Washington Federal (WAFD) 10-Q 1 May 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Mar. 31, 2019	Apr. 29, 2019
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Entity Registrant Name	WASHINGTON FEDERAL INC
Entity Central Index Key	0000936528
Current Fiscal Year End Date	--09-30
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		80,442,401

CONSOLIDATED STATEMENTS OF FINA

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
ASSETS
Cash and cash equivalents	$ 279,554	$ 268,650
Available-for-sale securities, at fair value	1,545,606
Available-for-sale securities, at fair value		1,314,957
Held-to-maturity securities, at amortized cost	1,553,683	1,625,420
Loans receivable, net of allowance for loan losses of $133,086 and $129,257	11,894,836	11,477,081
Interest receivable	50,790	47,295
Premises and equipment, net	277,010	267,995
Real estate owned	7,522	11,298
FHLB and FRB stock	138,390	127,190
Bank owned life insurance	219,167	216,254
Intangible assets, including goodwill of $301,368 and $301,368	310,266	311,286
Federal and state income tax assets, net	0	1,804
Other assets	158,384	196,494
Assets	16,435,208	15,865,724
Customer accounts
Transaction deposit accounts	6,782,998	6,582,343
Time deposit accounts	4,939,365	4,804,803
Customer accounts	11,722,363	11,387,146
FHLB advances	2,610,000	2,330,000
Advance payments by borrowers for taxes and insurance	25,839	57,417
Federal and state income tax liabilities, net	4,180	0
Accrued expenses and other liabilities	68,546	94,253
Liabilities	14,430,928	13,868,816
Stockholders’ equity
Common stock, $1.00 par value, 300,000,000 shares authorized; 135,506,620 and 135,343,417 shares issued; 80,435,217 and 82,710,911 shares outstanding	135,507	135,343
Additional paid-in capital	1,669,860	1,666,609
Accumulated other comprehensive income (loss), net of taxes	8,634	8,294
Treasury stock, at cost; 55,071,403 and 52,632,506 shares	(1,071,957)	(1,002,309)
Retained earnings	1,262,236	1,188,971
Stockholders’ equity	2,004,280	1,996,908
Liabilities and equity	$ 16,435,208	$ 15,865,724

CONSOLIDATED STATEMENTS OF FI_2

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Statement of Financial Position [Abstract]
Allowance for loan losses	$ 133,086	$ 129,257
Goodwill	$ 301,368	$ 301,368
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	135,506,620	135,343,417
Common stock, shares outstanding (in shares)	80,435,217	82,710,911
Treasury stock, shares (in shares)	55,071,403	52,632,506

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
INTEREST INCOME
Loans receivable	$ 141,061	$ 126,529	$ 278,126	$ 251,040
Mortgage-backed securities	19,343	17,667	38,535	34,566
Investment securities and cash equivalents	7,178	4,883	13,543	9,253
Interest income	167,582	149,079	330,204	294,859
INTEREST EXPENSE
Customer accounts	29,666	16,414	56,245	31,052
FHLB advances	17,846	15,364	34,737	30,771
Interest expense	47,512	31,778	90,982	61,823
Net interest income	120,070	117,301	239,222	233,036
Provision (release) for loan losses	750	(950)	250	(950)
Net interest income after provision (release)	119,320	118,251	238,972	233,986
OTHER INCOME
Gain (loss) on sale of investment securities	0	0	(9)	0
FDIC loss share valuation adjustments	0	0	0	(8,550)
Loan fee income	667	780	1,637	1,815
Deposit fee income	5,886	6,403	12,129	13,089
Other income	6,257	5,404	18,062	13,028
Other income, total	12,810	12,587	31,819	19,382
OTHER EXPENSE
Compensation and benefits	32,774	31,625	66,657	61,244
Occupancy	9,830	9,013	19,098	17,684
FDIC insurance premiums	1,978	2,852	4,840	5,672
Product delivery	3,545	3,665	7,566	7,621
Information technology	8,755	8,781	17,795	16,710
Other expense	11,085	9,851	23,683	18,797
Other expense, total	67,967	65,787	139,639	127,728
Gain (loss) on real estate owned, net	808	(278)	1,128	(232)
Income before income taxes	64,971	64,773	132,280	125,408
Income tax expense	13,873	15,502	28,240	24,467
NET INCOME	$ 51,098	$ 49,271	$ 104,040	$ 100,941
PER SHARE DATA
Basic earnings per share (in dollars per share)	$ 0.63	$ 0.58	$ 1.28	$ 1.17
Diluted earnings per share (in dollars per share)	0.63	0.57	1.28	1.17
Dividends paid on common stock per share (in dollars per share)	$ 0.2	$ 0.17	$ 0.38	$ 0.32
Basic weighted average number of shares outstanding (in shares)	80,968,050	85,647,494	81,384,456	86,299,885
Diluted weighted average number of shares outstanding (in shares)	80,990,126	85,747,167	81,415,697	86,422,077

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 51,098	$ 49,271	$ 104,040	$ 100,941
Other comprehensive income (loss) net of tax:
Net unrealized gain (loss) on available-for-sale investment securities	13,585	(11,467)	17,100	(13,431)
Reclassification adjustment of net gain (loss) from sale of available-for-sale securities included in net income	0	0	(9)	0
Related tax benefit (expense)	(3,091)	3,681	(3,889)	4,403
Other comprehensive income (loss) on available-for-sale securities, net of tax	10,494	(7,786)	13,202	(9,028)
Net unrealized gain (loss) on cash flow hedges of borrowings	(6,150)	10,332	(16,650)	17,022
Related tax benefit (expense)	1,399	(1,651)	3,788	(4,110)
Other comprehensive income (loss) on cash flow hedges of borrowings, net of tax	(4,751)	8,681	(12,862)	12,912
Other comprehensive income (loss) net of tax	5,743	895	340	3,884
Comprehensive income	$ 56,841	$ 50,166	$ 104,380	$ 104,825

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balance, beginning of period at Sep. 30, 2017	$ 2,005,688	$ 134,958	$ 1,660,885	$ 1,042,890	$ 5,015	$ (838,060)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	100,941			100,941
Other comprehensive income (loss)	3,884
Other comprehensive income (loss)	2,112				2,112
Dividends on common stock ($0.32 per share)	(26,855)			(26,855)
Proceeds from stock-based awards	1,232	56	1,176
Stock-based compensation expense	2,534	211	2,323
Exercise of stock warrants	0	109	(109)
Treasury stock acquired	(96,979)					(96,979)
Balance, end of period at Mar. 31, 2018	1,988,673	135,334	1,664,275	1,115,204	8,899	(935,039)
Balance, beginning of period at Dec. 31, 2017	2,009,618	135,275	1,661,866	1,081,517	8,004	(877,044)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	49,271			49,271
Other comprehensive income (loss)	895
Other comprehensive income (loss)	(877)				(877)
Dividends on common stock ($0.32 per share)	(13,812)			(13,812)
Proceeds from stock-based awards	946	42	904
Stock-based compensation expense	1,522	17	1,505
Treasury stock acquired	(57,995)					(57,995)
Balance, end of period at Mar. 31, 2018	1,988,673	135,334	1,664,275	1,115,204	8,899	(935,039)
Balance, beginning of period at Sep. 30, 2018	1,996,908	135,343	1,666,609	1,188,971	8,294	(1,002,309)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	104,040			104,040
Other comprehensive income (loss)	340				340
Dividends on common stock ($0.32 per share)	(30,775)			(30,775)
Proceeds from stock-based awards	553	24	529
Stock-based compensation expense	2,862	101	2,761
Exercise of stock warrants	0	39	(39)
Treasury stock acquired	(69,648)					(69,648)
Balance, end of period at Mar. 31, 2019	2,004,280	135,507	1,669,860	1,262,236	8,634	(1,071,957)
Balance, beginning of period at Dec. 31, 2018	1,983,089	135,496	1,668,666	1,227,275	2,891	(1,051,239)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	51,098			51,098
Other comprehensive income (loss)	5,743				5,743
Dividends on common stock ($0.32 per share)	(16,137)			(16,137)
Proceeds from stock-based awards	95	8	87
Stock-based compensation expense	1,110	3	1,107
Treasury stock acquired	(20,718)					(20,718)
Balance, end of period at Mar. 31, 2019	$ 2,004,280	$ 135,507	$ 1,669,860	$ 1,262,236	$ 8,634	$ (1,071,957)

CONSOLIDATED STATEMENTS OF ST_2

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	Feb. 22, 2019	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Dividends paid on common stock per share (in dollars per share)	$ 0.2	$ 0.2	$ 0.17	$ 0.38	$ 0.32

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 104,040,000	$ 100,941,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization, and accretion expense, net	14,924,000	26,756,000
Cash received from (paid to) FDIC under loss share agreements, net	0	1,595,000
Stock-based compensation expense	2,862,000	2,534,000
Provision (release) for loan losses	250,000	(950,000)
Loss (gain) on sale of investment securities	9,000	0
Gain on bank owned life insurance	0	(2,416,000)
Net realized (gain) loss on sales of premises, equipment, and real estate owned	(8,379,000)	(1,022,000)
Decrease (increase) in accrued interest receivable	(3,495,000)	(2,288,000)
Decrease (increase) in federal and state income tax receivable	1,804,000	(1,414,000)
Decrease (increase) in cash surrender value of bank owned life insurance	(2,913,000)	(3,012,000)
Decrease (increase) in other assets	21,460,000	(8,797,000)
Increase (decrease) in federal and state income tax liabilities	4,080,000	0
Increase (decrease) in accrued expenses and other liabilities	(25,707,000)	8,277,000
Net cash provided by (used in) operating activities	108,935,000	120,204,000
CASH FLOWS FROM INVESTING ACTIVITIES
Origination of loans and principal repayments, net	(417,355,000)	(199,526,000)
Loans purchased	0	(143,605,000)
FHLB & FRB stock purchased	(309,800,000)	(259,400,000)
FHLB & FRB stock redeemed	298,600,000	255,400,000
Available-for-sale securities purchased	(290,574,000)
Available-for-sale securities purchased		(123,324,000)
Principal payments and maturities of available-for-sale securities	75,483,000	104,733,000
Proceeds from sales of available-for-sale securities	491,000
Proceeds from sales of available-for-sale securities		0
Held-to-maturity securities purchased	0	(170,836,000)
Principal payments and maturities of held-to-maturity securities	70,096,000	98,781,000
Proceeds from sales of real estate owned	5,822,000	6,803,000
Proceeds from settlement of bank owned life insurance	0	3,484,000
Cash paid for acquisitions	0	(2,211,000)
Proceeds from sales of premises and equipment	11,622,000	1,000
Premises and equipment purchased and REO improvements	(26,337,000)	(12,819,000)
Net cash provided by (used in) investing activities	(581,952,000)	(442,519,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in customer accounts	335,369,000	304,001,000
Proceeds from borrowings	7,745,000,000	6,485,000,000
Repayments of borrowings	(7,465,000,000)	(6,385,000,000)
Proceeds from stock-based awards	553,000	1,232,000
Dividends paid on common stock	(30,775,000)	(26,855,000)
Treasury stock purchased	(69,648,000)	(96,979,000)
Increase (decrease) in borrower advances related to taxes and insurance, net	(31,578,000)	(15,346,000)
Net cash provided by (used in) financing activities	483,921,000	266,053,000
Increase (decrease) in cash and cash equivalents	10,904,000	(56,262,000)
Cash, cash equivalents and restricted cash at beginning of period	268,650,000	313,070,000
Cash, cash equivalents and restricted cash at end of period	279,554,000	256,808,000
Non-cash investing activities
Real estate acquired through foreclosure	253,000	1,329,000
Non-cash financing activities
Stock issued upon exercise of warrants	1,082,000	3,761,000
Cash paid during the period for
Interest	91,921,000	60,870,000
Income taxes	$ 15,255,000	$ 25,265,000

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Nature of Operations - Washington Federal, Inc. (the "Company") is a Washington corporation headquartered in Seattle, Washington. The Company is a bank holding company that conducts its operations through its national bank subsidiary, Washington Federal, National Association (the "Bank"). The Bank is principally engaged in the business of attracting deposits from businesses and the general public and investing these funds, together with borrowings and other funds, in commercial and consumer loans. As used throughout this document, the terms "Washington Federal" or the "Company" refer to Washington Federal, Inc. and its consolidated subsidiaries and the term "Bank" refers to the operating subsidiary Washington Federal, National Association. Basis of Presentation - The Company has prepared the consolidated unaudited interim financial statements included in this report. All intercompany transactions and accounts have been eliminated in consolidation. The preparation of financial statements, in conformity with accounting principles generally accepted in the United States of America (“GAAP”), requires management to make estimates and assumptions that affect amounts reported in the financial statements. Actual results could differ from these estimates. In the opinion of management, all adjustments (consisting only of normal recurring adjustments) necessary for a fair presentation are reflected in the interim financial statements. Certain amounts in the financial statements from prior periods have been reclassified to conform to the current financial statement presentation. The information included in this Form 10-Q should be read in conjunction with the financial statements and related notes in the Company's 2018 Annual Report on Form 10-K (“ 2018 Annual Financial Statements”). Interim results are not necessarily indicative of results for a full year. Summary of Significant Accounting Policies - The significant accounting policies used in preparation of the Company's consolidated financial statements are disclosed in its 2018 Annual Financial Statements. There have not been any material changes in the Company's significant accounting policies compared to those contained in its 2018 Annual Financial Statements for the year ended September 30, 2018 . Restricted Cash Balances - Based on the level of vault cash on hand, the Company was not required to maintain cash reserve balances with the Federal Reserve Bank as of March 31, 2019 . As of March 31, 2019 and September 30, 2018 , the Company pledged cash collateral related to derivative contracts of $18,000,000 and $18,000,000 , respectively. Equity Securities - The Company records equity securities within Other assets in its Consolidated Statements of Financial Condition. Investments in equity securities with readily determinable fair values (marketable) are measured at fair value, with changes in the fair value recognized as a component of Other income in the Consolidated Statements of Operations. Investments in equity investments that do not have readily determinable fair values (non-marketable) are accounted for at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or similar investment of the same issuer, also referred to as the measurement alternative. Any adjustments to the carrying value of these investments are recorded in Other income in the Consolidated Statements of Operations. Off-Balance-Sheet Credit Exposures - The only material off-balance-sheet credit exposures are loans in process and unused lines of credit, which had a combined balance of $2,265,227,000 and $2,180,162,000 at March 31, 2019 and September 30, 2018 , respectively. The Company estimates losses on off-balance-sheet credit exposures by allocating a loss percentage derived from historical loss factors for each asset class.

New Accounting Pronouncements

New Accounting Pronouncements	6 Months Ended
	Mar. 31, 2019
Accounting Changes and Error Corrections [Abstract]
New Accounting Pronouncements	New Accounting Pronouncements In April 2019, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2019-04, Codification Improvements to Topic 326, Financial Instruments-Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments, that clarifies and improves areas of guidance related to the recently issued standards on credit losses (ASU 2016-13), hedging (ASU 2017-12), and recognition and measurement of financial instruments (ASU 2016-01). The amendments generally have the same effective dates as their related standards. If already adopted, the amendments of ASU 2016-01 and ASU 2016-13 are effective for fiscal years beginning after December 15, 2019 and the amendments of ASU 2017-12 are effective as of the beginning of the Company’s next annual reporting period; early adoption is permitted. The Company previously adopted both ASU 2017-12 and ASU 2016-01 and does not expect the amendments of ASU 2019-04 will have a material impact on its consolidated financial statements. The Company is continuing to evaluate the impact of ASU 2016-13 and will consider the amendments of ASU 2019-04 as part of that process. In August 2018, the FASB issued ASU 2018-15, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract . The amendments in this ASU align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The amendments also require the entity to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement, including reasonably certain renewal periods. The amendments in the ASU are effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years. Early adoption is permitted, including adoption in any interim period. The Company is assessing the impact that this guidance will have on its consolidated financial statements. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement . This ASU adds, eliminates, and modifies certain disclosure requirements for fair value measurements. Among the changes, entities will no longer be required to disclose the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, but will be required to disclose the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements. The ASU is effective for interim and annual reporting periods beginning after December 15, 2019; early adoption is permitted. Entities are also allowed to elect early adoption of the eliminated or modified disclosure requirements and delay adoption of the added disclosure requirements until their effective date. As the ASU only revises disclosure requirements, this guidance will not have a material impact on the Company's consolidated financial statements. In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842) - Targeted Improvements to provide entities with relief from the costs of implementing certain aspects of the new leasing standard, ASU No. 2016-02. Specifically, under the amendments in ASU 2018-11: (1) entities may elect not to recast the comparative periods presented when transitioning to the new leasing standard, and (2) lessors may elect to not separate non-lease components from leases when certain conditions are met. The amendments have the same effective date as ASU 2016-02 (October 1, 2019 for the Company). The Company expects to elect both transition options. ASU 2018-11 is not expected to have a material impact on the Company's consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses . The amendments in this ASU were issued to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments that are not accounted for at fair value through net income, including loans held for investment, held-to-maturity debt securities, trade and other receivables, net investments in leases and other commitments to extend credit held by a reporting entity at each reporting date. The amendments require that financial assets measured at amortized cost be presented at the net amount expected to be collected, through an allowance for credit losses that is deducted from the amortized cost basis. The ASU eliminates the current framework of recognizing probable incurred losses and instead requires an entity to use its current estimate of all expected credit losses over the contractual life. The measurement of expected credit losses is based upon historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the financial assets. For purchased financial assets with a more-than-insignificant amount of credit deterioration since origination (“PCD assets”) that are measured at amortized cost, an allowance for expected credit losses is recorded as an adjustment to the cost basis of the asset. Subsequent changes in estimated cash flows would be recorded as an adjustment to the allowance and through the statement of income. Credit losses relating to available-for-sale debt securities will be recorded through an allowance for credit losses rather than as a direct write-down to the security's cost basis. The amendments in this ASU are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. For most debt securities, the transition approach requires a cumulative-effect adjustment to the statement of financial position as of the beginning of the first reporting period the guidance is effective. For other-than-temporarily impaired debt securities and PCD assets, the guidance will be applied prospectively. While the Company is currently in the process of evaluating the impact of the amended guidance on its consolidated financial statements, it currently expects the ALLL to increase upon adoption given that the allowance will be required to cover the full remaining expected life of the portfolio upon adoption, rather than the incurred loss model under current U.S. GAAP. The extent of this increase is still being evaluated and will depend on economic conditions and the composition of the Company’s loan and lease portfolio at the time of adoption. In February 2016, the FASB issued ASU 2016-02, Leases . The ASU, as amended, requires lessees to recognize a lease liability, which is a lessee's obligation to make lease payments arising from a lease, and a right-of-use asset, which is an asset that represents the lessee's right to use, or control the use of, a specified asset for the lease term. The guidance also simplifies the accounting for sale and leaseback transactions and introduces new disclosure requirements for leasing arrangements. Accounting by lessors is largely unchanged. The amendments are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company will adopt the standard effective October 1, 2019. Lessees (for capital and operating leases) and lessors (for sales-type, direct financing, and operating leases) must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The modified retrospective approach would not require any transition accounting for leases that expired before the earliest comparative period presented. The Company leases a number of properties under non-cancelable operating leases which will be subject to this ASU. We do not expect a material impact to our Consolidated Statement of Operations as a result of this ASU. While the Company has not quantified the impact to its Consolidated Statement of Condition, the Company expects to recognize right-of-use assets and lease liabilities for substantially all of its operating lease commitments based on the present value of unpaid lease payments as of the date of adoption. For information on the Company's future minimum lease payments, refer to Note I Premises and Equipment in our Annual Report on Form 10-K for the year ended September 30, 2018.

Dividends and Share Repurchases

Dividends and Share Repurchases	6 Months Ended
	Mar. 31, 2019
Stockholders' Equity Note [Abstract]
Dividends and Share Repurchases	Dividends and Share Repurchases On February 22, 2019 , the Company paid a regular dividend on common stock of $0.20 per share, which represented the 144 th consecutive quarterly cash dividend. Dividends per share were $ 0.20 and $ 0.17 for the quarters ended March 31, 2019 and 2018 , respectively. On April 29, 2019 , the Company declared a regular dividend on common stock of $0.20 per share, which represents its 145 th consecutive quarterly cash dividend. This dividend will be paid on May 24, 2019 to common shareholders of record on May 10, 2019 . For the three months ended March 31, 2019 , the Company repurchased 698,705 shares at an average price of $29.65 . As of March 31, 2019 , there are 9,593,701 remaining shares authorized to be repurchased under the current Board approved share repurchase program.

Loans Receivable

Loans Receivable	6 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Loans Receivable	Loans Receivable The following table is a summary of loans receivable. March 31, 2019 September 30, 2018 (In thousands) (In thousands) Gross loans by category Single-family residential $ 5,861,404 44.3 % $ 5,798,966 45.1 % Construction 1,980,274 15.0 1,890,668 14.7 Construction - custom 586,515 4.4 624,479 4.9 Land - acquisition & development 194,739 1.5 155,204 1.2 Land - consumer lot loans 97,152 0.7 102,036 0.8 Multi-family 1,423,723 10.7 1,385,125 10.8 Commercial real estate 1,570,502 11.9 1,452,168 11.3 Commercial & industrial 1,230,888 9.3 1,140,874 8.9 HELOC 139,203 1.0 130,852 1.0 Consumer 156,002 1.2 173,306 1.3 Total gross loans 13,240,402 100 % 12,853,678 100 % Less: Allowance for loan losses 133,086 129,257 Loans in process 1,162,787 1,195,506 Net deferred fees, costs and discounts 49,693 51,834 Total loan contra accounts 1,345,566 1,376,597 Net loans $ 11,894,836 $ 11,477,081 The following table sets forth information regarding non-accrual loans. March 31, 2019 September 30, 2018 (In thousands, except ratio data) Non-accrual loans: Single-family residential $ 24,474 50.0 % $ 27,643 49.6 % Construction 1,282 2.6 2,427 4.4 Land - acquisition & development 242 0.5 920 1.7 Land - consumer lot loans 579 1.2 787 1.4 Commercial real estate 9,162 18.7 8,971 16.1 Commercial & industrial 12,366 25.3 14,394 25.8 HELOC 812 1.7 523 0.9 Consumer 24 — 21 — Total non-accrual loans $ 48,941 100 % $ 55,686 100 % % of total net loans 0.41 % 0.49 % The Company recognized interest income on non-accrual loans of approximately $1,571,000 in the six months ended March 31, 2019 . Had these loans been on accrual status and performed according to their original contract terms, the Company would have recognized interest income of approximately $1,151,000 for the six months ended March 31, 2019 . Recognized interest income for the six months ended March 31, 2019 was higher than what otherwise would have been collected in the period due to the collection of past due amounts. Interest cash flows collected on non-accrual loans vary from period to period as those loans are brought current or are paid off. The following tables provide details regarding delinquent loans. March 31, 2019 Loans Receivable Days Delinquent Based on $ Amount of Loans % based on $ Type of Loan Net of Loans In Process Current 30 60 90 Total Delinquent (In thousands, except ratio data) Single-family residential $ 5,860,365 $ 5,830,848 $ 10,018 $ 2,672 $ 16,827 $ 29,517 0.50 % Construction 1,139,970 1,138,688 — — 1,282 1,282 0.11 Construction - custom 307,405 306,929 — 476 — 476 0.15 Land - acquisition & development 152,546 152,394 152 — — 152 0.10 Land - consumer lot loans 97,033 96,278 502 — 253 755 0.78 Multi-family 1,423,701 1,422,270 1,431 — — 1,431 0.10 Commercial real estate 1,570,502 1,566,393 743 — 3,366 4,109 0.26 Commercial & industrial 1,230,888 1,221,571 311 — 9,006 9,317 0.76 HELOC 139,203 137,982 388 229 604 1,221 0.88 Consumer 156,002 155,749 91 16 146 253 0.16 Total Loans $ 12,077,615 $ 12,029,102 $ 13,636 $ 3,393 $ 31,484 $ 48,513 0.40 % Delinquency % 99.60% 0.11% 0.03% 0.26% 0.40% September 30, 2018 Loans Receivable Days Delinquent Based on $ Amount of Loans % based on $ Type of Loan Net of Loans In Process Current 30 60 90 Total Delinquent (In thousands, except ratio data) Single-family residential $ 5,798,353 $ 5,768,253 $ 7,983 $ 3,562 $ 18,555 $ 30,100 0.52 % Construction 1,062,855 1,060,428 — — 2,427 2,427 0.23 Construction - custom 289,192 289,192 — — — — — Land - acquisition & development 123,560 122,620 — 270 670 940 0.76 Land - consumer lot loans 101,908 101,294 144 117 353 614 0.60 Multi-family 1,385,103 1,385,103 — — — — — Commercial real estate 1,452,169 1,448,946 316 1,767 1,140 3,223 0.22 Commercial & industrial 1,140,874 1,130,836 — — 10,038 10,038 0.88 HELOC 130,852 129,510 567 469 306 1,342 1.03 Consumer 173,306 172,777 172 328 29 529 0.31 Total Loans $ 11,658,172 $ 11,608,959 $ 9,182 $ 6,513 $ 33,518 $ 49,213 0.42 % Delinquency % 99.58% 0.08% 0.06% 0.29% 0.42% The percentage of total delinquent loans was 0.40% as of March 31, 2019 and 0.42% as of September 30, 2018 . There are no loans greater than 90 days delinquent and still accruing interest as of either date. The following table provides information related to loans restructured in a troubled debt restructuring ("TDR") during the periods presented: Three Months Ended March 31, 2019 2018 Pre-Modification Post-Modification Pre-Modification Post-Modification Outstanding Outstanding Outstanding Outstanding Number of Recorded Recorded Number of Recorded Recorded Contracts Investment Investment Contracts Investment Investment ($ in thousands) ($ in thousands) Troubled Debt Restructurings: Single-family residential 2 $ 39 $ 39 12 $ 2,183 $ 2,183 Land - consumer lot loans 1 40 40 — — — 3 $ 79 $ 79 12 $ 2,183 $ 2,183 Six Months Ended March 31, 2019 2018 Pre-Modification Post-Modification Pre-Modification Post-Modification Outstanding Outstanding Outstanding Outstanding Number of Recorded Recorded Number of Recorded Recorded Contracts Investment Investment Contracts Investment Investment ($ in thousands) ($ in thousands) Troubled Debt Restructurings: Single-family residential 3 $ 323 $ 323 20 $ 4,195 $ 4,195 Land - consumer lot loans 1 40 40 — — — Commercial & Industrial — — — 3 7,256 7,256 4 $ 363 $ 363 23 $ 11,451 $ 11,451 The following table provides information on payment defaults occurring during the periods presented where the loan had been modified in a TDR within 12 months of the payment default. Three Months Ended March 31, 2019 2018 Number of Recorded Number of Recorded Contracts Investment Contracts Investment ($ in thousands) ($ in thousands) Trouble Debt Restructurings That Subsequently Defaulted: Single-family residential 4 $ 755 1 $ 162 4 $ 755 1 $ 162 Six Months Ended March 31, 2019 2018 Number of Recorded Number of Recorded Contracts Investment Contracts Investment ($ in thousands) ($ in thousands) Trouble Debt Restructurings That Subsequently Defaulted: Single-family residential 5 $ 1,298 2 $ 206 5 $ 1,298 2 $ 206 Most loans restructured in TDRs are accruing and performing loans where the borrower has proactively approached the Company about modification due to temporary financial difficulties. As of March 31, 2019 , 96.9% of the Company's $140,599,000 in TDRs were classified as performing. Each request for modification is individually evaluated for merit and likelihood of success. The concession granted in a loan modification is typically a payment reduction through a rate reduction of between 100 to 200 basis points for a specific term, usually six to twenty four months. Interest-only payments may also be approved during the modification period. Principal forgiveness is not an available option for restructured loans. As of March 31, 2019 , single-family residential loans comprised 89.8% of TDRs. The Company reserves for restructured loans within its allowance for loan loss methodology by taking into account the following performance indicators: 1) time since modification, 2) current payment status and 3) geographic area.

Allowance for Losses on Loans

Allowance for Losses on Loans	6 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Allowance for Losses on Loans	Allowance for Losses on Loans The following tables summarize the activity in the allowance for loan losses. Three Months Ended March 31, 2019 Beginning Allowance Charge-offs Recoveries Provision & Transfers Ending Allowance (In thousands) Single-family residential $ 31,484 $ (150 ) $ 310 $ (168 ) $ 31,476 Construction 31,463 — — 1,933 33,396 Construction - custom 1,926 — — 50 1,976 Land - acquisition & development 9,156 — 1,300 (722 ) 9,734 Land - consumer lot loans 2,144 (48 ) — (20 ) 2,076 Multi-family 7,884 — — (490 ) 7,394 Commercial real estate 12,711 — 244 (507 ) 12,448 Commercial & industrial 30,279 (285 ) 24 556 30,574 HELOC 1,064 (200 ) 43 175 1,082 Consumer 3,054 (332 ) 265 (57 ) 2,930 $ 131,165 $ (1,015 ) $ 2,186 $ 750 $ 133,086 Three Months Ended March 31, 2018 Beginning Allowance Charge-offs Recoveries Provision & Transfers Ending Allowance (In thousands) Single-family residential $ 35,928 $ (290 ) $ 211 $ (1,705 ) $ 34,144 Construction 25,214 — — 2,175 27,389 Construction - custom 2,052 — — 29 2,081 Land - acquisition & development 7,355 — 1,207 (940 ) 7,622 Land - consumer lot loans 2,906 (18 ) — (35 ) 2,853 Multi-family 7,904 — — 78 7,982 Commercial real estate 11,625 (36 ) 1 (2 ) 11,588 Commercial & industrial 29,268 — 115 (53 ) 29,330 HELOC 808 (1 ) — (5 ) 802 Consumer 4,095 (94 ) 276 (492 ) 3,785 $ 127,155 $ (439 ) $ 1,810 $ (950 ) $ 127,576 Six Months Ended March 31, 2019 Beginning Allowance Charge-offs Recoveries Provision & Transfers Ending Allowance (In thousands) Single-family residential $ 33,033 $ (175 ) $ 539 $ (1,921 ) $ 31,476 Construction 31,317 — — 2,079 33,396 Construction - custom 1,842 — — 134 1,976 Land - acquisition & development 7,978 — 3,082 (1,326 ) 9,734 Land - consumer lot loans 2,164 (120 ) 265 (233 ) 2,076 Multi-family 8,329 — — (935 ) 7,394 Commercial real estate 11,852 (339 ) 770 165 12,448 Commercial & industrial 28,702 (464 ) 58 2,278 30,574 HELOC 781 (1,086 ) 44 1,343 1,082 Consumer 3,259 (472 ) 477 (334 ) 2,930 $ 129,257 $ (2,656 ) $ 5,235 $ 1,250 $ 133,086 Six Months Ended March 31, 2018 Beginning Allowance Charge-offs Recoveries Provision & Transfers Ending Allowance (In thousands) Single-family residential $ 36,892 $ (750 ) $ 331 $ (2,329 ) $ 34,144 Construction 24,556 — — 2,833 27,389 Construction - custom 1,944 (50 ) — 187 2,081 Land - acquisition & development 6,829 — 4,579 (3,786 ) 7,622 Land - consumer lot loans 2,649 (66 ) — 270 2,853 Multi-family 7,862 — — 120 7,982 Commercial real estate 11,818 (36 ) 1 (195 ) 11,588 Commercial & industrial 28,524 (116 ) 170 752 29,330 HELOC 855 (1 ) 1 (53 ) 802 Consumer 1,144 (172 ) 562 2,251 3,785 $ 123,073 $ (1,191 ) $ 5,644 $ 50 $ 127,576 The Company recorded a provision for loan losses of $750,000 for the three months ended March 31, 2019 , compared to a $950,000 release of allowance for loan losses for the three months ended March 31, 2018 . A provision for loan losses of $250,000 and a release of allowance for loan losses of $950,000 was recorded for the six months ended March 31, 2019 and March 31, 2018 , respectively. Reserving for new loan originations as the loan portfolio grows has been largely offset by recoveries of previously charged-off loans. Recoveries, net of charge-offs, totaled $1,171,000 for the three months ended March 31, 2019 , compared to net recoveries of $1,371,000 during the three months ended March 31, 2018 . Recoveries, net of charge-offs, totaled $2,579,000 for the six months ended March 31, 2019 , compared to net recoveries of $4,453,000 during the six months ended March 31, 2018 . Non-performing assets were $59,572,000 , or 0.36% of total assets, at March 31, 2019 , compared to $70,093,000 , or 0.44% of total assets, at September 30, 2018 . Non-accrual loans were $48,941,000 at March 31, 2019 , compared to $55,686,000 at September 30, 2018 . Delinquencies, as a percent of total loans, were 0.40% at March 31, 2019 , compared to 0.42% at September 30, 2018 . The reserve for unfunded commitments was $6,250,000 as of March 31, 2019 , which is a decrease from $7,250,000 at September 30, 2018 . Management believes the allowance for loan losses plus the reserve for unfunded commitments, totaling $139,336,000 , or 1.05% of gross loans as of March 31, 2019 , is sufficient to absorb estimated losses inherent in the portfolio of loans and unfunded commitments. The following tables show loans collectively and individually evaluated for impairment and the related allocation of general and specific reserves. March 31, 2019 Loans Collectively Evaluated for Impairment Loans Individually Evaluated for Impairment Allowance Allocation Recorded Investment of Loans Ratio Allowance Allocation Recorded Investment of Loans Ratio (In thousands, except ratio data) (In thousands, except ratio data) Single-family residential $ 31,476 $ 5,848,663 0.5 % $ — $ 16,836 — % Construction 33,396 1,138,688 2.9 — 1,282 — Construction - custom 1,976 307,405 0.6 — — — Land - acquisition & development 9,727 152,304 6.4 7 242 2.9 Land - consumer lot loans 2,076 92,614 2.2 — 309 — Multi-family 7,390 1,422,864 0.5 4 837 0.5 Commercial real estate 12,328 1,552,990 0.8 120 17,512 0.7 Commercial & industrial 30,329 1,219,921 2.5 245 12,651 1.9 HELOC 1,082 137,716 0.8 — 528 — Consumer 2,930 154,201 1.9 — 52 — $ 132,710 $ 12,027,366 1.1 % $ 376 $ 50,249 0.7 % September 30, 2018 Loans Collectively Evaluated for Impairment Loans Individually Evaluated for Impairment Allowance Allocation Recorded Investment of Loans Ratio Allowance Allocation Recorded Investment of Loans Ratio (In thousands, except ratio data) (In thousands, except ratio data) Single-family residential $ 33,033 $ 5,782,870 0.6 % $ — $ 21,345 — % Construction 31,317 1,060,428 3.0 — 2,427 — Construction - custom 1,842 289,192 0.6 — — — Land - acquisition & development 7,969 122,639 6.5 9 920 1.0 Land - consumer lot loans 2,164 96,583 2.2 — 507 — Multi-family 8,325 1,384,655 0.6 4 448 1.0 Commercial real estate 11,702 1,432,791 0.8 150 19,378 0.8 Commercial & industrial 28,348 1,126,438 2.5 354 14,437 2.5 HELOC 781 128,715 0.6 — 1,162 — Consumer 3,259 173,181 1.9 — 56 — $ 128,740 $ 11,597,492 1.1 % $ 517 $ 60,680 0.9 % As of March 31, 2019 , $132,710,000 of the allowance was calculated under the Company's general allowance methodology and the remaining $376,000 was specific reserves on loans deemed to be individually impaired. As of September 30, 2018 , $128,740,000 of the allowance was calculated under the Company's general allowance methodology and the remaining $517,000 was specific reserves on loans deemed to be individually impaired. The Company has an asset quality review function that analyzes its loan portfolio and reports the results of the review to its Board of Directors on a quarterly basis. The single-family residential, HELOC and consumer portfolios are evaluated based on their performance as a pool of loans, since no single loan is individually significant or judged by its risk rating, size or potential risk of loss. The construction, land, multi-family, commercial real estate and commercial and industrial loans are risk rated on a loan by loan basis to determine the relative risk inherent in specific borrowers or loans. Based on that risk rating, the loans are assigned a grade and classified as follows: • Pass – the credit does not meet one of the definitions below. • Special mention – A special mention credit is considered to be currently protected from loss but is potentially weak. No loss of principal or interest is foreseen; however, proper supervision and management attention is required to deter further deterioration in the credit. Assets in this category constitute some undue and unwarranted credit risk but not to the point of justifying a risk rating of substandard. The credit risk may be relatively minor yet constitutes an unwarranted risk in light of the circumstances surrounding a specific asset. • Substandard – A substandard credit is an unacceptable credit. Additionally, repayment in the normal course is in jeopardy due to the existence of one or more well defined weaknesses. In these situations, loss of principal is likely if the weakness is not corrected. A substandard asset is inadequately protected by the current sound worth and paying capacity of the borrower or of the collateral pledged, if any. Assets so classified will have a well-defined weakness or weaknesses that jeopardize the collection or liquidation of the debt. Loss potential, while existing in the aggregate amount of substandard assets, does not have to exist in individual assets risk rated substandard. • Doubtful – A credit classified doubtful has all the weaknesses inherent in one classified substandard with the added characteristic that the weakness makes collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. The probability of loss is high, but because of certain important and reasonably specific pending factors that may work to the advantage and strengthening of the asset, its classification as an estimated loss is deferred until its more exact status may be determined. Pending factors include proposed merger, acquisition, or liquidation procedures, capital injection, perfecting liens on additional collateral, and refinancing plans. • Loss – Credits classified loss are considered uncollectible and of such little value that their continuance as a bankable asset is not warranted. This classification does not mean that the asset has absolutely no recovery or salvage value, but rather it is not practical or desirable to defer writing off this asset even though partial recovery may be affected in the future. Losses should be taken in the period in which they are identified as uncollectible. Partial charge-off versus full charge-off may be taken if the collateral offers some identifiable protection. The following tables provide information on loans based on risk rating categories as defined above. March 31, 2019 Internally Assigned Grade Pass Special mention Substandard Doubtful Loss Total Gross Loans (In thousands, except ratio data) Loan type Single-family residential $ 5,831,775 $ — $ 29,629 $ — $ — $ 5,861,404 Construction 1,978,992 — 1,282 — — 1,980,274 Construction - custom 586,515 — — — — 586,515 Land - acquisition & development 190,807 2,424 1,508 — — 194,739 Land - consumer lot loans 96,573 — 579 — — 97,152 Multi-family 1,415,872 — 7,851 — — 1,423,723 Commercial real estate 1,529,461 7,599 33,442 — — 1,570,502 Commercial & industrial 1,195,835 4,238 30,815 — — 1,230,888 HELOC 138,391 — 812 — — 139,203 Consumer 155,978 — 24 — — 156,002 Total gross loans $ 13,120,199 $ 14,261 $ 105,942 $ — $ — $ 13,240,402 Total grade as a % of total gross loans 99.1 % 0.1 % 0.8 % — % — % September 30, 2018 Internally Assigned Grade Pass Special mention Substandard Doubtful Loss Total Gross Loans (In thousands, except ratio data) Loan type Single-family residential $ 5,766,096 $ — $ 32,870 $ — $ — $ 5,798,966 Construction 1,886,304 1,937 2,427 — — 1,890,668 Construction - custom 624,479 — — — — 624,479 Land - acquisition & development 152,984 — 2,220 — — 155,204 Land - consumer lot loans 101,249 — 787 — — 102,036 Multi-family 1,378,803 1,633 4,689 — — 1,385,125 Commercial real estate 1,421,602 7,114 23,452 — — 1,452,168 Commercial & industrial 1,093,405 16,513 30,956 — — 1,140,874 HELOC 130,330 — 522 — — 130,852 Consumer 173,285 — 21 — — 173,306 Total gross loans $ 12,728,537 $ 27,197 $ 97,944 $ — $ — $ 12,853,678 Total grade as a % of total gross loans 99.0 % 0.2 % 0.8 % — % — % The following tables provide information on gross loans based on borrower payment activity. March 31, 2019 Performing Loans Non-Performing Loans Amount % of Total Gross Loans Amount % of Total Gross Loans (In thousands, except ratio data) Single-family residential $ 5,836,930 99.6 % $ 24,474 0.4 % Construction 1,978,992 99.9 1,282 0.1 Construction - custom 586,515 100.0 — — Land - acquisition & development 194,497 99.9 242 0.1 Land - consumer lot loans 96,573 99.4 579 0.6 Multi-family 1,423,723 100.0 — — Commercial real estate 1,561,340 99.4 9,162 0.6 Commercial & industrial 1,218,522 99.0 12,366 1.0 HELOC 138,391 99.4 812 0.6 Consumer 155,978 100.0 24 — $ 13,191,461 99.6 % $ 48,941 0.4 % September 30, 2018 Performing Loans Non-Performing Loans Amount % of Total Gross Loans Amount % of Total Gross Loans (In thousands, except ratio data) Single-family residential $ 5,771,323 99.5 % $ 27,643 0.5 % Construction 1,888,241 99.9 2,427 0.1 Construction - custom 624,479 100.0 — — Land - acquisition & development 154,284 99.4 920 0.6 Land - consumer lot loans 101,249 99.2 787 0.8 Multi-family 1,385,125 100.0 — — Commercial real estate 1,443,197 99.4 8,971 0.6 Commercial & industrial 1,126,480 98.7 14,394 1.3 HELOC 130,329 99.6 523 0.4 Consumer 173,285 100.0 21 — $ 12,797,992 99.6 % $ 55,686 0.4 % The following tables provide information on impaired loan balances and the related allowances by loan types. March 31, 2019 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment (Year-To-Date) (In thousands) Impaired loans with no related allowance recorded: Single-family residential $ 16,089 $ 16,964 $ — $ 16,800 Construction 1,532 1,750 — 1,953 Land - acquisition & development 143 143 — 431 Land - consumer lot loans 135 165 — 209 Commercial real estate 8,757 13,482 — 9,376 Commercial & industrial 9,006 9,321 — 9,670 HELOC 528 528 — 486 Consumer 22 88 — 22 36,212 42,441 — 38,947 Impaired loans with an allowance recorded: Single-family residential 126,265 129,043 2,202 133,290 Land - acquisition & development 99 154 — 103 Land - consumer lot loans 4,489 4,946 7 4,669 Multi-family 419 419 4 434 Commercial real estate 4,942 6,051 120 5,583 Commercial & industrial 3,360 6,830 245 3,937 HELOC 960 972 — 968 Consumer 65 65 — 67 140,599 148,480 2,578 (1) 149,051 Total impaired loans: Single-family residential 142,354 146,007 2,202 150,090 Construction 1,532 1,750 — 1,953 Land - acquisition & development 242 297 — 534 Land - consumer lot loans 4,624 5,111 7 4,878 Multi-family 419 419 4 434 Commercial real estate 13,699 19,533 120 14,959 Commercial & industrial 12,366 16,151 245 13,607 HELOC 1,488 1,500 — 1,454 Consumer 87 153 — 89 $ 176,811 $ 190,921 $ 2,578 (1) $ 187,998 (1) Includes $376,000 of specific reserves and $2,202,000 included in the general reserves. September 30, 2018 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment (In thousands) Impaired loans with no related allowance recorded: Single-family residential $ 18,872 $ 20,050 $ — $ 20,097 Construction 2,698 2,818 — 1,349 Construction - custom — — — 74 Land - acquisition & development 814 814 — 572 Land - consumer lot loans 311 336 — 260 Multi-family — — — 70 Commercial real estate 9,425 14,035 — 11,158 Commercial & industrial 10,137 10,146 — 9,208 HELOC 410 1,170 — 450 Consumer 20 56 — 54 42,687 49,425 — 43,292 Impaired loans with an allowance recorded: Single-family residential 139,796 143,099 2,871 161,729 Land - acquisition & development 107 157 — 39 Land - consumer lot loans 4,916 5,290 9 6,449 Multi-family 448 448 4 471 Commercial real estate 6,254 7,733 150 10,445 Commercial & industrial 4,291 7,506 354 4,495 HELOC 976 984 — 1,395 Consumer 70 70 — 83 156,858 165,287 3,388 (1) 185,106 Total impaired loans: Single-family residential 158,668 163,149 2,871 181,826 Construction 2,698 2,818 — 1,349 Construction - custom — — — 74 Land - acquisition & development 921 971 — 611 Land - consumer lot loans 5,227 5,626 9 6,709 Multi-family 448 448 4 541 Commercial real estate 15,679 21,768 150 21,603 Commercial & industrial 14,428 17,652 354 13,703 HELOC 1,386 2,154 — 1,845 Consumer 90 126 — 137 $ 199,545 $ 214,712 $ 3,388 (1) $ 228,398 (1) Includes $517,000 of specific reserves and $2,871,000 included in the general reserves.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements FASB ASC 820 defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. ASC 820 also establishes a fair value hierarchy that requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair value: Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active exchange markets that the entity has the ability to access as of the measurement date. Level 2: Significant other observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active and other inputs that are observable or can be corroborated by observable market data. Level 3: Significant unobservable inputs that reflect a company’s own assumptions about the assumptions that market participants would use in pricing an asset or liability. The Company has established and documented the process for determining the fair values of its assets and liabilities, where applicable. Fair value is based on quoted market prices, when available, for identical or similar assets or liabilities. In the absence of quoted market prices, fair value is determined using valuation models or third-party appraisals. The following is a description of the valuation methodologies used to measure and report the fair value of financial assets and liabilities on a recurring or nonrecurring basis. Measured on a Recurring Basis Available-for-Sale Securities and Derivative Contracts Securities available for sale are recorded at fair value on a recurring basis. The fair value of debt securities are priced using model pricing based on the securities' relationship to other benchmark quoted prices as provided by an independent third party, and under GAAP are considered a Level 2 input method. Securities that are traded on active exchanges, including the Company's equity securities, are measured using the closing price in an active market and are considered a Level 1 input method. The Company offers interest rate swaps to its variable rate borrowers who want to manage their interest rate risk. At the same time, the Company enters into the opposite trade with a counter party to offset its interest rate risk. The Company has also entered into commercial loan hedges as well as borrowings hedges using interest rate swaps. The fair value of these interest rate swaps are estimated by a third party pricing service using a discounted cash flow technique. These are considered a Level 2 input method. The following tables present the balance of assets and liabilities measured at fair value on a recurring basis. March 31, 2019 Level 1 Level 2 Level 3 Total (In thousands) Financial Assets Available-for-sale securities: U.S. government and agency securities $ — $ 235,280 $ — $ 235,280 Municipal bonds — 22,408 — 22,408 Corporate debt securities — 257,981 — 257,981 Mortgage-backed securities Agency pass-through certificates — 1,029,937 — 1,029,937 Total available-for-sale securities — 1,545,606 — 1,545,606 Interest rate contracts — 2,822 — 2,822 Borrowings hedges — 5,600 — 5,600 Total financial assets $ — $ 1,554,028 $ — $ 1,554,028 Financial Liabilities Interest rate contracts $ — $ 2,822 $ — $ 2,822 Commercial loan hedges — 94 — 94 Total financial liabilities $ — $ 2,916 $ — $ 2,916 There were no transfers between, into and/or out of Levels 1, 2 or 3 during the six months ended March 31, 2019 . September 30, 2018 Level 1 Level 2 Level 3 Total (In thousands) Financial Assets Available-for-sale securities: Equity securities $ 488 $ — $ — $ 488 U.S. government and agency securities — 207,293 — 207,293 Municipal bonds — 22,978 — 22,978 Corporate debt securities — 184,695 — 184,695 Mortgage-backed securities Agency pass-through certificates — 896,041 — 896,041 Commercial MBS — 3,462 — 3,462 Total available-for-sale securities 488 1,314,469 — 1,314,957 Interest rate contracts — 12,731 — 12,731 Commercial loan hedges — 3,857 — 3,857 Borrowings hedges — 22,250 — 22,250 Total financial assets $ 488 $ 1,353,307 $ — $ 1,353,795 Financial Liabilities Interest rate contracts $ — $ 12,731 $ — $ 12,731 Total financial liabilities $ — $ 12,731 $ — $ 12,731 There were no transfers between, into and/or out of Levels 1, 2 or 3 during the fiscal year ended September 30, 2018 . Measured on a Nonrecurring Basis Impaired Loans & Real Estate Owned Real estate owned ("REO") consists principally of properties acquired through foreclosure. From time to time, and on a nonrecurring basis, adjustments using fair value measurements are recorded to reflect increases or decreases based on the discounted cash flows, the current appraisal or estimated value of the collateral, but only up to the fair value of the real estate owned as of the initial transfer date less selling costs. When management determines that the fair value of the collateral or the real estate owned requires additional adjustments, either as a result of an updated appraised value or when there is no observable market price, the Company classifies the impaired loan or real estate owned as Level 3. Level 3 assets recorded at fair value on a nonrecurring basis at March 31, 2019 included loans for which a specific reserve allowance was established or a partial charge-off was recorded based on the fair value of collateral, as well as real estate owned where the fair value of the property was less than the cost basis. The following tables present the aggregated balance of assets that were measured at fair value on a nonrecurring basis at March 31, 2019 and March 31, 2018 , and the total gains (losses) resulting from those fair value adjustments for the three and six months ended March 31, 2019 and March 31, 2018 . The estimated fair value measurements are shown gross of estimated selling costs. March 31, 2019 Three Months Ended March 31, 2019 Six Months Ended March 31, 2019 Level 1 Level 2 Level 3 Total Total Gains (Losses) (In thousands) (In thousands) Impaired loans (1) $ — $ — $ 3,316 $ 3,316 $ (511 ) $ (1,237 ) Real estate owned (2) — — 2,550 2,550 431 399 Balance at end of period $ — $ — $ 5,866 $ 5,866 $ (80 ) $ (838 ) (1) The gains (losses) represent remeasurements of collateral-dependent loans. (2) The gains (losses) represent remeasurements of REO. March 31, 2018 Three Months Ended March 31, 2018 Six Months Ended March 31, 2018 Level 1 Level 2 Level 3 Total Total Gains (Losses) (In thousands) (In thousands) Impaired loans (1) $ — $ — $ 7,343 $ 7,343 $ (466 ) $ (973 ) Real estate owned (2) — — 5,520 5,520 (379 ) (559 ) Balance at end of period $ — $ — $ 12,863 $ 12,863 $ (845 ) $ (1,532 ) (1) The gains (losses) represent remeasurements of collateral-dependent loans. (2) The gains (losses) represent remeasurements of REO. Impaired loans - The Company adjusts the carrying amount of impaired loans when there is evidence of probable loss and the expected fair value of the loan is less than its contractual amount. The amount of the impairment may be determined based on the estimated present value of future cash flows or the fair value of the underlying collateral. Impaired loans with a specific reserve allowance based on cash flow analysis or the value of the underlying collateral are classified as Level 3 assets. The evaluations for impairment are prepared by the Company's Problem Loan Review Committee, which is chaired by the Chief Credit Officer and includes the Loan Review manager and Special Credits manager, as well as senior credit officers, division managers and group executives, as applicable. These evaluations are performed in conjunction with the quarterly allowance for loan loss process. Applicable loans included in the previous quarter's review are reevaluated and if their values are materially different from the prior quarter evaluation, the underlying information (loan balance and collateral value) are compared. Material differences are evaluated for reasonableness and discussions are held between the relationship manager and their division manager to understand the difference and determine if any adjustment is necessary. The inputs are developed and substantiated on a quarterly basis, based on current borrower developments, market conditions and collateral values. The following methods are used to value impaired loans: • The fair value of the collateral, which may take the form of real estate or personal property, is based on internal estimates, field observations, assessments provided by third-party appraisers and other valuation models. The Company performs or reaffirms valuations of collateral-dependent impaired loans at least annually. Adjustments are made if management believes that more recent information is available and relevant with respect to the fair value of the collateral. • The present value of the expected future cash flows of the loans is used for measurement of non-collateral-dependent loans to test for impairment. Real estate owned - When a loan is reclassified from loan status to real estate owned due to the Company taking possession of the collateral, a special credits officer, along with the special credits manager, obtains a valuation, which may include appraisals or third-party price opinions, which is used to establish the fair value of the underlying collateral. The determined fair value, less selling costs, becomes the carrying value of the REO asset. The fair value of REO assets is re-evaluated quarterly and the REO asset is adjusted to reflect the fair value as necessary. After foreclosure, the valuations are updated periodically and current market conditions may require the assets to be written down further or up to the cost basis established on the date of transfer. The carrying balance of REO assets are also written down once a bona fide offer is contractually accepted, through execution of a purchase and sale agreement, where the accepted price is lower than the cost established on the transfer date. Fair Values of Financial Instruments FASB ASC 825 requires disclosure of fair value information about financial instruments, whether or not recognized on the statement of financial condition, for which it is practicable to estimate those values. Certain financial instruments and all non-financial instruments are excluded from the disclosure requirements. Accordingly, the aggregate fair value estimates presented do not reflect the underlying fair value of the Company. Although management is not aware of any factors that would materially affect the estimated fair value amounts presented below, such amounts have not been comprehensively revalued for purposes of these financial statements since the dates shown, and therefore, estimates of fair value subsequent to those dates may differ significantly from the amounts presented below. March 31, 2019 September 30, 2018 Level in Fair Value Hierarchy Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value ($ in thousands) Financial assets Cash and cash equivalents 1 $ 279,554 $ 279,554 $ 268,650 $ 268,650 Available-for-sale securities Equity securities 1 — — 488 488 U.S. government and agency securities 2 235,280 235,280 207,293 207,293 Municipal bonds 2 22,408 22,408 22,978 22,978 Corporate debt securities 2 257,981 257,981 184,695 184,695 Mortgage-backed securities Agency pass-through certificates 2 1,029,937 1,029,937 896,041 896,041 Commercial MBS 2 — — 3,462 3,462 Total available-for-sale securities 1,545,606 1,545,606 1,314,957 1,314,957 Held-to-maturity securities Mortgage-backed securities Agency pass-through certificates 2 1,538,683 1,520,608 1,610,420 1,533,742 Commercial MBS 2 15,000 14,944 15,000 15,028 Total held-to-maturity securities 1,553,683 1,535,552 1,625,420 1,548,770 Loans receivable 3 11,894,836 12,234,924 11,477,081 11,556,326 FHLB and FRB stock 2 138,390 138,390 127,190 127,190 Other assets - interest rate contracts 2 2,822 2,822 12,731 12,731 Other assets - commercial loan hedges 2 — — 3,857 3,857 Other assets - borrowings hedges 2 5,600 5,600 22,250 22,250 Financial liabilities Time deposit accounts 2 4,939,365 4,942,666 4,804,803 4,779,040 FHLB advances 2 2,610,000 2,590,365 2,330,000 2,316,964 Other liabilities - interest rate contracts 2 2,822 2,822 12,731 12,731 Other liabilities - commercial loan hedges 2 94 94 — — The following methods and assumptions were used to estimate the fair value of financial instruments: Cash and cash equivalents – The carrying amount of these items is a reasonable estimate of their fair value. Available-for-sale securities and held-to-maturity securities – Securities at fair value are primarily priced using model pricing based on the securities' relationship to other benchmark quoted prices as provided by an independent third party, and are considered a Level 2 input method. Equity securities that are exchange traded are considered a Level 1 input method. Loans receivable – Fair values are estimated first by stratifying the portfolios of loans with similar financial characteristics. Loans are segregated by type such as multi-family real estate, residential mortgage, construction, commercial, consumer and land loans. Each loan category is further segmented into fixed- and adjustable-rate interest terms. For residential mortgages and multi-family loans, the bank determined that its best exit price was by securitization. MBS benchmark prices are used as a base price, with further loan level pricing adjustments made based on individual loan characteristics such as Fico score, LTV, Property Type and occupancy. For all other loan categories an estimate of fair value is then calculated based on discounted cash flows using a discount rate offered and observed in the market on similar products, plus an adjustment for liquidity to reflect the non-homogeneous nature of the loans, as well as, a annual loss rate based on historical losses to arrive at an estimated exit price fair value. Fair value for impaired loans is also based on recent appraisals or estimated cash flows discounted using rates commensurate with risk associated with the estimated cash flows. Assumptions regarding credit risk, cash flows and discount rates are judgmentally determined using available market information and specific borrower information. FHLB and FRB stock – The fair value is based upon the par value of the stock that equates to its carrying value. Time deposit accounts – The fair value of certificates of deposit is estimated by discounting the estimated future cash flows using rates offered for deposits with similar remaining maturities. FHLB advances – The fair value of FHLB advances and other borrowings is estimated by discounting the estimated future cash flows using rates currently available to the Company for debt with similar remaining maturities. Interest rate contracts – The Company offers interest rate swaps to its variable rate borrowers who want to manage their interest rate risk. At the same time, the Company enters into the opposite trade with a counterparty to offset its interest rate risk. The fair value of these interest rate swaps is estimated by a third party pricing service using a discounted cash flow technique. Commercial loan hedges – The fair value of the interest rate swaps is estimated by a third party pricing service using a discounted cash flow technique. Borrowings hedges – The fair value of the interest rate swaps is estimated by a third party pricing service using a discounted cash flow technique. The following tables provide a reconciliation of amortized cost to fair value of available-for-sale and held-to-maturity securities. March 31, 2019 Amortized Cost Gross Unrealized Fair Value Yield Gains Losses ($ in thousands) Available-for-sale securities U.S. government and agency securities due 5 to 10 years $ 70,806 $ 2 $ (1,182 ) $ 69,626 2.75 % Over 10 years 166,674 38 (1,058 ) 165,654 3.55 Corporate debt securities due 1 to 5 years 113,832 1,402 (263 ) 114,971 3.92 5 to 10 years 142,776 808 (574 ) 143,010 3.49 Municipal bonds due 1 to 5 years 1,414 12 — 1,426 1.92 Over 10 years 20,313 669 — 20,982 6.45 Mortgage-backed securities Agency pass-through certificates 1,024,213 10,337 (4,613 ) 1,029,937 3.36 1,540,028 13,268 (7,690 ) 1,545,606 3.44 Held-to-maturity securities Mortgage-backed securities Agency pass-through certificates 1,538,683 3,599 (21,674 ) 1,520,608 3.16 Commercial MBS 15,000 — (56 ) 14,944 3.35 1,553,683 3,599 (21,730 ) 1,535,552 3.16 $ 3,093,711 $ 16,867 $ (29,420 ) $ 3,081,158 3.30 % September 30, 2018 Amortized Cost Gross Unrealized Fair Value Yield Gains Losses ($ in thousands) Available-for-sale securities U.S. government and agency securities due 5 to 10 years $ 60,872 $ — $ (1,473 ) $ 59,399 2.55 % Over 10 years 148,099 109 (314 ) 147,894 3.05 Equity securities 1 to 5 years 500 — (12 ) 488 1.80 Corporate bonds due 1 to 5 years 113,762 1,875 (13 ) 115,624 3.59 5 to 10 years 69,965 35 (929 ) 69,071 3.23 Municipal bonds due 1 to 5 years 1,398 — (24 ) 1,374 2.05 Over 10 years 20,323 1,281 — 21,604 6.45 Mortgage-backed securities Agency pass-through certificates 908,092 1,383 (13,434 ) 896,041 3.29 Commercial MBS 3,460 2 — 3,462 4.36 1,326,471 4,685 (16,199 ) 1,314,957 3.30 Held-to-maturity securities Mortgage-backed securities Agency pass-through certificates 1,610,420 305 (76,983 ) 1,533,742 3.16 Other Commercial MBS 15,000 28 — 15,028 3.03 1,625,420 333 (76,983 ) 1,548,770 3.16 $ 2,951,891 $ 5,018 $ (93,182 ) $ 2,863,727 3.22 % For available-for-sale investment securities, there were sales totaling $491,000 during the six months ended March 31, 2019 and no sales during the six months ended March 31, 2018 . There were purchases of $290,574,000 of available-for-sale investment securities during the six months ended March 31, 2019 and purchases of $123,324,000 during the six months ended March 31, 2018 . For held-to-maturity investment securities, there were no purchases during the six months ended March 31, 2019 and purchases of $170,836,000 during the six months ended March 31, 2018 . There were no sales of held-to-maturity investment securities during either period. Substantially all of the agency mortgage-backed securities have contractual due dates that exceed 10 years . The following tables show the unrealized gross losses and fair value of securities as of March 31, 2019 and September 30, 2018 , by length of time that individual securities in each category have been in a continuous loss position. The decline in fair value since purchase is attributable to changes in interest rates. Because the Company does not intend to sell these securities and does not consider it more likely than not that it will be required to sell these securities before the recovery of amortized cost basis, which may be upon maturity, the Company does not consider these investments to be other than temporarily impaired. March 31, 2019 Less than 12 months 12 months or more Total Unrealized Gross Losses Fair Value Unrealized Gross Losses Fair Value Unrealized Gross Losses Fair Value (In thousands) Corporate debt securities $ (574 ) $ 49,521 $ (263 ) $ 49,737 $ (837 ) 99,258 U.S. government and agency securities (621 ) 84,101 (1,619 ) 129,356 (2,240 ) 213,457 Mortgage-backed securities (418 ) 160,772 (25,925 ) 1,621,708 (26,343 ) 1,782,480 $ (1,613 ) $ 294,394 $ (27,807 ) $ 1,800,801 $ (29,420 ) $ 2,095,195 September 30, 2018 Less than 12 months 12 months or more Total Unrealized Gross Losses Fair Value Unrealized Gross Losses Fair Value Unrealized Gross Losses Fair Value (In thousands) Corporate debt securities $ (929 ) $ 49,072 $ (14 ) $ 24,988 $ (943 ) $ 74,060 Municipal bonds due (24 ) 1,374 — — (24 ) 1,374 U.S. government and agency securities (141 ) 37,565 (1,645 ) 76,499 (1,786 ) 114,064 Equity securities (12 ) 488 — — (12 ) 488 Mortgage-backed securities (28,748 ) 1,035,754 (61,669 ) 1,183,017 (90,417 ) 2,218,771 $ (29,854 ) $ 1,124,253 $ (63,328 ) $ 1,284,504 $ (93,182 ) $ 2,408,757

Derivatives and Hedging Activit

Derivatives and Hedging Activities	6 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	Derivatives and Hedging Activities On October 1, 2018, the Company early adopted ASU 2017-12, Targeted Improvements to Accounting for Hedge Activities . This standard primarily impacts the accounting for derivatives designated as fair value and cash flow accounting hedges. The following tables present the fair value, notional amount and balance sheet classification of derivative assets and liabilities at March 31, 2019 and September 30, 2018 : March 31, 2019 Derivatives Assets Derivative Liabilities Balance Sheet Location Notional Fair Value Balance Sheet Location Notional Fair Value (In thousands) (In thousands) Client swap program Other assets $ 398,666 $ 2,822 Other liabilities $ 398,666 $ 2,822 Commercial loan fair value hedges Other assets — — Other liabilities 95,645 94 Borrowings cash flow hedges Other assets 700,000 5,600 Other liabilities — — $ 1,098,666 $ 8,422 $ 494,311 $ 2,916 September 30, 2018 Derivatives Assets Derivative Liabilities Interest rate contract purpose Balance Sheet Location Notional Fair Value Balance Sheet Location Notional Fair Value (In thousands) (In thousands) Client swap program Other assets $ 395,396 $ 12,731 Other liabilities $ 395,396 $ 12,731 Commercial loan fair value hedges Other assets 97,927 3,857 Other liabilities — — Borrowings cash flow hedges Other assets 700,000 22,250 Other liabilities — — $ 1,193,323 $ 38,838 $ 395,396 $ 12,731 The Company enters into interest rate swaps to hedge the interest rate risk of individual fixed rate commercial loans and these relationships qualify as fair value hedges under ASC 815, which provides for offsetting of the recognition of gains and losses of the respective interest rate swap and the hedged item. Gains and losses on the interest rate swaps designated in these hedge relationships, along with the offsetting gains and losses on the hedged items attributable to the hedged risk, are recognized in current earnings within the same income statement line item. Upon electing to apply ASC 815 fair value hedge accounting, the carrying value of the hedged item is adjusted to reflect the cumulative impact of changes in fair value attributable to the hedged risk. The hedge basis adjustment remains with the hedged item until the hedged item is de-recognized from the balance sheet. The following table presents the impact of fair value hedge accounting on the carrying value of the hedged items (fixed rate commercial loans) at March 31, 2019 : (In thousands) March 31, 2019 Balance sheet line item in which hedged item is recorded Carrying value of hedged items Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items Loans receivable $ 95,770 $ (94 ) $ 95,770 $ (94 ) The Company has entered into interest rate swaps to convert certain short-term borrowings to fixed rate payments. The primary purpose of these hedges is to mitigate the risk of changes in future cash flows resulting from increasing interest rates. For qualifying cash flow hedges under ASC 815, gains and losses on the interest rate swaps are recorded in accumulated other comprehensive income ("AOCI") and then reclassified into earnings in the same period the hedged cash flows affect earnings and within the same income statement line item as the hedged cash flows. As of March 31, 2019 , the maturities for hedges of adjustable rate borrowings ranged from one to seven years , with the weighted average being 3.1 years . The following table presents the impact of derivative instruments (cash flow hedges on borrowings) on AOCI for the periods presented: (In thousands) Three Months Ended March 31, Amount of gain/(loss) recognized in AOCI on derivatives in cash flow hedging relationships 2019 Interest rate contracts: Pay fixed/receive floating swaps on cash flow hedges of borrowings $ (6,150 ) Total pre-tax gain/(loss) recognized in AOCI $ (6,150 ) (In thousands) Six Months Ended March 31, Amount of gain/(loss) recognized in AOCI on derivatives in cash flow hedging relationships 2019 Interest rate contracts: Pay fixed/receive floating swaps on cash flow hedges of borrowings $ (16,650 ) Total pre-tax gain/(loss) recognized in AOCI $ (16,650 ) The following table presents the gains/(losses) on derivative instruments in fair value and cash flow accounting hedging relationships under ASC 815 for the period presented: Three Months Ended March 31, 2019 Interest income on loans receivable Interest expense on FHLB advances (In thousands) Interest income/expense, including the effects of fair value and cash flow hedges $ 141,061 $ 17,846 Gain/(loss) on fair value hedging relationships: Interest rate contracts Amounts related to interest settlements on derivatives $ 58 Recognized on derivatives (1,600 ) Recognized on hedged items 1,602 Net income/(expense) recognized on fair value hedges $ 60 Gain/(loss) on cash flow hedging relationships: Interest rate contracts Amounts related to interest settlements on derivatives $ (854 ) Amount of derivative gain/(loss) reclassified from AOCI into interest income/expense — Net income/(expense) recognized on cash flow hedges $ (854 ) Six Months Ended March 31, 2019 Interest income on loans receivable Interest expense on FHLB advances (In thousands) Interest income/expense, including the effects of fair value and cash flow hedges $ 278,126 $ 34,737 Gain/(loss) on fair value hedging relationships: Interest rate contracts Amounts related to interest settlements on derivatives $ 77 Recognized on derivatives (3,917 ) Recognized on hedged items 3,881 Net income/(expense) recognized on fair value hedges $ 41 Gain/(loss) on cash flow hedging relationships: Interest rate contracts Amounts related to interest settlements on derivatives $ (1,404 ) Amount of derivative gain/(loss) reclassified from AOCI into interest income/expense — Net income/(expense) recognized on cash flow hedges $ (1,404 ) The Company periodically enters into certain interest rate swap agreements in order to provide commercial loan customers the ability to convert from variable to fixed interest rate payments, while the Company retains a variable rate loan. Under these agreements, the Company enters into a variable rate loan agreement and a swap agreement with the client. The swap agreement effectively converts the client’s variable rate loan into a fixed rate. The Company enters into a corresponding swap agreement with a third party in order to offset its exposure on the variable and fixed components of the client's swap agreement. The interest rate swaps are derivatives under FASB ASC 815, Derivatives and Hedging , with changes in fair value recorded in earnings. There was no net impact to the statement of operations for the six months ended March 31, 2019 and 2018 as the changes in fair value of the receive fixed swap and pay fixed swap offset each other. The following table presents the impact of derivative instruments (client swap program) that are not designated in accounting hedges under ASC 815 for the periods presented: (In thousands) Three Months Ended March 31, Derivative instruments Classification of gain/(loss) recognized in income on derivative instrument 2019 Interest rate contracts: Pay fixed/receive floating swap Other noninterest income $ (6,163 ) Receive fixed/pay floating swap Other noninterest income 6,163 $ — (In thousands) Six Months Ended March 31, Derivative instruments Classification of gain/(loss) recognized in income on derivative instrument 2019 Interest rate contracts: Pay fixed/receive floating swap Other noninterest income $ (15,553 ) Receive fixed/pay floating swap Other noninterest income 15,553 $ —

Revenue from Contracts with Cus

Revenue from Contracts with Customers	6 Months Ended
	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	Revenue from Contracts with Customers On October 1, 2018, the Company adopted ASU No. 2014-09, Revenue from Contracts with Customers ("ASC 606") . Since net interest income on financial assets and liabilities is excluded from this guidance, a significant majority of our revenues are not subject to the new guidance. Revenue streams that are within the scope of the new guidance are presented within noninterest income and are, in general, recognized as revenue at the same time the Company's obligation to the customer is satisfied. Most of the Company's customer contracts that are within the scope of the new guidance are cancelable by either party without penalty and are short-term in nature. These sources of revenue include depositor and other consumer and business banking fees, commission income, as well as debit and credit card interchange fees. For the six months ended March 31, 2019 , in scope revenue streams represented approximately 5.0% of our total revenues. As this standard is immaterial to our consolidated financial statements, the Company has omitted certain disclosures in ASC 606, including the disaggregation of revenue table. Sources of noninterest income within the scope of the new guidance include the following: Deposit related and other service charges (recognized in Deposit Fee Income) : The Company's deposit accounts are governed by standardized contracts customary in the industry. Revenues are earned at a point in time or over time (monthly) from account maintenance fees and charges for specific transactions such as wire transfers, stop payment orders, overdrafts, debit card replacements, check orders and cashier’s checks. The Company’s performance obligation related to each of these fees is generally satisfied, and the related revenue recognized, at the time the service is provided (point in time or monthly). The Company is principal in each of these contracts. Debit and Credit Card Interchange Fees (recognized in Deposit Fee Income) : The Company receives interchange fees from the debit card or credit card payment network based on transactions involving debit or credit cards issued by the Company, generally measured as a percentage of the underlying transaction. Interchange fees from debit and credit card transactions are recognized as the transaction processing services are provided by the network. The Company acts as an agent in the card payment network arrangement so the interchange fees are recorded net of any expenses paid to the principal (the card payment network in this case). Insurance Agency Commissions (recognized in Other Income) : WAFD Insurance Group, Inc. is a wholly-owned subsidiary of Washington Federal, N.A. that operates as an insurance agency, selling and marketing property and casualty insurance policies for a small number of high-quality insurance carriers. WAFD Insurance Group, Inc. earns revenue in the form of commissions paid by the insurance carriers for policies that have been sold. In addition to the origination commission, WAFD Insurance Group, Inc. may also receive contingent incentive fees based on the volume of business generated for the insurance carrier and based on policy renewal rates.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation	The Company has prepared the consolidated unaudited interim financial statements included in this report. All intercompany transactions and accounts have been eliminated in consolidation. The preparation of financial statements, in conformity with accounting principles generally accepted in the United States of America (“GAAP”), requires management to make estimates and assumptions that affect amounts reported in the financial statements. Actual results could differ from these estimates. In the opinion of management, all adjustments (consisting only of normal recurring adjustments) necessary for a fair presentation are reflected in the interim financial statements. Certain amounts in the financial statements from prior periods have been reclassified to conform to the current financial statement presentation. The information included in this Form 10-Q should be read in conjunction with the financial statements and related notes in the Company's 2018 Annual Report on Form 10-K (“ 2018 Annual Financial Statements”). Interim results are not necessarily indicative of results for a full year.
Equity Securities	The Company records equity securities within Other assets in its Consolidated Statements of Financial Condition. Investments in equity securities with readily determinable fair values (marketable) are measured at fair value, with changes in the fair value recognized as a component of Other income in the Consolidated Statements of Operations. Investments in equity investments that do not have readily determinable fair values (non-marketable) are accounted for at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or similar investment of the same issuer, also referred to as the measurement alternative. Any adjustments to the carrying value of these investments are recorded in Other income in the Consolidated Statements of Operations.
Off-Balance-Sheet Credit Exposures	The Company estimates losses on off-balance-sheet credit exposures by allocating a loss percentage derived from historical loss factors for each asset class.
New Accounting Pronouncements	In April 2019, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2019-04, Codification Improvements to Topic 326, Financial Instruments-Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments, that clarifies and improves areas of guidance related to the recently issued standards on credit losses (ASU 2016-13), hedging (ASU 2017-12), and recognition and measurement of financial instruments (ASU 2016-01). The amendments generally have the same effective dates as their related standards. If already adopted, the amendments of ASU 2016-01 and ASU 2016-13 are effective for fiscal years beginning after December 15, 2019 and the amendments of ASU 2017-12 are effective as of the beginning of the Company’s next annual reporting period; early adoption is permitted. The Company previously adopted both ASU 2017-12 and ASU 2016-01 and does not expect the amendments of ASU 2019-04 will have a material impact on its consolidated financial statements. The Company is continuing to evaluate the impact of ASU 2016-13 and will consider the amendments of ASU 2019-04 as part of that process. In August 2018, the FASB issued ASU 2018-15, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract . The amendments in this ASU align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The amendments also require the entity to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement, including reasonably certain renewal periods. The amendments in the ASU are effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years. Early adoption is permitted, including adoption in any interim period. The Company is assessing the impact that this guidance will have on its consolidated financial statements. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement . This ASU adds, eliminates, and modifies certain disclosure requirements for fair value measurements. Among the changes, entities will no longer be required to disclose the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, but will be required to disclose the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements. The ASU is effective for interim and annual reporting periods beginning after December 15, 2019; early adoption is permitted. Entities are also allowed to elect early adoption of the eliminated or modified disclosure requirements and delay adoption of the added disclosure requirements until their effective date. As the ASU only revises disclosure requirements, this guidance will not have a material impact on the Company's consolidated financial statements. In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842) - Targeted Improvements to provide entities with relief from the costs of implementing certain aspects of the new leasing standard, ASU No. 2016-02. Specifically, under the amendments in ASU 2018-11: (1) entities may elect not to recast the comparative periods presented when transitioning to the new leasing standard, and (2) lessors may elect to not separate non-lease components from leases when certain conditions are met. The amendments have the same effective date as ASU 2016-02 (October 1, 2019 for the Company). The Company expects to elect both transition options. ASU 2018-11 is not expected to have a material impact on the Company's consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses . The amendments in this ASU were issued to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments that are not accounted for at fair value through net income, including loans held for investment, held-to-maturity debt securities, trade and other receivables, net investments in leases and other commitments to extend credit held by a reporting entity at each reporting date. The amendments require that financial assets measured at amortized cost be presented at the net amount expected to be collected, through an allowance for credit losses that is deducted from the amortized cost basis. The ASU eliminates the current framework of recognizing probable incurred losses and instead requires an entity to use its current estimate of all expected credit losses over the contractual life. The measurement of expected credit losses is based upon historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the financial assets. For purchased financial assets with a more-than-insignificant amount of credit deterioration since origination (“PCD assets”) that are measured at amortized cost, an allowance for expected credit losses is recorded as an adjustment to the cost basis of the asset. Subsequent changes in estimated cash flows would be recorded as an adjustment to the allowance and through the statement of income. Credit losses relating to available-for-sale debt securities will be recorded through an allowance for credit losses rather than as a direct write-down to the security's cost basis. The amendments in this ASU are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. For most debt securities, the transition approach requires a cumulative-effect adjustment to the statement of financial position as of the beginning of the first reporting period the guidance is effective. For other-than-temporarily impaired debt securities and PCD assets, the guidance will be applied prospectively. While the Company is currently in the process of evaluating the impact of the amended guidance on its consolidated financial statements, it currently expects the ALLL to increase upon adoption given that the allowance will be required to cover the full remaining expected life of the portfolio upon adoption, rather than the incurred loss model under current U.S. GAAP. The extent of this increase is still being evaluated and will depend on economic conditions and the composition of the Company’s loan and lease portfolio at the time of adoption. In February 2016, the FASB issued ASU 2016-02, Leases . The ASU, as amended, requires lessees to recognize a lease liability, which is a lessee's obligation to make lease payments arising from a lease, and a right-of-use asset, which is an asset that represents the lessee's right to use, or control the use of, a specified asset for the lease term. The guidance also simplifies the accounting for sale and leaseback transactions and introduces new disclosure requirements for leasing arrangements. Accounting by lessors is largely unchanged. The amendments are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company will adopt the standard effective October 1, 2019. Lessees (for capital and operating leases) and lessors (for sales-type, direct financing, and operating leases) must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The modified retrospective approach would not require any transition accounting for leases that expired before the earliest comparative period presented. The Company leases a number of properties under non-cancelable operating leases which will be subject to this ASU. We do not expect a material impact to our Consolidated Statement of Operations as a result of this ASU. While the Company has not quantified the impact to its Consolidated Statement of Condition, the Company expects to recognize right-of-use assets and lease liabilities for substantially all of its operating lease commitments based on the present value of unpaid lease payments as of the date of adoption. For information on the Company's future minimum lease payments, refer to Note I Premises and Equipment in our Annual Report on Form 10-K for the year ended September 30, 2018.

Loans Receivable (Tables)

Loans Receivable (Tables)	6 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Schedule of Loans Receivable	The following table is a summary of loans receivable. March 31, 2019 September 30, 2018 (In thousands) (In thousands) Gross loans by category Single-family residential $ 5,861,404 44.3 % $ 5,798,966 45.1 % Construction 1,980,274 15.0 1,890,668 14.7 Construction - custom 586,515 4.4 624,479 4.9 Land - acquisition & development 194,739 1.5 155,204 1.2 Land - consumer lot loans 97,152 0.7 102,036 0.8 Multi-family 1,423,723 10.7 1,385,125 10.8 Commercial real estate 1,570,502 11.9 1,452,168 11.3 Commercial & industrial 1,230,888 9.3 1,140,874 8.9 HELOC 139,203 1.0 130,852 1.0 Consumer 156,002 1.2 173,306 1.3 Total gross loans 13,240,402 100 % 12,853,678 100 % Less: Allowance for loan losses 133,086 129,257 Loans in process 1,162,787 1,195,506 Net deferred fees, costs and discounts 49,693 51,834 Total loan contra accounts 1,345,566 1,376,597 Net loans $ 11,894,836 $ 11,477,081
Summary of Information Regarding Non-Accrual Loans	The following table sets forth information regarding non-accrual loans. March 31, 2019 September 30, 2018 (In thousands, except ratio data) Non-accrual loans: Single-family residential $ 24,474 50.0 % $ 27,643 49.6 % Construction 1,282 2.6 2,427 4.4 Land - acquisition & development 242 0.5 920 1.7 Land - consumer lot loans 579 1.2 787 1.4 Commercial real estate 9,162 18.7 8,971 16.1 Commercial & industrial 12,366 25.3 14,394 25.8 HELOC 812 1.7 523 0.9 Consumer 24 — 21 — Total non-accrual loans $ 48,941 100 % $ 55,686 100 % % of total net loans 0.41 % 0.49 %
Analysis of Age of Loans in Past Due Status	The following tables provide details regarding delinquent loans. March 31, 2019 Loans Receivable Days Delinquent Based on $ Amount of Loans % based on $ Type of Loan Net of Loans In Process Current 30 60 90 Total Delinquent (In thousands, except ratio data) Single-family residential $ 5,860,365 $ 5,830,848 $ 10,018 $ 2,672 $ 16,827 $ 29,517 0.50 % Construction 1,139,970 1,138,688 — — 1,282 1,282 0.11 Construction - custom 307,405 306,929 — 476 — 476 0.15 Land - acquisition & development 152,546 152,394 152 — — 152 0.10 Land - consumer lot loans 97,033 96,278 502 — 253 755 0.78 Multi-family 1,423,701 1,422,270 1,431 — — 1,431 0.10 Commercial real estate 1,570,502 1,566,393 743 — 3,366 4,109 0.26 Commercial & industrial 1,230,888 1,221,571 311 — 9,006 9,317 0.76 HELOC 139,203 137,982 388 229 604 1,221 0.88 Consumer 156,002 155,749 91 16 146 253 0.16 Total Loans $ 12,077,615 $ 12,029,102 $ 13,636 $ 3,393 $ 31,484 $ 48,513 0.40 % Delinquency % 99.60% 0.11% 0.03% 0.26% 0.40% September 30, 2018 Loans Receivable Days Delinquent Based on $ Amount of Loans % based on $ Type of Loan Net of Loans In Process Current 30 60 90 Total Delinquent (In thousands, except ratio data) Single-family residential $ 5,798,353 $ 5,768,253 $ 7,983 $ 3,562 $ 18,555 $ 30,100 0.52 % Construction 1,062,855 1,060,428 — — 2,427 2,427 0.23 Construction - custom 289,192 289,192 — — — — — Land - acquisition & development 123,560 122,620 — 270 670 940 0.76 Land - consumer lot loans 101,908 101,294 144 117 353 614 0.60 Multi-family 1,385,103 1,385,103 — — — — — Commercial real estate 1,452,169 1,448,946 316 1,767 1,140 3,223 0.22 Commercial & industrial 1,140,874 1,130,836 — — 10,038 10,038 0.88 HELOC 130,852 129,510 567 469 306 1,342 1.03 Consumer 173,306 172,777 172 328 29 529 0.31 Total Loans $ 11,658,172 $ 11,608,959 $ 9,182 $ 6,513 $ 33,518 $ 49,213 0.42 % Delinquency % 99.58% 0.08% 0.06% 0.29% 0.42%
Schedule of Impaired Loans, Loan Commitments and Loans Serviced	The following table provides information related to loans restructured in a troubled debt restructuring ("TDR") during the periods presented: Three Months Ended March 31, 2019 2018 Pre-Modification Post-Modification Pre-Modification Post-Modification Outstanding Outstanding Outstanding Outstanding Number of Recorded Recorded Number of Recorded Recorded Contracts Investment Investment Contracts Investment Investment ($ in thousands) ($ in thousands) Troubled Debt Restructurings: Single-family residential 2 $ 39 $ 39 12 $ 2,183 $ 2,183 Land - consumer lot loans 1 40 40 — — — 3 $ 79 $ 79 12 $ 2,183 $ 2,183 Six Months Ended March 31, 2019 2018 Pre-Modification Post-Modification Pre-Modification Post-Modification Outstanding Outstanding Outstanding Outstanding Number of Recorded Recorded Number of Recorded Recorded Contracts Investment Investment Contracts Investment Investment ($ in thousands) ($ in thousands) Troubled Debt Restructurings: Single-family residential 3 $ 323 $ 323 20 $ 4,195 $ 4,195 Land - consumer lot loans 1 40 40 — — — Commercial & Industrial — — — 3 7,256 7,256 4 $ 363 $ 363 23 $ 11,451 $ 11,451
Schedule of Loan Modifications	The following table provides information on payment defaults occurring during the periods presented where the loan had been modified in a TDR within 12 months of the payment default. Three Months Ended March 31, 2019 2018 Number of Recorded Number of Recorded Contracts Investment Contracts Investment ($ in thousands) ($ in thousands) Trouble Debt Restructurings That Subsequently Defaulted: Single-family residential 4 $ 755 1 $ 162 4 $ 755 1 $ 162 Six Months Ended March 31, 2019 2018 Number of Recorded Number of Recorded Contracts Investment Contracts Investment ($ in thousands) ($ in thousands) Trouble Debt Restructurings That Subsequently Defaulted: Single-family residential 5 $ 1,298 2 $ 206 5 $ 1,298 2 $ 206

Allowance for Losses on Loans (

Allowance for Losses on Loans (Tables)	6 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Summary of Activity in Allowance for Loan Losses	The following tables summarize the activity in the allowance for loan losses. Three Months Ended March 31, 2019 Beginning Allowance Charge-offs Recoveries Provision & Transfers Ending Allowance (In thousands) Single-family residential $ 31,484 $ (150 ) $ 310 $ (168 ) $ 31,476 Construction 31,463 — — 1,933 33,396 Construction - custom 1,926 — — 50 1,976 Land - acquisition & development 9,156 — 1,300 (722 ) 9,734 Land - consumer lot loans 2,144 (48 ) — (20 ) 2,076 Multi-family 7,884 — — (490 ) 7,394 Commercial real estate 12,711 — 244 (507 ) 12,448 Commercial & industrial 30,279 (285 ) 24 556 30,574 HELOC 1,064 (200 ) 43 175 1,082 Consumer 3,054 (332 ) 265 (57 ) 2,930 $ 131,165 $ (1,015 ) $ 2,186 $ 750 $ 133,086 Three Months Ended March 31, 2018 Beginning Allowance Charge-offs Recoveries Provision & Transfers Ending Allowance (In thousands) Single-family residential $ 35,928 $ (290 ) $ 211 $ (1,705 ) $ 34,144 Construction 25,214 — — 2,175 27,389 Construction - custom 2,052 — — 29 2,081 Land - acquisition & development 7,355 — 1,207 (940 ) 7,622 Land - consumer lot loans 2,906 (18 ) — (35 ) 2,853 Multi-family 7,904 — — 78 7,982 Commercial real estate 11,625 (36 ) 1 (2 ) 11,588 Commercial & industrial 29,268 — 115 (53 ) 29,330 HELOC 808 (1 ) — (5 ) 802 Consumer 4,095 (94 ) 276 (492 ) 3,785 $ 127,155 $ (439 ) $ 1,810 $ (950 ) $ 127,576 Six Months Ended March 31, 2019 Beginning Allowance Charge-offs Recoveries Provision & Transfers Ending Allowance (In thousands) Single-family residential $ 33,033 $ (175 ) $ 539 $ (1,921 ) $ 31,476 Construction 31,317 — — 2,079 33,396 Construction - custom 1,842 — — 134 1,976 Land - acquisition & development 7,978 — 3,082 (1,326 ) 9,734 Land - consumer lot loans 2,164 (120 ) 265 (233 ) 2,076 Multi-family 8,329 — — (935 ) 7,394 Commercial real estate 11,852 (339 ) 770 165 12,448 Commercial & industrial 28,702 (464 ) 58 2,278 30,574 HELOC 781 (1,086 ) 44 1,343 1,082 Consumer 3,259 (472 ) 477 (334 ) 2,930 $ 129,257 $ (2,656 ) $ 5,235 $ 1,250 $ 133,086 Six Months Ended March 31, 2018 Beginning Allowance Charge-offs Recoveries Provision & Transfers Ending Allowance (In thousands) Single-family residential $ 36,892 $ (750 ) $ 331 $ (2,329 ) $ 34,144 Construction 24,556 — — 2,833 27,389 Construction - custom 1,944 (50 ) — 187 2,081 Land - acquisition & development 6,829 — 4,579 (3,786 ) 7,622 Land - consumer lot loans 2,649 (66 ) — 270 2,853 Multi-family 7,862 — — 120 7,982 Commercial real estate 11,818 (36 ) 1 (195 ) 11,588 Commercial & industrial 28,524 (116 ) 170 752 29,330 HELOC 855 (1 ) 1 (53 ) 802 Consumer 1,144 (172 ) 562 2,251 3,785 $ 123,073 $ (1,191 ) $ 5,644 $ 50 $ 127,576
Summary of Loans Collectively and Individually Evaluated for Impairment and Related Allocation of Reserves	The following tables show loans collectively and individually evaluated for impairment and the related allocation of general and specific reserves. March 31, 2019 Loans Collectively Evaluated for Impairment Loans Individually Evaluated for Impairment Allowance Allocation Recorded Investment of Loans Ratio Allowance Allocation Recorded Investment of Loans Ratio (In thousands, except ratio data) (In thousands, except ratio data) Single-family residential $ 31,476 $ 5,848,663 0.5 % $ — $ 16,836 — % Construction 33,396 1,138,688 2.9 — 1,282 — Construction - custom 1,976 307,405 0.6 — — — Land - acquisition & development 9,727 152,304 6.4 7 242 2.9 Land - consumer lot loans 2,076 92,614 2.2 — 309 — Multi-family 7,390 1,422,864 0.5 4 837 0.5 Commercial real estate 12,328 1,552,990 0.8 120 17,512 0.7 Commercial & industrial 30,329 1,219,921 2.5 245 12,651 1.9 HELOC 1,082 137,716 0.8 — 528 — Consumer 2,930 154,201 1.9 — 52 — $ 132,710 $ 12,027,366 1.1 % $ 376 $ 50,249 0.7 % September 30, 2018 Loans Collectively Evaluated for Impairment Loans Individually Evaluated for Impairment Allowance Allocation Recorded Investment of Loans Ratio Allowance Allocation Recorded Investment of Loans Ratio (In thousands, except ratio data) (In thousands, except ratio data) Single-family residential $ 33,033 $ 5,782,870 0.6 % $ — $ 21,345 — % Construction 31,317 1,060,428 3.0 — 2,427 — Construction - custom 1,842 289,192 0.6 — — — Land - acquisition & development 7,969 122,639 6.5 9 920 1.0 Land - consumer lot loans 2,164 96,583 2.2 — 507 — Multi-family 8,325 1,384,655 0.6 4 448 1.0 Commercial real estate 11,702 1,432,791 0.8 150 19,378 0.8 Commercial & industrial 28,348 1,126,438 2.5 354 14,437 2.5 HELOC 781 128,715 0.6 — 1,162 — Consumer 3,259 173,181 1.9 — 56 — $ 128,740 $ 11,597,492 1.1 % $ 517 $ 60,680 0.9 %
Summary of Loans Based on Credit Quality Indicators	The following tables provide information on loans based on risk rating categories as defined above. March 31, 2019 Internally Assigned Grade Pass Special mention Substandard Doubtful Loss Total Gross Loans (In thousands, except ratio data) Loan type Single-family residential $ 5,831,775 $ — $ 29,629 $ — $ — $ 5,861,404 Construction 1,978,992 — 1,282 — — 1,980,274 Construction - custom 586,515 — — — — 586,515 Land - acquisition & development 190,807 2,424 1,508 — — 194,739 Land - consumer lot loans 96,573 — 579 — — 97,152 Multi-family 1,415,872 — 7,851 — — 1,423,723 Commercial real estate 1,529,461 7,599 33,442 — — 1,570,502 Commercial & industrial 1,195,835 4,238 30,815 — — 1,230,888 HELOC 138,391 — 812 — — 139,203 Consumer 155,978 — 24 — — 156,002 Total gross loans $ 13,120,199 $ 14,261 $ 105,942 $ — $ — $ 13,240,402 Total grade as a % of total gross loans 99.1 % 0.1 % 0.8 % — % — % September 30, 2018 Internally Assigned Grade Pass Special mention Substandard Doubtful Loss Total Gross Loans (In thousands, except ratio data) Loan type Single-family residential $ 5,766,096 $ — $ 32,870 $ — $ — $ 5,798,966 Construction 1,886,304 1,937 2,427 — — 1,890,668 Construction - custom 624,479 — — — — 624,479 Land - acquisition & development 152,984 — 2,220 — — 155,204 Land - consumer lot loans 101,249 — 787 — — 102,036 Multi-family 1,378,803 1,633 4,689 — — 1,385,125 Commercial real estate 1,421,602 7,114 23,452 — — 1,452,168 Commercial & industrial 1,093,405 16,513 30,956 — — 1,140,874 HELOC 130,330 — 522 — — 130,852 Consumer 173,285 — 21 — — 173,306 Total gross loans $ 12,728,537 $ 27,197 $ 97,944 $ — $ — $ 12,853,678 Total grade as a % of total gross loans 99.0 % 0.2 % 0.8 % — % — % The following tables provide information on gross loans based on borrower payment activity. March 31, 2019 Performing Loans Non-Performing Loans Amount % of Total Gross Loans Amount % of Total Gross Loans (In thousands, except ratio data) Single-family residential $ 5,836,930 99.6 % $ 24,474 0.4 % Construction 1,978,992 99.9 1,282 0.1 Construction - custom 586,515 100.0 — — Land - acquisition & development 194,497 99.9 242 0.1 Land - consumer lot loans 96,573 99.4 579 0.6 Multi-family 1,423,723 100.0 — — Commercial real estate 1,561,340 99.4 9,162 0.6 Commercial & industrial 1,218,522 99.0 12,366 1.0 HELOC 138,391 99.4 812 0.6 Consumer 155,978 100.0 24 — $ 13,191,461 99.6 % $ 48,941 0.4 % September 30, 2018 Performing Loans Non-Performing Loans Amount % of Total Gross Loans Amount % of Total Gross Loans (In thousands, except ratio data) Single-family residential $ 5,771,323 99.5 % $ 27,643 0.5 % Construction 1,888,241 99.9 2,427 0.1 Construction - custom 624,479 100.0 — — Land - acquisition & development 154,284 99.4 920 0.6 Land - consumer lot loans 101,249 99.2 787 0.8 Multi-family 1,385,125 100.0 — — Commercial real estate 1,443,197 99.4 8,971 0.6 Commercial & industrial 1,126,480 98.7 14,394 1.3 HELOC 130,329 99.6 523 0.4 Consumer 173,285 100.0 21 — $ 12,797,992 99.6 % $ 55,686 0.4 %
Summary of Impaired Loans Based on Type	The following tables provide information on impaired loan balances and the related allowances by loan types. March 31, 2019 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment (Year-To-Date) (In thousands) Impaired loans with no related allowance recorded: Single-family residential $ 16,089 $ 16,964 $ — $ 16,800 Construction 1,532 1,750 — 1,953 Land - acquisition & development 143 143 — 431 Land - consumer lot loans 135 165 — 209 Commercial real estate 8,757 13,482 — 9,376 Commercial & industrial 9,006 9,321 — 9,670 HELOC 528 528 — 486 Consumer 22 88 — 22 36,212 42,441 — 38,947 Impaired loans with an allowance recorded: Single-family residential 126,265 129,043 2,202 133,290 Land - acquisition & development 99 154 — 103 Land - consumer lot loans 4,489 4,946 7 4,669 Multi-family 419 419 4 434 Commercial real estate 4,942 6,051 120 5,583 Commercial & industrial 3,360 6,830 245 3,937 HELOC 960 972 — 968 Consumer 65 65 — 67 140,599 148,480 2,578 (1) 149,051 Total impaired loans: Single-family residential 142,354 146,007 2,202 150,090 Construction 1,532 1,750 — 1,953 Land - acquisition & development 242 297 — 534 Land - consumer lot loans 4,624 5,111 7 4,878 Multi-family 419 419 4 434 Commercial real estate 13,699 19,533 120 14,959 Commercial & industrial 12,366 16,151 245 13,607 HELOC 1,488 1,500 — 1,454 Consumer 87 153 — 89 $ 176,811 $ 190,921 $ 2,578 (1) $ 187,998 (1) Includes $376,000 of specific reserves and $2,202,000 included in the general reserves. September 30, 2018 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment (In thousands) Impaired loans with no related allowance recorded: Single-family residential $ 18,872 $ 20,050 $ — $ 20,097 Construction 2,698 2,818 — 1,349 Construction - custom — — — 74 Land - acquisition & development 814 814 — 572 Land - consumer lot loans 311 336 — 260 Multi-family — — — 70 Commercial real estate 9,425 14,035 — 11,158 Commercial & industrial 10,137 10,146 — 9,208 HELOC 410 1,170 — 450 Consumer 20 56 — 54 42,687 49,425 — 43,292 Impaired loans with an allowance recorded: Single-family residential 139,796 143,099 2,871 161,729 Land - acquisition & development 107 157 — 39 Land - consumer lot loans 4,916 5,290 9 6,449 Multi-family 448 448 4 471 Commercial real estate 6,254 7,733 150 10,445 Commercial & industrial 4,291 7,506 354 4,495 HELOC 976 984 — 1,395 Consumer 70 70 — 83 156,858 165,287 3,388 (1) 185,106 Total impaired loans: Single-family residential 158,668 163,149 2,871 181,826 Construction 2,698 2,818 — 1,349 Construction - custom — — — 74 Land - acquisition & development 921 971 — 611 Land - consumer lot loans 5,227 5,626 9 6,709 Multi-family 448 448 4 541 Commercial real estate 15,679 21,768 150 21,603 Commercial & industrial 14,428 17,652 354 13,703 HELOC 1,386 2,154 — 1,845 Consumer 90 126 — 137 $ 199,545 $ 214,712 $ 3,388 (1) $ 228,398 (1) Includes $517,000 of specific reserves and $2,871,000 included in the general reserves.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value of Assets Measured on Recurring Basis	The following tables present the balance of assets and liabilities measured at fair value on a recurring basis. March 31, 2019 Level 1 Level 2 Level 3 Total (In thousands) Financial Assets Available-for-sale securities: U.S. government and agency securities $ — $ 235,280 $ — $ 235,280 Municipal bonds — 22,408 — 22,408 Corporate debt securities — 257,981 — 257,981 Mortgage-backed securities Agency pass-through certificates — 1,029,937 — 1,029,937 Total available-for-sale securities — 1,545,606 — 1,545,606 Interest rate contracts — 2,822 — 2,822 Borrowings hedges — 5,600 — 5,600 Total financial assets $ — $ 1,554,028 $ — $ 1,554,028 Financial Liabilities Interest rate contracts $ — $ 2,822 $ — $ 2,822 Commercial loan hedges — 94 — 94 Total financial liabilities $ — $ 2,916 $ — $ 2,916 There were no transfers between, into and/or out of Levels 1, 2 or 3 during the six months ended March 31, 2019 . September 30, 2018 Level 1 Level 2 Level 3 Total (In thousands) Financial Assets Available-for-sale securities: Equity securities $ 488 $ — $ — $ 488 U.S. government and agency securities — 207,293 — 207,293 Municipal bonds — 22,978 — 22,978 Corporate debt securities — 184,695 — 184,695 Mortgage-backed securities Agency pass-through certificates — 896,041 — 896,041 Commercial MBS — 3,462 — 3,462 Total available-for-sale securities 488 1,314,469 — 1,314,957 Interest rate contracts — 12,731 — 12,731 Commercial loan hedges — 3,857 — 3,857 Borrowings hedges — 22,250 — 22,250 Total financial assets $ 488 $ 1,353,307 $ — $ 1,353,795 Financial Liabilities Interest rate contracts $ — $ 12,731 $ — $ 12,731 Total financial liabilities $ — $ 12,731 $ — $ 12,731
Aggregated Balance of Assets Measured at Estimated Fair Value on a Nonrecurring Basis and Total Losses Resulting from Those Fair Value Adjustments	The following tables present the aggregated balance of assets that were measured at fair value on a nonrecurring basis at March 31, 2019 and March 31, 2018 , and the total gains (losses) resulting from those fair value adjustments for the three and six months ended March 31, 2019 and March 31, 2018 . The estimated fair value measurements are shown gross of estimated selling costs. March 31, 2019 Three Months Ended March 31, 2019 Six Months Ended March 31, 2019 Level 1 Level 2 Level 3 Total Total Gains (Losses) (In thousands) (In thousands) Impaired loans (1) $ — $ — $ 3,316 $ 3,316 $ (511 ) $ (1,237 ) Real estate owned (2) — — 2,550 2,550 431 399 Balance at end of period $ — $ — $ 5,866 $ 5,866 $ (80 ) $ (838 ) (1) The gains (losses) represent remeasurements of collateral-dependent loans. (2) The gains (losses) represent remeasurements of REO. March 31, 2018 Three Months Ended March 31, 2018 Six Months Ended March 31, 2018 Level 1 Level 2 Level 3 Total Total Gains (Losses) (In thousands) (In thousands) Impaired loans (1) $ — $ — $ 7,343 $ 7,343 $ (466 ) $ (973 ) Real estate owned (2) — — 5,520 5,520 (379 ) (559 ) Balance at end of period $ — $ — $ 12,863 $ 12,863 $ (845 ) $ (1,532 ) (1) The gains (losses) represent remeasurements of collateral-dependent loans. (2) The gains (losses) represent remeasurements of REO.
Fair Value of Financial Instruments by Balance Sheet Grouping	Although management is not aware of any factors that would materially affect the estimated fair value amounts presented below, such amounts have not been comprehensively revalued for purposes of these financial statements since the dates shown, and therefore, estimates of fair value subsequent to those dates may differ significantly from the amounts presented below. March 31, 2019 September 30, 2018 Level in Fair Value Hierarchy Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value ($ in thousands) Financial assets Cash and cash equivalents 1 $ 279,554 $ 279,554 $ 268,650 $ 268,650 Available-for-sale securities Equity securities 1 — — 488 488 U.S. government and agency securities 2 235,280 235,280 207,293 207,293 Municipal bonds 2 22,408 22,408 22,978 22,978 Corporate debt securities 2 257,981 257,981 184,695 184,695 Mortgage-backed securities Agency pass-through certificates 2 1,029,937 1,029,937 896,041 896,041 Commercial MBS 2 — — 3,462 3,462 Total available-for-sale securities 1,545,606 1,545,606 1,314,957 1,314,957 Held-to-maturity securities Mortgage-backed securities Agency pass-through certificates 2 1,538,683 1,520,608 1,610,420 1,533,742 Commercial MBS 2 15,000 14,944 15,000 15,028 Total held-to-maturity securities 1,553,683 1,535,552 1,625,420 1,548,770 Loans receivable 3 11,894,836 12,234,924 11,477,081 11,556,326 FHLB and FRB stock 2 138,390 138,390 127,190 127,190 Other assets - interest rate contracts 2 2,822 2,822 12,731 12,731 Other assets - commercial loan hedges 2 — — 3,857 3,857 Other assets - borrowings hedges 2 5,600 5,600 22,250 22,250 Financial liabilities Time deposit accounts 2 4,939,365 4,942,666 4,804,803 4,779,040 FHLB advances 2 2,610,000 2,590,365 2,330,000 2,316,964 Other liabilities - interest rate contracts 2 2,822 2,822 12,731 12,731 Other liabilities - commercial loan hedges 2 94 94 — —
Reconciliation of Amortized Cost to Fair Value of Available-for-Sale and Held-to-Maturity Securities	The following tables provide a reconciliation of amortized cost to fair value of available-for-sale and held-to-maturity securities. March 31, 2019 Amortized Cost Gross Unrealized Fair Value Yield Gains Losses ($ in thousands) Available-for-sale securities U.S. government and agency securities due 5 to 10 years $ 70,806 $ 2 $ (1,182 ) $ 69,626 2.75 % Over 10 years 166,674 38 (1,058 ) 165,654 3.55 Corporate debt securities due 1 to 5 years 113,832 1,402 (263 ) 114,971 3.92 5 to 10 years 142,776 808 (574 ) 143,010 3.49 Municipal bonds due 1 to 5 years 1,414 12 — 1,426 1.92 Over 10 years 20,313 669 — 20,982 6.45 Mortgage-backed securities Agency pass-through certificates 1,024,213 10,337 (4,613 ) 1,029,937 3.36 1,540,028 13,268 (7,690 ) 1,545,606 3.44 Held-to-maturity securities Mortgage-backed securities Agency pass-through certificates 1,538,683 3,599 (21,674 ) 1,520,608 3.16 Commercial MBS 15,000 — (56 ) 14,944 3.35 1,553,683 3,599 (21,730 ) 1,535,552 3.16 $ 3,093,711 $ 16,867 $ (29,420 ) $ 3,081,158 3.30 % September 30, 2018 Amortized Cost Gross Unrealized Fair Value Yield Gains Losses ($ in thousands) Available-for-sale securities U.S. government and agency securities due 5 to 10 years $ 60,872 $ — $ (1,473 ) $ 59,399 2.55 % Over 10 years 148,099 109 (314 ) 147,894 3.05 Equity securities 1 to 5 years 500 — (12 ) 488 1.80 Corporate bonds due 1 to 5 years 113,762 1,875 (13 ) 115,624 3.59 5 to 10 years 69,965 35 (929 ) 69,071 3.23 Municipal bonds due 1 to 5 years 1,398 — (24 ) 1,374 2.05 Over 10 years 20,323 1,281 — 21,604 6.45 Mortgage-backed securities Agency pass-through certificates 908,092 1,383 (13,434 ) 896,041 3.29 Commercial MBS 3,460 2 — 3,462 4.36 1,326,471 4,685 (16,199 ) 1,314,957 3.30 Held-to-maturity securities Mortgage-backed securities Agency pass-through certificates 1,610,420 305 (76,983 ) 1,533,742 3.16 Other Commercial MBS 15,000 28 — 15,028 3.03 1,625,420 333 (76,983 ) 1,548,770 3.16 $ 2,951,891 $ 5,018 $ (93,182 ) $ 2,863,727 3.22 %
Schedule of Unrealized Losses and Fair Value of Securities	The following tables show the unrealized gross losses and fair value of securities as of March 31, 2019 and September 30, 2018 , by length of time that individual securities in each category have been in a continuous loss position. The decline in fair value since purchase is attributable to changes in interest rates. Because the Company does not intend to sell these securities and does not consider it more likely than not that it will be required to sell these securities before the recovery of amortized cost basis, which may be upon maturity, the Company does not consider these investments to be other than temporarily impaired. March 31, 2019 Less than 12 months 12 months or more Total Unrealized Gross Losses Fair Value Unrealized Gross Losses Fair Value Unrealized Gross Losses Fair Value (In thousands) Corporate debt securities $ (574 ) $ 49,521 $ (263 ) $ 49,737 $ (837 ) 99,258 U.S. government and agency securities (621 ) 84,101 (1,619 ) 129,356 (2,240 ) 213,457 Mortgage-backed securities (418 ) 160,772 (25,925 ) 1,621,708 (26,343 ) 1,782,480 $ (1,613 ) $ 294,394 $ (27,807 ) $ 1,800,801 $ (29,420 ) $ 2,095,195 September 30, 2018 Less than 12 months 12 months or more Total Unrealized Gross Losses Fair Value Unrealized Gross Losses Fair Value Unrealized Gross Losses Fair Value (In thousands) Corporate debt securities $ (929 ) $ 49,072 $ (14 ) $ 24,988 $ (943 ) $ 74,060 Municipal bonds due (24 ) 1,374 — — (24 ) 1,374 U.S. government and agency securities (141 ) 37,565 (1,645 ) 76,499 (1,786 ) 114,064 Equity securities (12 ) 488 — — (12 ) 488 Mortgage-backed securities (28,748 ) 1,035,754 (61,669 ) 1,183,017 (90,417 ) 2,218,771 $ (29,854 ) $ 1,124,253 $ (63,328 ) $ 1,284,504 $ (93,182 ) $ 2,408,757

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Tables)	6 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Fair Value, Notional Amount and Balance Sheet Classification	The following tables present the fair value, notional amount and balance sheet classification of derivative assets and liabilities at March 31, 2019 and September 30, 2018 : March 31, 2019 Derivatives Assets Derivative Liabilities Balance Sheet Location Notional Fair Value Balance Sheet Location Notional Fair Value (In thousands) (In thousands) Client swap program Other assets $ 398,666 $ 2,822 Other liabilities $ 398,666 $ 2,822 Commercial loan fair value hedges Other assets — — Other liabilities 95,645 94 Borrowings cash flow hedges Other assets 700,000 5,600 Other liabilities — — $ 1,098,666 $ 8,422 $ 494,311 $ 2,916 September 30, 2018 Derivatives Assets Derivative Liabilities Interest rate contract purpose Balance Sheet Location Notional Fair Value Balance Sheet Location Notional Fair Value (In thousands) (In thousands) Client swap program Other assets $ 395,396 $ 12,731 Other liabilities $ 395,396 $ 12,731 Commercial loan fair value hedges Other assets 97,927 3,857 Other liabilities — — Borrowings cash flow hedges Other assets 700,000 22,250 Other liabilities — — $ 1,193,323 $ 38,838 $ 395,396 $ 12,731
Schedule of Fair Value Hedge Accounting on Carrying Value of Hedged Items	The following table presents the impact of fair value hedge accounting on the carrying value of the hedged items (fixed rate commercial loans) at March 31, 2019 : (In thousands) March 31, 2019 Balance sheet line item in which hedged item is recorded Carrying value of hedged items Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items Loans receivable $ 95,770 $ (94 ) $ 95,770 $ (94 )
Schedule of Impact of Derivative Instruments	The following table presents the impact of derivative instruments (cash flow hedges on borrowings) on AOCI for the periods presented: (In thousands) Three Months Ended March 31, Amount of gain/(loss) recognized in AOCI on derivatives in cash flow hedging relationships 2019 Interest rate contracts: Pay fixed/receive floating swaps on cash flow hedges of borrowings $ (6,150 ) Total pre-tax gain/(loss) recognized in AOCI $ (6,150 ) (In thousands) Six Months Ended March 31, Amount of gain/(loss) recognized in AOCI on derivatives in cash flow hedging relationships 2019 Interest rate contracts: Pay fixed/receive floating swaps on cash flow hedges of borrowings $ (16,650 ) Total pre-tax gain/(loss) recognized in AOCI $ (16,650 ) The following table presents the impact of derivative instruments (client swap program) that are not designated in accounting hedges under ASC 815 for the periods presented: (In thousands) Three Months Ended March 31, Derivative instruments Classification of gain/(loss) recognized in income on derivative instrument 2019 Interest rate contracts: Pay fixed/receive floating swap Other noninterest income $ (6,163 ) Receive fixed/pay floating swap Other noninterest income 6,163 $ — (In thousands) Six Months Ended March 31, Derivative instruments Classification of gain/(loss) recognized in income on derivative instrument 2019 Interest rate contracts: Pay fixed/receive floating swap Other noninterest income $ (15,553 ) Receive fixed/pay floating swap Other noninterest income 15,553 $ —
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location	The following table presents the gains/(losses) on derivative instruments in fair value and cash flow accounting hedging relationships under ASC 815 for the period presented: Three Months Ended March 31, 2019 Interest income on loans receivable Interest expense on FHLB advances (In thousands) Interest income/expense, including the effects of fair value and cash flow hedges $ 141,061 $ 17,846 Gain/(loss) on fair value hedging relationships: Interest rate contracts Amounts related to interest settlements on derivatives $ 58 Recognized on derivatives (1,600 ) Recognized on hedged items 1,602 Net income/(expense) recognized on fair value hedges $ 60 Gain/(loss) on cash flow hedging relationships: Interest rate contracts Amounts related to interest settlements on derivatives $ (854 ) Amount of derivative gain/(loss) reclassified from AOCI into interest income/expense — Net income/(expense) recognized on cash flow hedges $ (854 ) Six Months Ended March 31, 2019 Interest income on loans receivable Interest expense on FHLB advances (In thousands) Interest income/expense, including the effects of fair value and cash flow hedges $ 278,126 $ 34,737 Gain/(loss) on fair value hedging relationships: Interest rate contracts Amounts related to interest settlements on derivatives $ 77 Recognized on derivatives (3,917 ) Recognized on hedged items 3,881 Net income/(expense) recognized on fair value hedges $ 41 Gain/(loss) on cash flow hedging relationships: Interest rate contracts Amounts related to interest settlements on derivatives $ (1,404 ) Amount of derivative gain/(loss) reclassified from AOCI into interest income/expense — Net income/(expense) recognized on cash flow hedges $ (1,404 )

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cash collateral	$ 18,000	$ 18,000
Loans in process	1,162,787	1,195,506
Loans and Leases Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans in process	$ 2,265,227	$ 2,180,162

Dividends and Share Repurchas_2

Dividends and Share Repurchases (Details) - $ / shares	Apr. 29, 2019	Feb. 22, 2019	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Dividends Payable [Line Items]
Cash dividends per share (in dollars per share)		$ 0.2	$ 0.2	$ 0.17	$ 0.38	$ 0.32
Stock repurchased (in shares)			698,705
Average cost per share (in dollars per share)			$ 29.65
Remaining shares authorized to be repurchased (in shares)			9,593,701		9,593,701
Subsequent Event
Dividends Payable [Line Items]
Dividends declared (in dollars per share)	$ 0.2

Loans Receivable - Schedule of

Loans Receivable - Schedule of Accounts, Notes, Loans, and Financing Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 13,240,402		$ 12,853,678
Ratio of type of loan to total loans receivable	100.00%		100.00%
Allowance for loan losses	$ 133,086	$ 131,165	$ 129,257	$ 127,576	$ 127,155	$ 123,073
Loans in process	1,162,787		1,195,506
Net deferred fees, costs and discounts	49,693		51,834
Total loan contra accounts	1,345,566		1,376,597
Net loans	11,894,836		11,477,081
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 5,861,404		$ 5,798,966
Ratio of type of loan to total loans receivable	44.30%		45.10%
Allowance for loan losses	$ 31,476	31,484	$ 33,033	34,144	35,928	36,892
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 1,980,274		$ 1,890,668
Ratio of type of loan to total loans receivable	15.00%		14.70%
Allowance for loan losses	$ 33,396	31,463	$ 31,317	27,389	25,214	24,556
Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 586,515		$ 624,479
Ratio of type of loan to total loans receivable	4.40%		4.90%
Allowance for loan losses	$ 1,976	1,926	$ 1,842	2,081	2,052	1,944
Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 194,739		$ 155,204
Ratio of type of loan to total loans receivable	1.50%		1.20%
Allowance for loan losses	$ 9,734	9,156	$ 7,978	7,622	7,355	6,829
Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 97,152		$ 102,036
Ratio of type of loan to total loans receivable	0.70%		0.80%
Allowance for loan losses	$ 2,076	2,144	$ 2,164	2,853	2,906	2,649
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 1,423,723		$ 1,385,125
Ratio of type of loan to total loans receivable	10.70%		10.80%
Allowance for loan losses	$ 7,394	7,884	$ 8,329	7,982	7,904	7,862
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 1,570,502		$ 1,452,168
Ratio of type of loan to total loans receivable	11.90%		11.30%
Allowance for loan losses	$ 12,448	12,711	$ 11,852	11,588	11,625	11,818
Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 1,230,888		$ 1,140,874
Ratio of type of loan to total loans receivable	9.30%		8.90%
Allowance for loan losses	$ 30,574	30,279	$ 28,702	29,330	29,268	28,524
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 139,203		$ 130,852
Ratio of type of loan to total loans receivable	1.00%		1.00%
Allowance for loan losses	$ 1,082	1,064	$ 781	802	808	855
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 156,002		$ 173,306
Ratio of type of loan to total loans receivable	1.20%		1.30%
Allowance for loan losses	$ 2,930	$ 3,054	$ 3,259	$ 3,785	$ 4,095	$ 1,144

Loans Receivable - Loans on No

Loans Receivable - Loans on Non-accrual Status (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual percent of total loans	0.41%	0.49%
Non-accrual loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 48,941	$ 55,686
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status	100.00%	100.00%
Non-accrual loans | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 24,474	$ 27,643
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status	50.00%	49.60%
Non-accrual loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 1,282	$ 2,427
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status	2.60%	4.40%
Non-accrual loans | Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 242	$ 920
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status	0.50%	1.70%
Non-accrual loans | Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 579	$ 787
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status	1.20%	1.40%
Non-accrual loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 9,162	$ 8,971
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status	18.70%	16.10%
Non-accrual loans | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 12,366	$ 14,394
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status	25.30%	25.80%
Non-accrual loans | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 812	$ 523
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status	1.70%	0.90%
Non-accrual loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 24	$ 21
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status	0.00%	0.00%

Loans Receivable - Additional

Loans Receivable - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual interest income recognized			$ 1,571
Impaired, interest lost on nonaccrual loans			$ 1,151
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.40%		0.40%		0.42%
Percent of TDRs classified as performing			96.90%
Troubled debt restructuring, amount	$ 79	$ 2,183	$ 363	$ 11,451
Basis point reduction, minimum			1.00%
Basis point reduction, maximum			2.00%
Single family residential loans as percentage of restructured loans	89.80%		89.80%
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term for payment and rate reduction			6 months
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term for payment and rate reduction			24 months
Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructuring, amount			$ 140,599

Loans Receivable - Loans Recei

Loans Receivable - Loans Receivable, Analysis of Age of Loans in Past Due Status (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net of Loans In Process	$ 12,077,615	$ 11,658,172
Current	12,029,102	11,608,959
Total Delinquent	$ 48,513	$ 49,213
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.40%	0.42%
Ratio of total past due loans to total loans receivable, current	99.60%	99.58%
Ratio of total past due loans to total loans receivable, past due	0.40%	0.42%
30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	$ 13,636	$ 9,182
Ratio of total past due loans to total loans receivable, past due	0.11%	0.08%
60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	$ 3,393	$ 6,513
Ratio of total past due loans to total loans receivable, past due	0.03%	0.06%
90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	$ 31,484	$ 33,518
Ratio of total past due loans to total loans receivable, past due	0.26%	0.29%
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net of Loans In Process	$ 5,860,365	$ 5,798,353
Current	5,830,848	5,768,253
Total Delinquent	$ 29,517	$ 30,100
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.50%	0.52%
Single-family residential | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	$ 10,018	$ 7,983
Single-family residential | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	2,672	3,562
Single-family residential | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	16,827	18,555
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net of Loans In Process	1,139,970	1,062,855
Current	1,138,688	1,060,428
Total Delinquent	$ 1,282	$ 2,427
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.11%	0.23%
Construction | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	$ 0	$ 0
Construction | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	0	0
Construction | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	1,282	2,427
Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net of Loans In Process	307,405	289,192
Current	306,929	289,192
Total Delinquent	$ 476	$ 0
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.15%	0.00%
Construction - custom | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	$ 0	$ 0
Construction - custom | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	476	0
Construction - custom | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	0	0
Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net of Loans In Process	152,546	123,560
Current	152,394	122,620
Total Delinquent	$ 152	$ 940
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.10%	0.76%
Land - acquisition & development | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	$ 152	$ 0
Land - acquisition & development | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	0	270
Land - acquisition & development | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	0	670
Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net of Loans In Process	97,033	101,908
Current	96,278	101,294
Total Delinquent	$ 755	$ 614
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.78%	0.60%
Land - consumer lot loans | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	$ 502	$ 144
Land - consumer lot loans | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	0	117
Land - consumer lot loans | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	253	353
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net of Loans In Process	1,423,701	1,385,103
Current	1,422,270	1,385,103
Total Delinquent	$ 1,431	$ 0
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.10%	0.00%
Multi-family | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	$ 1,431	$ 0
Multi-family | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	0	0
Multi-family | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	0	0
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net of Loans In Process	1,570,502	1,452,169
Current	1,566,393	1,448,946
Total Delinquent	$ 4,109	$ 3,223
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.26%	0.22%
Commercial real estate | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	$ 743	$ 316
Commercial real estate | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	0	1,767
Commercial real estate | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	3,366	1,140
Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net of Loans In Process	1,230,888	1,140,874
Current	1,221,571	1,130,836
Total Delinquent	$ 9,317	$ 10,038
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.76%	0.88%
Commercial & industrial | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	$ 311	$ 0
Commercial & industrial | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	0	0
Commercial & industrial | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	9,006	10,038
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net of Loans In Process	139,203	130,852
Current	137,982	129,510
Total Delinquent	$ 1,221	$ 1,342
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.88%	1.03%
HELOC | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	$ 388	$ 567
HELOC | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	229	469
HELOC | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	604	306
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net of Loans In Process	156,002	173,306
Current	155,749	172,777
Total Delinquent	$ 253	$ 529
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.16%	0.31%
Consumer | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	$ 91	$ 172
Consumer | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	16	328
Consumer | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Delinquent	$ 146	$ 29

Loans Receivable - Troubled De

Loans Receivable - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019USD ($)contract	Mar. 31, 2018USD ($)contract	Mar. 31, 2019USD ($)contract	Mar. 31, 2018USD ($)contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	3	12	4	23
Pre-Modification Outstanding Recorded Investment	$ 79	$ 2,183	$ 363	$ 11,451
Post-Modification Outstanding Recorded Investment	$ 79	$ 2,183	$ 363	$ 11,451
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	2	12	3	20
Pre-Modification Outstanding Recorded Investment	$ 39	$ 2,183	$ 323	$ 4,195
Post-Modification Outstanding Recorded Investment	$ 39	$ 2,183	$ 323	$ 4,195
Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	1	0	1	0
Pre-Modification Outstanding Recorded Investment	$ 40	$ 0	$ 40	$ 0
Post-Modification Outstanding Recorded Investment	$ 40	$ 0	$ 40	$ 0
Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract			0	3
Pre-Modification Outstanding Recorded Investment			$ 0	$ 7,256
Post-Modification Outstanding Recorded Investment			$ 0	$ 7,256

Loans Receivable - Loan Modifi

Loans Receivable - Loan Modifications (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019USD ($)contract	Mar. 31, 2018USD ($)contract	Mar. 31, 2019USD ($)contract	Mar. 31, 2018USD ($)contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	4	1	5	2
Recorded Investment | $	$ 755	$ 162	$ 1,298	$ 206
Single-family residential
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	4	1	5	2
Recorded Investment | $	$ 755	$ 162	$ 1,298	$ 206

Allowance for Losses on Loans

Allowance for Losses on Loans - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	$ 131,165	$ 127,155	$ 129,257	$ 123,073
Charge-offs	(1,015)	(439)	(2,656)	(1,191)
Recoveries	2,186	1,810	5,235	5,644
Provision & Transfers	750	(950)	1,250	50
Ending Allowance	133,086	127,576	133,086	127,576
Single-family residential
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	31,484	35,928	33,033	36,892
Charge-offs	(150)	(290)	(175)	(750)
Recoveries	310	211	539	331
Provision & Transfers	(168)	(1,705)	(1,921)	(2,329)
Ending Allowance	31,476	34,144	31,476	34,144
Construction
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	31,463	25,214	31,317	24,556
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision & Transfers	1,933	2,175	2,079	2,833
Ending Allowance	33,396	27,389	33,396	27,389
Construction - custom
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	1,926	2,052	1,842	1,944
Charge-offs	0	0	0	(50)
Recoveries	0	0	0	0
Provision & Transfers	50	29	134	187
Ending Allowance	1,976	2,081	1,976	2,081
Land - acquisition & development
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	9,156	7,355	7,978	6,829
Charge-offs	0	0	0	0
Recoveries	1,300	1,207	3,082	4,579
Provision & Transfers	(722)	(940)	(1,326)	(3,786)
Ending Allowance	9,734	7,622	9,734	7,622
Land - consumer lot loans
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	2,144	2,906	2,164	2,649
Charge-offs	(48)	(18)	(120)	(66)
Recoveries	0	0	265	0
Provision & Transfers	(20)	(35)	(233)	270
Ending Allowance	2,076	2,853	2,076	2,853
Multi-family
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	7,884	7,904	8,329	7,862
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision & Transfers	(490)	78	(935)	120
Ending Allowance	7,394	7,982	7,394	7,982
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	12,711	11,625	11,852	11,818
Charge-offs	0	(36)	(339)	(36)
Recoveries	244	1	770	1
Provision & Transfers	(507)	(2)	165	(195)
Ending Allowance	12,448	11,588	12,448	11,588
Commercial & industrial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	30,279	29,268	28,702	28,524
Charge-offs	(285)	0	(464)	(116)
Recoveries	24	115	58	170
Provision & Transfers	556	(53)	2,278	752
Ending Allowance	30,574	29,330	30,574	29,330
HELOC
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	1,064	808	781	855
Charge-offs	(200)	(1)	(1,086)	(1)
Recoveries	43	0	44	1
Provision & Transfers	175	(5)	1,343	(53)
Ending Allowance	1,082	802	1,082	802
Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	3,054	4,095	3,259	1,144
Charge-offs	(332)	(94)	(472)	(172)
Recoveries	265	276	477	562
Provision & Transfers	(57)	(492)	(334)	2,251
Ending Allowance	$ 2,930	$ 3,785	$ 2,930	$ 3,785

Allowance for Losses on Loans_2

Allowance for Losses on Loans - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision (release) for loan losses	$ 750	$ (950)	$ 250	$ (950)
Charge-offs, net of (recoveries)	1,171	1,371	2,579	4,453
Loans receivable, gross	$ 13,240,402		$ 13,240,402			$ 12,853,678
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.40%		0.40%			0.42%
Allowance for loan losses	$ 133,086	$ 127,576	$ 133,086	$ 127,576	$ 131,165	$ 129,257	$ 127,155	$ 123,073
Allowance for credit losses and reserve for unfunded commitments	$ 139,336		$ 139,336
Allowance for credit losses and reserve for unfunded commitments, percent of gross loans	1.05%		1.05%
Non-accrual loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 48,941		$ 48,941			55,686
Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	12,027,366		12,027,366			11,597,492
Allowance for loan losses	132,710		132,710			128,740
Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	50,249		50,249			60,680
Allowance for loan losses	376		376			517
Unfunded Loan Commitment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	6,250		6,250			7,250
Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 59,572		$ 59,572			$ 70,093
Ratio of non-performing assets to total assets	0.36%		0.36%			0.44%
Non-accrual loans	$ 48,941		$ 48,941			$ 55,686

Allowance for Losses on Loans_3

Allowance for Losses on Loans - Loans Evaluated for Impairment (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 133,086	$ 131,165	$ 129,257	$ 127,576	$ 127,155	$ 123,073
Recorded Investment of Loans	13,240,402		12,853,678
Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	132,710		128,740
Recorded Investment of Loans	$ 12,027,366		$ 11,597,492
Ratio	1.10%		1.10%
Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 376		$ 517
Recorded Investment of Loans	$ 50,249		$ 60,680
Ratio	0.70%		0.90%
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 31,476	31,484	$ 33,033	34,144	35,928	36,892
Recorded Investment of Loans	5,861,404		5,798,966
Single-family residential | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	31,476		33,033
Recorded Investment of Loans	$ 5,848,663		$ 5,782,870
Ratio	0.50%		0.60%
Single-family residential | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 0		$ 0
Recorded Investment of Loans	$ 16,836		$ 21,345
Ratio	0.00%		0.00%
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 33,396	31,463	$ 31,317	27,389	25,214	24,556
Recorded Investment of Loans	1,980,274		1,890,668
Construction | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	33,396		31,317
Recorded Investment of Loans	$ 1,138,688		$ 1,060,428
Ratio	2.90%		3.00%
Construction | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 0		$ 0
Recorded Investment of Loans	$ 1,282		$ 2,427
Ratio	0.00%		0.00%
Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 1,976	1,926	$ 1,842	2,081	2,052	1,944
Recorded Investment of Loans	586,515		624,479
Construction - custom | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	1,976		1,842
Recorded Investment of Loans	$ 307,405		$ 289,192
Ratio	0.60%		0.60%
Construction - custom | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 0		$ 0
Recorded Investment of Loans	$ 0		$ 0
Ratio	0.00%		0.00%
Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 9,734	9,156	$ 7,978	7,622	7,355	6,829
Recorded Investment of Loans	194,739		155,204
Land - acquisition & development | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	9,727		7,969
Recorded Investment of Loans	$ 152,304		$ 122,639
Ratio	6.40%		6.50%
Land - acquisition & development | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 7		$ 9
Recorded Investment of Loans	$ 242		$ 920
Ratio	2.90%		1.00%
Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 2,076	2,144	$ 2,164	2,853	2,906	2,649
Recorded Investment of Loans	97,152		102,036
Land - consumer lot loans | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	2,076		2,164
Recorded Investment of Loans	$ 92,614		$ 96,583
Ratio	2.20%		2.20%
Land - consumer lot loans | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 0		$ 0
Recorded Investment of Loans	$ 309		$ 507
Ratio	0.00%		0.00%
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 7,394	7,884	$ 8,329	7,982	7,904	7,862
Recorded Investment of Loans	1,423,723		1,385,125
Multi-family | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	7,390		8,325
Recorded Investment of Loans	$ 1,422,864		$ 1,384,655
Ratio	0.50%		0.60%
Multi-family | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 4		$ 4
Recorded Investment of Loans	$ 837		$ 448
Ratio	0.50%		1.00%
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 12,448	12,711	$ 11,852	11,588	11,625	11,818
Recorded Investment of Loans	1,570,502		1,452,168
Commercial real estate | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	12,328		11,702
Recorded Investment of Loans	$ 1,552,990		$ 1,432,791
Ratio	0.80%		0.80%
Commercial real estate | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 120		$ 150
Recorded Investment of Loans	$ 17,512		$ 19,378
Ratio	0.70%		0.80%
Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 30,574	30,279	$ 28,702	29,330	29,268	28,524
Recorded Investment of Loans	1,230,888		1,140,874
Commercial & industrial | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	30,329		28,348
Recorded Investment of Loans	$ 1,219,921		$ 1,126,438
Ratio	2.50%		2.50%
Commercial & industrial | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 245		$ 354
Recorded Investment of Loans	$ 12,651		$ 14,437
Ratio	1.90%		2.50%
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 1,082	1,064	$ 781	802	808	855
Recorded Investment of Loans	139,203		130,852
HELOC | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	1,082		781
Recorded Investment of Loans	$ 137,716		$ 128,715
Ratio	0.80%		0.60%
HELOC | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 0		$ 0
Recorded Investment of Loans	$ 528		$ 1,162
Ratio	0.00%		0.00%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 2,930	$ 3,054	$ 3,259	$ 3,785	$ 4,095	$ 1,144
Recorded Investment of Loans	156,002		173,306
Consumer | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	2,930		3,259
Recorded Investment of Loans	$ 154,201		$ 173,181
Ratio	1.90%		1.90%
Consumer | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 0		$ 0
Recorded Investment of Loans	$ 52		$ 56
Ratio	0.00%		0.00%

Allowance for Losses on Loans_4

Allowance for Losses on Loans - Internally Assigned Grade (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 13,240,402	$ 12,853,678
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 13,120,199	$ 12,728,537
Total grade as a % of total gross loans	99.10%	99.00%
Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 14,261	$ 27,197
Total grade as a % of total gross loans	0.10%	0.20%
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 105,942	$ 97,944
Total grade as a % of total gross loans	0.80%	0.80%
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 0	$ 0
Total grade as a % of total gross loans	0.00%	0.00%
Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 0	$ 0
Total grade as a % of total gross loans	0.00%	0.00%
Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 5,861,404	$ 5,798,966
Single-family residential | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,831,775	5,766,096
Single-family residential | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Single-family residential | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	29,629	32,870
Single-family residential | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Single-family residential | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Construction
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,980,274	1,890,668
Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,978,992	1,886,304
Construction | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	1,937
Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,282	2,427
Construction | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Construction | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	586,515	624,479
Construction - custom | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	586,515	624,479
Construction - custom | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Construction - custom | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Construction - custom | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Construction - custom | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	194,739	155,204
Land - acquisition & development | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	190,807	152,984
Land - acquisition & development | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	2,424	0
Land - acquisition & development | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,508	2,220
Land - acquisition & development | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Land - acquisition & development | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	97,152	102,036
Land - consumer lot loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	96,573	101,249
Land - consumer lot loans | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Land - consumer lot loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	579	787
Land - consumer lot loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Land - consumer lot loans | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,423,723	1,385,125
Multi-family | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,415,872	1,378,803
Multi-family | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	1,633
Multi-family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	7,851	4,689
Multi-family | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Multi-family | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,570,502	1,452,168
Commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,529,461	1,421,602
Commercial real estate | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	7,599	7,114
Commercial real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	33,442	23,452
Commercial real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Commercial real estate | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,230,888	1,140,874
Commercial & industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,195,835	1,093,405
Commercial & industrial | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	4,238	16,513
Commercial & industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	30,815	30,956
Commercial & industrial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Commercial & industrial | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
HELOC
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	139,203	130,852
HELOC | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	138,391	130,330
HELOC | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
HELOC | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	812	522
HELOC | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
HELOC | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	156,002	173,306
Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	155,978	173,285
Consumer | Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	24	21
Consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Consumer | Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 0	$ 0

Allowance for Losses on Loans_5

Allowance for Losses on Loans - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 13,240,402	$ 12,853,678
Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 13,191,461	$ 12,797,992
Performing Loans, % of Total Gross Loans	99.60%	99.60%
Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 59,572	$ 70,093
Non-Performing Loans, Amount	$ 48,941	$ 55,686
Non-Performing Loans, % of Total Gross Loans	0.40%	0.40%
Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 5,861,404	$ 5,798,966
Single-family residential | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 5,836,930	$ 5,771,323
Performing Loans, % of Total Gross Loans	99.60%	99.50%
Single-family residential | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 24,474	$ 27,643
Non-Performing Loans, % of Total Gross Loans	0.40%	0.50%
Construction
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 1,980,274	$ 1,890,668
Construction | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 1,978,992	$ 1,888,241
Performing Loans, % of Total Gross Loans	99.90%	99.90%
Construction | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 1,282	$ 2,427
Non-Performing Loans, % of Total Gross Loans	0.10%	0.10%
Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 586,515	$ 624,479
Construction - custom | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 586,515	$ 624,479
Performing Loans, % of Total Gross Loans	100.00%	100.00%
Construction - custom | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 0	$ 0
Non-Performing Loans, % of Total Gross Loans	0.00%	0.00%
Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 194,739	$ 155,204
Land - acquisition & development | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 194,497	$ 154,284
Performing Loans, % of Total Gross Loans	99.90%	99.40%
Land - acquisition & development | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 242	$ 920
Non-Performing Loans, % of Total Gross Loans	0.10%	0.60%
Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 97,152	$ 102,036
Land - consumer lot loans | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 96,573	$ 101,249
Performing Loans, % of Total Gross Loans	99.40%	99.20%
Land - consumer lot loans | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 579	$ 787
Non-Performing Loans, % of Total Gross Loans	0.60%	0.80%
Multi-family
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 1,423,723	$ 1,385,125
Multi-family | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 1,423,723	$ 1,385,125
Performing Loans, % of Total Gross Loans	100.00%	100.00%
Multi-family | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 0	$ 0
Non-Performing Loans, % of Total Gross Loans	0.00%	0.00%
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 1,570,502	$ 1,452,168
Commercial real estate | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 1,561,340	$ 1,443,197
Performing Loans, % of Total Gross Loans	99.40%	99.40%
Commercial real estate | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 9,162	$ 8,971
Non-Performing Loans, % of Total Gross Loans	0.60%	0.60%
Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 1,230,888	$ 1,140,874
Commercial & industrial | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 1,218,522	$ 1,126,480
Performing Loans, % of Total Gross Loans	99.00%	98.70%
Commercial & industrial | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 12,366	$ 14,394
Non-Performing Loans, % of Total Gross Loans	1.00%	1.30%
HELOC
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 139,203	$ 130,852
HELOC | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 138,391	$ 130,329
Performing Loans, % of Total Gross Loans	99.40%	99.60%
HELOC | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 812	$ 523
Non-Performing Loans, % of Total Gross Loans	0.60%	0.40%
Consumer
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 156,002	$ 173,306
Consumer | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Performing Loans, Amount	$ 155,978	$ 173,285
Performing Loans, % of Total Gross Loans	100.00%	100.00%
Consumer | Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Performing Loans, Amount	$ 24	$ 21
Non-Performing Loans, % of Total Gross Loans	0.00%	0.00%

Allowance for Losses on Loans_6

Allowance for Losses on Loans - Impaired Loans Based on Loan Types (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2019	Sep. 30, 2018
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 176,811	$ 199,545
Unpaid Principal Balance	190,921	214,712
Related Allowance	2,578	3,388
Average Recorded Investment (Year-To-Date)	187,998	228,398
Amount of related allowance included in specific reserves	376	517
Amount of related allowance included in general reserves	2,202	2,871
Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	36,212	42,687
Unpaid Principal Balance	42,441	49,425
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	38,947	43,292
Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	140,599	156,858
Unpaid Principal Balance	148,480	165,287
Related Allowance	2,578	3,388
Average Recorded Investment (Year-To-Date)	149,051	185,106
Single-family residential
Financing Receivable, Impaired [Line Items]
Recorded Investment	142,354	158,668
Unpaid Principal Balance	146,007	163,149
Related Allowance	2,202	2,871
Average Recorded Investment (Year-To-Date)	150,090	181,826
Single-family residential | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	16,089	18,872
Unpaid Principal Balance	16,964	20,050
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	16,800	20,097
Single-family residential | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	126,265	139,796
Unpaid Principal Balance	129,043	143,099
Related Allowance	2,202	2,871
Average Recorded Investment (Year-To-Date)	133,290	161,729
Construction
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,532	2,698
Unpaid Principal Balance	1,750	2,818
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	1,953	1,349
Construction | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,532	2,698
Unpaid Principal Balance	1,750	2,818
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	1,953	1,349
Construction - custom
Financing Receivable, Impaired [Line Items]
Recorded Investment		0
Unpaid Principal Balance		0
Related Allowance		0
Average Recorded Investment (Year-To-Date)		74
Construction - custom | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment		0
Unpaid Principal Balance		0
Related Allowance		0
Average Recorded Investment (Year-To-Date)		74
Land - acquisition & development
Financing Receivable, Impaired [Line Items]
Recorded Investment	242	921
Unpaid Principal Balance	297	971
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	534	611
Land - acquisition & development | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	143	814
Unpaid Principal Balance	143	814
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	431	572
Land - acquisition & development | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	99	107
Unpaid Principal Balance	154	157
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	103	39
Land - consumer lot loans
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,624	5,227
Unpaid Principal Balance	5,111	5,626
Related Allowance	7	9
Average Recorded Investment (Year-To-Date)	4,878	6,709
Land - consumer lot loans | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	135	311
Unpaid Principal Balance	165	336
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	209	260
Land - consumer lot loans | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,489	4,916
Unpaid Principal Balance	4,946	5,290
Related Allowance	7	9
Average Recorded Investment (Year-To-Date)	4,669	6,449
Multi-family
Financing Receivable, Impaired [Line Items]
Recorded Investment	419	448
Unpaid Principal Balance	419	448
Related Allowance	4	4
Average Recorded Investment (Year-To-Date)	434	541
Multi-family | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment		0
Unpaid Principal Balance		0
Related Allowance		0
Average Recorded Investment (Year-To-Date)		70
Multi-family | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	419	448
Unpaid Principal Balance	419	448
Related Allowance	4	4
Average Recorded Investment (Year-To-Date)	434	471
Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment	13,699	15,679
Unpaid Principal Balance	19,533	21,768
Related Allowance	120	150
Average Recorded Investment (Year-To-Date)	14,959	21,603
Commercial real estate | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	8,757	9,425
Unpaid Principal Balance	13,482	14,035
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	9,376	11,158
Commercial real estate | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,942	6,254
Unpaid Principal Balance	6,051	7,733
Related Allowance	120	150
Average Recorded Investment (Year-To-Date)	5,583	10,445
Commercial & industrial
Financing Receivable, Impaired [Line Items]
Recorded Investment	12,366	14,428
Unpaid Principal Balance	16,151	17,652
Related Allowance	245	354
Average Recorded Investment (Year-To-Date)	13,607	13,703
Commercial & industrial | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	9,006	10,137
Unpaid Principal Balance	9,321	10,146
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	9,670	9,208
Commercial & industrial | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,360	4,291
Unpaid Principal Balance	6,830	7,506
Related Allowance	245	354
Average Recorded Investment (Year-To-Date)	3,937	4,495
HELOC
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,488	1,386
Unpaid Principal Balance	1,500	2,154
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	1,454	1,845
HELOC | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	528	410
Unpaid Principal Balance	528	1,170
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	486	450
HELOC | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	960	976
Unpaid Principal Balance	972	984
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	968	1,395
Consumer
Financing Receivable, Impaired [Line Items]
Recorded Investment	87	90
Unpaid Principal Balance	153	126
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	89	137
Consumer | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	22	20
Unpaid Principal Balance	88	56
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	22	54
Consumer | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	65	70
Unpaid Principal Balance	65	70
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	$ 67	$ 83

Fair Value Measurements - Recu

Fair Value Measurements - Recurring and Nonrecurring (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 1,545,606		$ 1,545,606
Available-for-sale securities					$ 1,314,957
Total financial assets	3,081,158		3,081,158		2,863,727
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,545,606		1,545,606
Available-for-sale securities					1,314,957
Total financial assets	1,554,028		1,554,028		1,353,795
Total financial liabilities	2,916		2,916		12,731
Recurring | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	2,822		2,822		12,731
Derivative liabilities	2,822		2,822		12,731
Recurring | Commercial loan hedges
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets					3,857
Derivative liabilities	94		94
Recurring | Borrowings cash flow hedges
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	5,600		5,600		22,250
Recurring | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities					488
Recurring | U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	235,280		235,280		207,293
Recurring | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	22,408		22,408		22,978
Recurring | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	257,981		257,981		184,695
Recurring | Agency pass-through certificates
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,029,937		1,029,937		896,041
Recurring | Commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities					3,462
Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0
Available-for-sale securities					488
Total financial assets	0		0		488
Total financial liabilities	0		0		0
Recurring | Level 1 | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0		0
Derivative liabilities	0		0		0
Recurring | Level 1 | Commercial loan hedges
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets					0
Derivative liabilities	0		0
Recurring | Level 1 | Borrowings cash flow hedges
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0		0
Recurring | Level 1 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities					488
Recurring | Level 1 | U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0		0
Recurring | Level 1 | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0		0
Recurring | Level 1 | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0		0
Recurring | Level 1 | Agency pass-through certificates
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0		0
Recurring | Level 1 | Commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities					0
Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,545,606		1,545,606
Available-for-sale securities					1,314,469
Total financial assets	1,554,028		1,554,028		1,353,307
Total financial liabilities	2,916		2,916		12,731
Recurring | Level 2 | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	2,822		2,822		12,731
Derivative liabilities	2,822		2,822		12,731
Recurring | Level 2 | Commercial loan hedges
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets					3,857
Derivative liabilities	94		94
Recurring | Level 2 | Borrowings cash flow hedges
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	5,600		5,600		22,250
Recurring | Level 2 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities					0
Recurring | Level 2 | U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	235,280		235,280		207,293
Recurring | Level 2 | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	22,408		22,408		22,978
Recurring | Level 2 | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	257,981		257,981		184,695
Recurring | Level 2 | Agency pass-through certificates
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,029,937		1,029,937		896,041
Recurring | Level 2 | Commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities					3,462
Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0
Available-for-sale securities					0
Total financial assets	0		0		0
Total financial liabilities	0		0		0
Recurring | Level 3 | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0		0
Derivative liabilities	0		0		0
Recurring | Level 3 | Commercial loan hedges
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets					0
Derivative liabilities	0		0
Recurring | Level 3 | Borrowings cash flow hedges
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0		0
Recurring | Level 3 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities					0
Recurring | Level 3 | U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0		0
Recurring | Level 3 | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0		0
Recurring | Level 3 | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0		0
Recurring | Level 3 | Agency pass-through certificates
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0		0
Recurring | Level 3 | Commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities					$ 0
Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	5,866	$ 12,863	5,866	$ 12,863
Nonrecurring | Changes measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss related to impaired loans and real estate held for sale, measured on nonrecurring basis	(80)	(845)	(838)	(1,532)
Nonrecurring | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	3,316	7,343	3,316	7,343
Nonrecurring | Impaired loans | Changes measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss related to impaired loans and real estate held for sale, measured on nonrecurring basis	(511)	(466)	(1,237)	(973)
Nonrecurring | Real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	2,550	5,520	2,550	5,520
Nonrecurring | Real estate owned | Changes measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss related to impaired loans and real estate held for sale, measured on nonrecurring basis	431	(379)	399	(559)
Nonrecurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0	0	0	0
Nonrecurring | Level 1 | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0	0	0	0
Nonrecurring | Level 1 | Real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0	0	0	0
Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0	0	0	0
Nonrecurring | Level 2 | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0	0	0	0
Nonrecurring | Level 2 | Real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0	0	0	0
Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	5,866	12,863	5,866	12,863
Nonrecurring | Level 3 | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	3,316	7,343	3,316	7,343
Nonrecurring | Level 3 | Real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	$ 2,550	$ 5,520	$ 2,550	$ 5,520

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value by Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities		$ 1,314,957
Held-to-maturity securities	$ 1,535,552	1,548,770
FHLB and FRB stock	138,390	127,190
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	1,545,606	1,314,957
Held-to-maturity securities	1,553,683	1,625,420
Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	1,545,606	1,314,957
Held-to-maturity securities	1,535,552	1,548,770
Level 1 | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	279,554	268,650
Level 1 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	279,554	268,650
Level 2 | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
FHLB and FRB stock	138,390	127,190
Time deposit accounts	4,939,365	4,804,803
FHLB advances	2,610,000	2,330,000
Level 2 | Carrying Amount | Interest rate contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	2,822	12,731
Other liabilities - interest rate contracts	2,822	12,731
Level 2 | Carrying Amount | Commercial loan hedges
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	0	3,857
Other liabilities - interest rate contracts	94	0
Level 2 | Carrying Amount | Borrowings cash flow hedges
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	5,600	22,250
Level 2 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
FHLB and FRB stock	138,390	127,190
Time deposit accounts	4,942,666	4,779,040
FHLB advances	2,590,365	2,316,964
Level 2 | Estimated Fair Value | Interest rate contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	2,822	12,731
Other liabilities - interest rate contracts	2,822	12,731
Level 2 | Estimated Fair Value | Commercial loan hedges
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	0	3,857
Other liabilities - interest rate contracts	94	0
Level 2 | Estimated Fair Value | Borrowings cash flow hedges
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	5,600	22,250
Level 3 | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans receivable	11,894,836	11,477,081
Level 3 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans receivable	12,234,924	11,556,326
Equity securities | Level 1 | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities		488
Equity securities | Level 1 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities		488
U.S. government and agency securities | Level 2 | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	235,280	207,293
U.S. government and agency securities | Level 2 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	235,280	207,293
Municipal bonds | Level 2 | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	22,408	22,978
Municipal bonds | Level 2 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	22,408	22,978
Corporate debt securities | Level 2 | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	257,981	184,695
Corporate debt securities | Level 2 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	257,981	184,695
Agency pass-through certificates
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities	1,520,608	1,533,742
Agency pass-through certificates | Level 2 | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	1,029,937	896,041
Held-to-maturity securities	1,538,683	1,610,420
Agency pass-through certificates | Level 2 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	1,029,937	896,041
Held-to-maturity securities	1,520,608	1,533,742
Commercial MBS
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities	14,944	15,028
Commercial MBS | Level 2 | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	0	3,462
Held-to-maturity securities	15,000	15,000
Commercial MBS | Level 2 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	0	3,462
Held-to-maturity securities	$ 14,944	$ 15,028

Fair Value Measurements - Inve

Fair Value Measurements - Investments by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Amortized Cost, Available-for-sale securities
Amortized Cost	$ 1,540,028
Amortized Cost		$ 1,326,471
Gross Unrealized Gains / Losses, Available-for-sale securities
Gross unrealized gains	13,268
Gross unrealized gains		4,685
Gross unrealized loss	(7,690)
Gross unrealized loss		(16,199)
Fair Value, Available-for-sale securities
Available-for-sale securities, at fair value	$ 1,545,606
Available-for-sale securities, at fair value		$ 1,314,957
Yield, Available-for-sale securities
Yield	3.44%
Yield		3.30%
Amortized Cost, Held-to-maturity securities
Held-to-maturity securities, at amortized cost	$ 1,553,683	$ 1,625,420
Gross Unrealized Gains / Losses, Held-to-maturity securities
Held-to-maturity securities, Gross unrealized gains	3,599	333
Held-to-maturity securities ,Gross unrealized losses	(21,730)	(76,983)
Fair Value, Held-to-maturity securities
Held-to-maturity securities, Fair Value	$ 1,535,552	$ 1,548,770
Yield, Held-to-maturity securities
Held-to-maturity securities, Yield	3.16%	3.16%
Investments	$ 3,093,711	$ 2,951,891
Gross unrealized gains on investments	16,867	5,018
Gross unrealized losses on investments	(29,420)	(93,182)
Total financial assets	$ 3,081,158	$ 2,863,727
Yield on investments	3.30%	3.22%
U.S. government and agency securities
Amortized Cost, Available-for-sale securities
5 to 10 years	$ 70,806	$ 60,872
Over 10 years	166,674	148,099
Gross Unrealized Gains / Losses, Available-for-sale securities
Gross unrealized gains, 5 to 10 years	2	0
Gross unrealized gains, Over 10 years	38	109
Gross unrealized losses, 5 to 10 years	(1,182)	(1,473)
Gross unrealized losses, Over 10 years	(1,058)	(314)
Fair Value, Available-for-sale securities
5 to 10 years	69,626	59,399
Over 10 years	$ 165,654	$ 147,894
Yield, Available-for-sale securities
5 to 10 years	2.75%	2.55%
Over 10 years	3.55%	3.05%
Equity securities
Amortized Cost, Available-for-sale securities
1 to 5 years		$ 500
Gross Unrealized Gains / Losses, Available-for-sale securities
Gross unrealized gains, 1 to 5 years		0
Gross unrealized losses, 1 to 5 years		(12)
Fair Value, Available-for-sale securities
1 to 5 years		$ 488
Yield, Available-for-sale securities
1 to 5 years		1.80%
Corporate debt securities
Amortized Cost, Available-for-sale securities
1 to 5 years	$ 113,832	$ 113,762
5 to 10 years	142,776	69,965
Gross Unrealized Gains / Losses, Available-for-sale securities
Gross unrealized gains, 1 to 5 years	1,402	1,875
Gross unrealized gains, 5 to 10 years	808	35
Gross unrealized losses, 1 to 5 years	(263)	(13)
Gross unrealized losses, 5 to 10 years	(574)	(929)
Fair Value, Available-for-sale securities
1 to 5 years	114,971	115,624
5 to 10 years	$ 143,010	$ 69,071
Yield, Available-for-sale securities
1 to 5 years	3.92%	3.59%
5 to 10 years	3.49%	3.23%
Municipal bonds due
Amortized Cost, Available-for-sale securities
1 to 5 years	$ 1,414	$ 1,398
Over 10 years	20,313	20,323
Gross Unrealized Gains / Losses, Available-for-sale securities
Gross unrealized gains, 1 to 5 years	12	0
Gross unrealized gains, Over 10 years	669	1,281
Gross unrealized losses, 1 to 5 years	0	(24)
Gross unrealized losses, Over 10 years	0	0
Fair Value, Available-for-sale securities
1 to 5 years	1,426	1,374
Over 10 years	$ 20,982	$ 21,604
Yield, Available-for-sale securities
1 to 5 years	1.92%	2.05%
Over 10 years	6.45%	6.45%
Agency pass-through certificates
Amortized Cost, Available-for-sale securities
Without single maturity date	$ 1,024,213	$ 908,092
Gross Unrealized Gains / Losses, Available-for-sale securities
Gross unrealized gains, Without single maturity date	10,337	1,383
Gross unrealized losses, Without single maturity date	(4,613)	(13,434)
Fair Value, Available-for-sale securities
Without single maturity date	$ 1,029,937	$ 896,041
Yield, Available-for-sale securities
Without single maturity date	3.36%	3.29%
Amortized Cost, Held-to-maturity securities
Held-to-maturity securities, at amortized cost	$ 1,538,683	$ 1,610,420
Gross Unrealized Gains / Losses, Held-to-maturity securities
Held-to-maturity securities, Gross unrealized gains	3,599	305
Held-to-maturity securities ,Gross unrealized losses	(21,674)	(76,983)
Fair Value, Held-to-maturity securities
Held-to-maturity securities, Fair Value	$ 1,520,608	$ 1,533,742
Yield, Held-to-maturity securities
Held-to-maturity securities, Yield	3.16%	3.16%
Commercial MBS
Amortized Cost, Available-for-sale securities
Without single maturity date		$ 3,460
Gross Unrealized Gains / Losses, Available-for-sale securities
Gross unrealized gains, Without single maturity date		2
Gross unrealized losses, Without single maturity date		0
Fair Value, Available-for-sale securities
Without single maturity date		$ 3,462
Yield, Available-for-sale securities
Without single maturity date		4.36%
Amortized Cost, Held-to-maturity securities
Held-to-maturity securities, at amortized cost	$ 15,000	$ 15,000
Gross Unrealized Gains / Losses, Held-to-maturity securities
Held-to-maturity securities, Gross unrealized gains	0	28
Held-to-maturity securities ,Gross unrealized losses	(56)	0
Fair Value, Held-to-maturity securities
Held-to-maturity securities, Fair Value	$ 14,944	$ 15,028
Yield, Held-to-maturity securities
Held-to-maturity securities, Yield	3.35%	3.03%

Fair Value Measurements - Addi

Fair Value Measurements - Additional Information (Details) - USD ($)	3 Months Ended	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Proceeds from sales of available-for-sale securities	$ 0	$ 491,000
Available-for-sale securities purchased		290,574,000
Available-for-sale securities purchased			$ 123,324,000
Held-to-maturity securities purchased		0	170,836,000
Proceeds from sale of held-to-maturity securities		$ 0	$ 0
Term of contractual due dates of substantially all mortgage-backed securities (in years)		10 years

Fair Value Measurements - Secu

Fair Value Measurements - Securities in Unrealized Loss Positions (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Unrealized Gross Losses	$ (1,613)
Less than 12 months, Unrealized Gross Losses		$ (29,854)
Less than 12 months, Fair Value	294,394
Less than 12 months, Fair Value		1,124,253
12 months or more, Unrealized Gross Losses	(27,807)
12 months or more, Unrealized Gross Losses		(63,328)
12 months or more, Fair Value	1,800,801
12 months or more, Fair Value		1,284,504
Total Unrealized Gross Losses	(29,420)
Total Unrealized Gross Losses		(93,182)
Total, Fair Value	2,095,195
Total, Fair Value		2,408,757
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Unrealized Gross Losses	(574)	(929)
Less than 12 months, Fair Value	49,521	49,072
12 months or more, Unrealized Gross Losses	(263)	(14)
12 months or more, Fair Value	49,737	24,988
Total Unrealized Gross Losses	(837)	(943)
Total, Fair Value	99,258	74,060
Municipal bonds due
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Unrealized Gross Losses		(24)
Less than 12 months, Fair Value		1,374
12 months or more, Unrealized Gross Losses		0
12 months or more, Fair Value		0
Total Unrealized Gross Losses		(24)
Total, Fair Value		1,374
U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Unrealized Gross Losses	(621)	(141)
Less than 12 months, Fair Value	84,101	37,565
12 months or more, Unrealized Gross Losses	(1,619)	(1,645)
12 months or more, Fair Value	129,356	76,499
Total Unrealized Gross Losses	(2,240)	(1,786)
Total, Fair Value	213,457	114,064
Equity securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Unrealized Gross Losses		(12)
Less than 12 months, Fair Value		488
12 months or more, Unrealized Gross Losses		0
12 months or more, Fair Value		0
Total Unrealized Gross Losses		(12)
Total, Fair Value		488
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Unrealized Gross Losses	(418)	(28,748)
Less than 12 months, Fair Value	160,772	1,035,754
12 months or more, Unrealized Gross Losses	(25,925)	(61,669)
12 months or more, Fair Value	1,621,708	1,183,017
Total Unrealized Gross Losses	(26,343)	(90,417)
Total, Fair Value	$ 1,782,480	$ 2,218,771

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities - Summary of Fair Value, Notional Amount and Balance Sheet Classification (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Other assets
Derivatives, Fair Value [Line Items]
Notional amount	$ 1,098,666	$ 1,193,323
Derivative Assets, Fair Value	8,422	38,838
Other liabilities
Derivatives, Fair Value [Line Items]
Notional amount	494,311	395,396
Derivative Liabilities, Fair Value	2,916	12,731
Client swap program | Other assets
Derivatives, Fair Value [Line Items]
Notional amount	398,666	395,396
Derivative Assets, Fair Value	2,822	12,731
Client swap program | Other liabilities
Derivatives, Fair Value [Line Items]
Notional amount	398,666	395,396
Derivative Liabilities, Fair Value	2,822	12,731
Commercial loan fair value hedges | Other assets
Derivatives, Fair Value [Line Items]
Notional amount	0	97,927
Derivative Assets, Fair Value	0	3,857
Commercial loan fair value hedges | Other liabilities
Derivatives, Fair Value [Line Items]
Notional amount	95,645	0
Derivative Liabilities, Fair Value	94	0
Borrowings cash flow hedges | Other assets
Derivatives, Fair Value [Line Items]
Notional amount	700,000	700,000
Derivative Assets, Fair Value	5,600	22,250
Borrowings cash flow hedges | Other liabilities
Derivatives, Fair Value [Line Items]
Notional amount	0	0
Derivative Liabilities, Fair Value	$ 0	$ 0

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities - Impact of Fair Value Hedge Accounting on the Carrying Value of the Hedged Items (Details) - Commercial loan fair value hedges $ in Thousands	Mar. 31, 2019USD ($)
Derivatives, Fair Value [Line Items]
Carrying value of hedged items	$ 95,770
Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items	(94)
Loans receivable
Derivatives, Fair Value [Line Items]
Carrying value of hedged items	95,770
Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items	$ (94)

Derivatives and Hedging Activ_5

Derivatives and Hedging Activities - Additional Information (Details)	6 Months Ended
	Mar. 31, 2019
Minimum
Derivative [Line Items]
Derivative, maturities	1 year
Maximum
Derivative [Line Items]
Derivative, maturities	7 years
Weighted average
Derivative [Line Items]
Derivative, maturities	3 years 1 month 18 days

Derivatives and Hedging Activ_6

Derivatives and Hedging Activities - Impact of Derivative Instruments on AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Derivative [Line Items]
Amount of gain/(loss) recognized in AOCI on derivatives in cash flow hedging relationships	$ (6,150)	$ 10,332	$ (16,650)	$ 17,022
Pay fixed/receive floating swap
Derivative [Line Items]
Amount of gain/(loss) recognized in AOCI on derivatives in cash flow hedging relationships	$ (6,150)		$ (16,650)

Derivatives and Hedging Activ_7

Derivatives and Hedging Activities - Gains/(Losses) on Derivative Instruments in Fair Value and Cash Flow Accounting Hedging Relationships (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Interest income/expense, including the effects of fair value and cash flow hedges	$ 141,061	$ 126,529	$ 278,126	$ 251,040
Interest income/expense, including the effects of fair value and cash flow hedges	17,846	$ 15,364	34,737	$ 30,771
Interest rate contracts | Interest income on loans receivable | Fair value hedging
Gain/(loss) on fair value hedging relationships:
Amounts related to interest settlements on derivatives	58		77
Recognized on derivatives	(1,600)		(3,917)
Recognized on hedged items	1,602		3,881
Net income/(expense) recognized on fair value hedges	60		41
Interest rate contracts | Interest expense on FHLB advances | Cash flow hedging
Gain/(loss) on cash flow hedging relationships:
Amounts related to interest settlements on derivatives	(854)		(1,404)
Amount of derivative gain/(loss) reclassified from AOCI into interest income/expense	0		0
Net income/(expense) recognized on cash flow hedges	$ (854)		$ (1,404)

Derivatives and Hedging Activ_8

Derivatives and Hedging Activities - Impact of Client Swap Program that are Not Designated in Accounting Hedges (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2019
Client swap program
Derivative [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	$ 0	$ 0
Other noninterest income | Pay fixed/receive floating swap
Derivative [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	(6,163)	(15,553)
Other noninterest income | Receive fixed/pay floating swap
Derivative [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	$ 6,163	$ 15,553

Revenue from Contracts with C_2

Revenue from Contracts with Customers - Additional Information (Details)	6 Months Ended
	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenue streams percentage, contract with customer	5.00%

Uncategorized Items - wfsl-2019

Label	Element	Value
Accounting Standards Update 2018-02 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 0
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0
Accounting Standards Update 2018-02 [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	(1,772,000)
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	(1,772,000)
Accounting Standards Update 2018-02 [Member] | AOCI Attributable to Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	1,772,000
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 1,772,000