financial statements and does not anticipate the new guidance to have a material impact.

In June 2016, the FASB issued ASU No. 2016-13, “Measurement of Credit Losses on Financial Instruments”. This guidance provides financial statement users with more decision-useful information about expected credit losses on financial instruments by a reporting entity at each reporting date. The amendments of this guidance require financial assets measured at amortized cost to be presented at the net amount expected to be collected. The allowance for credit losses would represent a valuation account that would be deducted from the amortized cost basis of the financial asset(s) to present the net carrying value at the amount expected to be collected on the financial asset. The income statement would reflect the measurement of credit losses that have taken place during the period. The measurement of expected credit losses would be based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. An entity would be required to use judgment in determining the relevant information and estimation methods that are appropriate in its circumstances. The guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within that reporting period, early adoption is permitted. The Company is currently evaluating its existing systems and data to support the new standard as well as assessing the impact that the guidance will have on the Company's consolidated financial statements. The Company has formed a working group under the direction of the Chief Accounting Officer that is primarily comprised of individuals from finance, credit, risk management, and operations. The Company has been developing an implementation plan as well as considering the use of consultants to aid in the implementation.

In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842)”. This guidance requires all lessees to recognize a lease liability and a right-of-use asset, measured at the present value of future minimum lease payments, at the lease commencement date. Lessor accounting remains largely unchanged under the new guidance. The guidance is effective for fiscal years beginning after December 15, 2018, including interim reporting periods within that reporting period, early adoption is permitted. A modified retrospective approach must be applied for leases existing at, or entered into after, the beginning of the earliest comparative period present in the financial statements. The Company is currently evaluating the impact of the new guidance on its consolidated financial statements by reviewing its existing lease contracts and service contracts.

In January 2016, the FASB issued ASU No. 2016-01, “Recognition and Measurement of Financial Assets and Financial Liabilities”. This guidance requires an entity to: i) measure equity investments at fair value through net income, with certain exceptions; (ii) present in other comprehensive income the changes in instrument-specific credit risk for financial liabilities measured using the fair value option; (iii) present financial assets and financial liabilities by measurement category and form of financial asset; (iv) calculate the fair value of financial instruments for disclosure purposes based on an exit price and; (v) assess a valuation allowance on deferred tax assets related to unrealized losses on available-for-sale debt securities in combination with other deferred tax assets. This guidance provides an election to subsequently measure certain nonmarketable equity investments at cost less any impairment and adjusted for certain observable price changes. The guidance also requires a qualitative impairment assessment of such equity investments and amends certain fair value disclosure requirements. The guidance is effective for annual periods beginning after December 15, 2017. The Company is currently evaluating the impact of the new guidance on the Company’s consolidated financial statements by evaluating its revenue streams and contracts potentially affected by the guidance.

In May 2014, the FASB issued ASU No. 2014-09, "Revenue from Contracts with Customers." The objective of this amendment is to clarify the principles for recognizing revenue and to develop a common revenue standard for U.S. GAAP and IFRS. This update affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are in the scope of other standards. The guidance is effective for public business entities for financial statements issued for fiscal years beginning after December 15, 2017, and early adoption is permitted. Subsequently, the FASB issued the following standards related to ASU No. 2014-09: ASU No. 2016-08, “Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations;” ASU No. 2016-10, “Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing;” ASU No. 2016-11, “Revenue Recognition (Topic 605) and Derivatives and Hedging (Topic 815): Rescission of SEC Guidance Because of ASU No. 2014-09 and 2014-16 Pursuant to Staff Announcements at the March 3, 2016 EITF Meeting;” and ASU No. 2016-12, “Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients”. These amendments are intended to improve and clarify the implementation guidance of ASU No. 2014-09 and have the same effective date as the original guidance. The Company's revenue is primarily comprised of net interest income on interest earning assets and liabilities and non-interest income. The scope of guidance explicitly excludes net interest income as well as other revenues associated with financial assets and liabilities, including loans, leases, securities and derivatives. The Company is currently evaluating the impact of the new guidance on the Company’s consolidated financial statements and does not anticipate the new guidance to have a material impact.

In March 2017, the FASB issued ASU No. 2017-08, Receivables-Nonrefundable Fees and Other Costs (Subtopic 310- 20): Premium Amortization on Purchased Callable Debt Securities. The amendments require the premium to be amortized to the earliest call date. The Company adopted ASU No. 2017-08 beginning October 1, 2017 and the impact was immaterial to the Company's financial statements.

XML

Investment Securities

6 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Investments Securities

Investment Securities

Securities Available-for-Sale

The following tables present the amortized cost, gross unrealized gains, gross unrealized losses and the fair value for securities available-for-sale at March 31, 2018 and September 30, 2017:

	March 31, 2018
	Amortized cost		Gross unrealized gains	Gross unrealized (losses)		Fair value
			(In thousands)
U.S. government and agency obligations	$	54,799	26	(928	)	$	53,897
Mortgage-backed securities and collateralized mortgage obligations	754,862		406	(20,069	)	735,199
Municipal obligations	1,295		—	—		1,295
Corporate debt securities	54,490		270	(748	)	54,012
Trust preferred securities	5,000		—	(348	)	4,652
Equity securities	2,328		830	—		3,158
	$	872,774	1,532	(22,093	)	$	852,213

	September 30, 2017
	Amortized cost		Gross unrealized gains	Gross unrealized (losses)		Fair value
			(In thousands)
U.S. government and agency obligations	$	24,954	35	(116	)	$	24,873
Mortgage-backed securities and collateralized mortgage obligations	479,927		652	(7,088	)	473,491
Municipal obligations	1,357		—	—		1,357
Corporate debt securities	49,489		536	(532	)	49,493
Trust preferred securities	5,000		—	(292	)	4,708
Equity securities	2,482		826	(54	)	3,254
	$	563,209	2,049	(8,082	)	$	557,176

The table below presents the amortized cost and fair value of debt securities available-for-sale at March 31, 2018 by contractual maturity excluding equity securities. Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer.

	March 31, 2018
	Amortized cost		Fair value
	(In thousands)
One year or less	$	1,104	$	1,105
More than one year to five years	45,121		44,385
More than five years to ten years	59,359		59,204
More than ten years	10,000		9,162
	$	115,584	$	113,856
Mortgage-backed securities and collateralized mortgage obligations	754,862		735,199
	$	870,446	$	849,055

Mortgage-backed securities and collateralized mortgage obligations totaling $754.9 million at amortized cost and $735.2 million at fair value are excluded from the maturity table above as their expected lives are likely to be shorter than the contractual maturity date due to principal prepayments.

For the three months ended March 31, 2018, proceeds from the sales of securities-available for sale totaled $9.7 million, resulting in $116 thousand of gross gains and zero losses. For the six months ended March 31, 2018, proceeds from sales of securities available-for-sale totaled $9.8 million, resulting in $116 thousand of gross gains and $61 thousand of gross losses.

There were no sales of securities from the available-for-sale investment portfolio for the three months ended March 31, 2017. For the six months ended March 31, 2017, proceeds from the sales of securities available-for-sale totaled $57.4 million, resulting in gross gains of $500 thousand and gross losses of $89 thousand.

Securities available-for-sale with a fair value of $187.6 million and $302.9 million at March 31, 2018 and September 30, 2017 were sold under agreements to repurchase or were pledged as security for deposits of public funds as required and permitted by law.

The following tables summarize the fair value and gross unrealized losses of those securities that reported an unrealized loss at March 31, 2018 and September 30, 2017 and if the unrealized loss position was continuous for the twelve months prior to March 31, 2018 and September 30, 2017:

	March 31, 2018
	Less than 12 months				12 months or longer			Total
	Fair Value		Gross unrealized (losses)		Fair value	Gross unrealized (losses)		Fair value	Gross unrealized (losses)
	(In thousands)
U.S. government and agency obligations	$	44,092	(722	)	4,774	(206	)	48,866	$	(928	)
Mortgage-backed securities and collateralized mortgage obligations	485,994		(11,572	)	156,550	(8,497	)	642,544	(20,069		)
Corporate debt securities	14,894		(98	)	9,351	(650	)	24,245	(748		)
Trust preferred securities	4,652		(348	)	—	—		4,652	(348		)
	$	549,632	(12,740	)	170,675	(9,353	)	720,307	$	(22,093	)

	September 30, 2017
	Less than 12 months				12 months or longer			Total
	Fair Value		Gross unrealized (losses)		Fair value	Gross unrealized (losses)		Fair value	Gross unrealized (losses)
	(In thousands)
U.S. government and agency obligations	$	14,831	(116	)	—	—		14,831	$	(116	)
Mortgage-backed securities and collateralized mortgage obligations	329,554		(5,346	)	49,695	(1,742	)	379,249	(7,088		)
Corporate debt securities	9,824		(176	)	9,644	(356	)	19,468	(532		)
Trust preferred securities	—		—		4,708	(292	)	4,708	(292		)
Equity securities	98		(54	)	—	—		98	(54		)
	$	354,307	(5,692	)	64,047	(2,390	)	418,354	$	(8,082	)

The Company evaluates securities for other-than-temporary impairment at each reporting period and more frequently when economic or market conditions warrant such evaluation. The temporary loss position associated with securities available-for-sale was the result of changes in market interest rates relative to the coupon of the individual security and changes in credit spreads. The Company does not have the intent to sell securities in a temporary loss position at March 31, 2018, nor is it more likely than not that the Company will be required to sell the securities before the anticipated recovery.

The Company did not record an other-than-temporary impairment charge on securities in the available-for-sale portfolio for the three and six months ended March 31, 2018 and 2017.

Securities Held-to-Maturity

The following tables present the amortized cost, gross unrealized gains, gross unrealized losses and the fair value for securities held-to-maturity at March 31, 2018 and September 30, 2017:

	March 31, 2018
	Amortized cost		Gross unrealized gains	Gross unrealized (losses)		Fair value
	(In thousands)
U.S. government and agency obligations	$	13,402	—	(243	)	$	13,159
Mortgage-backed securities and collateralized mortgage obligations	240,729		530	(8,941	)	232,318
	$	254,131	530	(9,184	)	$	245,477

	September 30, 2017
	Amortized cost		Gross unrealized gains	Gross unrealized (losses)		Fair value
	(In thousands)
U.S. government and agency obligations	$	3,407	—	(7	)	$	3,400
Mortgage-backed securities and collateralized mortgage obligations	129,532		—	(1,110	)	128,422
	$	132,939	—	(1,117	)	$	131,822

The table below presents the amortized cost and fair value of debt securities held-to-maturity at March 31, 2018 by contractual maturity. Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer.

	March 31, 2018
	Amortized cost		Fair value
	(In Thousands)
More than five years to ten years	$	13,402	$	13,159
	13,402		13,159
Mortgage-backed securities and collateralized mortgage obligations	240,729		232,318
	$	254,131	$	245,477

Mortgage-backed securities and collateralized mortgage obligations totaling $240.7 million at amortized cost and $232.3 million at fair value are excluded from the maturity table above as their expected lives are likely to be shorter than the contractual maturity date due to principal prepayments.

Securities held-to-maturity with a fair value of $124.6 million and zero at March 31, 2018 and September 30, 2017 were sold under agreements to repurchase or were pledged as security for deposits of public funds as required and permitted by law.

There were no sales of securities from the held-to-maturity investment portfolio for the three and six months ended March 31, 2018 and 2017.

The following tables summarize the fair value and gross unrealized losses of those securities that reported an unrealized loss at March 31, 2018 and September 30, 2017 and if the unrealized loss position was continuous for the twelve months prior to March 31, 2018 and September 30, 2017:

	March 31, 2018
	Less than 12 months				12 months or longer			Total
	Fair Value		Gross unrealized (losses)		Fair value	Gross unrealized (losses)		Fair value	Gross unrealized (losses)
	(In thousands)
U.S. government and agency obligations	$	8,160	(243	)	—	—		8,160	$	(243	)
Mortgage-backed securities and collateralized mortgage obligations	139,886		(4,300	)	69,110	(4,641	)	208,996	(8,941		)
	$	148,046	(4,543	)	69,110	(4,641	)	217,156	$	(9,184	)

	September 30, 2017
	Less than 12 months				12 months or longer			Total
	Fair Value		Gross unrealized (losses)		Fair value	Gross unrealized (losses)		Fair value	Gross unrealized (losses)
	(In thousands)
U.S. government and agency obligations	$	—	—		3,400	(7	)	3,400	$	(7	)
Mortgage-backed securities and collateralized mortgage obligations	29,965		(349	)	96,076	(761	)	126,041	(1,110		)
	$	29,965	(349	)	99,476	(768	)	129,441	$	(1,117	)

The Company evaluates securities for other-than-temporary impairment at each reporting period and more frequently when economic or market conditions warrant such evaluation. The temporary loss position associated with securities held-to-maturity was the result of changes in market interest rates relative to the coupon of the individual security and changes in credit spreads. The Company does not have the intent to sell securities in a temporary loss position at March 31, 2018, nor is it more likely than not that the Company will be required to sell the securities before the anticipated recovery.

The Company did not record an other-than-temporary impairment charge on securities in the held-to-maturity portfolio for the three and six months ended March 31, 2018 and 2017.

XML

Loans Receivable and Allowance for Loan Losses

6 Months Ended

Mar. 31, 2018

Receivables [Abstract]

Loans Receivable and Allowance for Loan Losses

Loans Receivable and Allowance for Loan Losses

Loans receivable at March 31, 2018 and September 30, 2017 are summarized as follows:

	March 31,			September 30,
	2018			2017
	(In thousands)
Real estate loans:
One-to-four family	$	1,689,375		$	1,578,835
Multifamily and commercial	1,888,745			1,821,982
Construction	241,699			218,408
Commercial business loans	273,325			267,664
Consumer loans:
Home equity loans and advances	433,108			464,962
Other consumer loans	1,339			1,270
Total loans	4,527,591			4,353,121
Net deferred loan costs	12,280			9,135
Allowance for loan losses	(59,952		)	(54,633		)
Loans receivable, net	$	4,479,919		$	4,307,623

The Company had no loans held for sale at March 31, 2018 and September 30, 2017.

The Company purchased $2.7 million of residential loans and $2.1 million of commercial real estate loans from third parties during the three months ended March 31, 2018. The Company purchased $7.4 million of residential loans from third parties during the three months ended March 31, 2017. During the six months ended March 30, 2018, the Company purchased $8.9 million of residential loans and $51.9 million of commercial real estate loans. During the six months ended March 31, 2017, the total residential loans purchased were $16.8 million.

At March 31, 2018 and September 30, 2017, the carrying value of real estate loans serviced by the Company for investors was $464.3 million and $493.2 million, respectively.

The following tables summarize the aging of loans receivable by portfolio segment at March 31, 2018 and September 30, 2017:

	March 31, 2018
	30-59 days		60-89 days	Greater than 90 days	Total past due	Current	Total
	(In Thousands)
Real estate loans:
One to four family	$	5,201	1,706	2,565	9,472	1,679,903	$	1,689,375
Multifamily and commercial	504		—	118	622	1,888,123	1,888,745
Construction	—		—	—	—	241,699	241,699
Commercial business loans	355		—	407	762	272,563	273,325
Consumer loans:
Home equity loans advances	797		321	636	1,754	431,354	433,108
Other consumer loans	—		7	—	7	1,332	1,339
Total loans	$	6,857	2,034	3,726	12,617	4,514,974	$	4,527,591

	September 30, 2017
	30-59 days		60-89 days	Greater than 90 days	Total past due	Current	Total
	(In thousands)
Real estate loans:
One to four family	$	3,924	932	3,496	8,352	1,570,483	$	1,578,835
Multifamily and commercial	—		123	1,510	1,633	1,820,349	1,821,982
Construction	—		—	—	—	218,408	218,408
Commercial business loans	—		388	1,038	1,426	266,238	267,664
Consumer loans:
Home equity loans advances	1,437		187	351	1,975	462,987	464,962
Other consumer loans	1		—	—	1	1,269	1,270
Total loans	$	5,362	1,630	6,395	13,387	4,339,734	$	4,353,121

The Company considers a loan to be delinquent when we have not received a payment within 30 days of its contractual due date. A loan is designated as a non-accrual loan when the payment of interest is more than three months in arrears of its contractual due date. The accrual of income on a non-accrual loan is reversed and discontinued until the outstanding payments in arrears have been collected. The Company identifies loans that may need to be charged-off as a loss by reviewing all delinquent loans, classified loans and other loans that management may have concerns about collectability.

At March 31, 2018 and September 30, 2017, there were no loans past due 90 days or more and still accruing interest.

The following table summarizes loans receivable and allowance for loan losses by portfolio segment and impairment method:

	March 31, 2018
	One to four family		Multifamily and commercial	Construction	Commercial Business	Home equity loans and advances	Other consumer	Unallocated	Total
	(In thousands)
Allowance for loan losses:
Individually evaluated for impairment	$	510	—	—	369	12	—	—	$	891
Collectively evaluated for impairment	18,318		19,097	6,574	10,431	3,912	7	722	59,061
Total	$	18,828	19,097	6,574	10,800	3,924	7	722	$	59,952
Total loans:
Individually evaluated for impairment	$	10,825	2,579	—	3,409	3,083	—	—	$	19,896
Collectively evaluated for impairment	1,678,550		1,886,166	241,699	269,916	430,025	1,339	—	4,507,695
Total	$	1,689,375	1,888,745	241,699	273,325	433,108	1,339	—	$	4,527,591

	September 30, 2017
	One to four family		Multifamily and commercial	Construction	Commercial Business	Home equity loans and advances	Other consumer	Unallocated	Total
	(In thousands)
Allowance for loan losses:
Individually evaluated for impairment	$	407	35	—	84	14	—	—	$	540
Collectively evaluated for impairment	18,126		17,994	5,299	8,396	4,176	8	94	54,093
Total	$	18,533	18,029	5,299	8,480	4,190	8	94	$	54,633
Total loans:
Individually evaluated for impairment	$	12,247	6,343	—	4,327	2,998	—	—	$	25,915
Collectively evaluated for impairment	1,566,588		1,815,639	218,408	263,337	461,964	1,270	—	4,327,206
Total	$	1,578,835	1,821,982	218,408	267,664	464,962	1,270	—	$	4,353,121

Loan modifications to borrowers experiencing financial difficulties that are considered Troubled Debt Restructurings ("TDRs") primarily involve the lowering of the monthly payments on such loans through either a reduction in interest rate below a market rate, an extension of the term of the loan without a corresponding adjustment to the risk premium reflected in the interest rate, or a combination of these two methods. These modifications generally do not result in the forgiveness of principal or accrued interest. In addition, the Company attempts to obtain additional collateral or guarantor support when modifying such loans. Non-accruing restructured loans may be returned to accrual status when there has been a sustained period of repayment performance (generally six consecutive months of payments) and both principal and interest are deemed collectible.

The following tables present the number of loans modified as TDRs during the three and six months ended March 31, 2018 and 2017, along with their balances immediately prior to the modification date and post-modification. Post-modification recorded investment represents the net book balance immediately following modification.

	For the Three Months Ended
	March 31, 2018					March 31, 2017
	No. of Loans	Pre-modification recorded investment		Post-modification recorded investment		No. of Loans	Pre-modification recorded investment		Post-modification recorded investment
		(In thousands)					(In thousands)
Troubled Debt Restructurings
Real estate loans:
One to four family	1	$	588	$	588	1	$	83	$	83
Consumer loans:
Home equity loans and advances	1	84		84		—	—		—
Total loans	2	$	672	$	672	1	$	83	$	83

	For the Six Months Ended
	March 31, 2018					March 31, 2017
	No. of Loans	Pre-modification recorded investment		Post-modification recorded investment		No. of Loans	Pre-modification recorded investment		Post-modification recorded investment
		(In thousands)					(In thousands)
Troubled Debt Restructurings
Real estate loans:
One to four family	1	$	588	$	588	3	$	340	$	340
Home equity loans and advances	1	84		84		1	108		108
Total loans	2	$	672	$	672	4	$	448	$	448

The activity in the allowance for loan losses by portfolio segment for the three and six months ended March 31, 2018 and 2017 was as follows:

	For the Three Months Ended March 31,
	One to four family			Multifamily and commercial		Construction		Commercial Business		Home equity loans and advances		Other consumer		Unallocated		Total
	(In Thousands)
2018
Balance at beginning of period	$	19,991		19,933		5,217		8,275		4,576		8		178		$	58,178
Provision charged (credited)	(1,229		)	(707	)	1,354		2,697		(657	)	(2	)	544		2,000
Recoveries	120			—		3		52		5		1		—		181
Charge-offs	(54		)	(129	)	—		(224	)	—		—		—		(407		)
Balance at end of period	$	18,828		19,097		6,574		10,800		3,924		7		722		$	59,952
2017
Balance at beginning of period	$	18,599		17,616		4,598		6,358		4,231		11		436		$	51,849
Provision charged (credited)	380			189		(345	)	579		(39	)	1		(390	)	375
Recoveries	22			—		—		77		7		—		—		106
Charge-offs	(183		)	(167	)	—		—		(70	)	(2	)	—		(422		)
Balance at end of period	$	18,818		17,638		4,253		7,014		4,129		10		46		$	51,908

	For the Six Months Ended March 31,
	One to four family			Multifamily and commercial		Construction		Commercial Business		Home equity loans and advances		Other consumer		Unallocated		Total
2018
Balance at beginning of period	$	18,533		18,029		5,299		8,480		4,190		8		94		$	54,633
Provision charged (credited)	245			1,199		1,272		2,322		(267	)	1		628		5,400
Recoveries	130			—		3		225		10		3		—		371
Charge-offs	(80		)	(131	)	—		(227	)	(9	)	(5	)	—		(452		)
Balance at end of period	$	18,828		19,097		6,574		10,800		3,924		7		722		$	59,952
2017
Balance at beginning of period	$	18,638		17,390		5,960		4,052		5,721		11		95		$	51,867
Provision charged (credited)	353			415		(1,707	)	2,889		(1,531	)	5		(49	)	375
Recoveries	26			—		—		96		13		—		—		135
Charge-offs	(199		)	(167	)	—		(23	)	(74	)	(6	)	—		(469		)
Balance at end of period	$	18,818		17,638		4,253		7,014		4,129		10		46		$	51,908

The following table presents loans individually evaluated for impairment by loan segment:

	March 31, 2018
	Recorded investment		Unpaid principal balance		Specific allowance
	(In thousands)
With no allowance recorded:
Real estate loans:
One to four family	$	7,955	$	9,143	$	—
Multifamily and commercial	2,579		3,454		—
Commercial business loans	426		119		—
Consumer loans:
Home equity loans and advances	2,733		3,088		—
	13,693		15,804		—
With a specific allowance recorded:
Real estate loans:
One to four family	2,870		2,913		510
Commercial business loans	2,983		2,774		369
Consumer loans:
Home equity loans and advances	350		350		12
	6,203		6,037		891
Total:
Real estate loans:
One to four family	10,825		12,056		510
Multifamily and commercial	2,579		3,454		—
Commercial business loans	3,409		2,893		369
Consumer loans:
Home equity loans and advances	3,083		3,438		12
Total loans	$	19,896	$	21,841	$	891

	September 30, 2017
	Recorded investment		Unpaid principal balance		Specific allowance
	(In thousands)
With no allowance recorded:
Real estate loans:
One to four family	$	9,272	$	10,156	$	—
Multifamily and commercial	4,701		5,577		—
Commercial business loans	1,545		2,038		—
Consumer loans:
Home equity loans and advances	2,745		3,214		—
	18,263		20,985		—
With a specific allowance recorded:
Real estate loans:
One to four family	2,975		2,989		407
Multifamily and commercial	1,642		2,215		35
Commercial business loans	2,782		2,782		84
Consumer loans:
Home equity loans and advances
	253		253		14
Total:	7,652		8,239		540
Real estate loans:
One to four family	12,247		13,145		407
Multifamily and commercial	6,343		7,792		35
Commercial business loans	4,327		4,820		84
Consumer loans:
Home equity loans and advances	2,998		3,467		14
Total loans	$	25,915	$	29,224	$	540

Specific allocations of the allowance for loan losses attributable to impaired loans totaled $891 thousand and $540 thousand at March 31, 2018 and September 30, 2017, respectively. At March 31, 2018 and September 30, 2017, impaired loans for which there was no related allowance for loan losses totaled $13.7 million and $18.3 million, respectively.

The following table presents interest income recognized for loans individually evaluated for impairment by loan segment for the three and six months ended March 31, 2018 and 2017:

	For the Three Months Ended
	March 31, 2018				March 31, 2017
	Average recorded Investment		Interest Income Recognized		Average recorded Investment		Interest Income Recognized
	(In thousands)				(In thousands)
Real estate loans:
One to four family	$	11,235	$	102	$	16,061	$	142
Multifamily and commercial	3,136		26		3,825		14
Commercial business loans	3,836		26		3,797		26
Consumer loans:
Home equity loans and advances	2,837		36		4,122		35
Total loans	$	21,044	$	190	$	27,805	$	217

	For the Six Months Ended
	March 31, 2018				March 31, 2017
	Average recorded Investment		Interest Income Recognized		Average recorded Investment		Interest Income Recognized
	(In thousands)				(In thousands)
Real estate loans:
One to four family	$	11,572	$	212	$	16,747	$	260
Multifamily and commercial	4,205		65		5,665		84
Construction	—		—		168		—
Commercial business loans	4,000		72		4,036		75
Consumer loans:
Home equity loans and advances	2,891		71		3,897		69
Total loans	$	22,668	$	420	$	30,513	$	488

The Company utilizes an internal eight-point risk rating system to summarize its loan portfolio into categories with similar risk characteristics. Loans deemed to be “acceptable quality” are rated 1 through 4, with a rating of 1 established for loans with minimal risk. Loans that are deemed to be of “questionable quality” are rated 5 (Special Mention) or 6 (Substandard). Loans with adverse classifications are rated 7 (Doubtful) or 8 (Loss). The risk ratings are also confirmed through periodic loan review examinations which are currently performed by both an independent third-party and the Company's internal loan review department. Results from examinations are presented to the Audit Committee of the Board of Directors.

The following table presents loans receivable by credit quality risk indicator and by loan segment:

	March 31, 2018
	Real Estate
	One to four family		Multifamily and commercial	Construction	Commercial Business	Home equity loans and advances	Other consumer	Total
	(In thousands)
Pass	$	1,680,034	1,871,631	241,699	265,153	431,096	1,339	$	4,490,952
Special mention	—		3,764	—	3,619	—	—	7,383
Substandard	9,341		13,350	—	4,553	2,012	—	29,256
Doubtful	—		—	—	—	—	—	—
Total	$	1,689,375	1,888,745	241,699	273,325	433,108	1,339	$	4,527,591

	September 30, 2017
	Real Estate
	One to four family		Multifamily and commercial	Construction	Commercial Business	Home equity loans and advances	Other consumer	Total
	(In thousands)
Pass	$	1,569,064	1,796,786	218,408	258,454	463,257	1,270	$	4,307,239
Special mention	—		11,600	—	3,347	—	—	14,947
Substandard	9,771		13,596	—	5,863	1,705	—	30,935
Doubtful	—		—	—	—	—	—	—
Total	$	1,578,835	1,821,982	218,408	267,664	464,962	1,270	$	4,353,121

XML

Deposits

6 Months Ended

Mar. 31, 2018

Banking and Thrift [Abstract]

Deposits

Deposits

Deposits at March 31, 2018 and September 30, 2017 are summarized as follows:

	March 31,		September 30,
	2018		2017
	(In Thousands)
Non-interest bearing transaction	$	709,684	$	676,067
Interest bearing transaction	1,411,361		1,268,833
Money market deposit accounts	358,818		273,605
Savings, including club deposits	1,490,173		546,449
Certificates of deposit	1,425,217		1,358,474
Total deposits	$	5,395,253	$	4,123,428

The increase in deposits during the six months ended March 31, 2018 was primarily the result of subscription funds received in connection with the Company's minority public offering.

The aggregate amount of certificates of deposit that meet or exceed $100,000 is approximately $656.8 million and $608.5 million as of March 31, 2018 and September 30, 2017, respectively.

A summary of certificate accounts by maturity at March 31, 2018 and September 30, 2017 are summarized as follows:

	March 31,		September 30,
	2018		2017
	(In Thousands)
Less than one year	$	693,173	$	657,741
More than one years to two years	492,169		338,265
More than two years to three years	160,472		248,779
More than three years to four years	59,663		81,959
More than four years	19,740		31,730
	$	1,425,217	$	1,358,474

XML

Components of Periodic Benefit Costs

6 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Components of Periodic Benefit Costs

Components of Periodic Benefit Costs

The Bank has a defined benefit pension plan (the "Pension Plan") covering its full-time employees who satisfy the eligibility requirements. The benefits are based on years of service and the employee's compensation during the last five years of employment. Costs of the Pension Plan, based on the actuarial computations of the current future benefits for employees, are recognized to expense and are funded in part based on the maximum amount that can be deducted for federal income tax purposes. The Pension Plan’s assets are primarily invested in fixed debt and equity securities.

In addition to the Pension Plan, certain health care and life insurance benefits are made available to retirement employees (the "Post-retirement Plan").

The Bank has a retirement income maintenance plan (the "RIM Plan"). The RIM Plan is a non-qualified defined benefit plan which provides benefits to all employees of the Bank if their benefits under the Pension Plan are limited by the Internal Revenue Code Sections 415 and 401(a)(17).

Net periodic benefit cost (income) for pension benefits and other benefits for the three and six months ended March 31, 2018 and 2017 includes the following components:

	For the Three Months Ended March 31,
	Pension						RIM				Post-retirement
	2018			2017			2018		2017		2018			2017
	(In thousands)
Service cost	$	1,780		$	1,905		$	61	$	59	$	93		$	118
Interest cost	2,129			2,111			111		107		205			186
Expected return on plan assets	(4,815		)	(6,202		)	—		—		—			—
Amortization:
Prior service cost	—			—			—		—		(34		)	(34		)
Net loss	707			2,750			103		113		69			81
Net periodic cost (income)	$	(199	)	$	564		$	275	$	279	$	333		$	351

	For the Six Months Ended March 31,
	Pension				RIM		Post-retirement
	2018		2017		2018	2017	2018		2017
	(In thousands)
Service cost	3,560		3,811		122	119	186		236
Interest cost	4,258		4,222		222	215	410		371
Expected return on plan assets	(9,630	)	(12,405	)	—	—	—		—
Amortization:
Prior service cost	—		—		—	—	(68	)	(68	)
Net loss	1,414		5,499		206	227	138		163
Net periodic cost (income)	(398	)	1,127		550	561	666		702

The net periodic benefit cost (income) for pension benefits and other benefits at March 31, 2018 were calculated using the December 31, 2017 third party actuarial valuation reports. For March 31, 2017, the September 30, 2017 third party actuarial valuation reports were utilized as a proxy to estimate the net periodic benefit cost for pension benefits.

XML

Fair Value Measurements

6 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

The Company utilizes fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. The determination of fair values of financial instruments often requires the use of estimates. Where quoted market values in an active market are not readily available, the Company utilizes various valuation techniques to estimate fair value.

Fair value is an estimate of the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. However, in many instances, fair value estimates may not be substantiated by comparison to independent markets and may not be realized in an immediate sale of the financial instrument.

U.S. GAAP establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of fair value hierarchy are as follows:

Level 1:     Unadjusted quoted market prices in active markets that are accessible at the measurement date for identical,

unrestricted assets or liabilities;

Level 2: Quoted prices in markets that are not active, or inputs that are observable either directly or indirectly for

substantially the full term of the asset or liability; and

Level 3: Prices or valuation techniques that require inputs that are both significant to the fair value measurement and

unobservable (i.e., supported by minimal or no market activity).

A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement.

The valuation techniques are based upon the unpaid principal balance only and exclude any accrued interest or dividends at the measurement date. Interest income and expense and dividend income are recorded within the consolidated statements of income depending on the nature of the instrument using the effective interest method based on the discount or premium.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The valuation techniques described below were used to measure fair value of financial instruments in the tables below on a recurring basis as of March 31, 2018 and September 30, 2017.

Securities Available-for-Sale

For securities available-for-sale, fair value was estimated using a market approach. The majority of the Company’s securities are fixed income instruments that are not quoted on an exchange, but are traded in active markets. Prices for these instruments are obtained through third-party data service providers or dealer market participants with which the Company has historically transacted both purchases and sales of securities. Prices obtained from these sources include market quotations and matrix pricing. Matrix pricing, a Level 2 input, is a mathematical technique used principally to value certain securities to benchmark or to comparable securities. The Company evaluates the quality of Level 2 matrix pricing through comparison to similar assets with greater liquidity and evaluation of projected cash flows. As the Company is responsible for the determination of fair value, it performs quarterly analysis on the prices received from the pricing service to determine whether the prices are reasonable estimates of fair value. Specifically, the Company compares the prices received from the pricing service to a secondary pricing source. Additionally, the Company compares changes in the reported market values and returns to relevant market indices to assess the reasonableness of the reported prices. The Company’s internal price verification procedures and review of fair value methodology documentation provided by independent pricing services has not historically resulted in an adjustment in the prices obtained from the pricing service. The Company also holds equity securities and debt instruments issued by the U.S. government and U.S. government-sponsored agencies that are traded in active markets with readily accessible quoted market prices that are considered Level 1 inputs.

Derivatives

The Company records all derivatives on the consolidated balance sheets at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting.

The fair value of the Company's derivatives are determined using discounted cash flow analysis using observable market-based inputs, which are considered Level 2 inputs.

Assets Measured at Fair Value on a Non-Recurring Basis

The valuation techniques described below were used to estimate fair value of financial instruments measured on a non-recurring basis as of March 31, 2018 and September 30, 2017.

Collateral Dependent Impaired Loans

For loans measured for impairment based on the fair value of the underlying collateral, fair value was estimated using a market approach. The Company measures the fair value of collateral underlying impaired loans primarily through obtaining independent appraisals that rely upon quoted market prices for similar assets in active markets. These appraisals include adjustments, on an individual case-by-case basis, to comparable assets based on the appraisers’ market knowledge and experience, as well as adjustments for estimated costs to sell between 6% and 8%. The Company classifies these loans as Level 3 within the fair value hierarchy.

Foreclosed Assets

Assets acquired through foreclosure or deed in lieu of foreclosure are carried at fair value, less estimated selling costs which is estimated to be 6%. Fair value is generally based on independent appraisals that rely upon quoted market prices for similar assets in active markets. These appraisals include adjustments, on an individual case basis, to comparable assets based on the appraiser's market knowledge and experience, and are classified as Level 3. When an asset is acquired, the excess of the loan balance over fair value less estimated selling costs is charged to the allowance for loan losses. Operating results from real estate owned, including rental income, operating expenses, and gains and losses realized from the sales of real estate owned, are recorded as incurred.

There were no changes to the valuation techniques for fair value measurements as of March 31, 2018 and September 30, 2017.

The following tables present the assets and liabilities reported on the consolidated balance sheets at their fair values as of March 31, 2018 and September 30, 2017, by level within the fair value hierarchy:

	March 31, 2018
			Fair value measurements
	Fair value		Quoted prices in active markets for identical assets (Level 1)	Significant other observable inputs (Level 2)	Significant unobservable inputs (Level 3)
	(In thousands)
Measured on a recurring basis:
Securities available-for-sale:
U.S. government and agency obligations	$	53,897	53,897	—	$	—
Mortgage-backed securities and collateralized mortgage obligations	735,199		—	735,199	—
Municipal obligations	1,295		—	1,295	—
Corporate debt securities	54,012		—	54,012	—
Trust preferred securities	4,652		—	4,652	—
Equity securities	3,158		3,158	—	—
Total securities available-for-sale	$	852,213	57,055	795,158	$	—
Derivative assets	669		—	669	—
	$	852,882	57,055	795,827	$	—

	September 30, 2017
			Fair value measurements
	Fair value		Quoted prices in active markets for identical assets (Level 1)	Significant other observable inputs (Level 2)	Significant unobservable inputs (Level 3)
	(In thousands)
Measured on a recurring basis:
Securities available-for-sale:
U.S. government and agency obligations	$	24,873	24,873	—	$	—
Mortgage-backed securities and collateralized mortgage obligations	473,491		—	473,491	—
Municipal obligations	1,357		—	1,357	—
Corporate debt securities	49,493		—	49,493	—
Trust preferred securities	4,708		—	4,708	—
Equity securities	3,254		3,254	—	—
Total securities available-for-sale	557,176		28,127	529,049	—
Derivative assets	277		—	277	—
	$	557,453	28,127	529,326	$	—
Derivative liabilities	$	182	—	182	$	—

There were no transfers between Level 1, Level 2 and Level 3 during the three and six months ended March 31, 2018 and during the year-ended September 30, 2017.

	March 31, 2018
			Fair value measurements
	Fair value		Quoted prices in active markets for identical assets (Level 1)	Significant other observable inputs (Level 2)	Significant unobservable inputs (Level 3)
	(In thousands)
Measured on a non-recurring basis:
Real estate owned	$	959	—	—	$	959
Loans measured for impairment based on the fair value of the underlying collateral	9,449		—	—	9,449
	$	10,408	—	—	$	10,408

	September 30, 2017
			Fair value measurements
	Fair value		Quoted prices in active markets for identical assets (Level 1)	Significant other observable inputs (Level 2)	Significant unobservable inputs (Level 3)
	(In thousands)
Measured on a non-recurring basis:
Real estate owned	$	393	—	—	$	393
Loans measured for impairment based on the fair value of the underlying collateral	14,156				14,156
	$	14,549	—	—	$	14,549

The following table presents qualitative information for Level 3 assets measured at fair value on a non-recurring basis as of March 31, 2018 and September 30, 2017:

	March 31, 2018
	Fair value		Valuation methodology	Unobservable inputs	Range of inputs
	(In Thousands)
Real estate owned	$	959	Appraised Value	Discount for cost to sell	6.0%
Loans measured for impairment based on the fair value of the underlying collateral	$	9,449	Appraised Value	Discount for cost to sell	6.0% - 8.0%

	September 30, 2017
	Fair value		Valuation methodology	Unobservable inputs	Range of inputs
	(In Thousands)
Real estate owned	$	393	Appraised Value	Discount for cost to sell	6.0%
Loans measured for impairment based on the fair value of the underlying collateral	$	14,156	Appraised Value	Discount for cost to sell	6.0% - 8.0%

Other Fair Value Disclosures

The Company is required to disclose estimated fair value of financial instruments, both assets and liabilities on and off the balance sheet, for which it is practicable to estimate fair value. A description of the valuation methodologies used for those assets and liabilities not recorded at fair value on a recurring or non-recurring basis are set forth below.

Cash and Cash Equivalents

For cash and due from banks, federal funds sold and short-term investments, the carrying amount approximates fair value due to their nature and short-term maturities.

Investment Securities Held-to-Maturity

For securities held-to-maturity, fair value was estimated using a market approach. The majority of the Company’s securities are fixed income instruments that are not quoted on an exchange, but are traded in active markets. Prices for these instruments are obtained through third-party data service providers or dealer market participants with which the Company has historically transacted both purchases and sales of securities. Prices obtained from these sources include market quotations and matrix pricing. Matrix pricing, a Level 2 input, is a mathematical technique used principally to value certain securities to benchmark or to compare securities. The Company evaluates the quality of Level 2 matrix pricing through comparison to similar assets with greater liquidity and evaluation of projected cash flows. As the Company is responsible for the determination of fair value, it performs quarterly analysis on the prices received from the pricing service to determine whether the prices are reasonable estimates of fair value. Specifically, the Company compares the prices received from the pricing service to a secondary pricing source. Additionally, the Company compares changes in the reported market values and returns to relevant market indices to assess the reasonableness of the reported prices. The Company’s internal price verification procedures and review of fair value methodology documentation provided by independent pricing services has not historically resulted in an adjustment in the prices obtained from the pricing service. The Company also holds debt instruments issued by the U.S. government and U.S. government-sponsored agencies that are traded in active markets with readily accessible quoted market prices that are considered Level 1 inputs.

Federal Home Loan Bank Stock ("FHLB")

The carrying value of FHLB stock is its cost. The fair value of FHLB stock is based on redemption at par value. The Company classifies the estimated fair value as Level 2 within the fair value hierarchy.

Loans Receivable

Fair values are estimated for portfolios of loans with similar financial characteristics. Loans are segregated by type such as commercial mortgage, residential mortgage, commercial, construction, etc. Each applicable loan category is further segmented into fixed and adjustable rate interest terms and into performing and non-performing categories. The fair value of performing loans is estimated using a combination of techniques, including a discounted cash flow model that utilizes a discount rate that reflects the Company’s current pricing for loans with similar characteristics and remaining maturity, adjusted by an amount for estimated credit losses inherent in the portfolio at the balance sheet date. The rates take into account the expected yield curve, as well as an adjustment for prepayment risk, when applicable. The fair value estimated does not incorporate an exit value. The Company classifies the estimated fair value of its loan portfolio as Level 3.

The fair value for non-performing loans was based on recent external appraisals of collateral securing such loans, adjusted for the timing of anticipated cash flows. The Company classifies the estimated fair value of its non-performing loan portfolio as Level 3.

Deposits

The fair value of deposits with no stated maturity, such as non-interest bearing demand deposits and savings deposits, was equal to the amount payable on demand and classified as Level 2. The estimated fair value of certificates of deposit was based on the discounted value of contractual cash flows. The discount rate was estimated using the Company’s current rates offered for deposits with similar remaining maturities. The Company classifies the estimated fair value of its certificates of deposit portfolio as Level 2.

Borrowed Funds

The fair value of borrowed funds was estimated by discounting future cash flows using rates available for debt with similar terms and maturities and is classified by the Company as Level 2 within the fair value hierarchy.

Commitments to Extend Credit and Letters of Credit

The fair value of commitments to extend credit and letters of credit was estimated using the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the present creditworthiness of the counter-parties. For fixed rate loan commitments, fair value also considers the difference between current levels of interest rates and the committed rates. The fair value estimates of commitments to extend credit and letters of credit are deemed immaterial in comparison to their carrying value.

The following tables present the assets and liabilities reported on the consolidated balance sheets at their fair values as of March 31, 2018 and September 30, 2017:

	March 31, 2018
			Fair Value Instruments
	Carrying Value		Total Fair Value	Quoted prices in active markets for identical assets (Level 1)	Significant other observable inputs (Level 2)	Significant unobservable inputs (Level 3)
	(In thousands)
Financial assets:
Cash and cash equivalents	$	634,381	634,381	634,381	—	$	—
Securities available-for-sale	852,213		852,213	57,055	795,158	—
Securities held-to-maturity	254,131		245,477	—	245,477	—
Federal Home Loan Bank stock	29,381		29,381	—	29,381	—
Loans receivable, net	4,479,919		4,390,761	—	—	4,390,761
Derivative assets	669		669	—	669	—
Financial liabilities:			—
Total deposits	$	5,395,253	5,382,310	—	5,382,310	$	—
Borrowings	589,430		532,051	—	532,051	—

	September 30, 2017
			Fair Value Instruments
	Carrying Value		Total Fair Value	Quoted prices in active markets for identical assets (Level 1)	Significant other observable inputs (Level 2)	Significant unobservable inputs (Level 3)
	(In thousands)
Financial assets:
Cash and cash equivalents	$	100,975	100,975	100,975	—	$	—
Securities available-for-sale	557,176		557,176	28,127	529,049	—
Securities held-to-maturity	132,939		131,822	—	131,822	—
Federal Home Loan Bank Stock	35,844		35,844	—	35,844	—
Loans receivable, net	4,307,623		4,301,138	—	—	4,301,138
Derivative assets	277		277	—	277	—
Financial liabilities:			—
Total deposits	$	4,123,428	3,880,363	—	3,880,363	$	—
Borrowings	733,043		732,731	—	732,731	—
Derivative liabilities	182		182	—	182	—

Limitations

Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument. Because no market exists for a significant portion of the Company’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments, and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and, therefore, cannot be determined with precision. Changes in assumptions could significantly affect the estimates.

Fair value estimates are based on existing balance sheet financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments. Significant assets and liabilities that are not considered financial assets or liabilities include goodwill and other intangibles, deferred tax assets and premises and equipment. In addition, the tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in the estimates.

XML

Other Comprehensive Income (Loss)

6 Months Ended

Mar. 31, 2018

Equity [Abstract]

Other Comprehensive Income (Loss)

Other Comprehensive Income (Loss)

The following tables present the components of other comprehensive income (loss), both gross and net of tax, for the three and six months ended March 31, 2018 and 2017:

	For the Three Months Ended
	March 31, 2018							March 31, 2017
	Before Tax			Tax Effect		After Tax		Before Tax		Tax Effect		After Tax
	(In thousands)
Components of Other Comprehensive (Loss) Income:
Unrealized gains and losses on securities available-for-sale:
Net losses arising during the period	$	(11,594	)	1,609		(9,985	)	651		(257	)	$	394
Accretion of unrealized loss on securities reclassified as held-to-maturity	(17		)	36		19		—		—		—
Reclassification adjustment for gains included in net income	116			(28	)	88		—		—		—
	(11,495		)	1,617		(9,878	)	651		(257	)	394
Unrealized gain on swap contract	382			(40	)	342		9		(3	)	6
	382			(40	)	342		9		(3	)	6
Employee benefit plans:
Amortization of prior service cost included in net income	(24		)	(19	)	(43	)	(28	)	10		(18		)
Reclassification adjustment of actuarial net (loss) gain included in net income	(8		)	(94	)	(102	)	7		(2	)	5
Change in funded status of retirement obligations	33			(301	)	(268	)	21		(156	)	(135		)
	1			(414	)	(413	)	—		(148	)	(148		)
Total other comprehensive (loss) income	$	(11,112	)	1,163		(9,949	)	660		(408	)	$	252

	For the Six Months Ended
	March 31, 2018							March 31, 2017
	Before Tax			Tax Effect		After Tax		Before Tax		Tax Effect		After Tax
	(In thousands)
Components of Other Comprehensive (Loss) Income:
Unrealized gains and losses on securities available-for-sale:
Net losses arising during the period	$	(14,584	)	1,454		(13,130	)	(23,012	)	8,197		$	(14,815	)
Accretion of unrealized loss on securities reclassified as held-to-maturity	(73		)	90		17		—		—		—
Reclassification adjustment for gains included in net income	55			(27	)	28		411		(144	)	267
	(14,602		)	1,517		(13,085	)	(22,601	)	8,053		(14,548		)
Unrealized loss on swap contract	669			(164	)	505		9		(4	)	5
	669			(164	)	505		9		(4	)	5
Employee benefit plans:
Amortization of prior service cost included in net income	(47		)	(38	)	(85	)	(57	)	20		(37		)
Reclassification adjustment of actuarial net loss included in net income	(18		)	(187	)	(205	)	15		(4	)	11
Change in funded status of retirement obligations	(10,664		)	4,788		(5,876	)	42		(25	)	17
Tax effects resulting from the adoption of ASU No. 2018-02	—			(10,434	)	(10,434	)	—		—		—
	(10,729		)	(5,871	)	(16,600	)	—		(9	)	(9		)
Total other comprehensive (loss)	$	(24,662	)	(4,518	)	(29,180	)	(22,592	)	8,040		$	(14,552	)

The Company, in accordance with ASU No. 2018-02, has elected to reclassify the income tax effects of the Tax Act from accumulated other comprehensive (loss) income to retained earnings for the six months ended March 31, 2018. The following tables present the changes in the components of accumulated other comprehensive (loss) income, net of tax, for the three and six months ended March 31, 2018 and 2017:

	For the Three Months Ended
	March 31, 2018								March 31, 2017
	Unrealized Gains on Securities Available-for- Sale			Swaps	Employee Benefit Plans		Accumulated Other Comprehensive Loss		Unrealized Gains on Securities Available-for-Sale		Swaps	Employee Benefit Plans		Accumulated Other Comprehensive Loss
	(In Thousands)								(In Thousands)
Balance at beginning of year	$	(7,345	)	224	(58,290	)	(65,411	)	(9,279	)	—	(56,883	)	$	(66,162	)
Current period changes in other comprehensive (loss) income	(9,878		)	342	(413	)	(9,949	)	394		6	(148	)	252
Total other comprehensive (loss) income	$	(17,223	)	566	(58,703	)	(75,360	)	(8,885	)	6	(57,031	)	$	(65,910	)

	For the Six Months Ended
	March 31, 2018								March 31, 2017
	Unrealized Gains on Securities Available-for-Sale			Swaps	Employee Benefit Plans		Accumulated Other Comprehensive Loss		Unrealized Gains on Securities Available-for-Sale		Swaps	Employee Benefit Plans		Accumulated Other Comprehensive Loss
	(In Thousands)								(In Thousands)
Balance at beginning of year	$	(4,075	)	—	(42,105	)	(46,180	)	5,664		—	(57,022	)	$	(51,358	)
Current period changes in other comprehensive (loss) income	(11,771		)	465	(6,166	)	(17,472	)	(14,548	)	5	(9	)	(14,552		)
Tax effects resulting from the adoption of ASU No. 2018-02	(1,314		)	40	(10,434	)	(11,708	)	—		—	—		—
Total other comprehensive (loss) income	$	(17,160	)	505	(58,705	)	(75,360	)	(8,884	)	5	(57,031	)	$	(65,910	)

The following table reflects amounts reclassified from accumulated other comprehensive (loss) income to the consolidated statement of income and the affected line item in the statement where net income is presented for the three and six months ended March 31, 2018 and 2017:

	For the Three Months Ended
	March 31, 2018			March 31, 2017
Accumulated other Comprehensive (Loss) Income Components							Affected line items in the Consolidated Statements of Income
Reclassification adjustment for gains included in net income	$	116		$	—		Gains on securities transactions, net
Reclassification adjustment of actuarial net (loss) gain included in net income	(8		)	7			Compensation and employee benefits expense
Total before tax	108			7
Income tax benefit	(122		)	(2		)
Net of tax	$	(14	)	$	5

	For the Six Months Ended
	March 31, 2018			March 31, 2017
Accumulated other Comprehensive (Loss) Income Components							Affected line items in the Consolidated Statements of Income
Reclassification adjustment for gains included in net income	$	55		$	411		Gains on securities transactions, net
Reclassification adjustment of actuarial net (loss) gain included in net income	(18		)	15			Compensation and employee benefits expense
Total before tax	37			426
Income tax benefit	(214		)	(148		)
Net of tax	$	(177	)	$	278

XML

Derivatives and Hedging Activities

6 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives and Hedging Activities

Derivatives and Hedging Activities

The Company offers currency forward contracts and interest rate swap contracts to certain commercial banking customers to manage their risk of exposure and risk management strategies. These contracts are simultaneously hedged by offsetting contracts with a third party, such that the Company would minimize its net risk exposure resulting from these transactions. In addition, the Company executes interest rate swaps with third parties to in order to hedge the interest expense of short-term Federal Home Loan Bank Advances. These contracts are simultaneously hedged with short-term Federal Home Loan Bank Advances.

Currency Forward Contracts. During the quarter ended March 31, 2018, the existing currency forward contacts were settled. At September 30, 2017, the Company had a currency forward contract in place with a commercial banking customer with a notional amount of $1.6 million. An offsetting currency forward contract with a third party was also in place at September 30, 2017. The currency forward contracts associated with this program do not meet hedge accounting requirements. Changes in the fair value of both the customer currency forward contract and the offsetting third party contract are recognized directly in earnings. Derivatives not designated in qualifying hedging relationships are not speculative and result from a service the Company provides to certain qualified commercial banking customers and are not used to manage interest rate risk in the Company's assets or liabilities.

Interest Rate Swaps. At March 31, 2018 and September 30, 2017, the Company did not have any interest rate swaps with commercial banking customers.

The Company had three interest rate swaps in place at March 31, 2018 with offsetting Federal Home Loan Bank advances with a notional amount of $30 million. At September 30, 2017, the Company had two interest rate swaps in place with offsetting Federal Home Loan Bank Advances with a notional amount of $20.0 million. The interest rate swaps associated with the program meet the hedge accounting requirements. The effective portion of changes in the fair value of the derivatives designated that qualify as cash flow hedges are recorded in accumulated other comprehensive income (loss). The ineffective portion of changes in the fair value of the derivatives designated that qualify as cash flow hedges are recorded in earnings. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counter-party in exchange for the Company making fixed-rate payment payments over the life of the agreements without the exchange of the underlying notional amount.

For the three and six months ended March 31, 2018 and 2017, the Company did not record any hedge ineffectiveness associated with these contracts.

The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the Consolidated Balance Sheets at March 31, 2018 and September 30, 2017:

	March 31, 2018
	Asset Derivative			Liability Derivative
	Consolidated Balance Sheet	Fair value		Consolidated Balance Sheet	Fair Value
		(In thousands)			(In thousands)
Derivatives:
Interest rate swap - cash flow hedge	Other Assets	$	669	Other Liabilities	$	—
Total derivative instruments		$	669		$	—
	September 30, 2017
	Asset Derivative			Liability Derivative
	Consolidated Balance Sheet	Fair value		Consolidated Balance Sheet	Fair Value
		(In thousands)			(In thousands)
Derivatives:
Interest rate swap - cash flow hedge	Other Assets	95		Other Liabilities	$	—
Currency forward contract - non-designated hedge	Other Assets	182		Other Liabilities	182
Total derivative instruments		$	277		$	182

For the three and six months ended March 31, 2018 and 2017, no gains or losses were recorded in the consolidated statements of income.

The Company has agreements with counter-parties that contain a provision that if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default of its derivative obligations.

At March 31, 2018 and September 30, 2017, the fair value of derivatives was in a net asset position. At March 31, 2018 and September 30, 2017, accrued interest was $2 thousand and $9 thousand, respectively.

XML

Subsequent Events

6 Months Ended

Mar. 31, 2018

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

The Company has evaluated events subsequent to March 31, 2018 and through the financial statement issuance date of May 14, 2018. On April 19, 2018, the Company completed its minority stock offering, after receiving all regulatory approvals with trading commencing on the Nasdaq Global Select Market on April 20, 2018. In connection with the closing, the Company issued 62,580,155 shares of its common stock to the MHC, the Company's mutual holding company, 3,476,675 shares to the Columbia Bank Foundation, the Bank's charitable foundation, and 49,832,345 shares to depositors of the Bank who subscribed for and were allocated shares in the minority stock offering, as well as the Columbia Bank Employee Stock Ownership Plan.

XML

Recent Accounting Pronouncements (Policies)

6 Months Ended

Mar. 31, 2018

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Recent Accounting Pronouncement Adopted and Issued

In February 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update ("ASU") No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220). The updated guidance allows a reclassification from accumulated other comprehensive income to retained earnings for the stranded tax effects resulting from the Tax Cuts and Jobs Act disclosed in Note 9. The purpose of the guidance is to improve the usefulness of the information reported to the financial statement users. The guidance is effective for all entities for fiscal years beginning after December 31, 2018 and interim periods within those fiscal years. Early adoption is permitted. The Company early adopted ASU No. 2018-02 for the period ended December 31, 2017 and the impact of the adoption resulted in a reclassification adjustment between accumulated other comprehensive income and retained earnings of $11.7 million.

As an “emerging growth company” as defined in Title 1 of the Jumpstart Our Business Startups (JOBS) Act, the Company has elected to use the extended transition period to delay the adoption of new or reissued accounting pronouncements applicable to public companies until such pronouncements are made applicable to private companies. As of March 31, 2018, there are no significant differences in the guidance comparability of the financial statements as a result of this extended transition period.

In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities (ASU 2017-12). The purpose of this updated guidance is to better align a company’s financial reporting for hedging activities with the economic objectives of those activities. The effective date for this guidance is fiscal years beginning after December 15, 2018, with early adoption, including adoption in an interim period, permitted. ASU 2017-12 requires a modified retrospective transition method in which the Company will recognize the cumulative effect of the change on the opening balance of each affected component of equity in the statement of financial position as of the date of adoption. The Company is currently evaluating the impact of the new guidance on the Company’s consolidated financial statements.

In March 2017, the FASB issued ASU No. 2017-08, “Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities.” This guidance shortens the amortization period for premiums on callable debt securities by requiring that premiums be amortized to the first (or earliest) call date instead of as an adjustment to the yield over the contractual life. This change more closely aligns the accounting with the economics of a callable debt security and the amortization period with expectations that already are included in market pricing on callable debt securities. This guidance does not change the accounting for discounts on callable debt securities, which will continue to be amortized to the maturity date. This guidance includes only instruments that are held at a premium and have explicit call features. It does not include instruments that contain prepayment features, such as mortgage backed securities; nor does it include call options that are contingent upon future events or in which the timing or amount to be paid is not fixed. The effective date for this guidance is fiscal years beginning after December 15, 2018, including interim periods within the reporting period, with early adoption permitted. Transition is on a modified retrospective basis with an adjustment to retained earnings as of the beginning of the period of adoption. If early adopted in an interim period, adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. The Company is currently evaluating the impact of the new guidance on the Company’s consolidated financial statements.

In March 2017, the FASB issued ASU No. 2017-07, "Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Post-retirement Benefit Cost", which requires that companies disaggregate the service cost component from other components of net benefit cost. This update calls for companies that offer post-retirement benefits to present the service cost, which is the amount an employer has to set aside each quarter or fiscal year to cover the benefits, in the same line item with other current employee compensation costs. Other components of net benefit cost will be presented in the income statement separately from service costs component and outside the subtotal of income from operations, if one is presented. This guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company is currently evaluating the impact of the new guidance on the Company’s consolidated financial statements and does not anticipate the new guidance to have a material impact.

In January 2017, the FASB issued ASU No. 2017-04, “Simplifying the Test for Goodwill Impairment.” The main objective of this guidance is to simplify the accounting for goodwill impairment by requiring that impairment charges be based upon the first step in the current two-step impairment test under Accounting Standards Codification (ASC) 350. Currently, if the fair value of a reporting unit is lower than its carrying amount (Step 1), an entity calculates any impairment charge by comparing the implied fair value of goodwill with its carrying amount (Step 2). The implied fair value of goodwill is calculated by deducting the fair value of all assets and liabilities of the reporting unit from the reporting unit’s fair value as determined in Step 1. To determine the implied fair value of goodwill, entities estimate the fair value of any unrecognized intangible assets and any corporate-level assets or liabilities that were included in the determination of the carrying amount and fair value of the reporting unit in Step 1. Under this guidance, if a reporting unit’s carrying amount exceeds its fair value, an entity will record an impairment charge based on that difference. The impairment charge will be limited to the amount of goodwill allocated to that reporting unit. This guidance eliminates the requirement to calculate a goodwill impairment charge using Step 2. This guidance does not change the guidance on completing Step 1 of the goodwill impairment test. Under this guidance, an entity will still be able to perform the current optional qualitative goodwill impairment assessment before determining whether to proceed to Step 1. The guidance will be applied prospectively and is effective for annual and interim impairment tests performed in periods beginning after December 15, 2019. Early adoption is permitted for annual and interim goodwill impairment testing dates after January 1, 2017. The Company is currently evaluating the impact of the new guidance on the Company’s consolidated financial statements.

In August 2016, the FASB issued ASU No. 2016-15, "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments," a new standard which addresses diversity in practice related to eight specific cash flow issues: debt prepayment or extinguishment costs, settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance policies (including bank-owned life insurance policies), distributions received from equity method investees, beneficial interests in securitization transactions and separately identifiable cash flows and application of the predominance principle. This guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Entities will apply the standard’s provisions using a retrospective transition method to each period presented. If it is impracticable to apply the amendments retrospectively for some of the issues, the amendments for those issues would be applied prospectively as of the earliest date practicable. The Company is currently evaluating the impact of the new guidance on the Company’s consolidated financial statements and does not anticipate the new guidance to have a material impact.

In June 2016, the FASB issued ASU No. 2016-13, “Measurement of Credit Losses on Financial Instruments”. This guidance provides financial statement users with more decision-useful information about expected credit losses on financial instruments by a reporting entity at each reporting date. The amendments of this guidance require financial assets measured at amortized cost to be presented at the net amount expected to be collected. The allowance for credit losses would represent a valuation account that would be deducted from the amortized cost basis of the financial asset(s) to present the net carrying value at the amount expected to be collected on the financial asset. The income statement would reflect the measurement of credit losses that have taken place during the period. The measurement of expected credit losses would be based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. An entity would be required to use judgment in determining the relevant information and estimation methods that are appropriate in its circumstances. The guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within that reporting period, early adoption is permitted. The Company is currently evaluating its existing systems and data to support the new standard as well as assessing the impact that the guidance will have on the Company's consolidated financial statements. The Company has formed a working group under the direction of the Chief Accounting Officer that is primarily comprised of individuals from finance, credit, risk management, and operations. The Company has been developing an implementation plan as well as considering the use of consultants to aid in the implementation.

In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842)”. This guidance requires all lessees to recognize a lease liability and a right-of-use asset, measured at the present value of future minimum lease payments, at the lease commencement date. Lessor accounting remains largely unchanged under the new guidance. The guidance is effective for fiscal years beginning after December 15, 2018, including interim reporting periods within that reporting period, early adoption is permitted. A modified retrospective approach must be applied for leases existing at, or entered into after, the beginning of the earliest comparative period present in the financial statements. The Company is currently evaluating the impact of the new guidance on its consolidated financial statements by reviewing its existing lease contracts and service contracts.

In January 2016, the FASB issued ASU No. 2016-01, “Recognition and Measurement of Financial Assets and Financial Liabilities”. This guidance requires an entity to: i) measure equity investments at fair value through net income, with certain exceptions; (ii) present in other comprehensive income the changes in instrument-specific credit risk for financial liabilities measured using the fair value option; (iii) present financial assets and financial liabilities by measurement category and form of financial asset; (iv) calculate the fair value of financial instruments for disclosure purposes based on an exit price and; (v) assess a valuation allowance on deferred tax assets related to unrealized losses on available-for-sale debt securities in combination with other deferred tax assets. This guidance provides an election to subsequently measure certain nonmarketable equity investments at cost less any impairment and adjusted for certain observable price changes. The guidance also requires a qualitative impairment assessment of such equity investments and amends certain fair value disclosure requirements. The guidance is effective for annual periods beginning after December 15, 2017. The Company is currently evaluating the impact of the new guidance on the Company’s consolidated financial statements by evaluating its revenue streams and contracts potentially affected by the guidance.

In May 2014, the FASB issued ASU No. 2014-09, "Revenue from Contracts with Customers." The objective of this amendment is to clarify the principles for recognizing revenue and to develop a common revenue standard for U.S. GAAP and IFRS. This update affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are in the scope of other standards. The guidance is effective for public business entities for financial statements issued for fiscal years beginning after December 15, 2017, and early adoption is permitted. Subsequently, the FASB issued the following standards related to ASU No. 2014-09: ASU No. 2016-08, “Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations;” ASU No. 2016-10, “Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing;” ASU No. 2016-11, “Revenue Recognition (Topic 605) and Derivatives and Hedging (Topic 815): Rescission of SEC Guidance Because of ASU No. 2014-09 and 2014-16 Pursuant to Staff Announcements at the March 3, 2016 EITF Meeting;” and ASU No. 2016-12, “Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients”. These amendments are intended to improve and clarify the implementation guidance of ASU No. 2014-09 and have the same effective date as the original guidance. The Company's revenue is primarily comprised of net interest income on interest earning assets and liabilities and non-interest income. The scope of guidance explicitly excludes net interest income as well as other revenues associated with financial assets and liabilities, including loans, leases, securities and derivatives. The Company is currently evaluating the impact of the new guidance on the Company’s consolidated financial statements and does not anticipate the new guidance to have a material impact.

In March 2017, the FASB issued ASU No. 2017-08, Receivables-Nonrefundable Fees and Other Costs (Subtopic 310- 20): Premium Amortization on Purchased Callable Debt Securities. The amendments require the premium to be amortized to the earliest call date. The Company adopted ASU No. 2017-08 beginning October 1, 2017 and the impact was immaterial to the Company's financial statements.

XML

Investment Securities (Tables)

6 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Schedule of amortized cost, gross unrealized gains, gross unrealized losses and the fair value of securities available-for-sale

The following tables present the amortized cost, gross unrealized gains, gross unrealized losses and the fair value for securities available-for-sale at March 31, 2018 and September 30, 2017:

	March 31, 2018
	Amortized cost		Gross unrealized gains	Gross unrealized (losses)		Fair value
			(In thousands)
U.S. government and agency obligations	$	54,799	26	(928	)	$	53,897
Mortgage-backed securities and collateralized mortgage obligations	754,862		406	(20,069	)	735,199
Municipal obligations	1,295		—	—		1,295
Corporate debt securities	54,490		270	(748	)	54,012
Trust preferred securities	5,000		—	(348	)	4,652
Equity securities	2,328		830	—		3,158
	$	872,774	1,532	(22,093	)	$	852,213

	September 30, 2017
	Amortized cost		Gross unrealized gains	Gross unrealized (losses)		Fair value
			(In thousands)
U.S. government and agency obligations	$	24,954	35	(116	)	$	24,873
Mortgage-backed securities and collateralized mortgage obligations	479,927		652	(7,088	)	473,491
Municipal obligations	1,357		—	—		1,357
Corporate debt securities	49,489		536	(532	)	49,493
Trust preferred securities	5,000		—	(292	)	4,708
Equity securities	2,482		826	(54	)	3,254
	$	563,209	2,049	(8,082	)	$	557,176

Schedule of securities by contractual maturity

The table below presents the amortized cost and fair value of debt securities held-to-maturity at March 31, 2018 by contractual maturity. Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer.

	March 31, 2018
	Amortized cost		Fair value
	(In Thousands)
More than five years to ten years	$	13,402	$	13,159
	13,402		13,159
Mortgage-backed securities and collateralized mortgage obligations	240,729		232,318
	$	254,131	$	245,477

The table below presents the amortized cost and fair value of debt securities available-for-sale at March 31, 2018 by contractual maturity excluding equity securities. Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer.

	March 31, 2018
	Amortized cost		Fair value
	(In thousands)
One year or less	$	1,104	$	1,105
More than one year to five years	45,121		44,385
More than five years to ten years	59,359		59,204
More than ten years	10,000		9,162
	$	115,584	$	113,856
Mortgage-backed securities and collateralized mortgage obligations	754,862		735,199
	$	870,446	$	849,055

Schedule of available-for-sale securities reported in a continuous unrealized loss position

The following tables summarize the fair value and gross unrealized losses of those securities that reported an unrealized loss at March 31, 2018 and September 30, 2017 and if the unrealized loss position was continuous for the twelve months prior to March 31, 2018 and September 30, 2017:

	March 31, 2018
	Less than 12 months				12 months or longer			Total
	Fair Value		Gross unrealized (losses)		Fair value	Gross unrealized (losses)		Fair value	Gross unrealized (losses)
	(In thousands)
U.S. government and agency obligations	$	44,092	(722	)	4,774	(206	)	48,866	$	(928	)
Mortgage-backed securities and collateralized mortgage obligations	485,994		(11,572	)	156,550	(8,497	)	642,544	(20,069		)
Corporate debt securities	14,894		(98	)	9,351	(650	)	24,245	(748		)
Trust preferred securities	4,652		(348	)	—	—		4,652	(348		)
	$	549,632	(12,740	)	170,675	(9,353	)	720,307	$	(22,093	)

	September 30, 2017
	Less than 12 months				12 months or longer			Total
	Fair Value		Gross unrealized (losses)		Fair value	Gross unrealized (losses)		Fair value	Gross unrealized (losses)
	(In thousands)
U.S. government and agency obligations	$	14,831	(116	)	—	—		14,831	$	(116	)
Mortgage-backed securities and collateralized mortgage obligations	329,554		(5,346	)	49,695	(1,742	)	379,249	(7,088		)
Corporate debt securities	9,824		(176	)	9,644	(356	)	19,468	(532		)
Trust preferred securities	—		—		4,708	(292	)	4,708	(292		)
Equity securities	98		(54	)	—	—		98	(54		)
	$	354,307	(5,692	)	64,047	(2,390	)	418,354	$	(8,082	)

Schedule of amortized cost, gross unrealized gains, gross unrealized losses and the fair value of securities held-to-maturity

The following tables present the amortized cost, gross unrealized gains, gross unrealized losses and the fair value for securities held-to-maturity at March 31, 2018 and September 30, 2017:

	March 31, 2018
	Amortized cost		Gross unrealized gains	Gross unrealized (losses)		Fair value
	(In thousands)
U.S. government and agency obligations	$	13,402	—	(243	)	$	13,159
Mortgage-backed securities and collateralized mortgage obligations	240,729		530	(8,941	)	232,318
	$	254,131	530	(9,184	)	$	245,477

	September 30, 2017
	Amortized cost		Gross unrealized gains	Gross unrealized (losses)		Fair value
	(In thousands)
U.S. government and agency obligations	$	3,407	—	(7	)	$	3,400
Mortgage-backed securities and collateralized mortgage obligations	129,532		—	(1,110	)	128,422
	$	132,939	—	(1,117	)	$	131,822

Schedule of held-to-maturity securities reported in a continuous unrealized loss position

The following tables summarize the fair value and gross unrealized losses of those securities that reported an unrealized loss at March 31, 2018 and September 30, 2017 and if the unrealized loss position was continuous for the twelve months prior to March 31, 2018 and September 30, 2017:

	March 31, 2018
	Less than 12 months				12 months or longer			Total
	Fair Value		Gross unrealized (losses)		Fair value	Gross unrealized (losses)		Fair value	Gross unrealized (losses)
	(In thousands)
U.S. government and agency obligations	$	8,160	(243	)	—	—		8,160	$	(243	)
Mortgage-backed securities and collateralized mortgage obligations	139,886		(4,300	)	69,110	(4,641	)	208,996	(8,941		)
	$	148,046	(4,543	)	69,110	(4,641	)	217,156	$	(9,184	)

	September 30, 2017
	Less than 12 months				12 months or longer			Total
	Fair Value		Gross unrealized (losses)		Fair value	Gross unrealized (losses)		Fair value	Gross unrealized (losses)
	(In thousands)
U.S. government and agency obligations	$	—	—		3,400	(7	)	3,400	$	(7	)
Mortgage-backed securities and collateralized mortgage obligations	29,965		(349	)	96,076	(761	)	126,041	(1,110		)
	$	29,965	(349	)	99,476	(768	)	129,441	$	(1,117	)

XML

Loans Receivable and Allowance for Loan Losses (Tables)

6 Months Ended

Mar. 31, 2018

Receivables [Abstract]

Schedule of loans receivable

Loans receivable at March 31, 2018 and September 30, 2017 are summarized as follows:

	March 31,			September 30,
	2018			2017
	(In thousands)
Real estate loans:
One-to-four family	$	1,689,375		$	1,578,835
Multifamily and commercial	1,888,745			1,821,982
Construction	241,699			218,408
Commercial business loans	273,325			267,664
Consumer loans:
Home equity loans and advances	433,108			464,962
Other consumer loans	1,339			1,270
Total loans	4,527,591			4,353,121
Net deferred loan costs	12,280			9,135
Allowance for loan losses	(59,952		)	(54,633		)
Loans receivable, net	$	4,479,919		$	4,307,623

Schedule of aging of loans receivable by portfolio segment

The following tables summarize the aging of loans receivable by portfolio segment at March 31, 2018 and September 30, 2017:

	March 31, 2018
	30-59 days		60-89 days	Greater than 90 days	Total past due	Current	Total
	(In Thousands)
Real estate loans:
One to four family	$	5,201	1,706	2,565	9,472	1,679,903	$	1,689,375
Multifamily and commercial	504		—	118	622	1,888,123	1,888,745
Construction	—		—	—	—	241,699	241,699
Commercial business loans	355		—	407	762	272,563	273,325
Consumer loans:
Home equity loans advances	797		321	636	1,754	431,354	433,108
Other consumer loans	—		7	—	7	1,332	1,339
Total loans	$	6,857	2,034	3,726	12,617	4,514,974	$	4,527,591

	September 30, 2017
	30-59 days		60-89 days	Greater than 90 days	Total past due	Current	Total
	(In thousands)
Real estate loans:
One to four family	$	3,924	932	3,496	8,352	1,570,483	$	1,578,835
Multifamily and commercial	—		123	1,510	1,633	1,820,349	1,821,982
Construction	—		—	—	—	218,408	218,408
Commercial business loans	—		388	1,038	1,426	266,238	267,664
Consumer loans:
Home equity loans advances	1,437		187	351	1,975	462,987	464,962
Other consumer loans	1		—	—	1	1,269	1,270
Total loans	$	5,362	1,630	6,395	13,387	4,339,734	$	4,353,121

Schedule of loans receivable by portfolio segment and impairment method

The following table summarizes loans receivable and allowance for loan losses by portfolio segment and impairment method:

	March 31, 2018
	One to four family		Multifamily and commercial	Construction	Commercial Business	Home equity loans and advances	Other consumer	Unallocated	Total
	(In thousands)
Allowance for loan losses:
Individually evaluated for impairment	$	510	—	—	369	12	—	—	$	891
Collectively evaluated for impairment	18,318		19,097	6,574	10,431	3,912	7	722	59,061
Total	$	18,828	19,097	6,574	10,800	3,924	7	722	$	59,952
Total loans:
Individually evaluated for impairment	$	10,825	2,579	—	3,409	3,083	—	—	$	19,896
Collectively evaluated for impairment	1,678,550		1,886,166	241,699	269,916	430,025	1,339	—	4,507,695
Total	$	1,689,375	1,888,745	241,699	273,325	433,108	1,339	—	$	4,527,591

	September 30, 2017
	One to four family		Multifamily and commercial	Construction	Commercial Business	Home equity loans and advances	Other consumer	Unallocated	Total
	(In thousands)
Allowance for loan losses:
Individually evaluated for impairment	$	407	35	—	84	14	—	—	$	540
Collectively evaluated for impairment	18,126		17,994	5,299	8,396	4,176	8	94	54,093
Total	$	18,533	18,029	5,299	8,480	4,190	8	94	$	54,633
Total loans:
Individually evaluated for impairment	$	12,247	6,343	—	4,327	2,998	—	—	$	25,915
Collectively evaluated for impairment	1,566,588		1,815,639	218,408	263,337	461,964	1,270	—	4,327,206
Total	$	1,578,835	1,821,982	218,408	267,664	464,962	1,270	—	$	4,353,121

The activity in the allowance for loan losses by portfolio segment for the three and six months ended March 31, 2018 and 2017 was as follows:

	For the Three Months Ended March 31,
	One to four family			Multifamily and commercial		Construction		Commercial Business		Home equity loans and advances		Other consumer		Unallocated		Total
	(In Thousands)
2018
Balance at beginning of period	$	19,991		19,933		5,217		8,275		4,576		8		178		$	58,178
Provision charged (credited)	(1,229		)	(707	)	1,354		2,697		(657	)	(2	)	544		2,000
Recoveries	120			—		3		52		5		1		—		181
Charge-offs	(54		)	(129	)	—		(224	)	—		—		—		(407		)
Balance at end of period	$	18,828		19,097		6,574		10,800		3,924		7		722		$	59,952
2017
Balance at beginning of period	$	18,599		17,616		4,598		6,358		4,231		11		436		$	51,849
Provision charged (credited)	380			189		(345	)	579		(39	)	1		(390	)	375
Recoveries	22			—		—		77		7		—		—		106
Charge-offs	(183		)	(167	)	—		—		(70	)	(2	)	—		(422		)
Balance at end of period	$	18,818		17,638		4,253		7,014		4,129		10		46		$	51,908

	For the Six Months Ended March 31,
	One to four family			Multifamily and commercial		Construction		Commercial Business		Home equity loans and advances		Other consumer		Unallocated		Total
2018
Balance at beginning of period	$	18,533		18,029		5,299		8,480		4,190		8		94		$	54,633
Provision charged (credited)	245			1,199		1,272		2,322		(267	)	1		628		5,400
Recoveries	130			—		3		225		10		3		—		371
Charge-offs	(80		)	(131	)	—		(227	)	(9	)	(5	)	—		(452		)
Balance at end of period	$	18,828		19,097		6,574		10,800		3,924		7		722		$	59,952
2017
Balance at beginning of period	$	18,638		17,390		5,960		4,052		5,721		11		95		$	51,867
Provision charged (credited)	353			415		(1,707	)	2,889		(1,531	)	5		(49	)	375
Recoveries	26			—		—		96		13		—		—		135
Charge-offs	(199		)	(167	)	—		(23	)	(74	)	(6	)	—		(469		)
Balance at end of period	$	18,818		17,638		4,253		7,014		4,129		10		46		$	51,908

Schedule of troubled debt restructuring

The following tables present the number of loans modified as TDRs during the three and six months ended March 31, 2018 and 2017, along with their balances immediately prior to the modification date and post-modification. Post-modification recorded investment represents the net book balance immediately following modification.

	For the Three Months Ended
	March 31, 2018					March 31, 2017
	No. of Loans	Pre-modification recorded investment		Post-modification recorded investment		No. of Loans	Pre-modification recorded investment		Post-modification recorded investment
		(In thousands)					(In thousands)
Troubled Debt Restructurings
Real estate loans:
One to four family	1	$	588	$	588	1	$	83	$	83
Consumer loans:
Home equity loans and advances	1	84		84		—	—		—
Total loans	2	$	672	$	672	1	$	83	$	83

	For the Six Months Ended
	March 31, 2018					March 31, 2017
	No. of Loans	Pre-modification recorded investment		Post-modification recorded investment		No. of Loans	Pre-modification recorded investment		Post-modification recorded investment
		(In thousands)					(In thousands)
Troubled Debt Restructurings
Real estate loans:
One to four family	1	$	588	$	588	3	$	340	$	340
Home equity loans and advances	1	84		84		1	108		108
Total loans	2	$	672	$	672	4	$	448	$	448

Schedule of loans individually evaluated for impairment

The following table presents loans individually evaluated for impairment by loan segment:

	March 31, 2018
	Recorded investment		Unpaid principal balance		Specific allowance
	(In thousands)
With no allowance recorded:
Real estate loans:
One to four family	$	7,955	$	9,143	$	—
Multifamily and commercial	2,579		3,454		—
Commercial business loans	426		119		—
Consumer loans:
Home equity loans and advances	2,733		3,088		—
	13,693		15,804		—
With a specific allowance recorded:
Real estate loans:
One to four family	2,870		2,913		510
Commercial business loans	2,983		2,774		369
Consumer loans:
Home equity loans and advances	350		350		12
	6,203		6,037		891
Total:
Real estate loans:
One to four family	10,825		12,056		510
Multifamily and commercial	2,579		3,454		—
Commercial business loans	3,409		2,893		369
Consumer loans:
Home equity loans and advances	3,083		3,438		12
Total loans	$	19,896	$	21,841	$	891

	September 30, 2017
	Recorded investment		Unpaid principal balance		Specific allowance
	(In thousands)
With no allowance recorded:
Real estate loans:
One to four family	$	9,272	$	10,156	$	—
Multifamily and commercial	4,701		5,577		—
Commercial business loans	1,545		2,038		—
Consumer loans:
Home equity loans and advances	2,745		3,214		—
	18,263		20,985		—
With a specific allowance recorded:
Real estate loans:
One to four family	2,975		2,989		407
Multifamily and commercial	1,642		2,215		35
Commercial business loans	2,782		2,782		84
Consumer loans:
Home equity loans and advances
	253		253		14
Total:	7,652		8,239		540
Real estate loans:
One to four family	12,247		13,145		407
Multifamily and commercial	6,343		7,792		35
Commercial business loans	4,327		4,820		84
Consumer loans:
Home equity loans and advances	2,998		3,467		14
Total loans	$	25,915	$	29,224	$	540

The following table presents interest income recognized for loans individually evaluated for impairment by loan segment for the three and six months ended March 31, 2018 and 2017:

	For the Three Months Ended
	March 31, 2018				March 31, 2017
	Average recorded Investment		Interest Income Recognized		Average recorded Investment		Interest Income Recognized
	(In thousands)				(In thousands)
Real estate loans:
One to four family	$	11,235	$	102	$	16,061	$	142
Multifamily and commercial	3,136		26		3,825		14
Commercial business loans	3,836		26		3,797		26
Consumer loans:
Home equity loans and advances	2,837		36		4,122		35
Total loans	$	21,044	$	190	$	27,805	$	217

	For the Six Months Ended
	March 31, 2018				March 31, 2017
	Average recorded Investment		Interest Income Recognized		Average recorded Investment		Interest Income Recognized
	(In thousands)				(In thousands)
Real estate loans:
One to four family	$	11,572	$	212	$	16,747	$	260
Multifamily and commercial	4,205		65		5,665		84
Construction	—		—		168		—
Commercial business loans	4,000		72		4,036		75
Consumer loans:
Home equity loans and advances	2,891		71		3,897		69
Total loans	$	22,668	$	420	$	30,513	$	488

Schedule of loans receivable by credit quality risk

The following table presents loans receivable by credit quality risk indicator and by loan segment:

	March 31, 2018
	Real Estate
	One to four family		Multifamily and commercial	Construction	Commercial Business	Home equity loans and advances	Other consumer	Total
	(In thousands)
Pass	$	1,680,034	1,871,631	241,699	265,153	431,096	1,339	$	4,490,952
Special mention	—		3,764	—	3,619	—	—	7,383
Substandard	9,341		13,350	—	4,553	2,012	—	29,256
Doubtful	—		—	—	—	—	—	—
Total	$	1,689,375	1,888,745	241,699	273,325	433,108	1,339	$	4,527,591

	September 30, 2017
	Real Estate
	One to four family		Multifamily and commercial	Construction	Commercial Business	Home equity loans and advances	Other consumer	Total
	(In thousands)
Pass	$	1,569,064	1,796,786	218,408	258,454	463,257	1,270	$	4,307,239
Special mention	—		11,600	—	3,347	—	—	14,947
Substandard	9,771		13,596	—	5,863	1,705	—	30,935
Doubtful	—		—	—	—	—	—	—
Total	$	1,578,835	1,821,982	218,408	267,664	464,962	1,270	$	4,353,121

XML

Deposits (Tables)

6 Months Ended

Mar. 31, 2018

Banking and Thrift [Abstract]

Schedule of Deposits

Deposits at March 31, 2018 and September 30, 2017 are summarized as follows:

	March 31,		September 30,
	2018		2017
	(In Thousands)
Non-interest bearing transaction	$	709,684	$	676,067
Interest bearing transaction	1,411,361		1,268,833
Money market deposit accounts	358,818		273,605
Savings, including club deposits	1,490,173		546,449
Certificates of deposit	1,425,217		1,358,474
Total deposits	$	5,395,253	$	4,123,428

Schedule of Certificate Accounts by Maturity

A summary of certificate accounts by maturity at March 31, 2018 and September 30, 2017 are summarized as follows:

	March 31,		September 30,
	2018		2017
	(In Thousands)
Less than one year	$	693,173	$	657,741
More than one years to two years	492,169		338,265
More than two years to three years	160,472		248,779
More than three years to four years	59,663		81,959
More than four years	19,740		31,730
	$	1,425,217	$	1,358,474

XML

Components of Periodic Benefit Costs (Tables)

6 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

Net periodic benefit cost (income) for pension benefits and other benefits for the three and six months ended March 31, 2018 and 2017 includes the following components:

	For the Three Months Ended March 31,
	Pension						RIM				Post-retirement
	2018			2017			2018		2017		2018			2017
	(In thousands)
Service cost	$	1,780		$	1,905		$	61	$	59	$	93		$	118
Interest cost	2,129			2,111			111		107		205			186
Expected return on plan assets	(4,815		)	(6,202		)	—		—		—			—
Amortization:
Prior service cost	—			—			—		—		(34		)	(34		)
Net loss	707			2,750			103		113		69			81
Net periodic cost (income)	$	(199	)	$	564		$	275	$	279	$	333		$	351

	For the Six Months Ended March 31,
	Pension				RIM		Post-retirement
	2018		2017		2018	2017	2018		2017
	(In thousands)
Service cost	3,560		3,811		122	119	186		236
Interest cost	4,258		4,222		222	215	410		371
Expected return on plan assets	(9,630	)	(12,405	)	—	—	—		—
Amortization:
Prior service cost	—		—		—	—	(68	)	(68	)
Net loss	1,414		5,499		206	227	138		163
Net periodic cost (income)	(398	)	1,127		550	561	666		702

XML

Fair Value Measurements (Tables)

6 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Schedule of fair value assets and liabilities measured on recurring basis

The following tables present the assets and liabilities reported on the consolidated balance sheets at their fair values as of March 31, 2018 and September 30, 2017, by level within the fair value hierarchy:

	March 31, 2018
			Fair value measurements
	Fair value		Quoted prices in active markets for identical assets (Level 1)	Significant other observable inputs (Level 2)	Significant unobservable inputs (Level 3)
	(In thousands)
Measured on a recurring basis:
Securities available-for-sale:
U.S. government and agency obligations	$	53,897	53,897	—	$	—
Mortgage-backed securities and collateralized mortgage obligations	735,199		—	735,199	—
Municipal obligations	1,295		—	1,295	—
Corporate debt securities	54,012		—	54,012	—
Trust preferred securities	4,652		—	4,652	—
Equity securities	3,158		3,158	—	—
Total securities available-for-sale	$	852,213	57,055	795,158	$	—
Derivative assets	669		—	669	—
	$	852,882	57,055	795,827	$	—

	September 30, 2017
			Fair value measurements
	Fair value		Quoted prices in active markets for identical assets (Level 1)	Significant other observable inputs (Level 2)	Significant unobservable inputs (Level 3)
	(In thousands)
Measured on a recurring basis:
Securities available-for-sale:
U.S. government and agency obligations	$	24,873	24,873	—	$	—
Mortgage-backed securities and collateralized mortgage obligations	473,491		—	473,491	—
Municipal obligations	1,357		—	1,357	—
Corporate debt securities	49,493		—	49,493	—
Trust preferred securities	4,708		—	4,708	—
Equity securities	3,254		3,254	—	—
Total securities available-for-sale	557,176		28,127	529,049	—
Derivative assets	277		—	277	—
	$	557,453	28,127	529,326	$	—
Derivative liabilities	$	182	—	182	$	—

Schedule of fair value assets and liabilities measured on non-recurring basis

	March 31, 2018
			Fair value measurements
	Fair value		Quoted prices in active markets for identical assets (Level 1)	Significant other observable inputs (Level 2)	Significant unobservable inputs (Level 3)
	(In thousands)
Measured on a non-recurring basis:
Real estate owned	$	959	—	—	$	959
Loans measured for impairment based on the fair value of the underlying collateral	9,449		—	—	9,449
	$	10,408	—	—	$	10,408

	September 30, 2017
			Fair value measurements
	Fair value		Quoted prices in active markets for identical assets (Level 1)	Significant other observable inputs (Level 2)	Significant unobservable inputs (Level 3)
	(In thousands)
Measured on a non-recurring basis:
Real estate owned	$	393	—	—	$	393
Loans measured for impairment based on the fair value of the underlying collateral	14,156				14,156
	$	14,549	—	—	$	14,549

Schedule of qualitatie information for Level 3 assets measured at fair value on a non-recurring basis

The following table presents qualitative information for Level 3 assets measured at fair value on a non-recurring basis as of March 31, 2018 and September 30, 2017:

	March 31, 2018
	Fair value		Valuation methodology	Unobservable inputs	Range of inputs
	(In Thousands)
Real estate owned	$	959	Appraised Value	Discount for cost to sell	6.0%
Loans measured for impairment based on the fair value of the underlying collateral	$	9,449	Appraised Value	Discount for cost to sell	6.0% - 8.0%

	September 30, 2017
	Fair value		Valuation methodology	Unobservable inputs	Range of inputs
	(In Thousands)
Real estate owned	$	393	Appraised Value	Discount for cost to sell	6.0%
Loans measured for impairment based on the fair value of the underlying collateral	$	14,156	Appraised Value	Discount for cost to sell	6.0% - 8.0%

Schedule of fair value assets and liabilities on Consolidated Balance Sheets

The following tables present the assets and liabilities reported on the consolidated balance sheets at their fair values as of March 31, 2018 and September 30, 2017:

	March 31, 2018
			Fair Value Instruments
	Carrying Value		Total Fair Value	Quoted prices in active markets for identical assets (Level 1)	Significant other observable inputs (Level 2)	Significant unobservable inputs (Level 3)
	(In thousands)
Financial assets:
Cash and cash equivalents	$	634,381	634,381	634,381	—	$	—
Securities available-for-sale	852,213		852,213	57,055	795,158	—
Securities held-to-maturity	254,131		245,477	—	245,477	—
Federal Home Loan Bank stock	29,381		29,381	—	29,381	—
Loans receivable, net	4,479,919		4,390,761	—	—	4,390,761
Derivative assets	669		669	—	669	—
Financial liabilities:			—
Total deposits	$	5,395,253	5,382,310	—	5,382,310	$	—
Borrowings	589,430		532,051	—	532,051	—

	September 30, 2017
			Fair Value Instruments
	Carrying Value		Total Fair Value	Quoted prices in active markets for identical assets (Level 1)	Significant other observable inputs (Level 2)	Significant unobservable inputs (Level 3)
	(In thousands)
Financial assets:
Cash and cash equivalents	$	100,975	100,975	100,975	—	$	—
Securities available-for-sale	557,176		557,176	28,127	529,049	—
Securities held-to-maturity	132,939		131,822	—	131,822	—
Federal Home Loan Bank Stock	35,844		35,844	—	35,844	—
Loans receivable, net	4,307,623		4,301,138	—	—	4,301,138
Derivative assets	277		277	—	277	—
Financial liabilities:			—
Total deposits	$	4,123,428	3,880,363	—	3,880,363	$	—
Borrowings	733,043		732,731	—	732,731	—
Derivative liabilities	182		182	—	182	—

XML

Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Mar. 31, 2018

Equity [Abstract]

Schedule of Other Comprehensive Income (Loss)

The following tables present the components of other comprehensive income (loss), both gross and net of tax, for the three and six months ended March 31, 2018 and 2017:

	For the Three Months Ended
	March 31, 2018							March 31, 2017
	Before Tax			Tax Effect		After Tax		Before Tax		Tax Effect		After Tax
	(In thousands)
Components of Other Comprehensive (Loss) Income:
Unrealized gains and losses on securities available-for-sale:
Net losses arising during the period	$	(11,594	)	1,609		(9,985	)	651		(257	)	$	394
Accretion of unrealized loss on securities reclassified as held-to-maturity	(17		)	36		19		—		—		—
Reclassification adjustment for gains included in net income	116			(28	)	88		—		—		—
	(11,495		)	1,617		(9,878	)	651		(257	)	394
Unrealized gain on swap contract	382			(40	)	342		9		(3	)	6
	382			(40	)	342		9		(3	)	6
Employee benefit plans:
Amortization of prior service cost included in net income	(24		)	(19	)	(43	)	(28	)	10		(18		)
Reclassification adjustment of actuarial net (loss) gain included in net income	(8		)	(94	)	(102	)	7		(2	)	5
Change in funded status of retirement obligations	33			(301	)	(268	)	21		(156	)	(135		)
	1			(414	)	(413	)	—		(148	)	(148		)
Total other comprehensive (loss) income	$	(11,112	)	1,163		(9,949	)	660		(408	)	$	252

	For the Six Months Ended
	March 31, 2018							March 31, 2017
	Before Tax			Tax Effect		After Tax		Before Tax		Tax Effect		After Tax
	(In thousands)
Components of Other Comprehensive (Loss) Income:
Unrealized gains and losses on securities available-for-sale:
Net losses arising during the period	$	(14,584	)	1,454		(13,130	)	(23,012	)	8,197		$	(14,815	)
Accretion of unrealized loss on securities reclassified as held-to-maturity	(73		)	90		17		—		—		—
Reclassification adjustment for gains included in net income	55			(27	)	28		411		(144	)	267
	(14,602		)	1,517		(13,085	)	(22,601	)	8,053		(14,548		)
Unrealized loss on swap contract	669			(164	)	505		9		(4	)	5
	669			(164	)	505		9		(4	)	5
Employee benefit plans:
Amortization of prior service cost included in net income	(47		)	(38	)	(85	)	(57	)	20		(37		)
Reclassification adjustment of actuarial net loss included in net income	(18		)	(187	)	(205	)	15		(4	)	11
Change in funded status of retirement obligations	(10,664		)	4,788		(5,876	)	42		(25	)	17
Tax effects resulting from the adoption of ASU No. 2018-02	—			(10,434	)	(10,434	)	—		—		—
	(10,729		)	(5,871	)	(16,600	)	—		(9	)	(9		)
Total other comprehensive (loss)	$	(24,662	)	(4,518	)	(29,180	)	(22,592	)	8,040		$	(14,552	)

Components of Other Comprehensive Income (Loss)

The following tables present the changes in the components of accumulated other comprehensive (loss) income, net of tax, for the three and six months ended March 31, 2018 and 2017:

	For the Three Months Ended
	March 31, 2018								March 31, 2017
	Unrealized Gains on Securities Available-for- Sale			Swaps	Employee Benefit Plans		Accumulated Other Comprehensive Loss		Unrealized Gains on Securities Available-for-Sale		Swaps	Employee Benefit Plans		Accumulated Other Comprehensive Loss
	(In Thousands)								(In Thousands)
Balance at beginning of year	$	(7,345	)	224	(58,290	)	(65,411	)	(9,279	)	—	(56,883	)	$	(66,162	)
Current period changes in other comprehensive (loss) income	(9,878		)	342	(413	)	(9,949	)	394		6	(148	)	252
Total other comprehensive (loss) income	$	(17,223	)	566	(58,703	)	(75,360	)	(8,885	)	6	(57,031	)	$	(65,910	)

	For the Six Months Ended
	March 31, 2018								March 31, 2017
	Unrealized Gains on Securities Available-for-Sale			Swaps	Employee Benefit Plans		Accumulated Other Comprehensive Loss		Unrealized Gains on Securities Available-for-Sale		Swaps	Employee Benefit Plans		Accumulated Other Comprehensive Loss
	(In Thousands)								(In Thousands)
Balance at beginning of year	$	(4,075	)	—	(42,105	)	(46,180	)	5,664		—	(57,022	)	$	(51,358	)
Current period changes in other comprehensive (loss) income	(11,771		)	465	(6,166	)	(17,472	)	(14,548	)	5	(9	)	(14,552		)
Tax effects resulting from the adoption of ASU No. 2018-02	(1,314		)	40	(10,434	)	(11,708	)	—		—	—		—
Total other comprehensive (loss) income	$	(17,160	)	505	(58,705	)	(75,360	)	(8,884	)	5	(57,031	)	$	(65,910	)

Reclassification out of AOCI

The following table reflects amounts reclassified from accumulated other comprehensive (loss) income to the consolidated statement of income and the affected line item in the statement where net income is presented for the three and six months ended March 31, 2018 and 2017:

	For the Three Months Ended
	March 31, 2018			March 31, 2017
Accumulated other Comprehensive (Loss) Income Components							Affected line items in the Consolidated Statements of Income
Reclassification adjustment for gains included in net income	$	116		$	—		Gains on securities transactions, net
Reclassification adjustment of actuarial net (loss) gain included in net income	(8		)	7			Compensation and employee benefits expense
Total before tax	108			7
Income tax benefit	(122		)	(2		)
Net of tax	$	(14	)	$	5

	For the Six Months Ended
	March 31, 2018			March 31, 2017
Accumulated other Comprehensive (Loss) Income Components							Affected line items in the Consolidated Statements of Income
Reclassification adjustment for gains included in net income	$	55		$	411		Gains on securities transactions, net
Reclassification adjustment of actuarial net (loss) gain included in net income	(18		)	15			Compensation and employee benefits expense
Total before tax	37			426
Income tax benefit	(214		)	(148		)
Net of tax	$	(177	)	$	278

XML

Derivatives and Hedging Activities (Tables)

6 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of derivative financial instruments on the Consolidated Balance Sheets

The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the Consolidated Balance Sheets at March 31, 2018 and September 30, 2017:

	March 31, 2018
	Asset Derivative			Liability Derivative
	Consolidated Balance Sheet	Fair value		Consolidated Balance Sheet	Fair Value
		(In thousands)			(In thousands)
Derivatives:
Interest rate swap - cash flow hedge	Other Assets	$	669	Other Liabilities	$	—
Total derivative instruments		$	669		$	—
	September 30, 2017
	Asset Derivative			Liability Derivative
	Consolidated Balance Sheet	Fair value		Consolidated Balance Sheet	Fair Value
		(In thousands)			(In thousands)
Derivatives:
Interest rate swap - cash flow hedge	Other Assets	95		Other Liabilities	$	—
Currency forward contract - non-designated hedge	Other Assets	182		Other Liabilities	182
Total derivative instruments		$	277		$	182

XML

Plan of Stock Issuance - Narrative (Details) - USD ($) $ in Millions	Apr. 20, 2018	Sep. 27, 2017	Mar. 31, 2018
Class of Stock [Line Items]
Percentage of common stock to be contributed to an existing charitable foundation		3.00%
Total deferred costs			$ 1.7
Columbia Financial Inc | Minority Owners
Class of Stock [Line Items]
Sale of stock, percentage of ownership interest		43.00%
Columbia Financial Inc | Columbia Bank, MHC
Class of Stock [Line Items]
Sale of stock, percentage of ownership interest		54.00%
Subsequent event | Columbia Bank, MHC
Class of Stock [Line Items]
Shares issued (shares)	62,580,155
Subsequent event | Columbia Bank Foundation
Class of Stock [Line Items]
Shares issued (shares)	3,476,675
Employee Stock | Subsequent event
Class of Stock [Line Items]
Shares issued (shares)	49,832,345

XML

Recent Accounting Pronouncements - Narrative (Details) $ in Millions	6 Months Ended
	Mar. 31, 2018 USD ($)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification from AOCI to retaIned earnings due to TCJA	$ 11.7
Accumulated other comprehensive loss, net of tax
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification from AOCI to retaIned earnings due to TCJA	$ (11.7)

XML

Investment Securities - Securities Available-for-Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 872,774	$ 563,209
Gross unrealized gains	1,532	2,049
Gross unrealized (losses)	(22,093)	(8,082)
Securities available-for-sale, at fair value	852,213	557,176
U.S. government and agency obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	54,799	24,954
Gross unrealized gains	26	35
Gross unrealized (losses)	(928)	(116)
Securities available-for-sale, at fair value	53,897	24,873
Mortgage-backed securities and collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	754,862	479,927
Gross unrealized gains	406	652
Gross unrealized (losses)	(20,069)	(7,088)
Securities available-for-sale, at fair value	735,199	473,491
Municipal obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	1,295	1,357
Gross unrealized gains	0	0
Gross unrealized (losses)	0	0
Securities available-for-sale, at fair value	1,295	1,357
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	54,490	49,489
Gross unrealized gains	270	536
Gross unrealized (losses)	(748)	(532)
Securities available-for-sale, at fair value	54,012	49,493
Trust preferred securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	5,000	5,000
Gross unrealized gains	0	0
Gross unrealized (losses)	(348)	(292)
Securities available-for-sale, at fair value	4,652	4,708
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	2,328	2,482
Gross unrealized gains	830	826
Gross unrealized (losses)	0	(54)
Securities available-for-sale, at fair value	$ 3,158	$ 3,254

XML

Investment Securities - Expected Maturities of Available-for-Sale Securities (Details) $ in Thousands	Mar. 31, 2018 USD ($)
Amortized cost
Amortized cost	$ 870,446
Fair value
Fair value	849,055
Debt Securities excluding Mortgage-based securities and CMOs
Amortized cost
One year or less	1,104
More than one year to five years	45,121
More than five years to ten years	59,359
More than ten years	10,000
Amortized cost	115,584
Fair value
One year or less	1,105
More than one year to five years	44,385
More than five years to ten years	59,204
More than ten years	9,162
Fair value	113,856
Mortgage-backed securities and collateralized mortgage obligations
Amortized cost
Amortized cost	754,862
Fair value
Fair value	$ 735,199

XML

Investment Securities - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized cost of available-for-sale securities	$ 872,774,000		$ 872,774,000		$ 563,209,000
Securities	852,213,000		852,213,000		557,176,000
Proceeds from sales of securities available-for-sale	9,700,000		9,752,000	$ 57,350,000
Gross gains on sale of available-for-sale derivatives	116,000		116,000	500,000
Gross losses on sale of available-for-sale derivatives	0		61,000	89,000
Fair value of securities sold under agreements to repurchase	187,600,000		187,600,000		302,900,000
Other-than-temporary impairment charge on available-for-sale securities			0	0
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	254,131,000		254,131,000		132,939,000
Securities held-to-maturity, fair value	245,477,000		245,477,000		131,822,000
Proceeds from sale of held-to-maturity securities	0	$ 0	0	0
Other-than-temporary impairment charge on held-to-maturity securities			0	$ 0
Mortgage-backed securities and collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized cost of available-for-sale securities	754,862,000		754,862,000		479,927,000
Securities	735,199,000		735,199,000		473,491,000
Fair value of securities sold under agreements to repurchase	124,600,000		124,600,000		0
Mortgage-backed securities and collateralized mortgage obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	240,729,000		240,729,000		129,532,000
Securities held-to-maturity, fair value	$ 232,318,000		$ 232,318,000		$ 128,422,000

XML

Investment Securities - Continuous Unrealized Loss Position of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Securities available for sale:
Less than 12 months, Fair Value	$ 549,632	$ 354,307
Less than 12 months, Gross unrealized (losses)	(12,740)	(5,692)
12 months or longer, Fair value	170,675	64,047
12 months or longer, Gross unrealized (losses)	(9,353)	(2,390)
Total, Fair value	720,307	418,354
Total, Gross unrealized (losses)	(22,093)	(8,082)
U.S. government and agency obligations
Securities available for sale:
Less than 12 months, Fair Value	44,092	14,831
Less than 12 months, Gross unrealized (losses)	(722)	(116)
12 months or longer, Fair value	4,774	0
12 months or longer, Gross unrealized (losses)	(206)	0
Total, Fair value	48,866	14,831
Total, Gross unrealized (losses)	(928)	(116)
Mortgage-backed securities and collateralized mortgage obligations
Securities available for sale:
Less than 12 months, Fair Value	485,994	329,554
Less than 12 months, Gross unrealized (losses)	(11,572)	(5,346)
12 months or longer, Fair value	156,550	49,695
12 months or longer, Gross unrealized (losses)	(8,497)	(1,742)
Total, Fair value	642,544	379,249
Total, Gross unrealized (losses)	(20,069)	(7,088)
Corporate debt securities
Securities available for sale:
Less than 12 months, Fair Value	14,894	9,824
Less than 12 months, Gross unrealized (losses)	(98)	(176)
12 months or longer, Fair value	9,351	9,644
12 months or longer, Gross unrealized (losses)	(650)	(356)
Total, Fair value	24,245	19,468
Total, Gross unrealized (losses)	(748)	(532)
Trust preferred securities
Securities available for sale:
Less than 12 months, Fair Value	4,652	0
Less than 12 months, Gross unrealized (losses)	(348)	0
12 months or longer, Fair value	0	4,708
12 months or longer, Gross unrealized (losses)	0	(292)
Total, Fair value	4,652	4,708
Total, Gross unrealized (losses)	$ (348)	(292)
Equity securities
Securities available for sale:
Less than 12 months, Fair Value		98
Less than 12 months, Gross unrealized (losses)		(54)
12 months or longer, Fair value		0
12 months or longer, Gross unrealized (losses)		0
Total, Fair value		98
Total, Gross unrealized (losses)		$ (54)

XML

Investment Securities - Securities Held-to-Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 254,131	$ 132,939
Gross unrealized gains	530	0
Gross unrealized (losses)	(9,184)	(1,117)
Fair value	245,477	131,822
U.S. government and agency obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	13,402	3,407
Gross unrealized gains	0	0
Gross unrealized (losses)	(243)	(7)
Fair value	13,159	3,400
Mortgage-backed securities and collateralized mortgage obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	240,729	129,532
Gross unrealized gains	530	0
Gross unrealized (losses)	(8,941)	(1,110)
Fair value	$ 232,318	$ 128,422

XML

Investment Securities - Expected Maturities of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Amortized cost
Amortized cost	$ 254,131	$ 132,939
Fair value
Fair value	245,477	131,822
U.S. government and agency obligations
Amortized cost
More than five years to ten years	13,402
Amortized cost	13,402	3,407
Fair value
More than five years to ten years	13,159
Fair value	13,159	3,400
Mortgage-backed securities and collateralized mortgage obligations
Amortized cost
Amortized cost	240,729	129,532
Fair value
Fair value	$ 232,318	$ 128,422

XML

Investment Securities - Continuous Unrealized Loss Position of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Investment securities held-to-maturity:
Less than 12 months, Fair Value	$ 148,046	$ 29,965
Less than 12 months, Gross unrealized (losses)	(4,543)	(349)
12 months or longer, Fair value	69,110	99,476
12 months or longer, Gross unrealized (losses)	(4,641)	(768)
Total, Fair value	217,156	129,441
Total, Gross unrealized (losses)	(9,184)	(1,117)
U.S. government and agency obligations
Investment securities held-to-maturity:
Less than 12 months, Fair Value	8,160	0
Less than 12 months, Gross unrealized (losses)	(243)	0
12 months or longer, Fair value	0	3,400
12 months or longer, Gross unrealized (losses)	0	(7)
Total, Fair value	8,160	3,400
Total, Gross unrealized (losses)	(243)	(7)
Mortgage-backed securities and collateralized mortgage obligations
Investment securities held-to-maturity:
Less than 12 months, Fair Value	139,886	29,965
Less than 12 months, Gross unrealized (losses)	(4,300)	(349)
12 months or longer, Fair value	69,110	96,076
12 months or longer, Gross unrealized (losses)	(4,641)	(761)
Total, Fair value	208,996	126,041
Total, Gross unrealized (losses)	$ (8,941)	$ (1,110)

XML

Loans Receivable and Allowance for Loan Losses - Loans Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 4,527,591		$ 4,353,121
Net deferred loan costs	12,280		9,135
Allowance for loan losses	(59,952)	$ (58,178)	(54,633)	$ (51,908)	$ (51,849)	$ (51,867)
Loans receivable, net	4,479,919		4,307,623
Real estate loans | One-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,689,375		1,578,835
Allowance for loan losses	(18,828)	(19,991)	(18,533)	(18,818)	(18,599)	(18,638)
Real estate loans | Multifamily and commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,888,745		1,821,982
Allowance for loan losses	(19,097)	(19,933)	(18,029)	(17,638)	(17,616)	(17,390)
Real estate loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	241,699		218,408
Allowance for loan losses	(6,574)	(5,217)	(5,299)	(4,253)	(4,598)	(5,960)
Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	273,325		267,664
Allowance for loan losses	(10,800)	(8,275)	(8,480)	(7,014)	(6,358)	(4,052)
Consumer loans | Home equity loans and advances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	433,108		464,962
Allowance for loan losses	(3,924)	(4,576)	(4,190)	(4,129)	(4,231)	(5,721)
Consumer loans | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,339		1,270
Allowance for loan losses	$ (7)	$ (8)	$ (8)	$ (10)	$ (11)	$ (11)

XML

Loans Receivable and Allowance for Loan Losses - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases of loans receivable			$ 60,810	$ 16,772
Specific allowance for loan losses attributable to impaired loans	$ 891		891		$ 540
Impaired loans for which there are no related allowance for loan losses	13,693		13,693		18,263
Real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value of servicing liability	464,300		464,300		493,200
Real estate loans | Multifamily and commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases of loans receivable	2,100		51,900
Specific allowance for loan losses attributable to impaired loans	0		0		35
Impaired loans for which there are no related allowance for loan losses	2,579		2,579		4,701
Real estate loans | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases of loans receivable	2,700	$ 7,400	8,900	$ 16,800
Specific allowance for loan losses attributable to impaired loans	510		510		407
Impaired loans for which there are no related allowance for loan losses	$ 7,955		$ 7,955		$ 9,272

XML

Loans Receivable and Allowance for Loan Losses - Aging of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 12,617	$ 13,387
Current	4,514,974	4,339,734
Total	4,527,591	4,353,121
30-59 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	6,857	5,362
60-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,034	1,630
Greater than 90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	3,726	6,395
Real estate loans | One-to-four family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	9,472	8,352
Current	1,679,903	1,570,483
Total	1,689,375	1,578,835
Real estate loans | One-to-four family | 30-59 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	5,201	3,924
Real estate loans | One-to-four family | 60-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,706	932
Real estate loans | One-to-four family | Greater than 90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,565	3,496
Real estate loans | Multifamily and commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	622	1,633
Current	1,888,123	1,820,349
Total	1,888,745	1,821,982
Real estate loans | Multifamily and commercial | 30-59 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	504	0
Real estate loans | Multifamily and commercial | 60-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	123
Real estate loans | Multifamily and commercial | Greater than 90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	118	1,510
Real estate loans | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Current	241,699	218,408
Total	241,699	218,408
Real estate loans | Construction | 30-59 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Real estate loans | Construction | 60-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Real estate loans | Construction | Greater than 90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Commercial business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	762	1,426
Current	272,563	266,238
Total	273,325	267,664
Commercial business loans | 30-59 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	355	0
Commercial business loans | 60-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	388
Commercial business loans | Greater than 90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	407	1,038
Consumer loans | Home equity loans and advances
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,754	1,975
Current	431,354	462,987
Total	433,108	464,962
Consumer loans | Home equity loans and advances | 30-59 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	797	1,437
Consumer loans | Home equity loans and advances | 60-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	321	187
Consumer loans | Home equity loans and advances | Greater than 90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	636	351
Consumer loans | Other consumer loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	7	1
Current	1,332	1,269
Total	1,339	1,270
Consumer loans | Other consumer loans | 30-59 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	1
Consumer loans | Other consumer loans | 60-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	7	0
Consumer loans | Other consumer loans | Greater than 90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 0	$ 0

XML

Loans Receivable and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016
Allowance for loan losses:
Allowance for loan losses, Individually evaluated for impairment	$ 891		$ 540
Allowance for loan losses, Collectively evaluated for impairment	59,061		54,093
Total	59,952	$ 58,178	54,633	$ 51,908	$ 51,849	$ 51,867
Total loans:
Total loans, Individually evaluated for impairment	19,896		25,915
Total loans, Collectively evaluated for impairment	4,507,695		4,327,206
Total	4,527,591		4,353,121
Real estate loans | One-to-four family
Allowance for loan losses:
Allowance for loan losses, Individually evaluated for impairment	510		407
Allowance for loan losses, Collectively evaluated for impairment	18,318		18,126
Total	18,828	19,991	18,533	18,818	18,599	18,638
Total loans:
Total loans, Individually evaluated for impairment	10,825		12,247
Total loans, Collectively evaluated for impairment	1,678,550		1,566,588
Total	1,689,375		1,578,835
Real estate loans | Multifamily and commercial
Allowance for loan losses:
Allowance for loan losses, Individually evaluated for impairment	0		35
Allowance for loan losses, Collectively evaluated for impairment	19,097		17,994
Total	19,097	19,933	18,029	17,638	17,616	17,390
Total loans:
Total loans, Individually evaluated for impairment	2,579		6,343
Total loans, Collectively evaluated for impairment	1,886,166		1,815,639
Total	1,888,745		1,821,982
Real estate loans | Construction
Allowance for loan losses:
Allowance for loan losses, Individually evaluated for impairment	0		0
Allowance for loan losses, Collectively evaluated for impairment	6,574		5,299
Total	6,574	5,217	5,299	4,253	4,598	5,960
Total loans:
Total loans, Individually evaluated for impairment	0		0
Total loans, Collectively evaluated for impairment	241,699		218,408
Total	241,699		218,408
Commercial business loans
Allowance for loan losses:
Allowance for loan losses, Individually evaluated for impairment	369		84
Allowance for loan losses, Collectively evaluated for impairment	10,431		8,396
Total	10,800	8,275	8,480	7,014	6,358	4,052
Total loans:
Total loans, Individually evaluated for impairment	3,409		4,327
Total loans, Collectively evaluated for impairment	269,916		263,337
Total	273,325		267,664
Consumer loans | Home equity loans and advances
Allowance for loan losses:
Allowance for loan losses, Individually evaluated for impairment	12		14
Allowance for loan losses, Collectively evaluated for impairment	3,912		4,176
Total	3,924	4,576	4,190	4,129	4,231	5,721
Total loans:
Total loans, Individually evaluated for impairment	3,083		2,998
Total loans, Collectively evaluated for impairment	430,025		461,964
Total	433,108		464,962
Consumer loans | Other consumer loans
Allowance for loan losses:
Allowance for loan losses, Individually evaluated for impairment	0		0
Allowance for loan losses, Collectively evaluated for impairment	7		8
Total	7	8	8	10	11	11
Total loans:
Total loans, Individually evaluated for impairment	0		0
Total loans, Collectively evaluated for impairment	1,339		1,270
Total	1,339		1,270
Unallocated
Allowance for loan losses:
Allowance for loan losses, Individually evaluated for impairment	0		0
Allowance for loan losses, Collectively evaluated for impairment	722		94
Total	722	$ 178	94	$ 46	$ 436	$ 95
Total loans:
Total loans, Individually evaluated for impairment	0		0
Total loans, Collectively evaluated for impairment	0		0
Total	$ 0		$ 0

XML

Loans Receivable and Allowance for Loan Losses - Troubled Debt Restructuring (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018 USD ($) loan	Mar. 31, 2017 USD ($) loan	Mar. 31, 2018 USD ($) loan	Mar. 31, 2017 USD ($) loan
Financing Receivable, Modifications [Line Items]
No. of Loans | loan	2,000	1,000	2,000	4,000
Pre-modification recorded investment	$ 672	$ 83	$ 672	$ 448
Post-modification recorded investment	$ 672	$ 83	$ 672	$ 448
Real estate loans | One-to-four family
Financing Receivable, Modifications [Line Items]
No. of Loans | loan	1,000	1,000	1,000	3,000
Pre-modification recorded investment	$ 588	$ 83	$ 588	$ 340
Post-modification recorded investment	$ 588	$ 83	$ 588	$ 340
Real estate loans | Home equity loans and advances
Financing Receivable, Modifications [Line Items]
No. of Loans | loan			1,000	1,000
Pre-modification recorded investment			$ 84	$ 108
Post-modification recorded investment			$ 84	$ 108
Consumer loans | Home equity loans and advances
Financing Receivable, Modifications [Line Items]
No. of Loans | loan	1,000	0
Pre-modification recorded investment	$ 84	$ 0
Post-modification recorded investment	$ 84	$ 0

XML

Loans Receivable and Allowance for Loan Losses - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Allowance for loan losses:
Beginning balance	$ 58,178	$ 51,849	$ 54,633	$ 51,867
Provision for loan losses	2,000	375	5,400	375
Recoveries	181	106	371	135
Charge-offs	(407)	(422)	(452)	(469)
Ending balance	59,952	51,908	59,952	51,908
Real estate loans | One-to-four family
Allowance for loan losses:
Beginning balance	19,991	18,599	18,533	18,638
Provision for loan losses	(1,229)	380	245	353
Recoveries	120	22	130	26
Charge-offs	(54)	(183)	(80)	(199)
Ending balance	18,828	18,818	18,828	18,818
Real estate loans | Multifamily and commercial
Allowance for loan losses:
Beginning balance	19,933	17,616	18,029	17,390
Provision for loan losses	(707)	189	1,199	415
Recoveries	0	0	0	0
Charge-offs	(129)	(167)	(131)	(167)
Ending balance	19,097	17,638	19,097	17,638
Real estate loans | Construction
Allowance for loan losses:
Beginning balance	5,217	4,598	5,299	5,960
Provision for loan losses	1,354	(345)	1,272	(1,707)
Recoveries	3	0	3	0
Charge-offs	0	0	0	0
Ending balance	6,574	4,253	6,574	4,253
Commercial business loans
Allowance for loan losses:
Beginning balance	8,275	6,358	8,480	4,052
Provision for loan losses	2,697	579	2,322	2,889
Recoveries	52	77	225	96
Charge-offs	(224)	0	(227)	(23)
Ending balance	10,800	7,014	10,800	7,014
Consumer loans | Home equity loans and advances
Allowance for loan losses:
Beginning balance	4,576	4,231	4,190	5,721
Provision for loan losses	(657)	(39)	(267)	(1,531)
Recoveries	5	7	10	13
Charge-offs	0	(70)	(9)	(74)
Ending balance	3,924	4,129	3,924	4,129
Consumer loans | Other consumer loans
Allowance for loan losses:
Beginning balance	8	11	8	11
Provision for loan losses	(2)	1	1	5
Recoveries	1	0	3	0
Charge-offs	0	(2)	(5)	(6)
Ending balance	7	10	7	10
Unallocated
Allowance for loan losses:
Beginning balance	178	436	94	95
Provision for loan losses	544	(390)	628	(49)
Recoveries	0	0	0	0
Charge-offs	0	0	0	0
Ending balance	$ 722	$ 46	$ 722	$ 46

XML

Loans Receivable and Allowance for Loan Losses - Loans Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Financing Receivable, Impaired [Line Items]
With no allowance recorded: Recorded investment	$ 13,693	$ 18,263
With no allowance recorded: Unpaid principal balance	15,804	20,985
With a specific allowance recorded: Recorded investment	6,203	7,652
With a specific allowance recorded: Unpaid principal balance	6,037	8,239
Recorded investment	19,896	25,915
Unpaid principal balance	21,841	29,224
Specific allowance	891	540
Real estate loans | One-to-four family
Financing Receivable, Impaired [Line Items]
With no allowance recorded: Recorded investment	7,955	9,272
With no allowance recorded: Unpaid principal balance	9,143	10,156
With a specific allowance recorded: Recorded investment	2,870	2,975
With a specific allowance recorded: Unpaid principal balance	2,913	2,989
Recorded investment	10,825	12,247
Unpaid principal balance	12,056	13,145
Specific allowance	510	407
Real estate loans | Multifamily and commercial
Financing Receivable, Impaired [Line Items]
With no allowance recorded: Recorded investment	2,579	4,701
With no allowance recorded: Unpaid principal balance	3,454	5,577
With a specific allowance recorded: Recorded investment		1,642
With a specific allowance recorded: Unpaid principal balance		2,215
Recorded investment	2,579	6,343
Unpaid principal balance	3,454	7,792
Specific allowance	0	35
Commercial business loans
Financing Receivable, Impaired [Line Items]
With no allowance recorded: Recorded investment	426	1,545
With no allowance recorded: Unpaid principal balance	119	2,038
With a specific allowance recorded: Recorded investment	2,983	2,782
With a specific allowance recorded: Unpaid principal balance	2,774	2,782
Recorded investment	3,409	4,327
Unpaid principal balance	2,893	4,820
Specific allowance	369	84
Consumer loans | Home equity loans and advances
Financing Receivable, Impaired [Line Items]
With no allowance recorded: Recorded investment	2,733	2,745
With no allowance recorded: Unpaid principal balance	3,088	3,214
With a specific allowance recorded: Recorded investment	350	253
With a specific allowance recorded: Unpaid principal balance	350	253
Recorded investment	3,083	2,998
Unpaid principal balance	3,438	3,467
Specific allowance	$ 12	$ 14

XML

Loans Receivable and Allowance for Loan Losses - Interest Income on Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Financing Receivable, Impaired [Line Items]
Average recorded Investment	$ 21,044	$ 27,805	$ 22,668	$ 30,513
Interest Income Recognized	190	217	420	488
Real estate loans | One-to-four family
Financing Receivable, Impaired [Line Items]
Average recorded Investment	11,235	16,061	11,572	16,747
Interest Income Recognized	102	142	212	260
Real estate loans | Multifamily and commercial
Financing Receivable, Impaired [Line Items]
Average recorded Investment	3,136	3,825	4,205	5,665
Interest Income Recognized	26	14	65	84
Real estate loans | Construction
Financing Receivable, Impaired [Line Items]
Average recorded Investment			0	168
Interest Income Recognized			0	0
Commercial business loans
Financing Receivable, Impaired [Line Items]
Average recorded Investment	3,836	3,797	4,000	4,036
Interest Income Recognized	26	26	72	75
Consumer loans
Financing Receivable, Impaired [Line Items]
Average recorded Investment
Interest Income Recognized
Consumer loans | Home equity loans and advances
Financing Receivable, Impaired [Line Items]
Average recorded Investment	2,837	4,122	2,891	3,897
Interest Income Recognized	$ 36	$ 35	$ 71	$ 69

XML

Loans Receivable and Allowance for Loan Losses - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 4,527,591	$ 4,353,121
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,490,952	4,307,239
Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,383	14,947
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	29,256	30,935
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Real estate loans | One-to-four family
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,689,375	1,578,835
Real estate loans | One-to-four family | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,680,034	1,569,064
Real estate loans | One-to-four family | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Real estate loans | One-to-four family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	9,341	9,771
Real estate loans | One-to-four family | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Real estate loans | Multifamily and commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,888,745	1,821,982
Real estate loans | Multifamily and commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,871,631	1,796,786
Real estate loans | Multifamily and commercial | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,764	11,600
Real estate loans | Multifamily and commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	13,350	13,596
Real estate loans | Multifamily and commercial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Real estate loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	241,699	218,408
Real estate loans | Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	241,699	218,408
Real estate loans | Construction | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Real estate loans | Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Real estate loans | Construction | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial business loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	273,325	267,664
Commercial business loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	265,153	258,454
Commercial business loans | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,619	3,347
Commercial business loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,553	5,863
Commercial business loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Consumer loans | Home equity loans and advances
Financing Receivable, Recorded Investment [Line Items]
Total loans	433,108	464,962
Consumer loans | Home equity loans and advances | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	431,096	463,257
Consumer loans | Home equity loans and advances | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Consumer loans | Home equity loans and advances | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,012	1,705
Consumer loans | Home equity loans and advances | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Consumer loans | Other consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,339	1,270
Consumer loans | Other consumer loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,339	1,270
Consumer loans | Other consumer loans | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Consumer loans | Other consumer loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Consumer loans | Other consumer loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 0	$ 0

XML

Deposits - Schedule of Deposits (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Banking and Thrift [Abstract]
Non-interest bearing transaction	$ 709,684	$ 676,067
Interest bearing transaction	1,411,361	1,268,833
Money market deposit accounts	358,818	273,605
Savings, including club deposits	1,490,173	546,449
Certificates of deposit	1,425,217	1,358,474
Total deposits	$ 5,395,253	$ 4,123,428

XML

Deposits - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2018	Sep. 30, 2017
Banking and Thrift [Abstract]
Aggregate amount of certificates of deposit exceeding threshold amount	$ 656.8	$ 608.5

XML

Deposits - Schedule of Deposit Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Banking and Thrift [Abstract]
Less than one year	$ 693,173	$ 657,741
More than one years to two years	492,169	338,265
More than two years to three years	160,472	248,779
More than three years to four years	59,663	81,959
More than four years	19,740	31,730
Total term certificate accounts	$ 1,425,217	$ 1,358,474

XML

Components of Periodic Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1,780	$ 1,905	$ 3,560	$ 3,811
Interest cost	2,129	2,111	4,258	4,222
Expected return on plan assets	(4,815)	(6,202)	(9,630)	(12,405)
Amortization of Prior service cost	0	0	0	0
Amortization of Net loss	707	2,750	1,414	5,499
Net periodic cost (income)	(199)	564	(398)	1,127
RIM
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	61	59	122	119
Interest cost	111	107	222	215
Expected return on plan assets	0	0	0	0
Amortization of Prior service cost	0	0	0	0
Amortization of Net loss	103	113	206	227
Net periodic cost (income)	275	279	550	561
Post-retirement
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	93	118	186	236
Interest cost	205	186	410	371
Expected return on plan assets	0	0	0	0
Amortization of Prior service cost	(34)	(34)	(68)	(68)
Amortization of Net loss	69	81	138	163
Net periodic cost (income)	$ 333	$ 351	$ 666	$ 702

XML

Fair Value Measurements - Narrative (Details)	6 Months Ended
	Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated costs to sell foreclosed assets	6.00%
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjustments for estimated costs to sell collateral dependent impaired loans	6.00%
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjustments for estimated costs to sell collateral dependent impaired loans	8.00%

XML

Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	$ 852,213	$ 557,176
U.S. government and agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	53,897	24,873
Mortgage-backed securities and collateralized mortgage obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	735,199	473,491
Municipal obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	1,295	1,357
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	54,012	49,493
Trust preferred securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	4,652	4,708
Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	3,158	3,254
Quoted prices in active markets for identical assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale		28,127
Derivative assets	0	0
Derivative liabilities		0
Significant other observable inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale		529,049
Derivative assets	669	277
Derivative liabilities		182
Significant unobservable inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	0	0
Derivative assets	0	0
Derivative liabilities		0
Measured on recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	852,213	557,176
Derivative assets	669	277
Assets	852,882	557,453
Derivative liabilities		182
Measured on recurring basis | U.S. government and agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	53,897	24,873
Measured on recurring basis | Mortgage-backed securities and collateralized mortgage obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	735,199	473,491
Measured on recurring basis | Municipal obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	1,295	1,357
Measured on recurring basis | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	54,012	49,493
Measured on recurring basis | Trust preferred securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	4,652	4,708
Measured on recurring basis | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	3,158	3,254
Measured on recurring basis | Quoted prices in active markets for identical assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	57,055	28,127
Derivative assets	0	0
Assets	57,055	28,127
Derivative liabilities		0
Measured on recurring basis | Quoted prices in active markets for identical assets (Level 1) | U.S. government and agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	53,897	24,873
Measured on recurring basis | Quoted prices in active markets for identical assets (Level 1) | Mortgage-backed securities and collateralized mortgage obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	0	0
Measured on recurring basis | Quoted prices in active markets for identical assets (Level 1) | Municipal obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	0	0
Measured on recurring basis | Quoted prices in active markets for identical assets (Level 1) | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	0	0
Measured on recurring basis | Quoted prices in active markets for identical assets (Level 1) | Trust preferred securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	0	0
Measured on recurring basis | Quoted prices in active markets for identical assets (Level 1) | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	3,158	3,254
Measured on recurring basis | Significant other observable inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	795,158	529,049
Derivative assets	669	277
Assets	795,827	529,326
Derivative liabilities		182
Measured on recurring basis | Significant other observable inputs (Level 2) | U.S. government and agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	0	0
Measured on recurring basis | Significant other observable inputs (Level 2) | Mortgage-backed securities and collateralized mortgage obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	735,199	473,491
Measured on recurring basis | Significant other observable inputs (Level 2) | Municipal obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	1,295	1,357
Measured on recurring basis | Significant other observable inputs (Level 2) | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	54,012	49,493
Measured on recurring basis | Significant other observable inputs (Level 2) | Trust preferred securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	4,652	4,708
Measured on recurring basis | Significant other observable inputs (Level 2) | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	0	0
Measured on recurring basis | Significant unobservable inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	0	0
Derivative assets	0	0
Assets	0	0
Derivative liabilities		0
Measured on recurring basis | Significant unobservable inputs (Level 3) | U.S. government and agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	0	0
Measured on recurring basis | Significant unobservable inputs (Level 3) | Mortgage-backed securities and collateralized mortgage obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	0	0
Measured on recurring basis | Significant unobservable inputs (Level 3) | Municipal obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	0	0
Measured on recurring basis | Significant unobservable inputs (Level 3) | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	0	0
Measured on recurring basis | Significant unobservable inputs (Level 3) | Trust preferred securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	0	0
Measured on recurring basis | Significant unobservable inputs (Level 3) | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available-for-sale	$ 0	$ 0

XML

Fair Value Measurements - Assets and Liabilities Measured on Non-Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate owned	$ 959	$ 393
Quoted prices in active markets for identical assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans measured for impairment based on the fair value of the underlying collateral	0	0
Significant other observable inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans measured for impairment based on the fair value of the underlying collateral	0	0
Significant unobservable inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans measured for impairment based on the fair value of the underlying collateral	4,390,761	4,301,138
Measured on non-recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate owned	959	393
Loans measured for impairment based on the fair value of the underlying collateral	9,449	14,156
Assets	10,408	14,549
Measured on non-recurring basis | Quoted prices in active markets for identical assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate owned	0	0
Loans measured for impairment based on the fair value of the underlying collateral	0
Assets	0	0
Measured on non-recurring basis | Significant other observable inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate owned	0	0
Loans measured for impairment based on the fair value of the underlying collateral	0
Assets	0	0
Measured on non-recurring basis | Significant unobservable inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate owned	959	393
Loans measured for impairment based on the fair value of the underlying collateral	9,449	14,156
Assets	$ 10,408	$ 14,549

XML

Fair Value Measurements - Qualitative Valuation (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2018	Sep. 30, 2017
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Real estate owned	$ 959	$ 393
Real estate owned | Appraised Value
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount for cost to sell	6.00%	6.00%
Loans measured for impairment based on the fair value of the underlying collateral | Minimum | Appraised Value
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount for cost to sell	6.00%	6.00%
Loans measured for impairment based on the fair value of the underlying collateral | Maximum | Appraised Value
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount for cost to sell	8.00%	8.00%
Measured on non-recurring basis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Real estate owned	$ 959	$ 393
Loans measured for impairment based on the fair value of the underlying collateral	$ 9,449	$ 14,156

XML

Fair Value Measurements - Fair Value on Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Financial assets:
Securities available-for-sale, at fair value	$ 852,213	$ 557,176
Securities held-to-maturity	245,477	131,822
Quoted prices in active markets for identical assets (Level 1)
Financial assets:
Cash and cash equivalents	634,381	100,975
Securities available-for-sale, at fair value		28,127
Securities held-to-maturity	0	0
Federal Home Loan Bank stock	0	0
Loans receivable, net	0	0
Derivative assets	0	0
Financial liabilities:
Total deposits	0	0
Borrowings	0	0
Derivative liabilities		0
Significant other observable inputs (Level 2)
Financial assets:
Cash and cash equivalents	0	0
Securities available-for-sale, at fair value		529,049
Securities held-to-maturity		131,822
Federal Home Loan Bank stock	29,381	35,844
Loans receivable, net	0	0
Derivative assets	669	277
Financial liabilities:
Total deposits	5,382,310	3,880,363
Borrowings	532,051	732,731
Derivative liabilities		182
Significant unobservable inputs (Level 3)
Financial assets:
Cash and cash equivalents	0	0
Securities available-for-sale, at fair value	0	0
Securities held-to-maturity	0	0
Federal Home Loan Bank stock	0	0
Loans receivable, net	4,390,761	4,301,138
Derivative assets	0	0
Financial liabilities:
Total deposits	0	0
Borrowings	0	0
Derivative liabilities		0
Carrying Value
Financial assets:
Cash and cash equivalents	634,381	100,975
Securities available-for-sale, at fair value	852,213	557,176
Securities held-to-maturity	254,131	132,939
Federal Home Loan Bank stock	29,381	35,844
Loans receivable, net	4,479,919	4,307,623
Derivative assets	669	277
Financial liabilities:
Total deposits	5,395,253	4,123,428
Borrowings	589,430	733,043
Derivative liabilities		182
Total Fair Value
Financial assets:
Cash and cash equivalents	634,381	100,975
Securities available-for-sale, at fair value	852,213	557,176
Securities held-to-maturity	245,477	131,822
Federal Home Loan Bank stock	29,381	35,844
Loans receivable, net	4,390,761	4,301,138
Derivative assets	669	277
Financial liabilities:
Total deposits	5,382,310	3,880,363
Borrowings	$ 532,051	732,731
Derivative liabilities		$ 182

XML

Other Comprehensive Income (Loss) - Tax effects of components in other comprehensive income (loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Components of Other Comprehensive Income (Loss), Before Tax
Net losses arising during the period	$ (11,594)	$ 651	$ (14,584)	$ (23,012)
Accretion of unrealized loss on securities reclassified as held-to-maturity	(17)	0	(73)	0
Reclassification adjustment for gains included in net income	116	0	55	411
Total other comprehensive (loss) income, before tax	(11,495)	651	(14,602)	(22,601)
Unrealized gain (loss) on swap contract, before tax	382	9	669	9
Employee benefit plans, Before tax
Amortization of prior service cost included in net income	(24)	(28)	(47)	(57)
Reclassification adjustment of actuarial net (loss) gain included in net income	(8)	7	(18)	15
Change in funded status of retirement obligations	33	21	(10,664)	42
Tax effects resulting from the adoption of ASU No. 2018-02			0	0
Total employee benefit plans, before tax	1	0	(10,729)	0
Total other comprehensive (loss) income	(11,112)	660	(24,662)	(22,592)
Components of Other Comprehensive Income (Loss), Tax Effect
Net losses arising during the period	1,609	(257)	1,454	8,197
Accretion of unrealized loss on securities reclassified as held-to-maturity	36	0	90	0
Reclassification adjustment for gains included in net income	(28)	0	(27)	(144)
Total other comprehensive (loss) income, tax	1,617	(257)	1,517	8,053
Unrealized gain (loss) on swap contract, Tax	(40)	(3)	(164)	(4)
Employee benefit plans, Tax Effect
Amortization of prior service cost included in net income	(19)	10	(38)	20
Reclassification adjustment of actuarial net (loss) gain included in net income	(94)	(2)	(187)	(4)
Change in funded status of retirement obligations	(301)	(156)	4,788	(25)
Tax effects resulting from the adoption of ASU No. 2018-02			(10,434)	0
Total employee benefit plans, tax	(414)	(148)	(5,871)	(9)
Total other comprehensive (loss) income	1,163	(408)	(4,518)	8,040
Components of Other Comprehensive Income (Loss), After Tax
Net losses arising during the period	(9,985)	394	(13,130)	(14,815)
Accretion of unrealized gain on securities reclassified as held-to-maturity	19	0	17	0
Reclassification adjustment for gains included in net income	88	0	28	267
Total other comprehensive (loss) income, net of tax	(9,878)	394	(13,085)	(14,548)
Unrealized gain (loss) on swap contract, Net of tax	342	6	505	5
Employee benefit plans, After Tax
Amortization of prior service cost included in net income	(43)	(18)	(85)	(37)
Reclassification adjustment of actuarial net (loss) gain included in net income	(102)	5	(205)	11
Change in funded status of retirement obligations	(268)	(135)	(5,876)	17
Tax effects resulting from the adoption of ASU No. 2018-02	0	0	(10,434)	0
Total employee benefit plans, net of tax	(413)	(148)	(16,600)	(9)
Total other comprehensive (loss) income	$ (9,949)	$ 252	$ (29,180)	$ (14,552)

XML

Other Comprehensive Income (Loss) - Changes in components of other comprehensive income (loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of year			$ 475,914	$ 439,664
Current period changes in other comprehensive (loss) income	$ (9,949)	$ 252	(17,472)	(14,552)
Tax effects resulting from the adoption of ASU No. 2018-02			(11,708)	0
Balance at end of year	473,904	445,398	473,904	445,398
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of year	(65,411)	(66,162)	(46,180)	(51,358)
Balance at end of year	(75,360)	(65,910)	(75,360)	(65,910)
Total other comprehensive (loss) income	(75,360)		(75,360)
Unrealized Gains on Securities Available-for- Sale
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of year	(7,345)	(9,279)	(4,075)	5,664
Current period changes in other comprehensive (loss) income	(9,878)	394	(11,771)	(14,548)
Tax effects resulting from the adoption of ASU No. 2018-02			(1,314)	0
Balance at end of year	(17,223)	(8,885)	(17,223)	(8,885)
Total other comprehensive (loss) income	(17,160)	(8,884)	(17,160)	(8,884)
Swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of year	224	0	0	0
Current period changes in other comprehensive (loss) income	342	6	465	5
Tax effects resulting from the adoption of ASU No. 2018-02			40	0
Balance at end of year	566	6	566	6
Total other comprehensive (loss) income	505	5	505	5
Employee Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of year	(58,290)	(56,883)	(42,105)	(57,022)
Current period changes in other comprehensive (loss) income	(413)	(148)	(6,166)	(9)
Tax effects resulting from the adoption of ASU No. 2018-02			(10,434)	0
Balance at end of year	(58,703)	(57,031)	(58,703)	(57,031)
Total other comprehensive (loss) income	$ (58,705)	$ (57,031)	$ (58,705)	$ (57,031)

XML

Other Comprehensive Income (Loss) - Reclassification out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
(Loss) gain on securities transactions, net	$ 116	$ 0	$ 55	$ 411
Compensation and employee benefits expense	(16,525)	(15,980)	(32,146)	(30,989)
Total before tax	108	7	37	426
Income tax benefit	(122)	(2)	(214)	(148)
Net of tax	(14)	5	(177)	278
Accumulated other Comprehensive (Loss) Income Components | Reclassification adjustment for gains included in net income
Accumulated Other Comprehensive Income (Loss) [Line Items]
(Loss) gain on securities transactions, net	116	0	55	411
Accumulated other Comprehensive (Loss) Income Components | Reclassification adjustment of actuarial net (loss) gain included in net income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Compensation and employee benefits expense	$ 8	$ (7)	$ 18	$ (15)

XML

Derivatives and Hedging Activities - Narrative (Details)	6 Months Ended
	Mar. 31, 2018 USD ($) swap	Mar. 31, 2017 USD ($)	Sep. 30, 2017 USD ($) swap
Derivative [Line Items]
Derivative gains (losses) recorded in the Statements of Income	$ 0	$ 0
Accrued interest on derivatives, at fair value	2,000		$ 9,000
Currency forward contract - non-designated hedge
Derivative [Line Items]
Notional amount of derivative	1,600,000		1,600,000
Interest rate swap - cash flow hedge
Derivative [Line Items]
Notional amount of derivative	$ 30,000,000		$ 20,000,000
Number of interest rate derivatives held | swap	3		2

XML

Derivatives and Hedging Activities - Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Derivatives, Fair Value [Line Items]
Asset Derivative	$ 669	$ 277
Liability Derivative	0	182
Interest rate swap - cash flow hedge | Designated as hedging instrument | Other Assets
Derivatives, Fair Value [Line Items]
Asset Derivative	669	95
Interest rate swap - cash flow hedge | Designated as hedging instrument | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivative	$ 0	0
Currency forward contract - non-designated hedge | Not-designated hedge | Other Assets
Derivatives, Fair Value [Line Items]
Asset Derivative		182
Currency forward contract - non-designated hedge | Not-designated hedge | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivative		$ 182

XML

Subsequent Events - Narrative (Details) - Subsequent event	Apr. 20, 2018 shares
Columbia Bank, MHC
Subsequent Event [Line Items]
Shares issued (shares)	62,580,155
Columbia Bank Foundation
Subsequent Event [Line Items]
Shares issued (shares)	3,476,675
Employee Stock
Subsequent Event [Line Items]
Shares issued (shares)	49,832,345